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authorYu-Ping Wu <yupingso@google.com>2019-08-16 13:38:32 +0800
committerPatrick Georgi <pgeorgi@google.com>2019-08-21 09:27:39 +0000
commit4b3047833f9bce984e2710b98be5100f684cc337 (patch)
treefc8f38d2196f0233f2274a5147a2072a588a3dfd /src/soc/mediatek/common/spi.c
parent7fc006f7452ff944184e2091d670a647b96f9aac (diff)
downloadcoreboot-4b3047833f9bce984e2710b98be5100f684cc337.tar.xz
mediatek: Use GPIO based SPI CS
Some boards (e.g., Kukui) need GPIO based CS for SPI0. This patch changes the pinmux and binds the pins to the correponding SPIs. When using GPIO based SPI CS, we need to manually make CS log/high before/after SPI transactions. BUG=b:132311067 BRANCH=none TEST=Verified that b/132311067 is irreproducible Change-Id: I61653fb19242b6ee6be9a45545a8b66e5c9c7cad Signed-off-by: Yu-Ping Wu <yupingso@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/33165 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Hung-Te Lin <hungte@chromium.org> Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'src/soc/mediatek/common/spi.c')
-rw-r--r--src/soc/mediatek/common/spi.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/soc/mediatek/common/spi.c b/src/soc/mediatek/common/spi.c
index 40ab9b7002..2a668fe349 100644
--- a/src/soc/mediatek/common/spi.c
+++ b/src/soc/mediatek/common/spi.c
@@ -17,6 +17,8 @@
#include <assert.h>
#include <console/console.h>
#include <endian.h>
+#include <gpio.h>
+#include <stdlib.h>
#include <soc/pll.h>
#include <soc/spi.h>
#include <timer.h>
@@ -87,6 +89,8 @@ void mtk_spi_init(unsigned int bus, enum spi_pad_mask pad_select,
clrsetbits_le32(&regs->spi_pad_macro_sel_reg, SPI_PAD_SEL_MASK,
pad_select);
+
+ gpio_output(slave->cs_gpio, 1);
}
static void mtk_spi_dump_data(const char *name, const uint8_t *data, int size)
@@ -109,6 +113,8 @@ static int spi_ctrlr_claim_bus(const struct spi_slave *slave)
setbits_le32(&regs->spi_cmd_reg, 1 << SPI_CMD_PAUSE_EN_SHIFT);
mtk_slave->state = MTK_SPI_IDLE;
+ gpio_output(mtk_slave->cs_gpio, 0);
+
return 0;
}
@@ -243,6 +249,8 @@ static void spi_ctrlr_release_bus(const struct spi_slave *slave)
clrbits_le32(&regs->spi_cmd_reg, SPI_CMD_PAUSE_EN);
spi_sw_reset(regs);
mtk_slave->state = MTK_SPI_IDLE;
+
+ gpio_output(mtk_slave->cs_gpio, 1);
}
static int spi_ctrlr_setup(const struct spi_slave *slave)