Furquan Shaikh | f318e03 | 2020-05-04 23:38:53 -0700 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* This file is part of the coreboot project. */ |
| 3 | |
| 4 | #include <amdblocks/chip.h> |
| 5 | #include <amdblocks/espi.h> |
| 6 | #include <amdblocks/lpc.h> |
| 7 | #include <arch/mmio.h> |
| 8 | #include <console/console.h> |
| 9 | #include <soc/pci_devs.h> |
| 10 | #include <stddef.h> |
| 11 | #include <stdint.h> |
| 12 | #include <types.h> |
| 13 | |
| 14 | static uintptr_t espi_get_bar(void) |
| 15 | { |
| 16 | uintptr_t espi_spi_base = lpc_get_spibase(); |
| 17 | return espi_spi_base + ESPI_OFFSET_FROM_BAR; |
| 18 | } |
| 19 | |
| 20 | static uint32_t espi_read32(int reg) |
| 21 | { |
| 22 | return read32((void *)(espi_get_bar() + reg)); |
| 23 | } |
| 24 | |
| 25 | static void espi_write32(int reg, uint32_t val) |
| 26 | { |
| 27 | write32((void *)(espi_get_bar() + reg), val); |
| 28 | } |
| 29 | |
| 30 | static uint16_t espi_read16(int reg) |
| 31 | { |
| 32 | return read16((void *)(espi_get_bar() + reg)); |
| 33 | } |
| 34 | |
| 35 | static void espi_write16(int reg, uint16_t val) |
| 36 | { |
| 37 | write16((void *)(espi_get_bar() + reg), val); |
| 38 | } |
| 39 | |
| 40 | static uint8_t espi_read8(int reg) |
| 41 | { |
| 42 | return read8((void *)(espi_get_bar() + reg)); |
| 43 | } |
| 44 | |
| 45 | static void espi_write8(int reg, uint8_t val) |
| 46 | { |
| 47 | write8((void *)(espi_get_bar() + reg), val); |
| 48 | } |
| 49 | |
| 50 | static void espi_enable_decode(int decode_en) |
| 51 | { |
| 52 | uint32_t val; |
| 53 | |
| 54 | val = espi_read32(ESPI_DECODE); |
| 55 | val |= decode_en; |
| 56 | espi_write32(ESPI_DECODE, val); |
| 57 | } |
| 58 | |
| 59 | static bool espi_is_decode_enabled(int decode) |
| 60 | { |
| 61 | uint32_t val; |
| 62 | |
| 63 | val = espi_read32(ESPI_DECODE); |
| 64 | return !!(val & decode); |
| 65 | } |
| 66 | |
| 67 | static int espi_find_io_window(uint16_t win_base) |
| 68 | { |
| 69 | int i; |
| 70 | |
| 71 | for (i = 0; i < ESPI_GENERIC_IO_WIN_COUNT; i++) { |
| 72 | if (!espi_is_decode_enabled(ESPI_DECODE_IO_RANGE_EN(i))) |
| 73 | continue; |
| 74 | |
| 75 | if (espi_read16(ESPI_IO_RANGE_BASE(i)) == win_base) |
| 76 | return i; |
| 77 | } |
| 78 | |
| 79 | return -1; |
| 80 | } |
| 81 | |
| 82 | static int espi_get_unused_io_window(void) |
| 83 | { |
| 84 | int i; |
| 85 | |
| 86 | for (i = 0; i < ESPI_GENERIC_IO_WIN_COUNT; i++) { |
| 87 | if (!espi_is_decode_enabled(ESPI_DECODE_IO_RANGE_EN(i))) |
| 88 | return i; |
| 89 | } |
| 90 | |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Returns decode enable bits for standard IO port addresses. If port address is not supported |
| 96 | * by standard decode or if the size of window is not 1, then it returns -1. |
| 97 | */ |
| 98 | static int espi_std_io_decode(uint16_t base, size_t size) |
| 99 | { |
| 100 | int ret = -1; |
| 101 | |
| 102 | if (size != 1) |
| 103 | return ret; |
| 104 | |
| 105 | switch (base) { |
| 106 | case 0x80: |
| 107 | ret = ESPI_DECODE_IO_0x80_EN; |
| 108 | break; |
| 109 | case 0x60: |
| 110 | case 0x64: |
| 111 | ret = ESPI_DECODE_IO_0X60_0X64_EN; |
| 112 | break; |
| 113 | case 0x2e: |
| 114 | case 0x2f: |
| 115 | ret = ESPI_DECODE_IO_0X2E_0X2F_EN; |
| 116 | break; |
| 117 | default: |
| 118 | ret = -1; |
| 119 | break; |
| 120 | } |
| 121 | |
| 122 | return ret; |
| 123 | } |
| 124 | |
| 125 | static size_t espi_get_io_window_size(int idx) |
| 126 | { |
| 127 | return espi_read8(ESPI_IO_RANGE_SIZE(idx)) + 1; |
| 128 | } |
| 129 | |
| 130 | static void espi_write_io_window(int idx, uint16_t base, size_t size) |
| 131 | { |
| 132 | espi_write16(ESPI_IO_RANGE_BASE(idx), base); |
| 133 | espi_write8(ESPI_IO_RANGE_SIZE(idx), size - 1); |
| 134 | } |
| 135 | |
| 136 | static int espi_open_generic_io_window(uint16_t base, size_t size) |
| 137 | { |
| 138 | size_t win_size; |
| 139 | int idx; |
| 140 | |
| 141 | for (; size; size -= win_size, base += win_size) { |
| 142 | win_size = MIN(size, ESPI_GENERIC_IO_MAX_WIN_SIZE); |
| 143 | |
| 144 | idx = espi_find_io_window(base); |
| 145 | if (idx != -1) { |
| 146 | size_t curr_size = espi_get_io_window_size(idx); |
| 147 | |
| 148 | if (curr_size > win_size) { |
| 149 | printk(BIOS_INFO, "eSPI window already configured to be larger than requested! "); |
| 150 | printk(BIOS_INFO, "Base: 0x%x, Requested size: 0x%zx, Actual size: 0x%zx\n", |
| 151 | base, win_size, curr_size); |
| 152 | } else if (curr_size < win_size) { |
| 153 | espi_write_io_window(idx, base, win_size); |
| 154 | printk(BIOS_INFO, "eSPI window at base: 0x%x resized from 0x%zx to 0x%zx\n", |
| 155 | base, curr_size, win_size); |
| 156 | } |
| 157 | |
| 158 | continue; |
| 159 | } |
| 160 | |
| 161 | idx = espi_get_unused_io_window(); |
| 162 | if (idx == -1) { |
| 163 | printk(BIOS_ERR, "Cannot open IO window base %x size %zx\n", base, |
| 164 | size); |
| 165 | printk(BIOS_ERR, "ERROR: No more available IO windows!\n"); |
| 166 | return -1; |
| 167 | } |
| 168 | |
| 169 | espi_write_io_window(idx, base, win_size); |
| 170 | espi_enable_decode(ESPI_DECODE_IO_RANGE_EN(idx)); |
| 171 | } |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | int espi_open_io_window(uint16_t base, size_t size) |
| 177 | { |
| 178 | int std_io; |
| 179 | |
| 180 | std_io = espi_std_io_decode(base, size); |
| 181 | if (std_io != -1) { |
| 182 | espi_enable_decode(std_io); |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | return espi_open_generic_io_window(base, size); |
| 187 | } |
| 188 | |
| 189 | static int espi_find_mmio_window(uint32_t win_base) |
| 190 | { |
| 191 | int i; |
| 192 | |
| 193 | for (i = 0; i < ESPI_GENERIC_MMIO_WIN_COUNT; i++) { |
| 194 | if (!espi_is_decode_enabled(ESPI_DECODE_MMIO_RANGE_EN(i))) |
| 195 | continue; |
| 196 | |
| 197 | if (espi_read32(ESPI_MMIO_RANGE_BASE(i)) == win_base) |
| 198 | return i; |
| 199 | } |
| 200 | |
| 201 | return -1; |
| 202 | } |
| 203 | |
| 204 | static int espi_get_unused_mmio_window(void) |
| 205 | { |
| 206 | int i; |
| 207 | |
| 208 | for (i = 0; i < ESPI_GENERIC_MMIO_WIN_COUNT; i++) { |
| 209 | if (!espi_is_decode_enabled(ESPI_DECODE_MMIO_RANGE_EN(i))) |
| 210 | return i; |
| 211 | } |
| 212 | |
| 213 | return -1; |
| 214 | |
| 215 | } |
| 216 | |
| 217 | static size_t espi_get_mmio_window_size(int idx) |
| 218 | { |
| 219 | return espi_read16(ESPI_MMIO_RANGE_SIZE(idx)) + 1; |
| 220 | } |
| 221 | |
| 222 | static void espi_write_mmio_window(int idx, uint32_t base, size_t size) |
| 223 | { |
| 224 | espi_write32(ESPI_MMIO_RANGE_BASE(idx), base); |
| 225 | espi_write16(ESPI_MMIO_RANGE_SIZE(idx), size - 1); |
| 226 | } |
| 227 | |
| 228 | int espi_open_mmio_window(uint32_t base, size_t size) |
| 229 | { |
| 230 | size_t win_size; |
| 231 | int idx; |
| 232 | |
| 233 | for (; size; size -= win_size, base += win_size) { |
| 234 | win_size = MIN(size, ESPI_GENERIC_MMIO_MAX_WIN_SIZE); |
| 235 | |
| 236 | idx = espi_find_mmio_window(base); |
| 237 | if (idx != -1) { |
| 238 | size_t curr_size = espi_get_mmio_window_size(idx); |
| 239 | |
| 240 | if (curr_size > win_size) { |
| 241 | printk(BIOS_INFO, "eSPI window already configured to be larger than requested! "); |
| 242 | printk(BIOS_INFO, "Base: 0x%x, Requested size: 0x%zx, Actual size: 0x%zx\n", |
| 243 | base, win_size, curr_size); |
| 244 | } else if (curr_size < win_size) { |
| 245 | espi_write_mmio_window(idx, base, win_size); |
| 246 | printk(BIOS_INFO, "eSPI window at base: 0x%x resized from 0x%zx to 0x%zx\n", |
| 247 | base, curr_size, win_size); |
| 248 | } |
| 249 | |
| 250 | continue; |
| 251 | } |
| 252 | |
| 253 | idx = espi_get_unused_mmio_window(); |
| 254 | if (idx == -1) { |
| 255 | printk(BIOS_ERR, "Cannot open IO window base %x size %zx\n", base, |
| 256 | size); |
| 257 | printk(BIOS_ERR, "ERROR: No more available MMIO windows!\n"); |
| 258 | return -1; |
| 259 | } |
| 260 | |
| 261 | espi_write_mmio_window(idx, base, win_size); |
| 262 | espi_enable_decode(ESPI_DECODE_MMIO_RANGE_EN(idx)); |
| 263 | } |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static const struct espi_config *espi_get_config(void) |
| 269 | { |
| 270 | const struct soc_amd_common_config *soc_cfg = soc_get_common_config(); |
| 271 | |
| 272 | if (!soc_cfg) |
| 273 | die("Common config structure is NULL!\n"); |
| 274 | |
| 275 | return &soc_cfg->espi_config; |
| 276 | } |
| 277 | |
| 278 | void espi_configure_decodes(void) |
| 279 | { |
| 280 | int i; |
| 281 | const struct espi_config *cfg = espi_get_config(); |
| 282 | |
| 283 | espi_enable_decode(cfg->std_io_decode_bitmap); |
| 284 | |
| 285 | for (i = 0; i < ESPI_GENERIC_IO_WIN_COUNT; i++) { |
| 286 | if (cfg->generic_io_range[i].size == 0) |
| 287 | continue; |
| 288 | espi_open_generic_io_window(cfg->generic_io_range[i].base, |
| 289 | cfg->generic_io_range[i].size); |
| 290 | } |
| 291 | } |