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Merge remote-tracking branches 'spi/topic/sh', 'spi/topic/sh-msiof' and 'spi/topic/topcliff-pch' into spi-next

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This commit is contained in:
Mark Brown 2014-08-04 17:21:16 +01:00
commit fab6a0410d
5 changed files with 494 additions and 64 deletions
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2
drivers/spi/Kconfig
View File

@ -446,7 +446,7 @@ config SPI_SC18IS602
config SPI_SH_MSIOF
tristate "SuperH MSIOF SPI controller"
depends on HAVE_CLK
depends on HAVE_CLK && HAS_DMA
depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
help
SPI driver for SuperH and SH Mobile MSIOF blocks.

527
drivers/spi/spi-sh-msiof.c
View File

@ -2,6 +2,7 @@
* SuperH MSIOF SPI Master Interface
*
* Copyright (c) 2009 Magnus Damm
* Copyright (C) 2014 Glider bvba
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -13,6 +14,8 @@
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
@ -23,6 +26,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/sh_dma.h>
#include <linux/spi/sh_msiof.h>
#include <linux/spi/spi.h>
@ -37,6 +41,7 @@ struct sh_msiof_chipdata {
};
struct sh_msiof_spi_priv {
struct spi_master *master;
void __iomem *mapbase;
struct clk *clk;
struct platform_device *pdev;
@ -45,6 +50,10 @@ struct sh_msiof_spi_priv {
struct completion done;
int tx_fifo_size;
int rx_fifo_size;
void *tx_dma_page;
void *rx_dma_page;
dma_addr_t tx_dma_addr;
dma_addr_t rx_dma_addr;
};
#define TMDR1 0x00 /* Transmit Mode Register 1 */
@ -84,6 +93,8 @@ struct sh_msiof_spi_priv {
#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
#define MAX_WDLEN 256U
/* TSCR and RSCR */
#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
#define SCR_BRPS(i) (((i) - 1) << 8)
@ -113,9 +124,61 @@ struct sh_msiof_spi_priv {
#define CTR_TXE 0x00000200 /* Transmit Enable */
#define CTR_RXE 0x00000100 /* Receive Enable */
/* STR and IER */
/* FCTR */
#define FCTR_TFWM_MASK 0xe0000000 /* Transmit FIFO Watermark */
#define FCTR_TFWM_64 0x00000000 /* Transfer Request when 64 empty stages */
#define FCTR_TFWM_32 0x20000000 /* Transfer Request when 32 empty stages */
#define FCTR_TFWM_24 0x40000000 /* Transfer Request when 24 empty stages */
#define FCTR_TFWM_16 0x60000000 /* Transfer Request when 16 empty stages */
#define FCTR_TFWM_12 0x80000000 /* Transfer Request when 12 empty stages */
#define FCTR_TFWM_8 0xa0000000 /* Transfer Request when 8 empty stages */
#define FCTR_TFWM_4 0xc0000000 /* Transfer Request when 4 empty stages */
#define FCTR_TFWM_1 0xe0000000 /* Transfer Request when 1 empty stage */
#define FCTR_TFUA_MASK 0x07f00000 /* Transmit FIFO Usable Area */
#define FCTR_TFUA_SHIFT 20
#define FCTR_TFUA(i) ((i) << FCTR_TFUA_SHIFT)
#define FCTR_RFWM_MASK 0x0000e000 /* Receive FIFO Watermark */
#define FCTR_RFWM_1 0x00000000 /* Transfer Request when 1 valid stages */
#define FCTR_RFWM_4 0x00002000 /* Transfer Request when 4 valid stages */
#define FCTR_RFWM_8 0x00004000 /* Transfer Request when 8 valid stages */
#define FCTR_RFWM_16 0x00006000 /* Transfer Request when 16 valid stages */
#define FCTR_RFWM_32 0x00008000 /* Transfer Request when 32 valid stages */
#define FCTR_RFWM_64 0x0000a000 /* Transfer Request when 64 valid stages */
#define FCTR_RFWM_128 0x0000c000 /* Transfer Request when 128 valid stages */
#define FCTR_RFWM_256 0x0000e000 /* Transfer Request when 256 valid stages */
#define FCTR_RFUA_MASK 0x00001ff0 /* Receive FIFO Usable Area (0x40 = full) */
#define FCTR_RFUA_SHIFT 4
#define FCTR_RFUA(i) ((i) << FCTR_RFUA_SHIFT)
/* STR */
#define STR_TFEMP 0x20000000 /* Transmit FIFO Empty */
#define STR_TDREQ 0x10000000 /* Transmit Data Transfer Request */
#define STR_TEOF 0x00800000 /* Frame Transmission End */
#define STR_TFSERR 0x00200000 /* Transmit Frame Synchronization Error */
#define STR_TFOVF 0x00100000 /* Transmit FIFO Overflow */
#define STR_TFUDF 0x00080000 /* Transmit FIFO Underflow */
#define STR_RFFUL 0x00002000 /* Receive FIFO Full */
#define STR_RDREQ 0x00001000 /* Receive Data Transfer Request */
#define STR_REOF 0x00000080 /* Frame Reception End */
#define STR_RFSERR 0x00000020 /* Receive Frame Synchronization Error */
#define STR_RFUDF 0x00000010 /* Receive FIFO Underflow */
#define STR_RFOVF 0x00000008 /* Receive FIFO Overflow */
/* IER */
#define IER_TDMAE 0x80000000 /* Transmit Data DMA Transfer Req. Enable */
#define IER_TFEMPE 0x20000000 /* Transmit FIFO Empty Enable */
#define IER_TDREQE 0x10000000 /* Transmit Data Transfer Request Enable */
#define IER_TEOFE 0x00800000 /* Frame Transmission End Enable */
#define IER_TFSERRE 0x00200000 /* Transmit Frame Sync Error Enable */
#define IER_TFOVFE 0x00100000 /* Transmit FIFO Overflow Enable */
#define IER_TFUDFE 0x00080000 /* Transmit FIFO Underflow Enable */
#define IER_RDMAE 0x00008000 /* Receive Data DMA Transfer Req. Enable */
#define IER_RFFULE 0x00002000 /* Receive FIFO Full Enable */
#define IER_RDREQE 0x00001000 /* Receive Data Transfer Request Enable */
#define IER_REOFE 0x00000080 /* Frame Reception End Enable */
#define IER_RFSERRE 0x00000020 /* Receive Frame Sync Error Enable */
#define IER_RFUDFE 0x00000010 /* Receive FIFO Underflow Enable */
#define IER_RFOVFE 0x00000008 /* Receive FIFO Overflow Enable */
static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
@ -230,8 +293,6 @@ static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
* 1 0 11 11 0 0
* 1 1 11 11 1 1
*/
sh_msiof_write(p, FCTR, 0);
tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
tmp |= lsb_first << MDR1_BITLSB_SHIFT;
@ -267,8 +328,6 @@ static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
if (rx_buf)
sh_msiof_write(p, RMDR2, dr2);
sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
}
static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
@ -457,6 +516,40 @@ static int sh_msiof_prepare_message(struct spi_master *master,
return 0;
}
static int sh_msiof_spi_start(struct sh_msiof_spi_priv *p, void *rx_buf)
{
int ret;
/* setup clock and rx/tx signals */
ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
if (rx_buf && !ret)
ret = sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
if (!ret)
ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
/* start by setting frame bit */
if (!ret)
ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
return ret;
}
static int sh_msiof_spi_stop(struct sh_msiof_spi_priv *p, void *rx_buf)
{
int ret;
/* shut down frame, rx/tx and clock signals */
ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
if (!ret)
ret = sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
if (rx_buf && !ret)
ret = sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
if (!ret)
ret = sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
return ret;
}
static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
void (*tx_fifo)(struct sh_msiof_spi_priv *,
const void *, int, int),
@ -477,29 +570,32 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
/* the fifo contents need shifting */
fifo_shift = 32 - bits;
/* default FIFO watermarks for PIO */
sh_msiof_write(p, FCTR, 0);
/* setup msiof transfer mode registers */
sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
sh_msiof_write(p, IER, IER_TEOFE | IER_REOFE);
/* write tx fifo */
if (tx_buf)
tx_fifo(p, tx_buf, words, fifo_shift);
/* setup clock and rx/tx signals */
ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
if (rx_buf)
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
/* start by setting frame bit */
reinit_completion(&p->done);
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
ret = sh_msiof_spi_start(p, rx_buf);
if (ret) {
dev_err(&p->pdev->dev, "failed to start hardware\n");
goto err;
goto stop_ier;
}
/* wait for tx fifo to be emptied / rx fifo to be filled */
wait_for_completion(&p->done);
ret = wait_for_completion_timeout(&p->done, HZ);
if (!ret) {
dev_err(&p->pdev->dev, "PIO timeout\n");
ret = -ETIMEDOUT;
goto stop_reset;
}
/* read rx fifo */
if (rx_buf)
@ -508,41 +604,248 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
/* clear status bits */
sh_msiof_reset_str(p);
/* shut down frame, rx/tx and clock signals */
ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
if (rx_buf)
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
ret = sh_msiof_spi_stop(p, rx_buf);
if (ret) {
dev_err(&p->pdev->dev, "failed to shut down hardware\n");
goto err;
return ret;
}
return words;
err:
stop_reset:
sh_msiof_reset_str(p);
sh_msiof_spi_stop(p, rx_buf);
stop_ier:
sh_msiof_write(p, IER, 0);
return ret;
}
static void sh_msiof_dma_complete(void *arg)
{
struct sh_msiof_spi_priv *p = arg;
sh_msiof_write(p, IER, 0);
complete(&p->done);
}
static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
void *rx, unsigned int len)
{
u32 ier_bits = 0;
struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
dma_cookie_t cookie;
int ret;
if (tx) {
ier_bits |= IER_TDREQE | IER_TDMAE;
dma_sync_single_for_device(p->master->dma_tx->device->dev,
p->tx_dma_addr, len, DMA_TO_DEVICE);
desc_tx = dmaengine_prep_slave_single(p->master->dma_tx,
p->tx_dma_addr, len, DMA_TO_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx)
return -EAGAIN;
}
if (rx) {
ier_bits |= IER_RDREQE | IER_RDMAE;
desc_rx = dmaengine_prep_slave_single(p->master->dma_rx,
p->rx_dma_addr, len, DMA_FROM_DEVICE,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_rx)
return -EAGAIN;
}
/* 1 stage FIFO watermarks for DMA */
sh_msiof_write(p, FCTR, FCTR_TFWM_1 | FCTR_RFWM_1);
/* setup msiof transfer mode registers (32-bit words) */
sh_msiof_spi_set_mode_regs(p, tx, rx, 32, len / 4);
sh_msiof_write(p, IER, ier_bits);
reinit_completion(&p->done);
if (rx) {
desc_rx->callback = sh_msiof_dma_complete;
desc_rx->callback_param = p;
cookie = dmaengine_submit(desc_rx);
if (dma_submit_error(cookie)) {
ret = cookie;
goto stop_ier;
}
dma_async_issue_pending(p->master->dma_rx);
}
if (tx) {
if (rx) {
/* No callback */
desc_tx->callback = NULL;
} else {
desc_tx->callback = sh_msiof_dma_complete;
desc_tx->callback_param = p;
}
cookie = dmaengine_submit(desc_tx);
if (dma_submit_error(cookie)) {
ret = cookie;
goto stop_rx;
}
dma_async_issue_pending(p->master->dma_tx);
}
ret = sh_msiof_spi_start(p, rx);
if (ret) {
dev_err(&p->pdev->dev, "failed to start hardware\n");
goto stop_tx;
}
/* wait for tx fifo to be emptied / rx fifo to be filled */
ret = wait_for_completion_timeout(&p->done, HZ);
if (!ret) {
dev_err(&p->pdev->dev, "DMA timeout\n");
ret = -ETIMEDOUT;
goto stop_reset;
}
/* clear status bits */
sh_msiof_reset_str(p);
ret = sh_msiof_spi_stop(p, rx);
if (ret) {
dev_err(&p->pdev->dev, "failed to shut down hardware\n");
return ret;
}
if (rx)
dma_sync_single_for_cpu(p->master->dma_rx->device->dev,
p->rx_dma_addr, len,
DMA_FROM_DEVICE);
return 0;
stop_reset:
sh_msiof_reset_str(p);
sh_msiof_spi_stop(p, rx);
stop_tx:
if (tx)
dmaengine_terminate_all(p->master->dma_tx);
stop_rx:
if (rx)
dmaengine_terminate_all(p->master->dma_rx);
stop_ier:
sh_msiof_write(p, IER, 0);
return ret;
}
static void copy_bswap32(u32 *dst, const u32 *src, unsigned int words)
{
/* src or dst can be unaligned, but not both */
if ((unsigned long)src & 3) {
while (words--) {
*dst++ = swab32(get_unaligned(src));
src++;
}
} else if ((unsigned long)dst & 3) {
while (words--) {
put_unaligned(swab32(*src++), dst);
dst++;
}
} else {
while (words--)
*dst++ = swab32(*src++);
}
}
static void copy_wswap32(u32 *dst, const u32 *src, unsigned int words)
{
/* src or dst can be unaligned, but not both */
if ((unsigned long)src & 3) {
while (words--) {
*dst++ = swahw32(get_unaligned(src));
src++;
}
} else if ((unsigned long)dst & 3) {
while (words--) {
put_unaligned(swahw32(*src++), dst);
dst++;
}
} else {
while (words--)
*dst++ = swahw32(*src++);
}
}
static void copy_plain32(u32 *dst, const u32 *src, unsigned int words)
{
memcpy(dst, src, words * 4);
}
static int sh_msiof_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *t)
{
struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
void (*copy32)(u32 *, const u32 *, unsigned int);
void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
int bits;
int bytes_per_word;
int bytes_done;
int words;
const void *tx_buf = t->tx_buf;
void *rx_buf = t->rx_buf;
unsigned int len = t->len;
unsigned int bits = t->bits_per_word;
unsigned int bytes_per_word;
unsigned int words;
int n;
bool swab;
int ret;
bits = t->bits_per_word;
/* setup clocks (clock already enabled in chipselect()) */
sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
while (master->dma_tx && len > 15) {
/*
* DMA supports 32-bit words only, hence pack 8-bit and 16-bit
* words, with byte resp. word swapping.
*/
unsigned int l = min(len, MAX_WDLEN * 4);
if (bits <= 8) {
if (l & 3)
break;
copy32 = copy_bswap32;
} else if (bits <= 16) {
if (l & 1)
break;
copy32 = copy_wswap32;
} else {
copy32 = copy_plain32;
}
if (tx_buf)
copy32(p->tx_dma_page, tx_buf, l / 4);
ret = sh_msiof_dma_once(p, tx_buf, rx_buf, l);
if (ret == -EAGAIN) {
pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
dev_driver_string(&p->pdev->dev),
dev_name(&p->pdev->dev));
break;
}
if (ret)
return ret;
if (rx_buf) {
copy32(rx_buf, p->rx_dma_page, l / 4);
rx_buf += l;
}
if (tx_buf)
tx_buf += l;
len -= l;
if (!len)
return 0;
}
if (bits <= 8 && len > 15 && !(len & 3)) {
bits = 32;
swab = true;
} else {
@ -556,57 +859,52 @@ static int sh_msiof_transfer_one(struct spi_master *master,
rx_fifo = sh_msiof_spi_read_fifo_8;
} else if (bits <= 16) {
bytes_per_word = 2;
if ((unsigned long)t->tx_buf & 0x01)
if ((unsigned long)tx_buf & 0x01)
tx_fifo = sh_msiof_spi_write_fifo_16u;
else
tx_fifo = sh_msiof_spi_write_fifo_16;
if ((unsigned long)t->rx_buf & 0x01)
if ((unsigned long)rx_buf & 0x01)
rx_fifo = sh_msiof_spi_read_fifo_16u;
else
rx_fifo = sh_msiof_spi_read_fifo_16;
} else if (swab) {
bytes_per_word = 4;
if ((unsigned long)t->tx_buf & 0x03)
if ((unsigned long)tx_buf & 0x03)
tx_fifo = sh_msiof_spi_write_fifo_s32u;
else
tx_fifo = sh_msiof_spi_write_fifo_s32;
if ((unsigned long)t->rx_buf & 0x03)
if ((unsigned long)rx_buf & 0x03)
rx_fifo = sh_msiof_spi_read_fifo_s32u;
else
rx_fifo = sh_msiof_spi_read_fifo_s32;
} else {
bytes_per_word = 4;
if ((unsigned long)t->tx_buf & 0x03)
if ((unsigned long)tx_buf & 0x03)
tx_fifo = sh_msiof_spi_write_fifo_32u;
else
tx_fifo = sh_msiof_spi_write_fifo_32;
if ((unsigned long)t->rx_buf & 0x03)
if ((unsigned long)rx_buf & 0x03)
rx_fifo = sh_msiof_spi_read_fifo_32u;
else
rx_fifo = sh_msiof_spi_read_fifo_32;
}
/* setup clocks (clock already enabled in chipselect()) */
sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
/* transfer in fifo sized chunks */
words = t->len / bytes_per_word;
bytes_done = 0;
words = len / bytes_per_word;
while (bytes_done < t->len) {
void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
tx_buf,
rx_buf,
while (words > 0) {
n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo, tx_buf, rx_buf,
words, bits);
if (n < 0)
break;
return n;
bytes_done += n * bytes_per_word;
if (tx_buf)
tx_buf += n * bytes_per_word;
if (rx_buf)
rx_buf += n * bytes_per_word;
words -= n;
}
@ -663,6 +961,128 @@ static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
}
#endif
static struct dma_chan *sh_msiof_request_dma_chan(struct device *dev,
enum dma_transfer_direction dir, unsigned int id, dma_addr_t port_addr)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
struct dma_slave_config cfg;
int ret;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
chan = dma_request_channel(mask, shdma_chan_filter,
(void *)(unsigned long)id);
if (!chan) {
dev_warn(dev, "dma_request_channel failed\n");
return NULL;
}
memset(&cfg, 0, sizeof(cfg));
cfg.slave_id = id;
cfg.direction = dir;
if (dir == DMA_MEM_TO_DEV)
cfg.dst_addr = port_addr;
else
cfg.src_addr = port_addr;
ret = dmaengine_slave_config(chan, &cfg);
if (ret) {
dev_warn(dev, "dmaengine_slave_config failed %d\n", ret);
dma_release_channel(chan);
return NULL;
}
return chan;
}
static int sh_msiof_request_dma(struct sh_msiof_spi_priv *p)
{
struct platform_device *pdev = p->pdev;
struct device *dev = &pdev->dev;
const struct sh_msiof_spi_info *info = dev_get_platdata(dev);
const struct resource *res;
struct spi_master *master;
struct device *tx_dev, *rx_dev;
if (!info || !info->dma_tx_id || !info->dma_rx_id)
return 0; /* The driver assumes no error */
/* The DMA engine uses the second register set, if present */
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
master = p->master;
master->dma_tx = sh_msiof_request_dma_chan(dev, DMA_MEM_TO_DEV,
info->dma_tx_id,
res->start + TFDR);
if (!master->dma_tx)
return -ENODEV;
master->dma_rx = sh_msiof_request_dma_chan(dev, DMA_DEV_TO_MEM,
info->dma_rx_id,
res->start + RFDR);
if (!master->dma_rx)
goto free_tx_chan;
p->tx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
if (!p->tx_dma_page)
goto free_rx_chan;
p->rx_dma_page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
if (!p->rx_dma_page)
goto free_tx_page;
tx_dev = master->dma_tx->device->dev;
p->tx_dma_addr = dma_map_single(tx_dev, p->tx_dma_page, PAGE_SIZE,
DMA_TO_DEVICE);
if (dma_mapping_error(tx_dev, p->tx_dma_addr))
goto free_rx_page;
rx_dev = master->dma_rx->device->dev;
p->rx_dma_addr = dma_map_single(rx_dev, p->rx_dma_page, PAGE_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(rx_dev, p->rx_dma_addr))
goto unmap_tx_page;
dev_info(dev, "DMA available");
return 0;
unmap_tx_page:
dma_unmap_single(tx_dev, p->tx_dma_addr, PAGE_SIZE, DMA_TO_DEVICE);
free_rx_page:
free_page((unsigned long)p->rx_dma_page);
free_tx_page:
free_page((unsigned long)p->tx_dma_page);
free_rx_chan:
dma_release_channel(master->dma_rx);
free_tx_chan:
dma_release_channel(master->dma_tx);
master->dma_tx = NULL;
return -ENODEV;
}
static void sh_msiof_release_dma(struct sh_msiof_spi_priv *p)
{
struct spi_master *master = p->master;
struct device *dev;
if (!master->dma_tx)
return;
dev = &p->pdev->dev;
dma_unmap_single(master->dma_rx->device->dev, p->rx_dma_addr,
PAGE_SIZE, DMA_FROM_DEVICE);
dma_unmap_single(master->dma_tx->device->dev, p->tx_dma_addr,
PAGE_SIZE, DMA_TO_DEVICE);
free_page((unsigned long)p->rx_dma_page);
free_page((unsigned long)p->tx_dma_page);
dma_release_channel(master->dma_rx);
dma_release_channel(master->dma_tx);
}
static int sh_msiof_spi_probe(struct platform_device *pdev)
{
struct resource *r;
@ -680,6 +1100,9 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
p = spi_master_get_devdata(master);
platform_set_drvdata(pdev, p);
p->master = master;
of_id = of_match_device(sh_msiof_match, &pdev->dev);
if (of_id) {
p->chipdata = of_id->data;
@ -749,6 +1172,10 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
master->auto_runtime_pm = true;
master->transfer_one = sh_msiof_transfer_one;
ret = sh_msiof_request_dma(p);
if (ret < 0)
dev_warn(&pdev->dev, "DMA not available, using PIO\n");
ret = devm_spi_register_master(&pdev->dev, master);
if (ret < 0) {
dev_err(&pdev->dev, "spi_register_master error.\n");
@ -758,6 +1185,7 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
return 0;
err2:
sh_msiof_release_dma(p);
pm_runtime_disable(&pdev->dev);
err1:
spi_master_put(master);
@ -766,6 +1194,9 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
static int sh_msiof_spi_remove(struct platform_device *pdev)
{
struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
sh_msiof_release_dma(p);
pm_runtime_disable(&pdev->dev);
return 0;
}

15
drivers/spi/spi-sh.c
View File

@ -432,7 +432,6 @@ static int spi_sh_remove(struct platform_device *pdev)
spi_unregister_master(ss->master);
destroy_workqueue(ss->workqueue);
free_irq(ss->irq, ss);
iounmap(ss->addr);
return 0;
}
@ -480,7 +479,7 @@ static int spi_sh_probe(struct platform_device *pdev)
}
ss->irq = irq;
ss->master = master;
ss->addr = ioremap(res->start, resource_size(res));
ss->addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (ss->addr == NULL) {
dev_err(&pdev->dev, "ioremap error.\n");
ret = -ENOMEM;
@ -495,13 +494,13 @@ static int spi_sh_probe(struct platform_device *pdev)
if (ss->workqueue == NULL) {
dev_err(&pdev->dev, "create workqueue error\n");
ret = -EBUSY;
goto error2;
goto error1;
}
ret = request_irq(irq, spi_sh_irq, 0, "spi_sh", ss);
if (ret < 0) {
dev_err(&pdev->dev, "request_irq error\n");
goto error3;
goto error2;
}
master->num_chipselect = 2;
@ -513,17 +512,15 @@ static int spi_sh_probe(struct platform_device *pdev)
ret = spi_register_master(master);
if (ret < 0) {
printk(KERN_ERR "spi_register_master error.\n");
goto error4;
goto error3;
}
return 0;
error4:
free_irq(irq, ss);
error3:
destroy_workqueue(ss->workqueue);
free_irq(irq, ss);
error2:
iounmap(ss->addr);
destroy_workqueue(ss->workqueue);
error1:
spi_master_put(master);

12
drivers/spi/spi-topcliff-pch.c
View File

@ -874,8 +874,8 @@ static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
dma_cap_set(DMA_SLAVE, mask);
/* Get DMA's dev information */
dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
PCI_DEVFN(12, 0));
dma_dev = pci_get_slot(data->board_dat->pdev->bus,
PCI_DEVFN(PCI_SLOT(data->board_dat->pdev->devfn), 0));
/* Set Tx DMA */
param = &dma->param_tx;
@ -1047,8 +1047,8 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
num, DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_rx) {
dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
__func__);
dev_err(&data->master->dev,
"%s:dmaengine_prep_slave_sg Failed\n", __func__);
return;
}
dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE);
@ -1106,8 +1106,8 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
sg, num, DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc_tx) {
dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
__func__);
dev_err(&data->master->dev,
"%s:dmaengine_prep_slave_sg Failed\n", __func__);
return;
}
dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE);

2
include/linux/spi/sh_msiof.h
View File

@ -5,6 +5,8 @@ struct sh_msiof_spi_info {
int tx_fifo_override;
int rx_fifo_override;
u16 num_chipselect;
unsigned int dma_tx_id;
unsigned int dma_rx_id;
};
#endif /* __SPI_SH_MSIOF_H__ */