spi: dw: migrate to generic queue infrastructure

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 15 insertions, 176 deletions

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;