diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 111 |
1 files changed, 34 insertions, 77 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index ccd5cf2..0e4d169 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -25,8 +25,6 @@ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/errno.h> -#include <linux/list.h> -#include <linux/workqueue.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/io.h> @@ -181,10 +179,7 @@ struct rspi_data { void __iomem *addr; u32 max_speed_hz; struct spi_master *master; - struct list_head queue; - struct work_struct ws; wait_queue_head_t wait; - spinlock_t lock; struct clk *clk; u8 spsr; u16 spcmd; @@ -345,16 +340,6 @@ static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask, return 0; } -static void rspi_assert_ssl(const struct rspi_data *rspi) -{ - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR); -} - -static void rspi_negate_ssl(const struct rspi_data *rspi) -{ - rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR); -} - static int rspi_send_pio(struct rspi_data *rspi, struct spi_transfer *t) { int remain = t->len; @@ -739,56 +724,27 @@ static int rspi_is_dma(const struct rspi_data *rspi, struct spi_transfer *t) return 0; } -static void rspi_work(struct work_struct *work) +static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi, + struct spi_transfer *xfer) { - struct rspi_data *rspi = container_of(work, struct rspi_data, ws); - struct spi_message *mesg; - struct spi_transfer *t; - unsigned long flags; - int ret; - - while (1) { - spin_lock_irqsave(&rspi->lock, flags); - if (list_empty(&rspi->queue)) { - spin_unlock_irqrestore(&rspi->lock, flags); - break; - } - mesg = list_entry(rspi->queue.next, struct spi_message, queue); - list_del_init(&mesg->queue); - spin_unlock_irqrestore(&rspi->lock, flags); - - rspi_assert_ssl(rspi); - - list_for_each_entry(t, &mesg->transfers, transfer_list) { - if (t->tx_buf) { - if (rspi_is_dma(rspi, t)) - ret = rspi_send_dma(rspi, t); - else - ret = send_pio(rspi, t); - if (ret < 0) - goto error; - } - if (t->rx_buf) { - if (rspi_is_dma(rspi, t)) - ret = rspi_receive_dma(rspi, t); - else - ret = receive_pio(rspi, t); - if (ret < 0) - goto error; - } - mesg->actual_length += t->len; - } - rspi_negate_ssl(rspi); + struct rspi_data *rspi = spi_master_get_devdata(master); + int ret = 0; - mesg->status = 0; - mesg->complete(mesg->context); + if (xfer->tx_buf) { + if (rspi_is_dma(rspi, xfer)) + ret = rspi_send_dma(rspi, xfer); + else + ret = send_pio(rspi, xfer); + if (ret < 0) + return ret; } - - return; - -error: - mesg->status = ret; - mesg->complete(mesg->context); + if (xfer->rx_buf) { + if (rspi_is_dma(rspi, xfer)) + ret = rspi_receive_dma(rspi, xfer); + else + ret = receive_pio(rspi, xfer); + } + return ret; } static int rspi_setup(struct spi_device *spi) @@ -808,24 +764,26 @@ static int rspi_setup(struct spi_device *spi) return 0; } -static int rspi_transfer(struct spi_device *spi, struct spi_message *mesg) +static void rspi_cleanup(struct spi_device *spi) { - struct rspi_data *rspi = spi_master_get_devdata(spi->master); - unsigned long flags; - - mesg->actual_length = 0; - mesg->status = -EINPROGRESS; +} - spin_lock_irqsave(&rspi->lock, flags); - list_add_tail(&mesg->queue, &rspi->queue); - schedule_work(&rspi->ws); - spin_unlock_irqrestore(&rspi->lock, flags); +static int rspi_prepare_message(struct spi_master *master, + struct spi_message *message) +{ + struct rspi_data *rspi = spi_master_get_devdata(master); + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR); return 0; } -static void rspi_cleanup(struct spi_device *spi) +static int rspi_unprepare_message(struct spi_master *master, + struct spi_message *message) { + struct rspi_data *rspi = spi_master_get_devdata(master); + + rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR); + return 0; } static irqreturn_t rspi_irq(int irq, void *_sr) @@ -972,9 +930,6 @@ static int rspi_probe(struct platform_device *pdev) } clk_enable(rspi->clk); - INIT_LIST_HEAD(&rspi->queue); - spin_lock_init(&rspi->lock); - INIT_WORK(&rspi->ws, rspi_work); init_waitqueue_head(&rspi->wait); if (rspi_pd && rspi_pd->num_chipselect) @@ -984,8 +939,10 @@ static int rspi_probe(struct platform_device *pdev) master->bus_num = pdev->id; master->setup = rspi_setup; - master->transfer = rspi_transfer; + master->transfer_one = rspi_transfer_one; master->cleanup = rspi_cleanup; + master->prepare_message = rspi_prepare_message; + master->unprepare_message = rspi_unprepare_message; master->mode_bits = SPI_CPHA | SPI_CPOL; ret = devm_request_irq(&pdev->dev, irq, rspi_irq, 0, |
