summaryrefslogtreecommitdiff
path: root/drivers/spi/spi-s3c64xx.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
-rw-r--r--drivers/spi/spi-s3c64xx.c123
1 files changed, 89 insertions, 34 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index c26440e9058d..7f346866614a 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -18,7 +18,7 @@
#include <linux/platform_data/spi-s3c64xx.h>
-#define MAX_SPI_PORTS 6
+#define MAX_SPI_PORTS 12
#define S3C64XX_SPI_QUIRK_POLL (1 << 0)
#define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1)
#define AUTOSUSPEND_TIMEOUT 2000
@@ -59,6 +59,7 @@
#define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17)
#define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17)
#define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17)
+#define S3C64XX_SPI_MODE_SELF_LOOPBACK (1<<3)
#define S3C64XX_SPI_MODE_RXDMA_ON (1<<2)
#define S3C64XX_SPI_MODE_TXDMA_ON (1<<1)
#define S3C64XX_SPI_MODE_4BURST (1<<0)
@@ -130,11 +131,13 @@ struct s3c64xx_spi_dma_data {
* @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register.
* @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter.
* @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter.
+ * @clk_div: Internal clock divider
* @quirks: Bitmask of known quirks
* @high_speed: True, if the controller supports HIGH_SPEED_EN bit.
* @clk_from_cmu: True, if the controller does not include a clock mux and
* prescaler unit.
* @clk_ioclk: True if clock is present on this device
+ * @has_loopback: True if loopback mode can be supported
*
* The Samsung s3c64xx SPI controller are used on various Samsung SoC's but
* differ in some aspects such as the size of the fifo and spi bus clock
@@ -146,9 +149,11 @@ struct s3c64xx_spi_port_config {
int rx_lvl_offset;
int tx_st_done;
int quirks;
+ int clk_div;
bool high_speed;
bool clk_from_cmu;
bool clk_ioclk;
+ bool has_loopback;
};
/**
@@ -350,19 +355,59 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
if (is_polling(sdd))
return 0;
+ /* Requests DMA channels */
+ sdd->rx_dma.ch = dma_request_chan(&sdd->pdev->dev, "rx");
+ if (IS_ERR(sdd->rx_dma.ch)) {
+ dev_err(&sdd->pdev->dev, "Failed to get RX DMA channel\n");
+ sdd->rx_dma.ch = NULL;
+ return 0;
+ }
+
+ sdd->tx_dma.ch = dma_request_chan(&sdd->pdev->dev, "tx");
+ if (IS_ERR(sdd->tx_dma.ch)) {
+ dev_err(&sdd->pdev->dev, "Failed to get TX DMA channel\n");
+ dma_release_channel(sdd->rx_dma.ch);
+ sdd->tx_dma.ch = NULL;
+ sdd->rx_dma.ch = NULL;
+ return 0;
+ }
+
spi->dma_rx = sdd->rx_dma.ch;
spi->dma_tx = sdd->tx_dma.ch;
return 0;
}
+static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)
+{
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
+
+ if (is_polling(sdd))
+ return 0;
+
+ /* Releases DMA channels if they are allocated */
+ if (sdd->rx_dma.ch && sdd->tx_dma.ch) {
+ dma_release_channel(sdd->rx_dma.ch);
+ dma_release_channel(sdd->tx_dma.ch);
+ sdd->rx_dma.ch = 0;
+ sdd->tx_dma.ch = 0;
+ }
+
+ return 0;
+}
+
static bool s3c64xx_spi_can_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
- return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
+ if (sdd->rx_dma.ch && sdd->tx_dma.ch) {
+ return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
+ } else {
+ return false;
+ }
+
}
static int s3c64xx_enable_datapath(struct s3c64xx_spi_driver_data *sdd,
@@ -577,6 +622,7 @@ static int s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
void __iomem *regs = sdd->regs;
int ret;
u32 val;
+ int div = sdd->port_conf->clk_div;
/* Disable Clock */
if (!sdd->port_conf->clk_from_cmu) {
@@ -619,19 +665,21 @@ static int s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
break;
}
+ if ((sdd->cur_mode & SPI_LOOP) && sdd->port_conf->has_loopback)
+ val |= S3C64XX_SPI_MODE_SELF_LOOPBACK;
+
writel(val, regs + S3C64XX_SPI_MODE_CFG);
if (sdd->port_conf->clk_from_cmu) {
- /* The src_clk clock is divided internally by 2 */
- ret = clk_set_rate(sdd->src_clk, sdd->cur_speed * 2);
+ ret = clk_set_rate(sdd->src_clk, sdd->cur_speed * div);
if (ret)
return ret;
- sdd->cur_speed = clk_get_rate(sdd->src_clk) / 2;
+ sdd->cur_speed = clk_get_rate(sdd->src_clk) / div;
} else {
/* Configure Clock */
val = readl(regs + S3C64XX_SPI_CLK_CFG);
val &= ~S3C64XX_SPI_PSR_MASK;
- val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1)
+ val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / div - 1)
& S3C64XX_SPI_PSR_MASK);
writel(val, regs + S3C64XX_SPI_CLK_CFG);
@@ -697,7 +745,7 @@ static int s3c64xx_spi_transfer_one(struct spi_master *master,
sdd->rx_dma.ch && sdd->tx_dma.ch) {
use_dma = 1;
- } else if (is_polling(sdd) && xfer->len > fifo_len) {
+ } else if (xfer->len > fifo_len) {
tx_buf = xfer->tx_buf;
rx_buf = xfer->rx_buf;
origin_len = xfer->len;
@@ -825,6 +873,7 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
struct s3c64xx_spi_driver_data *sdd;
int err;
+ int div;
sdd = spi_master_get_devdata(spi->master);
if (spi->dev.of_node) {
@@ -843,22 +892,24 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
pm_runtime_get_sync(&sdd->pdev->dev);
+ div = sdd->port_conf->clk_div;
+
/* Check if we can provide the requested rate */
if (!sdd->port_conf->clk_from_cmu) {
u32 psr, speed;
/* Max possible */
- speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1);
+ speed = clk_get_rate(sdd->src_clk) / div / (0 + 1);
if (spi->max_speed_hz > speed)
spi->max_speed_hz = speed;
- psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1;
+ psr = clk_get_rate(sdd->src_clk) / div / spi->max_speed_hz - 1;
psr &= S3C64XX_SPI_PSR_MASK;
if (psr == S3C64XX_SPI_PSR_MASK)
psr--;
- speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
+ speed = clk_get_rate(sdd->src_clk) / div / (psr + 1);
if (spi->max_speed_hz < speed) {
if (psr+1 < S3C64XX_SPI_PSR_MASK) {
psr++;
@@ -868,7 +919,7 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
}
- speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1);
+ speed = clk_get_rate(sdd->src_clk) / div / (psr + 1);
if (spi->max_speed_hz >= speed) {
spi->max_speed_hz = speed;
} else {
@@ -1098,6 +1149,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
master->setup = s3c64xx_spi_setup;
master->cleanup = s3c64xx_spi_cleanup;
master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
+ master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
master->prepare_message = s3c64xx_spi_prepare_message;
master->transfer_one = s3c64xx_spi_transfer_one;
master->num_chipselect = sci->num_cs;
@@ -1107,6 +1159,8 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
SPI_BPW_MASK(8);
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+ if (sdd->port_conf->has_loopback)
+ master->mode_bits |= SPI_LOOP;
master->auto_runtime_pm = true;
if (!is_polling(sdd))
master->can_dma = s3c64xx_spi_can_dma;
@@ -1167,22 +1221,6 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
}
}
- if (!is_polling(sdd)) {
- /* Acquire DMA channels */
- sdd->rx_dma.ch = dma_request_chan(&pdev->dev, "rx");
- if (IS_ERR(sdd->rx_dma.ch)) {
- dev_err(&pdev->dev, "Failed to get RX DMA channel\n");
- ret = PTR_ERR(sdd->rx_dma.ch);
- goto err_disable_io_clk;
- }
- sdd->tx_dma.ch = dma_request_chan(&pdev->dev, "tx");
- if (IS_ERR(sdd->tx_dma.ch)) {
- dev_err(&pdev->dev, "Failed to get TX DMA channel\n");
- ret = PTR_ERR(sdd->tx_dma.ch);
- goto err_release_rx_dma;
- }
- }
-
pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
@@ -1228,12 +1266,6 @@ err_pm_put:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
- if (!is_polling(sdd))
- dma_release_channel(sdd->tx_dma.ch);
-err_release_rx_dma:
- if (!is_polling(sdd))
- dma_release_channel(sdd->rx_dma.ch);
-err_disable_io_clk:
clk_disable_unprepare(sdd->ioclk);
err_disable_src_clk:
clk_disable_unprepare(sdd->src_clk);
@@ -1369,6 +1401,7 @@ static const struct s3c64xx_spi_port_config s3c2443_spi_port_config = {
.fifo_lvl_mask = { 0x7f },
.rx_lvl_offset = 13,
.tx_st_done = 21,
+ .clk_div = 2,
.high_speed = true,
};
@@ -1376,12 +1409,14 @@ static const struct s3c64xx_spi_port_config s3c6410_spi_port_config = {
.fifo_lvl_mask = { 0x7f, 0x7F },
.rx_lvl_offset = 13,
.tx_st_done = 21,
+ .clk_div = 2,
};
static const struct s3c64xx_spi_port_config s5pv210_spi_port_config = {
.fifo_lvl_mask = { 0x1ff, 0x7F },
.rx_lvl_offset = 15,
.tx_st_done = 25,
+ .clk_div = 2,
.high_speed = true,
};
@@ -1389,6 +1424,7 @@ static const struct s3c64xx_spi_port_config exynos4_spi_port_config = {
.fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F },
.rx_lvl_offset = 15,
.tx_st_done = 25,
+ .clk_div = 2,
.high_speed = true,
.clk_from_cmu = true,
.quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
@@ -1398,6 +1434,7 @@ static const struct s3c64xx_spi_port_config exynos7_spi_port_config = {
.fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff},
.rx_lvl_offset = 15,
.tx_st_done = 25,
+ .clk_div = 2,
.high_speed = true,
.clk_from_cmu = true,
.quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
@@ -1407,16 +1444,31 @@ static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
.fifo_lvl_mask = { 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff},
.rx_lvl_offset = 15,
.tx_st_done = 25,
+ .clk_div = 2,
+ .high_speed = true,
+ .clk_from_cmu = true,
+ .clk_ioclk = true,
+ .quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
+};
+
+static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
+ .fifo_lvl_mask = { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
+ 0x7f, 0x7f, 0x7f, 0x7f},
+ .rx_lvl_offset = 15,
+ .tx_st_done = 25,
+ .clk_div = 4,
.high_speed = true,
.clk_from_cmu = true,
.clk_ioclk = true,
+ .has_loopback = true,
.quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
};
-static struct s3c64xx_spi_port_config fsd_spi_port_config = {
+static const struct s3c64xx_spi_port_config fsd_spi_port_config = {
.fifo_lvl_mask = { 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
.rx_lvl_offset = 15,
.tx_st_done = 25,
+ .clk_div = 2,
.high_speed = true,
.clk_from_cmu = true,
.clk_ioclk = false,
@@ -1453,6 +1505,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = {
{ .compatible = "samsung,exynos5433-spi",
.data = (void *)&exynos5433_spi_port_config,
},
+ { .compatible = "samsung,exynosautov9-spi",
+ .data = (void *)&exynosautov9_spi_port_config,
+ },
{ .compatible = "tesla,fsd-spi",
.data = (void *)&fsd_spi_port_config,
},
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 18:48:47 +0000