diff options
Diffstat (limited to 'drivers/spi/spi-rspi.c')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 85575d45901c..06192c9ea813 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -24,6 +24,7 @@ #include <linux/sh_dma.h> #include <linux/spi/spi.h> #include <linux/spi/rspi.h> +#include <linux/spinlock.h> #define RSPI_SPCR 0x00 /* Control Register */ #define RSPI_SSLP 0x01 /* Slave Select Polarity Register */ @@ -79,8 +80,7 @@ #define SPCR_BSWAP 0x01 /* Byte Swap of read-data for DMAC */ /* SSLP - Slave Select Polarity Register */ -#define SSLP_SSL1P 0x02 /* SSL1 Signal Polarity Setting */ -#define SSLP_SSL0P 0x01 /* SSL0 Signal Polarity Setting */ +#define SSLP_SSLP(i) BIT(i) /* SSLi Signal Polarity Setting */ /* SPPCR - Pin Control Register */ #define SPPCR_MOIFE 0x20 /* MOSI Idle Value Fixing Enable */ @@ -181,7 +181,9 @@ struct rspi_data { void __iomem *addr; u32 max_speed_hz; struct spi_controller *ctlr; + struct platform_device *pdev; wait_queue_head_t wait; + spinlock_t lock; /* Protects RMW-access to RSPI_SSLP */ struct clk *clk; u16 spcmd; u8 spsr; @@ -239,7 +241,7 @@ struct spi_ops { int (*set_config_register)(struct rspi_data *rspi, int access_size); int (*transfer_one)(struct spi_controller *ctlr, struct spi_device *spi, struct spi_transfer *xfer); - u16 mode_bits; + u16 extra_mode_bits; u16 flags; u16 fifo_size; u8 num_hw_ss; @@ -919,6 +921,29 @@ static int qspi_setup_sequencer(struct rspi_data *rspi, return 0; } +static int rspi_setup(struct spi_device *spi) +{ + struct rspi_data *rspi = spi_controller_get_devdata(spi->controller); + u8 sslp; + + if (spi->cs_gpiod) + return 0; + + pm_runtime_get_sync(&rspi->pdev->dev); + spin_lock_irq(&rspi->lock); + + sslp = rspi_read8(rspi, RSPI_SSLP); + if (spi->mode & SPI_CS_HIGH) + sslp |= SSLP_SSLP(spi->chip_select); + else + sslp &= ~SSLP_SSLP(spi->chip_select); + rspi_write8(rspi, sslp, RSPI_SSLP); + + spin_unlock_irq(&rspi->lock); + pm_runtime_put(&rspi->pdev->dev); + return 0; +} + static int rspi_prepare_message(struct spi_controller *ctlr, struct spi_message *msg) { @@ -933,6 +958,8 @@ static int rspi_prepare_message(struct spi_controller *ctlr, rspi->spcmd |= SPCMD_CPOL; if (spi->mode & SPI_CPHA) rspi->spcmd |= SPCMD_CPHA; + if (spi->mode & SPI_LSB_FIRST) + rspi->spcmd |= SPCMD_LSBF; /* Configure slave signal to assert */ rspi->spcmd |= SPCMD_SSLA(spi->cs_gpiod ? rspi->ctlr->unused_native_cs @@ -1122,7 +1149,6 @@ static int rspi_remove(struct platform_device *pdev) static const struct spi_ops rspi_ops = { .set_config_register = rspi_set_config_register, .transfer_one = rspi_transfer_one, - .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP, .flags = SPI_CONTROLLER_MUST_TX, .fifo_size = 8, .num_hw_ss = 2, @@ -1131,7 +1157,6 @@ static const struct spi_ops rspi_ops = { static const struct spi_ops rspi_rz_ops = { .set_config_register = rspi_rz_set_config_register, .transfer_one = rspi_rz_transfer_one, - .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP, .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, .fifo_size = 8, /* 8 for TX, 32 for RX */ .num_hw_ss = 1, @@ -1140,8 +1165,7 @@ static const struct spi_ops rspi_rz_ops = { static const struct spi_ops qspi_ops = { .set_config_register = qspi_set_config_register, .transfer_one = qspi_transfer_one, - .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP | - SPI_TX_DUAL | SPI_TX_QUAD | + .extra_mode_bits = SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD, .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX, .fifo_size = 32, @@ -1249,16 +1273,20 @@ static int rspi_probe(struct platform_device *pdev) goto error1; } + rspi->pdev = pdev; pm_runtime_enable(&pdev->dev); init_waitqueue_head(&rspi->wait); + spin_lock_init(&rspi->lock); ctlr->bus_num = pdev->id; + ctlr->setup = rspi_setup; ctlr->auto_runtime_pm = true; ctlr->transfer_one = ops->transfer_one; ctlr->prepare_message = rspi_prepare_message; ctlr->unprepare_message = rspi_unprepare_message; - ctlr->mode_bits = ops->mode_bits; + ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST | + SPI_LOOP | ops->extra_mode_bits; ctlr->flags = ops->flags; ctlr->dev.of_node = pdev->dev.of_node; ctlr->use_gpio_descriptors = true; |