^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Address translation interface via ACPI DSM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2018 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Specification for this interface is available at:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * https://cdrdv2.intel.com/v1/dl/getContent/603354
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/adxl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define ADXL_REVISION 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define ADXL_IDX_GET_ADDR_PARAMS 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define ADXL_IDX_FORWARD_TRANSLATE 0x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define ACPI_ADXL_PATH "\\_SB.ADXL"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * The specification doesn't provide a limit on how many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * components are in a memory address. But since we allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * memory based on the number the BIOS tells us, we should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * defend against insane values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define ADXL_MAX_COMPONENTS 500
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #undef pr_fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define pr_fmt(fmt) "ADXL: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static acpi_handle handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static union acpi_object *params;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static const guid_t adxl_guid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) GUID_INIT(0xAA3C050A, 0x7EA4, 0x4C1F,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 0xAF, 0xDA, 0x12, 0x67, 0xDF, 0xD3, 0xD4, 0x8D);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int adxl_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static char **adxl_component_names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static union acpi_object *adxl_dsm(int cmd, union acpi_object argv[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) union acpi_object *obj, *o;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) obj = acpi_evaluate_dsm_typed(handle, &adxl_guid, ADXL_REVISION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) cmd, argv, ACPI_TYPE_PACKAGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (!obj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) pr_info("DSM call failed for cmd=%d\n", cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (obj->package.count != 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) pr_info("Bad pkg count %d\n", obj->package.count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) o = obj->package.elements;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (o->type != ACPI_TYPE_INTEGER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) pr_info("Bad 1st element type %d\n", o->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (o->integer.value) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) pr_info("Bad ret val %llu\n", o->integer.value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) o = obj->package.elements + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (o->type != ACPI_TYPE_PACKAGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) pr_info("Bad 2nd element type %d\n", o->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) ACPI_FREE(obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * adxl_get_component_names - get list of memory component names
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Returns NULL terminated list of string names
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * Give the caller a pointer to the list of memory component names
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * e.g. { "SystemAddress", "ProcessorSocketId", "ChannelId", ... NULL }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Caller should count how many strings in order to allocate a buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * for the return from adxl_decode().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) const char * const *adxl_get_component_names(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return (const char * const *)adxl_component_names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) EXPORT_SYMBOL_GPL(adxl_get_component_names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * adxl_decode - ask BIOS to decode a system address to memory address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @addr: the address to decode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * @component_values: pointer to array of values for each component
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * Returns 0 on success, negative error code otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * The index of each value returned in the array matches the index of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * each component name returned by adxl_get_component_names().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * Components that are not defined for this address translation (e.g.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * mirror channel number for a non-mirrored address) are set to ~0ull.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int adxl_decode(u64 addr, u64 component_values[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) union acpi_object argv4[2], *results, *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int i, cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (!adxl_component_names)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) argv4[0].type = ACPI_TYPE_PACKAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) argv4[0].package.count = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) argv4[0].package.elements = &argv4[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) argv4[1].integer.type = ACPI_TYPE_INTEGER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) argv4[1].integer.value = addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) results = adxl_dsm(ADXL_IDX_FORWARD_TRANSLATE, argv4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (!results)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) r = results->package.elements + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) cnt = r->package.count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (cnt != adxl_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) ACPI_FREE(results);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) r = r->package.elements;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) for (i = 0; i < cnt; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) component_values[i] = r[i].integer.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) ACPI_FREE(results);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) EXPORT_SYMBOL_GPL(adxl_decode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int __init adxl_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) char *path = ACPI_ADXL_PATH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) union acpi_object *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) status = acpi_get_handle(NULL, path, &handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) pr_debug("No ACPI handle for path %s\n", path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!acpi_has_method(handle, "_DSM")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) pr_info("No DSM method\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (!acpi_check_dsm(handle, &adxl_guid, ADXL_REVISION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ADXL_IDX_GET_ADDR_PARAMS |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ADXL_IDX_FORWARD_TRANSLATE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) pr_info("DSM method does not support forward translate\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) params = adxl_dsm(ADXL_IDX_GET_ADDR_PARAMS, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (!params) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) pr_info("Failed to get component names\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) p = params->package.elements + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) adxl_count = p->package.count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (adxl_count > ADXL_MAX_COMPONENTS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) pr_info("Insane number of address component names %d\n", adxl_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ACPI_FREE(params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) p = p->package.elements;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * Allocate one extra for NULL termination.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) adxl_component_names = kcalloc(adxl_count + 1, sizeof(char *), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!adxl_component_names) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ACPI_FREE(params);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) for (i = 0; i < adxl_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) adxl_component_names[i] = p[i].string.pointer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) subsys_initcall(adxl_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags