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