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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <intelblocks/gpmr.h>
#include <intelblocks/ioc.h>
#include <intelblocks/pcr.h>
#include <soc/pcr_ids.h>
/* GPMR Register read given offset */
uint32_t gpmr_read32(uint16_t offset)
{
if (CONFIG(SOC_INTEL_COMMON_BLOCK_IOC))
return ioc_reg_read32(offset);
else
return pcr_read32(PID_DMI, offset);
}
/* GPMR Register write given offset and val */
void gpmr_write32(uint16_t offset, uint32_t val)
{
if (CONFIG(SOC_INTEL_COMMON_BLOCK_IOC))
return ioc_reg_write32(offset, val);
else
return pcr_write32(PID_DMI, offset, val);
}
void gpmr_or32(uint16_t offset, uint32_t ordata)
{
if (CONFIG(SOC_INTEL_COMMON_BLOCK_IOC))
return ioc_reg_or32(offset, ordata);
else
return pcr_or32(PID_DMI, offset, ordata);
}
/* 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 & 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 enable_gpmr(uint32_t base, uint32_t size, uint32_t dest_id)
{
int gpmr_num;
uint32_t limit;
if (base & ~(GPMR_BASE_MASK << 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 & ~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 & GPMR_LIMIT_MASK) |
((base >> GPMR_BASE_SHIFT) & GPMR_BASE_MASK));
/* Program source decode enable bit and the Destination ID */
gpmr_write32(GPMR_DID_OFFSET(gpmr_num), dest_id | GPMR_EN);
return CB_SUCCESS;
}
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