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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2012-03-14 02:47:40 -0700
committerGrant Likely <grant.likely@secretlab.ca>2012-03-15 03:40:44 -0600
commitec139b67ad00647239b804d6f15315b83dba9a58 (patch)
treeaf2ccd153e4a00c57b3e0b9f7d0c00a8bebb1cf5 /drivers/spi/spi-sh-hspi.c
parent6ea41a2bee0aa540425e118133b4c97ce5f0806d (diff)
downloadlinux-linaro-stable-ec139b67ad00647239b804d6f15315b83dba9a58.tar.gz
spi: sh-hspi: convert to using core message queue
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi/spi-sh-hspi.c')
-rw-r--r--drivers/spi/spi-sh-hspi.c152
1 files changed, 55 insertions, 97 deletions
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c
index 8356ec8cfda2..42906731c40d 100644
--- a/drivers/spi/spi-sh-hspi.c
+++ b/drivers/spi/spi-sh-hspi.c
@@ -27,7 +27,6 @@
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/list.h>
-#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
@@ -50,11 +49,7 @@
struct hspi_priv {
void __iomem *addr;
struct spi_master *master;
- struct list_head queue;
- struct workqueue_struct *workqueue;
- struct work_struct ws;
struct device *dev;
- spinlock_t lock;
};
/*
@@ -148,88 +143,82 @@ static int hspi_pop(struct hspi_priv *hspi, struct spi_message *msg,
return 0;
}
-static void hspi_work(struct work_struct *work)
+/*
+ * spi master function
+ */
+static int hspi_prepare_transfer(struct spi_master *master)
{
- struct hspi_priv *hspi = container_of(work, struct hspi_priv, ws);
- struct sh_hspi_info *info = hspi2info(hspi);
- struct spi_message *msg;
- struct spi_transfer *t;
- unsigned long flags;
- u32 data;
- int ret;
-
- dev_dbg(hspi->dev, "%s\n", __func__);
+ struct hspi_priv *hspi = spi_master_get_devdata(master);
- /************************ pm enable ************************/
pm_runtime_get_sync(hspi->dev);
+ return 0;
+}
- /* setup first of all in under pm_runtime */
- data = SH_HSPI_CLK_DIVC(info->flags);
+static int hspi_unprepare_transfer(struct spi_master *master)
+{
+ struct hspi_priv *hspi = spi_master_get_devdata(master);
- if (info->flags & SH_HSPI_FBS)
- data |= 1 << 7;
- if (info->flags & SH_HSPI_CLKP_HIGH)
- data |= 1 << 6;
- if (info->flags & SH_HSPI_IDIV_DIV128)
- data |= 1 << 5;
+ pm_runtime_put_sync(hspi->dev);
+ return 0;
+}
- hspi_write(hspi, SPCR, data);
- hspi_write(hspi, SPSR, 0x0);
- hspi_write(hspi, SPSCR, 0x1); /* master mode */
+static int hspi_transfer_one_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ struct hspi_priv *hspi = spi_master_get_devdata(master);
+ struct spi_transfer *t;
+ int ret;
- while (1) {
- msg = NULL;
+ dev_dbg(hspi->dev, "%s\n", __func__);
- /************************ spin lock ************************/
- spin_lock_irqsave(&hspi->lock, flags);
- if (!list_empty(&hspi->queue)) {
- msg = list_entry(hspi->queue.next,
- struct spi_message, queue);
- list_del_init(&msg->queue);
+ ret = 0;
+ list_for_each_entry(t, &msg->transfers, transfer_list) {
+ if (t->tx_buf) {
+ ret = hspi_push(hspi, msg, t);
+ if (ret < 0)
+ goto error;
}
- spin_unlock_irqrestore(&hspi->lock, flags);
- /************************ spin unlock ************************/
- if (!msg)
- break;
-
- ret = 0;
- list_for_each_entry(t, &msg->transfers, transfer_list) {
- if (t->tx_buf) {
- ret = hspi_push(hspi, msg, t);
- if (ret < 0)
- goto error;
- }
- if (t->rx_buf) {
- ret = hspi_pop(hspi, msg, t);
- if (ret < 0)
- goto error;
- }
- msg->actual_length += t->len;
+ if (t->rx_buf) {
+ ret = hspi_pop(hspi, msg, t);
+ if (ret < 0)
+ goto error;
}
-error:
- msg->status = ret;
- msg->complete(msg->context);
+ msg->actual_length += t->len;
}
+error:
- pm_runtime_put_sync(hspi->dev);
- /************************ pm disable ************************/
+ msg->status = ret;
+ spi_finalize_current_message(master);
- return;
+ return ret;
}
-/*
- * spi master function
- */
static int hspi_setup(struct spi_device *spi)
{
struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
struct device *dev = hspi->dev;
+ struct sh_hspi_info *info = hspi2info(hspi);
+ u32 data;
if (8 != spi->bits_per_word) {
dev_err(dev, "bits_per_word should be 8\n");
return -EIO;
}
+ /* setup first of all in under pm_runtime */
+ data = SH_HSPI_CLK_DIVC(info->flags);
+
+ if (info->flags & SH_HSPI_FBS)
+ data |= 1 << 7;
+ if (info->flags & SH_HSPI_CLKP_HIGH)
+ data |= 1 << 6;
+ if (info->flags & SH_HSPI_IDIV_DIV128)
+ data |= 1 << 5;
+
+ hspi_write(hspi, SPCR, data);
+ hspi_write(hspi, SPSR, 0x0);
+ hspi_write(hspi, SPSCR, 0x1); /* master mode */
+
dev_dbg(dev, "%s setup\n", spi->modalias);
return 0;
@@ -243,26 +232,6 @@ static void hspi_cleanup(struct spi_device *spi)
dev_dbg(dev, "%s cleanup\n", spi->modalias);
}
-static int hspi_transfer(struct spi_device *spi, struct spi_message *msg)
-{
- struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
- unsigned long flags;
-
- /************************ spin lock ************************/
- spin_lock_irqsave(&hspi->lock, flags);
-
- msg->actual_length = 0;
- msg->status = -EINPROGRESS;
- list_add_tail(&msg->queue, &hspi->queue);
-
- spin_unlock_irqrestore(&hspi->lock, flags);
- /************************ spin unlock ************************/
-
- queue_work(hspi->workqueue, &hspi->ws);
-
- return 0;
-}
-
static int __devinit hspi_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -296,27 +265,19 @@ static int __devinit hspi_probe(struct platform_device *pdev)
ret = -ENOMEM;
goto error1;
}
- hspi->workqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
- if (!hspi->workqueue) {
- dev_err(&pdev->dev, "create workqueue error\n");
- ret = -EBUSY;
- goto error2;
- }
-
- spin_lock_init(&hspi->lock);
- INIT_LIST_HEAD(&hspi->queue);
- INIT_WORK(&hspi->ws, hspi_work);
master->num_chipselect = 1;
master->bus_num = pdev->id;
master->setup = hspi_setup;
- master->transfer = hspi_transfer;
master->cleanup = hspi_cleanup;
master->mode_bits = SPI_CPOL | SPI_CPHA;
+ master->prepare_transfer_hardware = hspi_prepare_transfer;
+ master->transfer_one_message = hspi_transfer_one_message;
+ master->unprepare_transfer_hardware = hspi_unprepare_transfer;
ret = spi_register_master(master);
if (ret < 0) {
dev_err(&pdev->dev, "spi_register_master error.\n");
- goto error3;
+ goto error2;
}
pm_runtime_enable(&pdev->dev);
@@ -325,8 +286,6 @@ static int __devinit hspi_probe(struct platform_device *pdev)
return 0;
- error3:
- destroy_workqueue(hspi->workqueue);
error2:
devm_iounmap(hspi->dev, hspi->addr);
error1:
@@ -342,7 +301,6 @@ static int __devexit hspi_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
spi_unregister_master(hspi->master);
- destroy_workqueue(hspi->workqueue);
devm_iounmap(hspi->dev, hspi->addr);
return 0;