mirror of
https://github.com/edk2-porting/linux-next.git
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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>
This commit is contained in:
Kuninori Morimoto
Grant Likely
parent
6ea41a2bee
commit
ec139b67ad
@ -27,7 +27,6 @@
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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@ -50,11 +49,7 @@
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struct hspi_priv {
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void __iomem *addr;
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struct spi_master *master;
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struct list_head queue;
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struct workqueue_struct *workqueue;
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struct work_struct ws;
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struct device *dev;
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spinlock_t lock;
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};
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/*
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@ -148,20 +143,67 @@ static int hspi_pop(struct hspi_priv *hspi, struct spi_message *msg,
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return 0;
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}
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static void hspi_work(struct work_struct *work)
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/*
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* spi master function
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*/
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static int hspi_prepare_transfer(struct spi_master *master)
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{
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struct hspi_priv *hspi = container_of(work, struct hspi_priv, ws);
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struct sh_hspi_info *info = hspi2info(hspi);
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struct spi_message *msg;
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struct hspi_priv *hspi = spi_master_get_devdata(master);
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pm_runtime_get_sync(hspi->dev);
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return 0;
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}
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static int hspi_unprepare_transfer(struct spi_master *master)
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{
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struct hspi_priv *hspi = spi_master_get_devdata(master);
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pm_runtime_put_sync(hspi->dev);
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return 0;
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}
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static int hspi_transfer_one_message(struct spi_master *master,
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struct spi_message *msg)
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{
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struct hspi_priv *hspi = spi_master_get_devdata(master);
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struct spi_transfer *t;
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unsigned long flags;
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u32 data;
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int ret;
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dev_dbg(hspi->dev, "%s\n", __func__);
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/************************ pm enable ************************/
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pm_runtime_get_sync(hspi->dev);
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ret = 0;
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list_for_each_entry(t, &msg->transfers, transfer_list) {
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if (t->tx_buf) {
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ret = hspi_push(hspi, msg, t);
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if (ret < 0)
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goto error;
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}
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if (t->rx_buf) {
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ret = hspi_pop(hspi, msg, t);
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if (ret < 0)
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goto error;
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}
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msg->actual_length += t->len;
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}
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error:
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msg->status = ret;
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spi_finalize_current_message(master);
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return ret;
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}
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static int hspi_setup(struct spi_device *spi)
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{
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struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
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struct device *dev = hspi->dev;
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struct sh_hspi_info *info = hspi2info(hspi);
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u32 data;
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if (8 != spi->bits_per_word) {
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dev_err(dev, "bits_per_word should be 8\n");
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return -EIO;
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}
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/* setup first of all in under pm_runtime */
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data = SH_HSPI_CLK_DIVC(info->flags);
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@ -177,59 +219,6 @@ static void hspi_work(struct work_struct *work)
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hspi_write(hspi, SPSR, 0x0);
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hspi_write(hspi, SPSCR, 0x1); /* master mode */
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while (1) {
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msg = NULL;
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/************************ spin lock ************************/
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spin_lock_irqsave(&hspi->lock, flags);
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if (!list_empty(&hspi->queue)) {
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msg = list_entry(hspi->queue.next,
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struct spi_message, queue);
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list_del_init(&msg->queue);
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}
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spin_unlock_irqrestore(&hspi->lock, flags);
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/************************ spin unlock ************************/
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if (!msg)
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break;
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ret = 0;
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list_for_each_entry(t, &msg->transfers, transfer_list) {
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if (t->tx_buf) {
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ret = hspi_push(hspi, msg, t);
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if (ret < 0)
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goto error;
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}
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if (t->rx_buf) {
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ret = hspi_pop(hspi, msg, t);
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if (ret < 0)
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goto error;
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}
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msg->actual_length += t->len;
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}
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error:
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msg->status = ret;
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msg->complete(msg->context);
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}
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pm_runtime_put_sync(hspi->dev);
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/************************ pm disable ************************/
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return;
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}
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/*
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* spi master function
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*/
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static int hspi_setup(struct spi_device *spi)
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{
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struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
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struct device *dev = hspi->dev;
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if (8 != spi->bits_per_word) {
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dev_err(dev, "bits_per_word should be 8\n");
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return -EIO;
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}
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dev_dbg(dev, "%s setup\n", spi->modalias);
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return 0;
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@ -243,26 +232,6 @@ static void hspi_cleanup(struct spi_device *spi)
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dev_dbg(dev, "%s cleanup\n", spi->modalias);
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}
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static int hspi_transfer(struct spi_device *spi, struct spi_message *msg)
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{
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struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
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unsigned long flags;
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/************************ spin lock ************************/
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spin_lock_irqsave(&hspi->lock, flags);
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msg->actual_length = 0;
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msg->status = -EINPROGRESS;
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list_add_tail(&msg->queue, &hspi->queue);
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spin_unlock_irqrestore(&hspi->lock, flags);
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/************************ spin unlock ************************/
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queue_work(hspi->workqueue, &hspi->ws);
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return 0;
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}
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static int __devinit hspi_probe(struct platform_device *pdev)
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{
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struct resource *res;
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@ -296,27 +265,19 @@ static int __devinit hspi_probe(struct platform_device *pdev)
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ret = -ENOMEM;
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goto error1;
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}
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hspi->workqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
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if (!hspi->workqueue) {
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dev_err(&pdev->dev, "create workqueue error\n");
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ret = -EBUSY;
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goto error2;
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}
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spin_lock_init(&hspi->lock);
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INIT_LIST_HEAD(&hspi->queue);
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INIT_WORK(&hspi->ws, hspi_work);
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master->num_chipselect = 1;
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master->bus_num = pdev->id;
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master->setup = hspi_setup;
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master->transfer = hspi_transfer;
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master->cleanup = hspi_cleanup;
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master->mode_bits = SPI_CPOL | SPI_CPHA;
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master->prepare_transfer_hardware = hspi_prepare_transfer;
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master->transfer_one_message = hspi_transfer_one_message;
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master->unprepare_transfer_hardware = hspi_unprepare_transfer;
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ret = spi_register_master(master);
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if (ret < 0) {
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dev_err(&pdev->dev, "spi_register_master error.\n");
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goto error3;
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goto error2;
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}
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pm_runtime_enable(&pdev->dev);
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@ -325,8 +286,6 @@ static int __devinit hspi_probe(struct platform_device *pdev)
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return 0;
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error3:
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destroy_workqueue(hspi->workqueue);
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error2:
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devm_iounmap(hspi->dev, hspi->addr);
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error1:
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@ -342,7 +301,6 @@ static int __devexit hspi_remove(struct platform_device *pdev)
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pm_runtime_disable(&pdev->dev);
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spi_unregister_master(hspi->master);
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destroy_workqueue(hspi->workqueue);
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devm_iounmap(hspi->dev, hspi->addr);
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return 0;
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