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spi/s3c64xx: Convert to using core message queue
Convert the s3c64xx driver to using the new message queue factored out of the pl022 driver by Linus Walleij, saving us a nice block of code and getting the benefits of improvements implemented in the core. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Mark Brown
Grant Likely
parent
5e8afa34cc
commit
ad2a99af0d
1 changed files with 22 additions and 103 deletions
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@ -128,8 +128,6 @@
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#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
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#define SUSPND (1<<0)
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#define SPIBUSY (1<<1)
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#define RXBUSY (1<<2)
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#define TXBUSY (1<<3)
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@ -144,10 +142,8 @@ struct s3c64xx_spi_dma_data {
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* @clk: Pointer to the spi clock.
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* @src_clk: Pointer to the clock used to generate SPI signals.
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* @master: Pointer to the SPI Protocol master.
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* @workqueue: Work queue for the SPI xfer requests.
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* @cntrlr_info: Platform specific data for the controller this driver manages.
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* @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
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* @work: Work
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* @queue: To log SPI xfer requests.
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* @lock: Controller specific lock.
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* @state: Set of FLAGS to indicate status.
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@ -167,10 +163,8 @@ struct s3c64xx_spi_driver_data {
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struct clk *src_clk;
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struct platform_device *pdev;
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struct spi_master *master;
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struct workqueue_struct *workqueue;
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struct s3c64xx_spi_info *cntrlr_info;
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struct spi_device *tgl_spi;
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struct work_struct work;
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struct list_head queue;
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spinlock_t lock;
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unsigned long sfr_start;
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@ -637,9 +631,10 @@ static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
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}
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}
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static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
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struct spi_message *msg)
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static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
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struct spi_message *msg)
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{
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
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struct spi_device *spi = msg->spi;
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struct s3c64xx_spi_csinfo *cs = spi->controller_data;
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@ -771,13 +766,15 @@ static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
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if (msg->complete)
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msg->complete(msg->context);
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spi_finalize_current_message(master);
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return 0;
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}
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static void s3c64xx_spi_work(struct work_struct *work)
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static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
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{
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struct s3c64xx_spi_driver_data *sdd = container_of(work,
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struct s3c64xx_spi_driver_data, work);
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unsigned long flags;
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
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/* Acquire DMA channels */
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while (!acquire_dma(sdd))
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@ -785,61 +782,18 @@ static void s3c64xx_spi_work(struct work_struct *work)
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pm_runtime_get_sync(&sdd->pdev->dev);
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spin_lock_irqsave(&sdd->lock, flags);
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return 0;
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}
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while (!list_empty(&sdd->queue)
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&& !(sdd->state & SUSPND)) {
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struct spi_message *msg;
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msg = container_of(sdd->queue.next, struct spi_message, queue);
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list_del_init(&msg->queue);
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/* Set Xfer busy flag */
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sdd->state |= SPIBUSY;
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spin_unlock_irqrestore(&sdd->lock, flags);
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handle_msg(sdd, msg);
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spin_lock_irqsave(&sdd->lock, flags);
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sdd->state &= ~SPIBUSY;
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}
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spin_unlock_irqrestore(&sdd->lock, flags);
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static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)
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{
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
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/* Free DMA channels */
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sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
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sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
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pm_runtime_put(&sdd->pdev->dev);
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}
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static int s3c64xx_spi_transfer(struct spi_device *spi,
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struct spi_message *msg)
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{
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struct s3c64xx_spi_driver_data *sdd;
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unsigned long flags;
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sdd = spi_master_get_devdata(spi->master);
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spin_lock_irqsave(&sdd->lock, flags);
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if (sdd->state & SUSPND) {
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spin_unlock_irqrestore(&sdd->lock, flags);
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return -ESHUTDOWN;
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}
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msg->status = -EINPROGRESS;
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msg->actual_length = 0;
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list_add_tail(&msg->queue, &sdd->queue);
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queue_work(sdd->workqueue, &sdd->work);
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spin_unlock_irqrestore(&sdd->lock, flags);
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return 0;
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}
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@ -879,13 +833,6 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
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}
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}
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if (sdd->state & SUSPND) {
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spin_unlock_irqrestore(&sdd->lock, flags);
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dev_err(&spi->dev,
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"setup: SPI-%d not active!\n", spi->master->bus_num);
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return -ESHUTDOWN;
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}
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spin_unlock_irqrestore(&sdd->lock, flags);
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if (spi->bits_per_word != 8
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@ -1073,7 +1020,9 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
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master->bus_num = pdev->id;
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master->setup = s3c64xx_spi_setup;
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master->transfer = s3c64xx_spi_transfer;
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master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
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master->transfer_one_message = s3c64xx_spi_transfer_one_message;
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master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
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master->num_chipselect = sci->num_cs;
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master->dma_alignment = 8;
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/* the spi->mode bits understood by this driver: */
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@ -1128,27 +1077,18 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
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goto err6;
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}
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sdd->workqueue = create_singlethread_workqueue(
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dev_name(master->dev.parent));
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if (sdd->workqueue == NULL) {
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dev_err(&pdev->dev, "Unable to create workqueue\n");
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ret = -ENOMEM;
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goto err7;
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}
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/* Setup Deufult Mode */
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s3c64xx_spi_hwinit(sdd, pdev->id);
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spin_lock_init(&sdd->lock);
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init_completion(&sdd->xfer_completion);
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INIT_WORK(&sdd->work, s3c64xx_spi_work);
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INIT_LIST_HEAD(&sdd->queue);
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ret = request_irq(irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd);
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if (ret != 0) {
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dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
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irq, ret);
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goto err8;
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goto err7;
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}
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writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
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@ -1158,7 +1098,7 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
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if (spi_register_master(master)) {
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dev_err(&pdev->dev, "cannot register SPI master\n");
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ret = -EBUSY;
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goto err9;
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goto err8;
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}
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dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d "
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@ -1172,10 +1112,8 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
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return 0;
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err9:
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free_irq(irq, sdd);
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err8:
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destroy_workqueue(sdd->workqueue);
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free_irq(irq, sdd);
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err7:
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clk_disable(sdd->src_clk);
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err6:
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@ -1201,25 +1139,15 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
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struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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struct resource *mem_res;
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unsigned long flags;
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pm_runtime_disable(&pdev->dev);
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spin_lock_irqsave(&sdd->lock, flags);
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sdd->state |= SUSPND;
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spin_unlock_irqrestore(&sdd->lock, flags);
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while (sdd->state & SPIBUSY)
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msleep(10);
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spi_unregister_master(master);
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writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
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free_irq(platform_get_irq(pdev, 0), sdd);
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destroy_workqueue(sdd->workqueue);
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clk_disable(sdd->src_clk);
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clk_put(sdd->src_clk);
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@ -1243,14 +1171,8 @@ static int s3c64xx_spi_suspend(struct device *dev)
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{
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struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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unsigned long flags;
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spin_lock_irqsave(&sdd->lock, flags);
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sdd->state |= SUSPND;
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spin_unlock_irqrestore(&sdd->lock, flags);
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while (sdd->state & SPIBUSY)
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msleep(10);
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spi_master_suspend(master);
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/* Disable the clock */
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clk_disable(sdd->src_clk);
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@ -1267,7 +1189,6 @@ static int s3c64xx_spi_resume(struct device *dev)
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struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
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unsigned long flags;
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sci->cfg_gpio(pdev);
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@ -1277,9 +1198,7 @@ static int s3c64xx_spi_resume(struct device *dev)
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s3c64xx_spi_hwinit(sdd, pdev->id);
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spin_lock_irqsave(&sdd->lock, flags);
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sdd->state &= ~SUSPND;
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spin_unlock_irqrestore(&sdd->lock, flags);
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spi_master_resume(master);
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return 0;
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}
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