diff options
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 212 |
1 files changed, 12 insertions, 200 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index ef0a78650e96..a241891355db 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -85,9 +85,6 @@ DEFINE_SSP_REG(SSPSP, 0x2c) #define DONE_STATE ((void*)2) #define ERROR_STATE ((void*)-1) -#define QUEUE_RUNNING 0 -#define QUEUE_STOPPED 1 - struct driver_data { /* Driver model hookup */ struct platform_device *pdev; @@ -117,14 +114,6 @@ struct driver_data { u32 clear_sr; u32 mask_sr; - /* Driver message queue */ - struct workqueue_struct *workqueue; - struct work_struct pump_messages; - spinlock_t lock; - struct list_head queue; - int busy; - int run; - /* Message Transfer pump */ struct tasklet_struct pump_transfers; @@ -173,8 +162,6 @@ struct chip_data { void (*cs_control)(u32 command); }; -static void pump_messages(struct work_struct *work); - static void cs_assert(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; @@ -444,15 +431,11 @@ static void unmap_dma_buffers(struct driver_data *drv_data) static void giveback(struct driver_data *drv_data) { struct spi_transfer* last_transfer; - unsigned long flags; struct spi_message *msg; - spin_lock_irqsave(&drv_data->lock, flags); msg = drv_data->cur_msg; drv_data->cur_msg = NULL; drv_data->cur_transfer = NULL; - queue_work(drv_data->workqueue, &drv_data->pump_messages); - spin_unlock_irqrestore(&drv_data->lock, flags); last_transfer = list_entry(msg->transfers.prev, struct spi_transfer, @@ -481,13 +464,7 @@ static void giveback(struct driver_data *drv_data) */ /* get a pointer to the next message, if any */ - spin_lock_irqsave(&drv_data->lock, flags); - if (list_empty(&drv_data->queue)) - next_msg = NULL; - else - next_msg = list_entry(drv_data->queue.next, - struct spi_message, queue); - spin_unlock_irqrestore(&drv_data->lock, flags); + next_msg = spi_get_next_queued_message(drv_data->master); /* see if the next and current messages point * to the same chip @@ -498,10 +475,7 @@ static void giveback(struct driver_data *drv_data) cs_deassert(drv_data); } - msg->state = NULL; - if (msg->complete) - msg->complete(msg->context); - + spi_finalize_current_message(drv_data->master); drv_data->cur_chip = NULL; } @@ -1176,31 +1150,12 @@ static void pump_transfers(unsigned long data) write_SSCR1(cr1, reg); } -static void pump_messages(struct work_struct *work) +static int pxa2xx_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) { - struct driver_data *drv_data = - container_of(work, struct driver_data, pump_messages); - unsigned long flags; - - /* Lock queue and check for queue work */ - spin_lock_irqsave(&drv_data->lock, flags); - if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) { - drv_data->busy = 0; - spin_unlock_irqrestore(&drv_data->lock, flags); - return; - } - - /* Make sure we are not already running a message */ - if (drv_data->cur_msg) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return; - } - - /* Extract head of queue */ - drv_data->cur_msg = list_entry(drv_data->queue.next, - struct spi_message, queue); - list_del_init(&drv_data->cur_msg->queue); + struct driver_data *drv_data = spi_master_get_devdata(master); + drv_data->cur_msg = msg; /* Initial message state*/ drv_data->cur_msg->state = START_STATE; drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, @@ -1213,34 +1168,6 @@ static void pump_messages(struct work_struct *work) /* Mark as busy and launch transfers */ tasklet_schedule(&drv_data->pump_transfers); - - drv_data->busy = 1; - spin_unlock_irqrestore(&drv_data->lock, flags); -} - -static int transfer(struct spi_device *spi, struct spi_message *msg) -{ - struct driver_data *drv_data = spi_master_get_devdata(spi->master); - unsigned long flags; - - spin_lock_irqsave(&drv_data->lock, flags); - - if (drv_data->run == QUEUE_STOPPED) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return -ESHUTDOWN; - } - - msg->actual_length = 0; - msg->status = -EINPROGRESS; - msg->state = START_STATE; - - list_add_tail(&msg->queue, &drv_data->queue); - - if (drv_data->run == QUEUE_RUNNING && !drv_data->busy) - queue_work(drv_data->workqueue, &drv_data->pump_messages); - - spin_unlock_irqrestore(&drv_data->lock, flags); - return 0; } @@ -1438,94 +1365,6 @@ static void cleanup(struct spi_device *spi) kfree(chip); } -static int init_queue(struct driver_data *drv_data) -{ - INIT_LIST_HEAD(&drv_data->queue); - spin_lock_init(&drv_data->lock); - - drv_data->run = QUEUE_STOPPED; - drv_data->busy = 0; - - tasklet_init(&drv_data->pump_transfers, - pump_transfers, (unsigned long)drv_data); - - INIT_WORK(&drv_data->pump_messages, pump_messages); - drv_data->workqueue = create_singlethread_workqueue( - dev_name(drv_data->master->dev.parent)); - if (drv_data->workqueue == NULL) - return -EBUSY; - - return 0; -} - -static int start_queue(struct driver_data *drv_data) -{ - unsigned long flags; - - spin_lock_irqsave(&drv_data->lock, flags); - - if (drv_data->run == QUEUE_RUNNING || drv_data->busy) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return -EBUSY; - } - - drv_data->run = QUEUE_RUNNING; - drv_data->cur_msg = NULL; - drv_data->cur_transfer = NULL; - drv_data->cur_chip = NULL; - spin_unlock_irqrestore(&drv_data->lock, flags); - - queue_work(drv_data->workqueue, &drv_data->pump_messages); - - return 0; -} - -static int stop_queue(struct driver_data *drv_data) -{ - unsigned long flags; - unsigned limit = 500; - int status = 0; - - spin_lock_irqsave(&drv_data->lock, flags); - - /* This is a bit lame, but is optimized for the common execution path. - * A wait_queue on the drv_data->busy could be used, but then the common - * execution path (pump_messages) would be required to call wake_up or - * friends on every SPI message. Do this instead */ - drv_data->run = QUEUE_STOPPED; - while ((!list_empty(&drv_data->queue) || drv_data->busy) && limit--) { - spin_unlock_irqrestore(&drv_data->lock, flags); - msleep(10); - spin_lock_irqsave(&drv_data->lock, flags); - } - - if (!list_empty(&drv_data->queue) || drv_data->busy) - status = -EBUSY; - - spin_unlock_irqrestore(&drv_data->lock, flags); - - return status; -} - -static int destroy_queue(struct driver_data *drv_data) -{ - int status; - - status = stop_queue(drv_data); - /* we are unloading the module or failing to load (only two calls - * to this routine), and neither call can handle a return value. - * However, destroy_workqueue calls flush_workqueue, and that will - * block until all work is done. If the reason that stop_queue - * timed out is that the work will never finish, then it does no - * good to call destroy_workqueue, so return anyway. */ - if (status != 0) - return status; - - destroy_workqueue(drv_data->workqueue); - - return 0; -} - static int pxa2xx_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1573,7 +1412,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) master->dma_alignment = DMA_ALIGNMENT; master->cleanup = cleanup; master->setup = setup; - master->transfer = transfer; + master->transfer_one_message = pxa2xx_spi_transfer_one_message; drv_data->ssp_type = ssp->type; drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT); @@ -1646,31 +1485,19 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) write_SSTO(0, drv_data->ioaddr); write_SSPSP(0, drv_data->ioaddr); - /* Initial and start queue */ - status = init_queue(drv_data); - if (status != 0) { - dev_err(&pdev->dev, "problem initializing queue\n"); - goto out_error_clock_enabled; - } - status = start_queue(drv_data); - if (status != 0) { - dev_err(&pdev->dev, "problem starting queue\n"); - goto out_error_clock_enabled; - } + tasklet_init(&drv_data->pump_transfers, pump_transfers, + (unsigned long)drv_data); /* Register with the SPI framework */ platform_set_drvdata(pdev, drv_data); status = spi_register_master(master); if (status != 0) { dev_err(&pdev->dev, "problem registering spi master\n"); - goto out_error_queue_alloc; + goto out_error_clock_enabled; } return status; -out_error_queue_alloc: - destroy_queue(drv_data); - out_error_clock_enabled: clk_disable(ssp->clk); @@ -1693,26 +1520,11 @@ static int pxa2xx_spi_remove(struct platform_device *pdev) { struct driver_data *drv_data = platform_get_drvdata(pdev); struct ssp_device *ssp; - int status = 0; if (!drv_data) return 0; ssp = drv_data->ssp; - /* Remove the queue */ - status = destroy_queue(drv_data); - if (status != 0) - /* the kernel does not check the return status of this - * this routine (mod->exit, within the kernel). Therefore - * nothing is gained by returning from here, the module is - * going away regardless, and we should not leave any more - * resources allocated than necessary. We cannot free the - * message memory in drv_data->queue, but we can release the - * resources below. I think the kernel should honor -EBUSY - * returns but... */ - dev_err(&pdev->dev, "pxa2xx_spi_remove: workqueue will not " - "complete, message memory not freed\n"); - /* Disable the SSP at the peripheral and SOC level */ write_SSCR0(0, drv_data->ioaddr); clk_disable(ssp->clk); @@ -1755,7 +1567,7 @@ static int pxa2xx_spi_suspend(struct device *dev) struct ssp_device *ssp = drv_data->ssp; int status = 0; - status = stop_queue(drv_data); + status = spi_master_suspend(drv_data->master); if (status != 0) return status; write_SSCR0(0, drv_data->ioaddr); @@ -1781,7 +1593,7 @@ static int pxa2xx_spi_resume(struct device *dev) clk_enable(ssp->clk); /* Start the queue running */ - status = start_queue(drv_data); + status = spi_master_resume(drv_data->master); if (status != 0) { dev_err(dev, "problem starting queue (%d)\n", status); return status; |