spi: Refactor spi-orion to use SPI framework queue.

Replace the deprecated master->transfer with transfer_one_message()
and allow the SPI subsystem handle all the queuing of messages.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@googlemail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Andrew Lunn 2012-07-23 13:16:55 +02:00 committed by Mark Brown
parent d9875690d9
commit ba59a80788
1 changed files with 64 additions and 151 deletions

View File

@ -36,12 +36,6 @@
#define ORION_SPI_CLK_PRESCALE_MASK 0x1F
struct orion_spi {
struct work_struct work;
/* Lock access to transfer list. */
spinlock_t lock;
struct list_head msg_queue;
struct spi_master *master;
void __iomem *base;
unsigned int max_speed;
@ -49,8 +43,6 @@ struct orion_spi {
struct clk *clk;
};
static struct workqueue_struct *orion_spi_wq;
static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg)
{
return orion_spi->base + reg;
@ -277,73 +269,78 @@ out:
}
static void orion_spi_work(struct work_struct *work)
static int orion_spi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
struct orion_spi *orion_spi =
container_of(work, struct orion_spi, work);
struct orion_spi *orion_spi = spi_master_get_devdata(master);
struct spi_device *spi = m->spi;
struct spi_transfer *t = NULL;
int par_override = 0;
int status = 0;
int cs_active = 0;
spin_lock_irq(&orion_spi->lock);
while (!list_empty(&orion_spi->msg_queue)) {
struct spi_message *m;
struct spi_device *spi;
struct spi_transfer *t = NULL;
int par_override = 0;
int status = 0;
int cs_active = 0;
/* Load defaults */
status = orion_spi_setup_transfer(spi, NULL);
m = container_of(orion_spi->msg_queue.next, struct spi_message,
queue);
if (status < 0)
goto msg_done;
list_del_init(&m->queue);
spin_unlock_irq(&orion_spi->lock);
spi = m->spi;
/* Load defaults */
status = orion_spi_setup_transfer(spi, NULL);
if (status < 0)
list_for_each_entry(t, &m->transfers, transfer_list) {
/* make sure buffer length is even when working in 16
* bit mode*/
if ((t->bits_per_word == 16) && (t->len & 1)) {
dev_err(&spi->dev,
"message rejected : "
"odd data length %d while in 16 bit mode\n",
t->len);
status = -EIO;
goto msg_done;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (par_override || t->speed_hz || t->bits_per_word) {
par_override = 1;
status = orion_spi_setup_transfer(spi, t);
if (status < 0)
break;
if (!t->speed_hz && !t->bits_per_word)
par_override = 0;
}
if (!cs_active) {
orion_spi_set_cs(orion_spi, 1);
cs_active = 1;
}
if (t->len)
m->actual_length +=
orion_spi_write_read(spi, t);
if (t->delay_usecs)
udelay(t->delay_usecs);
if (t->cs_change) {
orion_spi_set_cs(orion_spi, 0);
cs_active = 0;
}
}
msg_done:
if (cs_active)
if (t->speed_hz && t->speed_hz < orion_spi->min_speed) {
dev_err(&spi->dev,
"message rejected : "
"device min speed (%d Hz) exceeds "
"required transfer speed (%d Hz)\n",
orion_spi->min_speed, t->speed_hz);
status = -EIO;
goto msg_done;
}
if (par_override || t->speed_hz || t->bits_per_word) {
par_override = 1;
status = orion_spi_setup_transfer(spi, t);
if (status < 0)
break;
if (!t->speed_hz && !t->bits_per_word)
par_override = 0;
}
if (!cs_active) {
orion_spi_set_cs(orion_spi, 1);
cs_active = 1;
}
if (t->len)
m->actual_length += orion_spi_write_read(spi, t);
if (t->delay_usecs)
udelay(t->delay_usecs);
if (t->cs_change) {
orion_spi_set_cs(orion_spi, 0);
m->status = status;
m->complete(m->context);
spin_lock_irq(&orion_spi->lock);
cs_active = 0;
}
}
spin_unlock_irq(&orion_spi->lock);
msg_done:
if (cs_active)
orion_spi_set_cs(orion_spi, 0);
m->status = status;
spi_finalize_current_message(master);
return 0;
}
static int __init orion_spi_reset(struct orion_spi *orion_spi)
@ -376,75 +373,6 @@ static int orion_spi_setup(struct spi_device *spi)
return 0;
}
static int orion_spi_transfer(struct spi_device *spi, struct spi_message *m)
{
struct orion_spi *orion_spi;
struct spi_transfer *t = NULL;
unsigned long flags;
m->actual_length = 0;
m->status = 0;
/* reject invalid messages and transfers */
if (list_empty(&m->transfers) || !m->complete)
return -EINVAL;
orion_spi = spi_master_get_devdata(spi->master);
list_for_each_entry(t, &m->transfers, transfer_list) {
unsigned int bits_per_word = spi->bits_per_word;
if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
dev_err(&spi->dev,
"message rejected : "
"invalid transfer data buffers\n");
goto msg_rejected;
}
if (t->bits_per_word)
bits_per_word = t->bits_per_word;
if ((bits_per_word != 8) && (bits_per_word != 16)) {
dev_err(&spi->dev,
"message rejected : "
"invalid transfer bits_per_word (%d bits)\n",
bits_per_word);
goto msg_rejected;
}
/*make sure buffer length is even when working in 16 bit mode*/
if ((t->bits_per_word == 16) && (t->len & 1)) {
dev_err(&spi->dev,
"message rejected : "
"odd data length (%d) while in 16 bit mode\n",
t->len);
goto msg_rejected;
}
if (t->speed_hz && t->speed_hz < orion_spi->min_speed) {
dev_err(&spi->dev,
"message rejected : "
"device min speed (%d Hz) exceeds "
"required transfer speed (%d Hz)\n",
orion_spi->min_speed, t->speed_hz);
goto msg_rejected;
}
}
spin_lock_irqsave(&orion_spi->lock, flags);
list_add_tail(&m->queue, &orion_spi->msg_queue);
queue_work(orion_spi_wq, &orion_spi->work);
spin_unlock_irqrestore(&orion_spi->lock, flags);
return 0;
msg_rejected:
/* Message rejected and not queued */
m->status = -EINVAL;
if (m->complete)
m->complete(m->context);
return -EINVAL;
}
static int __init orion_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
@ -474,7 +402,7 @@ static int __init orion_spi_probe(struct platform_device *pdev)
master->mode_bits = 0;
master->setup = orion_spi_setup;
master->transfer = orion_spi_transfer;
master->transfer_one_message = orion_spi_transfer_one_message;
master->num_chipselect = ORION_NUM_CHIPSELECTS;
dev_set_drvdata(&pdev->dev, master);
@ -507,11 +435,6 @@ static int __init orion_spi_probe(struct platform_device *pdev)
}
spi->base = ioremap(r->start, SZ_1K);
INIT_WORK(&spi->work, orion_spi_work);
spin_lock_init(&spi->lock);
INIT_LIST_HEAD(&spi->msg_queue);
if (orion_spi_reset(spi) < 0)
goto out_rel_mem;
@ -536,14 +459,12 @@ out:
static int __exit orion_spi_remove(struct platform_device *pdev)
{
struct spi_master *master;
struct orion_spi *spi;
struct resource *r;
struct orion_spi *spi;
master = dev_get_drvdata(&pdev->dev);
spi = spi_master_get_devdata(master);
cancel_work_sync(&spi->work);
clk_disable_unprepare(spi->clk);
clk_put(spi->clk);
@ -574,21 +495,13 @@ static struct platform_driver orion_spi_driver = {
static int __init orion_spi_init(void)
{
orion_spi_wq = create_singlethread_workqueue(
orion_spi_driver.driver.name);
if (orion_spi_wq == NULL)
return -ENOMEM;
return platform_driver_probe(&orion_spi_driver, orion_spi_probe);
}
module_init(orion_spi_init);
static void __exit orion_spi_exit(void)
{
flush_workqueue(orion_spi_wq);
platform_driver_unregister(&orion_spi_driver);
destroy_workqueue(orion_spi_wq);
}
module_exit(orion_spi_exit);