diff options
| author | Pascal Linder <pascal.linder@edu.hefr.ch> | 2019-06-18 08:41:02 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2019-07-11 10:58:03 +0200 |
| commit | 53c3050d0dd3f885c35f5c44293c86a9b199c5ca (patch) | |
| tree | d110bd463b8498ad5ed3a5ff312c71098cf58a2f /board | |
| parent | f1696534838e45623c276658b4b7c9331181d60c (diff) | |
km/spi: overwrite kirkwood_spi weak functions for KM Kirkwood boards
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.linder@edu.hefr.ch>
Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'board')
| -rw-r--r-- | board/keymile/km_arm/km_arm.c | 31 |
1 files changed, 31 insertions, 0 deletions
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 |