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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>
This commit is contained in:
Marshall Dawson 2017-11-28 17:51:29 -07:00 committed by Martin Roth
parent d77c764dd1
commit a89d19a980
2 changed files with 51 additions and 0 deletions
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6
src/soc/amd/stoneyridge/include/soc/southbridge.h
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@ -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);

45
src/soc/amd/stoneyridge/sb_util.c
View File

@ -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);