summaryrefslogtreecommitdiff
path: root/drivers/spi
diff options
context:
space:
mode:
authorMarc Kleine-Budde <mkl@pengutronix.de>2022-05-02 20:54:55 +0300
committerMark Brown <broonie@kernel.org>2022-05-09 20:18:14 +0300
commit307c897db762d1e0feee9477276b08f6deca4a5b (patch)
tree4e58400ff17e6d8ce8e9461cc37c2bc8d467e1d5 /drivers/spi
parent63cd96b70f9366f67048fbc07294ce5823001ded (diff)
downloadlinux-307c897db762d1e0feee9477276b08f6deca4a5b.tar.xz
spi: spi-imx: replace struct spi_imx_data::bitbang by pointer to struct spi_controller
There's no need to embed the struct spi_bitbang into our private data (struct spi_imx_data), the spi core is flexible enough, so that we only need a pointer to the allocated struct spi_controller. This is also a preparation patch to add PIO based polling support to the driver. Co-developed-by: David Jander <david@protonic.nl> Signed-off-by: David Jander <david@protonic.nl> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Link: https://lore.kernel.org/r/20220502175457.1977983-8-mkl@pengutronix.de Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/Kconfig1
-rw-r--r--drivers/spi/spi-imx.c58
2 files changed, 29 insertions, 30 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 9f09aff3cca1..f56fa715d4e7 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -414,7 +414,6 @@ config SPI_IMG_SPFI
config SPI_IMX
tristate "Freescale i.MX SPI controllers"
depends on ARCH_MXC || COMPILE_TEST
- select SPI_BITBANG
help
This enables support for the Freescale i.MX SPI controllers.
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 9defc55707c7..894801ed182b 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -18,7 +18,6 @@
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
-#include <linux/spi/spi_bitbang.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -86,7 +85,7 @@ struct spi_imx_devtype_data {
};
struct spi_imx_data {
- struct spi_bitbang bitbang;
+ struct spi_controller *controller;
struct device *dev;
struct completion xfer_done;
@@ -580,7 +579,7 @@ static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx,
* the SPI communication as the device on the other end would consider
* the change of SCLK polarity as a clock tick already.
*
- * Because spi_imx->spi_bus_clk is only set in bitbang prepare_message
+ * Because spi_imx->spi_bus_clk is only set in prepare_message
* callback, iterate over all the transfers in spi_message, find the
* one with lowest bus frequency, and use that bus frequency for the
* delay calculation. In case all transfers have speed_hz == 0, then
@@ -1261,7 +1260,7 @@ static int spi_imx_setupxfer(struct spi_device *spi,
spi_imx->dynamic_burst = 0;
}
- if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
+ if (spi_imx_can_dma(spi_imx->controller, spi, t))
spi_imx->usedma = true;
else
spi_imx->usedma = false;
@@ -1282,7 +1281,7 @@ static int spi_imx_setupxfer(struct spi_device *spi,
static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
{
- struct spi_controller *controller = spi_imx->bitbang.master;
+ struct spi_controller *controller = spi_imx->controller;
if (controller->dma_rx) {
dma_release_channel(controller->dma_rx);
@@ -1324,7 +1323,7 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
init_completion(&spi_imx->dma_tx_completion);
controller->can_dma = spi_imx_can_dma;
controller->max_dma_len = MAX_SDMA_BD_BYTES;
- spi_imx->bitbang.master->flags = SPI_CONTROLLER_MUST_RX |
+ spi_imx->controller->flags = SPI_CONTROLLER_MUST_RX |
SPI_CONTROLLER_MUST_TX;
return 0;
@@ -1367,7 +1366,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
struct dma_async_tx_descriptor *desc_tx, *desc_rx;
unsigned long transfer_timeout;
unsigned long timeout;
- struct spi_controller *controller = spi_imx->bitbang.master;
+ struct spi_controller *controller = spi_imx->controller;
struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents);
unsigned int bytes_per_word, i;
@@ -1450,7 +1449,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
return -ETIMEDOUT;
}
- return transfer->len;
+ return 0;
/* fallback to pio */
dma_failure_no_start:
transfer->error |= SPI_TRANS_FAIL_NO_START;
@@ -1486,14 +1485,14 @@ static int spi_imx_pio_transfer(struct spi_device *spi,
return -ETIMEDOUT;
}
- return transfer->len;
+ return 0;
}
static int spi_imx_pio_transfer_slave(struct spi_device *spi,
struct spi_transfer *transfer)
{
struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
- int ret = transfer->len;
+ int ret = 0;
if (is_imx53_ecspi(spi_imx) &&
transfer->len > MX53_MAX_TRANSFER_BYTES) {
@@ -1533,11 +1532,13 @@ static int spi_imx_pio_transfer_slave(struct spi_device *spi,
return ret;
}
-static int spi_imx_transfer(struct spi_device *spi,
+static int spi_imx_transfer_one(struct spi_controller *controller,
+ struct spi_device *spi,
struct spi_transfer *transfer)
{
struct spi_imx_data *spi_imx = spi_controller_get_devdata(spi->controller);
+ spi_imx_setupxfer(spi, transfer);
transfer->effective_speed_hz = spi_imx->spi_bus_clk;
/* flush rxfifo before transfer */
@@ -1642,7 +1643,7 @@ static int spi_imx_probe(struct platform_device *pdev)
controller->use_gpio_descriptors = true;
spi_imx = spi_controller_get_devdata(controller);
- spi_imx->bitbang.master = controller;
+ spi_imx->controller = controller;
spi_imx->dev = &pdev->dev;
spi_imx->slave_mode = slave_mode;
@@ -1659,20 +1660,20 @@ static int spi_imx_probe(struct platform_device *pdev)
else
controller->num_chipselect = 3;
- spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
- spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
- spi_imx->bitbang.master->setup = spi_imx_setup;
- spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
- spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
- spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
- spi_imx->bitbang.master->slave_abort = spi_imx_slave_abort;
- spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
+ spi_imx->controller->transfer_one = spi_imx_transfer_one;
+ spi_imx->controller->setup = spi_imx_setup;
+ spi_imx->controller->cleanup = spi_imx_cleanup;
+ spi_imx->controller->prepare_message = spi_imx_prepare_message;
+ spi_imx->controller->unprepare_message = spi_imx_unprepare_message;
+ spi_imx->controller->slave_abort = spi_imx_slave_abort;
+ spi_imx->controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS;
+
if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||
is_imx53_ecspi(spi_imx))
- spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY;
+ spi_imx->controller->mode_bits |= SPI_LOOP | SPI_READY;
if (is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx))
- spi_imx->bitbang.master->mode_bits |= SPI_RX_CPHA_FLIP;
+ spi_imx->controller->mode_bits |= SPI_RX_CPHA_FLIP;
if (is_imx51_ecspi(spi_imx) &&
device_property_read_u32(&pdev->dev, "cs-gpios", NULL))
@@ -1681,7 +1682,7 @@ static int spi_imx_probe(struct platform_device *pdev)
* setting the burst length to the word size. This is
* considerably faster than manually controlling the CS.
*/
- spi_imx->bitbang.master->mode_bits |= SPI_CS_WORD;
+ spi_imx->controller->mode_bits |= SPI_CS_WORD;
spi_imx->spi_drctl = spi_drctl;
@@ -1754,10 +1755,10 @@ static int spi_imx_probe(struct platform_device *pdev)
spi_imx->devtype_data->intctrl(spi_imx, 0);
controller->dev.of_node = pdev->dev.of_node;
- ret = spi_bitbang_start(&spi_imx->bitbang);
+ ret = spi_register_controller(controller);
if (ret) {
- dev_err_probe(&pdev->dev, ret, "bitbang start failed\n");
- goto out_bitbang_start;
+ dev_err_probe(&pdev->dev, ret, "register controller failed\n");
+ goto out_register_controller;
}
pm_runtime_mark_last_busy(spi_imx->dev);
@@ -1765,7 +1766,7 @@ static int spi_imx_probe(struct platform_device *pdev)
return ret;
-out_bitbang_start:
+out_register_controller:
if (spi_imx->devtype_data->has_dmamode)
spi_imx_sdma_exit(spi_imx);
out_runtime_pm_put:
@@ -1788,7 +1789,7 @@ static int spi_imx_remove(struct platform_device *pdev)
struct spi_imx_data *spi_imx = spi_controller_get_devdata(controller);
int ret;
- spi_bitbang_stop(&spi_imx->bitbang);
+ spi_unregister_controller(controller);
ret = pm_runtime_resume_and_get(spi_imx->dev);
if (ret < 0) {
@@ -1803,7 +1804,6 @@ static int spi_imx_remove(struct platform_device *pdev)
pm_runtime_disable(spi_imx->dev);
spi_imx_sdma_exit(spi_imx);
- spi_controller_put(controller);
return 0;
}