| Message ID | 1361536659-23225-1-git-send-email-ldewangan@nvidia.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Fri, Feb 22, 2013 at 6:07 PM, Laxman Dewangan <ldewangan@nvidia.com> wrote: > Add SPI driver for NVIDIA's Tegra114 SPI controller. This controller > is different than the older SoCs SPI controller in internal design as > well as register interface. > > This driver supports the: > - non DMA based transfer for smaller transfer i.e. less than FIFO depth. > - APB DMA based transfer for lager transfer i.e. more than FIFO depth. s/lager/larger > - Clock gating through runtime PM callbacks. > - registration through DT only. > > Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> > Reviewed-by: Stephen Warren <swarren@nvidia.com> > --- > Changes from V1: > - All nit cleanups for nomenclature like Nvidia to NVIDIA, spi to SPI etc. > - remove bits_per_word check as all transfer have this valid parameter. > - Cleanups in dt parsing and remove dt node validity. > - use devm_ioremap_resource for mapping physical address. > > Changes from V2: > - Added clock info in the binding document. > - remove of_match_ptr(). > - sorted the kconfig and Makefile for new entry. > - Adding reviewed by Stephen. > > .../bindings/spi/nvidia,tegra114-spi.txt | 27 + > drivers/spi/Kconfig | 8 + > drivers/spi/Makefile | 1 + > drivers/spi/spi-tegra114.c | 1246 ++++++++++++++++++++ > 4 files changed, 1282 insertions(+), 0 deletions(-) > create mode 100644 Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt > create mode 100644 drivers/spi/spi-tegra114.c > > diff --git a/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt > new file mode 100644 > index 0000000..407618d > --- /dev/null > +++ b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt > @@ -0,0 +1,27 @@ > +NVIDIA Tegra114 SPI controller. > + > +Required properties: > +- compatible : should be "nvidia,tegra114-spi". > +- reg: Should contain SPI registers location and length. > +- interrupts: Should contain SPI interrupts. > +- nvidia,dma-request-selector : The Tegra DMA controller's phandle and > + request selector for this SPI controller. > +- This is also require clock named "spi" as per binding document > + Documentation/devicetree/bindings/clock/clock-bindings.txt > + > +Recommended properties: > +- spi-max-frequency: Definition as per > + Documentation/devicetree/bindings/spi/spi-bus.txt > +Example: > + > +spi@7000d600 { > + compatible = "nvidia,tegra114-spi"; > + reg = <0x7000d600 0x200>; > + interrupts = <0 82 0x04>; > + nvidia,dma-request-selector = <&apbdma 16>; > + spi-max-frequency = <25000000>; > + #address-cells = <1>; > + #size-cells = <0>; > + status = "disabled"; > +}; > + > diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig > index f80eee7..735e17b 100644 > --- a/drivers/spi/Kconfig > +++ b/drivers/spi/Kconfig > @@ -397,6 +397,14 @@ config SPI_MXS > help > SPI driver for Freescale MXS devices. > > +config SPI_TEGRA114 > + tristate "NVIDIA Tegra114 SPI Controller" > + depends on ARCH_TEGRA && TEGRA20_APB_DMA > + help > + SPI driver for NVIDIA Tegra114 SPI Controller interface. This controller > + is different than the older SoCs SPI controller and also register interface > + get changed with this controller. > + > config SPI_TEGRA20_SFLASH > tristate "Nvidia Tegra20 Serial flash Controller" > depends on ARCH_TEGRA > diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile > index e53c309..441db2b 100644 > --- a/drivers/spi/Makefile > +++ b/drivers/spi/Makefile > @@ -63,6 +63,7 @@ obj-$(CONFIG_SPI_SH_HSPI) += spi-sh-hspi.o > obj-$(CONFIG_SPI_SH_MSIOF) += spi-sh-msiof.o > obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o > obj-$(CONFIG_SPI_SIRF) += spi-sirf.o > +obj-$(CONFIG_SPI_TEGRA114) += spi-tegra114.o > obj-$(CONFIG_SPI_TEGRA20_SFLASH) += spi-tegra20-sflash.o > obj-$(CONFIG_SPI_TEGRA20_SLINK) += spi-tegra20-slink.o > obj-$(CONFIG_SPI_TI_SSP) += spi-ti-ssp.o > diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c > new file mode 100644 > index 0000000..598eb45 > --- /dev/null > +++ b/drivers/spi/spi-tegra114.c > @@ -0,0 +1,1246 @@ > +/* > + * SPI driver for NVIDIA's Tegra114 SPI Controller. > + * > + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. > + * > + * This program is distributed in the hope it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/clk.h> > +#include <linux/clk/tegra.h> > +#include <linux/completion.h> > +#include <linux/delay.h> > +#include <linux/dmaengine.h> > +#include <linux/dma-mapping.h> > +#include <linux/dmapool.h> > +#include <linux/err.h> > +#include <linux/init.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/kthread.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/spi/spi.h> > + > +#define SPI_COMMAND1 0x000 > +#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) > +#define SPI_PACKED (1 << 5) > +#define SPI_TX_EN (1 << 11) > +#define SPI_RX_EN (1 << 12) > +#define SPI_BOTH_EN_BYTE (1 << 13) > +#define SPI_BOTH_EN_BIT (1 << 14) > +#define SPI_LSBYTE_FE (1 << 15) > +#define SPI_LSBIT_FE (1 << 16) > +#define SPI_BIDIROE (1 << 17) > +#define SPI_IDLE_SDA_DRIVE_LOW (0 << 18) > +#define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18) > +#define SPI_IDLE_SDA_PULL_LOW (2 << 18) > +#define SPI_IDLE_SDA_PULL_HIGH (3 << 18) > +#define SPI_IDLE_SDA_MASK (3 << 18) > +#define SPI_CS_SS_VAL (1 << 20) > +#define SPI_CS_SW_HW (1 << 21) > +/* SPI_CS_POL_INACTIVE bits are default high */ > +#define SPI_CS_POL_INACTIVE 22 > +#define SPI_CS_POL_INACTIVE_0 (1 << 22) > +#define SPI_CS_POL_INACTIVE_1 (1 << 23) > +#define SPI_CS_POL_INACTIVE_2 (1 << 24) > +#define SPI_CS_POL_INACTIVE_3 (1 << 25) > +#define SPI_CS_POL_INACTIVE_MASK (0xF << 22) > + > +#define SPI_CS_SEL_0 (0 << 26) > +#define SPI_CS_SEL_1 (1 << 26) > +#define SPI_CS_SEL_2 (2 << 26) > +#define SPI_CS_SEL_3 (3 << 26) > +#define SPI_CS_SEL_MASK (3 << 26) > +#define SPI_CS_SEL(x) (((x) & 0x3) << 26) > +#define SPI_CONTROL_MODE_0 (0 << 28) > +#define SPI_CONTROL_MODE_1 (1 << 28) > +#define SPI_CONTROL_MODE_2 (2 << 28) > +#define SPI_CONTROL_MODE_3 (3 << 28) > +#define SPI_CONTROL_MODE_MASK (3 << 28) > +#define SPI_MODE_SEL(x) (((x) & 0x3) << 28) > +#define SPI_M_S (1 << 30) > +#define SPI_PIO (1 << 31) > + > +#define SPI_COMMAND2 0x004 > +#define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6) > +#define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0) > + > +#define SPI_CS_TIMING1 0x008 > +#define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold)) > +#define SPI_CS_SETUP_HOLD(reg, cs, val) \ > + ((((val) & 0xFFu) << ((cs) * 8)) | \ > + ((reg) & ~(0xFFu << ((cs) * 8)))) > + > +#define SPI_CS_TIMING2 0x00C > +#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0) > +#define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5) > +#define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8) > +#define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13) > +#define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16) > +#define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21) > +#define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24) > +#define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29) > +#define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \ > + (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \ > + ((reg) & ~(1 << ((cs) * 8 + 5)))) > +#define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \ > + (reg = (((val) & 0xF) << ((cs) * 8)) | \ > + ((reg) & ~(0xF << ((cs) * 8)))) > + > +#define SPI_TRANS_STATUS 0x010 > +#define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF) > +#define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF) > +#define SPI_RDY (1 << 30) > + > +#define SPI_FIFO_STATUS 0x014 > +#define SPI_RX_FIFO_EMPTY (1 << 0) > +#define SPI_RX_FIFO_FULL (1 << 1) > +#define SPI_TX_FIFO_EMPTY (1 << 2) > +#define SPI_TX_FIFO_FULL (1 << 3) > +#define SPI_RX_FIFO_UNF (1 << 4) > +#define SPI_RX_FIFO_OVF (1 << 5) > +#define SPI_TX_FIFO_UNF (1 << 6) > +#define SPI_TX_FIFO_OVF (1 << 7) > +#define SPI_ERR (1 << 8) > +#define SPI_TX_FIFO_FLUSH (1 << 14) > +#define SPI_RX_FIFO_FLUSH (1 << 15) > +#define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F) > +#define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F) > +#define SPI_FRAME_END (1 << 30) > +#define SPI_CS_INACTIVE (1 << 31) > + > +#define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \ > + SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF) > +#define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY) > + > +#define SPI_TX_DATA 0x018 > +#define SPI_RX_DATA 0x01C > + > +#define SPI_DMA_CTL 0x020 > +#define SPI_TX_TRIG_1 (0 << 15) > +#define SPI_TX_TRIG_4 (1 << 15) > +#define SPI_TX_TRIG_8 (2 << 15) > +#define SPI_TX_TRIG_16 (3 << 15) > +#define SPI_TX_TRIG_MASK (3 << 15) > +#define SPI_RX_TRIG_1 (0 << 19) > +#define SPI_RX_TRIG_4 (1 << 19) > +#define SPI_RX_TRIG_8 (2 << 19) > +#define SPI_RX_TRIG_16 (3 << 19) > +#define SPI_RX_TRIG_MASK (3 << 19) > +#define SPI_IE_TX (1 << 28) > +#define SPI_IE_RX (1 << 29) > +#define SPI_CONT (1 << 30) > +#define SPI_DMA (1 << 31) > +#define SPI_DMA_EN SPI_DMA > + > +#define SPI_DMA_BLK 0x024 > +#define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0) > + > +#define SPI_TX_FIFO 0x108 > +#define SPI_RX_FIFO 0x188 > +#define MAX_CHIP_SELECT 4 > +#define SPI_FIFO_DEPTH 64 > +#define DATA_DIR_TX (1 << 0) > +#define DATA_DIR_RX (1 << 1) > + > +#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) > +#define DEFAULT_SPI_DMA_BUF_LEN (16*1024) > +#define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40) > +#define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0) > +#define MAX_HOLD_CYCLES 16 > +#define SPI_DEFAULT_SPEED 25000000 > + > +#define MAX_CHIP_SELECT 4 > +#define SPI_FIFO_DEPTH 64 > + > +struct tegra_spi_data { > + struct device *dev; > + struct spi_master *master; > + spinlock_t lock; > + > + struct clk *clk; > + void __iomem *base; > + phys_addr_t phys; > + unsigned irq; > + int dma_req_sel; > + u32 spi_max_frequency; > + u32 cur_speed; > + > + struct spi_device *cur_spi; > + unsigned cur_pos; > + unsigned cur_len; > + unsigned words_per_32bit; > + unsigned bytes_per_word; > + unsigned curr_dma_words; > + unsigned cur_direction; > + > + unsigned cur_rx_pos; > + unsigned cur_tx_pos; > + > + unsigned dma_buf_size; > + unsigned max_buf_size; > + bool is_curr_dma_xfer; > + > + struct completion rx_dma_complete; > + struct completion tx_dma_complete; > + > + u32 tx_status; > + u32 rx_status; > + u32 status_reg; > + bool is_packed; > + unsigned long packed_size; > + > + u32 command1_reg; > + u32 dma_control_reg; > + u32 def_command1_reg; > + u32 spi_cs_timing; > + > + struct completion xfer_completion; > + struct spi_transfer *curr_xfer; > + struct dma_chan *rx_dma_chan; > + u32 *rx_dma_buf; > + dma_addr_t rx_dma_phys; > + struct dma_async_tx_descriptor *rx_dma_desc; > + > + struct dma_chan *tx_dma_chan; > + u32 *tx_dma_buf; > + dma_addr_t tx_dma_phys; > + struct dma_async_tx_descriptor *tx_dma_desc; > +}; > + > +static int tegra_spi_runtime_suspend(struct device *dev); > +static int tegra_spi_runtime_resume(struct device *dev); > + > +static inline unsigned long tegra_spi_readl(struct tegra_spi_data *tspi, > + unsigned long reg) > +{ > + return readl(tspi->base + reg); > +} > + > +static inline void tegra_spi_writel(struct tegra_spi_data *tspi, > + unsigned long val, unsigned long reg) > +{ > + writel(val, tspi->base + reg); > + > + /* Read back register to make sure that register writes completed */ > + if (reg != SPI_TX_FIFO) > + readl(tspi->base + SPI_COMMAND1); > +} > + > +static void tegra_spi_clear_status(struct tegra_spi_data *tspi) > +{ > + unsigned long val; > + > + /* Write 1 to clear status register */ > + val = tegra_spi_readl(tspi, SPI_TRANS_STATUS); > + tegra_spi_writel(tspi, val, SPI_TRANS_STATUS); > + > + /* Clear fifo status error if any */ > + val = tegra_spi_readl(tspi, SPI_FIFO_STATUS); > + if (val & SPI_ERR) > + tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR, > + SPI_FIFO_STATUS); > +} > + > +static unsigned tegra_spi_calculate_curr_xfer_param( > + struct spi_device *spi, struct tegra_spi_data *tspi, > + struct spi_transfer *t) > +{ > + unsigned remain_len = t->len - tspi->cur_pos; > + unsigned max_word; > + unsigned bits_per_word = t->bits_per_word; > + unsigned max_len; > + unsigned total_fifo_words; > + > + tspi->bytes_per_word = (bits_per_word - 1) / 8 + 1; > + > + if (bits_per_word == 8 || bits_per_word == 16) { > + tspi->is_packed = 1; > + tspi->words_per_32bit = 32/bits_per_word; > + } else { > + tspi->is_packed = 0; > + tspi->words_per_32bit = 1; > + } > + > + if (tspi->is_packed) { > + max_len = min(remain_len, tspi->max_buf_size); > + tspi->curr_dma_words = max_len/tspi->bytes_per_word; > + total_fifo_words = (max_len + 3) / 4; > + } else { > + max_word = (remain_len - 1) / tspi->bytes_per_word + 1; > + max_word = min(max_word, tspi->max_buf_size/4); > + tspi->curr_dma_words = max_word; > + total_fifo_words = max_word; > + } > + return total_fifo_words; > +} > + > +static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf( > + struct tegra_spi_data *tspi, struct spi_transfer *t) > +{ > + unsigned nbytes; > + unsigned tx_empty_count; > + unsigned long fifo_status; > + unsigned max_n_32bit; > + unsigned i, count; > + unsigned long x; > + unsigned int written_words; > + unsigned fifo_words_left; > + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; > + > + fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); > + tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status); > + > + if (tspi->is_packed) { > + fifo_words_left = tx_empty_count * tspi->words_per_32bit; > + written_words = min(fifo_words_left, tspi->curr_dma_words); > + nbytes = written_words * tspi->bytes_per_word; > + max_n_32bit = DIV_ROUND_UP(nbytes, 4); > + for (count = 0; count < max_n_32bit; count++) { > + x = 0; > + for (i = 0; (i < 4) && nbytes; i++, nbytes--) > + x |= (*tx_buf++) << (i*8); > + tegra_spi_writel(tspi, x, SPI_TX_FIFO); > + } > + } else { > + max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); > + written_words = max_n_32bit; > + nbytes = written_words * tspi->bytes_per_word; > + for (count = 0; count < max_n_32bit; count++) { > + x = 0; > + for (i = 0; nbytes && (i < tspi->bytes_per_word); > + i++, nbytes--) > + x |= ((*tx_buf++) << i*8); > + tegra_spi_writel(tspi, x, SPI_TX_FIFO); > + } > + } > + tspi->cur_tx_pos += written_words * tspi->bytes_per_word; > + return written_words; > +} > + > +static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf( > + struct tegra_spi_data *tspi, struct spi_transfer *t) > +{ > + unsigned rx_full_count; > + unsigned long fifo_status; > + unsigned i, count; > + unsigned long x; > + unsigned int read_words = 0; > + unsigned len; > + u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; > + > + fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); > + rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status); > + if (tspi->is_packed) { > + len = tspi->curr_dma_words * tspi->bytes_per_word; > + for (count = 0; count < rx_full_count; count++) { > + x = tegra_spi_readl(tspi, SPI_RX_FIFO); > + for (i = 0; len && (i < 4); i++, len--) > + *rx_buf++ = (x >> i*8) & 0xFF; > + } > + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; > + read_words += tspi->curr_dma_words; > + } else { > + unsigned int rx_mask; > + unsigned int bits_per_word = t->bits_per_word; > + > + rx_mask = (1 << bits_per_word) - 1; > + for (count = 0; count < rx_full_count; count++) { > + x = tegra_spi_readl(tspi, SPI_RX_FIFO); > + x &= rx_mask; > + for (i = 0; (i < tspi->bytes_per_word); i++) > + *rx_buf++ = (x >> (i*8)) & 0xFF; > + } > + tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; > + read_words += rx_full_count; > + } > + return read_words; > +} > + > +static void tegra_spi_copy_client_txbuf_to_spi_txbuf( > + struct tegra_spi_data *tspi, struct spi_transfer *t) > +{ > + unsigned len; > + > + /* Make the dma buffer to read by cpu */ > + dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys, > + tspi->dma_buf_size, DMA_TO_DEVICE); > + > + if (tspi->is_packed) { > + len = tspi->curr_dma_words * tspi->bytes_per_word; > + memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); > + } else { > + unsigned int i; > + unsigned int count; > + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; > + unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; > + unsigned int x; > + > + for (count = 0; count < tspi->curr_dma_words; count++) { > + x = 0; > + for (i = 0; consume && (i < tspi->bytes_per_word); > + i++, consume--) > + x |= ((*tx_buf++) << i * 8); > + tspi->tx_dma_buf[count] = x; > + } > + } > + tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; > + > + /* Make the dma buffer to read by dma */ > + dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, > + tspi->dma_buf_size, DMA_TO_DEVICE); > +} > + > +static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf( > + struct tegra_spi_data *tspi, struct spi_transfer *t) > +{ > + unsigned len; > + > + /* Make the dma buffer to read by cpu */ > + dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys, > + tspi->dma_buf_size, DMA_FROM_DEVICE); > + > + if (tspi->is_packed) { > + len = tspi->curr_dma_words * tspi->bytes_per_word; > + memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); > + } else { > + unsigned int i; > + unsigned int count; > + unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; > + unsigned int x; > + unsigned int rx_mask; > + unsigned int bits_per_word = t->bits_per_word; > + > + rx_mask = (1 << bits_per_word) - 1; > + for (count = 0; count < tspi->curr_dma_words; count++) { > + x = tspi->rx_dma_buf[count]; > + x &= rx_mask; > + for (i = 0; (i < tspi->bytes_per_word); i++) > + *rx_buf++ = (x >> (i*8)) & 0xFF; > + } > + } > + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; > + > + /* Make the dma buffer to read by dma */ > + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, > + tspi->dma_buf_size, DMA_FROM_DEVICE); > +} > + > +static void tegra_spi_dma_complete(void *args) > +{ > + struct completion *dma_complete = args; > + > + complete(dma_complete); > +} > + > +static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len) > +{ > + INIT_COMPLETION(tspi->tx_dma_complete); > + tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, > + tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, > + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); > + if (!tspi->tx_dma_desc) { > + dev_err(tspi->dev, "Not able to get desc for Tx\n"); > + return -EIO; > + } > + > + tspi->tx_dma_desc->callback = tegra_spi_dma_complete; > + tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete; > + > + dmaengine_submit(tspi->tx_dma_desc); > + dma_async_issue_pending(tspi->tx_dma_chan); > + return 0; > +} > + > +static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len) > +{ > + INIT_COMPLETION(tspi->rx_dma_complete); > + tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, > + tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, > + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); > + if (!tspi->rx_dma_desc) { > + dev_err(tspi->dev, "Not able to get desc for Rx\n"); > + return -EIO; > + } > + > + tspi->rx_dma_desc->callback = tegra_spi_dma_complete; > + tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete; > + > + dmaengine_submit(tspi->rx_dma_desc); > + dma_async_issue_pending(tspi->rx_dma_chan); > + return 0; > +} > + > +static int tegra_spi_start_dma_based_transfer( > + struct tegra_spi_data *tspi, struct spi_transfer *t) > +{ > + unsigned long val; > + unsigned int len; > + int ret = 0; > + unsigned long status; > + > + /* Make sure that Rx and Tx fifo are empty */ > + status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); > + if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) { > + dev_err(tspi->dev, > + "Rx/Tx fifo are not empty status 0x%08lx\n", status); > + return -EIO; > + } > + > + val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1); > + tegra_spi_writel(tspi, val, SPI_DMA_BLK); > + > + if (tspi->is_packed) > + len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word, > + 4) * 4; > + else > + len = tspi->curr_dma_words * 4; > + > + /* Set attention level based on length of transfer */ > + if (len & 0xF) > + val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1; > + else if (((len) >> 4) & 0x1) > + val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4; > + else > + val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8; > + > + if (tspi->cur_direction & DATA_DIR_TX) > + val |= SPI_IE_TX; > + > + if (tspi->cur_direction & DATA_DIR_RX) > + val |= SPI_IE_RX; > + > + tegra_spi_writel(tspi, val, SPI_DMA_CTL); > + tspi->dma_control_reg = val; > + > + if (tspi->cur_direction & DATA_DIR_TX) { > + tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t); > + ret = tegra_spi_start_tx_dma(tspi, len); > + if (ret < 0) { > + dev_err(tspi->dev, > + "Starting tx dma failed, err %d\n", ret); > + return ret; > + } > + } > + > + if (tspi->cur_direction & DATA_DIR_RX) { > + /* Make the dma buffer to read by dma */ > + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, > + tspi->dma_buf_size, DMA_FROM_DEVICE); > + > + ret = tegra_spi_start_rx_dma(tspi, len); > + if (ret < 0) { > + dev_err(tspi->dev, > + "Starting rx dma failed, err %d\n", ret); > + if (tspi->cur_direction & DATA_DIR_TX) > + dmaengine_terminate_all(tspi->tx_dma_chan); > + return ret; > + } > + } > + tspi->is_curr_dma_xfer = true; > + tspi->dma_control_reg = val; > + > + val |= SPI_DMA_EN; > + tegra_spi_writel(tspi, val, SPI_DMA_CTL); > + return ret; > +} > + > +static int tegra_spi_start_cpu_based_transfer( > + struct tegra_spi_data *tspi, struct spi_transfer *t) > +{ > + unsigned long val; > + unsigned cur_words; > + > + if (tspi->cur_direction & DATA_DIR_TX) > + cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t); > + else > + cur_words = tspi->curr_dma_words; > + > + val = SPI_DMA_BLK_SET(cur_words - 1); > + tegra_spi_writel(tspi, val, SPI_DMA_BLK); > + > + val = 0; > + if (tspi->cur_direction & DATA_DIR_TX) > + val |= SPI_IE_TX; > + > + if (tspi->cur_direction & DATA_DIR_RX) > + val |= SPI_IE_RX; > + > + tegra_spi_writel(tspi, val, SPI_DMA_CTL); > + tspi->dma_control_reg = val; > + > + tspi->is_curr_dma_xfer = false; > + > + val |= SPI_DMA_EN; > + tegra_spi_writel(tspi, val, SPI_DMA_CTL); > + return 0; > +} > + > +static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi, > + bool dma_to_memory) > +{ > + struct dma_chan *dma_chan; > + u32 *dma_buf; > + dma_addr_t dma_phys; > + int ret; > + struct dma_slave_config dma_sconfig; > + dma_cap_mask_t mask; > + > + dma_cap_zero(mask); > + dma_cap_set(DMA_SLAVE, mask); > + dma_chan = dma_request_channel(mask, NULL, NULL); > + if (!dma_chan) { > + dev_err(tspi->dev, > + "Dma channel is not available, will try later\n"); > + return -EPROBE_DEFER; > + } > + > + dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size, > + &dma_phys, GFP_KERNEL); > + if (!dma_buf) { > + dev_err(tspi->dev, " Not able to allocate the dma buffer\n"); > + dma_release_channel(dma_chan); > + return -ENOMEM; > + } > + > + dma_sconfig.slave_id = tspi->dma_req_sel; > + if (dma_to_memory) { > + dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO; > + dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + dma_sconfig.src_maxburst = 0; > + } else { > + dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO; > + dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + dma_sconfig.dst_maxburst = 0; > + } > + > + ret = dmaengine_slave_config(dma_chan, &dma_sconfig); > + if (ret) > + goto scrub; > + if (dma_to_memory) { > + tspi->rx_dma_chan = dma_chan; > + tspi->rx_dma_buf = dma_buf; > + tspi->rx_dma_phys = dma_phys; > + } else { > + tspi->tx_dma_chan = dma_chan; > + tspi->tx_dma_buf = dma_buf; > + tspi->tx_dma_phys = dma_phys; > + } > + return 0; > + > +scrub: > + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); > + dma_release_channel(dma_chan); > + return ret; > +} > + > +static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi, > + bool dma_to_memory) > +{ > + u32 *dma_buf; > + dma_addr_t dma_phys; > + struct dma_chan *dma_chan; > + > + if (dma_to_memory) { > + dma_buf = tspi->rx_dma_buf; > + dma_chan = tspi->rx_dma_chan; > + dma_phys = tspi->rx_dma_phys; > + tspi->rx_dma_chan = NULL; > + tspi->rx_dma_buf = NULL; > + } else { > + dma_buf = tspi->tx_dma_buf; > + dma_chan = tspi->tx_dma_chan; > + dma_phys = tspi->tx_dma_phys; > + tspi->tx_dma_buf = NULL; > + tspi->tx_dma_chan = NULL; > + } > + if (!dma_chan) > + return; > + > + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); > + dma_release_channel(dma_chan); > +} > + > +static int tegra_spi_start_transfer_one(struct spi_device *spi, > + struct spi_transfer *t, bool is_first_of_msg, > + bool is_single_xfer) > +{ > + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); > + u32 speed = t->speed_hz; > + u8 bits_per_word = t->bits_per_word; > + unsigned total_fifo_words; > + int ret; > + unsigned long command1; > + int req_mode; > + > + if (speed != tspi->cur_speed) { > + clk_set_rate(tspi->clk, speed); > + tspi->cur_speed = speed; > + } > + > + tspi->cur_spi = spi; > + tspi->cur_pos = 0; > + tspi->cur_rx_pos = 0; > + tspi->cur_tx_pos = 0; > + tspi->curr_xfer = t; > + total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t); > + > + if (is_first_of_msg) { > + tegra_spi_clear_status(tspi); > + > + command1 = tspi->def_command1_reg; > + command1 |= SPI_BIT_LENGTH(bits_per_word - 1); > + > + command1 &= ~SPI_CONTROL_MODE_MASK; > + req_mode = spi->mode & 0x3; > + if (req_mode == SPI_MODE_0) > + command1 |= SPI_CONTROL_MODE_0; > + else if (req_mode == SPI_MODE_1) > + command1 |= SPI_CONTROL_MODE_1; > + else if (req_mode == SPI_MODE_2) > + command1 |= SPI_CONTROL_MODE_2; > + else if (req_mode == SPI_MODE_3) > + command1 |= SPI_CONTROL_MODE_3; > + > + tegra_spi_writel(tspi, command1, SPI_COMMAND1); > + > + command1 |= SPI_CS_SW_HW; > + if (spi->mode & SPI_CS_HIGH) > + command1 |= SPI_CS_SS_VAL; > + else > + command1 &= ~SPI_CS_SS_VAL; > + > + tegra_spi_writel(tspi, 0, SPI_COMMAND2); > + } else { > + command1 = tspi->command1_reg; > + command1 &= ~SPI_BIT_LENGTH(~0); > + command1 |= SPI_BIT_LENGTH(bits_per_word - 1); > + } > + > + if (tspi->is_packed) > + command1 |= SPI_PACKED; > + > + command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN); > + tspi->cur_direction = 0; > + if (t->rx_buf) { > + command1 |= SPI_RX_EN; > + tspi->cur_direction |= DATA_DIR_RX; > + } > + if (t->tx_buf) { > + command1 |= SPI_TX_EN; > + tspi->cur_direction |= DATA_DIR_TX; > + } > + command1 |= SPI_CS_SEL(spi->chip_select); > + tegra_spi_writel(tspi, command1, SPI_COMMAND1); > + tspi->command1_reg = command1; > + > + dev_dbg(tspi->dev, "The def 0x%x and written 0x%lx\n", > + tspi->def_command1_reg, command1); > + > + if (total_fifo_words > SPI_FIFO_DEPTH) > + ret = tegra_spi_start_dma_based_transfer(tspi, t); > + else > + ret = tegra_spi_start_cpu_based_transfer(tspi, t); > + return ret; > +} > + > +static int tegra_spi_setup(struct spi_device *spi) > +{ > + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); > + unsigned long val; > + unsigned long flags; > + int ret; > + unsigned int cs_pol_bit[MAX_CHIP_SELECT] = { > + SPI_CS_POL_INACTIVE_0, > + SPI_CS_POL_INACTIVE_1, > + SPI_CS_POL_INACTIVE_2, > + SPI_CS_POL_INACTIVE_3, > + }; > + > + dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", > + spi->bits_per_word, > + spi->mode & SPI_CPOL ? "" : "~", > + spi->mode & SPI_CPHA ? "" : "~", > + spi->max_speed_hz); > + > + BUG_ON(spi->chip_select >= MAX_CHIP_SELECT); > + > + /* Set speed to the spi max fequency if spi device has not set */ > + spi->max_speed_hz = spi->max_speed_hz ? : tspi->spi_max_frequency; > + > + ret = pm_runtime_get_sync(tspi->dev); > + if (ret < 0) { > + dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret); > + return ret; > + } > + > + spin_lock_irqsave(&tspi->lock, flags); > + val = tspi->def_command1_reg; > + if (spi->mode & SPI_CS_HIGH) > + val &= ~cs_pol_bit[spi->chip_select]; > + else > + val |= cs_pol_bit[spi->chip_select]; > + tspi->def_command1_reg = val; > + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); > + spin_unlock_irqrestore(&tspi->lock, flags); > + > + pm_runtime_put(tspi->dev); > + return 0; > +} > + > +static int tegra_spi_transfer_one_message(struct spi_master *master, > + struct spi_message *msg) > +{ > + bool is_first_msg = true; > + int single_xfer; > + struct tegra_spi_data *tspi = spi_master_get_devdata(master); > + struct spi_transfer *xfer; > + struct spi_device *spi = msg->spi; > + int ret; > + > + msg->status = 0; > + msg->actual_length = 0; > + > + ret = pm_runtime_get_sync(tspi->dev); > + if (ret < 0) { > + dev_err(tspi->dev, "runtime PM get failed: %d\n", ret); > + msg->status = ret; > + spi_finalize_current_message(master); > + return ret; > + } > + > + single_xfer = list_is_singular(&msg->transfers); > + list_for_each_entry(xfer, &msg->transfers, transfer_list) { > + INIT_COMPLETION(tspi->xfer_completion); > + ret = tegra_spi_start_transfer_one(spi, xfer, > + is_first_msg, single_xfer); > + if (ret < 0) { > + dev_err(tspi->dev, > + "spi can not start transfer, err %d\n", ret); > + goto exit; > + } > + is_first_msg = false; > + ret = wait_for_completion_timeout(&tspi->xfer_completion, > + SPI_DMA_TIMEOUT); > + if (WARN_ON(ret == 0)) { > + dev_err(tspi->dev, > + "spi trasfer timeout, err %d\n", ret); > + ret = -EIO; > + goto exit; > + } > + > + if (tspi->tx_status || tspi->rx_status) { > + dev_err(tspi->dev, "Error in Transfer\n"); > + ret = -EIO; > + goto exit; > + } > + msg->actual_length += xfer->len; > + if (xfer->cs_change && xfer->delay_usecs) { > + tegra_spi_writel(tspi, tspi->def_command1_reg, > + SPI_COMMAND1); > + udelay(xfer->delay_usecs); > + } > + } > + ret = 0; > +exit: > + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); > + pm_runtime_put(tspi->dev); > + msg->status = ret; > + spi_finalize_current_message(master); > + return ret; > +} > + > +static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi) > +{ > + struct spi_transfer *t = tspi->curr_xfer; > + unsigned long flags; > + > + spin_lock_irqsave(&tspi->lock, flags); > + if (tspi->tx_status || tspi->rx_status) { > + dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n", > + tspi->status_reg); > + dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n", > + tspi->command1_reg, tspi->dma_control_reg); > + tegra_periph_reset_assert(tspi->clk); > + udelay(2); > + tegra_periph_reset_deassert(tspi->clk); > + complete(&tspi->xfer_completion); > + goto exit; > + } > + > + if (tspi->cur_direction & DATA_DIR_RX) > + tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t); > + > + if (tspi->cur_direction & DATA_DIR_TX) > + tspi->cur_pos = tspi->cur_tx_pos; > + else > + tspi->cur_pos = tspi->cur_rx_pos; > + > + if (tspi->cur_pos == t->len) { > + complete(&tspi->xfer_completion); > + goto exit; > + } > + > + tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); > + tegra_spi_start_cpu_based_transfer(tspi, t); > +exit: > + spin_unlock_irqrestore(&tspi->lock, flags); > + return IRQ_HANDLED; > +} > + > +static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi) > +{ > + struct spi_transfer *t = tspi->curr_xfer; > + long wait_status; > + int err = 0; > + unsigned total_fifo_words; > + unsigned long flags; > + > + /* Abort dmas if any error */ > + if (tspi->cur_direction & DATA_DIR_TX) { > + if (tspi->tx_status) { > + dmaengine_terminate_all(tspi->tx_dma_chan); > + err += 1; > + } else { > + wait_status = wait_for_completion_interruptible_timeout( > + &tspi->tx_dma_complete, SPI_DMA_TIMEOUT); > + if (wait_status <= 0) { > + dmaengine_terminate_all(tspi->tx_dma_chan); > + dev_err(tspi->dev, "TxDma Xfer failed\n"); > + err += 1; > + } > + } > + } > + > + if (tspi->cur_direction & DATA_DIR_RX) { > + if (tspi->rx_status) { > + dmaengine_terminate_all(tspi->rx_dma_chan); > + err += 2; > + } else { > + wait_status = wait_for_completion_interruptible_timeout( > + &tspi->rx_dma_complete, SPI_DMA_TIMEOUT); > + if (wait_status <= 0) { > + dmaengine_terminate_all(tspi->rx_dma_chan); > + dev_err(tspi->dev, "RxDma Xfer failed\n"); > + err += 2; > + } > + } > + } > + > + spin_lock_irqsave(&tspi->lock, flags); > + if (err) { > + dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n", > + tspi->status_reg); > + dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n", > + tspi->command1_reg, tspi->dma_control_reg); > + tegra_periph_reset_assert(tspi->clk); > + udelay(2); > + tegra_periph_reset_deassert(tspi->clk); > + complete(&tspi->xfer_completion); > + spin_unlock_irqrestore(&tspi->lock, flags); > + return IRQ_HANDLED; > + } > + > + if (tspi->cur_direction & DATA_DIR_RX) > + tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t); > + > + if (tspi->cur_direction & DATA_DIR_TX) > + tspi->cur_pos = tspi->cur_tx_pos; > + else > + tspi->cur_pos = tspi->cur_rx_pos; > + > + if (tspi->cur_pos == t->len) { > + complete(&tspi->xfer_completion); > + goto exit; > + } > + > + /* Continue transfer in current message */ > + total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, > + tspi, t); > + if (total_fifo_words > SPI_FIFO_DEPTH) > + err = tegra_spi_start_dma_based_transfer(tspi, t); > + else > + err = tegra_spi_start_cpu_based_transfer(tspi, t); > + > +exit: > + spin_unlock_irqrestore(&tspi->lock, flags); > + return IRQ_HANDLED; > +} > + > +static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data) > +{ > + struct tegra_spi_data *tspi = context_data; > + > + if (!tspi->is_curr_dma_xfer) > + return handle_cpu_based_xfer(tspi); > + return handle_dma_based_xfer(tspi); > +} > + > +static irqreturn_t tegra_spi_isr(int irq, void *context_data) > +{ > + struct tegra_spi_data *tspi = context_data; > + > + tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS); > + if (tspi->cur_direction & DATA_DIR_TX) > + tspi->tx_status = tspi->status_reg & > + (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF); > + > + if (tspi->cur_direction & DATA_DIR_RX) > + tspi->rx_status = tspi->status_reg & > + (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF); > + tegra_spi_clear_status(tspi); > + > + return IRQ_WAKE_THREAD; > +} > + > +static void tegra_spi_parse_dt(struct platform_device *pdev, > + struct tegra_spi_data *tspi) > +{ > + struct device_node *np = pdev->dev.of_node; > + u32 of_dma[2]; > + > + if (of_property_read_u32_array(np, "nvidia,dma-request-selector", > + of_dma, 2) >= 0) > + tspi->dma_req_sel = of_dma[1]; > + > + if (of_property_read_u32(np, "spi-max-frequency", > + &tspi->spi_max_frequency)) > + tspi->spi_max_frequency = 25000000; /* 25MHz */ > +} > + > +static struct of_device_id tegra_spi_of_match[] = { > + { .compatible = "nvidia,tegra114-spi", }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, tegra_spi_of_match); > + > +static int tegra_spi_probe(struct platform_device *pdev) > +{ > + struct spi_master *master; > + struct tegra_spi_data *tspi; > + struct resource *r; > + int ret, spi_irq; > + > + master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); > + if (!master) { > + dev_err(&pdev->dev, "master allocation failed\n"); > + return -ENOMEM; > + } > + dev_set_drvdata(&pdev->dev, master); > + tspi = spi_master_get_devdata(master); > + > + /* Parse DT */ > + tegra_spi_parse_dt(pdev, tspi); > + > + /* the spi->mode bits understood by this driver: */ > + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; > + master->setup = tegra_spi_setup; > + master->transfer_one_message = tegra_spi_transfer_one_message; > + master->num_chipselect = MAX_CHIP_SELECT; > + master->bus_num = -1; > + > + tspi->master = master; > + tspi->dev = &pdev->dev; > + spin_lock_init(&tspi->lock); > + > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!r) { > + dev_err(&pdev->dev, "No IO memory resource\n"); > + ret = -ENODEV; > + goto exit_free_master; > + } > + tspi->phys = r->start; > + tspi->base = devm_ioremap_resource(&pdev->dev, r); > + if (IS_ERR(tspi->base)) { > + ret = PTR_ERR(tspi->base); > + dev_err(&pdev->dev, "ioremap failed: err = %d\n", ret); > + goto exit_free_master; > + } > + > + spi_irq = platform_get_irq(pdev, 0); > + tspi->irq = spi_irq; > + ret = request_threaded_irq(tspi->irq, tegra_spi_isr, > + tegra_spi_isr_thread, IRQF_ONESHOT, > + dev_name(&pdev->dev), tspi); Can we use devm_request_threaded_irq instead? to save some code. Thanks Manish Badarkhe ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb
On Fri, 22 Feb 2013 19:59:11 +0530, Manish Badarkhe <badarkhe.manish@gmail.com> wrote: > On Fri, Feb 22, 2013 at 6:07 PM, Laxman Dewangan <ldewangan@nvidia.com> wrote: > > Add SPI driver for NVIDIA's Tegra114 SPI controller. This controller > > is different than the older SoCs SPI controller in internal design as > > well as register interface. > > > > This driver supports the: > > - non DMA based transfer for smaller transfer i.e. less than FIFO depth. > > - APB DMA based transfer for lager transfer i.e. more than FIFO depth. > > s/lager/larger Applied, thanks. And I fixed up the typo when I did. > > + spi_irq = platform_get_irq(pdev, 0); > > + tspi->irq = spi_irq; > > + ret = request_threaded_irq(tspi->irq, tegra_spi_isr, > > + tegra_spi_isr_thread, IRQF_ONESHOT, > > + dev_name(&pdev->dev), tspi); > > Can we use devm_request_threaded_irq instead? to save some code. I don't have any quams about applying it as-is. That can be done as a follow on patch. g. ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb
Hi Mark, On Fri, Feb 22, 2013 at 11:32 PM, Mark Brown <broonie@opensource.wolfsonmicro.com> wrote: > On Fri, Feb 22, 2013 at 07:59:11PM +0530, Manish Badarkhe wrote: >> On Fri, Feb 22, 2013 at 6:07 PM, Laxman Dewangan <ldewangan@nvidia.com> wrote: >> > Add SPI driver for NVIDIA's Tegra114 SPI controller. This controller >> > is different than the older SoCs SPI controller in internal design as >> > well as register interface. >> > >> > This driver supports the: >> > - non DMA based transfer for smaller transfer i.e. less than FIFO depth. >> > - APB DMA based transfer for lager transfer i.e. more than FIFO depth. >> >> s/lager/larger >> >> > - Clock gating through runtime PM callbacks. >> > - registration through DT only. > > Delete unneeded context from your replies, we shouldn't need to page > through the entire patch because you've noticed a spelling error... Thanks for your reply. I will take care of this later on. Thanks Manish Badarkhe ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb
On Sunday 03 March 2013 04:39 AM, Grant Likely wrote: > On Fri, 22 Feb 2013 19:59:11 +0530, Manish Badarkhe <badarkhe.manish@gmail.com> wrote: >> On Fri, Feb 22, 2013 at 6:07 PM, Laxman Dewangan <ldewangan@nvidia.com> wrote: >>> Add SPI driver for NVIDIA's Tegra114 SPI controller. This controller >>> is different than the older SoCs SPI controller in internal design as >>> well as register interface. >>> >>> This driver supports the: >>> - non DMA based transfer for smaller transfer i.e. less than FIFO depth. >>> - APB DMA based transfer for lager transfer i.e. more than FIFO depth. >> s/lager/larger > Applied, thanks. And I fixed up the typo when I did. > Grant, I still do not see this change in linux-next? Are you going to put this change for K3.10? Wanted to close some of stuff from Tegra side. ------------------------------------------------------------------------------ Own the Future-Intel® Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d
diff --git a/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt new file mode 100644 index 0000000..407618d --- /dev/null +++ b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt @@ -0,0 +1,27 @@ +NVIDIA Tegra114 SPI controller. + +Required properties: +- compatible : should be "nvidia,tegra114-spi". +- reg: Should contain SPI registers location and length. +- interrupts: Should contain SPI interrupts. +- nvidia,dma-request-selector : The Tegra DMA controller's phandle and + request selector for this SPI controller. +- This is also require clock named "spi" as per binding document + Documentation/devicetree/bindings/clock/clock-bindings.txt + +Recommended properties: +- spi-max-frequency: Definition as per + Documentation/devicetree/bindings/spi/spi-bus.txt +Example: + +spi@7000d600 { + compatible = "nvidia,tegra114-spi"; + reg = <0x7000d600 0x200>; + interrupts = <0 82 0x04>; + nvidia,dma-request-selector = <&apbdma 16>; + spi-max-frequency = <25000000>; + #address-cells = <1>; + #size-cells = <0>; + status = "disabled"; +}; + diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index f80eee7..735e17b 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -397,6 +397,14 @@ config SPI_MXS help SPI driver for Freescale MXS devices. +config SPI_TEGRA114 + tristate "NVIDIA Tegra114 SPI Controller" + depends on ARCH_TEGRA && TEGRA20_APB_DMA + help + SPI driver for NVIDIA Tegra114 SPI Controller interface. This controller + is different than the older SoCs SPI controller and also register interface + get changed with this controller. + config SPI_TEGRA20_SFLASH tristate "Nvidia Tegra20 Serial flash Controller" depends on ARCH_TEGRA diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index e53c309..441db2b 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -63,6 +63,7 @@ obj-$(CONFIG_SPI_SH_HSPI) += spi-sh-hspi.o obj-$(CONFIG_SPI_SH_MSIOF) += spi-sh-msiof.o obj-$(CONFIG_SPI_SH_SCI) += spi-sh-sci.o obj-$(CONFIG_SPI_SIRF) += spi-sirf.o +obj-$(CONFIG_SPI_TEGRA114) += spi-tegra114.o obj-$(CONFIG_SPI_TEGRA20_SFLASH) += spi-tegra20-sflash.o obj-$(CONFIG_SPI_TEGRA20_SLINK) += spi-tegra20-slink.o obj-$(CONFIG_SPI_TI_SSP) += spi-ti-ssp.o diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c new file mode 100644 index 0000000..598eb45 --- /dev/null +++ b/drivers/spi/spi-tegra114.c @@ -0,0 +1,1246 @@ +/* + * SPI driver for NVIDIA's Tegra114 SPI Controller. + * + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/clk.h> +#include <linux/clk/tegra.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/spi/spi.h> + +#define SPI_COMMAND1 0x000 +#define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) +#define SPI_PACKED (1 << 5) +#define SPI_TX_EN (1 << 11) +#define SPI_RX_EN (1 << 12) +#define SPI_BOTH_EN_BYTE (1 << 13) +#define SPI_BOTH_EN_BIT (1 << 14) +#define SPI_LSBYTE_FE (1 << 15) +#define SPI_LSBIT_FE (1 << 16) +#define SPI_BIDIROE (1 << 17) +#define SPI_IDLE_SDA_DRIVE_LOW (0 << 18) +#define SPI_IDLE_SDA_DRIVE_HIGH (1 << 18) +#define SPI_IDLE_SDA_PULL_LOW (2 << 18) +#define SPI_IDLE_SDA_PULL_HIGH (3 << 18) +#define SPI_IDLE_SDA_MASK (3 << 18) +#define SPI_CS_SS_VAL (1 << 20) +#define SPI_CS_SW_HW (1 << 21) +/* SPI_CS_POL_INACTIVE bits are default high */ +#define SPI_CS_POL_INACTIVE 22 +#define SPI_CS_POL_INACTIVE_0 (1 << 22) +#define SPI_CS_POL_INACTIVE_1 (1 << 23) +#define SPI_CS_POL_INACTIVE_2 (1 << 24) +#define SPI_CS_POL_INACTIVE_3 (1 << 25) +#define SPI_CS_POL_INACTIVE_MASK (0xF << 22) + +#define SPI_CS_SEL_0 (0 << 26) +#define SPI_CS_SEL_1 (1 << 26) +#define SPI_CS_SEL_2 (2 << 26) +#define SPI_CS_SEL_3 (3 << 26) +#define SPI_CS_SEL_MASK (3 << 26) +#define SPI_CS_SEL(x) (((x) & 0x3) << 26) +#define SPI_CONTROL_MODE_0 (0 << 28) +#define SPI_CONTROL_MODE_1 (1 << 28) +#define SPI_CONTROL_MODE_2 (2 << 28) +#define SPI_CONTROL_MODE_3 (3 << 28) +#define SPI_CONTROL_MODE_MASK (3 << 28) +#define SPI_MODE_SEL(x) (((x) & 0x3) << 28) +#define SPI_M_S (1 << 30) +#define SPI_PIO (1 << 31) + +#define SPI_COMMAND2 0x004 +#define SPI_TX_TAP_DELAY(x) (((x) & 0x3F) << 6) +#define SPI_RX_TAP_DELAY(x) (((x) & 0x3F) << 0) + +#define SPI_CS_TIMING1 0x008 +#define SPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold)) +#define SPI_CS_SETUP_HOLD(reg, cs, val) \ + ((((val) & 0xFFu) << ((cs) * 8)) | \ + ((reg) & ~(0xFFu << ((cs) * 8)))) + +#define SPI_CS_TIMING2 0x00C +#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1F) << 0) +#define CS_ACTIVE_BETWEEN_PACKETS_0 (1 << 5) +#define CYCLES_BETWEEN_PACKETS_1(x) (((x) & 0x1F) << 8) +#define CS_ACTIVE_BETWEEN_PACKETS_1 (1 << 13) +#define CYCLES_BETWEEN_PACKETS_2(x) (((x) & 0x1F) << 16) +#define CS_ACTIVE_BETWEEN_PACKETS_2 (1 << 21) +#define CYCLES_BETWEEN_PACKETS_3(x) (((x) & 0x1F) << 24) +#define CS_ACTIVE_BETWEEN_PACKETS_3 (1 << 29) +#define SPI_SET_CS_ACTIVE_BETWEEN_PACKETS(reg, cs, val) \ + (reg = (((val) & 0x1) << ((cs) * 8 + 5)) | \ + ((reg) & ~(1 << ((cs) * 8 + 5)))) +#define SPI_SET_CYCLES_BETWEEN_PACKETS(reg, cs, val) \ + (reg = (((val) & 0xF) << ((cs) * 8)) | \ + ((reg) & ~(0xF << ((cs) * 8)))) + +#define SPI_TRANS_STATUS 0x010 +#define SPI_BLK_CNT(val) (((val) >> 0) & 0xFFFF) +#define SPI_SLV_IDLE_COUNT(val) (((val) >> 16) & 0xFF) +#define SPI_RDY (1 << 30) + +#define SPI_FIFO_STATUS 0x014 +#define SPI_RX_FIFO_EMPTY (1 << 0) +#define SPI_RX_FIFO_FULL (1 << 1) +#define SPI_TX_FIFO_EMPTY (1 << 2) +#define SPI_TX_FIFO_FULL (1 << 3) +#define SPI_RX_FIFO_UNF (1 << 4) +#define SPI_RX_FIFO_OVF (1 << 5) +#define SPI_TX_FIFO_UNF (1 << 6) +#define SPI_TX_FIFO_OVF (1 << 7) +#define SPI_ERR (1 << 8) +#define SPI_TX_FIFO_FLUSH (1 << 14) +#define SPI_RX_FIFO_FLUSH (1 << 15) +#define SPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7F) +#define SPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7F) +#define SPI_FRAME_END (1 << 30) +#define SPI_CS_INACTIVE (1 << 31) + +#define SPI_FIFO_ERROR (SPI_RX_FIFO_UNF | \ + SPI_RX_FIFO_OVF | SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF) +#define SPI_FIFO_EMPTY (SPI_RX_FIFO_EMPTY | SPI_TX_FIFO_EMPTY) + +#define SPI_TX_DATA 0x018 +#define SPI_RX_DATA 0x01C + +#define SPI_DMA_CTL 0x020 +#define SPI_TX_TRIG_1 (0 << 15) +#define SPI_TX_TRIG_4 (1 << 15) +#define SPI_TX_TRIG_8 (2 << 15) +#define SPI_TX_TRIG_16 (3 << 15) +#define SPI_TX_TRIG_MASK (3 << 15) +#define SPI_RX_TRIG_1 (0 << 19) +#define SPI_RX_TRIG_4 (1 << 19) +#define SPI_RX_TRIG_8 (2 << 19) +#define SPI_RX_TRIG_16 (3 << 19) +#define SPI_RX_TRIG_MASK (3 << 19) +#define SPI_IE_TX (1 << 28) +#define SPI_IE_RX (1 << 29) +#define SPI_CONT (1 << 30) +#define SPI_DMA (1 << 31) +#define SPI_DMA_EN SPI_DMA + +#define SPI_DMA_BLK 0x024 +#define SPI_DMA_BLK_SET(x) (((x) & 0xFFFF) << 0) + +#define SPI_TX_FIFO 0x108 +#define SPI_RX_FIFO 0x188 +#define MAX_CHIP_SELECT 4 +#define SPI_FIFO_DEPTH 64 +#define DATA_DIR_TX (1 << 0) +#define DATA_DIR_RX (1 << 1) + +#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) +#define DEFAULT_SPI_DMA_BUF_LEN (16*1024) +#define TX_FIFO_EMPTY_COUNT_MAX SPI_TX_FIFO_EMPTY_COUNT(0x40) +#define RX_FIFO_FULL_COUNT_ZERO SPI_RX_FIFO_FULL_COUNT(0) +#define MAX_HOLD_CYCLES 16 +#define SPI_DEFAULT_SPEED 25000000 + +#define MAX_CHIP_SELECT 4 +#define SPI_FIFO_DEPTH 64 + +struct tegra_spi_data { + struct device *dev; + struct spi_master *master; + spinlock_t lock; + + struct clk *clk; + void __iomem *base; + phys_addr_t phys; + unsigned irq; + int dma_req_sel; + u32 spi_max_frequency; + u32 cur_speed; + + struct spi_device *cur_spi; + unsigned cur_pos; + unsigned cur_len; + unsigned words_per_32bit; + unsigned bytes_per_word; + unsigned curr_dma_words; + unsigned cur_direction; + + unsigned cur_rx_pos; + unsigned cur_tx_pos; + + unsigned dma_buf_size; + unsigned max_buf_size; + bool is_curr_dma_xfer; + + struct completion rx_dma_complete; + struct completion tx_dma_complete; + + u32 tx_status; + u32 rx_status; + u32 status_reg; + bool is_packed; + unsigned long packed_size; + + u32 command1_reg; + u32 dma_control_reg; + u32 def_command1_reg; + u32 spi_cs_timing; + + struct completion xfer_completion; + struct spi_transfer *curr_xfer; + struct dma_chan *rx_dma_chan; + u32 *rx_dma_buf; + dma_addr_t rx_dma_phys; + struct dma_async_tx_descriptor *rx_dma_desc; + + struct dma_chan *tx_dma_chan; + u32 *tx_dma_buf; + dma_addr_t tx_dma_phys; + struct dma_async_tx_descriptor *tx_dma_desc; +}; + +static int tegra_spi_runtime_suspend(struct device *dev); +static int tegra_spi_runtime_resume(struct device *dev); + +static inline unsigned long tegra_spi_readl(struct tegra_spi_data *tspi, + unsigned long reg) +{ + return readl(tspi->base + reg); +} + +static inline void tegra_spi_writel(struct tegra_spi_data *tspi, + unsigned long val, unsigned long reg) +{ + writel(val, tspi->base + reg); + + /* Read back register to make sure that register writes completed */ + if (reg != SPI_TX_FIFO) + readl(tspi->base + SPI_COMMAND1); +} + +static void tegra_spi_clear_status(struct tegra_spi_data *tspi) +{ + unsigned long val; + + /* Write 1 to clear status register */ + val = tegra_spi_readl(tspi, SPI_TRANS_STATUS); + tegra_spi_writel(tspi, val, SPI_TRANS_STATUS); + + /* Clear fifo status error if any */ + val = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if (val & SPI_ERR) + tegra_spi_writel(tspi, SPI_ERR | SPI_FIFO_ERROR, + SPI_FIFO_STATUS); +} + +static unsigned tegra_spi_calculate_curr_xfer_param( + struct spi_device *spi, struct tegra_spi_data *tspi, + struct spi_transfer *t) +{ + unsigned remain_len = t->len - tspi->cur_pos; + unsigned max_word; + unsigned bits_per_word = t->bits_per_word; + unsigned max_len; + unsigned total_fifo_words; + + tspi->bytes_per_word = (bits_per_word - 1) / 8 + 1; + + if (bits_per_word == 8 || bits_per_word == 16) { + tspi->is_packed = 1; + tspi->words_per_32bit = 32/bits_per_word; + } else { + tspi->is_packed = 0; + tspi->words_per_32bit = 1; + } + + if (tspi->is_packed) { + max_len = min(remain_len, tspi->max_buf_size); + tspi->curr_dma_words = max_len/tspi->bytes_per_word; + total_fifo_words = (max_len + 3) / 4; + } else { + max_word = (remain_len - 1) / tspi->bytes_per_word + 1; + max_word = min(max_word, tspi->max_buf_size/4); + tspi->curr_dma_words = max_word; + total_fifo_words = max_word; + } + return total_fifo_words; +} + +static unsigned tegra_spi_fill_tx_fifo_from_client_txbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned nbytes; + unsigned tx_empty_count; + unsigned long fifo_status; + unsigned max_n_32bit; + unsigned i, count; + unsigned long x; + unsigned int written_words; + unsigned fifo_words_left; + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; + + fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + tx_empty_count = SPI_TX_FIFO_EMPTY_COUNT(fifo_status); + + if (tspi->is_packed) { + fifo_words_left = tx_empty_count * tspi->words_per_32bit; + written_words = min(fifo_words_left, tspi->curr_dma_words); + nbytes = written_words * tspi->bytes_per_word; + max_n_32bit = DIV_ROUND_UP(nbytes, 4); + for (count = 0; count < max_n_32bit; count++) { + x = 0; + for (i = 0; (i < 4) && nbytes; i++, nbytes--) + x |= (*tx_buf++) << (i*8); + tegra_spi_writel(tspi, x, SPI_TX_FIFO); + } + } else { + max_n_32bit = min(tspi->curr_dma_words, tx_empty_count); + written_words = max_n_32bit; + nbytes = written_words * tspi->bytes_per_word; + for (count = 0; count < max_n_32bit; count++) { + x = 0; + for (i = 0; nbytes && (i < tspi->bytes_per_word); + i++, nbytes--) + x |= ((*tx_buf++) << i*8); + tegra_spi_writel(tspi, x, SPI_TX_FIFO); + } + } + tspi->cur_tx_pos += written_words * tspi->bytes_per_word; + return written_words; +} + +static unsigned int tegra_spi_read_rx_fifo_to_client_rxbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned rx_full_count; + unsigned long fifo_status; + unsigned i, count; + unsigned long x; + unsigned int read_words = 0; + unsigned len; + u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_rx_pos; + + fifo_status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + rx_full_count = SPI_RX_FIFO_FULL_COUNT(fifo_status); + if (tspi->is_packed) { + len = tspi->curr_dma_words * tspi->bytes_per_word; + for (count = 0; count < rx_full_count; count++) { + x = tegra_spi_readl(tspi, SPI_RX_FIFO); + for (i = 0; len && (i < 4); i++, len--) + *rx_buf++ = (x >> i*8) & 0xFF; + } + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + read_words += tspi->curr_dma_words; + } else { + unsigned int rx_mask; + unsigned int bits_per_word = t->bits_per_word; + + rx_mask = (1 << bits_per_word) - 1; + for (count = 0; count < rx_full_count; count++) { + x = tegra_spi_readl(tspi, SPI_RX_FIFO); + x &= rx_mask; + for (i = 0; (i < tspi->bytes_per_word); i++) + *rx_buf++ = (x >> (i*8)) & 0xFF; + } + tspi->cur_rx_pos += rx_full_count * tspi->bytes_per_word; + read_words += rx_full_count; + } + return read_words; +} + +static void tegra_spi_copy_client_txbuf_to_spi_txbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned len; + + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tspi->dev, tspi->tx_dma_phys, + tspi->dma_buf_size, DMA_TO_DEVICE); + + if (tspi->is_packed) { + len = tspi->curr_dma_words * tspi->bytes_per_word; + memcpy(tspi->tx_dma_buf, t->tx_buf + tspi->cur_pos, len); + } else { + unsigned int i; + unsigned int count; + u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_tx_pos; + unsigned consume = tspi->curr_dma_words * tspi->bytes_per_word; + unsigned int x; + + for (count = 0; count < tspi->curr_dma_words; count++) { + x = 0; + for (i = 0; consume && (i < tspi->bytes_per_word); + i++, consume--) + x |= ((*tx_buf++) << i * 8); + tspi->tx_dma_buf[count] = x; + } + } + tspi->cur_tx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->tx_dma_phys, + tspi->dma_buf_size, DMA_TO_DEVICE); +} + +static void tegra_spi_copy_spi_rxbuf_to_client_rxbuf( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned len; + + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); + + if (tspi->is_packed) { + len = tspi->curr_dma_words * tspi->bytes_per_word; + memcpy(t->rx_buf + tspi->cur_rx_pos, tspi->rx_dma_buf, len); + } else { + unsigned int i; + unsigned int count; + unsigned char *rx_buf = t->rx_buf + tspi->cur_rx_pos; + unsigned int x; + unsigned int rx_mask; + unsigned int bits_per_word = t->bits_per_word; + + rx_mask = (1 << bits_per_word) - 1; + for (count = 0; count < tspi->curr_dma_words; count++) { + x = tspi->rx_dma_buf[count]; + x &= rx_mask; + for (i = 0; (i < tspi->bytes_per_word); i++) + *rx_buf++ = (x >> (i*8)) & 0xFF; + } + } + tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word; + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); +} + +static void tegra_spi_dma_complete(void *args) +{ + struct completion *dma_complete = args; + + complete(dma_complete); +} + +static int tegra_spi_start_tx_dma(struct tegra_spi_data *tspi, int len) +{ + INIT_COMPLETION(tspi->tx_dma_complete); + tspi->tx_dma_desc = dmaengine_prep_slave_single(tspi->tx_dma_chan, + tspi->tx_dma_phys, len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tspi->tx_dma_desc) { + dev_err(tspi->dev, "Not able to get desc for Tx\n"); + return -EIO; + } + + tspi->tx_dma_desc->callback = tegra_spi_dma_complete; + tspi->tx_dma_desc->callback_param = &tspi->tx_dma_complete; + + dmaengine_submit(tspi->tx_dma_desc); + dma_async_issue_pending(tspi->tx_dma_chan); + return 0; +} + +static int tegra_spi_start_rx_dma(struct tegra_spi_data *tspi, int len) +{ + INIT_COMPLETION(tspi->rx_dma_complete); + tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma_chan, + tspi->rx_dma_phys, len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tspi->rx_dma_desc) { + dev_err(tspi->dev, "Not able to get desc for Rx\n"); + return -EIO; + } + + tspi->rx_dma_desc->callback = tegra_spi_dma_complete; + tspi->rx_dma_desc->callback_param = &tspi->rx_dma_complete; + + dmaengine_submit(tspi->rx_dma_desc); + dma_async_issue_pending(tspi->rx_dma_chan); + return 0; +} + +static int tegra_spi_start_dma_based_transfer( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned long val; + unsigned int len; + int ret = 0; + unsigned long status; + + /* Make sure that Rx and Tx fifo are empty */ + status = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if ((status & SPI_FIFO_EMPTY) != SPI_FIFO_EMPTY) { + dev_err(tspi->dev, + "Rx/Tx fifo are not empty status 0x%08lx\n", status); + return -EIO; + } + + val = SPI_DMA_BLK_SET(tspi->curr_dma_words - 1); + tegra_spi_writel(tspi, val, SPI_DMA_BLK); + + if (tspi->is_packed) + len = DIV_ROUND_UP(tspi->curr_dma_words * tspi->bytes_per_word, + 4) * 4; + else + len = tspi->curr_dma_words * 4; + + /* Set attention level based on length of transfer */ + if (len & 0xF) + val |= SPI_TX_TRIG_1 | SPI_RX_TRIG_1; + else if (((len) >> 4) & 0x1) + val |= SPI_TX_TRIG_4 | SPI_RX_TRIG_4; + else + val |= SPI_TX_TRIG_8 | SPI_RX_TRIG_8; + + if (tspi->cur_direction & DATA_DIR_TX) + val |= SPI_IE_TX; + + if (tspi->cur_direction & DATA_DIR_RX) + val |= SPI_IE_RX; + + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + tspi->dma_control_reg = val; + + if (tspi->cur_direction & DATA_DIR_TX) { + tegra_spi_copy_client_txbuf_to_spi_txbuf(tspi, t); + ret = tegra_spi_start_tx_dma(tspi, len); + if (ret < 0) { + dev_err(tspi->dev, + "Starting tx dma failed, err %d\n", ret); + return ret; + } + } + + if (tspi->cur_direction & DATA_DIR_RX) { + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tspi->dev, tspi->rx_dma_phys, + tspi->dma_buf_size, DMA_FROM_DEVICE); + + ret = tegra_spi_start_rx_dma(tspi, len); + if (ret < 0) { + dev_err(tspi->dev, + "Starting rx dma failed, err %d\n", ret); + if (tspi->cur_direction & DATA_DIR_TX) + dmaengine_terminate_all(tspi->tx_dma_chan); + return ret; + } + } + tspi->is_curr_dma_xfer = true; + tspi->dma_control_reg = val; + + val |= SPI_DMA_EN; + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + return ret; +} + +static int tegra_spi_start_cpu_based_transfer( + struct tegra_spi_data *tspi, struct spi_transfer *t) +{ + unsigned long val; + unsigned cur_words; + + if (tspi->cur_direction & DATA_DIR_TX) + cur_words = tegra_spi_fill_tx_fifo_from_client_txbuf(tspi, t); + else + cur_words = tspi->curr_dma_words; + + val = SPI_DMA_BLK_SET(cur_words - 1); + tegra_spi_writel(tspi, val, SPI_DMA_BLK); + + val = 0; + if (tspi->cur_direction & DATA_DIR_TX) + val |= SPI_IE_TX; + + if (tspi->cur_direction & DATA_DIR_RX) + val |= SPI_IE_RX; + + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + tspi->dma_control_reg = val; + + tspi->is_curr_dma_xfer = false; + + val |= SPI_DMA_EN; + tegra_spi_writel(tspi, val, SPI_DMA_CTL); + return 0; +} + +static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi, + bool dma_to_memory) +{ + struct dma_chan *dma_chan; + u32 *dma_buf; + dma_addr_t dma_phys; + int ret; + struct dma_slave_config dma_sconfig; + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + dma_chan = dma_request_channel(mask, NULL, NULL); + if (!dma_chan) { + dev_err(tspi->dev, + "Dma channel is not available, will try later\n"); + return -EPROBE_DEFER; + } + + dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size, + &dma_phys, GFP_KERNEL); + if (!dma_buf) { + dev_err(tspi->dev, " Not able to allocate the dma buffer\n"); + dma_release_channel(dma_chan); + return -ENOMEM; + } + + dma_sconfig.slave_id = tspi->dma_req_sel; + if (dma_to_memory) { + dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO; + dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.src_maxburst = 0; + } else { + dma_sconfig.dst_addr = tspi->phys + SPI_TX_FIFO; + dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.dst_maxburst = 0; + } + + ret = dmaengine_slave_config(dma_chan, &dma_sconfig); + if (ret) + goto scrub; + if (dma_to_memory) { + tspi->rx_dma_chan = dma_chan; + tspi->rx_dma_buf = dma_buf; + tspi->rx_dma_phys = dma_phys; + } else { + tspi->tx_dma_chan = dma_chan; + tspi->tx_dma_buf = dma_buf; + tspi->tx_dma_phys = dma_phys; + } + return 0; + +scrub: + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); + dma_release_channel(dma_chan); + return ret; +} + +static void tegra_spi_deinit_dma_param(struct tegra_spi_data *tspi, + bool dma_to_memory) +{ + u32 *dma_buf; + dma_addr_t dma_phys; + struct dma_chan *dma_chan; + + if (dma_to_memory) { + dma_buf = tspi->rx_dma_buf; + dma_chan = tspi->rx_dma_chan; + dma_phys = tspi->rx_dma_phys; + tspi->rx_dma_chan = NULL; + tspi->rx_dma_buf = NULL; + } else { + dma_buf = tspi->tx_dma_buf; + dma_chan = tspi->tx_dma_chan; + dma_phys = tspi->tx_dma_phys; + tspi->tx_dma_buf = NULL; + tspi->tx_dma_chan = NULL; + } + if (!dma_chan) + return; + + dma_free_coherent(tspi->dev, tspi->dma_buf_size, dma_buf, dma_phys); + dma_release_channel(dma_chan); +} + +static int tegra_spi_start_transfer_one(struct spi_device *spi, + struct spi_transfer *t, bool is_first_of_msg, + bool is_single_xfer) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + u32 speed = t->speed_hz; + u8 bits_per_word = t->bits_per_word; + unsigned total_fifo_words; + int ret; + unsigned long command1; + int req_mode; + + if (speed != tspi->cur_speed) { + clk_set_rate(tspi->clk, speed); + tspi->cur_speed = speed; + } + + tspi->cur_spi = spi; + tspi->cur_pos = 0; + tspi->cur_rx_pos = 0; + tspi->cur_tx_pos = 0; + tspi->curr_xfer = t; + total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t); + + if (is_first_of_msg) { + tegra_spi_clear_status(tspi); + + command1 = tspi->def_command1_reg; + command1 |= SPI_BIT_LENGTH(bits_per_word - 1); + + command1 &= ~SPI_CONTROL_MODE_MASK; + req_mode = spi->mode & 0x3; + if (req_mode == SPI_MODE_0) + command1 |= SPI_CONTROL_MODE_0; + else if (req_mode == SPI_MODE_1) + command1 |= SPI_CONTROL_MODE_1; + else if (req_mode == SPI_MODE_2) + command1 |= SPI_CONTROL_MODE_2; + else if (req_mode == SPI_MODE_3) + command1 |= SPI_CONTROL_MODE_3; + + tegra_spi_writel(tspi, command1, SPI_COMMAND1); + + command1 |= SPI_CS_SW_HW; + if (spi->mode & SPI_CS_HIGH) + command1 |= SPI_CS_SS_VAL; + else + command1 &= ~SPI_CS_SS_VAL; + + tegra_spi_writel(tspi, 0, SPI_COMMAND2); + } else { + command1 = tspi->command1_reg; + command1 &= ~SPI_BIT_LENGTH(~0); + command1 |= SPI_BIT_LENGTH(bits_per_word - 1); + } + + if (tspi->is_packed) + command1 |= SPI_PACKED; + + command1 &= ~(SPI_CS_SEL_MASK | SPI_TX_EN | SPI_RX_EN); + tspi->cur_direction = 0; + if (t->rx_buf) { + command1 |= SPI_RX_EN; + tspi->cur_direction |= DATA_DIR_RX; + } + if (t->tx_buf) { + command1 |= SPI_TX_EN; + tspi->cur_direction |= DATA_DIR_TX; + } + command1 |= SPI_CS_SEL(spi->chip_select); + tegra_spi_writel(tspi, command1, SPI_COMMAND1); + tspi->command1_reg = command1; + + dev_dbg(tspi->dev, "The def 0x%x and written 0x%lx\n", + tspi->def_command1_reg, command1); + + if (total_fifo_words > SPI_FIFO_DEPTH) + ret = tegra_spi_start_dma_based_transfer(tspi, t); + else + ret = tegra_spi_start_cpu_based_transfer(tspi, t); + return ret; +} + +static int tegra_spi_setup(struct spi_device *spi) +{ + struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master); + unsigned long val; + unsigned long flags; + int ret; + unsigned int cs_pol_bit[MAX_CHIP_SELECT] = { + SPI_CS_POL_INACTIVE_0, + SPI_CS_POL_INACTIVE_1, + SPI_CS_POL_INACTIVE_2, + SPI_CS_POL_INACTIVE_3, + }; + + dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", + spi->bits_per_word, + spi->mode & SPI_CPOL ? "" : "~", + spi->mode & SPI_CPHA ? "" : "~", + spi->max_speed_hz); + + BUG_ON(spi->chip_select >= MAX_CHIP_SELECT); + + /* Set speed to the spi max fequency if spi device has not set */ + spi->max_speed_hz = spi->max_speed_hz ? : tspi->spi_max_frequency; + + ret = pm_runtime_get_sync(tspi->dev); + if (ret < 0) { + dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret); + return ret; + } + + spin_lock_irqsave(&tspi->lock, flags); + val = tspi->def_command1_reg; + if (spi->mode & SPI_CS_HIGH) + val &= ~cs_pol_bit[spi->chip_select]; + else + val |= cs_pol_bit[spi->chip_select]; + tspi->def_command1_reg = val; + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); + spin_unlock_irqrestore(&tspi->lock, flags); + + pm_runtime_put(tspi->dev); + return 0; +} + +static int tegra_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + bool is_first_msg = true; + int single_xfer; + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + struct spi_transfer *xfer; + struct spi_device *spi = msg->spi; + int ret; + + msg->status = 0; + msg->actual_length = 0; + + ret = pm_runtime_get_sync(tspi->dev); + if (ret < 0) { + dev_err(tspi->dev, "runtime PM get failed: %d\n", ret); + msg->status = ret; + spi_finalize_current_message(master); + return ret; + } + + single_xfer = list_is_singular(&msg->transfers); + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + INIT_COMPLETION(tspi->xfer_completion); + ret = tegra_spi_start_transfer_one(spi, xfer, + is_first_msg, single_xfer); + if (ret < 0) { + dev_err(tspi->dev, + "spi can not start transfer, err %d\n", ret); + goto exit; + } + is_first_msg = false; + ret = wait_for_completion_timeout(&tspi->xfer_completion, + SPI_DMA_TIMEOUT); + if (WARN_ON(ret == 0)) { + dev_err(tspi->dev, + "spi trasfer timeout, err %d\n", ret); + ret = -EIO; + goto exit; + } + + if (tspi->tx_status || tspi->rx_status) { + dev_err(tspi->dev, "Error in Transfer\n"); + ret = -EIO; + goto exit; + } + msg->actual_length += xfer->len; + if (xfer->cs_change && xfer->delay_usecs) { + tegra_spi_writel(tspi, tspi->def_command1_reg, + SPI_COMMAND1); + udelay(xfer->delay_usecs); + } + } + ret = 0; +exit: + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); + pm_runtime_put(tspi->dev); + msg->status = ret; + spi_finalize_current_message(master); + return ret; +} + +static irqreturn_t handle_cpu_based_xfer(struct tegra_spi_data *tspi) +{ + struct spi_transfer *t = tspi->curr_xfer; + unsigned long flags; + + spin_lock_irqsave(&tspi->lock, flags); + if (tspi->tx_status || tspi->rx_status) { + dev_err(tspi->dev, "CpuXfer ERROR bit set 0x%x\n", + tspi->status_reg); + dev_err(tspi->dev, "CpuXfer 0x%08x:0x%08x\n", + tspi->command1_reg, tspi->dma_control_reg); + tegra_periph_reset_assert(tspi->clk); + udelay(2); + tegra_periph_reset_deassert(tspi->clk); + complete(&tspi->xfer_completion); + goto exit; + } + + if (tspi->cur_direction & DATA_DIR_RX) + tegra_spi_read_rx_fifo_to_client_rxbuf(tspi, t); + + if (tspi->cur_direction & DATA_DIR_TX) + tspi->cur_pos = tspi->cur_tx_pos; + else + tspi->cur_pos = tspi->cur_rx_pos; + + if (tspi->cur_pos == t->len) { + complete(&tspi->xfer_completion); + goto exit; + } + + tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, tspi, t); + tegra_spi_start_cpu_based_transfer(tspi, t); +exit: + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t handle_dma_based_xfer(struct tegra_spi_data *tspi) +{ + struct spi_transfer *t = tspi->curr_xfer; + long wait_status; + int err = 0; + unsigned total_fifo_words; + unsigned long flags; + + /* Abort dmas if any error */ + if (tspi->cur_direction & DATA_DIR_TX) { + if (tspi->tx_status) { + dmaengine_terminate_all(tspi->tx_dma_chan); + err += 1; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tspi->tx_dma_complete, SPI_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tspi->tx_dma_chan); + dev_err(tspi->dev, "TxDma Xfer failed\n"); + err += 1; + } + } + } + + if (tspi->cur_direction & DATA_DIR_RX) { + if (tspi->rx_status) { + dmaengine_terminate_all(tspi->rx_dma_chan); + err += 2; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tspi->rx_dma_complete, SPI_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tspi->rx_dma_chan); + dev_err(tspi->dev, "RxDma Xfer failed\n"); + err += 2; + } + } + } + + spin_lock_irqsave(&tspi->lock, flags); + if (err) { + dev_err(tspi->dev, "DmaXfer: ERROR bit set 0x%x\n", + tspi->status_reg); + dev_err(tspi->dev, "DmaXfer 0x%08x:0x%08x\n", + tspi->command1_reg, tspi->dma_control_reg); + tegra_periph_reset_assert(tspi->clk); + udelay(2); + tegra_periph_reset_deassert(tspi->clk); + complete(&tspi->xfer_completion); + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; + } + + if (tspi->cur_direction & DATA_DIR_RX) + tegra_spi_copy_spi_rxbuf_to_client_rxbuf(tspi, t); + + if (tspi->cur_direction & DATA_DIR_TX) + tspi->cur_pos = tspi->cur_tx_pos; + else + tspi->cur_pos = tspi->cur_rx_pos; + + if (tspi->cur_pos == t->len) { + complete(&tspi->xfer_completion); + goto exit; + } + + /* Continue transfer in current message */ + total_fifo_words = tegra_spi_calculate_curr_xfer_param(tspi->cur_spi, + tspi, t); + if (total_fifo_words > SPI_FIFO_DEPTH) + err = tegra_spi_start_dma_based_transfer(tspi, t); + else + err = tegra_spi_start_cpu_based_transfer(tspi, t); + +exit: + spin_unlock_irqrestore(&tspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t tegra_spi_isr_thread(int irq, void *context_data) +{ + struct tegra_spi_data *tspi = context_data; + + if (!tspi->is_curr_dma_xfer) + return handle_cpu_based_xfer(tspi); + return handle_dma_based_xfer(tspi); +} + +static irqreturn_t tegra_spi_isr(int irq, void *context_data) +{ + struct tegra_spi_data *tspi = context_data; + + tspi->status_reg = tegra_spi_readl(tspi, SPI_FIFO_STATUS); + if (tspi->cur_direction & DATA_DIR_TX) + tspi->tx_status = tspi->status_reg & + (SPI_TX_FIFO_UNF | SPI_TX_FIFO_OVF); + + if (tspi->cur_direction & DATA_DIR_RX) + tspi->rx_status = tspi->status_reg & + (SPI_RX_FIFO_OVF | SPI_RX_FIFO_UNF); + tegra_spi_clear_status(tspi); + + return IRQ_WAKE_THREAD; +} + +static void tegra_spi_parse_dt(struct platform_device *pdev, + struct tegra_spi_data *tspi) +{ + struct device_node *np = pdev->dev.of_node; + u32 of_dma[2]; + + if (of_property_read_u32_array(np, "nvidia,dma-request-selector", + of_dma, 2) >= 0) + tspi->dma_req_sel = of_dma[1]; + + if (of_property_read_u32(np, "spi-max-frequency", + &tspi->spi_max_frequency)) + tspi->spi_max_frequency = 25000000; /* 25MHz */ +} + +static struct of_device_id tegra_spi_of_match[] = { + { .compatible = "nvidia,tegra114-spi", }, + {} +}; +MODULE_DEVICE_TABLE(of, tegra_spi_of_match); + +static int tegra_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct tegra_spi_data *tspi; + struct resource *r; + int ret, spi_irq; + + master = spi_alloc_master(&pdev->dev, sizeof(*tspi)); + if (!master) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + dev_set_drvdata(&pdev->dev, master); + tspi = spi_master_get_devdata(master); + + /* Parse DT */ + tegra_spi_parse_dt(pdev, tspi); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->setup = tegra_spi_setup; + master->transfer_one_message = tegra_spi_transfer_one_message; + master->num_chipselect = MAX_CHIP_SELECT; + master->bus_num = -1; + + tspi->master = master; + tspi->dev = &pdev->dev; + spin_lock_init(&tspi->lock); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + dev_err(&pdev->dev, "No IO memory resource\n"); + ret = -ENODEV; + goto exit_free_master; + } + tspi->phys = r->start; + tspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(tspi->base)) { + ret = PTR_ERR(tspi->base); + dev_err(&pdev->dev, "ioremap failed: err = %d\n", ret); + goto exit_free_master; + } + + spi_irq = platform_get_irq(pdev, 0); + tspi->irq = spi_irq; + ret = request_threaded_irq(tspi->irq, tegra_spi_isr, + tegra_spi_isr_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), tspi); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", + tspi->irq); + goto exit_free_master; + } + + tspi->clk = devm_clk_get(&pdev->dev, "spi"); + if (IS_ERR(tspi->clk)) { + dev_err(&pdev->dev, "can not get clock\n"); + ret = PTR_ERR(tspi->clk); + goto exit_free_irq; + } + + tspi->max_buf_size = SPI_FIFO_DEPTH << 2; + tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; + + if (tspi->dma_req_sel) { + ret = tegra_spi_init_dma_param(tspi, true); + if (ret < 0) { + dev_err(&pdev->dev, "RxDma Init failed, err %d\n", ret); + goto exit_free_irq; + } + + ret = tegra_spi_init_dma_param(tspi, false); + if (ret < 0) { + dev_err(&pdev->dev, "TxDma Init failed, err %d\n", ret); + goto exit_rx_dma_free; + } + tspi->max_buf_size = tspi->dma_buf_size; + init_completion(&tspi->tx_dma_complete); + init_completion(&tspi->rx_dma_complete); + } + + init_completion(&tspi->xfer_completion); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = tegra_spi_runtime_resume(&pdev->dev); + if (ret) + goto exit_pm_disable; + } + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); + goto exit_pm_disable; + } + tspi->def_command1_reg = SPI_M_S; + tegra_spi_writel(tspi, tspi->def_command1_reg, SPI_COMMAND1); + pm_runtime_put(&pdev->dev); + + master->dev.of_node = pdev->dev.of_node; + ret = spi_register_master(master); + if (ret < 0) { + dev_err(&pdev->dev, "can not register to master err %d\n", ret); + goto exit_pm_disable; + } + return ret; + +exit_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_spi_runtime_suspend(&pdev->dev); + tegra_spi_deinit_dma_param(tspi, false); +exit_rx_dma_free: + tegra_spi_deinit_dma_param(tspi, true); +exit_free_irq: + free_irq(spi_irq, tspi); +exit_free_master: + spi_master_put(master); + return ret; +} + +static int tegra_spi_remove(struct platform_device *pdev) +{ + struct spi_master *master = dev_get_drvdata(&pdev->dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + + free_irq(tspi->irq, tspi); + spi_unregister_master(master); + + if (tspi->tx_dma_chan) + tegra_spi_deinit_dma_param(tspi, false); + + if (tspi->rx_dma_chan) + tegra_spi_deinit_dma_param(tspi, true); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_spi_runtime_suspend(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_spi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +static int tegra_spi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + dev_err(dev, "pm runtime failed, e = %d\n", ret); + return ret; + } + tegra_spi_writel(tspi, tspi->command1_reg, SPI_COMMAND1); + pm_runtime_put(dev); + + return spi_master_resume(master); +} +#endif + +static int tegra_spi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + + /* Flush all write which are in PPSB queue by reading back */ + tegra_spi_readl(tspi, SPI_COMMAND1); + + clk_disable_unprepare(tspi->clk); + return 0; +} + +static int tegra_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_spi_data *tspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(tspi->clk); + if (ret < 0) { + dev_err(tspi->dev, "clk_prepare failed: %d\n", ret); + return ret; + } + return 0; +} + +static const struct dev_pm_ops tegra_spi_pm_ops = { + SET_RUNTIME_PM_OPS(tegra_spi_runtime_suspend, + tegra_spi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(tegra_spi_suspend, tegra_spi_resume) +}; +static struct platform_driver tegra_spi_driver = { + .driver = { + .name = "spi-tegra114", + .owner = THIS_MODULE, + .pm = &tegra_spi_pm_ops, + .of_match_table = tegra_spi_of_match, + }, + .probe = tegra_spi_probe, + .remove = tegra_spi_remove, +}; +module_platform_driver(tegra_spi_driver); + +MODULE_ALIAS("platform:spi-tegra114"); +MODULE_DESCRIPTION("NVIDIA Tegra114 SPI Controller Driver"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2");