[coreboot-gerrit] Change in coreboot[master]: soc/amd/picasso: Add support for em100

[Furquan Shaikh (Code Review)]

Furquan Shaikh has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/40825 )

Change subject: soc/amd/picasso: Add support for em100
......................................................................

soc/amd/picasso: Add support for em100

This change enables support for em100 for Picasso platform. Since
em100 requires lower SPI speed, this change configures speed in all
modes as 16MHz.

BUG=b:147758054,b:153675510
BRANCH=trembyle-bringup
TEST=Verified that em100 works fine on trembyle.

Signed-off-by: Furquan Shaikh 
Change-Id: Ib5ea1fe094fda9b8dba63e94b37e61791629564f
---
M src/soc/amd/picasso/Kconfig
M src/soc/amd/picasso/southbridge.c
2 files changed, 17 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/25/40825/1

diff --git a/src/soc/amd/picasso/Kconfig b/src/soc/amd/picasso/Kconfig
index 3113b27..99e5e59 100644
--- a/src/soc/amd/picasso/Kconfig
+++ b/src/soc/amd/picasso/Kconfig
@@ -21,6 +21,7 @@
    select GENERIC_GPIO_LIB
    select IOAPIC
    select HAVE_USBDEBUG_OPTIONS
+	select HAVE_EM100_SUPPORT
    select TSC_MONOTONIC_TIMER
    select SOC_AMD_COMMON_BLOCK_SPI
    select TSC_SYNC_LFENCE
diff --git a/src/soc/amd/picasso/southbridge.c b/src/soc/amd/picasso/southbridge.c
index 1aa7b07..d37f143 100644
--- a/src/soc/amd/picasso/southbridge.c
+++ b/src/soc/amd/picasso/southbridge.c
@@ -236,13 +236,27 @@
    write32((void *)(base + SPI_CNTRL0), val | SPI_READ_MODE(mode));
 }

-static void sb_spi_config_modes(void)
+static void sb_spi_config_mb_modes(void)
 {
    const struct soc_amd_picasso_config *cfg = config_of_soc();

+	sb_read_mode(cfg->spi_read_mode);
    sb_set_spi100(cfg->spi_normal_speed, cfg->spi_fast_speed, cfg->spi_altio_speed,
    	      cfg->spi_tpm_speed);
-	sb_read_mode(cfg->spi_read_mode);
+}
+
+static void sb_spi_config_em100_modes(void)
+{
+	sb_read_mode(SPI_READ_MODE_NORMAL33M);
+	sb_set_spi100(SPI_SPEED_16M, SPI_SPEED_16M, SPI_SPEED_16M, SPI_SPEED_16M);
+}
+
+static void sb_spi_config_modes(void)
+{
+	if (CONFIG(EM100))
+		sb_spi_config_em100_modes();
+	else
+		sb_spi_config_mb_modes();
 }

static void sb_spi_init(void)