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spi: move more spi_setup() functionality into core 

Move some common spi_setup() error checks into the SPI framework from the
spi_master controller drivers:

 - Add a new "mode_bits" field to spi_master

 - Use that in spi_setup to validate the spi->mode value being
   requested.  Setting this new field is now mandatory for any
   controller supporting more than vanilla SPI_MODE_0.

 - Update all spi_master drivers to:

     * Initialize that field
     * Remove current spi_setup() checks using that value.

This is a net minor code shrink.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Brownell 2009-06-17 16:26:04 -07:00 committed by Linus Torvalds
parent 7d0771970c
commit e7db06b5d5
16 changed files with 57 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/spi/atmel_spi.c
View File

@ -530,9 +530,6 @@ atmel_spi_interrupt(int irq, void *dev_id)
return ret;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int atmel_spi_setup(struct spi_device *spi)
{
struct atmel_spi *as;
@ -562,12 +559,6 @@ static int atmel_spi_setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
/* see notes above re chipselect */
if (!atmel_spi_is_v2()
&& spi->chip_select == 0
@ -773,6 +764,9 @@ static int __init atmel_spi_probe(struct platform_device *pdev)
if (!master)
goto out_free;
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->bus_num = pdev->id;
master->num_chipselect = 4;
master->setup = atmel_spi_setup;

12
drivers/spi/au1550_spi.c
View File

@ -284,9 +284,6 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST)
static int au1550_spi_setup(struct spi_device *spi)
{
struct au1550_spi *hw = spi_master_get_devdata(spi->master);
@ -297,12 +294,6 @@ static int au1550_spi_setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (spi->max_speed_hz == 0)
spi->max_speed_hz = hw->freq_max;
if (spi->max_speed_hz > hw->freq_max
@ -779,6 +770,9 @@ static int __init au1550_spi_probe(struct platform_device *pdev)
goto err_nomem;
}
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
hw = spi_master_get_devdata(master);
hw->master = spi_master_get(master);

12
drivers/spi/mpc52xx_psc_spi.c
View File

@ -261,9 +261,6 @@ static void mpc52xx_psc_spi_work(struct work_struct *work)
spin_unlock_irq(&mps->lock);
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST)
static int mpc52xx_psc_spi_setup(struct spi_device *spi)
{
struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
@ -273,12 +270,6 @@ static int mpc52xx_psc_spi_setup(struct spi_device *spi)
if (spi->bits_per_word%8)
return -EINVAL;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (!cs) {
cs = kzalloc(sizeof *cs, GFP_KERNEL);
if (!cs)
@ -385,6 +376,9 @@ static int __init mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr,
dev_set_drvdata(dev, master);
mps = spi_master_get_devdata(master);
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
mps->irq = irq;
if (pdata == NULL) {
dev_warn(dev, "probe called without platform data, no "

12
drivers/spi/omap2_mcspi.c
View File

@ -603,9 +603,6 @@ static int omap2_mcspi_request_dma(struct spi_device *spi)
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int omap2_mcspi_setup(struct spi_device *spi)
{
int ret;
@ -613,12 +610,6 @@ static int omap2_mcspi_setup(struct spi_device *spi)
struct omap2_mcspi_dma *mcspi_dma;
struct omap2_mcspi_cs *cs = spi->controller_state;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
spi->bits_per_word);
@ -982,6 +973,9 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev)
return -ENOMEM;
}
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
if (pdev->id != -1)
master->bus_num = pdev->id;

12
drivers/spi/omap_uwire.c
View File

@ -447,19 +447,10 @@ done:
return status;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int uwire_setup(struct spi_device *spi)
{
struct uwire_state *ust = spi->controller_state;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (ust == NULL) {
ust = kzalloc(sizeof(*ust), GFP_KERNEL);
if (ust == NULL)
@ -520,6 +511,9 @@ static int __init uwire_probe(struct platform_device *pdev)
uwire_write_reg(UWIRE_SR3, 1);
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->bus_num = 2; /* "official" */
master->num_chipselect = 4;
master->setup = uwire_setup;

9
drivers/spi/orion_spi.c
View File

@ -358,12 +358,6 @@ static int orion_spi_setup(struct spi_device *spi)
orion_spi = spi_master_get_devdata(spi->master);
if (spi->mode) {
dev_err(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode);
return -EINVAL;
}
/* Fix ac timing if required. */
if (orion_spi->spi_info->enable_clock_fix)
orion_spi_setbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
@ -473,6 +467,9 @@ static int __init orion_spi_probe(struct platform_device *pdev)
if (pdev->id != -1)
master->bus_num = pdev->id;
/* we support only mode 0, and no options */
master->mode_bits = 0;
master->setup = orion_spi_setup;
master->transfer = orion_spi_transfer;
master->num_chipselect = ORION_NUM_CHIPSELECTS;

12
drivers/spi/pxa2xx_spi.c
View File

@ -1185,9 +1185,6 @@ static int transfer(struct spi_device *spi, struct spi_message *msg)
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA)
static int setup_cs(struct spi_device *spi, struct chip_data *chip,
struct pxa2xx_spi_chip *chip_info)
{
@ -1252,12 +1249,6 @@ static int setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
/* Only alloc on first setup */
chip = spi_get_ctldata(spi);
if (!chip) {
@ -1493,6 +1484,9 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
drv_data->pdev = pdev;
drv_data->ssp = ssp;
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA;
master->bus_num = pdev->id;
master->num_chipselect = platform_info->num_chipselect;
master->dma_alignment = DMA_ALIGNMENT;

11
drivers/spi/spi.c
View File

@ -607,8 +607,19 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master);
*/
int spi_setup(struct spi_device *spi)
{
unsigned bad_bits;
int status;
/* help drivers fail *cleanly* when they need options
* that aren't supported with their current master
*/
bad_bits = spi->mode & ~spi->master->mode_bits;
if (bad_bits) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
bad_bits);
return -EINVAL;
}
if (!spi->bits_per_word)
spi->bits_per_word = 8;

9
drivers/spi/spi_bfin5xx.c
View File

@ -1010,12 +1010,6 @@ static int bfin_spi_setup(struct spi_device *spi)
struct driver_data *drv_data = spi_master_get_devdata(spi->master);
int ret;
/* Abort device setup if requested features are not supported */
if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) {
dev_err(&spi->dev, "requested mode not fully supported\n");
return -EINVAL;
}
if (spi->bits_per_word != 8 && spi->bits_per_word != 16)
return -EINVAL;
@ -1283,6 +1277,9 @@ static int __init bfin_spi_probe(struct platform_device *pdev)
drv_data->pdev = pdev;
drv_data->pin_req = platform_info->pin_req;
/* the spi->mode bits supported by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
master->bus_num = pdev->id;
master->num_chipselect = platform_info->num_chipselect;
master->cleanup = bfin_spi_cleanup;

9
drivers/spi/spi_bitbang.c
View File

@ -188,12 +188,6 @@ int spi_bitbang_setup(struct spi_device *spi)
bitbang = spi_master_get_devdata(spi->master);
/* Bitbangers can support SPI_CS_HIGH, SPI_3WIRE, and so on;
* add those to master->flags, and provide the other support.
*/
if ((spi->mode & ~(SPI_CPOL|SPI_CPHA|bitbang->flags)) != 0)
return -EINVAL;
if (!cs) {
cs = kzalloc(sizeof *cs, GFP_KERNEL);
if (!cs)
@ -452,6 +446,9 @@ int spi_bitbang_start(struct spi_bitbang *bitbang)
spin_lock_init(&bitbang->lock);
INIT_LIST_HEAD(&bitbang->queue);
if (!bitbang->master->mode_bits)
bitbang->master->mode_bits = SPI_CPOL | SPI_CPHA | bitbang->flags;
if (!bitbang->master->transfer)
bitbang->master->transfer = spi_bitbang_transfer;
if (!bitbang->txrx_bufs) {

12
drivers/spi/spi_imx.c
View File

@ -1171,9 +1171,6 @@ msg_rejected:
return -EINVAL;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
/* On first setup bad values must free chip_data memory since will cause
spi_new_device to fail. Bad value setup from protocol driver are simply not
applied and notified to the calling driver. */
@ -1186,12 +1183,6 @@ static int setup(struct spi_device *spi)
u32 tmp;
int status = 0;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
/* Get controller data */
chip_info = spi->controller_data;
@ -1478,6 +1469,9 @@ static int __init spi_imx_probe(struct platform_device *pdev)
drv_data->master_info = platform_info;
drv_data->pdev = pdev;
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->bus_num = pdev->id;
master->num_chipselect = platform_info->num_chipselect;
master->dma_alignment = DMA_ALIGNMENT;

14
drivers/spi/spi_mpc83xx.c
View File

@ -419,10 +419,6 @@ static void mpc83xx_spi_work(struct work_struct *work)
spin_unlock_irq(&mpc83xx_spi->lock);
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
| SPI_LSB_FIRST | SPI_LOOP)
static int mpc83xx_spi_setup(struct spi_device *spi)
{
struct mpc83xx_spi *mpc83xx_spi;
@ -430,12 +426,6 @@ static int mpc83xx_spi_setup(struct spi_device *spi)
u32 hw_mode;
struct spi_mpc83xx_cs *cs = spi->controller_state;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
if (!spi->max_speed_hz)
return -EINVAL;
@ -562,6 +552,10 @@ mpc83xx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq)
dev_set_drvdata(dev, master);
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
| SPI_LSB_FIRST | SPI_LOOP;
master->setup = mpc83xx_spi_setup;
master->transfer = mpc83xx_spi_transfer;
master->cleanup = mpc83xx_spi_cleanup;

12
drivers/spi/spi_s3c24xx.c
View File

@ -146,19 +146,10 @@ static int s3c24xx_spi_setupxfer(struct spi_device *spi,
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
static int s3c24xx_spi_setup(struct spi_device *spi)
{
int ret;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
return -EINVAL;
}
ret = s3c24xx_spi_setupxfer(spi, NULL);
if (ret < 0) {
dev_err(&spi->dev, "setupxfer returned %d\n", ret);
@ -283,6 +274,9 @@ static int __init s3c24xx_spi_probe(struct platform_device *pdev)
/* setup the master state. */
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->num_chipselect = hw->pdata->num_cs;
master->bus_num = pdata->bus_num;

9
drivers/spi/spi_txx9.c
View File

@ -110,17 +110,11 @@ static void txx9spi_cs_func(struct spi_device *spi, struct txx9spi *c,
ndelay(cs_delay); /* CS Setup Time / CS Recovery Time */
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CS_HIGH|SPI_CPOL|SPI_CPHA)
static int txx9spi_setup(struct spi_device *spi)
{
struct txx9spi *c = spi_master_get_devdata(spi->master);
u8 bits_per_word;
if (spi->mode & ~MODEBITS)
return -EINVAL;
if (!spi->max_speed_hz
|| spi->max_speed_hz > c->max_speed_hz
|| spi->max_speed_hz < c->min_speed_hz)
@ -414,6 +408,9 @@ static int __init txx9spi_probe(struct platform_device *dev)
(unsigned long long)res->start, irq,
(c->baseclk + 500000) / 1000000);
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA;
master->bus_num = dev->id;
master->setup = txx9spi_setup;
master->transfer = txx9spi_transfer;

12
drivers/spi/xilinx_spi.c
View File

@ -158,9 +158,6 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi,
return 0;
}
/* the spi->mode bits understood by this driver: */
#define MODEBITS (SPI_CPOL | SPI_CPHA)
static int xilinx_spi_setup(struct spi_device *spi)
{
struct spi_bitbang *bitbang;
@ -170,12 +167,6 @@ static int xilinx_spi_setup(struct spi_device *spi)
xspi = spi_master_get_devdata(spi->master);
bitbang = &xspi->bitbang;
if (spi->mode & ~MODEBITS) {
dev_err(&spi->dev, "%s, unsupported mode bits %x\n",
__func__, spi->mode & ~MODEBITS);
return -EINVAL;
}
retval = xilinx_spi_setup_transfer(spi, NULL);
if (retval < 0)
return retval;
@ -327,6 +318,9 @@ static int __init xilinx_spi_of_probe(struct of_device *ofdev,
goto put_master;
}
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA;
xspi = spi_master_get_devdata(master);
xspi->bitbang.master = spi_master_get(master);
xspi->bitbang.chipselect = xilinx_spi_chipselect;

3
include/linux/spi/spi.h
View File

@ -245,6 +245,9 @@ struct spi_master {
*/
u16 dma_alignment;
/* spi_device.mode flags understood by this controller driver */
u16 mode_bits;
/* Setup mode and clock, etc (spi driver may call many times).
*
* IMPORTANT: this may be called when transfers to another