[PATCH 2/9] SPI: Refactor spi-orion to use SPI framework queue.
Andrew Lunn
andrew at lunn.ch
Sun Jun 10 06:31:54 EDT 2012
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 at lunn.ch>
Acked-by: Linus Walleij <linus.walleij at linaro.org>
---
drivers/spi/spi-orion.c | 209 ++++++++++++++---------------------------------
1 file changed, 61 insertions(+), 148 deletions(-)
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index dfd04e9..547d983 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -35,12 +35,6 @@
#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);
-
- 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;
-
- m = container_of(orion_spi->msg_queue.next, struct spi_message,
- queue);
+ 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;
- list_del_init(&m->queue);
- spin_unlock_irq(&orion_spi->lock);
+ /* Load defaults */
+ status = orion_spi_setup_transfer(spi, NULL);
- spi = m->spi;
+ if (status < 0)
+ goto msg_done;
- /* Load defaults */
- status = orion_spi_setup_transfer(spi, NULL);
+ 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;
+ }
- if (status < 0)
+ 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;
+ }
- 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;
- }
+ 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;
}
-msg_done:
- if (cs_active)
- orion_spi_set_cs(orion_spi, 0);
+ if (!cs_active) {
+ orion_spi_set_cs(orion_spi, 1);
+ cs_active = 1;
+ }
- m->status = status;
- m->complete(m->context);
+ if (t->len)
+ m->actual_length += orion_spi_write_read(spi, t);
- spin_lock_irq(&orion_spi->lock);
+ if (t->delay_usecs)
+ udelay(t->delay_usecs);
+
+ if (t->cs_change) {
+ orion_spi_set_cs(orion_spi, 0);
+ 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;
@@ -469,7 +397,7 @@ 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);
@@ -503,11 +431,6 @@ 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;
@@ -531,14 +454,12 @@ 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);
@@ -562,21 +483,13 @@ 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);
--
1.7.10
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