As the SPI NOR and NAND devices share the same hardware pins, the MPP
configuration has to be changed when claiming/releasing the bus. The
current configuration is saved when claiming and restored when releasing.
Furthermore, a general-purpose output is used to switch the chip-select
signal. This is now also implemented for the DM part of the kirkwood_spi
driver.
Signed-off-by: Pascal Linder <pascal.lin...@edu.hefr.ch>
Signed-off-by: Holger Brunck <holger.bru...@ch.abb.com>
---
board/keymile/km_arm/km_arm.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/board/keymile/km_arm/km_arm.c b/board/keymile/km_arm/km_arm.c
index ea03be9eb3..7087cc520f 100644
--- a/board/keymile/km_arm/km_arm.c
+++ b/board/keymile/km_arm/km_arm.c
@@ -322,6 +322,37 @@ void board_spi_release_bus(struct spi_slave *slave)
kw_gpio_set_value(KM_FLASH_GPIO_PIN, 1);
}
+static const u32 spi_mpp_config[] = {
+ MPP1_SPI_MOSI,
+ MPP2_SPI_SCK,
+ MPP3_SPI_MISO,
+ 0
+};
+
+static u32 spi_mpp_backup[4];
+
+int mvebu_board_spi_claim_bus(struct udevice *dev)
+{
+ spi_mpp_backup[3] = 0;
+
+ /* set new spi mpp config and save current one */
+ kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup);
+
+ kw_gpio_set_value(KM_FLASH_GPIO_PIN, 0);
+
+ return 0;
+}
+
+int mvebu_board_spi_release_bus(struct udevice *dev)
+{
+ /* restore saved mpp config */
+ kirkwood_mpp_conf(spi_mpp_backup, NULL);
+
+ kw_gpio_set_value(KM_FLASH_GPIO_PIN, 1);
+
+ return 0;
+}
+
#if (defined(CONFIG_KM_PIGGY4_88E6061))
#define PHY_LED_SEL_REG 0x18
--
2.21.0
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