From: Stephen Warren <swarren@xxxxxxxxxx>
The current SPI driver has many issues. Examples are:
* Segfaulting on most transfers due to expecting all transfers to have
both RX and TX buffers.
* Hanging on TX transfers since the whole driver flow is driven by RX
DMA completion, but the HW is only told to enable RX for RX transfers.
* Use of clk_disable_unprepare() from atomic context.
* Once those and other minor issues are fixed, the driver still doesn't
actually work.
* The driver also implements a deprecated API to the SPI core.
For this reason, simply remove the driver completely. This has two
advantages:
1) This will remove the last use of Tegra's <mach/dma.h>, which will
allow that file to be removed, which is required for single zImage
work.
2) The downstream driver is significaly different from the current
code. I believe a patch to re-add the downstream driver (with
appropriate cleanup) will be much simpler to review if it's a new
file rather than randomly interspered with essentially unrelated
existing code.
Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>
---
Mark,
If this can be taken through the SPI tree for 3.7 that'd be great. If
it needs to be deferred to 3.8, we will need to start talking dependencies,
since I'd like to take a patch through the Tegra tree to delete mach/dma.h
in 3.8.
---
drivers/spi/Kconfig | 6 -
drivers/spi/Makefile | 1 -
drivers/spi/spi-tegra.c | 702 -----------------------------------------------
3 files changed, 0 insertions(+), 709 deletions(-)
delete mode 100644 drivers/spi/spi-tegra.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 63a7943..ecc31a1 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -377,12 +377,6 @@ config SPI_MXS
help
SPI driver for Freescale MXS devices.
-config SPI_TEGRA
- tristate "Nvidia Tegra SPI controller"
- depends on ARCH_TEGRA && (TEGRA_SYSTEM_DMA || TEGRA20_APB_DMA)
- help
- SPI driver for NVidia Tegra SoCs
-
config SPI_TI_SSP
tristate "TI Sequencer Serial Port - SPI Support"
depends on MFD_TI_SSP
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 9387056..22fd3a7 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -59,7 +59,6 @@ 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_STMP3XXX) += spi-stmp.o
-obj-$(CONFIG_SPI_TEGRA) += spi-tegra.o
obj-$(CONFIG_SPI_TI_SSP) += spi-ti-ssp.o
obj-$(CONFIG_SPI_TLE62X0) += spi-tle62x0.o
obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi-topcliff-pch.o
diff --git a/drivers/spi/spi-tegra.c b/drivers/spi/spi-tegra.c
deleted file mode 100644
index e28445d..0000000
--- a/drivers/spi/spi-tegra.c
+++ /dev/null
@@ -1,702 +0,0 @@
-/*
- * Driver for Nvidia TEGRA spi controller.
- *
- * Copyright (C) 2010 Google, Inc.
- *
- * Author:
- * Erik Gilling <konkers@xxxxxxxxxxx>
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that 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.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/err.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/dma-mapping.h>
-#include <linux/dmapool.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-
-#include <linux/spi/spi.h>
-#include <linux/dmaengine.h>
-
-#include <mach/dma.h>
-
-#define SLINK_COMMAND 0x000
-#define SLINK_BIT_LENGTH(x) (((x) & 0x1f) << 0)
-#define SLINK_WORD_SIZE(x) (((x) & 0x1f) << 5)
-#define SLINK_BOTH_EN (1 << 10)
-#define SLINK_CS_SW (1 << 11)
-#define SLINK_CS_VALUE (1 << 12)
-#define SLINK_CS_POLARITY (1 << 13)
-#define SLINK_IDLE_SDA_DRIVE_LOW (0 << 16)
-#define SLINK_IDLE_SDA_DRIVE_HIGH (1 << 16)
-#define SLINK_IDLE_SDA_PULL_LOW (2 << 16)
-#define SLINK_IDLE_SDA_PULL_HIGH (3 << 16)
-#define SLINK_IDLE_SDA_MASK (3 << 16)
-#define SLINK_CS_POLARITY1 (1 << 20)
-#define SLINK_CK_SDA (1 << 21)
-#define SLINK_CS_POLARITY2 (1 << 22)
-#define SLINK_CS_POLARITY3 (1 << 23)
-#define SLINK_IDLE_SCLK_DRIVE_LOW (0 << 24)
-#define SLINK_IDLE_SCLK_DRIVE_HIGH (1 << 24)
-#define SLINK_IDLE_SCLK_PULL_LOW (2 << 24)
-#define SLINK_IDLE_SCLK_PULL_HIGH (3 << 24)
-#define SLINK_IDLE_SCLK_MASK (3 << 24)
-#define SLINK_M_S (1 << 28)
-#define SLINK_WAIT (1 << 29)
-#define SLINK_GO (1 << 30)
-#define SLINK_ENB (1 << 31)
-
-#define SLINK_COMMAND2 0x004
-#define SLINK_LSBFE (1 << 0)
-#define SLINK_SSOE (1 << 1)
-#define SLINK_SPIE (1 << 4)
-#define SLINK_BIDIROE (1 << 6)
-#define SLINK_MODFEN (1 << 7)
-#define SLINK_INT_SIZE(x) (((x) & 0x1f) << 8)
-#define SLINK_CS_ACTIVE_BETWEEN (1 << 17)
-#define SLINK_SS_EN_CS(x) (((x) & 0x3) << 18)
-#define SLINK_SS_SETUP(x) (((x) & 0x3) << 20)
-#define SLINK_FIFO_REFILLS_0 (0 << 22)
-#define SLINK_FIFO_REFILLS_1 (1 << 22)
-#define SLINK_FIFO_REFILLS_2 (2 << 22)
-#define SLINK_FIFO_REFILLS_3 (3 << 22)
-#define SLINK_FIFO_REFILLS_MASK (3 << 22)
-#define SLINK_WAIT_PACK_INT(x) (((x) & 0x7) << 26)
-#define SLINK_SPC0 (1 << 29)
-#define SLINK_TXEN (1 << 30)
-#define SLINK_RXEN (1 << 31)
-
-#define SLINK_STATUS 0x008
-#define SLINK_COUNT(val) (((val) >> 0) & 0x1f)
-#define SLINK_WORD(val) (((val) >> 5) & 0x1f)
-#define SLINK_BLK_CNT(val) (((val) >> 0) & 0xffff)
-#define SLINK_MODF (1 << 16)
-#define SLINK_RX_UNF (1 << 18)
-#define SLINK_TX_OVF (1 << 19)
-#define SLINK_TX_FULL (1 << 20)
-#define SLINK_TX_EMPTY (1 << 21)
-#define SLINK_RX_FULL (1 << 22)
-#define SLINK_RX_EMPTY (1 << 23)
-#define SLINK_TX_UNF (1 << 24)
-#define SLINK_RX_OVF (1 << 25)
-#define SLINK_TX_FLUSH (1 << 26)
-#define SLINK_RX_FLUSH (1 << 27)
-#define SLINK_SCLK (1 << 28)
-#define SLINK_ERR (1 << 29)
-#define SLINK_RDY (1 << 30)
-#define SLINK_BSY (1 << 31)
-
-#define SLINK_MAS_DATA 0x010
-#define SLINK_SLAVE_DATA 0x014
-
-#define SLINK_DMA_CTL 0x018
-#define SLINK_DMA_BLOCK_SIZE(x) (((x) & 0xffff) << 0)
-#define SLINK_TX_TRIG_1 (0 << 16)
-#define SLINK_TX_TRIG_4 (1 << 16)
-#define SLINK_TX_TRIG_8 (2 << 16)
-#define SLINK_TX_TRIG_16 (3 << 16)
-#define SLINK_TX_TRIG_MASK (3 << 16)
-#define SLINK_RX_TRIG_1 (0 << 18)
-#define SLINK_RX_TRIG_4 (1 << 18)
-#define SLINK_RX_TRIG_8 (2 << 18)
-#define SLINK_RX_TRIG_16 (3 << 18)
-#define SLINK_RX_TRIG_MASK (3 << 18)
-#define SLINK_PACKED (1 << 20)
-#define SLINK_PACK_SIZE_4 (0 << 21)
-#define SLINK_PACK_SIZE_8 (1 << 21)
-#define SLINK_PACK_SIZE_16 (2 << 21)
-#define SLINK_PACK_SIZE_32 (3 << 21)
-#define SLINK_PACK_SIZE_MASK (3 << 21)
-#define SLINK_IE_TXC (1 << 26)
-#define SLINK_IE_RXC (1 << 27)
-#define SLINK_DMA_EN (1 << 31)
-
-#define SLINK_STATUS2 0x01c
-#define SLINK_TX_FIFO_EMPTY_COUNT(val) (((val) & 0x3f) >> 0)
-#define SLINK_RX_FIFO_FULL_COUNT(val) (((val) & 0x3f) >> 16)
-
-#define SLINK_TX_FIFO 0x100
-#define SLINK_RX_FIFO 0x180
-
-static const unsigned long spi_tegra_req_sels[] = {
- TEGRA_DMA_REQ_SEL_SL2B1,
- TEGRA_DMA_REQ_SEL_SL2B2,
- TEGRA_DMA_REQ_SEL_SL2B3,
- TEGRA_DMA_REQ_SEL_SL2B4,
-};
-
-#define BB_LEN 32
-
-struct spi_tegra_data {
- struct spi_master *master;
- struct platform_device *pdev;
- spinlock_t lock;
-
- struct clk *clk;
- void __iomem *base;
- unsigned long phys;
-
- u32 cur_speed;
-
- struct list_head queue;
- struct spi_transfer *cur;
- unsigned cur_pos;
- unsigned cur_len;
- unsigned cur_bytes_per_word;
-
- /* The tegra spi controller has a bug which causes the first word
- * in PIO transactions to be garbage. Since packed DMA transactions
- * require transfers to be 4 byte aligned we need a bounce buffer
- * for the generic case.
- */
- int dma_req_len;
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
- struct tegra_dma_req rx_dma_req;
- struct tegra_dma_channel *rx_dma;
-#else
- struct dma_chan *rx_dma;
- struct dma_slave_config sconfig;
- struct dma_async_tx_descriptor *rx_dma_desc;
- dma_cookie_t rx_cookie;
-#endif
- u32 *rx_bb;
- dma_addr_t rx_bb_phys;
-};
-
-#if !defined(CONFIG_TEGRA_SYSTEM_DMA)
-static void tegra_spi_rx_dma_complete(void *args);
-#endif
-
-static inline unsigned long spi_tegra_readl(struct spi_tegra_data *tspi,
- unsigned long reg)
-{
- return readl(tspi->base + reg);
-}
-
-static inline void spi_tegra_writel(struct spi_tegra_data *tspi,
- unsigned long val,
- unsigned long reg)
-{
- writel(val, tspi->base + reg);
-}
-
-static void spi_tegra_go(struct spi_tegra_data *tspi)
-{
- unsigned long val;
-
- wmb();
-
- val = spi_tegra_readl(tspi, SLINK_DMA_CTL);
- val &= ~SLINK_DMA_BLOCK_SIZE(~0) & ~SLINK_DMA_EN;
- val |= SLINK_DMA_BLOCK_SIZE(tspi->dma_req_len / 4 - 1);
- spi_tegra_writel(tspi, val, SLINK_DMA_CTL);
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
- tspi->rx_dma_req.size = tspi->dma_req_len;
- tegra_dma_enqueue_req(tspi->rx_dma, &tspi->rx_dma_req);
-#else
- tspi->rx_dma_desc = dmaengine_prep_slave_single(tspi->rx_dma,
- tspi->rx_bb_phys, tspi->dma_req_len,
- DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
- if (!tspi->rx_dma_desc) {
- dev_err(&tspi->pdev->dev, "dmaengine slave prep failed\n");
- return;
- }
- tspi->rx_dma_desc->callback = tegra_spi_rx_dma_complete;
- tspi->rx_dma_desc->callback_param = tspi;
- tspi->rx_cookie = dmaengine_submit(tspi->rx_dma_desc);
- dma_async_issue_pending(tspi->rx_dma);
-#endif
-
- val |= SLINK_DMA_EN;
- spi_tegra_writel(tspi, val, SLINK_DMA_CTL);
-}
-
-static unsigned spi_tegra_fill_tx_fifo(struct spi_tegra_data *tspi,
- struct spi_transfer *t)
-{
- unsigned len = min(t->len - tspi->cur_pos, BB_LEN *
- tspi->cur_bytes_per_word);
- u8 *tx_buf = (u8 *)t->tx_buf + tspi->cur_pos;
- int i, j;
- unsigned long val;
-
- val = spi_tegra_readl(tspi, SLINK_COMMAND);
- val &= ~SLINK_WORD_SIZE(~0);
- val |= SLINK_WORD_SIZE(len / tspi->cur_bytes_per_word - 1);
- spi_tegra_writel(tspi, val, SLINK_COMMAND);
-
- for (i = 0; i < len; i += tspi->cur_bytes_per_word) {
- val = 0;
- for (j = 0; j < tspi->cur_bytes_per_word; j++)
- val |= tx_buf[i + j] << j * 8;
-
- spi_tegra_writel(tspi, val, SLINK_TX_FIFO);
- }
-
- tspi->dma_req_len = len / tspi->cur_bytes_per_word * 4;
-
- return len;
-}
-
-static unsigned spi_tegra_drain_rx_fifo(struct spi_tegra_data *tspi,
- struct spi_transfer *t)
-{
- unsigned len = tspi->cur_len;
- u8 *rx_buf = (u8 *)t->rx_buf + tspi->cur_pos;
- int i, j;
- unsigned long val;
-
- for (i = 0; i < len; i += tspi->cur_bytes_per_word) {
- val = tspi->rx_bb[i / tspi->cur_bytes_per_word];
- for (j = 0; j < tspi->cur_bytes_per_word; j++)
- rx_buf[i + j] = (val >> (j * 8)) & 0xff;
- }
-
- return len;
-}
-
-static void spi_tegra_start_transfer(struct spi_device *spi,
- struct spi_transfer *t)
-{
- struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master);
- u32 speed;
- u8 bits_per_word;
- unsigned long val;
-
- speed = t->speed_hz ? t->speed_hz : spi->max_speed_hz;
- bits_per_word = t->bits_per_word ? t->bits_per_word :
- spi->bits_per_word;
-
- tspi->cur_bytes_per_word = (bits_per_word - 1) / 8 + 1;
-
- if (speed != tspi->cur_speed)
- clk_set_rate(tspi->clk, speed);
-
- if (tspi->cur_speed == 0)
- clk_prepare_enable(tspi->clk);
-
- tspi->cur_speed = speed;
-
- val = spi_tegra_readl(tspi, SLINK_COMMAND2);
- val &= ~SLINK_SS_EN_CS(~0) | SLINK_RXEN | SLINK_TXEN;
- if (t->rx_buf)
- val |= SLINK_RXEN;
- if (t->tx_buf)
- val |= SLINK_TXEN;
- val |= SLINK_SS_EN_CS(spi->chip_select);
- val |= SLINK_SPIE;
- spi_tegra_writel(tspi, val, SLINK_COMMAND2);
-
- val = spi_tegra_readl(tspi, SLINK_COMMAND);
- val &= ~SLINK_BIT_LENGTH(~0);
- val |= SLINK_BIT_LENGTH(bits_per_word - 1);
-
- /* FIXME: should probably control CS manually so that we can be sure
- * it does not go low between transfer and to support delay_usecs
- * correctly.
- */
- val &= ~SLINK_IDLE_SCLK_MASK & ~SLINK_CK_SDA & ~SLINK_CS_SW;
-
- if (spi->mode & SPI_CPHA)
- val |= SLINK_CK_SDA;
-
- if (spi->mode & SPI_CPOL)
- val |= SLINK_IDLE_SCLK_DRIVE_HIGH;
- else
- val |= SLINK_IDLE_SCLK_DRIVE_LOW;
-
- val |= SLINK_M_S;
-
- spi_tegra_writel(tspi, val, SLINK_COMMAND);
-
- spi_tegra_writel(tspi, SLINK_RX_FLUSH | SLINK_TX_FLUSH, SLINK_STATUS);
-
- tspi->cur = t;
- tspi->cur_pos = 0;
- tspi->cur_len = spi_tegra_fill_tx_fifo(tspi, t);
-
- spi_tegra_go(tspi);
-}
-
-static void spi_tegra_start_message(struct spi_device *spi,
- struct spi_message *m)
-{
- struct spi_transfer *t;
-
- m->actual_length = 0;
- m->status = 0;
-
- t = list_first_entry(&m->transfers, struct spi_transfer, transfer_list);
- spi_tegra_start_transfer(spi, t);
-}
-
-static void handle_spi_rx_dma_complete(struct spi_tegra_data *tspi)
-{
- unsigned long flags;
- struct spi_message *m;
- struct spi_device *spi;
- int timeout = 0;
- unsigned long val;
-
- /* the SPI controller may come back with both the BSY and RDY bits
- * set. In this case we need to wait for the BSY bit to clear so
- * that we are sure the DMA is finished. 1000 reads was empirically
- * determined to be long enough.
- */
- while (timeout++ < 1000) {
- if (!(spi_tegra_readl(tspi, SLINK_STATUS) & SLINK_BSY))
- break;
- }
-
- spin_lock_irqsave(&tspi->lock, flags);
-
- val = spi_tegra_readl(tspi, SLINK_STATUS);
- val |= SLINK_RDY;
- spi_tegra_writel(tspi, val, SLINK_STATUS);
-
- m = list_first_entry(&tspi->queue, struct spi_message, queue);
-
- if (timeout >= 1000)
- m->status = -EIO;
-
- spi = m->state;
-
- tspi->cur_pos += spi_tegra_drain_rx_fifo(tspi, tspi->cur);
- m->actual_length += tspi->cur_pos;
-
- if (tspi->cur_pos < tspi->cur->len) {
- tspi->cur_len = spi_tegra_fill_tx_fifo(tspi, tspi->cur);
- spi_tegra_go(tspi);
- } else if (!list_is_last(&tspi->cur->transfer_list,
- &m->transfers)) {
- tspi->cur = list_first_entry(&tspi->cur->transfer_list,
- struct spi_transfer,
- transfer_list);
- spi_tegra_start_transfer(spi, tspi->cur);
- } else {
- list_del(&m->queue);
-
- m->complete(m->context);
-
- if (!list_empty(&tspi->queue)) {
- m = list_first_entry(&tspi->queue, struct spi_message,
- queue);
- spi = m->state;
- spi_tegra_start_message(spi, m);
- } else {
- clk_disable_unprepare(tspi->clk);
- tspi->cur_speed = 0;
- }
- }
-
- spin_unlock_irqrestore(&tspi->lock, flags);
-}
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
-static void tegra_spi_rx_dma_complete(struct tegra_dma_req *req)
-{
- struct spi_tegra_data *tspi = req->dev;
- handle_spi_rx_dma_complete(tspi);
-}
-#else
-static void tegra_spi_rx_dma_complete(void *args)
-{
- struct spi_tegra_data *tspi = args;
- handle_spi_rx_dma_complete(tspi);
-}
-#endif
-
-static int spi_tegra_setup(struct spi_device *spi)
-{
- struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master);
- unsigned long cs_bit;
- unsigned long val;
- unsigned long flags;
-
- 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);
-
-
- switch (spi->chip_select) {
- case 0:
- cs_bit = SLINK_CS_POLARITY;
- break;
-
- case 1:
- cs_bit = SLINK_CS_POLARITY1;
- break;
-
- case 2:
- cs_bit = SLINK_CS_POLARITY2;
- break;
-
- case 4:
- cs_bit = SLINK_CS_POLARITY3;
- break;
-
- default:
- return -EINVAL;
- }
-
- spin_lock_irqsave(&tspi->lock, flags);
-
- val = spi_tegra_readl(tspi, SLINK_COMMAND);
- if (spi->mode & SPI_CS_HIGH)
- val |= cs_bit;
- else
- val &= ~cs_bit;
- spi_tegra_writel(tspi, val, SLINK_COMMAND);
-
- spin_unlock_irqrestore(&tspi->lock, flags);
-
- return 0;
-}
-
-static int spi_tegra_transfer(struct spi_device *spi, struct spi_message *m)
-{
- struct spi_tegra_data *tspi = spi_master_get_devdata(spi->master);
- struct spi_transfer *t;
- unsigned long flags;
- int was_empty;
-
- if (list_empty(&m->transfers) || !m->complete)
- return -EINVAL;
-
- list_for_each_entry(t, &m->transfers, transfer_list) {
- if (t->bits_per_word < 0 || t->bits_per_word > 32)
- return -EINVAL;
-
- if (t->len == 0)
- return -EINVAL;
-
- if (!t->rx_buf && !t->tx_buf)
- return -EINVAL;
- }
-
- m->state = spi;
-
- spin_lock_irqsave(&tspi->lock, flags);
- was_empty = list_empty(&tspi->queue);
- list_add_tail(&m->queue, &tspi->queue);
-
- if (was_empty)
- spi_tegra_start_message(spi, m);
-
- spin_unlock_irqrestore(&tspi->lock, flags);
-
- return 0;
-}
-
-static int __devinit spi_tegra_probe(struct platform_device *pdev)
-{
- struct spi_master *master;
- struct spi_tegra_data *tspi;
- struct resource *r;
- int ret;
-#if !defined(CONFIG_TEGRA_SYSTEM_DMA)
- dma_cap_mask_t mask;
-#endif
-
- master = spi_alloc_master(&pdev->dev, sizeof *tspi);
- if (master == NULL) {
- dev_err(&pdev->dev, "master allocation failed\n");
- return -ENOMEM;
- }
-
- /* the spi->mode bits understood by this driver: */
- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
-
- master->bus_num = pdev->id;
-
- master->setup = spi_tegra_setup;
- master->transfer = spi_tegra_transfer;
- master->num_chipselect = 4;
-
- dev_set_drvdata(&pdev->dev, master);
- tspi = spi_master_get_devdata(master);
- tspi->master = master;
- tspi->pdev = pdev;
- spin_lock_init(&tspi->lock);
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (r == NULL) {
- ret = -ENODEV;
- goto err0;
- }
-
- if (!request_mem_region(r->start, resource_size(r),
- dev_name(&pdev->dev))) {
- ret = -EBUSY;
- goto err0;
- }
-
- tspi->phys = r->start;
- tspi->base = ioremap(r->start, resource_size(r));
- if (!tspi->base) {
- dev_err(&pdev->dev, "can't ioremap iomem\n");
- ret = -ENOMEM;
- goto err1;
- }
-
- tspi->clk = clk_get(&pdev->dev, NULL);
- if (IS_ERR(tspi->clk)) {
- dev_err(&pdev->dev, "can not get clock\n");
- ret = PTR_ERR(tspi->clk);
- goto err2;
- }
-
- INIT_LIST_HEAD(&tspi->queue);
-
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
- tspi->rx_dma = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
- if (!tspi->rx_dma) {
- dev_err(&pdev->dev, "can not allocate rx dma channel\n");
- ret = -ENODEV;
- goto err3;
- }
-#else
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- tspi->rx_dma = dma_request_channel(mask, NULL, NULL);
- if (!tspi->rx_dma) {
- dev_err(&pdev->dev, "can not allocate rx dma channel\n");
- ret = -ENODEV;
- goto err3;
- }
-
-#endif
-
- tspi->rx_bb = dma_alloc_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
- &tspi->rx_bb_phys, GFP_KERNEL);
- if (!tspi->rx_bb) {
- dev_err(&pdev->dev, "can not allocate rx bounce buffer\n");
- ret = -ENOMEM;
- goto err4;
- }
-
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
- tspi->rx_dma_req.complete = tegra_spi_rx_dma_complete;
- tspi->rx_dma_req.to_memory = 1;
- tspi->rx_dma_req.dest_addr = tspi->rx_bb_phys;
- tspi->rx_dma_req.dest_bus_width = 32;
- tspi->rx_dma_req.source_addr = tspi->phys + SLINK_RX_FIFO;
- tspi->rx_dma_req.source_bus_width = 32;
- tspi->rx_dma_req.source_wrap = 4;
- tspi->rx_dma_req.req_sel = spi_tegra_req_sels[pdev->id];
- tspi->rx_dma_req.dev = tspi;
-#else
- /* Dmaengine Dma slave config */
- tspi->sconfig.src_addr = tspi->phys + SLINK_RX_FIFO;
- tspi->sconfig.dst_addr = tspi->phys + SLINK_RX_FIFO;
- tspi->sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
- tspi->sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
- tspi->sconfig.slave_id = spi_tegra_req_sels[pdev->id];
- tspi->sconfig.src_maxburst = 1;
- tspi->sconfig.dst_maxburst = 1;
- ret = dmaengine_device_control(tspi->rx_dma,
- DMA_SLAVE_CONFIG, (unsigned long) &tspi->sconfig);
- if (ret < 0) {
- dev_err(&pdev->dev, "can not do slave configure for dma %d\n",
- ret);
- goto err4;
- }
-#endif
-
- master->dev.of_node = pdev->dev.of_node;
- ret = spi_register_master(master);
-
- if (ret < 0)
- goto err5;
-
- return ret;
-
-err5:
- dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
- tspi->rx_bb, tspi->rx_bb_phys);
-err4:
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
- tegra_dma_free_channel(tspi->rx_dma);
-#else
- dma_release_channel(tspi->rx_dma);
-#endif
-err3:
- clk_put(tspi->clk);
-err2:
- iounmap(tspi->base);
-err1:
- release_mem_region(r->start, resource_size(r));
-err0:
- spi_master_put(master);
- return ret;
-}
-
-static int __devexit spi_tegra_remove(struct platform_device *pdev)
-{
- struct spi_master *master;
- struct spi_tegra_data *tspi;
- struct resource *r;
-
- master = spi_master_get(dev_get_drvdata(&pdev->dev));
- tspi = spi_master_get_devdata(master);
-
- spi_unregister_master(master);
-#if defined(CONFIG_TEGRA_SYSTEM_DMA)
- tegra_dma_free_channel(tspi->rx_dma);
-#else
- dma_release_channel(tspi->rx_dma);
-#endif
-
- dma_free_coherent(&pdev->dev, sizeof(u32) * BB_LEN,
- tspi->rx_bb, tspi->rx_bb_phys);
-
- clk_put(tspi->clk);
- iounmap(tspi->base);
-
- spi_master_put(master);
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(r->start, resource_size(r));
-
- return 0;
-}
-
-MODULE_ALIAS("platform:spi_tegra");
-
-#ifdef CONFIG_OF
-static struct of_device_id spi_tegra_of_match_table[] __devinitdata = {
- { .compatible = "nvidia,tegra20-spi", },
- {}
-};
-MODULE_DEVICE_TABLE(of, spi_tegra_of_match_table);
-#else /* CONFIG_OF */
-#define spi_tegra_of_match_table NULL
-#endif /* CONFIG_OF */
-
-static struct platform_driver spi_tegra_driver = {
- .driver = {
- .name = "spi_tegra",
- .owner = THIS_MODULE,
- .of_match_table = spi_tegra_of_match_table,
- },
- .probe = spi_tegra_probe,
- .remove = __devexit_p(spi_tegra_remove),
-};
-module_platform_driver(spi_tegra_driver);
-
-MODULE_LICENSE("GPL");
--
1.7.0.4
--
To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
