diff options
| author | Craig Hesling <hesling@chromium.org> | 2020-01-28 21:16:18 -0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-02-01 19:54:52 +0000 |
| commit | e7601b5d6c6c3a0fdf0d779cfe12b9a381f0fba4 (patch) | |
| tree | 35acf72e7c4c60095b638cf3d40a6985d377dbde /src | |
| parent | 81fa1b34dc77b619378d1c2067f524900b065d02 (diff) | |
| download | coreboot-e7601b5d6c6c3a0fdf0d779cfe12b9a381f0fba4.tar.xz | |
hatch/mushu: Fix FPMCU pwr/rst gpio handling
Asserting reset in RO instead of in RW has no impact on security or
performance, but it does limit improvements to this process later.
This fix removes reset line control from RO and makes these variants
consistent with other hatch variants.
This fix reinforces the concept from commit fcd8c9e99e
(hatch: Fix FPMCU pwr/rst gpio handling).
BUG=b:148457345
TEST=None
Change-Id: I12dc0c3bead7672e2d3207771212efb0d246973a
Signed-off-by: Craig Hesling <hesling@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38623
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src')
6 files changed, 56 insertions, 6 deletions
diff --git a/src/mainboard/google/hatch/variants/hatch/Makefile.inc b/src/mainboard/google/hatch/variants/hatch/Makefile.inc index a990b5ad05..4bf640a7f4 100644 --- a/src/mainboard/google/hatch/variants/hatch/Makefile.inc +++ b/src/mainboard/google/hatch/variants/hatch/Makefile.inc @@ -19,5 +19,7 @@ SPD_SOURCES += 8G_2666 # 0b011 SPD_SOURCES += 16G_2400 # 0b100 SPD_SOURCES += 16G_2666 # 0b101 -ramstage-y += gpio.c bootblock-y += gpio.c + +ramstage-y += gpio.c +ramstage-y += ramstage.c diff --git a/src/mainboard/google/hatch/variants/hatch/gpio.c b/src/mainboard/google/hatch/variants/hatch/gpio.c index 862b28fe4a..2c4fa50cd6 100644 --- a/src/mainboard/google/hatch/variants/hatch/gpio.c +++ b/src/mainboard/google/hatch/variants/hatch/gpio.c @@ -55,8 +55,6 @@ const struct pad_config *override_gpio_table(size_t *num) * needed in this table. */ static const struct pad_config early_gpio_table[] = { - /* A12 : FPMCU_RST_ODL */ - PAD_CFG_GPO(GPP_A12, 0, DEEP), /* B15 : H1_SLAVE_SPI_CS_L */ PAD_CFG_NF(GPP_B15, NONE, DEEP, NF1), /* B16 : H1_SLAVE_SPI_CLK */ diff --git a/src/mainboard/google/hatch/variants/hatch/ramstage.c b/src/mainboard/google/hatch/variants/hatch/ramstage.c new file mode 100644 index 0000000000..5459f55cd1 --- /dev/null +++ b/src/mainboard/google/hatch/variants/hatch/ramstage.c @@ -0,0 +1,25 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2020 The coreboot project Authors. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include <delay.h> +#include <gpio.h> +#include <baseboard/variants.h> +#include <soc/gpio.h> + +void variant_ramstage_init(void) +{ + /* + * Enable power to FPMCU, wait for power rail to stabilize, + * and then deassert FPMCU reset. + * Waiting for the power rail to stabilize can take a while, + * a minimum of 400us on Kohaku. + */ + gpio_output(GPP_C11, 1); + mdelay(1); + gpio_output(GPP_A12, 1); +} diff --git a/src/mainboard/google/hatch/variants/mushu/Makefile.inc b/src/mainboard/google/hatch/variants/mushu/Makefile.inc index a990b5ad05..4bf640a7f4 100644 --- a/src/mainboard/google/hatch/variants/mushu/Makefile.inc +++ b/src/mainboard/google/hatch/variants/mushu/Makefile.inc @@ -19,5 +19,7 @@ SPD_SOURCES += 8G_2666 # 0b011 SPD_SOURCES += 16G_2400 # 0b100 SPD_SOURCES += 16G_2666 # 0b101 -ramstage-y += gpio.c bootblock-y += gpio.c + +ramstage-y += gpio.c +ramstage-y += ramstage.c diff --git a/src/mainboard/google/hatch/variants/mushu/gpio.c b/src/mainboard/google/hatch/variants/mushu/gpio.c index a60662a264..fd12eb0e52 100644 --- a/src/mainboard/google/hatch/variants/mushu/gpio.c +++ b/src/mainboard/google/hatch/variants/mushu/gpio.c @@ -59,8 +59,6 @@ const struct pad_config *override_gpio_table(size_t *num) * needed in this table. */ static const struct pad_config early_gpio_table[] = { - /* A12 : FPMCU_RST_ODL */ - PAD_CFG_GPO(GPP_A12, 0, DEEP), /* B15 : H1_SLAVE_SPI_CS_L */ PAD_CFG_NF(GPP_B15, NONE, DEEP, NF1), /* B16 : H1_SLAVE_SPI_CLK */ diff --git a/src/mainboard/google/hatch/variants/mushu/ramstage.c b/src/mainboard/google/hatch/variants/mushu/ramstage.c new file mode 100644 index 0000000000..5459f55cd1 --- /dev/null +++ b/src/mainboard/google/hatch/variants/mushu/ramstage.c @@ -0,0 +1,25 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2020 The coreboot project Authors. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include <delay.h> +#include <gpio.h> +#include <baseboard/variants.h> +#include <soc/gpio.h> + +void variant_ramstage_init(void) +{ + /* + * Enable power to FPMCU, wait for power rail to stabilize, + * and then deassert FPMCU reset. + * Waiting for the power rail to stabilize can take a while, + * a minimum of 400us on Kohaku. + */ + gpio_output(GPP_C11, 1); + mdelay(1); + gpio_output(GPP_A12, 1); +} |