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spi: dw: migrate to generic queue infrastructure 

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Mark Brown <broonie@linaro.org>
hifive-unleashed-5.1
Baruch Siach 2014-01-31 12:07:44 +02:00 committed by Mark Brown
parent c9eaa447e7
commit ec37e8e1f0
2 changed files with 15 additions and 176 deletions
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183
drivers/spi/spi-dw.c
View File

@ -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)
static void dw_spi_cleanup(struct spi_device *spi)
{
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)
{
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;

8
drivers/spi/spi-dw.h
View File

@ -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;