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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>
Felix Fietkau 2017-11-05 18:34:01 +01:00
parent e0bd225269
commit e0d58157d8
1 changed files with 11 additions and 5 deletions
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16
target/linux/ar71xx/patches-4.9/461-spi-ath79-add-fast-flash-read.patch
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@ -10,10 +10,18 @@
}
static void ath79_spi_disable(struct ath79_spi *sp)
@@ -205,6 +202,33 @@ static u32 ath79_spi_txrx_mode0(struct s
@@ -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)
+{
@ -22,9 +30,6 @@
+ if (msg->addr_width > 3)
+ return -EOPNOTSUPP;
+
+ if (spi->chip_select || gpio_is_valid(spi->cs_gpio))
+ return -EOPNOTSUPP;
+
+ /* disable GPIO mode */
+ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
+
@ -44,11 +49,12 @@
static int ath79_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
@@ -234,6 +258,7 @@ static int ath79_spi_probe(struct platfo
@@ -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;