From patchwork Mon Aug 2 07:51:59 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hu Mingkai-B21284 X-Patchwork-Id: 116458 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o728MsOi023566 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 2 Aug 2010 08:23:30 GMT Received: from localhost ([127.0.0.1] helo=sfs-ml-2.v29.ch3.sourceforge.com) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1OfqIQ-0004ry-Gb; Mon, 02 Aug 2010 08:22:54 +0000 Received: from sog-mx-1.v43.ch3.sourceforge.com ([172.29.43.191] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1OfqIP-0004rs-2J for spi-devel-general@lists.sourceforge.net; Mon, 02 Aug 2010 08:22:53 +0000 X-ACL-Warn: Received: from db3ehsobe003.messaging.microsoft.com ([213.199.154.141] helo=DB3EHSOBE003.bigfish.com) by sog-mx-1.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-MD5:128) (Exim 4.69) id 1OfqIM-0003kH-V3 for spi-devel-general@lists.sourceforge.net; Mon, 02 Aug 2010 08:22:53 +0000 Received: from mail78-db3-R.bigfish.com (10.3.81.241) by DB3EHSOBE003.bigfish.com (10.3.84.23) with Microsoft SMTP Server id 8.1.436.0; Mon, 2 Aug 2010 08:07:35 +0000 Received: from mail78-db3 (localhost.localdomain [127.0.0.1]) by mail78-db3-R.bigfish.com (Postfix) with ESMTP id 679C7DC80B6 for ; Mon, 2 Aug 2010 08:07:35 +0000 (UTC) X-SpamScore: 22 X-BigFish: VS22(zz936eMa615m853kc8ka6eajzz1202hzzz2dh2a8h465j419m68o) X-Spam-TCS-SCL: 7:0 Received: from mail78-db3 (localhost.localdomain [127.0.0.1]) by mail78-db3 (MessageSwitch) id 1280736445483305_17302; Mon, 2 Aug 2010 08:07:25 +0000 (UTC) Received: from DB3EHSMHS010.bigfish.com (unknown [10.3.81.251]) by mail78-db3.bigfish.com (Postfix) with ESMTP id 70F591B38050 for ; Mon, 2 Aug 2010 08:07:25 +0000 (UTC) Received: from az33egw02.freescale.net (192.88.158.103) by DB3EHSMHS010.bigfish.com (10.3.87.110) with Microsoft SMTP Server (TLS) id 14.0.482.44; Mon, 2 Aug 2010 08:07:13 +0000 Received: from de01smr01.freescale.net (de01smr01.freescale.net [10.208.0.31]) by az33egw02.freescale.net (8.14.3/8.14.3) with ESMTP id o72879gb012336 for ; Mon, 2 Aug 2010 01:07:11 -0700 (MST) Received: from zch01exm21.fsl.freescale.net (zch01exm21.ap.freescale.net [10.192.129.205]) by de01smr01.freescale.net (8.13.1/8.13.0) with ESMTP id o728JmSY021245 for ; Mon, 2 Aug 2010 03:19:50 -0500 (CDT) Received: from localhost ([10.193.20.106]) by zch01exm21.fsl.freescale.net with Microsoft SMTPSVC(6.0.3790.3959); Mon, 2 Aug 2010 16:07:04 +0800 From: Mingkai Hu To: linuxppc-dev@ozlabs.org, spi-devel-general@lists.sourceforge.net Date: Mon, 2 Aug 2010 15:51:59 +0800 Message-ID: <1280735524-17547-2-git-send-email-Mingkai.hu@freescale.com> X-Mailer: git-send-email 1.6.4 In-Reply-To: <1280735524-17547-1-git-send-email-Mingkai.hu@freescale.com> References: <1280735524-17547-1-git-send-email-Mingkai.hu@freescale.com> X-OriginalArrivalTime: 02 Aug 2010 08:07:05.0027 (UTC) FILETIME=[B1E3F930:01CB3219] MIME-Version: 1.0 X-Reverse-DNS: az33egw02.freescale.net X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 0.0 AWL AWL: From: address is in the auto white-list X-Headers-End: 1OfqIM-0003kH-V3 Cc: kumar.gala@freescale.com, tie-fei.zang@freescale.com, Mingkai Hu Subject: [spi-devel-general] [PATCH v2 1/6] spi/mpc8xxx: refactor the common code for SPI/eSPI controller X-BeenThere: spi-devel-general@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux SPI core/device drivers discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces@lists.sourceforge.net X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Mon, 02 Aug 2010 08:23:31 +0000 (UTC) diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 91c2f4f..cd7f13b 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -127,6 +127,19 @@ config SPI_EP93XX To compile this driver as a module, choose M here. The module will be called ep93xx_spi. +config SPI_FSL_LIB + tristate + depends on FSL_SOC + +config SPI_FSL_SPI + tristate "Freescale SPI controller" + depends on FSL_SOC + select SPI_FSL_LIB + help + This enables using the Freescale SPI controllers in master mode. + MPC83xx platform uses the controller in cpu mode or CPM/QE mode. + MPC8569 uses the controller in QE mode, MPC8610 in cpu mode. + config SPI_GPIO tristate "GPIO-based bitbanging SPI Master" depends on GENERIC_GPIO @@ -182,13 +195,6 @@ config SPI_MPC512x_PSC This enables using the Freescale MPC5121 Programmable Serial Controller in SPI master mode. -config SPI_MPC8xxx - tristate "Freescale MPC8xxx SPI controller" - depends on FSL_SOC - help - This enables using the Freescale MPC8xxx SPI controllers in master - mode. - config SPI_OMAP_UWIRE tristate "OMAP1 MicroWire" depends on ARCH_OMAP1 diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index e9cbd18..cf8d9be 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -22,6 +22,8 @@ obj-$(CONFIG_SPI_DESIGNWARE) += dw_spi.o obj-$(CONFIG_SPI_DW_PCI) += dw_spi_pci.o obj-$(CONFIG_SPI_DW_MMIO) += dw_spi_mmio.o obj-$(CONFIG_SPI_EP93XX) += ep93xx_spi.o +obj-$(CONFIG_SPI_FSL_LIB) += spi_fsl_lib.o +obj-$(CONFIG_SPI_FSL_SPI) += spi_fsl_spi.o obj-$(CONFIG_SPI_GPIO) += spi_gpio.o obj-$(CONFIG_SPI_IMX) += spi_imx.o obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o @@ -34,7 +36,6 @@ obj-$(CONFIG_SPI_PL022) += amba-pl022.o obj-$(CONFIG_SPI_MPC512x_PSC) += mpc512x_psc_spi.o obj-$(CONFIG_SPI_MPC52xx_PSC) += mpc52xx_psc_spi.o obj-$(CONFIG_SPI_MPC52xx) += mpc52xx_spi.o -obj-$(CONFIG_SPI_MPC8xxx) += spi_mpc8xxx.o obj-$(CONFIG_SPI_PPC4xx) += spi_ppc4xx.o obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx_hw.o diff --git a/drivers/spi/spi_fsl_lib.c b/drivers/spi/spi_fsl_lib.c new file mode 100644 index 0000000..23b1b2f --- /dev/null +++ b/drivers/spi/spi_fsl_lib.c @@ -0,0 +1,237 @@ +/* + * Freescale SPI/eSPI controller driver library. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov + * + * Copyright 2010 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include "spi_fsl_lib.h" + +#define MPC8XXX_SPI_RX_BUF(type) \ +void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ +{ \ + type *rx = mpc8xxx_spi->rx; \ + *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ + mpc8xxx_spi->rx = rx; \ +} + +#define MPC8XXX_SPI_TX_BUF(type) \ +u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ +{ \ + u32 data; \ + const type *tx = mpc8xxx_spi->tx; \ + if (!tx) \ + return 0; \ + data = *tx++ << mpc8xxx_spi->tx_shift; \ + mpc8xxx_spi->tx = tx; \ + return data; \ +} + +MPC8XXX_SPI_RX_BUF(u8) +MPC8XXX_SPI_RX_BUF(u16) +MPC8XXX_SPI_RX_BUF(u32) +MPC8XXX_SPI_TX_BUF(u8) +MPC8XXX_SPI_TX_BUF(u16) +MPC8XXX_SPI_TX_BUF(u32) + +struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata) +{ + return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); +} + +void mpc8xxx_spi_work(struct work_struct *work) +{ + struct mpc8xxx_spi *mpc8xxx_spi = container_of(work, struct mpc8xxx_spi, + work); + + spin_lock_irq(&mpc8xxx_spi->lock); + while (!list_empty(&mpc8xxx_spi->queue)) { + struct spi_message *m = container_of(mpc8xxx_spi->queue.next, + struct spi_message, queue); + + list_del_init(&m->queue); + spin_unlock_irq(&mpc8xxx_spi->lock); + + if (mpc8xxx_spi->spi_do_one_msg) + mpc8xxx_spi->spi_do_one_msg(m); + + spin_lock_irq(&mpc8xxx_spi->lock); + } + spin_unlock_irq(&mpc8xxx_spi->lock); +} + +int mpc8xxx_spi_transfer(struct spi_device *spi, + struct spi_message *m) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + unsigned long flags; + + m->actual_length = 0; + m->status = -EINPROGRESS; + + spin_lock_irqsave(&mpc8xxx_spi->lock, flags); + list_add_tail(&m->queue, &mpc8xxx_spi->queue); + queue_work(mpc8xxx_spi->workqueue, &mpc8xxx_spi->work); + spin_unlock_irqrestore(&mpc8xxx_spi->lock, flags); + + return 0; +} + + +void mpc8xxx_spi_cleanup(struct spi_device *spi) +{ + kfree(spi->controller_state); +} + +const char *mpc8xxx_spi_strmode(unsigned int flags) +{ + if (flags & SPI_QE_CPU_MODE) { + return "QE CPU"; + } else if (flags & SPI_CPM_MODE) { + if (flags & SPI_QE) + return "QE"; + else if (flags & SPI_CPM2) + return "CPM2"; + else + return "CPM1"; + } + return "CPU"; +} + +int mpc8xxx_spi_probe(struct device *dev, struct resource *mem, + unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct spi_master *master; + struct mpc8xxx_spi *mpc8xxx_spi; + int ret = 0; + + master = dev_get_drvdata(dev); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH + | SPI_LSB_FIRST | SPI_LOOP; + + master->transfer = mpc8xxx_spi_transfer; + master->cleanup = mpc8xxx_spi_cleanup; + + mpc8xxx_spi = spi_master_get_devdata(master); + mpc8xxx_spi->dev = dev; + mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; + mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; + mpc8xxx_spi->flags = pdata->flags; + mpc8xxx_spi->spibrg = pdata->sysclk; + mpc8xxx_spi->irq = irq; + + mpc8xxx_spi->rx_shift = 0; + mpc8xxx_spi->tx_shift = 0; + + init_completion(&mpc8xxx_spi->done); + + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->max_chipselect; + + spin_lock_init(&mpc8xxx_spi->lock); + init_completion(&mpc8xxx_spi->done); + INIT_WORK(&mpc8xxx_spi->work, mpc8xxx_spi_work); + INIT_LIST_HEAD(&mpc8xxx_spi->queue); + + mpc8xxx_spi->workqueue = create_singlethread_workqueue( + dev_name(master->dev.parent)); + if (mpc8xxx_spi->workqueue == NULL) { + ret = -EBUSY; + goto err; + } + + return 0; + +err: + return ret; +} + +int __devexit mpc8xxx_spi_remove(struct device *dev) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + struct spi_master *master; + + master = dev_get_drvdata(dev); + mpc8xxx_spi = spi_master_get_devdata(master); + + flush_workqueue(mpc8xxx_spi->workqueue); + destroy_workqueue(mpc8xxx_spi->workqueue); + spi_unregister_master(master); + + free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); + + if (mpc8xxx_spi->spi_remove) + mpc8xxx_spi->spi_remove(mpc8xxx_spi); + + return 0; +} + +int __devinit of_mpc8xxx_spi_probe(struct of_device *ofdev, + const struct of_device_id *ofid) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct mpc8xxx_spi_probe_info *pinfo; + struct fsl_spi_platform_data *pdata; + const void *prop; + int ret = -ENOMEM; + + pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL); + if (!pinfo) + return -ENOMEM; + + pdata = &pinfo->pdata; + dev->platform_data = pdata; + + /* Allocate bus num dynamically. */ + pdata->bus_num = -1; + + /* SPI controller is either clocked from QE or SoC clock. */ + pdata->sysclk = get_brgfreq(); + if (pdata->sysclk == -1) { + pdata->sysclk = fsl_get_sys_freq(); + if (pdata->sysclk == -1) { + ret = -ENODEV; + goto err; + } + } + + prop = of_get_property(np, "mode", NULL); + if (prop && !strcmp(prop, "cpu-qe")) + pdata->flags = SPI_QE_CPU_MODE; + else if (prop && !strcmp(prop, "qe")) + pdata->flags = SPI_CPM_MODE | SPI_QE; + else if (of_device_is_compatible(np, "fsl,cpm2-spi")) + pdata->flags = SPI_CPM_MODE | SPI_CPM2; + else if (of_device_is_compatible(np, "fsl,cpm1-spi")) + pdata->flags = SPI_CPM_MODE | SPI_CPM1; + + return 0; + +err: + kfree(pinfo); + return ret; +} diff --git a/drivers/spi/spi_fsl_lib.h b/drivers/spi/spi_fsl_lib.h new file mode 100644 index 0000000..774e1c8 --- /dev/null +++ b/drivers/spi/spi_fsl_lib.h @@ -0,0 +1,119 @@ +/* + * Freescale SPI/eSPI controller driver library. + * + * Maintainer: Kumar Gala + * + * Copyright 2010 Freescale Semiconductor, Inc. + * Copyright (C) 2006 Polycom, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ +#ifndef __SPI_FSL_LIB_H__ +#define __SPI_FSL_LIB_H__ + +/* SPI/eSPI Controller driver's private data. */ +struct mpc8xxx_spi { + struct device *dev; + struct fsl_spi_reg __iomem *base; + + /* rx & tx bufs from the spi_transfer */ + const void *tx; + void *rx; + + int subblock; + struct spi_pram __iomem *pram; + struct cpm_buf_desc __iomem *tx_bd; + struct cpm_buf_desc __iomem *rx_bd; + + struct spi_transfer *xfer_in_progress; + + /* dma addresses for CPM transfers */ + dma_addr_t tx_dma; + dma_addr_t rx_dma; + bool map_tx_dma; + bool map_rx_dma; + + dma_addr_t dma_dummy_tx; + dma_addr_t dma_dummy_rx; + + /* functions to deal with different sized buffers */ + void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); + u32(*get_tx) (struct mpc8xxx_spi *); + + /* hooks for different controller driver */ + void (*spi_do_one_msg) (struct spi_message *m); + void (*spi_remove) (struct mpc8xxx_spi *mspi); + + unsigned int count; + unsigned int irq; + + unsigned nsecs; /* (clock cycle time)/2 */ + + u32 spibrg; /* SPIBRG input clock */ + u32 rx_shift; /* RX data reg shift when in qe mode */ + u32 tx_shift; /* TX data reg shift when in qe mode */ + + unsigned int flags; + + struct workqueue_struct *workqueue; + struct work_struct work; + + struct list_head queue; + spinlock_t lock; + + struct completion done; +}; + +struct spi_mpc8xxx_cs { + /* functions to deal with different sized buffers */ + void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); + u32 (*get_tx) (struct mpc8xxx_spi *); + u32 rx_shift; /* RX data reg shift when in qe mode */ + u32 tx_shift; /* TX data reg shift when in qe mode */ + u32 hw_mode; /* Holds HW mode register settings */ +}; + +static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val) +{ + out_be32(reg, val); +} + +static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg) +{ + return in_be32(reg); +} + +struct mpc8xxx_spi_probe_info { + struct fsl_spi_platform_data pdata; + int *gpios; + bool *alow_flags; +}; + +extern u32 mpc8xxx_spi_tx_buf_u8(struct mpc8xxx_spi *mpc8xxx_spi); +extern u32 mpc8xxx_spi_tx_buf_u16(struct mpc8xxx_spi *mpc8xxx_spi); +extern u32 mpc8xxx_spi_tx_buf_u32(struct mpc8xxx_spi *mpc8xxx_spi); +extern void mpc8xxx_spi_rx_buf_u8(u32 data, struct mpc8xxx_spi *mpc8xxx_spi); +extern void mpc8xxx_spi_rx_buf_u16(u32 data, struct mpc8xxx_spi *mpc8xxx_spi); +extern void mpc8xxx_spi_rx_buf_u32(u32 data, struct mpc8xxx_spi *mpc8xxx_spi); + +extern struct mpc8xxx_spi_probe_info *to_of_pinfo( + struct fsl_spi_platform_data *pdata); +extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, unsigned int len); +extern int mpc8xxx_spi_transfer(struct spi_device *spi, struct spi_message *m); +extern void mpc8xxx_spi_cleanup(struct spi_device *spi); +extern const char *mpc8xxx_spi_strmode(unsigned int flags); +extern int mpc8xxx_spi_probe(struct device *dev, struct resource *mem, + unsigned int irq); +extern int mpc8xxx_spi_remove(struct device *dev); +extern int of_mpc8xxx_spi_probe(struct of_device *ofdev, + const struct of_device_id *ofid); + +#endif /* __SPI_FSL_LIB_H__ */ diff --git a/drivers/spi/spi_fsl_spi.c b/drivers/spi/spi_fsl_spi.c new file mode 100644 index 0000000..06b0590 --- /dev/null +++ b/drivers/spi/spi_fsl_spi.c @@ -0,0 +1,1173 @@ +/* + * Freescale SPI controller driver. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov + * + * Copyright 2010 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "spi_fsl_lib.h" + +/* SPI Controller registers */ +struct fsl_spi_reg { + u8 res1[0x20]; + __be32 mode; + __be32 event; + __be32 mask; + __be32 command; + __be32 transmit; + __be32 receive; +}; + +/* CPM1 and CPM2 are mutually exclusive. */ +#ifdef CONFIG_CPM1 +#include +#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0) +#else +#include +#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0) +#endif + +/* SPI Controller mode register definitions */ +#define SPMODE_LOOP (1 << 30) +#define SPMODE_CI_INACTIVEHIGH (1 << 29) +#define SPMODE_CP_BEGIN_EDGECLK (1 << 28) +#define SPMODE_DIV16 (1 << 27) +#define SPMODE_REV (1 << 26) +#define SPMODE_MS (1 << 25) +#define SPMODE_ENABLE (1 << 24) +#define SPMODE_LEN(x) ((x) << 20) +#define SPMODE_PM(x) ((x) << 16) +#define SPMODE_OP (1 << 14) +#define SPMODE_CG(x) ((x) << 7) + +/* + * Default for SPI Mode: + * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk + */ +#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \ + SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf)) + +/* SPIE register values */ +#define SPIE_NE 0x00000200 /* Not empty */ +#define SPIE_NF 0x00000100 /* Not full */ + +/* SPIM register values */ +#define SPIM_NE 0x00000200 /* Not empty */ +#define SPIM_NF 0x00000100 /* Not full */ + +#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */ +#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */ + +/* SPCOM register values */ +#define SPCOM_STR (1 << 23) /* Start transmit */ + +#define SPI_PRAM_SIZE 0x100 +#define SPI_MRBLR ((unsigned int)PAGE_SIZE) + +static void *fsl_dummy_rx; +static DEFINE_MUTEX(fsl_dummy_rx_lock); +static int fsl_dummy_rx_refcnt; + +static void fsl_spi_change_mode(struct spi_device *spi) +{ + struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); + struct spi_mpc8xxx_cs *cs = spi->controller_state; + __be32 __iomem *mode = &mspi->base->mode; + unsigned long flags; + + if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) + return; + + /* Turn off IRQs locally to minimize time that SPI is disabled. */ + local_irq_save(flags); + + /* Turn off SPI unit prior changing mode */ + mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); + + /* When in CPM mode, we need to reinit tx and rx. */ + if (mspi->flags & SPI_CPM_MODE) { + if (mspi->flags & SPI_QE) { + qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock, + QE_CR_PROTOCOL_UNSPECIFIED, 0); + } else { + cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX); + if (mspi->flags & SPI_CPM1) { + out_be16(&mspi->pram->rbptr, + in_be16(&mspi->pram->rbase)); + out_be16(&mspi->pram->tbptr, + in_be16(&mspi->pram->tbase)); + } + } + } + mpc8xxx_spi_write_reg(mode, cs->hw_mode); + local_irq_restore(flags); +} + +static void fsl_spi_chipselect(struct spi_device *spi, int value) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data; + bool pol = spi->mode & SPI_CS_HIGH; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + if (value == BITBANG_CS_INACTIVE) { + if (pdata->cs_control) + pdata->cs_control(spi, !pol); + } + + if (value == BITBANG_CS_ACTIVE) { + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + fsl_spi_change_mode(spi); + + if (pdata->cs_control) + pdata->cs_control(spi, pol); + } +} + +static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, + struct spi_device *spi, + struct mpc8xxx_spi *mpc8xxx_spi, + int bits_per_word) +{ + cs->rx_shift = 0; + cs->tx_shift = 0; + if (bits_per_word <= 8) { + cs->get_rx = mpc8xxx_spi_rx_buf_u8; + cs->get_tx = mpc8xxx_spi_tx_buf_u8; + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { + cs->rx_shift = 16; + cs->tx_shift = 24; + } + } else if (bits_per_word <= 16) { + cs->get_rx = mpc8xxx_spi_rx_buf_u16; + cs->get_tx = mpc8xxx_spi_tx_buf_u16; + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { + cs->rx_shift = 16; + cs->tx_shift = 16; + } + } else if (bits_per_word <= 32) { + cs->get_rx = mpc8xxx_spi_rx_buf_u32; + cs->get_tx = mpc8xxx_spi_tx_buf_u32; + } else + return -EINVAL; + + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE && + spi->mode & SPI_LSB_FIRST) { + cs->tx_shift = 0; + if (bits_per_word <= 8) + cs->rx_shift = 8; + else + cs->rx_shift = 0; + } + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + return bits_per_word; +} + +static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, + struct spi_device *spi, + int bits_per_word) +{ + /* QE uses Little Endian for words > 8 + * so transform all words > 8 into 8 bits + * Unfortnatly that doesn't work for LSB so + * reject these for now */ + /* Note: 32 bits word, LSB works iff + * tfcr/rfcr is set to CPMFCR_GBL */ + if (spi->mode & SPI_LSB_FIRST && + bits_per_word > 8) + return -EINVAL; + if (bits_per_word > 8) + return 8; /* pretend its 8 bits */ + return bits_per_word; +} + +static int fsl_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + int bits_per_word = 0; + u8 pm; + u32 hz = 0; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + mpc8xxx_spi = spi_master_get_devdata(spi->master); + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } + + /* spi_transfer level calls that work per-word */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + + /* Make sure its a bit width we support [4..16, 32] */ + if ((bits_per_word < 4) + || ((bits_per_word > 16) && (bits_per_word != 32))) + return -EINVAL; + + if (!hz) + hz = spi->max_speed_hz; + + if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) + bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, + mpc8xxx_spi, + bits_per_word); + else if (mpc8xxx_spi->flags & SPI_QE) + bits_per_word = mspi_apply_qe_mode_quirks(cs, spi, + bits_per_word); + + if (bits_per_word < 0) + return bits_per_word; + + if (bits_per_word == 32) + bits_per_word = 0; + else + bits_per_word = bits_per_word - 1; + + /* mask out bits we are going to set */ + cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 + | SPMODE_PM(0xF)); + + cs->hw_mode |= SPMODE_LEN(bits_per_word); + + if ((mpc8xxx_spi->spibrg / hz) > 64) { + cs->hw_mode |= SPMODE_DIV16; + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; + + WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " + "Will use %d Hz instead.\n", dev_name(&spi->dev), + hz, mpc8xxx_spi->spibrg / 1024); + if (pm > 16) + pm = 16; + } else { + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; + } + if (pm) + pm--; + + cs->hw_mode |= SPMODE_PM(pm); + + fsl_spi_change_mode(spi); + return 0; +} + +static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) +{ + struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd; + struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd; + unsigned int xfer_len = min(mspi->count, SPI_MRBLR); + unsigned int xfer_ofs; + + xfer_ofs = mspi->xfer_in_progress->len - mspi->count; + + out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs); + out_be16(&rx_bd->cbd_datlen, 0); + out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP); + + out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs); + out_be16(&tx_bd->cbd_datlen, xfer_len); + out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | + BD_SC_LAST); + + /* start transfer */ + mpc8xxx_spi_write_reg(&mspi->base->command, SPCOM_STR); +} + +static int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, bool is_dma_mapped) +{ + struct device *dev = mspi->dev; + + if (is_dma_mapped) { + mspi->map_tx_dma = 0; + mspi->map_rx_dma = 0; + } else { + mspi->map_tx_dma = 1; + mspi->map_rx_dma = 1; + } + + if (!t->tx_buf) { + mspi->tx_dma = mspi->dma_dummy_tx; + mspi->map_tx_dma = 0; + } + + if (!t->rx_buf) { + mspi->rx_dma = mspi->dma_dummy_rx; + mspi->map_rx_dma = 0; + } + + if (mspi->map_tx_dma) { + void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */ + + mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, mspi->tx_dma)) { + dev_err(dev, "unable to map tx dma\n"); + return -ENOMEM; + } + } else if (t->tx_buf) { + mspi->tx_dma = t->tx_dma; + } + + if (mspi->map_rx_dma) { + mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len, + DMA_FROM_DEVICE); + if (dma_mapping_error(dev, mspi->rx_dma)) { + dev_err(dev, "unable to map rx dma\n"); + goto err_rx_dma; + } + } else if (t->rx_buf) { + mspi->rx_dma = t->rx_dma; + } + + /* enable rx ints */ + mpc8xxx_spi_write_reg(&mspi->base->mask, SPIE_RXB); + + mspi->xfer_in_progress = t; + mspi->count = t->len; + + /* start CPM transfers */ + fsl_spi_cpm_bufs_start(mspi); + + return 0; + +err_rx_dma: + if (mspi->map_tx_dma) + dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); + return -ENOMEM; +} + +static void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + struct spi_transfer *t = mspi->xfer_in_progress; + + if (mspi->map_tx_dma) + dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); + if (mspi->map_rx_dma) + dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE); + mspi->xfer_in_progress = NULL; +} + +int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, + unsigned int len) +{ + u32 word; + + mspi->count = len; + + /* enable rx ints */ + mpc8xxx_spi_write_reg(&mspi->base->mask, SPIM_NE); + + /* transmit word */ + word = mspi->get_tx(mspi); + mpc8xxx_spi_write_reg(&mspi->base->transmit, word); + + return 0; +} + +static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t, + bool is_dma_mapped) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + unsigned int len = t->len; + u8 bits_per_word; + int ret; + + bits_per_word = spi->bits_per_word; + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + + if (bits_per_word > 8) { + /* invalid length? */ + if (len & 1) + return -EINVAL; + len /= 2; + } + if (bits_per_word > 16) { + /* invalid length? */ + if (len & 1) + return -EINVAL; + len /= 2; + } + + mpc8xxx_spi->tx = t->tx_buf; + mpc8xxx_spi->rx = t->rx_buf; + + INIT_COMPLETION(mpc8xxx_spi->done); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); + else + ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len); + if (ret) + return ret; + + wait_for_completion(&mpc8xxx_spi->done); + + /* disable rx ints */ + mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + fsl_spi_cpm_bufs_complete(mpc8xxx_spi); + + return mpc8xxx_spi->count; +} + +static void fsl_spi_do_one_msg(struct spi_message *m) +{ + struct spi_device *spi = m->spi; + struct spi_transfer *t; + unsigned int cs_change; + const int nsecs = 50; + int status; + + cs_change = 1; + status = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->bits_per_word || t->speed_hz) { + /* Don't allow changes if CS is active */ + status = -EINVAL; + + if (cs_change) + status = fsl_spi_setup_transfer(spi, t); + if (status < 0) + break; + } + + if (cs_change) { + fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE); + ndelay(nsecs); + } + cs_change = t->cs_change; + if (t->len) + status = fsl_spi_bufs(spi, t, m->is_dma_mapped); + if (status) { + status = -EMSGSIZE; + break; + } + m->actual_length += t->len; + + if (t->delay_usecs) + udelay(t->delay_usecs); + + if (cs_change) { + ndelay(nsecs); + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + ndelay(nsecs); + } + } + + m->status = status; + m->complete(m->context); + + if (status || !cs_change) { + ndelay(nsecs); + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + } + + fsl_spi_setup_transfer(spi, NULL); +} + +static int fsl_spi_setup(struct spi_device *spi) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + int retval; + u32 hw_mode; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + if (!spi->max_speed_hz) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi->controller_state = cs; + } + mpc8xxx_spi = spi_master_get_devdata(spi->master); + + hw_mode = cs->hw_mode; /* Save original settings */ + cs->hw_mode = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode); + /* mask out bits we are going to set */ + cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH + | SPMODE_REV | SPMODE_LOOP); + + if (spi->mode & SPI_CPHA) + cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; + if (spi->mode & SPI_CPOL) + cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; + if (!(spi->mode & SPI_LSB_FIRST)) + cs->hw_mode |= SPMODE_REV; + if (spi->mode & SPI_LOOP) + cs->hw_mode |= SPMODE_LOOP; + + retval = fsl_spi_setup_transfer(spi, NULL); + if (retval < 0) { + cs->hw_mode = hw_mode; /* Restore settings */ + return retval; + } + return 0; +} + +static void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) +{ + u16 len; + + dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__, + in_be16(&mspi->rx_bd->cbd_datlen), mspi->count); + + len = in_be16(&mspi->rx_bd->cbd_datlen); + if (len > mspi->count) { + WARN_ON(1); + len = mspi->count; + } + + /* Clear the events */ + mpc8xxx_spi_write_reg(&mspi->base->event, events); + + mspi->count -= len; + if (mspi->count) + fsl_spi_cpm_bufs_start(mspi); + else + complete(&mspi->done); +} + +static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) +{ + /* We need handle RX first */ + if (events & SPIE_NE) { + u32 rx_data = mpc8xxx_spi_read_reg(&mspi->base->receive); + + if (mspi->rx) + mspi->get_rx(rx_data, mspi); + } + + if ((events & SPIE_NF) == 0) + /* spin until TX is done */ + while (((events = + mpc8xxx_spi_read_reg(&mspi->base->event)) & + SPIE_NF) == 0) + cpu_relax(); + + /* Clear the events */ + mpc8xxx_spi_write_reg(&mspi->base->event, events); + + mspi->count -= 1; + if (mspi->count) { + u32 word = mspi->get_tx(mspi); + + mpc8xxx_spi_write_reg(&mspi->base->transmit, word); + } else { + complete(&mspi->done); + } +} + +irqreturn_t fsl_spi_irq(s32 irq, void *context_data) +{ + struct mpc8xxx_spi *mspi = context_data; + irqreturn_t ret = IRQ_NONE; + u32 events; + + /* Get interrupt events(tx/rx) */ + events = mpc8xxx_spi_read_reg(&mspi->base->event); + if (events) + ret = IRQ_HANDLED; + + dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); + + if (mspi->flags & SPI_CPM_MODE) + fsl_spi_cpm_irq(mspi, events); + else + fsl_spi_cpu_irq(mspi, events); + + return ret; +} + +static void *fsl_spi_alloc_dummy_rx(void) +{ + mutex_lock(&fsl_dummy_rx_lock); + + if (!fsl_dummy_rx) + fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL); + if (fsl_dummy_rx) + fsl_dummy_rx_refcnt++; + + mutex_unlock(&fsl_dummy_rx_lock); + + return fsl_dummy_rx; +} + +static void fsl_spi_free_dummy_rx(void) +{ + mutex_lock(&fsl_dummy_rx_lock); + + switch (fsl_dummy_rx_refcnt) { + case 0: + WARN_ON(1); + break; + case 1: + kfree(fsl_dummy_rx); + fsl_dummy_rx = NULL; + /* fall through */ + default: + fsl_dummy_rx_refcnt--; + break; + } + + mutex_unlock(&fsl_dummy_rx_lock); +} + +static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + struct device_node *np = dev->of_node; + const u32 *iprop; + int size; + unsigned long spi_base_ofs; + unsigned long pram_ofs = -ENOMEM; + + /* Can't use of_address_to_resource(), QE muram isn't at 0. */ + iprop = of_get_property(np, "reg", &size); + + /* QE with a fixed pram location? */ + if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4) + return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE); + + /* QE but with a dynamic pram location? */ + if (mspi->flags & SPI_QE) { + pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); + qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock, + QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs); + return pram_ofs; + } + + /* CPM1 and CPM2 pram must be at a fixed addr. */ + if (!iprop || size != sizeof(*iprop) * 4) + return -ENOMEM; + + spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2); + if (IS_ERR_VALUE(spi_base_ofs)) + return -ENOMEM; + + if (mspi->flags & SPI_CPM2) { + pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); + if (!IS_ERR_VALUE(pram_ofs)) { + u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs); + + out_be16(spi_base, pram_ofs); + } + } else { + struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs); + u16 rpbase = in_be16(&pram->rpbase); + + /* Microcode relocation patch applied? */ + if (rpbase) + pram_ofs = rpbase; + else + return spi_base_ofs; + } + + cpm_muram_free(spi_base_ofs); + return pram_ofs; +} + +static int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + struct device_node *np = dev->of_node; + const u32 *iprop; + int size; + unsigned long pram_ofs; + unsigned long bds_ofs; + + if (!(mspi->flags & SPI_CPM_MODE)) + return 0; + + if (!fsl_spi_alloc_dummy_rx()) + return -ENOMEM; + + if (mspi->flags & SPI_QE) { + iprop = of_get_property(np, "cell-index", &size); + if (iprop && size == sizeof(*iprop)) + mspi->subblock = *iprop; + + switch (mspi->subblock) { + default: + dev_warn(dev, "cell-index unspecified, assuming SPI1"); + /* fall through */ + case 0: + mspi->subblock = QE_CR_SUBBLOCK_SPI1; + break; + case 1: + mspi->subblock = QE_CR_SUBBLOCK_SPI2; + break; + } + } + + pram_ofs = fsl_spi_cpm_get_pram(mspi); + if (IS_ERR_VALUE(pram_ofs)) { + dev_err(dev, "can't allocate spi parameter ram\n"); + goto err_pram; + } + + bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) + + sizeof(*mspi->rx_bd), 8); + if (IS_ERR_VALUE(bds_ofs)) { + dev_err(dev, "can't allocate bds\n"); + goto err_bds; + } + + mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, mspi->dma_dummy_tx)) { + dev_err(dev, "unable to map dummy tx buffer\n"); + goto err_dummy_tx; + } + + mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR, + DMA_FROM_DEVICE); + if (dma_mapping_error(dev, mspi->dma_dummy_rx)) { + dev_err(dev, "unable to map dummy rx buffer\n"); + goto err_dummy_rx; + } + + mspi->pram = cpm_muram_addr(pram_ofs); + + mspi->tx_bd = cpm_muram_addr(bds_ofs); + mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd)); + + /* Initialize parameter ram. */ + out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd)); + out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd)); + out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL); + out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL); + out_be16(&mspi->pram->mrblr, SPI_MRBLR); + out_be32(&mspi->pram->rstate, 0); + out_be32(&mspi->pram->rdp, 0); + out_be16(&mspi->pram->rbptr, 0); + out_be16(&mspi->pram->rbc, 0); + out_be32(&mspi->pram->rxtmp, 0); + out_be32(&mspi->pram->tstate, 0); + out_be32(&mspi->pram->tdp, 0); + out_be16(&mspi->pram->tbptr, 0); + out_be16(&mspi->pram->tbc, 0); + out_be32(&mspi->pram->txtmp, 0); + + return 0; + +err_dummy_rx: + dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); +err_dummy_tx: + cpm_muram_free(bds_ofs); +err_bds: + cpm_muram_free(pram_ofs); +err_pram: + fsl_spi_free_dummy_rx(); + return -ENOMEM; +} + +static void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi) +{ + struct device *dev = mspi->dev; + + dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE); + dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); + cpm_muram_free(cpm_muram_offset(mspi->tx_bd)); + cpm_muram_free(cpm_muram_offset(mspi->pram)); + fsl_spi_free_dummy_rx(); +} + +static void fsl_spi_remove(struct mpc8xxx_spi *mspi) +{ + iounmap(mspi->base); + fsl_spi_cpm_free(mspi); +} + +static struct spi_master * __devinit fsl_spi_probe(struct device *dev, + struct resource *mem, unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct spi_master *master; + struct mpc8xxx_spi *mpc8xxx_spi; + u32 regval; + int ret = 0; + + master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); + if (master == NULL) { + ret = -ENOMEM; + goto err; + } + + dev_set_drvdata(dev, master); + + ret = mpc8xxx_spi_probe(dev, mem, irq); + if (ret) + goto err_probe; + + master->setup = fsl_spi_setup; + + mpc8xxx_spi = spi_master_get_devdata(master); + mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg; + mpc8xxx_spi->spi_remove = fsl_spi_remove; + + mpc8xxx_spi->base = ioremap(mem->start, resource_size(mem)); + if (mpc8xxx_spi->base == NULL) { + ret = -ENOMEM; + goto err_probe; + } + + /* Register for SPI Interrupt */ + ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq, + 0, "fsl_spi", mpc8xxx_spi); + + if (ret != 0) + goto err_free_irq; + + /* CPM init */ + ret = fsl_spi_cpm_init(mpc8xxx_spi); + if (ret) + goto err_cpm_init; + + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { + mpc8xxx_spi->rx_shift = 16; + mpc8xxx_spi->tx_shift = 24; + } + + /* SPI controller initializations */ + mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, 0); + mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0); + mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->command, 0); + mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->event, 0xffffffff); + + /* Enable SPI interface */ + regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) + regval |= SPMODE_OP; + mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, regval); + + ret = spi_register_master(master); + if (ret < 0) + goto unreg_master; + + dev_info(dev, "at 0x%p (irq = %d), %s mode\n", mpc8xxx_spi->base, + mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); + + return master; + +unreg_master: + fsl_spi_cpm_free(mpc8xxx_spi); +err_cpm_init: + free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); +err_free_irq: + iounmap(mpc8xxx_spi->base); +err_probe: + spi_master_put(master); +err: + return ERR_PTR(ret); +} + +static void fsl_spi_cs_control(struct spi_device *spi, bool on) +{ + struct device *dev = spi->dev.parent; + struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data); + u16 cs = spi->chip_select; + int gpio = pinfo->gpios[cs]; + bool alow = pinfo->alow_flags[cs]; + + gpio_set_value(gpio, on ^ alow); +} + +static int of_fsl_spi_get_chipselects(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); + unsigned int ngpios; + int i = 0; + int ret; + + ngpios = of_gpio_count(np); + if (!ngpios) { + /* + * SPI w/o chip-select line. One SPI device is still permitted + * though. + */ + pdata->max_chipselect = 1; + return 0; + } + + pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL); + if (!pinfo->gpios) + return -ENOMEM; + memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios)); + + pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags), + GFP_KERNEL); + if (!pinfo->alow_flags) { + ret = -ENOMEM; + goto err_alloc_flags; + } + + for (; i < ngpios; i++) { + int gpio; + enum of_gpio_flags flags; + + gpio = of_get_gpio_flags(np, i, &flags); + if (!gpio_is_valid(gpio)) { + dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); + ret = gpio; + goto err_loop; + } + + ret = gpio_request(gpio, dev_name(dev)); + if (ret) { + dev_err(dev, "can't request gpio #%d: %d\n", i, ret); + goto err_loop; + } + + pinfo->gpios[i] = gpio; + pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW; + + ret = gpio_direction_output(pinfo->gpios[i], + pinfo->alow_flags[i]); + if (ret) { + dev_err(dev, "can't set output direction for gpio " + "#%d: %d\n", i, ret); + goto err_loop; + } + } + + pdata->max_chipselect = ngpios; + pdata->cs_control = fsl_spi_cs_control; + + return 0; + +err_loop: + while (i >= 0) { + if (gpio_is_valid(pinfo->gpios[i])) + gpio_free(pinfo->gpios[i]); + i--; + } + + kfree(pinfo->alow_flags); + pinfo->alow_flags = NULL; +err_alloc_flags: + kfree(pinfo->gpios); + pinfo->gpios = NULL; + return ret; +} + +static int of_fsl_spi_free_chipselects(struct device *dev) +{ + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); + int i; + + if (!pinfo->gpios) + return 0; + + for (i = 0; i < pdata->max_chipselect; i++) { + if (gpio_is_valid(pinfo->gpios[i])) + gpio_free(pinfo->gpios[i]); + } + + kfree(pinfo->gpios); + kfree(pinfo->alow_flags); + return 0; +} + +static int __devinit of_fsl_spi_probe(struct of_device *ofdev, + const struct of_device_id *ofid) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct spi_master *master; + struct resource mem; + struct resource irq; + int ret = -ENOMEM; + + ret = of_mpc8xxx_spi_probe(ofdev, ofid); + if (ret) + return ret; + + ret = of_fsl_spi_get_chipselects(dev); + if (ret) + goto err; + + ret = of_address_to_resource(np, 0, &mem); + if (ret) + goto err; + + ret = of_irq_to_resource(np, 0, &irq); + if (!ret) { + ret = -EINVAL; + goto err; + } + + master = fsl_spi_probe(dev, &mem, irq.start); + if (IS_ERR(master)) { + ret = PTR_ERR(master); + goto err; + } + + of_register_spi_devices(master, np); + + return 0; + +err: + of_fsl_spi_free_chipselects(dev); + return ret; +} + +static int __devexit of_fsl_spi_remove(struct of_device *ofdev) +{ + int ret; + + ret = mpc8xxx_spi_remove(&ofdev->dev); + if (ret) + return ret; + of_fsl_spi_free_chipselects(&ofdev->dev); + return 0; +} + +static const struct of_device_id of_fsl_spi_match[] = { + { .compatible = "fsl,spi" }, + {} +}; +MODULE_DEVICE_TABLE(of, of_fsl_spi_match); + +static struct of_platform_driver of_fsl_spi_driver = { + .driver = { + .name = "fsl_spi", + .owner = THIS_MODULE, + .of_match_table = of_fsl_spi_match, + }, + .probe = of_fsl_spi_probe, + .remove = __devexit_p(of_fsl_spi_remove), +}; + +#ifdef CONFIG_MPC832x_RDB +/* + * XXX XXX XXX + * This is "legacy" platform driver, was used by the MPC8323E-RDB boards + * only. The driver should go away soon, since newer MPC8323E-RDB's device + * tree can work with OpenFirmware driver. But for now we support old trees + * as well. + */ +static int __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev) +{ + struct resource *mem; + int irq; + struct spi_master *master; + + if (!pdev->dev.platform_data) + return -EINVAL; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + return -EINVAL; + + master = fsl_spi_probe(&pdev->dev, mem, irq); + if (IS_ERR(master)) + return PTR_ERR(master); + return 0; +} + +static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev) +{ + return mpc8xxx_spi_remove(&pdev->dev); +} + +MODULE_ALIAS("platform:mpc8xxx_spi"); +static struct platform_driver mpc8xxx_spi_driver = { + .probe = plat_mpc8xxx_spi_probe, + .remove = __devexit_p(plat_mpc8xxx_spi_remove), + .driver = { + .name = "mpc8xxx_spi", + .owner = THIS_MODULE, + }, +}; + +static bool legacy_driver_failed; + +static void __init legacy_driver_register(void) +{ + legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); +} + +static void __exit legacy_driver_unregister(void) +{ + if (legacy_driver_failed) + return; + platform_driver_unregister(&mpc8xxx_spi_driver); +} +#else +static void __init legacy_driver_register(void) {} +static void __exit legacy_driver_unregister(void) {} +#endif /* CONFIG_MPC832x_RDB */ + +static int __init fsl_spi_init(void) +{ + legacy_driver_register(); + return of_register_platform_driver(&of_fsl_spi_driver); +} +module_init(fsl_spi_init); + +static void __exit fsl_spi_exit(void) +{ + of_unregister_platform_driver(&of_fsl_spi_driver); + legacy_driver_unregister(); +} +module_exit(fsl_spi_exit); + +MODULE_AUTHOR("Kumar Gala"); +MODULE_DESCRIPTION("Simple Freescale SPI Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c deleted file mode 100644 index 97ab0a8..0000000 --- a/drivers/spi/spi_mpc8xxx.c +++ /dev/null @@ -1,1421 +0,0 @@ -/* - * MPC8xxx SPI controller driver. - * - * Maintainer: Kumar Gala - * - * Copyright (C) 2006 Polycom, Inc. - * - * CPM SPI and QE buffer descriptors mode support: - * Copyright (c) 2009 MontaVista Software, Inc. - * Author: Anton Vorontsov - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -/* CPM1 and CPM2 are mutually exclusive. */ -#ifdef CONFIG_CPM1 -#include -#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0) -#else -#include -#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0) -#endif - -/* SPI Controller registers */ -struct mpc8xxx_spi_reg { - u8 res1[0x20]; - __be32 mode; - __be32 event; - __be32 mask; - __be32 command; - __be32 transmit; - __be32 receive; -}; - -/* SPI Controller mode register definitions */ -#define SPMODE_LOOP (1 << 30) -#define SPMODE_CI_INACTIVEHIGH (1 << 29) -#define SPMODE_CP_BEGIN_EDGECLK (1 << 28) -#define SPMODE_DIV16 (1 << 27) -#define SPMODE_REV (1 << 26) -#define SPMODE_MS (1 << 25) -#define SPMODE_ENABLE (1 << 24) -#define SPMODE_LEN(x) ((x) << 20) -#define SPMODE_PM(x) ((x) << 16) -#define SPMODE_OP (1 << 14) -#define SPMODE_CG(x) ((x) << 7) - -/* - * Default for SPI Mode: - * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk - */ -#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \ - SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf)) - -/* SPIE register values */ -#define SPIE_NE 0x00000200 /* Not empty */ -#define SPIE_NF 0x00000100 /* Not full */ - -/* SPIM register values */ -#define SPIM_NE 0x00000200 /* Not empty */ -#define SPIM_NF 0x00000100 /* Not full */ - -#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */ -#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */ - -/* SPCOM register values */ -#define SPCOM_STR (1 << 23) /* Start transmit */ - -#define SPI_PRAM_SIZE 0x100 -#define SPI_MRBLR ((unsigned int)PAGE_SIZE) - -/* SPI Controller driver's private data. */ -struct mpc8xxx_spi { - struct device *dev; - struct mpc8xxx_spi_reg __iomem *base; - - /* rx & tx bufs from the spi_transfer */ - const void *tx; - void *rx; - - int subblock; - struct spi_pram __iomem *pram; - struct cpm_buf_desc __iomem *tx_bd; - struct cpm_buf_desc __iomem *rx_bd; - - struct spi_transfer *xfer_in_progress; - - /* dma addresses for CPM transfers */ - dma_addr_t tx_dma; - dma_addr_t rx_dma; - bool map_tx_dma; - bool map_rx_dma; - - dma_addr_t dma_dummy_tx; - dma_addr_t dma_dummy_rx; - - /* functions to deal with different sized buffers */ - void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); - u32(*get_tx) (struct mpc8xxx_spi *); - - unsigned int count; - unsigned int irq; - - unsigned nsecs; /* (clock cycle time)/2 */ - - u32 spibrg; /* SPIBRG input clock */ - u32 rx_shift; /* RX data reg shift when in qe mode */ - u32 tx_shift; /* TX data reg shift when in qe mode */ - - unsigned int flags; - - struct workqueue_struct *workqueue; - struct work_struct work; - - struct list_head queue; - spinlock_t lock; - - struct completion done; -}; - -static void *mpc8xxx_dummy_rx; -static DEFINE_MUTEX(mpc8xxx_dummy_rx_lock); -static int mpc8xxx_dummy_rx_refcnt; - -struct spi_mpc8xxx_cs { - /* functions to deal with different sized buffers */ - void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); - u32 (*get_tx) (struct mpc8xxx_spi *); - u32 rx_shift; /* RX data reg shift when in qe mode */ - u32 tx_shift; /* TX data reg shift when in qe mode */ - u32 hw_mode; /* Holds HW mode register settings */ -}; - -static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val) -{ - out_be32(reg, val); -} - -static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg) -{ - return in_be32(reg); -} - -#define MPC83XX_SPI_RX_BUF(type) \ -static \ -void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ -{ \ - type *rx = mpc8xxx_spi->rx; \ - *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ - mpc8xxx_spi->rx = rx; \ -} - -#define MPC83XX_SPI_TX_BUF(type) \ -static \ -u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ -{ \ - u32 data; \ - const type *tx = mpc8xxx_spi->tx; \ - if (!tx) \ - return 0; \ - data = *tx++ << mpc8xxx_spi->tx_shift; \ - mpc8xxx_spi->tx = tx; \ - return data; \ -} - -MPC83XX_SPI_RX_BUF(u8) -MPC83XX_SPI_RX_BUF(u16) -MPC83XX_SPI_RX_BUF(u32) -MPC83XX_SPI_TX_BUF(u8) -MPC83XX_SPI_TX_BUF(u16) -MPC83XX_SPI_TX_BUF(u32) - -static void mpc8xxx_spi_change_mode(struct spi_device *spi) -{ - struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); - struct spi_mpc8xxx_cs *cs = spi->controller_state; - __be32 __iomem *mode = &mspi->base->mode; - unsigned long flags; - - if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) - return; - - /* Turn off IRQs locally to minimize time that SPI is disabled. */ - local_irq_save(flags); - - /* Turn off SPI unit prior changing mode */ - mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); - - /* When in CPM mode, we need to reinit tx and rx. */ - if (mspi->flags & SPI_CPM_MODE) { - if (mspi->flags & SPI_QE) { - qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock, - QE_CR_PROTOCOL_UNSPECIFIED, 0); - } else { - cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX); - if (mspi->flags & SPI_CPM1) { - out_be16(&mspi->pram->rbptr, - in_be16(&mspi->pram->rbase)); - out_be16(&mspi->pram->tbptr, - in_be16(&mspi->pram->tbase)); - } - } - } - mpc8xxx_spi_write_reg(mode, cs->hw_mode); - local_irq_restore(flags); -} - -static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value) -{ - struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); - struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data; - bool pol = spi->mode & SPI_CS_HIGH; - struct spi_mpc8xxx_cs *cs = spi->controller_state; - - if (value == BITBANG_CS_INACTIVE) { - if (pdata->cs_control) - pdata->cs_control(spi, !pol); - } - - if (value == BITBANG_CS_ACTIVE) { - mpc8xxx_spi->rx_shift = cs->rx_shift; - mpc8xxx_spi->tx_shift = cs->tx_shift; - mpc8xxx_spi->get_rx = cs->get_rx; - mpc8xxx_spi->get_tx = cs->get_tx; - - mpc8xxx_spi_change_mode(spi); - - if (pdata->cs_control) - pdata->cs_control(spi, pol); - } -} - -static int -mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, - struct spi_device *spi, - struct mpc8xxx_spi *mpc8xxx_spi, - int bits_per_word) -{ - cs->rx_shift = 0; - cs->tx_shift = 0; - if (bits_per_word <= 8) { - cs->get_rx = mpc8xxx_spi_rx_buf_u8; - cs->get_tx = mpc8xxx_spi_tx_buf_u8; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { - cs->rx_shift = 16; - cs->tx_shift = 24; - } - } else if (bits_per_word <= 16) { - cs->get_rx = mpc8xxx_spi_rx_buf_u16; - cs->get_tx = mpc8xxx_spi_tx_buf_u16; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { - cs->rx_shift = 16; - cs->tx_shift = 16; - } - } else if (bits_per_word <= 32) { - cs->get_rx = mpc8xxx_spi_rx_buf_u32; - cs->get_tx = mpc8xxx_spi_tx_buf_u32; - } else - return -EINVAL; - - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE && - spi->mode & SPI_LSB_FIRST) { - cs->tx_shift = 0; - if (bits_per_word <= 8) - cs->rx_shift = 8; - else - cs->rx_shift = 0; - } - mpc8xxx_spi->rx_shift = cs->rx_shift; - mpc8xxx_spi->tx_shift = cs->tx_shift; - mpc8xxx_spi->get_rx = cs->get_rx; - mpc8xxx_spi->get_tx = cs->get_tx; - - return bits_per_word; -} - -static int -mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, - struct spi_device *spi, - int bits_per_word) -{ - /* QE uses Little Endian for words > 8 - * so transform all words > 8 into 8 bits - * Unfortnatly that doesn't work for LSB so - * reject these for now */ - /* Note: 32 bits word, LSB works iff - * tfcr/rfcr is set to CPMFCR_GBL */ - if (spi->mode & SPI_LSB_FIRST && - bits_per_word > 8) - return -EINVAL; - if (bits_per_word > 8) - return 8; /* pretend its 8 bits */ - return bits_per_word; -} - -static -int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) -{ - struct mpc8xxx_spi *mpc8xxx_spi; - int bits_per_word; - u8 pm; - u32 hz; - struct spi_mpc8xxx_cs *cs = spi->controller_state; - - mpc8xxx_spi = spi_master_get_devdata(spi->master); - - if (t) { - bits_per_word = t->bits_per_word; - hz = t->speed_hz; - } else { - bits_per_word = 0; - hz = 0; - } - - /* spi_transfer level calls that work per-word */ - if (!bits_per_word) - bits_per_word = spi->bits_per_word; - - /* Make sure its a bit width we support [4..16, 32] */ - if ((bits_per_word < 4) - || ((bits_per_word > 16) && (bits_per_word != 32))) - return -EINVAL; - - if (!hz) - hz = spi->max_speed_hz; - - if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) - bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, - mpc8xxx_spi, - bits_per_word); - else if (mpc8xxx_spi->flags & SPI_QE) - bits_per_word = mspi_apply_qe_mode_quirks(cs, spi, - bits_per_word); - - if (bits_per_word < 0) - return bits_per_word; - - if (bits_per_word == 32) - bits_per_word = 0; - else - bits_per_word = bits_per_word - 1; - - /* mask out bits we are going to set */ - cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 - | SPMODE_PM(0xF)); - - cs->hw_mode |= SPMODE_LEN(bits_per_word); - - if ((mpc8xxx_spi->spibrg / hz) > 64) { - cs->hw_mode |= SPMODE_DIV16; - pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; - - WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " - "Will use %d Hz instead.\n", dev_name(&spi->dev), - hz, mpc8xxx_spi->spibrg / 1024); - if (pm > 16) - pm = 16; - } else - pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; - if (pm) - pm--; - - cs->hw_mode |= SPMODE_PM(pm); - - mpc8xxx_spi_change_mode(spi); - return 0; -} - -static void mpc8xxx_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) -{ - struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd; - struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd; - unsigned int xfer_len = min(mspi->count, SPI_MRBLR); - unsigned int xfer_ofs; - - xfer_ofs = mspi->xfer_in_progress->len - mspi->count; - - out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs); - out_be16(&rx_bd->cbd_datlen, 0); - out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP); - - out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs); - out_be16(&tx_bd->cbd_datlen, xfer_len); - out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | - BD_SC_LAST); - - /* start transfer */ - mpc8xxx_spi_write_reg(&mspi->base->command, SPCOM_STR); -} - -static int mpc8xxx_spi_cpm_bufs(struct mpc8xxx_spi *mspi, - struct spi_transfer *t, bool is_dma_mapped) -{ - struct device *dev = mspi->dev; - - if (is_dma_mapped) { - mspi->map_tx_dma = 0; - mspi->map_rx_dma = 0; - } else { - mspi->map_tx_dma = 1; - mspi->map_rx_dma = 1; - } - - if (!t->tx_buf) { - mspi->tx_dma = mspi->dma_dummy_tx; - mspi->map_tx_dma = 0; - } - - if (!t->rx_buf) { - mspi->rx_dma = mspi->dma_dummy_rx; - mspi->map_rx_dma = 0; - } - - if (mspi->map_tx_dma) { - void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */ - - mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len, - DMA_TO_DEVICE); - if (dma_mapping_error(dev, mspi->tx_dma)) { - dev_err(dev, "unable to map tx dma\n"); - return -ENOMEM; - } - } else if (t->tx_buf) { - mspi->tx_dma = t->tx_dma; - } - - if (mspi->map_rx_dma) { - mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len, - DMA_FROM_DEVICE); - if (dma_mapping_error(dev, mspi->rx_dma)) { - dev_err(dev, "unable to map rx dma\n"); - goto err_rx_dma; - } - } else if (t->rx_buf) { - mspi->rx_dma = t->rx_dma; - } - - /* enable rx ints */ - mpc8xxx_spi_write_reg(&mspi->base->mask, SPIE_RXB); - - mspi->xfer_in_progress = t; - mspi->count = t->len; - - /* start CPM transfers */ - mpc8xxx_spi_cpm_bufs_start(mspi); - - return 0; - -err_rx_dma: - if (mspi->map_tx_dma) - dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); - return -ENOMEM; -} - -static void mpc8xxx_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) -{ - struct device *dev = mspi->dev; - struct spi_transfer *t = mspi->xfer_in_progress; - - if (mspi->map_tx_dma) - dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); - if (mspi->map_rx_dma) - dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE); - mspi->xfer_in_progress = NULL; -} - -static int mpc8xxx_spi_cpu_bufs(struct mpc8xxx_spi *mspi, - struct spi_transfer *t, unsigned int len) -{ - u32 word; - - mspi->count = len; - - /* enable rx ints */ - mpc8xxx_spi_write_reg(&mspi->base->mask, SPIM_NE); - - /* transmit word */ - word = mspi->get_tx(mspi); - mpc8xxx_spi_write_reg(&mspi->base->transmit, word); - - return 0; -} - -static int mpc8xxx_spi_bufs(struct spi_device *spi, struct spi_transfer *t, - bool is_dma_mapped) -{ - struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); - unsigned int len = t->len; - u8 bits_per_word; - int ret; - - bits_per_word = spi->bits_per_word; - if (t->bits_per_word) - bits_per_word = t->bits_per_word; - - if (bits_per_word > 8) { - /* invalid length? */ - if (len & 1) - return -EINVAL; - len /= 2; - } - if (bits_per_word > 16) { - /* invalid length? */ - if (len & 1) - return -EINVAL; - len /= 2; - } - - mpc8xxx_spi->tx = t->tx_buf; - mpc8xxx_spi->rx = t->rx_buf; - - INIT_COMPLETION(mpc8xxx_spi->done); - - if (mpc8xxx_spi->flags & SPI_CPM_MODE) - ret = mpc8xxx_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); - else - ret = mpc8xxx_spi_cpu_bufs(mpc8xxx_spi, t, len); - if (ret) - return ret; - - wait_for_completion(&mpc8xxx_spi->done); - - /* disable rx ints */ - mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0); - - if (mpc8xxx_spi->flags & SPI_CPM_MODE) - mpc8xxx_spi_cpm_bufs_complete(mpc8xxx_spi); - - return mpc8xxx_spi->count; -} - -static void mpc8xxx_spi_do_one_msg(struct spi_message *m) -{ - struct spi_device *spi = m->spi; - struct spi_transfer *t; - unsigned int cs_change; - const int nsecs = 50; - int status; - - cs_change = 1; - status = 0; - list_for_each_entry(t, &m->transfers, transfer_list) { - if (t->bits_per_word || t->speed_hz) { - /* Don't allow changes if CS is active */ - status = -EINVAL; - - if (cs_change) - status = mpc8xxx_spi_setup_transfer(spi, t); - if (status < 0) - break; - } - - if (cs_change) { - mpc8xxx_spi_chipselect(spi, BITBANG_CS_ACTIVE); - ndelay(nsecs); - } - cs_change = t->cs_change; - if (t->len) - status = mpc8xxx_spi_bufs(spi, t, m->is_dma_mapped); - if (status) { - status = -EMSGSIZE; - break; - } - m->actual_length += t->len; - - if (t->delay_usecs) - udelay(t->delay_usecs); - - if (cs_change) { - ndelay(nsecs); - mpc8xxx_spi_chipselect(spi, BITBANG_CS_INACTIVE); - ndelay(nsecs); - } - } - - m->status = status; - m->complete(m->context); - - if (status || !cs_change) { - ndelay(nsecs); - mpc8xxx_spi_chipselect(spi, BITBANG_CS_INACTIVE); - } - - mpc8xxx_spi_setup_transfer(spi, NULL); -} - -static void mpc8xxx_spi_work(struct work_struct *work) -{ - struct mpc8xxx_spi *mpc8xxx_spi = container_of(work, struct mpc8xxx_spi, - work); - - spin_lock_irq(&mpc8xxx_spi->lock); - while (!list_empty(&mpc8xxx_spi->queue)) { - struct spi_message *m = container_of(mpc8xxx_spi->queue.next, - struct spi_message, queue); - - list_del_init(&m->queue); - spin_unlock_irq(&mpc8xxx_spi->lock); - - mpc8xxx_spi_do_one_msg(m); - - spin_lock_irq(&mpc8xxx_spi->lock); - } - spin_unlock_irq(&mpc8xxx_spi->lock); -} - -static int mpc8xxx_spi_setup(struct spi_device *spi) -{ - struct mpc8xxx_spi *mpc8xxx_spi; - int retval; - u32 hw_mode; - struct spi_mpc8xxx_cs *cs = spi->controller_state; - - if (!spi->max_speed_hz) - return -EINVAL; - - if (!cs) { - cs = kzalloc(sizeof *cs, GFP_KERNEL); - if (!cs) - return -ENOMEM; - spi->controller_state = cs; - } - mpc8xxx_spi = spi_master_get_devdata(spi->master); - - hw_mode = cs->hw_mode; /* Save original settings */ - cs->hw_mode = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode); - /* mask out bits we are going to set */ - cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH - | SPMODE_REV | SPMODE_LOOP); - - if (spi->mode & SPI_CPHA) - cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; - if (spi->mode & SPI_CPOL) - cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; - if (!(spi->mode & SPI_LSB_FIRST)) - cs->hw_mode |= SPMODE_REV; - if (spi->mode & SPI_LOOP) - cs->hw_mode |= SPMODE_LOOP; - - retval = mpc8xxx_spi_setup_transfer(spi, NULL); - if (retval < 0) { - cs->hw_mode = hw_mode; /* Restore settings */ - return retval; - } - return 0; -} - -static void mpc8xxx_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) -{ - u16 len; - - dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__, - in_be16(&mspi->rx_bd->cbd_datlen), mspi->count); - - len = in_be16(&mspi->rx_bd->cbd_datlen); - if (len > mspi->count) { - WARN_ON(1); - len = mspi->count; - } - - /* Clear the events */ - mpc8xxx_spi_write_reg(&mspi->base->event, events); - - mspi->count -= len; - if (mspi->count) - mpc8xxx_spi_cpm_bufs_start(mspi); - else - complete(&mspi->done); -} - -static void mpc8xxx_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) -{ - /* We need handle RX first */ - if (events & SPIE_NE) { - u32 rx_data = mpc8xxx_spi_read_reg(&mspi->base->receive); - - if (mspi->rx) - mspi->get_rx(rx_data, mspi); - } - - if ((events & SPIE_NF) == 0) - /* spin until TX is done */ - while (((events = - mpc8xxx_spi_read_reg(&mspi->base->event)) & - SPIE_NF) == 0) - cpu_relax(); - - /* Clear the events */ - mpc8xxx_spi_write_reg(&mspi->base->event, events); - - mspi->count -= 1; - if (mspi->count) { - u32 word = mspi->get_tx(mspi); - - mpc8xxx_spi_write_reg(&mspi->base->transmit, word); - } else { - complete(&mspi->done); - } -} - -static irqreturn_t mpc8xxx_spi_irq(s32 irq, void *context_data) -{ - struct mpc8xxx_spi *mspi = context_data; - irqreturn_t ret = IRQ_NONE; - u32 events; - - /* Get interrupt events(tx/rx) */ - events = mpc8xxx_spi_read_reg(&mspi->base->event); - if (events) - ret = IRQ_HANDLED; - - dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); - - if (mspi->flags & SPI_CPM_MODE) - mpc8xxx_spi_cpm_irq(mspi, events); - else - mpc8xxx_spi_cpu_irq(mspi, events); - - return ret; -} - -static int mpc8xxx_spi_transfer(struct spi_device *spi, - struct spi_message *m) -{ - struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); - unsigned long flags; - - m->actual_length = 0; - m->status = -EINPROGRESS; - - spin_lock_irqsave(&mpc8xxx_spi->lock, flags); - list_add_tail(&m->queue, &mpc8xxx_spi->queue); - queue_work(mpc8xxx_spi->workqueue, &mpc8xxx_spi->work); - spin_unlock_irqrestore(&mpc8xxx_spi->lock, flags); - - return 0; -} - - -static void mpc8xxx_spi_cleanup(struct spi_device *spi) -{ - kfree(spi->controller_state); -} - -static void *mpc8xxx_spi_alloc_dummy_rx(void) -{ - mutex_lock(&mpc8xxx_dummy_rx_lock); - - if (!mpc8xxx_dummy_rx) - mpc8xxx_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL); - if (mpc8xxx_dummy_rx) - mpc8xxx_dummy_rx_refcnt++; - - mutex_unlock(&mpc8xxx_dummy_rx_lock); - - return mpc8xxx_dummy_rx; -} - -static void mpc8xxx_spi_free_dummy_rx(void) -{ - mutex_lock(&mpc8xxx_dummy_rx_lock); - - switch (mpc8xxx_dummy_rx_refcnt) { - case 0: - WARN_ON(1); - break; - case 1: - kfree(mpc8xxx_dummy_rx); - mpc8xxx_dummy_rx = NULL; - /* fall through */ - default: - mpc8xxx_dummy_rx_refcnt--; - break; - } - - mutex_unlock(&mpc8xxx_dummy_rx_lock); -} - -static unsigned long mpc8xxx_spi_cpm_get_pram(struct mpc8xxx_spi *mspi) -{ - struct device *dev = mspi->dev; - struct device_node *np = dev->of_node; - const u32 *iprop; - int size; - unsigned long spi_base_ofs; - unsigned long pram_ofs = -ENOMEM; - - /* Can't use of_address_to_resource(), QE muram isn't at 0. */ - iprop = of_get_property(np, "reg", &size); - - /* QE with a fixed pram location? */ - if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4) - return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE); - - /* QE but with a dynamic pram location? */ - if (mspi->flags & SPI_QE) { - pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); - qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock, - QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs); - return pram_ofs; - } - - /* CPM1 and CPM2 pram must be at a fixed addr. */ - if (!iprop || size != sizeof(*iprop) * 4) - return -ENOMEM; - - spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2); - if (IS_ERR_VALUE(spi_base_ofs)) - return -ENOMEM; - - if (mspi->flags & SPI_CPM2) { - pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); - if (!IS_ERR_VALUE(pram_ofs)) { - u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs); - - out_be16(spi_base, pram_ofs); - } - } else { - struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs); - u16 rpbase = in_be16(&pram->rpbase); - - /* Microcode relocation patch applied? */ - if (rpbase) - pram_ofs = rpbase; - else - return spi_base_ofs; - } - - cpm_muram_free(spi_base_ofs); - return pram_ofs; -} - -static int mpc8xxx_spi_cpm_init(struct mpc8xxx_spi *mspi) -{ - struct device *dev = mspi->dev; - struct device_node *np = dev->of_node; - const u32 *iprop; - int size; - unsigned long pram_ofs; - unsigned long bds_ofs; - - if (!(mspi->flags & SPI_CPM_MODE)) - return 0; - - if (!mpc8xxx_spi_alloc_dummy_rx()) - return -ENOMEM; - - if (mspi->flags & SPI_QE) { - iprop = of_get_property(np, "cell-index", &size); - if (iprop && size == sizeof(*iprop)) - mspi->subblock = *iprop; - - switch (mspi->subblock) { - default: - dev_warn(dev, "cell-index unspecified, assuming SPI1"); - /* fall through */ - case 0: - mspi->subblock = QE_CR_SUBBLOCK_SPI1; - break; - case 1: - mspi->subblock = QE_CR_SUBBLOCK_SPI2; - break; - } - } - - pram_ofs = mpc8xxx_spi_cpm_get_pram(mspi); - if (IS_ERR_VALUE(pram_ofs)) { - dev_err(dev, "can't allocate spi parameter ram\n"); - goto err_pram; - } - - bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) + - sizeof(*mspi->rx_bd), 8); - if (IS_ERR_VALUE(bds_ofs)) { - dev_err(dev, "can't allocate bds\n"); - goto err_bds; - } - - mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE, - DMA_TO_DEVICE); - if (dma_mapping_error(dev, mspi->dma_dummy_tx)) { - dev_err(dev, "unable to map dummy tx buffer\n"); - goto err_dummy_tx; - } - - mspi->dma_dummy_rx = dma_map_single(dev, mpc8xxx_dummy_rx, SPI_MRBLR, - DMA_FROM_DEVICE); - if (dma_mapping_error(dev, mspi->dma_dummy_rx)) { - dev_err(dev, "unable to map dummy rx buffer\n"); - goto err_dummy_rx; - } - - mspi->pram = cpm_muram_addr(pram_ofs); - - mspi->tx_bd = cpm_muram_addr(bds_ofs); - mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd)); - - /* Initialize parameter ram. */ - out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd)); - out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd)); - out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL); - out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL); - out_be16(&mspi->pram->mrblr, SPI_MRBLR); - out_be32(&mspi->pram->rstate, 0); - out_be32(&mspi->pram->rdp, 0); - out_be16(&mspi->pram->rbptr, 0); - out_be16(&mspi->pram->rbc, 0); - out_be32(&mspi->pram->rxtmp, 0); - out_be32(&mspi->pram->tstate, 0); - out_be32(&mspi->pram->tdp, 0); - out_be16(&mspi->pram->tbptr, 0); - out_be16(&mspi->pram->tbc, 0); - out_be32(&mspi->pram->txtmp, 0); - - return 0; - -err_dummy_rx: - dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); -err_dummy_tx: - cpm_muram_free(bds_ofs); -err_bds: - cpm_muram_free(pram_ofs); -err_pram: - mpc8xxx_spi_free_dummy_rx(); - return -ENOMEM; -} - -static void mpc8xxx_spi_cpm_free(struct mpc8xxx_spi *mspi) -{ - struct device *dev = mspi->dev; - - dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE); - dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); - cpm_muram_free(cpm_muram_offset(mspi->tx_bd)); - cpm_muram_free(cpm_muram_offset(mspi->pram)); - mpc8xxx_spi_free_dummy_rx(); -} - -static const char *mpc8xxx_spi_strmode(unsigned int flags) -{ - if (flags & SPI_QE_CPU_MODE) { - return "QE CPU"; - } else if (flags & SPI_CPM_MODE) { - if (flags & SPI_QE) - return "QE"; - else if (flags & SPI_CPM2) - return "CPM2"; - else - return "CPM1"; - } - return "CPU"; -} - -static struct spi_master * __devinit -mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) -{ - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct spi_master *master; - struct mpc8xxx_spi *mpc8xxx_spi; - u32 regval; - int ret = 0; - - master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); - if (master == NULL) { - ret = -ENOMEM; - goto err; - } - - dev_set_drvdata(dev, master); - - /* the spi->mode bits understood by this driver: */ - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH - | SPI_LSB_FIRST | SPI_LOOP; - - master->setup = mpc8xxx_spi_setup; - master->transfer = mpc8xxx_spi_transfer; - master->cleanup = mpc8xxx_spi_cleanup; - - mpc8xxx_spi = spi_master_get_devdata(master); - mpc8xxx_spi->dev = dev; - mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; - mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; - mpc8xxx_spi->flags = pdata->flags; - mpc8xxx_spi->spibrg = pdata->sysclk; - - ret = mpc8xxx_spi_cpm_init(mpc8xxx_spi); - if (ret) - goto err_cpm_init; - - mpc8xxx_spi->rx_shift = 0; - mpc8xxx_spi->tx_shift = 0; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { - mpc8xxx_spi->rx_shift = 16; - mpc8xxx_spi->tx_shift = 24; - } - - init_completion(&mpc8xxx_spi->done); - - mpc8xxx_spi->base = ioremap(mem->start, resource_size(mem)); - if (mpc8xxx_spi->base == NULL) { - ret = -ENOMEM; - goto err_ioremap; - } - - mpc8xxx_spi->irq = irq; - - /* Register for SPI Interrupt */ - ret = request_irq(mpc8xxx_spi->irq, mpc8xxx_spi_irq, - 0, "mpc8xxx_spi", mpc8xxx_spi); - - if (ret != 0) - goto unmap_io; - - master->bus_num = pdata->bus_num; - master->num_chipselect = pdata->max_chipselect; - - /* SPI controller initializations */ - mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, 0); - mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0); - mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->command, 0); - mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->event, 0xffffffff); - - /* Enable SPI interface */ - regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; - if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) - regval |= SPMODE_OP; - - mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, regval); - spin_lock_init(&mpc8xxx_spi->lock); - init_completion(&mpc8xxx_spi->done); - INIT_WORK(&mpc8xxx_spi->work, mpc8xxx_spi_work); - INIT_LIST_HEAD(&mpc8xxx_spi->queue); - - mpc8xxx_spi->workqueue = create_singlethread_workqueue( - dev_name(master->dev.parent)); - if (mpc8xxx_spi->workqueue == NULL) { - ret = -EBUSY; - goto free_irq; - } - - ret = spi_register_master(master); - if (ret < 0) - goto unreg_master; - - dev_info(dev, "at 0x%p (irq = %d), %s mode\n", mpc8xxx_spi->base, - mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); - - return master; - -unreg_master: - destroy_workqueue(mpc8xxx_spi->workqueue); -free_irq: - free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); -unmap_io: - iounmap(mpc8xxx_spi->base); -err_ioremap: - mpc8xxx_spi_cpm_free(mpc8xxx_spi); -err_cpm_init: - spi_master_put(master); -err: - return ERR_PTR(ret); -} - -static int __devexit mpc8xxx_spi_remove(struct device *dev) -{ - struct mpc8xxx_spi *mpc8xxx_spi; - struct spi_master *master; - - master = dev_get_drvdata(dev); - mpc8xxx_spi = spi_master_get_devdata(master); - - flush_workqueue(mpc8xxx_spi->workqueue); - destroy_workqueue(mpc8xxx_spi->workqueue); - spi_unregister_master(master); - - free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); - iounmap(mpc8xxx_spi->base); - mpc8xxx_spi_cpm_free(mpc8xxx_spi); - - return 0; -} - -struct mpc8xxx_spi_probe_info { - struct fsl_spi_platform_data pdata; - int *gpios; - bool *alow_flags; -}; - -static struct mpc8xxx_spi_probe_info * -to_of_pinfo(struct fsl_spi_platform_data *pdata) -{ - return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); -} - -static void mpc8xxx_spi_cs_control(struct spi_device *spi, bool on) -{ - struct device *dev = spi->dev.parent; - struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data); - u16 cs = spi->chip_select; - int gpio = pinfo->gpios[cs]; - bool alow = pinfo->alow_flags[cs]; - - gpio_set_value(gpio, on ^ alow); -} - -static int of_mpc8xxx_spi_get_chipselects(struct device *dev) -{ - struct device_node *np = dev->of_node; - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); - unsigned int ngpios; - int i = 0; - int ret; - - ngpios = of_gpio_count(np); - if (!ngpios) { - /* - * SPI w/o chip-select line. One SPI device is still permitted - * though. - */ - pdata->max_chipselect = 1; - return 0; - } - - pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL); - if (!pinfo->gpios) - return -ENOMEM; - memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios)); - - pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags), - GFP_KERNEL); - if (!pinfo->alow_flags) { - ret = -ENOMEM; - goto err_alloc_flags; - } - - for (; i < ngpios; i++) { - int gpio; - enum of_gpio_flags flags; - - gpio = of_get_gpio_flags(np, i, &flags); - if (!gpio_is_valid(gpio)) { - dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); - ret = gpio; - goto err_loop; - } - - ret = gpio_request(gpio, dev_name(dev)); - if (ret) { - dev_err(dev, "can't request gpio #%d: %d\n", i, ret); - goto err_loop; - } - - pinfo->gpios[i] = gpio; - pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW; - - ret = gpio_direction_output(pinfo->gpios[i], - pinfo->alow_flags[i]); - if (ret) { - dev_err(dev, "can't set output direction for gpio " - "#%d: %d\n", i, ret); - goto err_loop; - } - } - - pdata->max_chipselect = ngpios; - pdata->cs_control = mpc8xxx_spi_cs_control; - - return 0; - -err_loop: - while (i >= 0) { - if (gpio_is_valid(pinfo->gpios[i])) - gpio_free(pinfo->gpios[i]); - i--; - } - - kfree(pinfo->alow_flags); - pinfo->alow_flags = NULL; -err_alloc_flags: - kfree(pinfo->gpios); - pinfo->gpios = NULL; - return ret; -} - -static int of_mpc8xxx_spi_free_chipselects(struct device *dev) -{ - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); - int i; - - if (!pinfo->gpios) - return 0; - - for (i = 0; i < pdata->max_chipselect; i++) { - if (gpio_is_valid(pinfo->gpios[i])) - gpio_free(pinfo->gpios[i]); - } - - kfree(pinfo->gpios); - kfree(pinfo->alow_flags); - return 0; -} - -static int __devinit of_mpc8xxx_spi_probe(struct of_device *ofdev, - const struct of_device_id *ofid) -{ - struct device *dev = &ofdev->dev; - struct device_node *np = ofdev->dev.of_node; - struct mpc8xxx_spi_probe_info *pinfo; - struct fsl_spi_platform_data *pdata; - struct spi_master *master; - struct resource mem; - struct resource irq; - const void *prop; - int ret = -ENOMEM; - - pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL); - if (!pinfo) - return -ENOMEM; - - pdata = &pinfo->pdata; - dev->platform_data = pdata; - - /* Allocate bus num dynamically. */ - pdata->bus_num = -1; - - /* SPI controller is either clocked from QE or SoC clock. */ - pdata->sysclk = get_brgfreq(); - if (pdata->sysclk == -1) { - pdata->sysclk = fsl_get_sys_freq(); - if (pdata->sysclk == -1) { - ret = -ENODEV; - goto err_clk; - } - } - - prop = of_get_property(np, "mode", NULL); - if (prop && !strcmp(prop, "cpu-qe")) - pdata->flags = SPI_QE_CPU_MODE; - else if (prop && !strcmp(prop, "qe")) - pdata->flags = SPI_CPM_MODE | SPI_QE; - else if (of_device_is_compatible(np, "fsl,cpm2-spi")) - pdata->flags = SPI_CPM_MODE | SPI_CPM2; - else if (of_device_is_compatible(np, "fsl,cpm1-spi")) - pdata->flags = SPI_CPM_MODE | SPI_CPM1; - - ret = of_mpc8xxx_spi_get_chipselects(dev); - if (ret) - goto err; - - ret = of_address_to_resource(np, 0, &mem); - if (ret) - goto err; - - ret = of_irq_to_resource(np, 0, &irq); - if (!ret) { - ret = -EINVAL; - goto err; - } - - master = mpc8xxx_spi_probe(dev, &mem, irq.start); - if (IS_ERR(master)) { - ret = PTR_ERR(master); - goto err; - } - - of_register_spi_devices(master, np); - - return 0; - -err: - of_mpc8xxx_spi_free_chipselects(dev); -err_clk: - kfree(pinfo); - return ret; -} - -static int __devexit of_mpc8xxx_spi_remove(struct of_device *ofdev) -{ - int ret; - - ret = mpc8xxx_spi_remove(&ofdev->dev); - if (ret) - return ret; - of_mpc8xxx_spi_free_chipselects(&ofdev->dev); - return 0; -} - -static const struct of_device_id of_mpc8xxx_spi_match[] = { - { .compatible = "fsl,spi" }, - {}, -}; -MODULE_DEVICE_TABLE(of, of_mpc8xxx_spi_match); - -static struct of_platform_driver of_mpc8xxx_spi_driver = { - .driver = { - .name = "mpc8xxx_spi", - .owner = THIS_MODULE, - .of_match_table = of_mpc8xxx_spi_match, - }, - .probe = of_mpc8xxx_spi_probe, - .remove = __devexit_p(of_mpc8xxx_spi_remove), -}; - -#ifdef CONFIG_MPC832x_RDB -/* - * XXX XXX XXX - * This is "legacy" platform driver, was used by the MPC8323E-RDB boards - * only. The driver should go away soon, since newer MPC8323E-RDB's device - * tree can work with OpenFirmware driver. But for now we support old trees - * as well. - */ -static int __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev) -{ - struct resource *mem; - int irq; - struct spi_master *master; - - if (!pdev->dev.platform_data) - return -EINVAL; - - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mem) - return -EINVAL; - - irq = platform_get_irq(pdev, 0); - if (irq <= 0) - return -EINVAL; - - master = mpc8xxx_spi_probe(&pdev->dev, mem, irq); - if (IS_ERR(master)) - return PTR_ERR(master); - return 0; -} - -static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev) -{ - return mpc8xxx_spi_remove(&pdev->dev); -} - -MODULE_ALIAS("platform:mpc8xxx_spi"); -static struct platform_driver mpc8xxx_spi_driver = { - .probe = plat_mpc8xxx_spi_probe, - .remove = __devexit_p(plat_mpc8xxx_spi_remove), - .driver = { - .name = "mpc8xxx_spi", - .owner = THIS_MODULE, - }, -}; - -static bool legacy_driver_failed; - -static void __init legacy_driver_register(void) -{ - legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); -} - -static void __exit legacy_driver_unregister(void) -{ - if (legacy_driver_failed) - return; - platform_driver_unregister(&mpc8xxx_spi_driver); -} -#else -static void __init legacy_driver_register(void) {} -static void __exit legacy_driver_unregister(void) {} -#endif /* CONFIG_MPC832x_RDB */ - -static int __init mpc8xxx_spi_init(void) -{ - legacy_driver_register(); - return of_register_platform_driver(&of_mpc8xxx_spi_driver); -} - -static void __exit mpc8xxx_spi_exit(void) -{ - of_unregister_platform_driver(&of_mpc8xxx_spi_driver); - legacy_driver_unregister(); -} - -module_init(mpc8xxx_spi_init); -module_exit(mpc8xxx_spi_exit); - -MODULE_AUTHOR("Kumar Gala"); -MODULE_DESCRIPTION("Simple MPC8xxx SPI Driver"); -MODULE_LICENSE("GPL");