mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
spi_mpc83xx: much improved driver
The current driver may cause glitches on SPI CLK line since one must disable the SPI controller before changing any HW settings. Fix this by implementing a local spi_transfer function that won't change speed and/or word size while CS is active. While doing that heavy lifting a few other issues were addressed too: - Make word size 16 and 32 work too. - Honor bits_per_word and speed_hz in spi transaction. - Optimize the common path. This also stops using the "bitbang" framework (except for a few constants). [Roel Kluin <12o3l@tiscali.nl>: "irq" needs to be signed] Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> 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:
Joakim Tjernlund
Linus Torvalds
parent
f4ed0deae8
commit
c9bfcb3151
2 changed files with 288 additions and 136 deletions
|
|
@ -126,7 +126,6 @@ config SPI_MPC52xx_PSC
|
|||
config SPI_MPC83xx
|
||||
tristate "Freescale MPC83xx/QUICC Engine SPI controller"
|
||||
depends on SPI_MASTER && (PPC_83xx || QUICC_ENGINE) && EXPERIMENTAL
|
||||
select SPI_BITBANG
|
||||
help
|
||||
This enables using the Freescale MPC83xx and QUICC Engine SPI
|
||||
controllers in master mode.
|
||||
|
|
|
|||
|
|
@ -49,6 +49,7 @@ struct mpc83xx_spi_reg {
|
|||
#define SPMODE_LEN(x) ((x) << 20)
|
||||
#define SPMODE_PM(x) ((x) << 16)
|
||||
#define SPMODE_OP (1 << 14)
|
||||
#define SPMODE_CG(x) ((x) << 7)
|
||||
|
||||
/*
|
||||
* Default for SPI Mode:
|
||||
|
|
@ -67,10 +68,6 @@ struct mpc83xx_spi_reg {
|
|||
|
||||
/* SPI Controller driver's private data. */
|
||||
struct mpc83xx_spi {
|
||||
/* bitbang has to be first */
|
||||
struct spi_bitbang bitbang;
|
||||
struct completion done;
|
||||
|
||||
struct mpc83xx_spi_reg __iomem *base;
|
||||
|
||||
/* rx & tx bufs from the spi_transfer */
|
||||
|
|
@ -82,7 +79,7 @@ struct mpc83xx_spi {
|
|||
u32(*get_tx) (struct mpc83xx_spi *);
|
||||
|
||||
unsigned int count;
|
||||
u32 irq;
|
||||
int irq;
|
||||
|
||||
unsigned nsecs; /* (clock cycle time)/2 */
|
||||
|
||||
|
|
@ -94,6 +91,25 @@ struct mpc83xx_spi {
|
|||
|
||||
void (*activate_cs) (u8 cs, u8 polarity);
|
||||
void (*deactivate_cs) (u8 cs, u8 polarity);
|
||||
|
||||
u8 busy;
|
||||
|
||||
struct workqueue_struct *workqueue;
|
||||
struct work_struct work;
|
||||
|
||||
struct list_head queue;
|
||||
spinlock_t lock;
|
||||
|
||||
struct completion done;
|
||||
};
|
||||
|
||||
struct spi_mpc83xx_cs {
|
||||
/* functions to deal with different sized buffers */
|
||||
void (*get_rx) (u32 rx_data, struct mpc83xx_spi *);
|
||||
u32 (*get_tx) (struct mpc83xx_spi *);
|
||||
u32 rx_shift; /* RX data reg shift when in qe mode */
|
||||
u32 tx_shift; /* TX data reg shift when in qe mode */
|
||||
u32 hw_mode; /* Holds HW mode register settings */
|
||||
};
|
||||
|
||||
static inline void mpc83xx_spi_write_reg(__be32 __iomem * reg, u32 val)
|
||||
|
|
@ -137,6 +153,7 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value)
|
|||
{
|
||||
struct mpc83xx_spi *mpc83xx_spi;
|
||||
u8 pol = spi->mode & SPI_CS_HIGH ? 1 : 0;
|
||||
struct spi_mpc83xx_cs *cs = spi->controller_state;
|
||||
|
||||
mpc83xx_spi = spi_master_get_devdata(spi->master);
|
||||
|
||||
|
|
@ -147,50 +164,26 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value)
|
|||
|
||||
if (value == BITBANG_CS_ACTIVE) {
|
||||
u32 regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
|
||||
u32 len = spi->bits_per_word;
|
||||
u8 pm;
|
||||
|
||||
if (len == 32)
|
||||
len = 0;
|
||||
else
|
||||
len = len - 1;
|
||||
mpc83xx_spi->rx_shift = cs->rx_shift;
|
||||
mpc83xx_spi->tx_shift = cs->tx_shift;
|
||||
mpc83xx_spi->get_rx = cs->get_rx;
|
||||
mpc83xx_spi->get_tx = cs->get_tx;
|
||||
|
||||
/* mask out bits we are going to set */
|
||||
regval &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
|
||||
| SPMODE_LEN(0xF) | SPMODE_DIV16
|
||||
| SPMODE_PM(0xF) | SPMODE_REV | SPMODE_LOOP);
|
||||
if (cs->hw_mode != regval) {
|
||||
unsigned long flags;
|
||||
void *tmp_ptr = &mpc83xx_spi->base->mode;
|
||||
|
||||
if (spi->mode & SPI_CPHA)
|
||||
regval |= SPMODE_CP_BEGIN_EDGECLK;
|
||||
if (spi->mode & SPI_CPOL)
|
||||
regval |= SPMODE_CI_INACTIVEHIGH;
|
||||
if (!(spi->mode & SPI_LSB_FIRST))
|
||||
regval |= SPMODE_REV;
|
||||
if (spi->mode & SPI_LOOP)
|
||||
regval |= SPMODE_LOOP;
|
||||
|
||||
regval |= SPMODE_LEN(len);
|
||||
|
||||
if ((mpc83xx_spi->spibrg / spi->max_speed_hz) >= 64) {
|
||||
pm = mpc83xx_spi->spibrg / (spi->max_speed_hz * 64) - 1;
|
||||
if (pm > 0x0f) {
|
||||
dev_err(&spi->dev, "Requested speed is too "
|
||||
"low: %d Hz. Will use %d Hz instead.\n",
|
||||
spi->max_speed_hz,
|
||||
mpc83xx_spi->spibrg / 1024);
|
||||
pm = 0x0f;
|
||||
}
|
||||
regval |= SPMODE_PM(pm) | SPMODE_DIV16;
|
||||
} else {
|
||||
pm = mpc83xx_spi->spibrg / (spi->max_speed_hz * 4);
|
||||
if (pm)
|
||||
pm--;
|
||||
regval |= SPMODE_PM(pm);
|
||||
regval = cs->hw_mode;
|
||||
/* Turn off IRQs locally to minimize time that
|
||||
* SPI is disabled
|
||||
*/
|
||||
local_irq_save(flags);
|
||||
/* Turn off SPI unit prior changing mode */
|
||||
mpc83xx_spi_write_reg(tmp_ptr, regval & ~SPMODE_ENABLE);
|
||||
mpc83xx_spi_write_reg(tmp_ptr, regval);
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
|
||||
/* Turn off SPI unit prior changing mode */
|
||||
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0);
|
||||
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
|
||||
if (mpc83xx_spi->activate_cs)
|
||||
mpc83xx_spi->activate_cs(spi->chip_select, pol);
|
||||
}
|
||||
|
|
@ -201,8 +194,9 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
|
|||
{
|
||||
struct mpc83xx_spi *mpc83xx_spi;
|
||||
u32 regval;
|
||||
u8 bits_per_word;
|
||||
u8 bits_per_word, pm;
|
||||
u32 hz;
|
||||
struct spi_mpc83xx_cs *cs = spi->controller_state;
|
||||
|
||||
mpc83xx_spi = spi_master_get_devdata(spi->master);
|
||||
|
||||
|
|
@ -223,122 +217,106 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
|
|||
|| ((bits_per_word > 16) && (bits_per_word != 32)))
|
||||
return -EINVAL;
|
||||
|
||||
mpc83xx_spi->rx_shift = 0;
|
||||
mpc83xx_spi->tx_shift = 0;
|
||||
if (!hz)
|
||||
hz = spi->max_speed_hz;
|
||||
|
||||
cs->rx_shift = 0;
|
||||
cs->tx_shift = 0;
|
||||
if (bits_per_word <= 8) {
|
||||
mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
|
||||
mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
|
||||
cs->get_rx = mpc83xx_spi_rx_buf_u8;
|
||||
cs->get_tx = mpc83xx_spi_tx_buf_u8;
|
||||
if (mpc83xx_spi->qe_mode) {
|
||||
mpc83xx_spi->rx_shift = 16;
|
||||
mpc83xx_spi->tx_shift = 24;
|
||||
cs->rx_shift = 16;
|
||||
cs->tx_shift = 24;
|
||||
}
|
||||
} else if (bits_per_word <= 16) {
|
||||
mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u16;
|
||||
mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u16;
|
||||
cs->get_rx = mpc83xx_spi_rx_buf_u16;
|
||||
cs->get_tx = mpc83xx_spi_tx_buf_u16;
|
||||
if (mpc83xx_spi->qe_mode) {
|
||||
mpc83xx_spi->rx_shift = 16;
|
||||
mpc83xx_spi->tx_shift = 16;
|
||||
cs->rx_shift = 16;
|
||||
cs->tx_shift = 16;
|
||||
}
|
||||
} else if (bits_per_word <= 32) {
|
||||
mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u32;
|
||||
mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u32;
|
||||
cs->get_rx = mpc83xx_spi_rx_buf_u32;
|
||||
cs->get_tx = mpc83xx_spi_tx_buf_u32;
|
||||
} else
|
||||
return -EINVAL;
|
||||
|
||||
if (mpc83xx_spi->qe_mode && spi->mode & SPI_LSB_FIRST) {
|
||||
mpc83xx_spi->tx_shift = 0;
|
||||
cs->tx_shift = 0;
|
||||
if (bits_per_word <= 8)
|
||||
mpc83xx_spi->rx_shift = 8;
|
||||
cs->rx_shift = 8;
|
||||
else
|
||||
mpc83xx_spi->rx_shift = 0;
|
||||
cs->rx_shift = 0;
|
||||
}
|
||||
|
||||
/* nsecs = (clock period)/2 */
|
||||
if (!hz)
|
||||
hz = spi->max_speed_hz;
|
||||
mpc83xx_spi->nsecs = (1000000000 / 2) / hz;
|
||||
if (mpc83xx_spi->nsecs > MAX_UDELAY_MS * 1000)
|
||||
return -EINVAL;
|
||||
mpc83xx_spi->rx_shift = cs->rx_shift;
|
||||
mpc83xx_spi->tx_shift = cs->tx_shift;
|
||||
mpc83xx_spi->get_rx = cs->get_rx;
|
||||
mpc83xx_spi->get_tx = cs->get_tx;
|
||||
|
||||
if (bits_per_word == 32)
|
||||
bits_per_word = 0;
|
||||
else
|
||||
bits_per_word = bits_per_word - 1;
|
||||
|
||||
regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
|
||||
|
||||
/* mask out bits we are going to set */
|
||||
regval &= ~(SPMODE_LEN(0xF) | SPMODE_REV);
|
||||
regval |= SPMODE_LEN(bits_per_word);
|
||||
if (!(spi->mode & SPI_LSB_FIRST))
|
||||
regval |= SPMODE_REV;
|
||||
cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
|
||||
| SPMODE_PM(0xF));
|
||||
|
||||
/* Turn off SPI unit prior changing mode */
|
||||
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0);
|
||||
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
|
||||
cs->hw_mode |= SPMODE_LEN(bits_per_word);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* 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 spi_bitbang *bitbang;
|
||||
struct mpc83xx_spi *mpc83xx_spi;
|
||||
int retval;
|
||||
|
||||
if (spi->mode & ~MODEBITS) {
|
||||
dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n",
|
||||
spi->mode & ~MODEBITS);
|
||||
return -EINVAL;
|
||||
if ((mpc83xx_spi->spibrg / hz) >= 64) {
|
||||
pm = mpc83xx_spi->spibrg / (hz * 64) - 1;
|
||||
if (pm > 0x0f) {
|
||||
dev_err(&spi->dev, "Requested speed is too "
|
||||
"low: %d Hz. Will use %d Hz instead.\n",
|
||||
hz, mpc83xx_spi->spibrg / 1024);
|
||||
pm = 0x0f;
|
||||
}
|
||||
cs->hw_mode |= SPMODE_PM(pm) | SPMODE_DIV16;
|
||||
} else {
|
||||
pm = mpc83xx_spi->spibrg / (hz * 4);
|
||||
if (pm)
|
||||
pm--;
|
||||
cs->hw_mode |= SPMODE_PM(pm);
|
||||
}
|
||||
regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
|
||||
if (cs->hw_mode != regval) {
|
||||
unsigned long flags;
|
||||
void *tmp_ptr = &mpc83xx_spi->base->mode;
|
||||
|
||||
if (!spi->max_speed_hz)
|
||||
return -EINVAL;
|
||||
|
||||
bitbang = spi_master_get_devdata(spi->master);
|
||||
mpc83xx_spi = spi_master_get_devdata(spi->master);
|
||||
|
||||
if (!spi->bits_per_word)
|
||||
spi->bits_per_word = 8;
|
||||
|
||||
retval = mpc83xx_spi_setup_transfer(spi, NULL);
|
||||
if (retval < 0)
|
||||
return retval;
|
||||
|
||||
dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec\n",
|
||||
__func__, spi->mode & (SPI_CPOL | SPI_CPHA),
|
||||
spi->bits_per_word, 2 * mpc83xx_spi->nsecs);
|
||||
|
||||
/* NOTE we _need_ to call chipselect() early, ideally with adapter
|
||||
* setup, unless the hardware defaults cooperate to avoid confusion
|
||||
* between normal (active low) and inverted chipselects.
|
||||
*/
|
||||
|
||||
/* deselect chip (low or high) */
|
||||
spin_lock(&bitbang->lock);
|
||||
if (!bitbang->busy) {
|
||||
bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
|
||||
ndelay(mpc83xx_spi->nsecs);
|
||||
regval = cs->hw_mode;
|
||||
/* Turn off IRQs locally to minimize time
|
||||
* that SPI is disabled
|
||||
*/
|
||||
local_irq_save(flags);
|
||||
/* Turn off SPI unit prior changing mode */
|
||||
mpc83xx_spi_write_reg(tmp_ptr, regval & ~SPMODE_ENABLE);
|
||||
mpc83xx_spi_write_reg(tmp_ptr, regval);
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
spin_unlock(&bitbang->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mpc83xx_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
|
||||
{
|
||||
struct mpc83xx_spi *mpc83xx_spi;
|
||||
u32 word;
|
||||
u32 word, len, bits_per_word;
|
||||
|
||||
mpc83xx_spi = spi_master_get_devdata(spi->master);
|
||||
|
||||
mpc83xx_spi->tx = t->tx_buf;
|
||||
mpc83xx_spi->rx = t->rx_buf;
|
||||
mpc83xx_spi->count = t->len;
|
||||
bits_per_word = spi->bits_per_word;
|
||||
if (t->bits_per_word)
|
||||
bits_per_word = t->bits_per_word;
|
||||
len = t->len;
|
||||
if (bits_per_word > 8)
|
||||
len /= 2;
|
||||
if (bits_per_word > 16)
|
||||
len /= 2;
|
||||
mpc83xx_spi->count = len;
|
||||
INIT_COMPLETION(mpc83xx_spi->done);
|
||||
|
||||
/* enable rx ints */
|
||||
|
|
@ -353,7 +331,147 @@ static int mpc83xx_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
|
|||
/* disable rx ints */
|
||||
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0);
|
||||
|
||||
return t->len - mpc83xx_spi->count;
|
||||
return mpc83xx_spi->count;
|
||||
}
|
||||
|
||||
static void mpc83xx_spi_work(struct work_struct *work)
|
||||
{
|
||||
struct mpc83xx_spi *mpc83xx_spi =
|
||||
container_of(work, struct mpc83xx_spi, work);
|
||||
|
||||
spin_lock_irq(&mpc83xx_spi->lock);
|
||||
mpc83xx_spi->busy = 1;
|
||||
while (!list_empty(&mpc83xx_spi->queue)) {
|
||||
struct spi_message *m;
|
||||
struct spi_device *spi;
|
||||
struct spi_transfer *t = NULL;
|
||||
unsigned cs_change;
|
||||
int status, nsecs = 50;
|
||||
|
||||
m = container_of(mpc83xx_spi->queue.next,
|
||||
struct spi_message, queue);
|
||||
list_del_init(&m->queue);
|
||||
spin_unlock_irq(&mpc83xx_spi->lock);
|
||||
|
||||
spi = m->spi;
|
||||
cs_change = 1;
|
||||
status = 0;
|
||||
list_for_each_entry(t, &m->transfers, transfer_list) {
|
||||
if (t->bits_per_word || t->speed_hz) {
|
||||
/* Don't allow changes if CS is active */
|
||||
status = -EINVAL;
|
||||
|
||||
if (cs_change)
|
||||
status = mpc83xx_spi_setup_transfer(spi, t);
|
||||
if (status < 0)
|
||||
break;
|
||||
}
|
||||
|
||||
if (cs_change)
|
||||
mpc83xx_spi_chipselect(spi, BITBANG_CS_ACTIVE);
|
||||
cs_change = t->cs_change;
|
||||
if (t->len)
|
||||
status = mpc83xx_spi_bufs(spi, t);
|
||||
if (status) {
|
||||
status = -EMSGSIZE;
|
||||
break;
|
||||
}
|
||||
m->actual_length += t->len;
|
||||
|
||||
if (t->delay_usecs)
|
||||
udelay(t->delay_usecs);
|
||||
|
||||
if (cs_change) {
|
||||
ndelay(nsecs);
|
||||
mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE);
|
||||
ndelay(nsecs);
|
||||
}
|
||||
}
|
||||
|
||||
m->status = status;
|
||||
m->complete(m->context);
|
||||
|
||||
if (status || !cs_change) {
|
||||
ndelay(nsecs);
|
||||
mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE);
|
||||
}
|
||||
|
||||
mpc83xx_spi_setup_transfer(spi, NULL);
|
||||
|
||||
spin_lock_irq(&mpc83xx_spi->lock);
|
||||
}
|
||||
mpc83xx_spi->busy = 0;
|
||||
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;
|
||||
int retval;
|
||||
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;
|
||||
|
||||
if (!cs) {
|
||||
cs = kzalloc(sizeof *cs, GFP_KERNEL);
|
||||
if (!cs)
|
||||
return -ENOMEM;
|
||||
spi->controller_state = cs;
|
||||
}
|
||||
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 */
|
||||
cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
|
||||
| SPMODE_REV | SPMODE_LOOP);
|
||||
|
||||
if (spi->mode & SPI_CPHA)
|
||||
cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
|
||||
if (spi->mode & SPI_CPOL)
|
||||
cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
|
||||
if (!(spi->mode & SPI_LSB_FIRST))
|
||||
cs->hw_mode |= SPMODE_REV;
|
||||
if (spi->mode & SPI_LOOP)
|
||||
cs->hw_mode |= SPMODE_LOOP;
|
||||
|
||||
retval = mpc83xx_spi_setup_transfer(spi, NULL);
|
||||
if (retval < 0) {
|
||||
cs->hw_mode = hw_mode; /* Restore settings */
|
||||
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
|
||||
* between normal (active low) and inverted chipselects.
|
||||
*/
|
||||
|
||||
/* deselect chip (low or high) */
|
||||
spin_lock(&mpc83xx_spi->lock);
|
||||
if (!mpc83xx_spi->busy)
|
||||
mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE);
|
||||
spin_unlock(&mpc83xx_spi->lock);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
irqreturn_t mpc83xx_spi_irq(s32 irq, void *context_data)
|
||||
|
|
@ -395,6 +513,28 @@ irqreturn_t mpc83xx_spi_irq(s32 irq, void *context_data)
|
|||
|
||||
return ret;
|
||||
}
|
||||
static int mpc83xx_spi_transfer(struct spi_device *spi,
|
||||
struct spi_message *m)
|
||||
{
|
||||
struct mpc83xx_spi *mpc83xx_spi = spi_master_get_devdata(spi->master);
|
||||
unsigned long flags;
|
||||
|
||||
m->actual_length = 0;
|
||||
m->status = -EINPROGRESS;
|
||||
|
||||
spin_lock_irqsave(&mpc83xx_spi->lock, flags);
|
||||
list_add_tail(&m->queue, &mpc83xx_spi->queue);
|
||||
queue_work(mpc83xx_spi->workqueue, &mpc83xx_spi->work);
|
||||
spin_unlock_irqrestore(&mpc83xx_spi->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static void mpc83xx_spi_cleanup(struct spi_device *spi)
|
||||
{
|
||||
kfree(spi->controller_state);
|
||||
}
|
||||
|
||||
static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
||||
{
|
||||
|
|
@ -426,11 +566,11 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
|||
ret = -ENODEV;
|
||||
goto free_master;
|
||||
}
|
||||
master->setup = mpc83xx_spi_setup;
|
||||
master->transfer = mpc83xx_spi_transfer;
|
||||
master->cleanup = mpc83xx_spi_cleanup;
|
||||
|
||||
mpc83xx_spi = spi_master_get_devdata(master);
|
||||
mpc83xx_spi->bitbang.master = spi_master_get(master);
|
||||
mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
|
||||
mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
|
||||
mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
|
||||
mpc83xx_spi->activate_cs = pdata->activate_cs;
|
||||
mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
|
||||
mpc83xx_spi->qe_mode = pdata->qe_mode;
|
||||
|
|
@ -445,7 +585,6 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
|||
mpc83xx_spi->tx_shift = 24;
|
||||
}
|
||||
|
||||
mpc83xx_spi->bitbang.master->setup = mpc83xx_spi_setup;
|
||||
init_completion(&mpc83xx_spi->done);
|
||||
|
||||
mpc83xx_spi->base = ioremap(r->start, r->end - r->start + 1);
|
||||
|
|
@ -483,11 +622,21 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
|||
regval |= SPMODE_OP;
|
||||
|
||||
mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
|
||||
spin_lock_init(&mpc83xx_spi->lock);
|
||||
init_completion(&mpc83xx_spi->done);
|
||||
INIT_WORK(&mpc83xx_spi->work, mpc83xx_spi_work);
|
||||
INIT_LIST_HEAD(&mpc83xx_spi->queue);
|
||||
|
||||
ret = spi_bitbang_start(&mpc83xx_spi->bitbang);
|
||||
|
||||
if (ret != 0)
|
||||
mpc83xx_spi->workqueue = create_singlethread_workqueue(
|
||||
master->dev.parent->bus_id);
|
||||
if (mpc83xx_spi->workqueue == NULL) {
|
||||
ret = -EBUSY;
|
||||
goto free_irq;
|
||||
}
|
||||
|
||||
ret = spi_register_master(master);
|
||||
if (ret < 0)
|
||||
goto unreg_master;
|
||||
|
||||
printk(KERN_INFO
|
||||
"%s: MPC83xx SPI Controller driver at 0x%p (irq = %d)\n",
|
||||
|
|
@ -495,6 +644,8 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
|
|||
|
||||
return ret;
|
||||
|
||||
unreg_master:
|
||||
destroy_workqueue(mpc83xx_spi->workqueue);
|
||||
free_irq:
|
||||
free_irq(mpc83xx_spi->irq, mpc83xx_spi);
|
||||
unmap_io:
|
||||
|
|
@ -515,10 +666,12 @@ static int __exit mpc83xx_spi_remove(struct platform_device *dev)
|
|||
master = platform_get_drvdata(dev);
|
||||
mpc83xx_spi = spi_master_get_devdata(master);
|
||||
|
||||
spi_bitbang_stop(&mpc83xx_spi->bitbang);
|
||||
flush_workqueue(mpc83xx_spi->workqueue);
|
||||
destroy_workqueue(mpc83xx_spi->workqueue);
|
||||
spi_unregister_master(master);
|
||||
|
||||
free_irq(mpc83xx_spi->irq, mpc83xx_spi);
|
||||
iounmap(mpc83xx_spi->base);
|
||||
spi_master_put(mpc83xx_spi->bitbang.master);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue