mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 06:08:08 +00:00
69 lines
2.0 KiB
Diff
69 lines
2.0 KiB
Diff
|
From 8d8cdb4a6ccee5b62cc0dc64651c3946364514dc Mon Sep 17 00:00:00 2001
|
||
|
|
From: Luiz Angelo Daros de Luca <luizluca@gmail.com>
|
||
|
|
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 <luizluca@gmail.com>
|
||
|
|
---
|
||
|
|
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 <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 +134,39 @@ 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)) {
|