diff options
| -rw-r--r-- | drivers/spi/spi-sh-hspi.c | 152 |
1 files changed, 55 insertions, 97 deletions
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c index 8356ec8..4290673 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; |
