| Message ID | Pine.LNX.4.64.1404261404030.21367@axis700.grange (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Guennadi, On 26 April 2014 13:06, Guennadi wrote: > Subject: [PATCH v2] mmc: add a driver for the Renesas usdhi6rol0 SD/SDIO > host controller > > This patch adds a driver for the Renesas usdhi6rol0 SD/SDIO host controller > in both PIO and DMA modes. ... > +static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + > + if (!host->dma_active) > + return; > + > + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); > + host->dma_active = false; > + > + if (data->flags & MMC_DATA_READ) > + /* TODO: do we have to synchronise? */ > + dma_unmap_sg(host->chan_rx->device->dev, data->sg, > + data->sg_len, DMA_FROM_DEVICE); Yes, you have to sync, so you can remove this TODO comment. ... > +static int usdhi6_probe(struct platform_device *pdev) > +{ ... > + host = mmc_priv(mmc); > + host->mmc = mmc; > + host->wait = USDHI6_WAIT_FOR_REQUEST; > + host->timeout = msecs_to_jiffies(1000); In all places you use host->timeout, the code uses host->timeout * 4. Wouldn't it better to just set it here to 4 seconds? Thanks Phil -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Phil, Thanks for the comments. On Mon, 28 Apr 2014, Phil Edworthy wrote: > Hi Guennadi, > > On 26 April 2014 13:06, Guennadi wrote: > > Subject: [PATCH v2] mmc: add a driver for the Renesas usdhi6rol0 SD/SDIO > > host controller > > > > This patch adds a driver for the Renesas usdhi6rol0 SD/SDIO host controller > > in both PIO and DMA modes. > > ... > > +static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) > > +{ > > + struct mmc_data *data = host->mrq->data; > > + > > + if (!host->dma_active) > > + return; > > + > > + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); > > + host->dma_active = false; > > + > > + if (data->flags & MMC_DATA_READ) > > + /* TODO: do we have to synchronise? */ > > + dma_unmap_sg(host->chan_rx->device->dev, data->sg, > > + data->sg_len, DMA_FROM_DEVICE); > Yes, you have to sync, so you can remove this TODO comment. Why do you think so? If we really do, we'd have to add it. And I did think synchronisation was needed, that's why I posted this patch series: http://thread.gmane.org/gmane.linux.kernel.mmc/24969 but it never got applied, even though it got 2 acks. And actually now I think that synchronisation isn't needed. I think dma_map_sg() / dma_unmap_sg() do that for us already. E.g. dma_map_sg_attrs() arm_dma_map_page() __dma_page_cpu_to_dev() dmac_map_area() cpu_cache.dma_map_area() v7_dma_inv_range() v7_dma_clean_range() Similar for unmapping. So, I think it would be best to remove the comment without adding synchronisation. Let me do this: I'll prepare a separate patch for adding dma syncs, but I won't submit it for now, or I can just provide it for reference. > ... > > +static int usdhi6_probe(struct platform_device *pdev) > > +{ > ... > > + host = mmc_priv(mmc); > > + host->mmc = mmc; > > + host->wait = USDHI6_WAIT_FOR_REQUEST; > > + host->timeout = msecs_to_jiffies(1000); > In all places you use host->timeout, the code uses host->timeout * 4. > Wouldn't it better to just set it here to 4 seconds? ok, I'll do that for v3. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Guennadi, On 03 May 2014 10:09, Guennadi wrote: > On Mon, 28 Apr 2014, Phil Edworthy wrote: > > > Hi Guennadi, > > > > On 26 April 2014 13:06, Guennadi wrote: > > > Subject: [PATCH v2] mmc: add a driver for the Renesas usdhi6rol0 > SD/SDIO > > > host controller > > > > > > This patch adds a driver for the Renesas usdhi6rol0 SD/SDIO host > controller > > > in both PIO and DMA modes. > > > > ... > > > +static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) > > > +{ > > > + struct mmc_data *data = host->mrq->data; > > > + > > > + if (!host->dma_active) > > > + return; > > > + > > > + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); > > > + host->dma_active = false; > > > + > > > + if (data->flags & MMC_DATA_READ) > > > + /* TODO: do we have to synchronise? */ > > > + dma_unmap_sg(host->chan_rx->device->dev, data->sg, > > > + data->sg_len, DMA_FROM_DEVICE); > > Yes, you have to sync, so you can remove this TODO comment. > > Why do you think so? If we really do, we'd have to add it. And I did think > synchronisation was needed, that's why I posted this patch series: > > http://thread.gmane.org/gmane.linux.kernel.mmc/24969 > > but it never got applied, even though it got 2 acks. And actually now I > think that synchronisation isn't needed. I think dma_map_sg() / > dma_unmap_sg() do that for us already. E.g. > > dma_map_sg_attrs() > arm_dma_map_page() > __dma_page_cpu_to_dev() > dmac_map_area() > cpu_cache.dma_map_area() > v7_dma_inv_range() > v7_dma_clean_range() > > Similar for unmapping. So, I think it would be best to remove the comment > without adding synchronisation. > > Let me do this: I'll prepare a separate patch for adding dma syncs, but I > won't submit it for now, or I can just provide it for reference. Ok, my comment was based on the fact that your above patches got acks... Based on your comments above, I think it's best just to remove the TODO comment. > > ... > > > +static int usdhi6_probe(struct platform_device *pdev) > > > +{ > > ... > > > + host = mmc_priv(mmc); > > > + host->mmc = mmc; > > > + host->wait = USDHI6_WAIT_FOR_REQUEST; > > > + host->timeout = msecs_to_jiffies(1000); > > > In all places you use host->timeout, the code uses host->timeout * 4. > > Wouldn't it better to just set it here to 4 seconds? > > ok, I'll do that for v3. > > Thanks > Guennadi Thanks Phil -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Chris, What's the status of this patch? Would be great to get it in for 3.16. Thanks Guennadi On Sat, 26 Apr 2014, Guennadi Liakhovetski wrote: > This patch adds a driver for the Renesas usdhi6rol0 SD/SDIO host controller > in both PIO and DMA modes. > > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> > --- > > v2: copyright and Sob email changed > > .../devicetree/bindings/mmc/usdhi6rol0.txt | 33 + > drivers/mmc/host/Kconfig | 6 + > drivers/mmc/host/Makefile | 1 + > drivers/mmc/host/usdhi6rol0.c | 1834 ++++++++++++++++++++ > 4 files changed, 1874 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mmc/usdhi6rol0.txt > create mode 100644 drivers/mmc/host/usdhi6rol0.c > > diff --git a/Documentation/devicetree/bindings/mmc/usdhi6rol0.txt b/Documentation/devicetree/bindings/mmc/usdhi6rol0.txt > new file mode 100644 > index 0000000..8babdaa > --- /dev/null > +++ b/Documentation/devicetree/bindings/mmc/usdhi6rol0.txt > @@ -0,0 +1,33 @@ > +* Renesas usdhi6rol0 SD/SDIO host controller > + > +Required properties: > + > +- compatible: must be > + "renesas,usdhi6rol0" > +- interrupts: 3 interrupts, named "card detect", "data" and "SDIO" must be > + specified > +- clocks: a clock binding for the IMCLK input > + > +Optional properties: > + > +- vmmc-supply: a phandle of a regulator, supplying Vcc to the card > +- vqmmc-supply: a phandle of a regulator, supplying VccQ to the card > + > +Additionally any standard mmc bindings from mmc.txt can be used. > + > +Example: > + > +sd0: sd@ab000000 { > + compatible = "renesas,usdhi6rol0"; > + reg = <0xab000000 0x200>; > + interrupts = <0 23 0x4 > + 0 24 0x4 > + 0 25 0x4>; > + interrupt-names = "card detect", "data", "SDIO"; > + bus-width = <4>; > + max-frequency = <50000000>; > + cap-power-off-card; > + clocks = <&imclk>; > + vmmc-supply = <&vcc_sd0>; > + vqmmc-supply = <&vccq_sd0>; > +}; > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig > index 8aaf8c1..a21d8b5 100644 > --- a/drivers/mmc/host/Kconfig > +++ b/drivers/mmc/host/Kconfig > @@ -688,6 +688,12 @@ config MMC_WMT > To compile this driver as a module, choose M here: the > module will be called wmt-sdmmc. > > +config MMC_USDHI6ROL0 > + tristate "Renesas USDHI6ROL0 SD/SDIO Host Controller support" > + help > + This selects support for the Renesas USDHI6ROL0 SD/SDIO > + Host Controller > + > config MMC_REALTEK_PCI > tristate "Realtek PCI-E SD/MMC Card Interface Driver" > depends on MFD_RTSX_PCI > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile > index 0c8aa5e..28d1fa0 100644 > --- a/drivers/mmc/host/Makefile > +++ b/drivers/mmc/host/Makefile > @@ -50,6 +50,7 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o > obj-$(CONFIG_MMC_VUB300) += vub300.o > obj-$(CONFIG_MMC_USHC) += ushc.o > obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o > +obj-$(CONFIG_MMC_USDHI6ROL0) += usdhi6rol0.o > > obj-$(CONFIG_MMC_REALTEK_PCI) += rtsx_pci_sdmmc.o > > diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c > new file mode 100644 > index 0000000..261b245 > --- /dev/null > +++ b/drivers/mmc/host/usdhi6rol0.c > @@ -0,0 +1,1834 @@ > +/* > + * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd. > + * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of version 2 of the GNU General Public License as > + * published by the Free Software Foundation. > + */ > + > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/device.h> > +#include <linux/dma-mapping.h> > +#include <linux/dmaengine.h> > +#include <linux/highmem.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/log2.h> > +#include <linux/mmc/host.h> > +#include <linux/mmc/mmc.h> > +#include <linux/mmc/sd.h> > +#include <linux/mmc/sdio.h> > +#include <linux/module.h> > +#include <linux/pagemap.h> > +#include <linux/platform_device.h> > +#include <linux/scatterlist.h> > +#include <linux/string.h> > +#include <linux/time.h> > +#include <linux/virtio.h> > +#include <linux/workqueue.h> > + > +#define USDHI6_SD_CMD 0x0000 > +#define USDHI6_SD_PORT_SEL 0x0004 > +#define USDHI6_SD_ARG 0x0008 > +#define USDHI6_SD_STOP 0x0010 > +#define USDHI6_SD_SECCNT 0x0014 > +#define USDHI6_SD_RSP10 0x0018 > +#define USDHI6_SD_RSP32 0x0020 > +#define USDHI6_SD_RSP54 0x0028 > +#define USDHI6_SD_RSP76 0x0030 > +#define USDHI6_SD_INFO1 0x0038 > +#define USDHI6_SD_INFO2 0x003c > +#define USDHI6_SD_INFO1_MASK 0x0040 > +#define USDHI6_SD_INFO2_MASK 0x0044 > +#define USDHI6_SD_CLK_CTRL 0x0048 > +#define USDHI6_SD_SIZE 0x004c > +#define USDHI6_SD_OPTION 0x0050 > +#define USDHI6_SD_ERR_STS1 0x0058 > +#define USDHI6_SD_ERR_STS2 0x005c > +#define USDHI6_SD_BUF0 0x0060 > +#define USDHI6_SDIO_MODE 0x0068 > +#define USDHI6_SDIO_INFO1 0x006c > +#define USDHI6_SDIO_INFO1_MASK 0x0070 > +#define USDHI6_CC_EXT_MODE 0x01b0 > +#define USDHI6_SOFT_RST 0x01c0 > +#define USDHI6_VERSION 0x01c4 > +#define USDHI6_HOST_MODE 0x01c8 > +#define USDHI6_SDIF_MODE 0x01cc > + > +#define USDHI6_SD_CMD_APP 0x0040 > +#define USDHI6_SD_CMD_MODE_RSP_AUTO 0x0000 > +#define USDHI6_SD_CMD_MODE_RSP_NONE 0x0300 > +#define USDHI6_SD_CMD_MODE_RSP_R1 0x0400 /* Also R5, R6, R7 */ > +#define USDHI6_SD_CMD_MODE_RSP_R1B 0x0500 /* R1b */ > +#define USDHI6_SD_CMD_MODE_RSP_R2 0x0600 > +#define USDHI6_SD_CMD_MODE_RSP_R3 0x0700 /* Also R4 */ > +#define USDHI6_SD_CMD_DATA 0x0800 > +#define USDHI6_SD_CMD_READ 0x1000 > +#define USDHI6_SD_CMD_MULTI 0x2000 > +#define USDHI6_SD_CMD_CMD12_AUTO_OFF 0x4000 > + > +#define USDHI6_CC_EXT_MODE_SDRW BIT(1) > + > +#define USDHI6_SD_INFO1_RSP_END BIT(0) > +#define USDHI6_SD_INFO1_ACCESS_END BIT(2) > +#define USDHI6_SD_INFO1_CARD_OUT BIT(3) > +#define USDHI6_SD_INFO1_CARD_IN BIT(4) > +#define USDHI6_SD_INFO1_CD BIT(5) > +#define USDHI6_SD_INFO1_WP BIT(7) > +#define USDHI6_SD_INFO1_D3_CARD_OUT BIT(8) > +#define USDHI6_SD_INFO1_D3_CARD_IN BIT(9) > + > +#define USDHI6_SD_INFO2_CMD_ERR BIT(0) > +#define USDHI6_SD_INFO2_CRC_ERR BIT(1) > +#define USDHI6_SD_INFO2_END_ERR BIT(2) > +#define USDHI6_SD_INFO2_TOUT BIT(3) > +#define USDHI6_SD_INFO2_IWA_ERR BIT(4) > +#define USDHI6_SD_INFO2_IRA_ERR BIT(5) > +#define USDHI6_SD_INFO2_RSP_TOUT BIT(6) > +#define USDHI6_SD_INFO2_SDDAT0 BIT(7) > +#define USDHI6_SD_INFO2_BRE BIT(8) > +#define USDHI6_SD_INFO2_BWE BIT(9) > +#define USDHI6_SD_INFO2_SCLKDIVEN BIT(13) > +#define USDHI6_SD_INFO2_CBSY BIT(14) > +#define USDHI6_SD_INFO2_ILA BIT(15) > + > +#define USDHI6_SD_INFO1_CARD_INSERT (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_D3_CARD_IN) > +#define USDHI6_SD_INFO1_CARD_EJECT (USDHI6_SD_INFO1_CARD_OUT | USDHI6_SD_INFO1_D3_CARD_OUT) > +#define USDHI6_SD_INFO1_CARD (USDHI6_SD_INFO1_CARD_INSERT | USDHI6_SD_INFO1_CARD_EJECT) > +#define USDHI6_SD_INFO1_CARD_CD (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_CARD_OUT) > + > +#define USDHI6_SD_INFO2_ERR (USDHI6_SD_INFO2_CMD_ERR | \ > + USDHI6_SD_INFO2_CRC_ERR | USDHI6_SD_INFO2_END_ERR | \ > + USDHI6_SD_INFO2_TOUT | USDHI6_SD_INFO2_IWA_ERR | \ > + USDHI6_SD_INFO2_IRA_ERR | USDHI6_SD_INFO2_RSP_TOUT | \ > + USDHI6_SD_INFO2_ILA) > + > +#define USDHI6_SD_INFO1_IRQ (USDHI6_SD_INFO1_RSP_END | USDHI6_SD_INFO1_ACCESS_END | \ > + USDHI6_SD_INFO1_CARD) > + > +#define USDHI6_SD_INFO2_IRQ (USDHI6_SD_INFO2_ERR | USDHI6_SD_INFO2_BRE | \ > + USDHI6_SD_INFO2_BWE | 0x0800 | USDHI6_SD_INFO2_ILA) > + > +#define USDHI6_SD_CLK_CTRL_SCLKEN BIT(8) > + > +#define USDHI6_SD_STOP_STP BIT(0) > +#define USDHI6_SD_STOP_SEC BIT(8) > + > +#define USDHI6_SDIO_INFO1_IOIRQ BIT(0) > +#define USDHI6_SDIO_INFO1_EXPUB52 BIT(14) > +#define USDHI6_SDIO_INFO1_EXWT BIT(15) > + > +#define USDHI6_SDIO_INFO1_IRQ (USDHI6_SDIO_INFO1_IOIRQ | 3 | \ > + USDHI6_SDIO_INFO1_EXPUB52 | USDHI6_SDIO_INFO1_EXWT) > + > +#define USDHI6_MIN_DMA 64 > + > +enum usdhi6_wait_for { > + USDHI6_WAIT_FOR_REQUEST, > + USDHI6_WAIT_FOR_CMD, > + USDHI6_WAIT_FOR_MREAD, > + USDHI6_WAIT_FOR_MWRITE, > + USDHI6_WAIT_FOR_READ, > + USDHI6_WAIT_FOR_WRITE, > + USDHI6_WAIT_FOR_DATA_END, > + USDHI6_WAIT_FOR_STOP, > + USDHI6_WAIT_FOR_DMA, > +}; > + > +struct usdhi6_page { > + struct page *page; > + void *mapped; /* mapped page */ > +}; > + > +struct usdhi6_host { > + struct mmc_host *mmc; > + struct mmc_request *mrq; > + void __iomem *base; > + struct clk *clk; > + > + /* SG memory handling */ > + > + /* Common for multiple and single block requests */ > + struct usdhi6_page pg; /* current page from an SG */ > + void *blk_page; /* either a mapped page, or the bounce buffer */ > + size_t offset; /* offset within a page, including sg->offset */ > + > + /* Blocks, crossing a page boundary */ > + size_t head_len; > + struct usdhi6_page head_pg; > + > + /* A bounce buffer for unaligned blocks or blocks, crossing a page boundary */ > + struct scatterlist bounce_sg; > + u8 bounce_buf[512]; > + > + /* Multiple block requests only */ > + struct scatterlist *sg; /* current SG segment */ > + int page_idx; /* page index within an SG segment */ > + > + enum usdhi6_wait_for wait; > + u32 status_mask; > + u32 status2_mask; > + u32 sdio_mask; > + u32 io_error; > + u32 irq_status; > + unsigned long imclk; > + unsigned long rate; > + bool app_cmd; > + > + /* Timeout handling */ > + struct delayed_work timeout_work; > + unsigned long timeout; > + > + /* DMA support */ > + struct dma_chan *chan_rx; > + struct dma_chan *chan_tx; > + bool dma_active; > +}; > + > +/* I/O primitives */ > + > +static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data) > +{ > + iowrite32(data, host->base + reg); > + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, > + host->base, reg, data); > +} > + > +static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data) > +{ > + iowrite16(data, host->base + reg); > + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, > + host->base, reg, data); > +} > + > +static u32 usdhi6_read(struct usdhi6_host *host, u32 reg) > +{ > + u32 data = ioread32(host->base + reg); > + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, > + host->base, reg, data); > + return data; > +} > + > +static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg) > +{ > + u16 data = ioread16(host->base + reg); > + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, > + host->base, reg, data); > + return data; > +} > + > +static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2) > +{ > + host->status_mask = USDHI6_SD_INFO1_IRQ & ~info1; > + host->status2_mask = USDHI6_SD_INFO2_IRQ & ~info2; > + usdhi6_write(host, USDHI6_SD_INFO1_MASK, host->status_mask); > + usdhi6_write(host, USDHI6_SD_INFO2_MASK, host->status2_mask); > +} > + > +static void usdhi6_wait_for_resp(struct usdhi6_host *host) > +{ > + usdhi6_irq_enable(host, USDHI6_SD_INFO1_RSP_END | > + USDHI6_SD_INFO1_ACCESS_END | USDHI6_SD_INFO1_CARD_CD, > + USDHI6_SD_INFO2_ERR); > +} > + > +static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read) > +{ > + usdhi6_irq_enable(host, USDHI6_SD_INFO1_ACCESS_END | > + USDHI6_SD_INFO1_CARD_CD, USDHI6_SD_INFO2_ERR | > + (read ? USDHI6_SD_INFO2_BRE : USDHI6_SD_INFO2_BWE)); > +} > + > +static void usdhi6_only_cd(struct usdhi6_host *host) > +{ > + /* Mask all except card hotplug */ > + usdhi6_irq_enable(host, USDHI6_SD_INFO1_CARD_CD, 0); > +} > + > +static void usdhi6_mask_all(struct usdhi6_host *host) > +{ > + usdhi6_irq_enable(host, 0, 0); > +} > + > +static int usdhi6_error_code(struct usdhi6_host *host) > +{ > + u32 err; > + > + usdhi6_write(host, USDHI6_SD_STOP, USDHI6_SD_STOP_STP); > + > + if (host->io_error & > + (USDHI6_SD_INFO2_RSP_TOUT | USDHI6_SD_INFO2_TOUT)) { > + u32 rsp54 = usdhi6_read(host, USDHI6_SD_RSP54); > + int opc = host->mrq ? host->mrq->cmd->opcode : -1; > + > + err = usdhi6_read(host, USDHI6_SD_ERR_STS2); > + /* Response timeout is often normal, don't spam the log */ > + if (host->wait == USDHI6_WAIT_FOR_CMD) > + dev_dbg(mmc_dev(host->mmc), > + "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", > + err, rsp54, host->wait, opc); > + else > + dev_warn(mmc_dev(host->mmc), > + "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", > + err, rsp54, host->wait, opc); > + return -ETIMEDOUT; > + } > + > + err = usdhi6_read(host, USDHI6_SD_ERR_STS1); > + if (err != 0x2000) > + dev_warn(mmc_dev(host->mmc), "Err sts 0x%x, state %u, CMD%d\n", > + err, host->wait, host->mrq ? host->mrq->cmd->opcode : -1); > + if (host->io_error & USDHI6_SD_INFO2_ILA) > + return -EILSEQ; > + > + return -EIO; > +} > + > +/* Scatter-Gather management */ > + > +/* > + * In PIO mode we have to map each page separately, using kmap(). That way > + * adjacent pages are mapped to non-adjacent virtual addresses. That's why we > + * have to use a bounce buffer for blocks, crossing page boundaries. Such blocks > + * have been observed with an SDIO WiFi card (b43 driver). > + */ > +static void usdhi6_blk_bounce(struct usdhi6_host *host, > + struct scatterlist *sg) > +{ > + struct mmc_data *data = host->mrq->data; > + size_t blk_head = host->head_len; > + > + dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u of %u SG: %ux%u @ 0x%x\n", > + __func__, host->mrq->cmd->opcode, data->sg_len, > + data->blksz, data->blocks, sg->offset); > + > + host->head_pg.page = host->pg.page; > + host->head_pg.mapped = host->pg.mapped; > + host->pg.page = nth_page(host->pg.page, 1); > + host->pg.mapped = kmap(host->pg.page); > + > + host->blk_page = host->bounce_buf; > + host->offset = 0; > + > + if (data->flags & MMC_DATA_READ) > + return; > + > + memcpy(host->bounce_buf, host->head_pg.mapped + PAGE_SIZE - blk_head, > + blk_head); > + memcpy(host->bounce_buf + blk_head, host->pg.mapped, > + data->blksz - blk_head); > +} > + > +/* Only called for multiple block IO */ > +static void usdhi6_sg_prep(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + struct mmc_data *data = mrq->data; > + > + usdhi6_write(host, USDHI6_SD_SECCNT, data->blocks); > + > + host->sg = data->sg; > + /* TODO: if we always map, this is redundant */ > + host->offset = host->sg->offset; > +} > + > +/* Map the first page in an SG segment: common for multiple and single block IO */ > +static void *usdhi6_sg_map(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + struct scatterlist *sg = data->sg_len > 1 ? host->sg : data->sg; > + size_t head = PAGE_SIZE - sg->offset; > + size_t blk_head = head % data->blksz; > + > + WARN(host->pg.page, "%p not properly unmapped!\n", host->pg.page); > + if (WARN(sg_dma_len(sg) % data->blksz, > + "SG size %zd isn't a multiple of block size %zd\n", > + sg_dma_len(sg), data->blksz)) > + return NULL; > + > + host->pg.page = sg_page(sg); > + host->pg.mapped = kmap(host->pg.page); > + host->offset = sg->offset; > + > + /* > + * Block size must be a power of 2 for multi-block transfers, > + * therefore blk_head is equal for all pages in this SG > + */ > + host->head_len = blk_head; > + > + if (head < data->blksz) > + /* > + * The first block in the SG crosses a page boundary. > + * Max blksz = 512, so blocks can only span 2 pages > + */ > + usdhi6_blk_bounce(host, sg); > + else > + host->blk_page = host->pg.mapped; > + > + dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p + %u for CMD%u @ 0x%p\n", > + host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, > + sg->offset, host->mrq->cmd->opcode, host->mrq); > + > + return host->blk_page + host->offset; > +} > + > +/* Unmap the current page: common for multiple and single block IO */ > +static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force) > +{ > + struct mmc_data *data = host->mrq->data; > + struct page *page = host->head_pg.page; > + > + if (page) { > + /* Previous block was cross-page boundary */ > + struct scatterlist *sg = data->sg_len > 1 ? > + host->sg : data->sg; > + size_t blk_head = host->head_len; > + > + if (!data->error && data->flags & MMC_DATA_READ) { > + memcpy(host->head_pg.mapped + PAGE_SIZE - blk_head, > + host->bounce_buf, blk_head); > + memcpy(host->pg.mapped, host->bounce_buf + blk_head, > + data->blksz - blk_head); > + } > + > + flush_dcache_page(page); > + kunmap(page); > + > + host->head_pg.page = NULL; > + > + if (!force && sg_dma_len(sg) + sg->offset > > + (host->page_idx << PAGE_SHIFT) + data->blksz - blk_head) > + /* More blocks in this SG, don't unmap the next page */ > + return; > + } > + > + page = host->pg.page; > + if (!page) > + return; > + > + flush_dcache_page(page); > + kunmap(page); > + > + host->pg.page = NULL; > +} > + > +/* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */ > +static void usdhi6_sg_advance(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + size_t done, total; > + > + /* New offset: set at the end of the previous block */ > + if (host->head_pg.page) { > + /* Finished a cross-page block, jump to the new page */ > + host->page_idx++; > + host->offset = data->blksz - host->head_len; > + host->blk_page = host->pg.mapped; > + usdhi6_sg_unmap(host, false); > + } else { > + host->offset += data->blksz; > + /* The completed block didn't cross a page boundary */ > + if (host->offset == PAGE_SIZE) { > + /* If required, we'll map the page below */ > + host->offset = 0; > + host->page_idx++; > + } > + } > + > + /* > + * Now host->blk_page + host->offset point at the end of our last block > + * and host->page_idx is the index of the page, in which our new block > + * is located, if any > + */ > + > + done = (host->page_idx << PAGE_SHIFT) + host->offset; > + total = host->sg->offset + sg_dma_len(host->sg); > + > + dev_dbg(mmc_dev(host->mmc), "%s(): %zu of %zu @ %u\n", __func__, > + done, total, host->offset); > + > + if (done < total && host->offset) { > + /* More blocks in this page */ > + if (host->offset + data->blksz > PAGE_SIZE) > + /* We approached at a block, that spans 2 pages */ > + usdhi6_blk_bounce(host, host->sg); > + > + return; > + } > + > + /* Finished current page or an SG segment */ > + usdhi6_sg_unmap(host, false); > + > + if (done == total) { > + /* > + * End of an SG segment or the complete SG: jump to the next > + * segment, we'll map it later in usdhi6_blk_read() or > + * usdhi6_blk_write() > + */ > + struct scatterlist *next = sg_next(host->sg); > + > + host->page_idx = 0; > + > + if (!next) > + host->wait = USDHI6_WAIT_FOR_DATA_END; > + host->sg = next; > + > + if (WARN(next && sg_dma_len(next) % data->blksz, > + "SG size %zd isn't a multiple of block size %zd\n", > + sg_dma_len(next), data->blksz)) > + data->error = -EINVAL; > + > + return; > + } > + > + /* We cannot get here after crossing a page border */ > + > + /* Next page in the same SG */ > + host->pg.page = nth_page(sg_page(host->sg), host->page_idx); > + host->pg.mapped = kmap(host->pg.page); > + host->blk_page = host->pg.mapped; > + > + dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p for CMD%u @ 0x%p\n", > + host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, > + host->mrq->cmd->opcode, host->mrq); > +} > + > +/* DMA handling */ > + > +static void usdhi6_dma_release(struct usdhi6_host *host) > +{ > + host->dma_active = false; > + if (host->chan_tx) { > + struct dma_chan *chan = host->chan_tx; > + host->chan_tx = NULL; > + dma_release_channel(chan); > + } > + if (host->chan_rx) { > + struct dma_chan *chan = host->chan_rx; > + host->chan_rx = NULL; > + dma_release_channel(chan); > + } > +} > + > +static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + > + if (!host->dma_active) > + return; > + > + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); > + host->dma_active = false; > + > + if (data->flags & MMC_DATA_READ) > + /* TODO: do we have to synchronise? */ > + dma_unmap_sg(host->chan_rx->device->dev, data->sg, > + data->sg_len, DMA_FROM_DEVICE); > + else > + dma_unmap_sg(host->chan_tx->device->dev, data->sg, > + data->sg_len, DMA_TO_DEVICE); > +} > + > +static void usdhi6_dma_complete(void *arg) > +{ > + struct usdhi6_host *host = arg; > + struct mmc_request *mrq = host->mrq; > + > + if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion for %p!\n", > + dev_name(mmc_dev(host->mmc)), mrq)) > + return; > + > + dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u DMA completed\n", __func__, > + mrq->cmd->opcode); > + > + usdhi6_dma_stop_unmap(host); > + usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); > +} > + > +static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan, > + enum dma_transfer_direction dir) > +{ > + struct mmc_data *data = host->mrq->data; > + struct scatterlist *sg = data->sg; > + struct dma_async_tx_descriptor *desc = NULL; > + dma_cookie_t cookie = -EINVAL; > + enum dma_data_direction data_dir; > + int ret; > + > + switch (dir) { > + case DMA_MEM_TO_DEV: > + data_dir = DMA_TO_DEVICE; > + break; > + case DMA_DEV_TO_MEM: > + data_dir = DMA_FROM_DEVICE; > + break; > + default: > + return -EINVAL; > + } > + > + ret = dma_map_sg(chan->device->dev, sg, data->sg_len, data_dir); > + if (ret > 0) { > + host->dma_active = true; > + desc = dmaengine_prep_slave_sg(chan, sg, ret, dir, > + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); > + } > + > + if (desc) { > + desc->callback = usdhi6_dma_complete; > + desc->callback_param = host; > + cookie = dmaengine_submit(desc); > + } > + > + dev_dbg(mmc_dev(host->mmc), "%s(): mapped %d -> %d, cookie %d @ %p\n", > + __func__, data->sg_len, ret, cookie, desc); > + > + if (cookie < 0) { > + /* DMA failed, fall back to PIO */ > + if (ret >= 0) > + ret = cookie; > + usdhi6_dma_release(host); > + dev_warn(mmc_dev(host->mmc), > + "DMA failed: %d, falling back to PIO\n", ret); > + } > + > + return cookie; > +} > + > +static int usdhi6_dma_start(struct usdhi6_host *host) > +{ > + if (!host->chan_rx || !host->chan_tx) > + return -ENODEV; > + > + if (host->mrq->data->flags & MMC_DATA_READ) > + return usdhi6_dma_setup(host, host->chan_rx, DMA_DEV_TO_MEM); > + > + return usdhi6_dma_setup(host, host->chan_tx, DMA_MEM_TO_DEV); > +} > + > +static void usdhi6_dma_kill(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + > + dev_dbg(mmc_dev(host->mmc), "%s(): SG of %u: %ux%u\n", > + __func__, data->sg_len, data->blocks, data->blksz); > + /* Abort DMA */ > + if (data->flags & MMC_DATA_READ) > + dmaengine_terminate_all(host->chan_rx); > + else > + dmaengine_terminate_all(host->chan_tx); > +} > + > +static void usdhi6_dma_check_error(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + > + dev_dbg(mmc_dev(host->mmc), "%s(): IO error %d, status 0x%x\n", > + __func__, host->io_error, usdhi6_read(host, USDHI6_SD_INFO1)); > + > + if (host->io_error) { > + data->error = usdhi6_error_code(host); > + data->bytes_xfered = 0; > + usdhi6_dma_kill(host); > + usdhi6_dma_release(host); > + dev_warn(mmc_dev(host->mmc), > + "DMA failed: %d, falling back to PIO\n", data->error); > + return; > + } > + > + /* > + * The datasheet tells us to check a response from the card, whereas > + * responses only come after the command phase, not after the data > + * phase. Let's check anyway. > + */ > + if (host->irq_status & USDHI6_SD_INFO1_RSP_END) > + dev_warn(mmc_dev(host->mmc), "Unexpected response received!\n"); > +} > + > +static void usdhi6_dma_kick(struct usdhi6_host *host) > +{ > + if (host->mrq->data->flags & MMC_DATA_READ) > + dma_async_issue_pending(host->chan_rx); > + else > + dma_async_issue_pending(host->chan_tx); > +} > + > +static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start) > +{ > + struct dma_slave_config cfg = { > + .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, > + .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, > + }; > + int ret; > + > + host->chan_tx = dma_request_slave_channel(mmc_dev(host->mmc), "tx"); > + dev_dbg(mmc_dev(host->mmc), "%s: TX: got channel %p\n", __func__, > + host->chan_tx); > + > + if (!host->chan_tx) > + return; > + > + cfg.direction = DMA_MEM_TO_DEV; > + cfg.dst_addr = start + USDHI6_SD_BUF0; > + cfg.dst_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ > + cfg.src_addr = 0; > + ret = dmaengine_slave_config(host->chan_tx, &cfg); > + if (ret < 0) > + goto e_release_tx; > + > + host->chan_rx = dma_request_slave_channel(mmc_dev(host->mmc), "rx"); > + dev_dbg(mmc_dev(host->mmc), "%s: RX: got channel %p\n", __func__, > + host->chan_rx); > + > + if (!host->chan_rx) > + goto e_release_tx; > + > + cfg.direction = DMA_DEV_TO_MEM; > + cfg.src_addr = cfg.dst_addr; > + cfg.src_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ > + cfg.dst_addr = 0; > + ret = dmaengine_slave_config(host->chan_rx, &cfg); > + if (ret < 0) > + goto e_release_rx; > + > + return; > + > +e_release_rx: > + dma_release_channel(host->chan_rx); > + host->chan_rx = NULL; > +e_release_tx: > + dma_release_channel(host->chan_tx); > + host->chan_tx = NULL; > +} > + > +/* API helpers */ > + > +static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios) > +{ > + unsigned long rate = ios->clock; > + u32 val; > + unsigned int i; > + > + for (i = 1000; i; i--) { > + if (usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_SCLKDIVEN) > + break; > + usleep_range(10, 100); > + } > + > + if (!i) { > + dev_err(mmc_dev(host->mmc), "SD bus busy, clock set aborted\n"); > + return; > + } > + > + val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & 0xff00; > + > + if (rate) { > + unsigned long new_rate; > + > + if (host->imclk <= rate) { > + if (ios->timing != MMC_TIMING_UHS_DDR50) { > + /* Cannot have 1-to-1 clock in DDR mode */ > + new_rate = host->imclk; > + val |= 0xff; > + } else { > + new_rate = host->imclk / 2; > + } > + } else { > + unsigned long div = > + roundup_pow_of_two(DIV_ROUND_UP(host->imclk, rate)); > + val |= div >> 2; > + new_rate = host->imclk / div; > + } > + > + if (host->rate == new_rate) > + return; > + > + host->rate = new_rate; > + > + dev_dbg(mmc_dev(host->mmc), "target %lu, div %u, set %lu\n", > + rate, (val & 0xff) << 2, new_rate); > + } > + > + /* > + * if old or new rate is equal to input rate, have to switch the clock > + * off before changing and on after > + */ > + if (host->imclk == rate || host->imclk == host->rate || !rate) > + usdhi6_write(host, USDHI6_SD_CLK_CTRL, > + val & ~USDHI6_SD_CLK_CTRL_SCLKEN); > + > + if (!rate) { > + host->rate = 0; > + return; > + } > + > + usdhi6_write(host, USDHI6_SD_CLK_CTRL, val); > + > + if (host->imclk == rate || host->imclk == host->rate || > + !(val & USDHI6_SD_CLK_CTRL_SCLKEN)) > + usdhi6_write(host, USDHI6_SD_CLK_CTRL, > + val | USDHI6_SD_CLK_CTRL_SCLKEN); > +} > + > +static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios) > +{ > + struct mmc_host *mmc = host->mmc; > + > + if (!IS_ERR(mmc->supply.vmmc)) > + /* Errors ignored... */ > + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, > + ios->power_mode ? ios->vdd : 0); > +} > + > +static int usdhi6_reset(struct usdhi6_host *host) > +{ > + int i; > + > + usdhi6_write(host, USDHI6_SOFT_RST, 6); > + cpu_relax(); > + usdhi6_write(host, USDHI6_SOFT_RST, 7); > + for (i = 1000; i; i--) > + if (usdhi6_read(host, USDHI6_SOFT_RST) & 1) > + break; > + > + return i ? 0 : -ETIMEDOUT; > +} > + > +static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > +{ > + struct usdhi6_host *host = mmc_priv(mmc); > + u32 option, mode; > + int ret; > + > + dev_dbg(mmc_dev(mmc), "%uHz, OCR: %u, power %u, bus-width %u, timing %u\n", > + ios->clock, ios->vdd, ios->power_mode, ios->bus_width, ios->timing); > + > + switch (ios->power_mode) { > + case MMC_POWER_OFF: > + usdhi6_set_power(host, ios); > + usdhi6_only_cd(host); > + break; > + case MMC_POWER_UP: > + /* > + * We only also touch USDHI6_SD_OPTION from .request(), which > + * cannot race with MMC_POWER_UP > + */ > + ret = usdhi6_reset(host); > + if (ret < 0) { > + dev_err(mmc_dev(mmc), "Cannot reset the interface!\n"); > + } else { > + usdhi6_set_power(host, ios); > + usdhi6_only_cd(host); > + } > + break; > + case MMC_POWER_ON: > + option = usdhi6_read(host, USDHI6_SD_OPTION); > + /* > + * The eMMC standard only allows 4 or 8 bits in the DDR mode, > + * the same probably holds for SD cards. We check here anyway, > + * since the datasheet explicitly requires 4 bits for DDR. > + */ > + if (ios->bus_width == MMC_BUS_WIDTH_1) { > + if (ios->timing == MMC_TIMING_UHS_DDR50) > + dev_err(mmc_dev(mmc), > + "4 bits are required for DDR\n"); > + option |= 0x8000; > + mode = 0; > + } else { > + option &= 0x7fff; > + mode = ios->timing == MMC_TIMING_UHS_DDR50; > + } > + usdhi6_write(host, USDHI6_SD_OPTION, option); > + usdhi6_write(host, USDHI6_SDIF_MODE, mode); > + break; > + } > + > + if (host->rate != ios->clock) > + usdhi6_clk_set(host, ios); > +} > + > +/* This is data timeout. Response timeout is fixed to 640 clock cycles */ > +static void usdhi6_timeout_set(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + u32 val; > + unsigned long ticks; > + > + if (!mrq->data) > + ticks = host->rate / 1000 * mrq->cmd->busy_timeout; > + else > + ticks = host->rate / 1000000 * (mrq->data->timeout_ns / 1000) + > + mrq->data->timeout_clks; > + > + if (!ticks || ticks > 1 << 27) > + /* Max timeout */ > + val = 14; > + else if (ticks < 1 << 13) > + /* Min timeout */ > + val = 0; > + else > + val = order_base_2(ticks) - 13; > + > + dev_dbg(mmc_dev(host->mmc), "Set %s timeout %lu ticks @ %lu Hz\n", > + mrq->data ? "data" : "cmd", ticks, host->rate); > + > + usdhi6_write(host, USDHI6_SD_OPTION, (val << 4) | > + (usdhi6_read(host, USDHI6_SD_OPTION) & 0xff0f)); > +} > + > +static void usdhi6_request_done(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + struct mmc_data *data = mrq->data; > + > + if (WARN(host->pg.page || host->head_pg.page, > + "Page %p or %p not unmapped: wait %u, CMD%d(%c) @ +0x%x %ux%u in SG%u!\n", > + host->pg.page, host->head_pg.page, host->wait, mrq->cmd->opcode, > + data ? (data->flags & MMC_DATA_READ ? 'R' : 'W') : '-', > + data ? host->offset : 0, data ? data->blocks : 0, > + data ? data->blksz : 0, data ? data->sg_len : 0)) > + usdhi6_sg_unmap(host, true); > + > + if (mrq->cmd->error || > + (data && data->error) || > + (mrq->stop && mrq->stop->error)) > + dev_dbg(mmc_dev(host->mmc), "%s(CMD%d: %ux%u): err %d %d %d\n", > + __func__, mrq->cmd->opcode, data ? data->blocks : 0, > + data ? data->blksz : 0, > + mrq->cmd->error, > + data ? data->error : 1, > + mrq->stop ? mrq->stop->error : 1); > + > + /* Disable DMA */ > + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); > + host->wait = USDHI6_WAIT_FOR_REQUEST; > + host->mrq = NULL; > + > + mmc_request_done(host->mmc, mrq); > +} > + > +static int usdhi6_cmd_flags(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + struct mmc_command *cmd = mrq->cmd; > + u16 opc = cmd->opcode; > + > + if (host->app_cmd) { > + host->app_cmd = false; > + opc |= USDHI6_SD_CMD_APP; > + } > + > + if (mrq->data) { > + opc |= USDHI6_SD_CMD_DATA; > + > + if (mrq->data->flags & MMC_DATA_READ) > + opc |= USDHI6_SD_CMD_READ; > + > + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || > + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || > + (cmd->opcode == SD_IO_RW_EXTENDED && > + mrq->data->blocks > 1)) { > + opc |= USDHI6_SD_CMD_MULTI; > + if (!mrq->stop) > + opc |= USDHI6_SD_CMD_CMD12_AUTO_OFF; > + } > + > + switch (mmc_resp_type(cmd)) { > + case MMC_RSP_NONE: > + opc |= USDHI6_SD_CMD_MODE_RSP_NONE; > + break; > + case MMC_RSP_R1: > + opc |= USDHI6_SD_CMD_MODE_RSP_R1; > + break; > + case MMC_RSP_R1B: > + opc |= USDHI6_SD_CMD_MODE_RSP_R1B; > + break; > + case MMC_RSP_R2: > + opc |= USDHI6_SD_CMD_MODE_RSP_R2; > + break; > + case MMC_RSP_R3: > + opc |= USDHI6_SD_CMD_MODE_RSP_R3; > + break; > + default: > + dev_warn(mmc_dev(host->mmc), > + "Unknown response type %d\n", > + mmc_resp_type(cmd)); > + return -EINVAL; > + } > + } > + > + return opc; > +} > + > +static int usdhi6_rq_start(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + struct mmc_command *cmd = mrq->cmd; > + struct mmc_data *data = mrq->data; > + int opc = usdhi6_cmd_flags(host); > + int i; > + > + if (opc < 0) > + return opc; > + > + for (i = 1000; i; i--) { > + if (!(usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_CBSY)) > + break; > + usleep_range(10, 100); > + } > + > + if (!i) { > + dev_dbg(mmc_dev(host->mmc), "Command active, request aborted\n"); > + return -EAGAIN; > + } > + > + if (data) { > + bool use_dma; > + int ret = 0; > + > + host->page_idx = 0; > + > + if (cmd->opcode == SD_IO_RW_EXTENDED && data->blocks > 1) { > + switch (data->blksz) { > + case 512: > + break; > + case 32: > + case 64: > + case 128: > + case 256: > + if (mrq->stop) > + ret = -EINVAL; > + break; > + default: > + ret = -EINVAL; > + } > + } else if ((cmd->opcode == MMC_READ_MULTIPLE_BLOCK || > + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) && > + data->blksz != 512) { > + ret = -EINVAL; > + } > + > + if (ret < 0) { > + dev_warn(mmc_dev(host->mmc), "%s(): %u blocks of %u bytes\n", > + __func__, data->blocks, data->blksz); > + return -EINVAL; > + } > + > + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || > + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || > + (cmd->opcode == SD_IO_RW_EXTENDED && > + data->blocks > 1)) > + usdhi6_sg_prep(host); > + > + usdhi6_write(host, USDHI6_SD_SIZE, data->blksz); > + > + if ((data->blksz >= USDHI6_MIN_DMA || > + data->blocks > 1) && > + (data->blksz % 4 || > + data->sg->offset % 4)) > + dev_dbg(mmc_dev(host->mmc), > + "Bad SG of %u: %ux%u @ %u\n", data->sg_len, > + data->blksz, data->blocks, data->sg->offset); > + > + /* Enable DMA for USDHI6_MIN_DMA bytes or more */ > + use_dma = data->blksz >= USDHI6_MIN_DMA && > + !(data->blksz % 4) && > + usdhi6_dma_start(host) >= DMA_MIN_COOKIE; > + > + if (use_dma) > + usdhi6_write(host, USDHI6_CC_EXT_MODE, USDHI6_CC_EXT_MODE_SDRW); > + > + dev_dbg(mmc_dev(host->mmc), > + "%s(): request opcode %u, %u blocks of %u bytes in %u segments, %s %s @+0x%x%s\n", > + __func__, cmd->opcode, data->blocks, data->blksz, > + data->sg_len, use_dma ? "DMA" : "PIO", > + data->flags & MMC_DATA_READ ? "read" : "write", > + data->sg->offset, mrq->stop ? " + stop" : ""); > + } else { > + dev_dbg(mmc_dev(host->mmc), "%s(): request opcode %u\n", > + __func__, cmd->opcode); > + } > + > + /* We have to get a command completion interrupt with DMA too */ > + usdhi6_wait_for_resp(host); > + > + host->wait = USDHI6_WAIT_FOR_CMD; > + schedule_delayed_work(&host->timeout_work, host->timeout * 4); > + > + /* SEC bit is required to enable block counting by the core */ > + usdhi6_write(host, USDHI6_SD_STOP, > + data && data->blocks > 1 ? USDHI6_SD_STOP_SEC : 0); > + usdhi6_write(host, USDHI6_SD_ARG, cmd->arg); > + > + /* Kick command execution */ > + usdhi6_write(host, USDHI6_SD_CMD, opc); > + > + return 0; > +} > + > +static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq) > +{ > + struct usdhi6_host *host = mmc_priv(mmc); > + int ret; > + > + cancel_delayed_work_sync(&host->timeout_work); > + > + host->mrq = mrq; > + host->sg = NULL; > + > + usdhi6_timeout_set(host); > + ret = usdhi6_rq_start(host); > + if (ret < 0) { > + mrq->cmd->error = ret; > + usdhi6_request_done(host); > + } > +} > + > +static int usdhi6_get_cd(struct mmc_host *mmc) > +{ > + struct usdhi6_host *host = mmc_priv(mmc); > + /* Read is atomic, no need to lock */ > + u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_CD; > + > +/* > + * level status.CD CD_ACTIVE_HIGH card present > + * 1 0 0 0 > + * 1 0 1 1 > + * 0 1 0 1 > + * 0 1 1 0 > + */ > + return !status ^ !(mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH); > +} > + > +static int usdhi6_get_ro(struct mmc_host *mmc) > +{ > + struct usdhi6_host *host = mmc_priv(mmc); > + /* No locking as above */ > + u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_WP; > + > +/* > + * level status.WP RO_ACTIVE_HIGH card read-only > + * 1 0 0 0 > + * 1 0 1 1 > + * 0 1 0 1 > + * 0 1 1 0 > + */ > + return !status ^ !(mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH); > +} > + > +static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable) > +{ > + struct usdhi6_host *host = mmc_priv(mmc); > + > + dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ? "en" : "dis"); > + > + if (enable) { > + host->sdio_mask = USDHI6_SDIO_INFO1_IRQ & ~USDHI6_SDIO_INFO1_IOIRQ; > + usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, host->sdio_mask); > + usdhi6_write(host, USDHI6_SDIO_MODE, 1); > + } else { > + usdhi6_write(host, USDHI6_SDIO_MODE, 0); > + usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, USDHI6_SDIO_INFO1_IRQ); > + host->sdio_mask = USDHI6_SDIO_INFO1_IRQ; > + } > +} > + > +static struct mmc_host_ops usdhi6_ops = { > + .request = usdhi6_request, > + .set_ios = usdhi6_set_ios, > + .get_cd = usdhi6_get_cd, > + .get_ro = usdhi6_get_ro, > + .enable_sdio_irq = usdhi6_enable_sdio_irq, > +}; > + > +/* State machine handlers */ > + > +static void usdhi6_resp_cmd12(struct usdhi6_host *host) > +{ > + struct mmc_command *cmd = host->mrq->stop; > + cmd->resp[0] = usdhi6_read(host, USDHI6_SD_RSP10); > +} > + > +static void usdhi6_resp_read(struct usdhi6_host *host) > +{ > + struct mmc_command *cmd = host->mrq->cmd; > + u32 *rsp = cmd->resp, tmp = 0; > + int i; > + > +/* > + * RSP10 39-8 > + * RSP32 71-40 > + * RSP54 103-72 > + * RSP76 127-104 > + * R2-type response: > + * resp[0] = r[127..96] > + * resp[1] = r[95..64] > + * resp[2] = r[63..32] > + * resp[3] = r[31..0] > + * Other responses: > + * resp[0] = r[39..8] > + */ > + > + if (mmc_resp_type(cmd) == MMC_RSP_NONE) > + return; > + > + if (!(host->irq_status & USDHI6_SD_INFO1_RSP_END)) { > + dev_err(mmc_dev(host->mmc), > + "CMD%d: response expected but is missing!\n", cmd->opcode); > + return; > + } > + > + if (mmc_resp_type(cmd) & MMC_RSP_136) > + for (i = 0; i < 4; i++) { > + if (i) > + rsp[3 - i] = tmp >> 24; > + tmp = usdhi6_read(host, USDHI6_SD_RSP10 + i * 8); > + rsp[3 - i] |= tmp << 8; > + } > + else if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || > + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) > + /* Read RSP54 to avoid conflict with auto CMD12 */ > + rsp[0] = usdhi6_read(host, USDHI6_SD_RSP54); > + else > + rsp[0] = usdhi6_read(host, USDHI6_SD_RSP10); > + > + dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]); > +} > + > +static int usdhi6_blk_read(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + u32 *p; > + int i, rest; > + > + if (host->io_error) { > + data->error = usdhi6_error_code(host); > + goto error; > + } > + > + if (host->pg.page) { > + p = host->blk_page + host->offset; > + } else { > + p = usdhi6_sg_map(host); > + if (!p) { > + data->error = -ENOMEM; > + goto error; > + } > + } > + > + for (i = 0; i < data->blksz / 4; i++, p++) > + *p = usdhi6_read(host, USDHI6_SD_BUF0); > + > + rest = data->blksz % 4; > + for (i = 0; i < (rest + 1) / 2; i++) { > + u16 d = usdhi6_read16(host, USDHI6_SD_BUF0); > + ((u8 *)p)[2 * i] = ((u8 *)&d)[0]; > + if (rest > 1 && !i) > + ((u8 *)p)[2 * i + 1] = ((u8 *)&d)[1]; > + } > + > + return 0; > + > +error: > + dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); > + host->wait = USDHI6_WAIT_FOR_REQUEST; > + return data->error; > +} > + > +static int usdhi6_blk_write(struct usdhi6_host *host) > +{ > + struct mmc_data *data = host->mrq->data; > + u32 *p; > + int i, rest; > + > + if (host->io_error) { > + data->error = usdhi6_error_code(host); > + goto error; > + } > + > + if (host->pg.page) { > + p = host->blk_page + host->offset; > + } else { > + p = usdhi6_sg_map(host); > + if (!p) { > + data->error = -ENOMEM; > + goto error; > + } > + } > + > + for (i = 0; i < data->blksz / 4; i++, p++) > + usdhi6_write(host, USDHI6_SD_BUF0, *p); > + > + rest = data->blksz % 4; > + for (i = 0; i < (rest + 1) / 2; i++) { > + u16 d; > + ((u8 *)&d)[0] = ((u8 *)p)[2 * i]; > + if (rest > 1 && !i) > + ((u8 *)&d)[1] = ((u8 *)p)[2 * i + 1]; > + else > + ((u8 *)&d)[1] = 0; > + usdhi6_write16(host, USDHI6_SD_BUF0, d); > + } > + > + return 0; > + > +error: > + dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); > + host->wait = USDHI6_WAIT_FOR_REQUEST; > + return data->error; > +} > + > +static int usdhi6_stop_cmd(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + > + switch (mrq->cmd->opcode) { > + case MMC_READ_MULTIPLE_BLOCK: > + case MMC_WRITE_MULTIPLE_BLOCK: > + if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) { > + host->wait = USDHI6_WAIT_FOR_STOP; > + return 0; > + } > + /* Unsupported STOP command */ > + default: > + dev_err(mmc_dev(host->mmc), > + "unsupported stop CMD%d for CMD%d\n", > + mrq->stop->opcode, mrq->cmd->opcode); > + mrq->stop->error = -EOPNOTSUPP; > + } > + > + return -EOPNOTSUPP; > +} > + > +static bool usdhi6_end_cmd(struct usdhi6_host *host) > +{ > + struct mmc_request *mrq = host->mrq; > + struct mmc_command *cmd = mrq->cmd; > + > + if (host->io_error) { > + cmd->error = usdhi6_error_code(host); > + return false; > + } > + > + usdhi6_resp_read(host); > + > + if (!mrq->data) > + return false; > + > + if (host->dma_active) { > + usdhi6_dma_kick(host); > + if (!mrq->stop) > + host->wait = USDHI6_WAIT_FOR_DMA; > + else if (usdhi6_stop_cmd(host) < 0) > + return false; > + } else if (mrq->data->flags & MMC_DATA_READ) { > + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || > + (cmd->opcode == SD_IO_RW_EXTENDED && > + mrq->data->blocks > 1)) > + host->wait = USDHI6_WAIT_FOR_MREAD; > + else > + host->wait = USDHI6_WAIT_FOR_READ; > + } else { > + if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || > + (cmd->opcode == SD_IO_RW_EXTENDED && > + mrq->data->blocks > 1)) > + host->wait = USDHI6_WAIT_FOR_MWRITE; > + else > + host->wait = USDHI6_WAIT_FOR_WRITE; > + } > + > + return true; > +} > + > +static bool usdhi6_read_block(struct usdhi6_host *host) > +{ > + /* ACCESS_END IRQ is already unmasked */ > + int ret = usdhi6_blk_read(host); > + > + /* > + * Have to force unmapping both pages: the single block could have been > + * cross-page, in which case for single-block IO host->page_idx == 0. > + * So, if we don't force, the second page won't be unmapped. > + */ > + usdhi6_sg_unmap(host, true); > + > + if (ret < 0) > + return false; > + > + host->wait = USDHI6_WAIT_FOR_DATA_END; > + return true; > +} > + > +static bool usdhi6_mread_block(struct usdhi6_host *host) > +{ > + int ret = usdhi6_blk_read(host); > + > + if (ret < 0) > + return false; > + > + usdhi6_sg_advance(host); > + > + return !host->mrq->data->error && > + (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); > +} > + > +static bool usdhi6_write_block(struct usdhi6_host *host) > +{ > + int ret = usdhi6_blk_write(host); > + > + /* See comment in usdhi6_read_block() */ > + usdhi6_sg_unmap(host, true); > + > + if (ret < 0) > + return false; > + > + host->wait = USDHI6_WAIT_FOR_DATA_END; > + return true; > +} > + > +static bool usdhi6_mwrite_block(struct usdhi6_host *host) > +{ > + int ret = usdhi6_blk_write(host); > + > + if (ret < 0) > + return false; > + > + usdhi6_sg_advance(host); > + > + return !host->mrq->data->error && > + (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); > +} > + > +/* Interrupt & timeout handlers */ > + > +static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id) > +{ > + struct usdhi6_host *host = dev_id; > + struct mmc_request *mrq; > + struct mmc_command *cmd; > + struct mmc_data *data; > + bool io_wait = false; > + > + cancel_delayed_work_sync(&host->timeout_work); > + > + mrq = host->mrq; > + if (!mrq) > + return IRQ_HANDLED; > + > + cmd = mrq->cmd; > + data = mrq->data; > + > + switch (host->wait) { > + case USDHI6_WAIT_FOR_REQUEST: > + /* We're too late, the timeout has already kicked in */ > + return IRQ_HANDLED; > + case USDHI6_WAIT_FOR_CMD: > + /* Wait for data? */ > + io_wait = usdhi6_end_cmd(host); > + break; > + case USDHI6_WAIT_FOR_MREAD: > + /* Wait for more data? */ > + io_wait = usdhi6_mread_block(host); > + break; > + case USDHI6_WAIT_FOR_READ: > + /* Wait for data end? */ > + io_wait = usdhi6_read_block(host); > + break; > + case USDHI6_WAIT_FOR_MWRITE: > + /* Wait data to write? */ > + io_wait = usdhi6_mwrite_block(host); > + break; > + case USDHI6_WAIT_FOR_WRITE: > + /* Wait for data end? */ > + io_wait = usdhi6_write_block(host); > + break; > + case USDHI6_WAIT_FOR_DMA: > + usdhi6_dma_check_error(host); > + break; > + case USDHI6_WAIT_FOR_STOP: > + usdhi6_write(host, USDHI6_SD_STOP, 0); > + if (host->io_error) { > + int ret = usdhi6_error_code(host); > + if (mrq->stop) > + mrq->stop->error = ret; > + else > + mrq->data->error = ret; > + dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, ret); > + break; > + } > + usdhi6_resp_cmd12(host); > + mrq->stop->error = 0; > + break; > + case USDHI6_WAIT_FOR_DATA_END: > + if (host->io_error) { > + mrq->data->error = usdhi6_error_code(host); > + dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, > + mrq->data->error); > + } > + break; > + default: > + cmd->error = -EFAULT; > + dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); > + usdhi6_request_done(host); > + return IRQ_HANDLED; > + } > + > + if (io_wait) { > + schedule_delayed_work(&host->timeout_work, host->timeout * 4); > + /* Wait for more data or ACCESS_END */ > + if (!host->dma_active) > + usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); > + return IRQ_HANDLED; > + } > + > + if (!cmd->error) { > + if (data) { > + if (!data->error) { > + if (host->wait != USDHI6_WAIT_FOR_STOP && > + host->mrq->stop && > + !host->mrq->stop->error && > + !usdhi6_stop_cmd(host)) { > + /* Sending STOP */ > + usdhi6_wait_for_resp(host); > + > + schedule_delayed_work(&host->timeout_work, > + host->timeout * 4); > + > + return IRQ_HANDLED; > + } > + > + data->bytes_xfered = data->blocks * data->blksz; > + } else { > + /* Data error: might need to unmap the last page */ > + dev_warn(mmc_dev(host->mmc), "%s(): data error %d\n", > + __func__, data->error); > + usdhi6_sg_unmap(host, true); > + } > + } else if (cmd->opcode == MMC_APP_CMD) { > + host->app_cmd = true; > + } > + } > + > + usdhi6_request_done(host); > + > + return IRQ_HANDLED; > +} > + > +static irqreturn_t usdhi6_sd(int irq, void *dev_id) > +{ > + struct usdhi6_host *host = dev_id; > + u16 status, status2, error; > + > + status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & > + ~USDHI6_SD_INFO1_CARD; > + status2 = usdhi6_read(host, USDHI6_SD_INFO2) & ~host->status2_mask; > + > + usdhi6_only_cd(host); > + > + dev_dbg(mmc_dev(host->mmc), > + "IRQ status = 0x%08x, status2 = 0x%08x\n", status, status2); > + > + if (!status && !status2) > + return IRQ_NONE; > + > + error = status2 & USDHI6_SD_INFO2_ERR; > + > + /* Ack / clear interrupts */ > + if (USDHI6_SD_INFO1_IRQ & status) > + usdhi6_write(host, USDHI6_SD_INFO1, > + 0xffff & ~(USDHI6_SD_INFO1_IRQ & status)); > + > + if (USDHI6_SD_INFO2_IRQ & status2) { > + if (error) > + /* In error cases BWE and BRE aren't cleared automatically */ > + status2 |= USDHI6_SD_INFO2_BWE | USDHI6_SD_INFO2_BRE; > + > + usdhi6_write(host, USDHI6_SD_INFO2, > + 0xffff & ~(USDHI6_SD_INFO2_IRQ & status2)); > + } > + > + host->io_error = error; > + host->irq_status = status; > + > + if (error) { > + /* Don't pollute the log with unsupported command timeouts */ > + if (host->wait != USDHI6_WAIT_FOR_CMD || > + error != USDHI6_SD_INFO2_RSP_TOUT) > + dev_warn(mmc_dev(host->mmc), > + "%s(): INFO2 error bits 0x%08x\n", > + __func__, error); > + else > + dev_dbg(mmc_dev(host->mmc), > + "%s(): INFO2 error bits 0x%08x\n", > + __func__, error); > + } > + > + return IRQ_WAKE_THREAD; > +} > + > +static irqreturn_t usdhi6_sdio(int irq, void *dev_id) > +{ > + struct usdhi6_host *host = dev_id; > + u32 status = usdhi6_read(host, USDHI6_SDIO_INFO1) & ~host->sdio_mask; > + > + dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__, status); > + > + if (!status) > + return IRQ_NONE; > + > + usdhi6_write(host, USDHI6_SDIO_INFO1, ~status); > + > + mmc_signal_sdio_irq(host->mmc); > + > + return IRQ_HANDLED; > +} > + > +static irqreturn_t usdhi6_cd(int irq, void *dev_id) > +{ > + struct usdhi6_host *host = dev_id; > + struct mmc_host *mmc = host->mmc; > + u16 status; > + > + /* We're only interested in hotplug events here */ > + status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & > + USDHI6_SD_INFO1_CARD; > + > + if (!status) > + return IRQ_NONE; > + > + /* Ack */ > + usdhi6_write(host, USDHI6_SD_INFO1, !status); > + > + if (!work_pending(&mmc->detect.work) && > + (((status & USDHI6_SD_INFO1_CARD_INSERT) && > + !mmc->card) || > + ((status & USDHI6_SD_INFO1_CARD_EJECT) && > + mmc->card))) > + mmc_detect_change(mmc, msecs_to_jiffies(100)); > + > + return IRQ_HANDLED; > +} > + > +/* > + * Actually this should not be needed, if the built-in timeout works reliably in > + * the both PIO cases and DMA never fails. But if DMA does fail, a timeout > + * handler might be the only way to catch the error. > + */ > +static void usdhi6_timeout_work(struct work_struct *work) > +{ > + struct delayed_work *d = container_of(work, struct delayed_work, work); > + struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work); > + struct mmc_request *mrq = host->mrq; > + struct mmc_data *data = mrq ? mrq->data : NULL; > + > + dev_warn(mmc_dev(host->mmc), > + "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n", > + host->dma_active ? "DMA" : "PIO", > + host->wait, mrq ? mrq->cmd->opcode : -1, > + usdhi6_read(host, USDHI6_SD_INFO1), > + usdhi6_read(host, USDHI6_SD_INFO2), host->irq_status); > + > + if (host->dma_active) { > + usdhi6_dma_kill(host); > + usdhi6_dma_stop_unmap(host); > + } > + > + switch (host->wait) { > + default: > + dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); > + /* mrq can be NULL in this actually impossible case */ > + case USDHI6_WAIT_FOR_CMD: > + usdhi6_error_code(host); > + if (mrq) > + mrq->cmd->error = -ETIMEDOUT; > + break; > + case USDHI6_WAIT_FOR_STOP: > + usdhi6_error_code(host); > + mrq->stop->error = -ETIMEDOUT; > + break; > + case USDHI6_WAIT_FOR_DMA: > + case USDHI6_WAIT_FOR_MREAD: > + case USDHI6_WAIT_FOR_MWRITE: > + case USDHI6_WAIT_FOR_READ: > + case USDHI6_WAIT_FOR_WRITE: > + dev_dbg(mmc_dev(host->mmc), > + "%c: page #%u @ +0x%x %ux%u in SG%u. Current SG %u bytes @ %u\n", > + data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx, > + host->offset, data->blocks, data->blksz, data->sg_len, > + sg_dma_len(host->sg), host->sg->offset); > + usdhi6_sg_unmap(host, true); > + /* > + * If USDHI6_WAIT_FOR_DATA_END times out, we have already unmapped > + * the page > + */ > + case USDHI6_WAIT_FOR_DATA_END: > + usdhi6_error_code(host); > + data->error = -ETIMEDOUT; > + } > + > + if (mrq) > + usdhi6_request_done(host); > +} > + > +/* Probe / release */ > + > +static const struct of_device_id usdhi6_of_match[] = { > + {.compatible = "renesas,usdhi6rol0"}, > + {} > +}; > +MODULE_DEVICE_TABLE(of, usdhi6_of_match); > + > +static int usdhi6_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct mmc_host *mmc; > + struct usdhi6_host *host; > + struct resource *res; > + int irq_cd, irq_sd, irq_sdio; > + u32 version; > + int ret; > + > + if (!dev->of_node) > + return -ENODEV; > + > + irq_cd = platform_get_irq_byname(pdev, "card detect"); > + irq_sd = platform_get_irq_byname(pdev, "data"); > + irq_sdio = platform_get_irq_byname(pdev, "SDIO"); > + if (irq_sd < 0 || irq_sdio < 0) > + return -ENODEV; > + > + mmc = mmc_alloc_host(sizeof(struct usdhi6_host), dev); > + if (!mmc) > + return -ENOMEM; > + > + ret = mmc_of_parse(mmc); > + if (ret < 0) > + goto e_free_mmc; > + > + mmc_regulator_get_supply(mmc); > + > + host = mmc_priv(mmc); > + host->mmc = mmc; > + host->wait = USDHI6_WAIT_FOR_REQUEST; > + host->timeout = msecs_to_jiffies(1000); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + host->base = devm_ioremap_resource(dev, res); > + if (IS_ERR(host->base)) { > + ret = PTR_ERR(host->base); > + goto e_free_mmc; > + } > + > + host->clk = devm_clk_get(dev, NULL); > + if (IS_ERR(host->clk)) > + goto e_free_mmc; > + > + host->imclk = clk_get_rate(host->clk); > + > + ret = clk_prepare_enable(host->clk); > + if (ret < 0) > + goto e_free_mmc; > + > + version = usdhi6_read(host, USDHI6_VERSION); > + if ((version & 0xfff) != 0xa0d) { > + dev_err(dev, "Version not recognized %x\n", version); > + goto e_clk_off; > + } > + > + dev_info(dev, "A USDHI6ROL0 SD host detected with %d ports\n", > + usdhi6_read(host, USDHI6_SD_PORT_SEL) >> 8); > + > + usdhi6_mask_all(host); > + > + if (irq_cd >= 0) { > + ret = devm_request_irq(dev, irq_cd, usdhi6_cd, 0, > + dev_name(dev), host); > + if (ret < 0) > + goto e_clk_off; > + } else { > + mmc->caps |= MMC_CAP_NEEDS_POLL; > + } > + > + ret = devm_request_threaded_irq(dev, irq_sd, usdhi6_sd, usdhi6_sd_bh, 0, > + dev_name(dev), host); > + if (ret < 0) > + goto e_clk_off; > + > + ret = devm_request_irq(dev, irq_sdio, usdhi6_sdio, 0, > + dev_name(dev), host); > + if (ret < 0) > + goto e_clk_off; > + > + INIT_DELAYED_WORK(&host->timeout_work, usdhi6_timeout_work); > + > + usdhi6_dma_request(host, res->start); > + > + mmc->ops = &usdhi6_ops; > + mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | > + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_DDR50 | MMC_CAP_SDIO_IRQ; > + /* Set .max_segs to some random number. Feel free to adjust. */ > + mmc->max_segs = 32; > + mmc->max_blk_size = 512; > + mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs; > + mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; > + /* > + * Setting .max_seg_size to 1 page would simplify our page-mapping code, > + * But OTOH, having large segments makes DMA more efficient. We could > + * check, whether we managed to get DMA and fall back to 1 page > + * segments, but if we do manage to obtain DMA and then it fails at > + * run-time and we fall back to PIO, we will continue getting large > + * segments. So, we wouldn't be able to get rid of the code anyway. > + */ > + mmc->max_seg_size = mmc->max_req_size; > + if (!mmc->f_max) > + mmc->f_max = host->imclk; > + mmc->f_min = host->imclk / 512; > + > + platform_set_drvdata(pdev, host); > + > + ret = mmc_add_host(mmc); > + if (ret < 0) > + goto e_clk_off; > + > + return 0; > + > +e_clk_off: > + clk_disable_unprepare(host->clk); > +e_free_mmc: > + mmc_free_host(mmc); > + > + return ret; > +} > + > +static int usdhi6_remove(struct platform_device *pdev) > +{ > + struct usdhi6_host *host = platform_get_drvdata(pdev); > + > + mmc_remove_host(host->mmc); > + > + usdhi6_mask_all(host); > + cancel_delayed_work_sync(&host->timeout_work); > + usdhi6_dma_release(host); > + clk_disable_unprepare(host->clk); > + mmc_free_host(host->mmc); > + > + return 0; > +} > + > +static struct platform_driver usdhi6_driver = { > + .probe = usdhi6_probe, > + .remove = usdhi6_remove, > + .driver = { > + .name = "usdhi6rol0", > + .owner = THIS_MODULE, > + .of_match_table = usdhi6_of_match, > + }, > +}; > + > +module_platform_driver(usdhi6_driver); > + > +MODULE_DESCRIPTION("Renesas usdhi6rol0 SD/SDIO host driver"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:usdhi6rol0"); > +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); > -- > 1.9.2 > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/mmc/usdhi6rol0.txt b/Documentation/devicetree/bindings/mmc/usdhi6rol0.txt new file mode 100644 index 0000000..8babdaa --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/usdhi6rol0.txt @@ -0,0 +1,33 @@ +* Renesas usdhi6rol0 SD/SDIO host controller + +Required properties: + +- compatible: must be + "renesas,usdhi6rol0" +- interrupts: 3 interrupts, named "card detect", "data" and "SDIO" must be + specified +- clocks: a clock binding for the IMCLK input + +Optional properties: + +- vmmc-supply: a phandle of a regulator, supplying Vcc to the card +- vqmmc-supply: a phandle of a regulator, supplying VccQ to the card + +Additionally any standard mmc bindings from mmc.txt can be used. + +Example: + +sd0: sd@ab000000 { + compatible = "renesas,usdhi6rol0"; + reg = <0xab000000 0x200>; + interrupts = <0 23 0x4 + 0 24 0x4 + 0 25 0x4>; + interrupt-names = "card detect", "data", "SDIO"; + bus-width = <4>; + max-frequency = <50000000>; + cap-power-off-card; + clocks = <&imclk>; + vmmc-supply = <&vcc_sd0>; + vqmmc-supply = <&vccq_sd0>; +}; diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 8aaf8c1..a21d8b5 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -688,6 +688,12 @@ config MMC_WMT To compile this driver as a module, choose M here: the module will be called wmt-sdmmc. +config MMC_USDHI6ROL0 + tristate "Renesas USDHI6ROL0 SD/SDIO Host Controller support" + help + This selects support for the Renesas USDHI6ROL0 SD/SDIO + Host Controller + config MMC_REALTEK_PCI tristate "Realtek PCI-E SD/MMC Card Interface Driver" depends on MFD_RTSX_PCI diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 0c8aa5e..28d1fa0 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -50,6 +50,7 @@ obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o obj-$(CONFIG_MMC_VUB300) += vub300.o obj-$(CONFIG_MMC_USHC) += ushc.o obj-$(CONFIG_MMC_WMT) += wmt-sdmmc.o +obj-$(CONFIG_MMC_USDHI6ROL0) += usdhi6rol0.o obj-$(CONFIG_MMC_REALTEK_PCI) += rtsx_pci_sdmmc.o diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c new file mode 100644 index 0000000..261b245 --- /dev/null +++ b/drivers/mmc/host/usdhi6rol0.c @@ -0,0 +1,1834 @@ +/* + * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd. + * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/highmem.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/log2.h> +#include <linux/mmc/host.h> +#include <linux/mmc/mmc.h> +#include <linux/mmc/sd.h> +#include <linux/mmc/sdio.h> +#include <linux/module.h> +#include <linux/pagemap.h> +#include <linux/platform_device.h> +#include <linux/scatterlist.h> +#include <linux/string.h> +#include <linux/time.h> +#include <linux/virtio.h> +#include <linux/workqueue.h> + +#define USDHI6_SD_CMD 0x0000 +#define USDHI6_SD_PORT_SEL 0x0004 +#define USDHI6_SD_ARG 0x0008 +#define USDHI6_SD_STOP 0x0010 +#define USDHI6_SD_SECCNT 0x0014 +#define USDHI6_SD_RSP10 0x0018 +#define USDHI6_SD_RSP32 0x0020 +#define USDHI6_SD_RSP54 0x0028 +#define USDHI6_SD_RSP76 0x0030 +#define USDHI6_SD_INFO1 0x0038 +#define USDHI6_SD_INFO2 0x003c +#define USDHI6_SD_INFO1_MASK 0x0040 +#define USDHI6_SD_INFO2_MASK 0x0044 +#define USDHI6_SD_CLK_CTRL 0x0048 +#define USDHI6_SD_SIZE 0x004c +#define USDHI6_SD_OPTION 0x0050 +#define USDHI6_SD_ERR_STS1 0x0058 +#define USDHI6_SD_ERR_STS2 0x005c +#define USDHI6_SD_BUF0 0x0060 +#define USDHI6_SDIO_MODE 0x0068 +#define USDHI6_SDIO_INFO1 0x006c +#define USDHI6_SDIO_INFO1_MASK 0x0070 +#define USDHI6_CC_EXT_MODE 0x01b0 +#define USDHI6_SOFT_RST 0x01c0 +#define USDHI6_VERSION 0x01c4 +#define USDHI6_HOST_MODE 0x01c8 +#define USDHI6_SDIF_MODE 0x01cc + +#define USDHI6_SD_CMD_APP 0x0040 +#define USDHI6_SD_CMD_MODE_RSP_AUTO 0x0000 +#define USDHI6_SD_CMD_MODE_RSP_NONE 0x0300 +#define USDHI6_SD_CMD_MODE_RSP_R1 0x0400 /* Also R5, R6, R7 */ +#define USDHI6_SD_CMD_MODE_RSP_R1B 0x0500 /* R1b */ +#define USDHI6_SD_CMD_MODE_RSP_R2 0x0600 +#define USDHI6_SD_CMD_MODE_RSP_R3 0x0700 /* Also R4 */ +#define USDHI6_SD_CMD_DATA 0x0800 +#define USDHI6_SD_CMD_READ 0x1000 +#define USDHI6_SD_CMD_MULTI 0x2000 +#define USDHI6_SD_CMD_CMD12_AUTO_OFF 0x4000 + +#define USDHI6_CC_EXT_MODE_SDRW BIT(1) + +#define USDHI6_SD_INFO1_RSP_END BIT(0) +#define USDHI6_SD_INFO1_ACCESS_END BIT(2) +#define USDHI6_SD_INFO1_CARD_OUT BIT(3) +#define USDHI6_SD_INFO1_CARD_IN BIT(4) +#define USDHI6_SD_INFO1_CD BIT(5) +#define USDHI6_SD_INFO1_WP BIT(7) +#define USDHI6_SD_INFO1_D3_CARD_OUT BIT(8) +#define USDHI6_SD_INFO1_D3_CARD_IN BIT(9) + +#define USDHI6_SD_INFO2_CMD_ERR BIT(0) +#define USDHI6_SD_INFO2_CRC_ERR BIT(1) +#define USDHI6_SD_INFO2_END_ERR BIT(2) +#define USDHI6_SD_INFO2_TOUT BIT(3) +#define USDHI6_SD_INFO2_IWA_ERR BIT(4) +#define USDHI6_SD_INFO2_IRA_ERR BIT(5) +#define USDHI6_SD_INFO2_RSP_TOUT BIT(6) +#define USDHI6_SD_INFO2_SDDAT0 BIT(7) +#define USDHI6_SD_INFO2_BRE BIT(8) +#define USDHI6_SD_INFO2_BWE BIT(9) +#define USDHI6_SD_INFO2_SCLKDIVEN BIT(13) +#define USDHI6_SD_INFO2_CBSY BIT(14) +#define USDHI6_SD_INFO2_ILA BIT(15) + +#define USDHI6_SD_INFO1_CARD_INSERT (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_D3_CARD_IN) +#define USDHI6_SD_INFO1_CARD_EJECT (USDHI6_SD_INFO1_CARD_OUT | USDHI6_SD_INFO1_D3_CARD_OUT) +#define USDHI6_SD_INFO1_CARD (USDHI6_SD_INFO1_CARD_INSERT | USDHI6_SD_INFO1_CARD_EJECT) +#define USDHI6_SD_INFO1_CARD_CD (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_CARD_OUT) + +#define USDHI6_SD_INFO2_ERR (USDHI6_SD_INFO2_CMD_ERR | \ + USDHI6_SD_INFO2_CRC_ERR | USDHI6_SD_INFO2_END_ERR | \ + USDHI6_SD_INFO2_TOUT | USDHI6_SD_INFO2_IWA_ERR | \ + USDHI6_SD_INFO2_IRA_ERR | USDHI6_SD_INFO2_RSP_TOUT | \ + USDHI6_SD_INFO2_ILA) + +#define USDHI6_SD_INFO1_IRQ (USDHI6_SD_INFO1_RSP_END | USDHI6_SD_INFO1_ACCESS_END | \ + USDHI6_SD_INFO1_CARD) + +#define USDHI6_SD_INFO2_IRQ (USDHI6_SD_INFO2_ERR | USDHI6_SD_INFO2_BRE | \ + USDHI6_SD_INFO2_BWE | 0x0800 | USDHI6_SD_INFO2_ILA) + +#define USDHI6_SD_CLK_CTRL_SCLKEN BIT(8) + +#define USDHI6_SD_STOP_STP BIT(0) +#define USDHI6_SD_STOP_SEC BIT(8) + +#define USDHI6_SDIO_INFO1_IOIRQ BIT(0) +#define USDHI6_SDIO_INFO1_EXPUB52 BIT(14) +#define USDHI6_SDIO_INFO1_EXWT BIT(15) + +#define USDHI6_SDIO_INFO1_IRQ (USDHI6_SDIO_INFO1_IOIRQ | 3 | \ + USDHI6_SDIO_INFO1_EXPUB52 | USDHI6_SDIO_INFO1_EXWT) + +#define USDHI6_MIN_DMA 64 + +enum usdhi6_wait_for { + USDHI6_WAIT_FOR_REQUEST, + USDHI6_WAIT_FOR_CMD, + USDHI6_WAIT_FOR_MREAD, + USDHI6_WAIT_FOR_MWRITE, + USDHI6_WAIT_FOR_READ, + USDHI6_WAIT_FOR_WRITE, + USDHI6_WAIT_FOR_DATA_END, + USDHI6_WAIT_FOR_STOP, + USDHI6_WAIT_FOR_DMA, +}; + +struct usdhi6_page { + struct page *page; + void *mapped; /* mapped page */ +}; + +struct usdhi6_host { + struct mmc_host *mmc; + struct mmc_request *mrq; + void __iomem *base; + struct clk *clk; + + /* SG memory handling */ + + /* Common for multiple and single block requests */ + struct usdhi6_page pg; /* current page from an SG */ + void *blk_page; /* either a mapped page, or the bounce buffer */ + size_t offset; /* offset within a page, including sg->offset */ + + /* Blocks, crossing a page boundary */ + size_t head_len; + struct usdhi6_page head_pg; + + /* A bounce buffer for unaligned blocks or blocks, crossing a page boundary */ + struct scatterlist bounce_sg; + u8 bounce_buf[512]; + + /* Multiple block requests only */ + struct scatterlist *sg; /* current SG segment */ + int page_idx; /* page index within an SG segment */ + + enum usdhi6_wait_for wait; + u32 status_mask; + u32 status2_mask; + u32 sdio_mask; + u32 io_error; + u32 irq_status; + unsigned long imclk; + unsigned long rate; + bool app_cmd; + + /* Timeout handling */ + struct delayed_work timeout_work; + unsigned long timeout; + + /* DMA support */ + struct dma_chan *chan_rx; + struct dma_chan *chan_tx; + bool dma_active; +}; + +/* I/O primitives */ + +static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data) +{ + iowrite32(data, host->base + reg); + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, + host->base, reg, data); +} + +static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data) +{ + iowrite16(data, host->base + reg); + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, + host->base, reg, data); +} + +static u32 usdhi6_read(struct usdhi6_host *host, u32 reg) +{ + u32 data = ioread32(host->base + reg); + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, + host->base, reg, data); + return data; +} + +static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg) +{ + u16 data = ioread16(host->base + reg); + dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, + host->base, reg, data); + return data; +} + +static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2) +{ + host->status_mask = USDHI6_SD_INFO1_IRQ & ~info1; + host->status2_mask = USDHI6_SD_INFO2_IRQ & ~info2; + usdhi6_write(host, USDHI6_SD_INFO1_MASK, host->status_mask); + usdhi6_write(host, USDHI6_SD_INFO2_MASK, host->status2_mask); +} + +static void usdhi6_wait_for_resp(struct usdhi6_host *host) +{ + usdhi6_irq_enable(host, USDHI6_SD_INFO1_RSP_END | + USDHI6_SD_INFO1_ACCESS_END | USDHI6_SD_INFO1_CARD_CD, + USDHI6_SD_INFO2_ERR); +} + +static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read) +{ + usdhi6_irq_enable(host, USDHI6_SD_INFO1_ACCESS_END | + USDHI6_SD_INFO1_CARD_CD, USDHI6_SD_INFO2_ERR | + (read ? USDHI6_SD_INFO2_BRE : USDHI6_SD_INFO2_BWE)); +} + +static void usdhi6_only_cd(struct usdhi6_host *host) +{ + /* Mask all except card hotplug */ + usdhi6_irq_enable(host, USDHI6_SD_INFO1_CARD_CD, 0); +} + +static void usdhi6_mask_all(struct usdhi6_host *host) +{ + usdhi6_irq_enable(host, 0, 0); +} + +static int usdhi6_error_code(struct usdhi6_host *host) +{ + u32 err; + + usdhi6_write(host, USDHI6_SD_STOP, USDHI6_SD_STOP_STP); + + if (host->io_error & + (USDHI6_SD_INFO2_RSP_TOUT | USDHI6_SD_INFO2_TOUT)) { + u32 rsp54 = usdhi6_read(host, USDHI6_SD_RSP54); + int opc = host->mrq ? host->mrq->cmd->opcode : -1; + + err = usdhi6_read(host, USDHI6_SD_ERR_STS2); + /* Response timeout is often normal, don't spam the log */ + if (host->wait == USDHI6_WAIT_FOR_CMD) + dev_dbg(mmc_dev(host->mmc), + "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", + err, rsp54, host->wait, opc); + else + dev_warn(mmc_dev(host->mmc), + "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", + err, rsp54, host->wait, opc); + return -ETIMEDOUT; + } + + err = usdhi6_read(host, USDHI6_SD_ERR_STS1); + if (err != 0x2000) + dev_warn(mmc_dev(host->mmc), "Err sts 0x%x, state %u, CMD%d\n", + err, host->wait, host->mrq ? host->mrq->cmd->opcode : -1); + if (host->io_error & USDHI6_SD_INFO2_ILA) + return -EILSEQ; + + return -EIO; +} + +/* Scatter-Gather management */ + +/* + * In PIO mode we have to map each page separately, using kmap(). That way + * adjacent pages are mapped to non-adjacent virtual addresses. That's why we + * have to use a bounce buffer for blocks, crossing page boundaries. Such blocks + * have been observed with an SDIO WiFi card (b43 driver). + */ +static void usdhi6_blk_bounce(struct usdhi6_host *host, + struct scatterlist *sg) +{ + struct mmc_data *data = host->mrq->data; + size_t blk_head = host->head_len; + + dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u of %u SG: %ux%u @ 0x%x\n", + __func__, host->mrq->cmd->opcode, data->sg_len, + data->blksz, data->blocks, sg->offset); + + host->head_pg.page = host->pg.page; + host->head_pg.mapped = host->pg.mapped; + host->pg.page = nth_page(host->pg.page, 1); + host->pg.mapped = kmap(host->pg.page); + + host->blk_page = host->bounce_buf; + host->offset = 0; + + if (data->flags & MMC_DATA_READ) + return; + + memcpy(host->bounce_buf, host->head_pg.mapped + PAGE_SIZE - blk_head, + blk_head); + memcpy(host->bounce_buf + blk_head, host->pg.mapped, + data->blksz - blk_head); +} + +/* Only called for multiple block IO */ +static void usdhi6_sg_prep(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + struct mmc_data *data = mrq->data; + + usdhi6_write(host, USDHI6_SD_SECCNT, data->blocks); + + host->sg = data->sg; + /* TODO: if we always map, this is redundant */ + host->offset = host->sg->offset; +} + +/* Map the first page in an SG segment: common for multiple and single block IO */ +static void *usdhi6_sg_map(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + struct scatterlist *sg = data->sg_len > 1 ? host->sg : data->sg; + size_t head = PAGE_SIZE - sg->offset; + size_t blk_head = head % data->blksz; + + WARN(host->pg.page, "%p not properly unmapped!\n", host->pg.page); + if (WARN(sg_dma_len(sg) % data->blksz, + "SG size %zd isn't a multiple of block size %zd\n", + sg_dma_len(sg), data->blksz)) + return NULL; + + host->pg.page = sg_page(sg); + host->pg.mapped = kmap(host->pg.page); + host->offset = sg->offset; + + /* + * Block size must be a power of 2 for multi-block transfers, + * therefore blk_head is equal for all pages in this SG + */ + host->head_len = blk_head; + + if (head < data->blksz) + /* + * The first block in the SG crosses a page boundary. + * Max blksz = 512, so blocks can only span 2 pages + */ + usdhi6_blk_bounce(host, sg); + else + host->blk_page = host->pg.mapped; + + dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p + %u for CMD%u @ 0x%p\n", + host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, + sg->offset, host->mrq->cmd->opcode, host->mrq); + + return host->blk_page + host->offset; +} + +/* Unmap the current page: common for multiple and single block IO */ +static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force) +{ + struct mmc_data *data = host->mrq->data; + struct page *page = host->head_pg.page; + + if (page) { + /* Previous block was cross-page boundary */ + struct scatterlist *sg = data->sg_len > 1 ? + host->sg : data->sg; + size_t blk_head = host->head_len; + + if (!data->error && data->flags & MMC_DATA_READ) { + memcpy(host->head_pg.mapped + PAGE_SIZE - blk_head, + host->bounce_buf, blk_head); + memcpy(host->pg.mapped, host->bounce_buf + blk_head, + data->blksz - blk_head); + } + + flush_dcache_page(page); + kunmap(page); + + host->head_pg.page = NULL; + + if (!force && sg_dma_len(sg) + sg->offset > + (host->page_idx << PAGE_SHIFT) + data->blksz - blk_head) + /* More blocks in this SG, don't unmap the next page */ + return; + } + + page = host->pg.page; + if (!page) + return; + + flush_dcache_page(page); + kunmap(page); + + host->pg.page = NULL; +} + +/* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */ +static void usdhi6_sg_advance(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + size_t done, total; + + /* New offset: set at the end of the previous block */ + if (host->head_pg.page) { + /* Finished a cross-page block, jump to the new page */ + host->page_idx++; + host->offset = data->blksz - host->head_len; + host->blk_page = host->pg.mapped; + usdhi6_sg_unmap(host, false); + } else { + host->offset += data->blksz; + /* The completed block didn't cross a page boundary */ + if (host->offset == PAGE_SIZE) { + /* If required, we'll map the page below */ + host->offset = 0; + host->page_idx++; + } + } + + /* + * Now host->blk_page + host->offset point at the end of our last block + * and host->page_idx is the index of the page, in which our new block + * is located, if any + */ + + done = (host->page_idx << PAGE_SHIFT) + host->offset; + total = host->sg->offset + sg_dma_len(host->sg); + + dev_dbg(mmc_dev(host->mmc), "%s(): %zu of %zu @ %u\n", __func__, + done, total, host->offset); + + if (done < total && host->offset) { + /* More blocks in this page */ + if (host->offset + data->blksz > PAGE_SIZE) + /* We approached at a block, that spans 2 pages */ + usdhi6_blk_bounce(host, host->sg); + + return; + } + + /* Finished current page or an SG segment */ + usdhi6_sg_unmap(host, false); + + if (done == total) { + /* + * End of an SG segment or the complete SG: jump to the next + * segment, we'll map it later in usdhi6_blk_read() or + * usdhi6_blk_write() + */ + struct scatterlist *next = sg_next(host->sg); + + host->page_idx = 0; + + if (!next) + host->wait = USDHI6_WAIT_FOR_DATA_END; + host->sg = next; + + if (WARN(next && sg_dma_len(next) % data->blksz, + "SG size %zd isn't a multiple of block size %zd\n", + sg_dma_len(next), data->blksz)) + data->error = -EINVAL; + + return; + } + + /* We cannot get here after crossing a page border */ + + /* Next page in the same SG */ + host->pg.page = nth_page(sg_page(host->sg), host->page_idx); + host->pg.mapped = kmap(host->pg.page); + host->blk_page = host->pg.mapped; + + dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p for CMD%u @ 0x%p\n", + host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, + host->mrq->cmd->opcode, host->mrq); +} + +/* DMA handling */ + +static void usdhi6_dma_release(struct usdhi6_host *host) +{ + host->dma_active = false; + if (host->chan_tx) { + struct dma_chan *chan = host->chan_tx; + host->chan_tx = NULL; + dma_release_channel(chan); + } + if (host->chan_rx) { + struct dma_chan *chan = host->chan_rx; + host->chan_rx = NULL; + dma_release_channel(chan); + } +} + +static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + + if (!host->dma_active) + return; + + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); + host->dma_active = false; + + if (data->flags & MMC_DATA_READ) + /* TODO: do we have to synchronise? */ + dma_unmap_sg(host->chan_rx->device->dev, data->sg, + data->sg_len, DMA_FROM_DEVICE); + else + dma_unmap_sg(host->chan_tx->device->dev, data->sg, + data->sg_len, DMA_TO_DEVICE); +} + +static void usdhi6_dma_complete(void *arg) +{ + struct usdhi6_host *host = arg; + struct mmc_request *mrq = host->mrq; + + if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion for %p!\n", + dev_name(mmc_dev(host->mmc)), mrq)) + return; + + dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u DMA completed\n", __func__, + mrq->cmd->opcode); + + usdhi6_dma_stop_unmap(host); + usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); +} + +static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan, + enum dma_transfer_direction dir) +{ + struct mmc_data *data = host->mrq->data; + struct scatterlist *sg = data->sg; + struct dma_async_tx_descriptor *desc = NULL; + dma_cookie_t cookie = -EINVAL; + enum dma_data_direction data_dir; + int ret; + + switch (dir) { + case DMA_MEM_TO_DEV: + data_dir = DMA_TO_DEVICE; + break; + case DMA_DEV_TO_MEM: + data_dir = DMA_FROM_DEVICE; + break; + default: + return -EINVAL; + } + + ret = dma_map_sg(chan->device->dev, sg, data->sg_len, data_dir); + if (ret > 0) { + host->dma_active = true; + desc = dmaengine_prep_slave_sg(chan, sg, ret, dir, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + } + + if (desc) { + desc->callback = usdhi6_dma_complete; + desc->callback_param = host; + cookie = dmaengine_submit(desc); + } + + dev_dbg(mmc_dev(host->mmc), "%s(): mapped %d -> %d, cookie %d @ %p\n", + __func__, data->sg_len, ret, cookie, desc); + + if (cookie < 0) { + /* DMA failed, fall back to PIO */ + if (ret >= 0) + ret = cookie; + usdhi6_dma_release(host); + dev_warn(mmc_dev(host->mmc), + "DMA failed: %d, falling back to PIO\n", ret); + } + + return cookie; +} + +static int usdhi6_dma_start(struct usdhi6_host *host) +{ + if (!host->chan_rx || !host->chan_tx) + return -ENODEV; + + if (host->mrq->data->flags & MMC_DATA_READ) + return usdhi6_dma_setup(host, host->chan_rx, DMA_DEV_TO_MEM); + + return usdhi6_dma_setup(host, host->chan_tx, DMA_MEM_TO_DEV); +} + +static void usdhi6_dma_kill(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + + dev_dbg(mmc_dev(host->mmc), "%s(): SG of %u: %ux%u\n", + __func__, data->sg_len, data->blocks, data->blksz); + /* Abort DMA */ + if (data->flags & MMC_DATA_READ) + dmaengine_terminate_all(host->chan_rx); + else + dmaengine_terminate_all(host->chan_tx); +} + +static void usdhi6_dma_check_error(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + + dev_dbg(mmc_dev(host->mmc), "%s(): IO error %d, status 0x%x\n", + __func__, host->io_error, usdhi6_read(host, USDHI6_SD_INFO1)); + + if (host->io_error) { + data->error = usdhi6_error_code(host); + data->bytes_xfered = 0; + usdhi6_dma_kill(host); + usdhi6_dma_release(host); + dev_warn(mmc_dev(host->mmc), + "DMA failed: %d, falling back to PIO\n", data->error); + return; + } + + /* + * The datasheet tells us to check a response from the card, whereas + * responses only come after the command phase, not after the data + * phase. Let's check anyway. + */ + if (host->irq_status & USDHI6_SD_INFO1_RSP_END) + dev_warn(mmc_dev(host->mmc), "Unexpected response received!\n"); +} + +static void usdhi6_dma_kick(struct usdhi6_host *host) +{ + if (host->mrq->data->flags & MMC_DATA_READ) + dma_async_issue_pending(host->chan_rx); + else + dma_async_issue_pending(host->chan_tx); +} + +static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start) +{ + struct dma_slave_config cfg = { + .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, + .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, + }; + int ret; + + host->chan_tx = dma_request_slave_channel(mmc_dev(host->mmc), "tx"); + dev_dbg(mmc_dev(host->mmc), "%s: TX: got channel %p\n", __func__, + host->chan_tx); + + if (!host->chan_tx) + return; + + cfg.direction = DMA_MEM_TO_DEV; + cfg.dst_addr = start + USDHI6_SD_BUF0; + cfg.dst_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ + cfg.src_addr = 0; + ret = dmaengine_slave_config(host->chan_tx, &cfg); + if (ret < 0) + goto e_release_tx; + + host->chan_rx = dma_request_slave_channel(mmc_dev(host->mmc), "rx"); + dev_dbg(mmc_dev(host->mmc), "%s: RX: got channel %p\n", __func__, + host->chan_rx); + + if (!host->chan_rx) + goto e_release_tx; + + cfg.direction = DMA_DEV_TO_MEM; + cfg.src_addr = cfg.dst_addr; + cfg.src_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ + cfg.dst_addr = 0; + ret = dmaengine_slave_config(host->chan_rx, &cfg); + if (ret < 0) + goto e_release_rx; + + return; + +e_release_rx: + dma_release_channel(host->chan_rx); + host->chan_rx = NULL; +e_release_tx: + dma_release_channel(host->chan_tx); + host->chan_tx = NULL; +} + +/* API helpers */ + +static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios) +{ + unsigned long rate = ios->clock; + u32 val; + unsigned int i; + + for (i = 1000; i; i--) { + if (usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_SCLKDIVEN) + break; + usleep_range(10, 100); + } + + if (!i) { + dev_err(mmc_dev(host->mmc), "SD bus busy, clock set aborted\n"); + return; + } + + val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & 0xff00; + + if (rate) { + unsigned long new_rate; + + if (host->imclk <= rate) { + if (ios->timing != MMC_TIMING_UHS_DDR50) { + /* Cannot have 1-to-1 clock in DDR mode */ + new_rate = host->imclk; + val |= 0xff; + } else { + new_rate = host->imclk / 2; + } + } else { + unsigned long div = + roundup_pow_of_two(DIV_ROUND_UP(host->imclk, rate)); + val |= div >> 2; + new_rate = host->imclk / div; + } + + if (host->rate == new_rate) + return; + + host->rate = new_rate; + + dev_dbg(mmc_dev(host->mmc), "target %lu, div %u, set %lu\n", + rate, (val & 0xff) << 2, new_rate); + } + + /* + * if old or new rate is equal to input rate, have to switch the clock + * off before changing and on after + */ + if (host->imclk == rate || host->imclk == host->rate || !rate) + usdhi6_write(host, USDHI6_SD_CLK_CTRL, + val & ~USDHI6_SD_CLK_CTRL_SCLKEN); + + if (!rate) { + host->rate = 0; + return; + } + + usdhi6_write(host, USDHI6_SD_CLK_CTRL, val); + + if (host->imclk == rate || host->imclk == host->rate || + !(val & USDHI6_SD_CLK_CTRL_SCLKEN)) + usdhi6_write(host, USDHI6_SD_CLK_CTRL, + val | USDHI6_SD_CLK_CTRL_SCLKEN); +} + +static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios) +{ + struct mmc_host *mmc = host->mmc; + + if (!IS_ERR(mmc->supply.vmmc)) + /* Errors ignored... */ + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, + ios->power_mode ? ios->vdd : 0); +} + +static int usdhi6_reset(struct usdhi6_host *host) +{ + int i; + + usdhi6_write(host, USDHI6_SOFT_RST, 6); + cpu_relax(); + usdhi6_write(host, USDHI6_SOFT_RST, 7); + for (i = 1000; i; i--) + if (usdhi6_read(host, USDHI6_SOFT_RST) & 1) + break; + + return i ? 0 : -ETIMEDOUT; +} + +static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) +{ + struct usdhi6_host *host = mmc_priv(mmc); + u32 option, mode; + int ret; + + dev_dbg(mmc_dev(mmc), "%uHz, OCR: %u, power %u, bus-width %u, timing %u\n", + ios->clock, ios->vdd, ios->power_mode, ios->bus_width, ios->timing); + + switch (ios->power_mode) { + case MMC_POWER_OFF: + usdhi6_set_power(host, ios); + usdhi6_only_cd(host); + break; + case MMC_POWER_UP: + /* + * We only also touch USDHI6_SD_OPTION from .request(), which + * cannot race with MMC_POWER_UP + */ + ret = usdhi6_reset(host); + if (ret < 0) { + dev_err(mmc_dev(mmc), "Cannot reset the interface!\n"); + } else { + usdhi6_set_power(host, ios); + usdhi6_only_cd(host); + } + break; + case MMC_POWER_ON: + option = usdhi6_read(host, USDHI6_SD_OPTION); + /* + * The eMMC standard only allows 4 or 8 bits in the DDR mode, + * the same probably holds for SD cards. We check here anyway, + * since the datasheet explicitly requires 4 bits for DDR. + */ + if (ios->bus_width == MMC_BUS_WIDTH_1) { + if (ios->timing == MMC_TIMING_UHS_DDR50) + dev_err(mmc_dev(mmc), + "4 bits are required for DDR\n"); + option |= 0x8000; + mode = 0; + } else { + option &= 0x7fff; + mode = ios->timing == MMC_TIMING_UHS_DDR50; + } + usdhi6_write(host, USDHI6_SD_OPTION, option); + usdhi6_write(host, USDHI6_SDIF_MODE, mode); + break; + } + + if (host->rate != ios->clock) + usdhi6_clk_set(host, ios); +} + +/* This is data timeout. Response timeout is fixed to 640 clock cycles */ +static void usdhi6_timeout_set(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + u32 val; + unsigned long ticks; + + if (!mrq->data) + ticks = host->rate / 1000 * mrq->cmd->busy_timeout; + else + ticks = host->rate / 1000000 * (mrq->data->timeout_ns / 1000) + + mrq->data->timeout_clks; + + if (!ticks || ticks > 1 << 27) + /* Max timeout */ + val = 14; + else if (ticks < 1 << 13) + /* Min timeout */ + val = 0; + else + val = order_base_2(ticks) - 13; + + dev_dbg(mmc_dev(host->mmc), "Set %s timeout %lu ticks @ %lu Hz\n", + mrq->data ? "data" : "cmd", ticks, host->rate); + + usdhi6_write(host, USDHI6_SD_OPTION, (val << 4) | + (usdhi6_read(host, USDHI6_SD_OPTION) & 0xff0f)); +} + +static void usdhi6_request_done(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + struct mmc_data *data = mrq->data; + + if (WARN(host->pg.page || host->head_pg.page, + "Page %p or %p not unmapped: wait %u, CMD%d(%c) @ +0x%x %ux%u in SG%u!\n", + host->pg.page, host->head_pg.page, host->wait, mrq->cmd->opcode, + data ? (data->flags & MMC_DATA_READ ? 'R' : 'W') : '-', + data ? host->offset : 0, data ? data->blocks : 0, + data ? data->blksz : 0, data ? data->sg_len : 0)) + usdhi6_sg_unmap(host, true); + + if (mrq->cmd->error || + (data && data->error) || + (mrq->stop && mrq->stop->error)) + dev_dbg(mmc_dev(host->mmc), "%s(CMD%d: %ux%u): err %d %d %d\n", + __func__, mrq->cmd->opcode, data ? data->blocks : 0, + data ? data->blksz : 0, + mrq->cmd->error, + data ? data->error : 1, + mrq->stop ? mrq->stop->error : 1); + + /* Disable DMA */ + usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); + host->wait = USDHI6_WAIT_FOR_REQUEST; + host->mrq = NULL; + + mmc_request_done(host->mmc, mrq); +} + +static int usdhi6_cmd_flags(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + struct mmc_command *cmd = mrq->cmd; + u16 opc = cmd->opcode; + + if (host->app_cmd) { + host->app_cmd = false; + opc |= USDHI6_SD_CMD_APP; + } + + if (mrq->data) { + opc |= USDHI6_SD_CMD_DATA; + + if (mrq->data->flags & MMC_DATA_READ) + opc |= USDHI6_SD_CMD_READ; + + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || + (cmd->opcode == SD_IO_RW_EXTENDED && + mrq->data->blocks > 1)) { + opc |= USDHI6_SD_CMD_MULTI; + if (!mrq->stop) + opc |= USDHI6_SD_CMD_CMD12_AUTO_OFF; + } + + switch (mmc_resp_type(cmd)) { + case MMC_RSP_NONE: + opc |= USDHI6_SD_CMD_MODE_RSP_NONE; + break; + case MMC_RSP_R1: + opc |= USDHI6_SD_CMD_MODE_RSP_R1; + break; + case MMC_RSP_R1B: + opc |= USDHI6_SD_CMD_MODE_RSP_R1B; + break; + case MMC_RSP_R2: + opc |= USDHI6_SD_CMD_MODE_RSP_R2; + break; + case MMC_RSP_R3: + opc |= USDHI6_SD_CMD_MODE_RSP_R3; + break; + default: + dev_warn(mmc_dev(host->mmc), + "Unknown response type %d\n", + mmc_resp_type(cmd)); + return -EINVAL; + } + } + + return opc; +} + +static int usdhi6_rq_start(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + struct mmc_command *cmd = mrq->cmd; + struct mmc_data *data = mrq->data; + int opc = usdhi6_cmd_flags(host); + int i; + + if (opc < 0) + return opc; + + for (i = 1000; i; i--) { + if (!(usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_CBSY)) + break; + usleep_range(10, 100); + } + + if (!i) { + dev_dbg(mmc_dev(host->mmc), "Command active, request aborted\n"); + return -EAGAIN; + } + + if (data) { + bool use_dma; + int ret = 0; + + host->page_idx = 0; + + if (cmd->opcode == SD_IO_RW_EXTENDED && data->blocks > 1) { + switch (data->blksz) { + case 512: + break; + case 32: + case 64: + case 128: + case 256: + if (mrq->stop) + ret = -EINVAL; + break; + default: + ret = -EINVAL; + } + } else if ((cmd->opcode == MMC_READ_MULTIPLE_BLOCK || + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) && + data->blksz != 512) { + ret = -EINVAL; + } + + if (ret < 0) { + dev_warn(mmc_dev(host->mmc), "%s(): %u blocks of %u bytes\n", + __func__, data->blocks, data->blksz); + return -EINVAL; + } + + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || + (cmd->opcode == SD_IO_RW_EXTENDED && + data->blocks > 1)) + usdhi6_sg_prep(host); + + usdhi6_write(host, USDHI6_SD_SIZE, data->blksz); + + if ((data->blksz >= USDHI6_MIN_DMA || + data->blocks > 1) && + (data->blksz % 4 || + data->sg->offset % 4)) + dev_dbg(mmc_dev(host->mmc), + "Bad SG of %u: %ux%u @ %u\n", data->sg_len, + data->blksz, data->blocks, data->sg->offset); + + /* Enable DMA for USDHI6_MIN_DMA bytes or more */ + use_dma = data->blksz >= USDHI6_MIN_DMA && + !(data->blksz % 4) && + usdhi6_dma_start(host) >= DMA_MIN_COOKIE; + + if (use_dma) + usdhi6_write(host, USDHI6_CC_EXT_MODE, USDHI6_CC_EXT_MODE_SDRW); + + dev_dbg(mmc_dev(host->mmc), + "%s(): request opcode %u, %u blocks of %u bytes in %u segments, %s %s @+0x%x%s\n", + __func__, cmd->opcode, data->blocks, data->blksz, + data->sg_len, use_dma ? "DMA" : "PIO", + data->flags & MMC_DATA_READ ? "read" : "write", + data->sg->offset, mrq->stop ? " + stop" : ""); + } else { + dev_dbg(mmc_dev(host->mmc), "%s(): request opcode %u\n", + __func__, cmd->opcode); + } + + /* We have to get a command completion interrupt with DMA too */ + usdhi6_wait_for_resp(host); + + host->wait = USDHI6_WAIT_FOR_CMD; + schedule_delayed_work(&host->timeout_work, host->timeout * 4); + + /* SEC bit is required to enable block counting by the core */ + usdhi6_write(host, USDHI6_SD_STOP, + data && data->blocks > 1 ? USDHI6_SD_STOP_SEC : 0); + usdhi6_write(host, USDHI6_SD_ARG, cmd->arg); + + /* Kick command execution */ + usdhi6_write(host, USDHI6_SD_CMD, opc); + + return 0; +} + +static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq) +{ + struct usdhi6_host *host = mmc_priv(mmc); + int ret; + + cancel_delayed_work_sync(&host->timeout_work); + + host->mrq = mrq; + host->sg = NULL; + + usdhi6_timeout_set(host); + ret = usdhi6_rq_start(host); + if (ret < 0) { + mrq->cmd->error = ret; + usdhi6_request_done(host); + } +} + +static int usdhi6_get_cd(struct mmc_host *mmc) +{ + struct usdhi6_host *host = mmc_priv(mmc); + /* Read is atomic, no need to lock */ + u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_CD; + +/* + * level status.CD CD_ACTIVE_HIGH card present + * 1 0 0 0 + * 1 0 1 1 + * 0 1 0 1 + * 0 1 1 0 + */ + return !status ^ !(mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH); +} + +static int usdhi6_get_ro(struct mmc_host *mmc) +{ + struct usdhi6_host *host = mmc_priv(mmc); + /* No locking as above */ + u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_WP; + +/* + * level status.WP RO_ACTIVE_HIGH card read-only + * 1 0 0 0 + * 1 0 1 1 + * 0 1 0 1 + * 0 1 1 0 + */ + return !status ^ !(mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH); +} + +static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable) +{ + struct usdhi6_host *host = mmc_priv(mmc); + + dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ? "en" : "dis"); + + if (enable) { + host->sdio_mask = USDHI6_SDIO_INFO1_IRQ & ~USDHI6_SDIO_INFO1_IOIRQ; + usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, host->sdio_mask); + usdhi6_write(host, USDHI6_SDIO_MODE, 1); + } else { + usdhi6_write(host, USDHI6_SDIO_MODE, 0); + usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, USDHI6_SDIO_INFO1_IRQ); + host->sdio_mask = USDHI6_SDIO_INFO1_IRQ; + } +} + +static struct mmc_host_ops usdhi6_ops = { + .request = usdhi6_request, + .set_ios = usdhi6_set_ios, + .get_cd = usdhi6_get_cd, + .get_ro = usdhi6_get_ro, + .enable_sdio_irq = usdhi6_enable_sdio_irq, +}; + +/* State machine handlers */ + +static void usdhi6_resp_cmd12(struct usdhi6_host *host) +{ + struct mmc_command *cmd = host->mrq->stop; + cmd->resp[0] = usdhi6_read(host, USDHI6_SD_RSP10); +} + +static void usdhi6_resp_read(struct usdhi6_host *host) +{ + struct mmc_command *cmd = host->mrq->cmd; + u32 *rsp = cmd->resp, tmp = 0; + int i; + +/* + * RSP10 39-8 + * RSP32 71-40 + * RSP54 103-72 + * RSP76 127-104 + * R2-type response: + * resp[0] = r[127..96] + * resp[1] = r[95..64] + * resp[2] = r[63..32] + * resp[3] = r[31..0] + * Other responses: + * resp[0] = r[39..8] + */ + + if (mmc_resp_type(cmd) == MMC_RSP_NONE) + return; + + if (!(host->irq_status & USDHI6_SD_INFO1_RSP_END)) { + dev_err(mmc_dev(host->mmc), + "CMD%d: response expected but is missing!\n", cmd->opcode); + return; + } + + if (mmc_resp_type(cmd) & MMC_RSP_136) + for (i = 0; i < 4; i++) { + if (i) + rsp[3 - i] = tmp >> 24; + tmp = usdhi6_read(host, USDHI6_SD_RSP10 + i * 8); + rsp[3 - i] |= tmp << 8; + } + else if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || + cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) + /* Read RSP54 to avoid conflict with auto CMD12 */ + rsp[0] = usdhi6_read(host, USDHI6_SD_RSP54); + else + rsp[0] = usdhi6_read(host, USDHI6_SD_RSP10); + + dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]); +} + +static int usdhi6_blk_read(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + u32 *p; + int i, rest; + + if (host->io_error) { + data->error = usdhi6_error_code(host); + goto error; + } + + if (host->pg.page) { + p = host->blk_page + host->offset; + } else { + p = usdhi6_sg_map(host); + if (!p) { + data->error = -ENOMEM; + goto error; + } + } + + for (i = 0; i < data->blksz / 4; i++, p++) + *p = usdhi6_read(host, USDHI6_SD_BUF0); + + rest = data->blksz % 4; + for (i = 0; i < (rest + 1) / 2; i++) { + u16 d = usdhi6_read16(host, USDHI6_SD_BUF0); + ((u8 *)p)[2 * i] = ((u8 *)&d)[0]; + if (rest > 1 && !i) + ((u8 *)p)[2 * i + 1] = ((u8 *)&d)[1]; + } + + return 0; + +error: + dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); + host->wait = USDHI6_WAIT_FOR_REQUEST; + return data->error; +} + +static int usdhi6_blk_write(struct usdhi6_host *host) +{ + struct mmc_data *data = host->mrq->data; + u32 *p; + int i, rest; + + if (host->io_error) { + data->error = usdhi6_error_code(host); + goto error; + } + + if (host->pg.page) { + p = host->blk_page + host->offset; + } else { + p = usdhi6_sg_map(host); + if (!p) { + data->error = -ENOMEM; + goto error; + } + } + + for (i = 0; i < data->blksz / 4; i++, p++) + usdhi6_write(host, USDHI6_SD_BUF0, *p); + + rest = data->blksz % 4; + for (i = 0; i < (rest + 1) / 2; i++) { + u16 d; + ((u8 *)&d)[0] = ((u8 *)p)[2 * i]; + if (rest > 1 && !i) + ((u8 *)&d)[1] = ((u8 *)p)[2 * i + 1]; + else + ((u8 *)&d)[1] = 0; + usdhi6_write16(host, USDHI6_SD_BUF0, d); + } + + return 0; + +error: + dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); + host->wait = USDHI6_WAIT_FOR_REQUEST; + return data->error; +} + +static int usdhi6_stop_cmd(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + + switch (mrq->cmd->opcode) { + case MMC_READ_MULTIPLE_BLOCK: + case MMC_WRITE_MULTIPLE_BLOCK: + if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) { + host->wait = USDHI6_WAIT_FOR_STOP; + return 0; + } + /* Unsupported STOP command */ + default: + dev_err(mmc_dev(host->mmc), + "unsupported stop CMD%d for CMD%d\n", + mrq->stop->opcode, mrq->cmd->opcode); + mrq->stop->error = -EOPNOTSUPP; + } + + return -EOPNOTSUPP; +} + +static bool usdhi6_end_cmd(struct usdhi6_host *host) +{ + struct mmc_request *mrq = host->mrq; + struct mmc_command *cmd = mrq->cmd; + + if (host->io_error) { + cmd->error = usdhi6_error_code(host); + return false; + } + + usdhi6_resp_read(host); + + if (!mrq->data) + return false; + + if (host->dma_active) { + usdhi6_dma_kick(host); + if (!mrq->stop) + host->wait = USDHI6_WAIT_FOR_DMA; + else if (usdhi6_stop_cmd(host) < 0) + return false; + } else if (mrq->data->flags & MMC_DATA_READ) { + if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || + (cmd->opcode == SD_IO_RW_EXTENDED && + mrq->data->blocks > 1)) + host->wait = USDHI6_WAIT_FOR_MREAD; + else + host->wait = USDHI6_WAIT_FOR_READ; + } else { + if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || + (cmd->opcode == SD_IO_RW_EXTENDED && + mrq->data->blocks > 1)) + host->wait = USDHI6_WAIT_FOR_MWRITE; + else + host->wait = USDHI6_WAIT_FOR_WRITE; + } + + return true; +} + +static bool usdhi6_read_block(struct usdhi6_host *host) +{ + /* ACCESS_END IRQ is already unmasked */ + int ret = usdhi6_blk_read(host); + + /* + * Have to force unmapping both pages: the single block could have been + * cross-page, in which case for single-block IO host->page_idx == 0. + * So, if we don't force, the second page won't be unmapped. + */ + usdhi6_sg_unmap(host, true); + + if (ret < 0) + return false; + + host->wait = USDHI6_WAIT_FOR_DATA_END; + return true; +} + +static bool usdhi6_mread_block(struct usdhi6_host *host) +{ + int ret = usdhi6_blk_read(host); + + if (ret < 0) + return false; + + usdhi6_sg_advance(host); + + return !host->mrq->data->error && + (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); +} + +static bool usdhi6_write_block(struct usdhi6_host *host) +{ + int ret = usdhi6_blk_write(host); + + /* See comment in usdhi6_read_block() */ + usdhi6_sg_unmap(host, true); + + if (ret < 0) + return false; + + host->wait = USDHI6_WAIT_FOR_DATA_END; + return true; +} + +static bool usdhi6_mwrite_block(struct usdhi6_host *host) +{ + int ret = usdhi6_blk_write(host); + + if (ret < 0) + return false; + + usdhi6_sg_advance(host); + + return !host->mrq->data->error && + (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); +} + +/* Interrupt & timeout handlers */ + +static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id) +{ + struct usdhi6_host *host = dev_id; + struct mmc_request *mrq; + struct mmc_command *cmd; + struct mmc_data *data; + bool io_wait = false; + + cancel_delayed_work_sync(&host->timeout_work); + + mrq = host->mrq; + if (!mrq) + return IRQ_HANDLED; + + cmd = mrq->cmd; + data = mrq->data; + + switch (host->wait) { + case USDHI6_WAIT_FOR_REQUEST: + /* We're too late, the timeout has already kicked in */ + return IRQ_HANDLED; + case USDHI6_WAIT_FOR_CMD: + /* Wait for data? */ + io_wait = usdhi6_end_cmd(host); + break; + case USDHI6_WAIT_FOR_MREAD: + /* Wait for more data? */ + io_wait = usdhi6_mread_block(host); + break; + case USDHI6_WAIT_FOR_READ: + /* Wait for data end? */ + io_wait = usdhi6_read_block(host); + break; + case USDHI6_WAIT_FOR_MWRITE: + /* Wait data to write? */ + io_wait = usdhi6_mwrite_block(host); + break; + case USDHI6_WAIT_FOR_WRITE: + /* Wait for data end? */ + io_wait = usdhi6_write_block(host); + break; + case USDHI6_WAIT_FOR_DMA: + usdhi6_dma_check_error(host); + break; + case USDHI6_WAIT_FOR_STOP: + usdhi6_write(host, USDHI6_SD_STOP, 0); + if (host->io_error) { + int ret = usdhi6_error_code(host); + if (mrq->stop) + mrq->stop->error = ret; + else + mrq->data->error = ret; + dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, ret); + break; + } + usdhi6_resp_cmd12(host); + mrq->stop->error = 0; + break; + case USDHI6_WAIT_FOR_DATA_END: + if (host->io_error) { + mrq->data->error = usdhi6_error_code(host); + dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, + mrq->data->error); + } + break; + default: + cmd->error = -EFAULT; + dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); + usdhi6_request_done(host); + return IRQ_HANDLED; + } + + if (io_wait) { + schedule_delayed_work(&host->timeout_work, host->timeout * 4); + /* Wait for more data or ACCESS_END */ + if (!host->dma_active) + usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); + return IRQ_HANDLED; + } + + if (!cmd->error) { + if (data) { + if (!data->error) { + if (host->wait != USDHI6_WAIT_FOR_STOP && + host->mrq->stop && + !host->mrq->stop->error && + !usdhi6_stop_cmd(host)) { + /* Sending STOP */ + usdhi6_wait_for_resp(host); + + schedule_delayed_work(&host->timeout_work, + host->timeout * 4); + + return IRQ_HANDLED; + } + + data->bytes_xfered = data->blocks * data->blksz; + } else { + /* Data error: might need to unmap the last page */ + dev_warn(mmc_dev(host->mmc), "%s(): data error %d\n", + __func__, data->error); + usdhi6_sg_unmap(host, true); + } + } else if (cmd->opcode == MMC_APP_CMD) { + host->app_cmd = true; + } + } + + usdhi6_request_done(host); + + return IRQ_HANDLED; +} + +static irqreturn_t usdhi6_sd(int irq, void *dev_id) +{ + struct usdhi6_host *host = dev_id; + u16 status, status2, error; + + status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & + ~USDHI6_SD_INFO1_CARD; + status2 = usdhi6_read(host, USDHI6_SD_INFO2) & ~host->status2_mask; + + usdhi6_only_cd(host); + + dev_dbg(mmc_dev(host->mmc), + "IRQ status = 0x%08x, status2 = 0x%08x\n", status, status2); + + if (!status && !status2) + return IRQ_NONE; + + error = status2 & USDHI6_SD_INFO2_ERR; + + /* Ack / clear interrupts */ + if (USDHI6_SD_INFO1_IRQ & status) + usdhi6_write(host, USDHI6_SD_INFO1, + 0xffff & ~(USDHI6_SD_INFO1_IRQ & status)); + + if (USDHI6_SD_INFO2_IRQ & status2) { + if (error) + /* In error cases BWE and BRE aren't cleared automatically */ + status2 |= USDHI6_SD_INFO2_BWE | USDHI6_SD_INFO2_BRE; + + usdhi6_write(host, USDHI6_SD_INFO2, + 0xffff & ~(USDHI6_SD_INFO2_IRQ & status2)); + } + + host->io_error = error; + host->irq_status = status; + + if (error) { + /* Don't pollute the log with unsupported command timeouts */ + if (host->wait != USDHI6_WAIT_FOR_CMD || + error != USDHI6_SD_INFO2_RSP_TOUT) + dev_warn(mmc_dev(host->mmc), + "%s(): INFO2 error bits 0x%08x\n", + __func__, error); + else + dev_dbg(mmc_dev(host->mmc), + "%s(): INFO2 error bits 0x%08x\n", + __func__, error); + } + + return IRQ_WAKE_THREAD; +} + +static irqreturn_t usdhi6_sdio(int irq, void *dev_id) +{ + struct usdhi6_host *host = dev_id; + u32 status = usdhi6_read(host, USDHI6_SDIO_INFO1) & ~host->sdio_mask; + + dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__, status); + + if (!status) + return IRQ_NONE; + + usdhi6_write(host, USDHI6_SDIO_INFO1, ~status); + + mmc_signal_sdio_irq(host->mmc); + + return IRQ_HANDLED; +} + +static irqreturn_t usdhi6_cd(int irq, void *dev_id) +{ + struct usdhi6_host *host = dev_id; + struct mmc_host *mmc = host->mmc; + u16 status; + + /* We're only interested in hotplug events here */ + status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & + USDHI6_SD_INFO1_CARD; + + if (!status) + return IRQ_NONE; + + /* Ack */ + usdhi6_write(host, USDHI6_SD_INFO1, !status); + + if (!work_pending(&mmc->detect.work) && + (((status & USDHI6_SD_INFO1_CARD_INSERT) && + !mmc->card) || + ((status & USDHI6_SD_INFO1_CARD_EJECT) && + mmc->card))) + mmc_detect_change(mmc, msecs_to_jiffies(100)); + + return IRQ_HANDLED; +} + +/* + * Actually this should not be needed, if the built-in timeout works reliably in + * the both PIO cases and DMA never fails. But if DMA does fail, a timeout + * handler might be the only way to catch the error. + */ +static void usdhi6_timeout_work(struct work_struct *work) +{ + struct delayed_work *d = container_of(work, struct delayed_work, work); + struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work); + struct mmc_request *mrq = host->mrq; + struct mmc_data *data = mrq ? mrq->data : NULL; + + dev_warn(mmc_dev(host->mmc), + "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n", + host->dma_active ? "DMA" : "PIO", + host->wait, mrq ? mrq->cmd->opcode : -1, + usdhi6_read(host, USDHI6_SD_INFO1), + usdhi6_read(host, USDHI6_SD_INFO2), host->irq_status); + + if (host->dma_active) { + usdhi6_dma_kill(host); + usdhi6_dma_stop_unmap(host); + } + + switch (host->wait) { + default: + dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); + /* mrq can be NULL in this actually impossible case */ + case USDHI6_WAIT_FOR_CMD: + usdhi6_error_code(host); + if (mrq) + mrq->cmd->error = -ETIMEDOUT; + break; + case USDHI6_WAIT_FOR_STOP: + usdhi6_error_code(host); + mrq->stop->error = -ETIMEDOUT; + break; + case USDHI6_WAIT_FOR_DMA: + case USDHI6_WAIT_FOR_MREAD: + case USDHI6_WAIT_FOR_MWRITE: + case USDHI6_WAIT_FOR_READ: + case USDHI6_WAIT_FOR_WRITE: + dev_dbg(mmc_dev(host->mmc), + "%c: page #%u @ +0x%x %ux%u in SG%u. Current SG %u bytes @ %u\n", + data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx, + host->offset, data->blocks, data->blksz, data->sg_len, + sg_dma_len(host->sg), host->sg->offset); + usdhi6_sg_unmap(host, true); + /* + * If USDHI6_WAIT_FOR_DATA_END times out, we have already unmapped + * the page + */ + case USDHI6_WAIT_FOR_DATA_END: + usdhi6_error_code(host); + data->error = -ETIMEDOUT; + } + + if (mrq) + usdhi6_request_done(host); +} + +/* Probe / release */ + +static const struct of_device_id usdhi6_of_match[] = { + {.compatible = "renesas,usdhi6rol0"}, + {} +}; +MODULE_DEVICE_TABLE(of, usdhi6_of_match); + +static int usdhi6_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mmc_host *mmc; + struct usdhi6_host *host; + struct resource *res; + int irq_cd, irq_sd, irq_sdio; + u32 version; + int ret; + + if (!dev->of_node) + return -ENODEV; + + irq_cd = platform_get_irq_byname(pdev, "card detect"); + irq_sd = platform_get_irq_byname(pdev, "data"); + irq_sdio = platform_get_irq_byname(pdev, "SDIO"); + if (irq_sd < 0 || irq_sdio < 0) + return -ENODEV; + + mmc = mmc_alloc_host(sizeof(struct usdhi6_host), dev); + if (!mmc) + return -ENOMEM; + + ret = mmc_of_parse(mmc); + if (ret < 0) + goto e_free_mmc; + + mmc_regulator_get_supply(mmc); + + host = mmc_priv(mmc); + host->mmc = mmc; + host->wait = USDHI6_WAIT_FOR_REQUEST; + host->timeout = msecs_to_jiffies(1000); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + host->base = devm_ioremap_resource(dev, res); + if (IS_ERR(host->base)) { + ret = PTR_ERR(host->base); + goto e_free_mmc; + } + + host->clk = devm_clk_get(dev, NULL); + if (IS_ERR(host->clk)) + goto e_free_mmc; + + host->imclk = clk_get_rate(host->clk); + + ret = clk_prepare_enable(host->clk); + if (ret < 0) + goto e_free_mmc; + + version = usdhi6_read(host, USDHI6_VERSION); + if ((version & 0xfff) != 0xa0d) { + dev_err(dev, "Version not recognized %x\n", version); + goto e_clk_off; + } + + dev_info(dev, "A USDHI6ROL0 SD host detected with %d ports\n", + usdhi6_read(host, USDHI6_SD_PORT_SEL) >> 8); + + usdhi6_mask_all(host); + + if (irq_cd >= 0) { + ret = devm_request_irq(dev, irq_cd, usdhi6_cd, 0, + dev_name(dev), host); + if (ret < 0) + goto e_clk_off; + } else { + mmc->caps |= MMC_CAP_NEEDS_POLL; + } + + ret = devm_request_threaded_irq(dev, irq_sd, usdhi6_sd, usdhi6_sd_bh, 0, + dev_name(dev), host); + if (ret < 0) + goto e_clk_off; + + ret = devm_request_irq(dev, irq_sdio, usdhi6_sdio, 0, + dev_name(dev), host); + if (ret < 0) + goto e_clk_off; + + INIT_DELAYED_WORK(&host->timeout_work, usdhi6_timeout_work); + + usdhi6_dma_request(host, res->start); + + mmc->ops = &usdhi6_ops; + mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_DDR50 | MMC_CAP_SDIO_IRQ; + /* Set .max_segs to some random number. Feel free to adjust. */ + mmc->max_segs = 32; + mmc->max_blk_size = 512; + mmc->max_req_size = PAGE_CACHE_SIZE * mmc->max_segs; + mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; + /* + * Setting .max_seg_size to 1 page would simplify our page-mapping code, + * But OTOH, having large segments makes DMA more efficient. We could + * check, whether we managed to get DMA and fall back to 1 page + * segments, but if we do manage to obtain DMA and then it fails at + * run-time and we fall back to PIO, we will continue getting large + * segments. So, we wouldn't be able to get rid of the code anyway. + */ + mmc->max_seg_size = mmc->max_req_size; + if (!mmc->f_max) + mmc->f_max = host->imclk; + mmc->f_min = host->imclk / 512; + + platform_set_drvdata(pdev, host); + + ret = mmc_add_host(mmc); + if (ret < 0) + goto e_clk_off; + + return 0; + +e_clk_off: + clk_disable_unprepare(host->clk); +e_free_mmc: + mmc_free_host(mmc); + + return ret; +} + +static int usdhi6_remove(struct platform_device *pdev) +{ + struct usdhi6_host *host = platform_get_drvdata(pdev); + + mmc_remove_host(host->mmc); + + usdhi6_mask_all(host); + cancel_delayed_work_sync(&host->timeout_work); + usdhi6_dma_release(host); + clk_disable_unprepare(host->clk); + mmc_free_host(host->mmc); + + return 0; +} + +static struct platform_driver usdhi6_driver = { + .probe = usdhi6_probe, + .remove = usdhi6_remove, + .driver = { + .name = "usdhi6rol0", + .owner = THIS_MODULE, + .of_match_table = usdhi6_of_match, + }, +}; + +module_platform_driver(usdhi6_driver); + +MODULE_DESCRIPTION("Renesas usdhi6rol0 SD/SDIO host driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:usdhi6rol0"); +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
This patch adds a driver for the Renesas usdhi6rol0 SD/SDIO host controller in both PIO and DMA modes. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> --- v2: copyright and Sob email changed .../devicetree/bindings/mmc/usdhi6rol0.txt | 33 + drivers/mmc/host/Kconfig | 6 + drivers/mmc/host/Makefile | 1 + drivers/mmc/host/usdhi6rol0.c | 1834 ++++++++++++++++++++ 4 files changed, 1874 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/usdhi6rol0.txt create mode 100644 drivers/mmc/host/usdhi6rol0.c