diff options
Diffstat (limited to 'drivers/spi/spi-ath79.c')
| -rw-r--r-- | drivers/spi/spi-ath79.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c index d1e287d2d9cd..607e7a49fb89 100644 --- a/drivers/spi/spi-ath79.c +++ b/drivers/spi/spi-ath79.c @@ -15,6 +15,7 @@ #include <linux/platform_device.h> #include <linux/io.h> #include <linux/spi/spi.h> +#include <linux/spi/spi-mem.h> #include <linux/spi/spi_bitbang.h> #include <linux/bitops.h> #include <linux/clk.h> @@ -133,6 +134,38 @@ static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned int nsecs, return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS); } +static int ath79_exec_mem_op(struct spi_mem *mem, + const struct spi_mem_op *op) +{ + struct ath79_spi *sp = ath79_spidev_to_sp(mem->spi); + + /* Ensures that reading is performed on device connected to hardware cs0 */ + if (mem->spi->chip_select || mem->spi->cs_gpiod) + return -ENOTSUPP; + + /* Only use for fast-read op. */ + if (op->cmd.opcode != 0x0b || op->data.dir != SPI_MEM_DATA_IN || + op->addr.nbytes != 3 || op->dummy.nbytes != 1) + return -ENOTSUPP; + + /* disable GPIO mode */ + ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0); + + memcpy_fromio(op->data.buf.in, sp->base + op->addr.val, op->data.nbytes); + + /* enable GPIO mode */ + ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO); + + /* restore IOC register */ + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base); + + return 0; +} + +static const struct spi_controller_mem_ops ath79_mem_ops = { + .exec_op = ath79_exec_mem_op, +}; + static int ath79_spi_probe(struct platform_device *pdev) { struct spi_master *master; @@ -154,6 +187,7 @@ static int ath79_spi_probe(struct platform_device *pdev) master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); master->flags = SPI_MASTER_GPIO_SS; master->num_chipselect = 3; + master->mem_ops = &ath79_mem_ops; sp->bitbang.master = master; sp->bitbang.chipselect = ath79_spi_chipselect; |