From: Baruch Siach Date: Fri, 31 Jan 2014 10:07:44 +0000 (+0200) Subject: spi: dw: migrate to generic queue infrastructure X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ec37e8e1f0e3;p=linux-beck.git spi: dw: migrate to generic queue infrastructure Signed-off-by: Baruch Siach Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 712ac5629cd4..357869a704d6 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -36,9 +36,6 @@ #define DONE_STATE ((void *)2) #define ERROR_STATE ((void *)-1) -#define QUEUE_RUNNING 0 -#define QUEUE_STOPPED 1 - #define MRST_SPI_DEASSERT 0 #define MRST_SPI_ASSERT 1 @@ -263,18 +260,14 @@ static int map_dma_buffers(struct dw_spi *dws) static void giveback(struct dw_spi *dws) { struct spi_transfer *last_transfer; - unsigned long flags; struct spi_message *msg; - spin_lock_irqsave(&dws->lock, flags); msg = dws->cur_msg; dws->cur_msg = NULL; dws->cur_transfer = NULL; dws->prev_chip = dws->cur_chip; dws->cur_chip = NULL; dws->dma_mapped = 0; - queue_work(dws->workqueue, &dws->pump_messages); - spin_unlock_irqrestore(&dws->lock, flags); last_transfer = list_last_entry(&msg->transfers, struct spi_transfer, transfer_list); @@ -282,9 +275,7 @@ static void giveback(struct dw_spi *dws) if (!last_transfer->cs_change && dws->cs_control) dws->cs_control(MRST_SPI_DEASSERT); - msg->state = NULL; - if (msg->complete) - msg->complete(msg->context); + spi_finalize_current_message(dws->master); } static void int_error_stop(struct dw_spi *dws, const char *msg) @@ -529,30 +520,12 @@ early_exit: return; } -static void pump_messages(struct work_struct *work) +static int dw_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) { - struct dw_spi *dws = - container_of(work, struct dw_spi, pump_messages); - unsigned long flags; - - /* Lock queue and check for queue work */ - spin_lock_irqsave(&dws->lock, flags); - if (list_empty(&dws->queue) || dws->run == QUEUE_STOPPED) { - dws->busy = 0; - spin_unlock_irqrestore(&dws->lock, flags); - return; - } - - /* Make sure we are not already running a message */ - if (dws->cur_msg) { - spin_unlock_irqrestore(&dws->lock, flags); - return; - } - - /* Extract head of queue */ - dws->cur_msg = list_entry(dws->queue.next, struct spi_message, queue); - list_del_init(&dws->cur_msg->queue); + struct dw_spi *dws = spi_master_get_devdata(master); + dws->cur_msg = msg; /* Initial message state*/ dws->cur_msg->state = START_STATE; dws->cur_transfer = list_entry(dws->cur_msg->transfers.next, @@ -560,46 +533,9 @@ static void pump_messages(struct work_struct *work) transfer_list); dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi); - /* Mark as busy and launch transfers */ + /* Launch transfers */ tasklet_schedule(&dws->pump_transfers); - dws->busy = 1; - spin_unlock_irqrestore(&dws->lock, flags); -} - -/* spi_device use this to queue in their spi_msg */ -static int dw_spi_transfer(struct spi_device *spi, struct spi_message *msg) -{ - struct dw_spi *dws = spi_master_get_devdata(spi->master); - unsigned long flags; - - spin_lock_irqsave(&dws->lock, flags); - - if (dws->run == QUEUE_STOPPED) { - spin_unlock_irqrestore(&dws->lock, flags); - return -ESHUTDOWN; - } - - msg->actual_length = 0; - msg->status = -EINPROGRESS; - msg->state = START_STATE; - - list_add_tail(&msg->queue, &dws->queue); - - if (dws->run == QUEUE_RUNNING && !dws->busy) { - - if (dws->cur_transfer || dws->cur_msg) - queue_work(dws->workqueue, - &dws->pump_messages); - else { - /* If no other data transaction in air, just go */ - spin_unlock_irqrestore(&dws->lock, flags); - pump_messages(&dws->pump_messages); - return 0; - } - } - - spin_unlock_irqrestore(&dws->lock, flags); return 0; } @@ -664,79 +600,10 @@ static int dw_spi_setup(struct spi_device *spi) return 0; } -static int init_queue(struct dw_spi *dws) -{ - INIT_LIST_HEAD(&dws->queue); - spin_lock_init(&dws->lock); - - dws->run = QUEUE_STOPPED; - dws->busy = 0; - - tasklet_init(&dws->pump_transfers, - pump_transfers, (unsigned long)dws); - - INIT_WORK(&dws->pump_messages, pump_messages); - dws->workqueue = create_singlethread_workqueue( - dev_name(dws->master->dev.parent)); - if (dws->workqueue == NULL) - return -EBUSY; - - return 0; -} - -static int start_queue(struct dw_spi *dws) +static void dw_spi_cleanup(struct spi_device *spi) { - unsigned long flags; - - spin_lock_irqsave(&dws->lock, flags); - - if (dws->run == QUEUE_RUNNING || dws->busy) { - spin_unlock_irqrestore(&dws->lock, flags); - return -EBUSY; - } - - dws->run = QUEUE_RUNNING; - dws->cur_msg = NULL; - dws->cur_transfer = NULL; - dws->cur_chip = NULL; - dws->prev_chip = NULL; - spin_unlock_irqrestore(&dws->lock, flags); - - queue_work(dws->workqueue, &dws->pump_messages); - - return 0; -} - -static int stop_queue(struct dw_spi *dws) -{ - unsigned long flags; - unsigned limit = 50; - int status = 0; - - spin_lock_irqsave(&dws->lock, flags); - dws->run = QUEUE_STOPPED; - while ((!list_empty(&dws->queue) || dws->busy) && limit--) { - spin_unlock_irqrestore(&dws->lock, flags); - msleep(10); - spin_lock_irqsave(&dws->lock, flags); - } - - if (!list_empty(&dws->queue) || dws->busy) - status = -EBUSY; - spin_unlock_irqrestore(&dws->lock, flags); - - return status; -} - -static int destroy_queue(struct dw_spi *dws) -{ - int status; - - status = stop_queue(dws); - if (status != 0) - return status; - destroy_workqueue(dws->workqueue); - return 0; + struct chip_data *chip = spi_get_ctldata(spi); + kfree(chip); } /* Restart the controller, disable all interrupts, clean rx fifo */ @@ -794,7 +661,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) master->bus_num = dws->bus_num; master->num_chipselect = dws->num_cs; master->setup = dw_spi_setup; - master->transfer = dw_spi_transfer; + master->transfer_one_message = dw_spi_transfer_one_message; master->max_speed_hz = dws->max_freq; /* Basic HW init */ @@ -808,33 +675,21 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) } } - /* Initial and start queue */ - ret = init_queue(dws); - if (ret) { - dev_err(&master->dev, "problem initializing queue\n"); - goto err_diable_hw; - } - ret = start_queue(dws); - if (ret) { - dev_err(&master->dev, "problem starting queue\n"); - goto err_diable_hw; - } + tasklet_init(&dws->pump_transfers, pump_transfers, (unsigned long)dws); spi_master_set_devdata(master, dws); ret = devm_spi_register_master(dev, master); if (ret) { dev_err(&master->dev, "problem registering spi master\n"); - goto err_queue_alloc; + goto err_dma_exit; } mrst_spi_debugfs_init(dws); return 0; -err_queue_alloc: - destroy_queue(dws); +err_dma_exit: if (dws->dma_ops && dws->dma_ops->dma_exit) dws->dma_ops->dma_exit(dws); -err_diable_hw: spi_enable_chip(dws, 0); err_free_master: spi_master_put(master); @@ -844,18 +699,10 @@ EXPORT_SYMBOL_GPL(dw_spi_add_host); void dw_spi_remove_host(struct dw_spi *dws) { - int status = 0; - if (!dws) return; mrst_spi_debugfs_remove(dws); - /* Remove the queue */ - status = destroy_queue(dws); - if (status != 0) - dev_err(&dws->master->dev, - "dw_spi_remove: workqueue will not complete, message memory not freed\n"); - if (dws->dma_ops && dws->dma_ops->dma_exit) dws->dma_ops->dma_exit(dws); spi_enable_chip(dws, 0); @@ -868,7 +715,7 @@ int dw_spi_suspend_host(struct dw_spi *dws) { int ret = 0; - ret = stop_queue(dws); + ret = spi_master_suspend(dws->master); if (ret) return ret; spi_enable_chip(dws, 0); @@ -882,7 +729,7 @@ int dw_spi_resume_host(struct dw_spi *dws) int ret; spi_hw_init(dws); - ret = start_queue(dws); + ret = spi_master_resume(dws->master); if (ret) dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret); return ret; diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 587643dae11e..3fd7ab599ab4 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -104,14 +104,6 @@ struct dw_spi { u16 bus_num; u16 num_cs; /* supported slave numbers */ - /* 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;