openwrtv4/target/linux/ar71xx/patches-4.9/461-spi-ath79-add-fast-flash-read.patch
Felix Fietkau e0d58157d8 ar71xx: fix flash fast read on devices using multiple flash chips
Add a callback to allow the SPI driver to indicate which devices fast
flash read works on.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2017-11-05 18:52:12 +01:00

60 lines
1.6 KiB
Diff

--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -102,9 +102,6 @@ static void ath79_spi_enable(struct ath7
/* save CTRL register */
sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);
-
- /* TODO: setup speed? */
- ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
}
static void ath79_spi_disable(struct ath79_spi *sp)
@@ -205,6 +202,38 @@ static u32 ath79_spi_txrx_mode0(struct s
return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS);
}
+static bool ath79_spi_flash_read_supported(struct spi_device *spi)
+{
+ if (spi->chip_select || gpio_is_valid(spi->cs_gpio))
+ return false;
+
+ return true;
+}
+
+static int ath79_spi_read_flash_data(struct spi_device *spi,
+ struct spi_flash_read_message *msg)
+{
+ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
+
+ if (msg->addr_width > 3)
+ return -EOPNOTSUPP;
+
+ /* disable GPIO mode */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
+
+ memcpy_fromio(msg->buf, sp->base + msg->from, msg->len);
+
+ /* 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);
+
+ msg->retlen = msg->len;
+
+ return 0;
+}
+
static int ath79_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
@@ -234,6 +263,8 @@ static int ath79_spi_probe(struct platfo
master->num_chipselect = pdata->num_chipselect;
master->cs_gpios = pdata->cs_gpios;
}
+ master->spi_flash_read = ath79_spi_read_flash_data;
+ master->flash_read_supported = ath79_spi_flash_read_supported;
sp->bitbang.master = master;
sp->bitbang.chipselect = ath79_spi_chipselect;