Patrick Georgi | ac95903 | 2020-05-05 22:49:26 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
Patrick Rudolph | 5e9dc37 | 2017-11-19 09:11:58 +0100 | [diff] [blame] | 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <inttypes.h> |
| 5 | |
| 6 | #include "intelmetool.h" |
| 7 | #include "mmap.h" |
| 8 | #include "rcba.h" |
| 9 | |
| 10 | static const int size = 0x4000; |
| 11 | |
| 12 | /* Returns the physical RCBA base address or zero on error. */ |
Patrick Rudolph | 0391d0b | 2018-02-01 16:14:19 +0100 | [diff] [blame] | 13 | u32 get_rcba_phys(void) |
Patrick Rudolph | 5e9dc37 | 2017-11-19 09:11:58 +0100 | [diff] [blame] | 14 | { |
| 15 | struct pci_access *pacc; |
| 16 | struct pci_dev *sb; |
| 17 | uint32_t rcba_phys; |
| 18 | |
| 19 | pacc = pci_alloc(); |
| 20 | pacc->method = PCI_ACCESS_I386_TYPE1; |
| 21 | |
| 22 | pci_init(pacc); |
| 23 | pci_scan_bus(pacc); |
| 24 | |
| 25 | sb = pci_get_dev(pacc, 0, 0, 0x1f, 0); |
| 26 | if (!sb) { |
| 27 | printf("Uh oh, southbridge not on BDF(0:31:0), please report " |
| 28 | "this error, exiting.\n"); |
| 29 | pci_cleanup(pacc); |
| 30 | return 0; |
| 31 | } |
| 32 | pci_fill_info(sb, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | |
| 33 | PCI_FILL_CLASS); |
| 34 | |
| 35 | rcba_phys = pci_read_long(sb, 0xf0) & 0xfffffffe; |
| 36 | |
| 37 | pci_free_dev(sb); |
| 38 | pci_cleanup(pacc); |
| 39 | |
| 40 | return rcba_phys; |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Writes 'val' to RCBA register at address 'addr'. |
| 45 | * Returns 1 on error and 0 on success. |
| 46 | */ |
| 47 | int write_rcba32(uint32_t addr, uint32_t val) |
| 48 | { |
| 49 | volatile uint8_t *rcba; |
| 50 | const uint32_t rcba_phys = get_rcba_phys(); |
| 51 | |
| 52 | if (!rcba_phys) { |
| 53 | printf("Could not get RCBA address\n"); |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | rcba = map_physical((off_t)rcba_phys, size); |
| 58 | if (rcba == NULL) { |
Patrick Rudolph | ad4ddfc | 2018-02-02 15:07:09 +0100 | [diff] [blame] | 59 | printf("Could not map RCBA\n" |
Jonathan Neuschäfer | 5be7bb3 | 2018-04-17 13:06:49 +0200 | [diff] [blame] | 60 | "Do you have kernel cmdline argument 'iomem=relaxed' set ?\n"); |
Patrick Rudolph | 5e9dc37 | 2017-11-19 09:11:58 +0100 | [diff] [blame] | 61 | return 1; |
| 62 | } |
| 63 | *(uint32_t *)(rcba + addr) = val; |
| 64 | |
| 65 | munmap((void *)rcba, size); |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * Reads RCBA register at address 'addr' and stores it in 'val'. |
| 71 | * Returns 1 on error and 0 on success. |
| 72 | */ |
| 73 | int read_rcba32(uint32_t addr, uint32_t *val) |
| 74 | { |
| 75 | volatile uint8_t *rcba; |
| 76 | const uint32_t rcba_phys = get_rcba_phys(); |
| 77 | |
| 78 | if (!rcba_phys) { |
| 79 | printf("Could not get RCBA address\n"); |
| 80 | return 1; |
| 81 | } |
| 82 | |
| 83 | rcba = map_physical((off_t)rcba_phys, size); |
| 84 | if (rcba == NULL) { |
Patrick Rudolph | ad4ddfc | 2018-02-02 15:07:09 +0100 | [diff] [blame] | 85 | printf("Could not map RCBA\n" |
Jonathan Neuschäfer | 5be7bb3 | 2018-04-17 13:06:49 +0200 | [diff] [blame] | 86 | "Do you have kernel cmdline argument 'iomem=relaxed' set ?\n"); |
Patrick Rudolph | 5e9dc37 | 2017-11-19 09:11:58 +0100 | [diff] [blame] | 87 | return 1; |
| 88 | } |
| 89 | |
| 90 | *val = *(uint32_t *)(rcba + addr); |
| 91 | |
| 92 | munmap((void *)rcba, size); |
| 93 | return 0; |
| 94 | } |