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km/spi: overwrite kirkwood_spi weak functions for KM Kirkwood boards

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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>
This commit is contained in:
Pascal Linder 2019-06-18 08:41:02 +02:00 • committed by Stefan Roese
parent f169653483
commit 53c3050d0d
1 changed files with 31 additions and 0 deletions
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31
board/keymile/km_arm/km_arm.c
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@ -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