mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

spi/spi-atmel: add flag to controller data for lock operations 

Will allow to drop the lock during DMA operations.

Replacing non-irqsave versions with irqsave versions of the lock
to make it correct in both pdc and dmaengine transfer mode

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
[wenyou.yang@atmel.com: submit the patch]
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Tested-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Nicolas Ferre 2013-04-03 13:58:36 +08:00 committed by Mark Brown
parent dfab30ee61
commit 8aad7924b5
1 changed files with 21 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/spi/spi-atmel.c
View File

@ -195,6 +195,7 @@ struct atmel_spi_caps {
*/
struct atmel_spi {
spinlock_t lock;
unsigned long flags;
phys_addr_t phybase;
void __iomem *regs;
@ -333,6 +334,16 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
gpio_set_value(asd->npcs_pin, !active);
}
static void atmel_spi_lock(struct atmel_spi *as)
{
spin_lock_irqsave(&as->lock, as->flags);
}
static void atmel_spi_unlock(struct atmel_spi *as)
{
spin_unlock_irqrestore(&as->lock, as->flags);
}
static inline int atmel_spi_xfer_is_last(struct spi_message *msg,
struct spi_transfer *xfer)
{
@ -569,9 +580,9 @@ atmel_spi_msg_done(struct spi_master *master, struct atmel_spi *as,
"xfer complete: %u bytes transferred\n",
msg->actual_length);
spin_unlock(&as->lock);
atmel_spi_unlock(as);
msg->complete(msg->context);
spin_lock(&as->lock);
atmel_spi_lock(as);
as->current_transfer = NULL;
as->next_transfer = NULL;
@ -594,7 +605,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
u32 status, pending, imr;
int ret = IRQ_NONE;
spin_lock(&as->lock);
atmel_spi_lock(as);
xfer = as->current_transfer;
msg = list_entry(as->queue.next, struct spi_message, queue);
@ -697,7 +708,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
}
}
spin_unlock(&as->lock);
atmel_spi_unlock(as);
return ret;
}
@ -802,13 +813,11 @@ static int atmel_spi_setup(struct spi_device *spi)
spi->controller_state = asd;
gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH));
} else {
unsigned long flags;
spin_lock_irqsave(&as->lock, flags);
atmel_spi_lock(as);
if (as->stay == spi)
as->stay = NULL;
cs_deactivate(as, spi);
spin_unlock_irqrestore(&as->lock, flags);
atmel_spi_unlock(as);
}
asd->csr = csr;
@ -827,7 +836,6 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
{
struct atmel_spi *as;
struct spi_transfer *xfer;
unsigned long flags;
struct device *controller = spi->master->dev.parent;
u8 bits;
struct atmel_spi_device *asd;
@ -892,11 +900,11 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
msg->status = -EINPROGRESS;
msg->actual_length = 0;
spin_lock_irqsave(&as->lock, flags);
atmel_spi_lock(as);
list_add_tail(&msg->queue, &as->queue);
if (!as->current_transfer)
atmel_spi_next_message(spi->master);
spin_unlock_irqrestore(&as->lock, flags);
atmel_spi_unlock(as);
return 0;
}
@ -906,17 +914,16 @@ static void atmel_spi_cleanup(struct spi_device *spi)
struct atmel_spi *as = spi_master_get_devdata(spi->master);
struct atmel_spi_device *asd = spi->controller_state;
unsigned gpio = (unsigned) spi->controller_data;
unsigned long flags;
if (!asd)
return;
spin_lock_irqsave(&as->lock, flags);
atmel_spi_lock(as);
if (as->stay == spi) {
as->stay = NULL;
cs_deactivate(as, spi);
}
spin_unlock_irqrestore(&as->lock, flags);
atmel_spi_unlock(as);
spi->controller_state = NULL;
gpio_free(gpio);