提交 7d077197 编写于 作者: D David Brownell 提交者: Linus Torvalds

spi: move common spi_setup() functionality into core

Start moving some spi_setup() functionality into the SPI core from the
various spi_master controller drivers:

 - Make that function stop being an inline;

 - Move two common idioms from drivers into that new function:
    * Default bits_per_word to 8 if that field isn't set
    * Issue a standardized dev_dbg() message

This is a net minor source code shrink, and supports enhancments found in
some follow-up patches.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 b4bd2aba
......@@ -555,8 +555,6 @@ static int atmel_spi_setup(struct spi_device *spi)
return -EINVAL;
}
if (bits == 0)
bits = 8;
if (bits < 8 || bits > 16) {
dev_dbg(&spi->dev,
"setup: invalid bits_per_word %u (8 to 16)\n",
......
......@@ -291,8 +291,6 @@ static int au1550_spi_setup(struct spi_device *spi)
{
struct au1550_spi *hw = spi_master_get_devdata(spi->master);
if (spi->bits_per_word == 0)
spi->bits_per_word = 8;
if (spi->bits_per_word < 4 || spi->bits_per_word > 24) {
dev_err(&spi->dev, "setup: invalid bits_per_word=%d\n",
spi->bits_per_word);
......
......@@ -619,9 +619,7 @@ static int omap2_mcspi_setup(struct spi_device *spi)
return -EINVAL;
}
if (spi->bits_per_word == 0)
spi->bits_per_word = 8;
else if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
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);
return -EINVAL;
......
......@@ -339,8 +339,6 @@ static int uwire_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
bits = spi->bits_per_word;
if (t != NULL && t->bits_per_word)
bits = t->bits_per_word;
if (!bits)
bits = 8;
if (bits > 16) {
pr_debug("%s: wordsize %d?\n", dev_name(&spi->dev), bits);
......
......@@ -369,9 +369,6 @@ static int orion_spi_setup(struct spi_device *spi)
orion_spi_setbits(orion_spi, ORION_SPI_IF_CONFIG_REG,
(1 << 14));
if (spi->bits_per_word == 0)
spi->bits_per_word = 8;
if ((spi->max_speed_hz == 0)
|| (spi->max_speed_hz > orion_spi->max_speed))
spi->max_speed_hz = orion_spi->max_speed;
......
......@@ -1236,9 +1236,6 @@ static int setup(struct spi_device *spi)
uint tx_thres = TX_THRESH_DFLT;
uint rx_thres = RX_THRESH_DFLT;
if (!spi->bits_per_word)
spi->bits_per_word = 8;
if (drv_data->ssp_type != PXA25x_SSP
&& (spi->bits_per_word < 4 || spi->bits_per_word > 32)) {
dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d "
......@@ -1328,18 +1325,14 @@ static int setup(struct spi_device *spi)
/* NOTE: PXA25x_SSP _could_ use external clocking ... */
if (drv_data->ssp_type != PXA25x_SSP)
dev_dbg(&spi->dev, "%d bits/word, %ld Hz, mode %d, %s\n",
spi->bits_per_word,
dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
clk_get_rate(ssp->clk)
/ (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
spi->mode & 0x3,
chip->enable_dma ? "DMA" : "PIO");
else
dev_dbg(&spi->dev, "%d bits/word, %ld Hz, mode %d, %s\n",
spi->bits_per_word,
dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
clk_get_rate(ssp->clk) / 2
/ (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
spi->mode & 0x3,
chip->enable_dma ? "DMA" : "PIO");
if (spi->bits_per_word <= 8) {
......
......@@ -265,7 +265,7 @@ int spi_add_device(struct spi_device *spi)
* normally rely on the device being setup. Devices
* using SPI_CS_HIGH can't coexist well otherwise...
*/
status = spi->master->setup(spi);
status = spi_setup(spi);
if (status < 0) {
dev_err(dev, "can't %s %s, status %d\n",
"setup", dev_name(&spi->dev), status);
......@@ -583,6 +583,59 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master);
/*-------------------------------------------------------------------------*/
/* Core methods for SPI master protocol drivers. Some of the
* other core methods are currently defined as inline functions.
*/
/**
* spi_setup - setup SPI mode and clock rate
* @spi: the device whose settings are being modified
* Context: can sleep, and no requests are queued to the device
*
* SPI protocol drivers may need to update the transfer mode if the
* device doesn't work with its default. They may likewise need
* to update clock rates or word sizes from initial values. This function
* changes those settings, and must be called from a context that can sleep.
* Except for SPI_CS_HIGH, which takes effect immediately, the changes take
* effect the next time the device is selected and data is transferred to
* or from it. When this function returns, the spi device is deselected.
*
* Note that this call will fail if the protocol driver specifies an option
* that the underlying controller or its driver does not support. For
* example, not all hardware supports wire transfers using nine bit words,
* LSB-first wire encoding, or active-high chipselects.
*/
int spi_setup(struct spi_device *spi)
{
int status;
if (!spi->bits_per_word)
spi->bits_per_word = 8;
status = spi->master->setup(spi);
dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s"
"%u bits/w, %u Hz max --> %d\n",
(int) (spi->mode & (SPI_CPOL | SPI_CPHA)),
(spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",
(spi->mode & SPI_LSB_FIRST) ? "lsb, " : "",
(spi->mode & SPI_3WIRE) ? "3wire, " : "",
(spi->mode & SPI_LOOP) ? "loopback, " : "",
spi->bits_per_word, spi->max_speed_hz,
status);
return status;
}
EXPORT_SYMBOL_GPL(spi_setup);
/*-------------------------------------------------------------------------*/
/* Utility methods for SPI master protocol drivers, layered on
* top of the core. Some other utility methods are defined as
* inline functions.
*/
static void spi_complete(void *arg)
{
complete(arg);
......
......@@ -1016,10 +1016,6 @@ static int bfin_spi_setup(struct spi_device *spi)
return -EINVAL;
}
/* Zero (the default) here means 8 bits */
if (!spi->bits_per_word)
spi->bits_per_word = 8;
if (spi->bits_per_word != 8 && spi->bits_per_word != 16)
return -EINVAL;
......
......@@ -201,9 +201,6 @@ int spi_bitbang_setup(struct spi_device *spi)
spi->controller_state = cs;
}
if (!spi->bits_per_word)
spi->bits_per_word = 8;
/* per-word shift register access, in hardware or bitbanging */
cs->txrx_word = bitbang->txrx_word[spi->mode & (SPI_CPOL|SPI_CPHA)];
if (!cs->txrx_word)
......@@ -213,9 +210,7 @@ int spi_bitbang_setup(struct spi_device *spi)
if (retval < 0)
return retval;
dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n",
__func__, spi->mode & (SPI_CPOL | SPI_CPHA),
spi->bits_per_word, 2 * cs->nsecs);
dev_dbg(&spi->dev, "%s, %u nsec/bit\n", __func__, 2 * cs->nsecs);
/* NOTE we _need_ to call chipselect() early, ideally with adapter
* setup, unless the hardware defaults cooperate to avoid confusion
......
......@@ -1286,10 +1286,7 @@ static int setup(struct spi_device *spi)
/* SPI word width */
tmp = spi->bits_per_word;
if (tmp == 0) {
tmp = 8;
spi->bits_per_word = 8;
} else if (tmp > 16) {
if (tmp > 16) {
status = -EINVAL;
dev_err(&spi->dev,
"setup - "
......
......@@ -447,9 +447,6 @@ static int mpc83xx_spi_setup(struct spi_device *spi)
}
mpc83xx_spi = spi_master_get_devdata(spi->master);
if (!spi->bits_per_word)
spi->bits_per_word = 8;
hw_mode = cs->hw_mode; /* Save orginal settings */
cs->hw_mode = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
/* mask out bits we are going to set */
......@@ -471,9 +468,6 @@ static int mpc83xx_spi_setup(struct spi_device *spi)
return retval;
}
dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u Hz\n",
__func__, spi->mode & (SPI_CPOL | SPI_CPHA),
spi->bits_per_word, spi->max_speed_hz);
#if 0 /* Don't think this is needed */
/* NOTE we _need_ to call chipselect() early, ideally with adapter
* setup, unless the hardware defaults cooperate to avoid confusion
......
......@@ -153,9 +153,6 @@ static int s3c24xx_spi_setup(struct spi_device *spi)
{
int ret;
if (!spi->bits_per_word)
spi->bits_per_word = 8;
if (spi->mode & ~MODEBITS) {
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
spi->mode & ~MODEBITS);
......@@ -168,10 +165,6 @@ static int s3c24xx_spi_setup(struct spi_device *spi)
return ret;
}
dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n",
__func__, spi->mode, spi->bits_per_word,
spi->max_speed_hz);
return 0;
}
......
......@@ -126,7 +126,7 @@ static int txx9spi_setup(struct spi_device *spi)
|| spi->max_speed_hz < c->min_speed_hz)
return -EINVAL;
bits_per_word = spi->bits_per_word ? : 8;
bits_per_word = spi->bits_per_word;
if (bits_per_word != 8 && bits_per_word != 16)
return -EINVAL;
......
......@@ -170,9 +170,6 @@ static int xilinx_spi_setup(struct spi_device *spi)
xspi = spi_master_get_devdata(spi->master);
bitbang = &xspi->bitbang;
if (!spi->bits_per_word)
spi->bits_per_word = 8;
if (spi->mode & ~MODEBITS) {
dev_err(&spi->dev, "%s, unsupported mode bits %x\n",
__func__, spi->mode & ~MODEBITS);
......@@ -183,9 +180,6 @@ static int xilinx_spi_setup(struct spi_device *spi)
if (retval < 0)
return retval;
dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n",
__func__, spi->mode & MODEBITS, spi->bits_per_word, 0);
return 0;
}
......
......@@ -523,30 +523,7 @@ static inline void spi_message_free(struct spi_message *m)
kfree(m);
}
/**
* spi_setup - setup SPI mode and clock rate
* @spi: the device whose settings are being modified
* Context: can sleep, and no requests are queued to the device
*
* SPI protocol drivers may need to update the transfer mode if the
* device doesn't work with its default. They may likewise need
* to update clock rates or word sizes from initial values. This function
* changes those settings, and must be called from a context that can sleep.
* Except for SPI_CS_HIGH, which takes effect immediately, the changes take
* effect the next time the device is selected and data is transferred to
* or from it. When this function returns, the spi device is deselected.
*
* Note that this call will fail if the protocol driver specifies an option
* that the underlying controller or its driver does not support. For
* example, not all hardware supports wire transfers using nine bit words,
* LSB-first wire encoding, or active-high chipselects.
*/
static inline int
spi_setup(struct spi_device *spi)
{
return spi->master->setup(spi);
}
extern int spi_setup(struct spi_device *spi);
/**
* spi_async - asynchronous SPI transfer
......
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