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-rw-r--r--drivers/spi/spi-omap2-mcspi.c243
1 files changed, 110 insertions, 133 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index f374eeebb8c2..46ef5fe51db5 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -120,10 +120,6 @@ struct omap2_mcspi_regs {
};
struct omap2_mcspi {
- struct work_struct work;
- /* lock protects queue and registers */
- spinlock_t lock;
- struct list_head msg_queue;
struct spi_master *master;
/* Virtual base address of the controller */
void __iomem *base;
@@ -131,7 +127,6 @@ struct omap2_mcspi {
/* SPI1 has 4 channels, while SPI2 has 2 */
struct omap2_mcspi_dma *dma_channels;
struct device *dev;
- struct workqueue_struct *wq;
struct omap2_mcspi_regs ctx;
};
@@ -275,6 +270,23 @@ static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
return pm_runtime_get_sync(mcspi->dev);
}
+static int omap2_prepare_transfer(struct spi_master *master)
+{
+ struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
+
+ pm_runtime_get_sync(mcspi->dev);
+ return 0;
+}
+
+static int omap2_unprepare_transfer(struct spi_master *master)
+{
+ struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
+
+ pm_runtime_mark_last_busy(mcspi->dev);
+ pm_runtime_put_autosuspend(mcspi->dev);
+ return 0;
+}
+
static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
{
unsigned long timeout;
@@ -846,144 +858,122 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
}
}
-static void omap2_mcspi_work(struct work_struct *work)
+static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
{
- struct omap2_mcspi *mcspi;
-
- mcspi = container_of(work, struct omap2_mcspi, work);
-
- if (omap2_mcspi_enable_clocks(mcspi) < 0)
- return;
-
- spin_lock_irq(&mcspi->lock);
/* We only enable one channel at a time -- the one whose message is
- * at the head of the queue -- although this controller would gladly
+ * -- although this controller would gladly
* arbitrate among multiple channels. This corresponds to "single
* channel" master mode. As a side effect, we need to manage the
* chipselect with the FORCE bit ... CS != channel enable.
*/
- while (!list_empty(&mcspi->msg_queue)) {
- struct spi_message *m;
- struct spi_device *spi;
- struct spi_transfer *t = NULL;
- int cs_active = 0;
- struct omap2_mcspi_cs *cs;
- struct omap2_mcspi_device_config *cd;
- int par_override = 0;
- int status = 0;
- u32 chconf;
-
- m = container_of(mcspi->msg_queue.next, struct spi_message,
- queue);
-
- list_del_init(&m->queue);
- spin_unlock_irq(&mcspi->lock);
-
- spi = m->spi;
- cs = spi->controller_state;
- cd = spi->controller_data;
- omap2_mcspi_set_enable(spi, 1);
- list_for_each_entry(t, &m->transfers, transfer_list) {
- if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
- status = -EINVAL;
- break;
- }
- if (par_override || t->speed_hz || t->bits_per_word) {
- par_override = 1;
- status = omap2_mcspi_setup_transfer(spi, t);
- if (status < 0)
- break;
- if (!t->speed_hz && !t->bits_per_word)
- par_override = 0;
- }
+ struct spi_device *spi;
+ struct spi_transfer *t = NULL;
+ int cs_active = 0;
+ struct omap2_mcspi_cs *cs;
+ struct omap2_mcspi_device_config *cd;
+ int par_override = 0;
+ int status = 0;
+ u32 chconf;
- if (!cs_active) {
- omap2_mcspi_force_cs(spi, 1);
- cs_active = 1;
- }
+ spi = m->spi;
+ cs = spi->controller_state;
+ cd = spi->controller_data;
- chconf = mcspi_cached_chconf0(spi);
- chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
- chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
+ omap2_mcspi_set_enable(spi, 1);
+ list_for_each_entry(t, &m->transfers, transfer_list) {
+ if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
+ status = -EINVAL;
+ break;
+ }
+ if (par_override || t->speed_hz || t->bits_per_word) {
+ par_override = 1;
+ status = omap2_mcspi_setup_transfer(spi, t);
+ if (status < 0)
+ break;
+ if (!t->speed_hz && !t->bits_per_word)
+ par_override = 0;
+ }
- if (t->tx_buf == NULL)
- chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
- else if (t->rx_buf == NULL)
- chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
-
- if (cd && cd->turbo_mode && t->tx_buf == NULL) {
- /* Turbo mode is for more than one word */
- if (t->len > ((cs->word_len + 7) >> 3))
- chconf |= OMAP2_MCSPI_CHCONF_TURBO;
- }
+ if (!cs_active) {
+ omap2_mcspi_force_cs(spi, 1);
+ cs_active = 1;
+ }
- mcspi_write_chconf0(spi, chconf);
+ chconf = mcspi_cached_chconf0(spi);
+ chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
+ chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
- if (t->len) {
- unsigned count;
+ if (t->tx_buf == NULL)
+ chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
+ else if (t->rx_buf == NULL)
+ chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
- /* RX_ONLY mode needs dummy data in TX reg */
- if (t->tx_buf == NULL)
- __raw_writel(0, cs->base
- + OMAP2_MCSPI_TX0);
+ if (cd && cd->turbo_mode && t->tx_buf == NULL) {
+ /* Turbo mode is for more than one word */
+ if (t->len > ((cs->word_len + 7) >> 3))
+ chconf |= OMAP2_MCSPI_CHCONF_TURBO;
+ }
- if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
- count = omap2_mcspi_txrx_dma(spi, t);
- else
- count = omap2_mcspi_txrx_pio(spi, t);
- m->actual_length += count;
+ mcspi_write_chconf0(spi, chconf);
- if (count != t->len) {
- status = -EIO;
- break;
- }
- }
+ if (t->len) {
+ unsigned count;
+
+ /* RX_ONLY mode needs dummy data in TX reg */
+ if (t->tx_buf == NULL)
+ __raw_writel(0, cs->base
+ + OMAP2_MCSPI_TX0);
- if (t->delay_usecs)
- udelay(t->delay_usecs);
+ if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
+ count = omap2_mcspi_txrx_dma(spi, t);
+ else
+ count = omap2_mcspi_txrx_pio(spi, t);
+ m->actual_length += count;
- /* ignore the "leave it on after last xfer" hint */
- if (t->cs_change) {
- omap2_mcspi_force_cs(spi, 0);
- cs_active = 0;
+ if (count != t->len) {
+ status = -EIO;
+ break;
}
}
- /* Restore defaults if they were overriden */
- if (par_override) {
- par_override = 0;
- status = omap2_mcspi_setup_transfer(spi, NULL);
- }
+ if (t->delay_usecs)
+ udelay(t->delay_usecs);
- if (cs_active)
+ /* ignore the "leave it on after last xfer" hint */
+ if (t->cs_change) {
omap2_mcspi_force_cs(spi, 0);
+ cs_active = 0;
+ }
+ }
+ /* Restore defaults if they were overriden */
+ if (par_override) {
+ par_override = 0;
+ status = omap2_mcspi_setup_transfer(spi, NULL);
+ }
- omap2_mcspi_set_enable(spi, 0);
-
- m->status = status;
- m->complete(m->context);
+ if (cs_active)
+ omap2_mcspi_force_cs(spi, 0);
- spin_lock_irq(&mcspi->lock);
- }
+ omap2_mcspi_set_enable(spi, 0);
- spin_unlock_irq(&mcspi->lock);
+ m->status = status;
- omap2_mcspi_disable_clocks(mcspi);
}
-static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
+static int omap2_mcspi_transfer_one_message(struct spi_master *master,
+ struct spi_message *m)
{
struct omap2_mcspi *mcspi;
- unsigned long flags;
struct spi_transfer *t;
+ mcspi = spi_master_get_devdata(master);
m->actual_length = 0;
m->status = 0;
/* reject invalid messages and transfers */
- if (list_empty(&m->transfers) || !m->complete)
+ if (list_empty(&m->transfers))
return -EINVAL;
list_for_each_entry(t, &m->transfers, transfer_list) {
const void *tx_buf = t->tx_buf;
@@ -995,7 +985,7 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
|| (t->bits_per_word &&
( t->bits_per_word < 4
|| t->bits_per_word > 32))) {
- dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
+ dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
t->speed_hz,
len,
tx_buf ? "tx" : "",
@@ -1004,7 +994,7 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
return -EINVAL;
}
if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
- dev_dbg(&spi->dev, "speed_hz %d below minimum %d Hz\n",
+ dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n",
t->speed_hz,
OMAP2_MCSPI_MAX_FREQ >> 15);
return -EINVAL;
@@ -1014,35 +1004,30 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
continue;
if (tx_buf != NULL) {
- t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf,
+ t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
len, DMA_TO_DEVICE);
- if (dma_mapping_error(&spi->dev, t->tx_dma)) {
- dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
+ if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
+ dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'T', len);
return -EINVAL;
}
}
if (rx_buf != NULL) {
- t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len,
+ t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
DMA_FROM_DEVICE);
- if (dma_mapping_error(&spi->dev, t->rx_dma)) {
- dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
+ if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
+ dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'R', len);
if (tx_buf != NULL)
- dma_unmap_single(&spi->dev, t->tx_dma,
+ dma_unmap_single(mcspi->dev, t->tx_dma,
len, DMA_TO_DEVICE);
return -EINVAL;
}
}
}
- mcspi = spi_master_get_devdata(spi->master);
-
- spin_lock_irqsave(&mcspi->lock, flags);
- list_add_tail(&m->queue, &mcspi->msg_queue);
- queue_work(mcspi->wq, &mcspi->work);
- spin_unlock_irqrestore(&mcspi->lock, flags);
-
+ omap2_mcspi_work(mcspi, m);
+ spi_finalize_current_message(master);
return 0;
}
@@ -1120,7 +1105,9 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->setup = omap2_mcspi_setup;
- master->transfer = omap2_mcspi_transfer;
+ master->prepare_transfer_hardware = omap2_prepare_transfer;
+ master->unprepare_transfer_hardware = omap2_unprepare_transfer;
+ master->transfer_one_message = omap2_mcspi_transfer_one_message;
master->cleanup = omap2_mcspi_cleanup;
master->dev.of_node = node;
@@ -1145,12 +1132,6 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
mcspi = spi_master_get_devdata(master);
mcspi->master = master;
- mcspi->wq = alloc_workqueue(dev_name(&pdev->dev), WQ_MEM_RECLAIM, 1);
- if (mcspi->wq == NULL) {
- status = -ENOMEM;
- goto free_master;
- }
-
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
status = -ENODEV;
@@ -1169,10 +1150,7 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
}
mcspi->dev = &pdev->dev;
- INIT_WORK(&mcspi->work, omap2_mcspi_work);
- spin_lock_init(&mcspi->lock);
- INIT_LIST_HEAD(&mcspi->msg_queue);
INIT_LIST_HEAD(&mcspi->ctx.cs);
mcspi->dma_channels = kcalloc(master->num_chipselect,
@@ -1253,7 +1231,6 @@ static int __devexit omap2_mcspi_remove(struct platform_device *pdev)
spi_unregister_master(master);
kfree(dma_channels);
- destroy_workqueue(mcspi->wq);
platform_set_drvdata(pdev, NULL);
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 05:11:53 +0000