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authorMarshall Dawson <marshalldawson3rd@gmail.com>2017-11-28 17:51:29 -0700
committerMartin Roth <martinroth@google.com>2018-01-19 19:49:19 +0000
commita89d19a9800a968c0fe4f3eb4218b9babeefb457 (patch)
treec1cb8916dbe1249a985dfd7bafa242a894abed78 /src/soc/amd
parentd77c764dd1181204b6682b657e561d0a929cf4c7 (diff)
amd/stoneyridge: Add BIOS RAM R/W functions
The internal FCH contains 256 bytes of "BiosRam" that maintains its state until RSMRST# is asserted or standby power is lost. Add functions to support read and write operations. Change-Id: I2ddf58a63e69b2775de9a8163534b13dad2ea2fe Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-on: https://review.coreboot.org/22724 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Diffstat (limited to 'src/soc/amd')
-rw-r--r--src/soc/amd/stoneyridge/include/soc/southbridge.h6
-rw-r--r--src/soc/amd/stoneyridge/sb_util.c45
2 files changed, 51 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/include/soc/southbridge.h b/src/soc/amd/stoneyridge/include/soc/southbridge.h
index 73e9b6fcd5..9f91b505c7 100644
--- a/src/soc/amd/stoneyridge/include/soc/southbridge.h
+++ b/src/soc/amd/stoneyridge/include/soc/southbridge.h
@@ -329,6 +329,12 @@ uint32_t smi_read32(uint8_t offset);
void smi_write8(uint8_t offset, uint8_t value);
void smi_write16(uint8_t offset, uint16_t value);
void smi_write32(uint8_t offset, uint32_t value);
+uint8_t biosram_read8(uint8_t offset);
+void biosram_write8(uint8_t offset, uint8_t value);
+uint16_t biosram_read16(uint8_t offset);
+void biosram_write16(uint8_t offset, uint16_t value);
+uint32_t biosram_read32(uint8_t offset);
+void biosram_write32(uint8_t offset, uint32_t value);
uint16_t pm_acpi_pm_cnt_blk(void);
uint16_t pm_acpi_pm_evt_blk(void);
void xhci_pm_write8(uint8_t reg, uint8_t value);
diff --git a/src/soc/amd/stoneyridge/sb_util.c b/src/soc/amd/stoneyridge/sb_util.c
index e394432d4a..5238506199 100644
--- a/src/soc/amd/stoneyridge/sb_util.c
+++ b/src/soc/amd/stoneyridge/sb_util.c
@@ -76,6 +76,51 @@ void smi_write8(uint8_t offset, uint8_t value)
write8((void *)(APU_SMI_BASE + offset), value);
}
+uint8_t biosram_read8(uint8_t offset)
+{
+ outb(offset, BIOSRAM_INDEX);
+ return inb(BIOSRAM_DATA);
+}
+
+void biosram_write8(uint8_t offset, uint8_t value)
+{
+ outb(offset, BIOSRAM_INDEX);
+ outb(value, BIOSRAM_DATA);
+}
+
+uint16_t biosram_read16(uint8_t offset)
+{
+ int i;
+ uint16_t value = 0;
+ for (i = sizeof(value) - 1 ; i >= 0 ; i--)
+ value = (value << 8) | biosram_read8(offset + i);
+ return value;
+}
+
+uint32_t biosram_read32(uint8_t offset)
+{
+ uint32_t value = biosram_read16(offset + sizeof(uint16_t)) << 16;
+ return value | biosram_read16(offset);
+}
+
+void biosram_write16(uint8_t offset, uint16_t value)
+{
+ int i;
+ for (i = 0 ; i < sizeof(value) ; i++) {
+ biosram_write8(offset + i, value & 0xff);
+ value >>= 8;
+ }
+}
+
+void biosram_write32(uint8_t offset, uint32_t value)
+{
+ int i;
+ for (i = 0 ; i < sizeof(value) ; i++) {
+ biosram_write8(offset + i, value & 0xff);
+ value >>= 8;
+ }
+}
+
uint16_t pm_acpi_pm_cnt_blk(void)
{
return pm_read16(PM1_CNT_BLK);