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path: root/drivers/spi/spi-imx.c
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Diffstat (limited to 'drivers/spi/spi-imx.c')
-rw-r--r--drivers/spi/spi-imx.c92
1 files changed, 36 insertions, 56 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index b402530a7a9a..f9698b7aeb3b 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -56,10 +56,6 @@
/* The maximum bytes that a sdma BD can transfer.*/
#define MAX_SDMA_BD_BYTES (1 << 15)
-struct spi_imx_config {
- unsigned int speed_hz;
- unsigned int bpw;
-};
enum spi_imx_devtype {
IMX1_CSPI,
@@ -74,7 +70,7 @@ struct spi_imx_data;
struct spi_imx_devtype_data {
void (*intctrl)(struct spi_imx_data *, int);
- int (*config)(struct spi_device *, struct spi_imx_config *);
+ int (*config)(struct spi_device *);
void (*trigger)(struct spi_imx_data *);
int (*rx_available)(struct spi_imx_data *);
void (*reset)(struct spi_imx_data *);
@@ -94,7 +90,8 @@ struct spi_imx_data {
unsigned long spi_clk;
unsigned int spi_bus_clk;
- unsigned int bytes_per_word;
+ unsigned int speed_hz;
+ unsigned int bits_per_word;
unsigned int spi_drctl;
unsigned int count;
@@ -203,34 +200,27 @@ out:
return i;
}
-static int spi_imx_bytes_per_word(const int bpw)
+static int spi_imx_bytes_per_word(const int bits_per_word)
{
- return DIV_ROUND_UP(bpw, BITS_PER_BYTE);
+ return DIV_ROUND_UP(bits_per_word, BITS_PER_BYTE);
}
static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *transfer)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
- unsigned int bpw, i;
+ unsigned int bytes_per_word, i;
if (!master->dma_rx)
return false;
- if (!transfer)
- return false;
-
- bpw = transfer->bits_per_word;
- if (!bpw)
- bpw = spi->bits_per_word;
-
- bpw = spi_imx_bytes_per_word(bpw);
+ bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word);
- if (bpw != 1 && bpw != 2 && bpw != 4)
+ if (bytes_per_word != 1 && bytes_per_word != 2 && bytes_per_word != 4)
return false;
for (i = spi_imx_get_fifosize(spi_imx) / 2; i > 0; i--) {
- if (!(transfer->len % (i * bpw)))
+ if (!(transfer->len % (i * bytes_per_word)))
break;
}
@@ -340,12 +330,11 @@ static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
}
-static int mx51_ecspi_config(struct spi_device *spi,
- struct spi_imx_config *config)
+static int mx51_ecspi_config(struct spi_device *spi)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
- u32 clk = config->speed_hz, delay, reg;
+ u32 clk = spi_imx->speed_hz, delay, reg;
u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
/*
@@ -364,13 +353,13 @@ static int mx51_ecspi_config(struct spi_device *spi,
ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl);
/* set clock speed */
- ctrl |= mx51_ecspi_clkdiv(spi_imx, config->speed_hz, &clk);
+ ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->speed_hz, &clk);
spi_imx->spi_bus_clk = clk;
/* set chip select to use */
ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
- ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
+ ctrl |= (spi_imx->bits_per_word - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
@@ -501,21 +490,21 @@ static void mx31_trigger(struct spi_imx_data *spi_imx)
writel(reg, spi_imx->base + MXC_CSPICTRL);
}
-static int mx31_config(struct spi_device *spi, struct spi_imx_config *config)
+static int mx31_config(struct spi_device *spi)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
unsigned int clk;
- reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
+ reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->speed_hz, &clk) <<
MX31_CSPICTRL_DR_SHIFT;
spi_imx->spi_bus_clk = clk;
if (is_imx35_cspi(spi_imx)) {
- reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
+ reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT;
reg |= MX31_CSPICTRL_SSCTL;
} else {
- reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
+ reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT;
}
if (spi->mode & SPI_CPHA)
@@ -597,18 +586,18 @@ static void mx21_trigger(struct spi_imx_data *spi_imx)
writel(reg, spi_imx->base + MXC_CSPICTRL);
}
-static int mx21_config(struct spi_device *spi, struct spi_imx_config *config)
+static int mx21_config(struct spi_device *spi)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
unsigned int clk;
- reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max, &clk)
+ reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, spi_imx->speed_hz, max, &clk)
<< MX21_CSPICTRL_DR_SHIFT;
spi_imx->spi_bus_clk = clk;
- reg |= config->bpw - 1;
+ reg |= spi_imx->bits_per_word - 1;
if (spi->mode & SPI_CPHA)
reg |= MX21_CSPICTRL_PHA;
@@ -666,17 +655,17 @@ static void mx1_trigger(struct spi_imx_data *spi_imx)
writel(reg, spi_imx->base + MXC_CSPICTRL);
}
-static int mx1_config(struct spi_device *spi, struct spi_imx_config *config)
+static int mx1_config(struct spi_device *spi)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
unsigned int clk;
- reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
+ reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, spi_imx->speed_hz, &clk) <<
MX1_CSPICTRL_DR_SHIFT;
spi_imx->spi_bus_clk = clk;
- reg |= config->bpw - 1;
+ reg |= spi_imx->bits_per_word - 1;
if (spi->mode & SPI_CPHA)
reg |= MX1_CSPICTRL_PHA;
@@ -841,15 +830,14 @@ static irqreturn_t spi_imx_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int spi_imx_dma_configure(struct spi_master *master,
- int bytes_per_word)
+static int spi_imx_dma_configure(struct spi_master *master)
{
int ret;
enum dma_slave_buswidth buswidth;
struct dma_slave_config rx = {}, tx = {};
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
- switch (bytes_per_word) {
+ switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) {
case 4:
buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
@@ -883,8 +871,6 @@ static int spi_imx_dma_configure(struct spi_master *master,
return ret;
}
- spi_imx->bytes_per_word = bytes_per_word;
-
return 0;
}
@@ -892,22 +878,19 @@ static int spi_imx_setupxfer(struct spi_device *spi,
struct spi_transfer *t)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
- struct spi_imx_config config;
int ret;
- config.bpw = t ? t->bits_per_word : spi->bits_per_word;
- config.speed_hz = t ? t->speed_hz : spi->max_speed_hz;
+ if (!t)
+ return 0;
- if (!config.speed_hz)
- config.speed_hz = spi->max_speed_hz;
- if (!config.bpw)
- config.bpw = spi->bits_per_word;
+ spi_imx->bits_per_word = t->bits_per_word;
+ spi_imx->speed_hz = t->speed_hz;
/* Initialize the functions for transfer */
- if (config.bpw <= 8) {
+ if (spi_imx->bits_per_word <= 8) {
spi_imx->rx = spi_imx_buf_rx_u8;
spi_imx->tx = spi_imx_buf_tx_u8;
- } else if (config.bpw <= 16) {
+ } else if (spi_imx->bits_per_word <= 16) {
spi_imx->rx = spi_imx_buf_rx_u16;
spi_imx->tx = spi_imx_buf_tx_u16;
} else {
@@ -921,13 +904,12 @@ static int spi_imx_setupxfer(struct spi_device *spi,
spi_imx->usedma = 0;
if (spi_imx->usedma) {
- ret = spi_imx_dma_configure(spi->master,
- spi_imx_bytes_per_word(config.bpw));
+ ret = spi_imx_dma_configure(spi->master);
if (ret)
return ret;
}
- spi_imx->devtype_data->config(spi, &config);
+ spi_imx->devtype_data->config(spi);
return 0;
}
@@ -976,8 +958,6 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
goto err;
}
- spi_imx_dma_configure(master, 1);
-
init_completion(&spi_imx->dma_rx_completion);
init_completion(&spi_imx->dma_tx_completion);
master->can_dma = spi_imx_can_dma;
@@ -1189,15 +1169,15 @@ static int spi_imx_probe(struct platform_device *pdev)
}
master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data));
+ if (!master)
+ return -ENOMEM;
+
ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl);
if ((ret < 0) || (spi_drctl >= 0x3)) {
/* '11' is reserved */
spi_drctl = 0;
}
- if (!master)
- return -ENOMEM;
-
platform_set_drvdata(pdev, master);
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 20:45:38 +0100