summaryrefslogtreecommitdiff
path: root/drivers/spi
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-sun4i.c8
-rw-r--r--drivers/spi/spi-sun6i.c7
-rw-r--r--drivers/spi/spi-ti-qspi.c2
-rw-r--r--drivers/spi/spi-topcliff-pch.c26
-rw-r--r--drivers/spi/spi-txx9.c11
-rw-r--r--drivers/spi/spidev.c41
6 files changed, 62 insertions, 33 deletions
diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index cf007f3b83ec..4969dc10684a 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -167,6 +167,11 @@ static void sun4i_spi_set_cs(struct spi_device *spi, bool enable)
sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
}
+static size_t sun4i_spi_max_transfer_size(struct spi_device *spi)
+{
+ return SUN4I_FIFO_DEPTH - 1;
+}
+
static int sun4i_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr)
@@ -402,6 +407,8 @@ static int sun4i_spi_probe(struct platform_device *pdev)
}
sspi->master = master;
+ master->max_speed_hz = 100 * 1000 * 1000;
+ master->min_speed_hz = 3 * 1000;
master->set_cs = sun4i_spi_set_cs;
master->transfer_one = sun4i_spi_transfer_one;
master->num_chipselect = 4;
@@ -409,6 +416,7 @@ static int sun4i_spi_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;
+ master->max_transfer_size = sun4i_spi_max_transfer_size;
sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(sspi->hclk)) {
diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index 7fce79a60608..9918a57a6a6e 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -153,6 +153,10 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg);
}
+static size_t sun6i_spi_max_transfer_size(struct spi_device *spi)
+{
+ return SUN6I_FIFO_DEPTH - 1;
+}
static int sun6i_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
@@ -394,6 +398,8 @@ static int sun6i_spi_probe(struct platform_device *pdev)
}
sspi->master = master;
+ master->max_speed_hz = 100 * 1000 * 1000;
+ master->min_speed_hz = 3 * 1000;
master->set_cs = sun6i_spi_set_cs;
master->transfer_one = sun6i_spi_transfer_one;
master->num_chipselect = 4;
@@ -401,6 +407,7 @@ static int sun6i_spi_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;
+ master->max_transfer_size = sun6i_spi_max_transfer_size;
sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(sspi->hclk)) {
diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index 29ea8d2f9824..ac0b072815a3 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -141,7 +141,7 @@ static int ti_qspi_setup(struct spi_device *spi)
u32 clk_ctrl_reg, clk_rate, clk_mask;
if (spi->master->busy) {
- dev_dbg(qspi->dev, "master busy doing other trasnfers\n");
+ dev_dbg(qspi->dev, "master busy doing other transfers\n");
return -EBUSY;
}
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index 93dfcee0f987..c54ee6674471 100644
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -133,8 +133,6 @@ struct pch_spi_dma_ctrl {
* @io_remap_addr: The remapped PCI base address
* @master: Pointer to the SPI master structure
* @work: Reference to work queue handler
- * @wk: Workqueue for carrying out execution of the
- * requests
* @wait: Wait queue for waking up upon receiving an
* interrupt.
* @transfer_complete: Status of SPI Transfer
@@ -169,7 +167,6 @@ struct pch_spi_data {
unsigned long io_base_addr;
struct spi_master *master;
struct work_struct work;
- struct workqueue_struct *wk;
wait_queue_head_t wait;
u8 transfer_complete;
u8 bcurrent_msg_processing;
@@ -517,8 +514,7 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
- /* schedule work queue to run */
- queue_work(data->wk, &data->work);
+ schedule_work(&data->work);
dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
retval = 0;
@@ -674,7 +670,7 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data)
*more messages)
*/
dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
- queue_work(data->wk, &data->work);
+ schedule_work(&data->work);
} else if (data->board_dat->suspend_sts ||
data->status == STATUS_EXITING) {
dev_dbg(&data->master->dev,
@@ -1266,14 +1262,7 @@ static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
{
dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
- /* free workqueue */
- if (data->wk != NULL) {
- destroy_workqueue(data->wk);
- data->wk = NULL;
- dev_dbg(&board_dat->pdev->dev,
- "%s destroy_workqueue invoked successfully\n",
- __func__);
- }
+ flush_work(&data->work);
}
static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
@@ -1283,14 +1272,6 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
- /* create workqueue */
- data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
- if (!data->wk) {
- dev_err(&board_dat->pdev->dev,
- "%s create_singlet hread_workqueue failed\n", __func__);
- retval = -EBUSY;
- goto err_return;
- }
/* reset PCH SPI h/w */
pch_spi_reset(data->master);
@@ -1299,7 +1280,6 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
-err_return:
if (retval != 0) {
dev_err(&board_dat->pdev->dev,
"%s FAIL:invoking pch_spi_free_resources\n", __func__);
diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c
index d69f8f8f3fa6..7492ea346b43 100644
--- a/drivers/spi/spi-txx9.c
+++ b/drivers/spi/spi-txx9.c
@@ -72,7 +72,6 @@
struct txx9spi {
- struct workqueue_struct *workqueue;
struct work_struct work;
spinlock_t lock; /* protect 'queue' */
struct list_head queue;
@@ -315,7 +314,7 @@ static int txx9spi_transfer(struct spi_device *spi, struct spi_message *m)
spin_lock_irqsave(&c->lock, flags);
list_add_tail(&m->queue, &c->queue);
- queue_work(c->workqueue, &c->work);
+ schedule_work(&c->work);
spin_unlock_irqrestore(&c->lock, flags);
return 0;
@@ -374,10 +373,6 @@ static int txx9spi_probe(struct platform_device *dev)
if (ret)
goto exit;
- c->workqueue = create_singlethread_workqueue(
- dev_name(master->dev.parent));
- if (!c->workqueue)
- goto exit_busy;
c->last_chipselect = -1;
dev_info(&dev->dev, "at %#llx, irq %d, %dMHz\n",
@@ -400,8 +395,6 @@ static int txx9spi_probe(struct platform_device *dev)
exit_busy:
ret = -EBUSY;
exit:
- if (c->workqueue)
- destroy_workqueue(c->workqueue);
clk_disable(c->clk);
spi_master_put(master);
return ret;
@@ -412,7 +405,7 @@ static int txx9spi_remove(struct platform_device *dev)
struct spi_master *master = platform_get_drvdata(dev);
struct txx9spi *c = spi_master_get_devdata(master);
- destroy_workqueue(c->workqueue);
+ flush_work(&c->work);
clk_disable(c->clk);
return 0;
}
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3c19f30f591..2e05046f866b 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -29,6 +29,7 @@
#include <linux/compat.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/acpi.h>
#include <linux/spi/spi.h>
#include <linux/spi/spidev.h>
@@ -700,6 +701,43 @@ static const struct of_device_id spidev_dt_ids[] = {
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
#endif
+#ifdef CONFIG_ACPI
+
+/* Dummy SPI devices not to be used in production systems */
+#define SPIDEV_ACPI_DUMMY 1
+
+static const struct acpi_device_id spidev_acpi_ids[] = {
+ /*
+ * The ACPI SPT000* devices are only meant for development and
+ * testing. Systems used in production should have a proper ACPI
+ * description of the connected peripheral and they should also use
+ * a proper driver instead of poking directly to the SPI bus.
+ */
+ { "SPT0001", SPIDEV_ACPI_DUMMY },
+ { "SPT0002", SPIDEV_ACPI_DUMMY },
+ { "SPT0003", SPIDEV_ACPI_DUMMY },
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, spidev_acpi_ids);
+
+static void spidev_probe_acpi(struct spi_device *spi)
+{
+ const struct acpi_device_id *id;
+
+ if (!has_acpi_companion(&spi->dev))
+ return;
+
+ id = acpi_match_device(spidev_acpi_ids, &spi->dev);
+ if (WARN_ON(!id))
+ return;
+
+ if (id->driver_data == SPIDEV_ACPI_DUMMY)
+ dev_warn(&spi->dev, "do not use this driver in production systems!\n");
+}
+#else
+static inline void spidev_probe_acpi(struct spi_device *spi) {}
+#endif
+
/*-------------------------------------------------------------------------*/
static int spidev_probe(struct spi_device *spi)
@@ -719,6 +757,8 @@ static int spidev_probe(struct spi_device *spi)
!of_match_device(spidev_dt_ids, &spi->dev));
}
+ spidev_probe_acpi(spi);
+
/* Allocate driver data */
spidev = kzalloc(sizeof(*spidev), GFP_KERNEL);
if (!spidev)
@@ -789,6 +829,7 @@ static struct spi_driver spidev_spi_driver = {
.driver = {
.name = "spidev",
.of_match_table = of_match_ptr(spidev_dt_ids),
+ .acpi_match_table = ACPI_PTR(spidev_acpi_ids),
},
.probe = spidev_probe,
.remove = spidev_remove,
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-26 02:34:11 +0000