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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <intelblocks/dmi.h>
#include <intelblocks/pcr.h>
#include <soc/pcr_ids.h>
#define MAX_GPMR_REGS 3
#define GPMR_OFFSET(x) (0x277c + (x) * 8)
#define DMI_PCR_GPMR_LIMIT_MASK 0xffff0000
#define DMI_PCR_GPMR_BASE_SHIFT 16
#define DMI_PCR_GPMR_BASE_MASK 0xffff
#define GPMR_DID_OFFSET(x) (0x2780 + (x) * 8)
#define DMI_PCR_GPMR_EN BIT(31)
/* GPMR Register read given offset */
static uint32_t gpmr_read32(uint16_t offset)
{
return pcr_read32(PID_DMI, offset);
}
/* GPMR Register write given offset and val */
static void gpmr_write32(uint16_t offset, uint32_t val)
{
return pcr_write32(PID_DMI, offset, val);
}
/* Check for available free gpmr */
static int get_available_gpmr(void)
{
int i;
uint32_t val;
for (i = 0; i < MAX_GPMR_REGS; i++) {
val = gpmr_read32(GPMR_DID_OFFSET(i));
if (!(val & DMI_PCR_GPMR_EN))
return i;
}
printk(BIOS_ERR, "%s: No available free gpmr found\n", __func__);
return CB_ERR;
}
/* Configure GPMR for the given base and size of extended BIOS Region */
enum cb_err dmi_enable_gpmr(uint32_t base, uint32_t size, uint32_t dest_id)
{
int gpmr_num;
uint32_t limit;
if (base & ~(DMI_PCR_GPMR_BASE_MASK << DMI_PCR_GPMR_BASE_SHIFT)) {
printk(BIOS_ERR, "base is not 64-KiB aligned!\n");
return CB_ERR;
}
limit = base + (size - 1);
if (limit < base) {
printk(BIOS_ERR, "Invalid limit: limit cannot be less than base!\n");
return CB_ERR;
}
if ((limit & ~DMI_PCR_GPMR_LIMIT_MASK) != 0xffff) {
printk(BIOS_ERR, "limit does not end on a 64-KiB boundary!\n");
return CB_ERR;
}
/* Get available free GPMR */
gpmr_num = get_available_gpmr();
if (gpmr_num == CB_ERR)
return CB_ERR;
/* Program Range for the given decode window */
gpmr_write32(GPMR_OFFSET(gpmr_num), (limit & DMI_PCR_GPMR_LIMIT_MASK) |
((base >> DMI_PCR_GPMR_BASE_SHIFT) & DMI_PCR_GPMR_BASE_MASK));
/* Program source decode enable bit and the Destination ID */
gpmr_write32(GPMR_DID_OFFSET(gpmr_num), dest_id | DMI_PCR_GPMR_EN);
return CB_SUCCESS;
}
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