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69 lines
2.0 KiB
Diff
69 lines
2.0 KiB
Diff
From 8d8cdb4a6ccee5b62cc0dc64651c3946364514dc Mon Sep 17 00:00:00 2001
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From: Luiz Angelo Daros de Luca <luizluca@gmail.com>
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Date: Mon, 10 Feb 2020 16:11:27 -0300
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Subject: [PATCH] spi: ath79: Implement the spi_mem interface
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Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
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---
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drivers/spi/spi-ath79.c | 35 +++++++++++++++++++++++++++++++++++
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1 file changed, 35 insertions(+)
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--- a/drivers/spi/spi-ath79.c
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+++ b/drivers/spi/spi-ath79.c
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@@ -15,6 +15,7 @@
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/spi/spi.h>
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+#include <linux/spi/spi-mem.h>
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#include <linux/spi/spi_bitbang.h>
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#include <linux/bitops.h>
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#include <linux/clk.h>
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@@ -133,6 +134,39 @@ static u32 ath79_spi_txrx_mode0(struct s
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return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS);
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}
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+static int ath79_exec_mem_op(struct spi_mem *mem,
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+ const struct spi_mem_op *op)
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+{
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+ struct ath79_spi *sp = ath79_spidev_to_sp(mem->spi);
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+
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+ /* Ensures that reading is performed on device connected
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+ to hardware cs0 */
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+ if (mem->spi->chip_select || mem->spi->cs_gpiod)
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+ return -ENOTSUPP;
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+
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+ /* Only use for fast-read op. */
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+ if (op->cmd.opcode != 0x0b || op->data.dir != SPI_MEM_DATA_IN ||
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+ op->addr.nbytes != 3 || op->dummy.nbytes != 1)
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+ return -ENOTSUPP;
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+
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+ /* disable GPIO mode */
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+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
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+
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+ memcpy_fromio(op->data.buf.in, sp->base + op->addr.val, op->data.nbytes);
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+
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+ /* enable GPIO mode */
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+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
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+
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+ /* restore IOC register */
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+ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
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+
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+ return 0;
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+}
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+
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+static const struct spi_controller_mem_ops ath79_mem_ops = {
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+ .exec_op = ath79_exec_mem_op,
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+};
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+
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static int ath79_spi_probe(struct platform_device *pdev)
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{
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struct spi_master *master;
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@@ -163,6 +197,7 @@ static int ath79_spi_probe(struct platfo
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ret = PTR_ERR(sp->base);
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goto err_put_master;
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}
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+ master->mem_ops = &ath79_mem_ops;
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sp->clk = devm_clk_get(&pdev->dev, "ahb");
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if (IS_ERR(sp->clk)) {
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