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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <stdio.h>
#include <inttypes.h>
#include "intelmetool.h"
#include "mmap.h"
#include "rcba.h"
static const int size = 0x4000;
/* Returns the physical RCBA base address or zero on error. */
u32 get_rcba_phys(void)
{
struct pci_access *pacc;
struct pci_dev *sb;
uint32_t rcba_phys;
pacc = pci_alloc();
pacc->method = PCI_ACCESS_I386_TYPE1;
pci_init(pacc);
pci_scan_bus(pacc);
sb = pci_get_dev(pacc, 0, 0, 0x1f, 0);
if (!sb) {
printf("Uh oh, southbridge not on BDF(0:31:0), please report "
"this error, exiting.\n");
pci_cleanup(pacc);
return 0;
}
pci_fill_info(sb, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES |
PCI_FILL_CLASS);
rcba_phys = pci_read_long(sb, 0xf0) & 0xfffffffe;
pci_free_dev(sb);
pci_cleanup(pacc);
return rcba_phys;
}
/*
* Writes 'val' to RCBA register at address 'addr'.
* Returns 1 on error and 0 on success.
*/
int write_rcba32(uint32_t addr, uint32_t val)
{
volatile uint8_t *rcba;
const uint32_t rcba_phys = get_rcba_phys();
if (!rcba_phys) {
printf("Could not get RCBA address\n");
return 1;
}
rcba = map_physical((off_t)rcba_phys, size);
if (rcba == NULL) {
printf("Could not map RCBA\n"
"Do you have kernel cmdline argument 'iomem=relaxed' set ?\n");
return 1;
}
*(uint32_t *)(rcba + addr) = val;
munmap((void *)rcba, size);
return 0;
}
/*
* Reads RCBA register at address 'addr' and stores it in 'val'.
* Returns 1 on error and 0 on success.
*/
int read_rcba32(uint32_t addr, uint32_t *val)
{
volatile uint8_t *rcba;
const uint32_t rcba_phys = get_rcba_phys();
if (!rcba_phys) {
printf("Could not get RCBA address\n");
return 1;
}
rcba = map_physical((off_t)rcba_phys, size);
if (rcba == NULL) {
printf("Could not map RCBA\n"
"Do you have kernel cmdline argument 'iomem=relaxed' set ?\n");
return 1;
}
*val = *(uint32_t *)(rcba + addr);
munmap((void *)rcba, size);
return 0;
}
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