From 8d8cdb4a6ccee5b62cc0dc64651c3946364514dc Mon Sep 17 00:00:00 2001 From: Luiz Angelo Daros de Luca Date: Mon, 10 Feb 2020 16:11:27 -0300 Subject: [PATCH] spi: ath79: Implement the spi_mem interface Signed-off-by: Luiz Angelo Daros de Luca --- drivers/spi/spi-ath79.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) --- a/drivers/spi/spi-ath79.c +++ b/drivers/spi/spi-ath79.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -133,6 +134,39 @@ static u32 ath79_spi_txrx_mode0(struct s 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; @@ -165,6 +199,7 @@ static int ath79_spi_probe(struct platfo ret = PTR_ERR(sp->base); goto err_put_master; } + master->mem_ops = &ath79_mem_ops; sp->clk = devm_clk_get(&pdev->dev, "ahb"); if (IS_ERR(sp->clk)) {