diff options
| author | Felix Held <felix-coreboot@felixheld.de> | 2021-07-22 17:41:38 +0200 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-08-30 19:46:17 +0000 |
| commit | fd2982ec8a61894d466efc47a9d724a93af6ddc6 (patch) | |
| tree | f8216b351fb0109a9c807bfa1fda8edfed7aa95e /src | |
| parent | ce5813fdc5d527803ab560cec5e798a04b210d3e (diff) | |
soc/amd/cezanne/fch: implement and use fch_clk_output_48Mhz
Make sure that the 48MHz clock output that is typically used as a clock
source for an I2S audio codec or a Super I/O chip.
TEST=On Guybrush before and after this patch the final state of
MISC_CLK_CNTL0 is 0x1006044, so BP_X48M0_OUTPUT_EN is set in both cases.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I38be344a95ccf166c344b2bddcb388fea437a4df
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56528
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/amd/cezanne/fch.c | 9 | ||||
| -rw-r--r-- | src/soc/amd/cezanne/include/soc/southbridge.h | 2 |
2 files changed, 11 insertions, 0 deletions
diff --git a/src/soc/amd/cezanne/fch.c b/src/soc/amd/cezanne/fch.c index 81fb5d2f01..f39eeb6f28 100644 --- a/src/soc/amd/cezanne/fch.c +++ b/src/soc/amd/cezanne/fch.c @@ -73,6 +73,14 @@ const struct irq_idx_name *sb_get_apic_reg_association(size_t *size) return irq_association; } +static void fch_clk_output_48Mhz(void) +{ + uint32_t ctrl = misc_read32(MISC_CLK_CNTL0); + /* Enable BP_X48M0 Clock Output */ + ctrl |= BP_X48M0_OUTPUT_EN; + misc_write32(MISC_CLK_CNTL0, ctrl); +} + static void fch_init_acpi_ports(void) { u32 reg; @@ -172,6 +180,7 @@ void fch_init(void *chip_info) acpi_clear_pm_gpe_status(); gpp_clk_setup(); + fch_clk_output_48Mhz(); } void fch_final(void *chip_info) diff --git a/src/soc/amd/cezanne/include/soc/southbridge.h b/src/soc/amd/cezanne/include/soc/southbridge.h index 386d3c1e87..31387b695d 100644 --- a/src/soc/amd/cezanne/include/soc/southbridge.h +++ b/src/soc/amd/cezanne/include/soc/southbridge.h @@ -78,6 +78,8 @@ #define GPP_CLK_REQ_EXT(clk_shift) (0x1 << (clk_shift)) #define GPP_CLK_REQ_OFF(clk_shift) (0x0 << (clk_shift)) +#define MISC_CLK_CNTL0 0x40 /* named MISC_CLK_CNTL1 on Picasso */ +#define BP_X48M0_OUTPUT_EN BIT(2) /* 1=En, unlike Hudson, Kern */ #define MISC_I2C0_PAD_CTRL 0xd8 #define MISC_I2C1_PAD_CTRL 0xdc #define MISC_I2C2_PAD_CTRL 0xe0 |