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soc/intel/cmn/lpc: Add APIs to enable/disable LPC write protect (WP) 

This patch implements two APIs to perform LPC/eSPI write protect enable/
disable operation using PCI configuration space register 0xDC
(BIOS Controller).

BUG=b:211954778
TEST=Able to build and boot google/redrix to OS.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I8ce831218025a1d682ea2ad6be76901b0345b362
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63687
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Subrata Banik 2022-04-18 11:30:38 +05:30 committed by Felix Held
parent bca2f02ab7
commit 77334d4984
3 changed files with 30 additions and 0 deletions
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4
src/soc/intel/common/block/include/intelblocks/lpc_lib.h
View File

@ -99,4 +99,8 @@ unsigned long southbridge_write_acpi_tables(const struct device *device,
unsigned long current,
struct acpi_rsdp *rsdp);
const uint8_t *lpc_get_pic_pirq_routing(size_t *num);
/* Enable LPC Write Protect. */
void lpc_enable_wp(void);
/* Disable LPC Write Protect. */
void lpc_disable_wp(void);
#endif /* _SOC_COMMON_BLOCK_LPC_LIB_H_ */

1
src/soc/intel/common/block/lpc/lpc_def.h
View File

@ -26,6 +26,7 @@
#define LPC_BIOS_CNTL 0xdc
#define LPC_BC_BILD (1 << 7) /* BILD */
#define LPC_BC_LE (1 << 1) /* LE */
#define LPC_BC_WPD (1 << 0) /* WPD */
#define LPC_BC_EISS (1 << 5) /* EISS */
#define LPC_PCCTL 0xE0 /* PCI Clock Control */
#define LPC_PCCTL_CLKRUN_EN (1 << 0)

25
src/soc/intel/common/block/lpc/lpc_lib.c
View File

@ -195,6 +195,31 @@ void lpc_set_eiss(void)
lpc_set_bios_control_reg(LPC_BC_EISS);
}
static void lpc_configure_write_protect(bool status)
{
const pci_devfn_t dev = PCH_DEV_LPC;
uint8_t bios_cntl;
bios_cntl = pci_read_config8(dev, LPC_BIOS_CNTL);
if (status)
bios_cntl &= ~LPC_BC_WPD;
else
bios_cntl |= LPC_BC_WPD;
pci_write_config8(dev, LPC_BIOS_CNTL, bios_cntl);
}
/* Enable LPC Write Protect. */
void lpc_enable_wp(void)
{
lpc_configure_write_protect(true);
}
/* Disable LPC Write Protect. */
void lpc_disable_wp(void)
{
lpc_configure_write_protect(false);
}
/*
* Set LPC Serial IRQ mode.
*/