1 /* 2 * ASPEED System Control Unit 3 * 4 * Andrew Jeffery <andrew@aj.id.au> 5 * 6 * Copyright 2016 IBM Corp. 7 * 8 * This code is licensed under the GPL version 2 or later. See 9 * the COPYING file in the top-level directory. 10 */ 11 12 #include "qemu/osdep.h" 13 #include "hw/misc/aspeed_scu.h" 14 #include "hw/qdev-properties.h" 15 #include "migration/vmstate.h" 16 #include "qapi/error.h" 17 #include "qapi/visitor.h" 18 #include "qemu/bitops.h" 19 #include "qemu/log.h" 20 #include "qemu/guest-random.h" 21 #include "qemu/module.h" 22 #include "trace.h" 23 24 #define TO_REG(offset) ((offset) >> 2) 25 26 #define PROT_KEY TO_REG(0x00) 27 #define SYS_RST_CTRL TO_REG(0x04) 28 #define CLK_SEL TO_REG(0x08) 29 #define CLK_STOP_CTRL TO_REG(0x0C) 30 #define FREQ_CNTR_CTRL TO_REG(0x10) 31 #define FREQ_CNTR_EVAL TO_REG(0x14) 32 #define IRQ_CTRL TO_REG(0x18) 33 #define D2PLL_PARAM TO_REG(0x1C) 34 #define MPLL_PARAM TO_REG(0x20) 35 #define HPLL_PARAM TO_REG(0x24) 36 #define FREQ_CNTR_RANGE TO_REG(0x28) 37 #define MISC_CTRL1 TO_REG(0x2C) 38 #define PCI_CTRL1 TO_REG(0x30) 39 #define PCI_CTRL2 TO_REG(0x34) 40 #define PCI_CTRL3 TO_REG(0x38) 41 #define SYS_RST_STATUS TO_REG(0x3C) 42 #define SOC_SCRATCH1 TO_REG(0x40) 43 #define SOC_SCRATCH2 TO_REG(0x44) 44 #define MAC_CLK_DELAY TO_REG(0x48) 45 #define MISC_CTRL2 TO_REG(0x4C) 46 #define VGA_SCRATCH1 TO_REG(0x50) 47 #define VGA_SCRATCH2 TO_REG(0x54) 48 #define VGA_SCRATCH3 TO_REG(0x58) 49 #define VGA_SCRATCH4 TO_REG(0x5C) 50 #define VGA_SCRATCH5 TO_REG(0x60) 51 #define VGA_SCRATCH6 TO_REG(0x64) 52 #define VGA_SCRATCH7 TO_REG(0x68) 53 #define VGA_SCRATCH8 TO_REG(0x6C) 54 #define HW_STRAP1 TO_REG(0x70) 55 #define RNG_CTRL TO_REG(0x74) 56 #define RNG_DATA TO_REG(0x78) 57 #define SILICON_REV TO_REG(0x7C) 58 #define PINMUX_CTRL1 TO_REG(0x80) 59 #define PINMUX_CTRL2 TO_REG(0x84) 60 #define PINMUX_CTRL3 TO_REG(0x88) 61 #define PINMUX_CTRL4 TO_REG(0x8C) 62 #define PINMUX_CTRL5 TO_REG(0x90) 63 #define PINMUX_CTRL6 TO_REG(0x94) 64 #define WDT_RST_CTRL TO_REG(0x9C) 65 #define PINMUX_CTRL7 TO_REG(0xA0) 66 #define PINMUX_CTRL8 TO_REG(0xA4) 67 #define PINMUX_CTRL9 TO_REG(0xA8) 68 #define WAKEUP_EN TO_REG(0xC0) 69 #define WAKEUP_CTRL TO_REG(0xC4) 70 #define HW_STRAP2 TO_REG(0xD0) 71 #define FREE_CNTR4 TO_REG(0xE0) 72 #define FREE_CNTR4_EXT TO_REG(0xE4) 73 #define CPU2_CTRL TO_REG(0x100) 74 #define CPU2_BASE_SEG1 TO_REG(0x104) 75 #define CPU2_BASE_SEG2 TO_REG(0x108) 76 #define CPU2_BASE_SEG3 TO_REG(0x10C) 77 #define CPU2_BASE_SEG4 TO_REG(0x110) 78 #define CPU2_BASE_SEG5 TO_REG(0x114) 79 #define CPU2_CACHE_CTRL TO_REG(0x118) 80 #define UART_HPLL_CLK TO_REG(0x160) 81 #define PCIE_CTRL TO_REG(0x180) 82 #define BMC_MMIO_CTRL TO_REG(0x184) 83 #define RELOC_DECODE_BASE1 TO_REG(0x188) 84 #define RELOC_DECODE_BASE2 TO_REG(0x18C) 85 #define MAILBOX_DECODE_BASE TO_REG(0x190) 86 #define SRAM_DECODE_BASE1 TO_REG(0x194) 87 #define SRAM_DECODE_BASE2 TO_REG(0x198) 88 #define BMC_REV TO_REG(0x19C) 89 #define BMC_DEV_ID TO_REG(0x1A4) 90 91 #define SCU_IO_REGION_SIZE 0x1000 92 93 static const uint32_t ast2400_a0_resets[ASPEED_SCU_NR_REGS] = { 94 [SYS_RST_CTRL] = 0xFFCFFEDCU, 95 [CLK_SEL] = 0xF3F40000U, 96 [CLK_STOP_CTRL] = 0x19FC3E8BU, 97 [D2PLL_PARAM] = 0x00026108U, 98 [MPLL_PARAM] = 0x00030291U, 99 [HPLL_PARAM] = 0x00000291U, 100 [MISC_CTRL1] = 0x00000010U, 101 [PCI_CTRL1] = 0x20001A03U, 102 [PCI_CTRL2] = 0x20001A03U, 103 [PCI_CTRL3] = 0x04000030U, 104 [SYS_RST_STATUS] = 0x00000001U, 105 [SOC_SCRATCH1] = 0x000000C0U, /* SoC completed DRAM init */ 106 [MISC_CTRL2] = 0x00000023U, 107 [RNG_CTRL] = 0x0000000EU, 108 [PINMUX_CTRL2] = 0x0000F000U, 109 [PINMUX_CTRL3] = 0x01000000U, 110 [PINMUX_CTRL4] = 0x000000FFU, 111 [PINMUX_CTRL5] = 0x0000A000U, 112 [WDT_RST_CTRL] = 0x003FFFF3U, 113 [PINMUX_CTRL8] = 0xFFFF0000U, 114 [PINMUX_CTRL9] = 0x000FFFFFU, 115 [FREE_CNTR4] = 0x000000FFU, 116 [FREE_CNTR4_EXT] = 0x000000FFU, 117 [CPU2_BASE_SEG1] = 0x80000000U, 118 [CPU2_BASE_SEG4] = 0x1E600000U, 119 [CPU2_BASE_SEG5] = 0xC0000000U, 120 [UART_HPLL_CLK] = 0x00001903U, 121 [PCIE_CTRL] = 0x0000007BU, 122 [BMC_DEV_ID] = 0x00002402U 123 }; 124 125 /* SCU70 bit 23: 0 24Mhz. bit 11:9: 0b001 AXI:ABH ratio 2:1 */ 126 /* AST2500 revision A1 */ 127 128 static const uint32_t ast2500_a1_resets[ASPEED_SCU_NR_REGS] = { 129 [SYS_RST_CTRL] = 0xFFCFFEDCU, 130 [CLK_SEL] = 0xF3F40000U, 131 [CLK_STOP_CTRL] = 0x19FC3E8BU, 132 [D2PLL_PARAM] = 0x00026108U, 133 [MPLL_PARAM] = 0x00030291U, 134 [HPLL_PARAM] = 0x93000400U, 135 [MISC_CTRL1] = 0x00000010U, 136 [PCI_CTRL1] = 0x20001A03U, 137 [PCI_CTRL2] = 0x20001A03U, 138 [PCI_CTRL3] = 0x04000030U, 139 [SYS_RST_STATUS] = 0x00000001U, 140 [SOC_SCRATCH1] = 0x000000C0U, /* SoC completed DRAM init */ 141 [MISC_CTRL2] = 0x00000023U, 142 [RNG_CTRL] = 0x0000000EU, 143 [PINMUX_CTRL2] = 0x0000F000U, 144 [PINMUX_CTRL3] = 0x03000000U, 145 [PINMUX_CTRL4] = 0x00000000U, 146 [PINMUX_CTRL5] = 0x0000A000U, 147 [WDT_RST_CTRL] = 0x023FFFF3U, 148 [PINMUX_CTRL8] = 0xFFFF0000U, 149 [PINMUX_CTRL9] = 0x000FFFFFU, 150 [FREE_CNTR4] = 0x000000FFU, 151 [FREE_CNTR4_EXT] = 0x000000FFU, 152 [CPU2_BASE_SEG1] = 0x80000000U, 153 [CPU2_BASE_SEG4] = 0x1E600000U, 154 [CPU2_BASE_SEG5] = 0xC0000000U, 155 [UART_HPLL_CLK] = 0x00001903U, 156 [PCIE_CTRL] = 0x0000007BU, 157 [BMC_DEV_ID] = 0x00002402U 158 }; 159 160 static uint32_t aspeed_scu_get_random(void) 161 { 162 uint32_t num; 163 qemu_guest_getrandom_nofail(&num, sizeof(num)); 164 return num; 165 } 166 167 static void aspeed_scu_set_apb_freq(AspeedSCUState *s) 168 { 169 uint32_t apb_divider; 170 171 switch (s->silicon_rev) { 172 case AST2400_A0_SILICON_REV: 173 case AST2400_A1_SILICON_REV: 174 apb_divider = 2; 175 break; 176 case AST2500_A0_SILICON_REV: 177 case AST2500_A1_SILICON_REV: 178 apb_divider = 4; 179 break; 180 default: 181 g_assert_not_reached(); 182 } 183 184 s->apb_freq = s->hpll / (SCU_CLK_GET_PCLK_DIV(s->regs[CLK_SEL]) + 1) 185 / apb_divider; 186 } 187 188 static uint64_t aspeed_scu_read(void *opaque, hwaddr offset, unsigned size) 189 { 190 AspeedSCUState *s = ASPEED_SCU(opaque); 191 int reg = TO_REG(offset); 192 193 if (reg >= ARRAY_SIZE(s->regs)) { 194 qemu_log_mask(LOG_GUEST_ERROR, 195 "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n", 196 __func__, offset); 197 return 0; 198 } 199 200 switch (reg) { 201 case RNG_DATA: 202 /* On hardware, RNG_DATA works regardless of 203 * the state of the enable bit in RNG_CTRL 204 */ 205 s->regs[RNG_DATA] = aspeed_scu_get_random(); 206 break; 207 case WAKEUP_EN: 208 qemu_log_mask(LOG_GUEST_ERROR, 209 "%s: Read of write-only offset 0x%" HWADDR_PRIx "\n", 210 __func__, offset); 211 break; 212 } 213 214 return s->regs[reg]; 215 } 216 217 static void aspeed_scu_write(void *opaque, hwaddr offset, uint64_t data, 218 unsigned size) 219 { 220 AspeedSCUState *s = ASPEED_SCU(opaque); 221 int reg = TO_REG(offset); 222 223 if (reg >= ARRAY_SIZE(s->regs)) { 224 qemu_log_mask(LOG_GUEST_ERROR, 225 "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n", 226 __func__, offset); 227 return; 228 } 229 230 if (reg > PROT_KEY && reg < CPU2_BASE_SEG1 && 231 !s->regs[PROT_KEY]) { 232 qemu_log_mask(LOG_GUEST_ERROR, "%s: SCU is locked!\n", __func__); 233 return; 234 } 235 236 trace_aspeed_scu_write(offset, size, data); 237 238 switch (reg) { 239 case PROT_KEY: 240 s->regs[reg] = (data == ASPEED_SCU_PROT_KEY) ? 1 : 0; 241 return; 242 case CLK_SEL: 243 s->regs[reg] = data; 244 aspeed_scu_set_apb_freq(s); 245 break; 246 case HW_STRAP1: 247 if (ASPEED_IS_AST2500(s->regs[SILICON_REV])) { 248 s->regs[HW_STRAP1] |= data; 249 return; 250 } 251 /* Jump to assignment below */ 252 break; 253 case SILICON_REV: 254 if (ASPEED_IS_AST2500(s->regs[SILICON_REV])) { 255 s->regs[HW_STRAP1] &= ~data; 256 } else { 257 qemu_log_mask(LOG_GUEST_ERROR, 258 "%s: Write to read-only offset 0x%" HWADDR_PRIx "\n", 259 __func__, offset); 260 } 261 /* Avoid assignment below, we've handled everything */ 262 return; 263 case FREQ_CNTR_EVAL: 264 case VGA_SCRATCH1 ... VGA_SCRATCH8: 265 case RNG_DATA: 266 case FREE_CNTR4: 267 case FREE_CNTR4_EXT: 268 qemu_log_mask(LOG_GUEST_ERROR, 269 "%s: Write to read-only offset 0x%" HWADDR_PRIx "\n", 270 __func__, offset); 271 return; 272 } 273 274 s->regs[reg] = data; 275 } 276 277 static const MemoryRegionOps aspeed_scu_ops = { 278 .read = aspeed_scu_read, 279 .write = aspeed_scu_write, 280 .endianness = DEVICE_LITTLE_ENDIAN, 281 .valid.min_access_size = 4, 282 .valid.max_access_size = 4, 283 .valid.unaligned = false, 284 }; 285 286 static uint32_t aspeed_scu_get_clkin(AspeedSCUState *s) 287 { 288 if (s->hw_strap1 & SCU_HW_STRAP_CLK_25M_IN) { 289 return 25000000; 290 } else if (s->hw_strap1 & SCU_HW_STRAP_CLK_48M_IN) { 291 return 48000000; 292 } else { 293 return 24000000; 294 } 295 } 296 297 /* 298 * Strapped frequencies for the AST2400 in MHz. They depend on the 299 * clkin frequency. 300 */ 301 static const uint32_t hpll_ast2400_freqs[][4] = { 302 { 384, 360, 336, 408 }, /* 24MHz or 48MHz */ 303 { 400, 375, 350, 425 }, /* 25MHz */ 304 }; 305 306 static uint32_t aspeed_scu_calc_hpll_ast2400(AspeedSCUState *s) 307 { 308 uint32_t hpll_reg = s->regs[HPLL_PARAM]; 309 uint8_t freq_select; 310 bool clk_25m_in; 311 312 if (hpll_reg & SCU_AST2400_H_PLL_OFF) { 313 return 0; 314 } 315 316 if (hpll_reg & SCU_AST2400_H_PLL_PROGRAMMED) { 317 uint32_t multiplier = 1; 318 319 if (!(hpll_reg & SCU_AST2400_H_PLL_BYPASS_EN)) { 320 uint32_t n = (hpll_reg >> 5) & 0x3f; 321 uint32_t od = (hpll_reg >> 4) & 0x1; 322 uint32_t d = hpll_reg & 0xf; 323 324 multiplier = (2 - od) * ((n + 2) / (d + 1)); 325 } 326 327 return s->clkin * multiplier; 328 } 329 330 /* HW strapping */ 331 clk_25m_in = !!(s->hw_strap1 & SCU_HW_STRAP_CLK_25M_IN); 332 freq_select = SCU_AST2400_HW_STRAP_GET_H_PLL_CLK(s->hw_strap1); 333 334 return hpll_ast2400_freqs[clk_25m_in][freq_select] * 1000000; 335 } 336 337 static uint32_t aspeed_scu_calc_hpll_ast2500(AspeedSCUState *s) 338 { 339 uint32_t hpll_reg = s->regs[HPLL_PARAM]; 340 uint32_t multiplier = 1; 341 342 if (hpll_reg & SCU_H_PLL_OFF) { 343 return 0; 344 } 345 346 if (!(hpll_reg & SCU_H_PLL_BYPASS_EN)) { 347 uint32_t p = (hpll_reg >> 13) & 0x3f; 348 uint32_t m = (hpll_reg >> 5) & 0xff; 349 uint32_t n = hpll_reg & 0x1f; 350 351 multiplier = ((m + 1) / (n + 1)) / (p + 1); 352 } 353 354 return s->clkin * multiplier; 355 } 356 357 static void aspeed_scu_reset(DeviceState *dev) 358 { 359 AspeedSCUState *s = ASPEED_SCU(dev); 360 const uint32_t *reset; 361 uint32_t (*calc_hpll)(AspeedSCUState *s); 362 363 switch (s->silicon_rev) { 364 case AST2400_A0_SILICON_REV: 365 case AST2400_A1_SILICON_REV: 366 reset = ast2400_a0_resets; 367 calc_hpll = aspeed_scu_calc_hpll_ast2400; 368 break; 369 case AST2500_A0_SILICON_REV: 370 case AST2500_A1_SILICON_REV: 371 reset = ast2500_a1_resets; 372 calc_hpll = aspeed_scu_calc_hpll_ast2500; 373 break; 374 default: 375 g_assert_not_reached(); 376 } 377 378 memcpy(s->regs, reset, sizeof(s->regs)); 379 s->regs[SILICON_REV] = s->silicon_rev; 380 s->regs[HW_STRAP1] = s->hw_strap1; 381 s->regs[HW_STRAP2] = s->hw_strap2; 382 s->regs[PROT_KEY] = s->hw_prot_key; 383 384 /* 385 * All registers are set. Now compute the frequencies of the main clocks 386 */ 387 s->clkin = aspeed_scu_get_clkin(s); 388 s->hpll = calc_hpll(s); 389 aspeed_scu_set_apb_freq(s); 390 } 391 392 static uint32_t aspeed_silicon_revs[] = { 393 AST2400_A0_SILICON_REV, 394 AST2400_A1_SILICON_REV, 395 AST2500_A0_SILICON_REV, 396 AST2500_A1_SILICON_REV, 397 }; 398 399 bool is_supported_silicon_rev(uint32_t silicon_rev) 400 { 401 int i; 402 403 for (i = 0; i < ARRAY_SIZE(aspeed_silicon_revs); i++) { 404 if (silicon_rev == aspeed_silicon_revs[i]) { 405 return true; 406 } 407 } 408 409 return false; 410 } 411 412 static void aspeed_scu_realize(DeviceState *dev, Error **errp) 413 { 414 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 415 AspeedSCUState *s = ASPEED_SCU(dev); 416 417 if (!is_supported_silicon_rev(s->silicon_rev)) { 418 error_setg(errp, "Unknown silicon revision: 0x%" PRIx32, 419 s->silicon_rev); 420 return; 421 } 422 423 memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_scu_ops, s, 424 TYPE_ASPEED_SCU, SCU_IO_REGION_SIZE); 425 426 sysbus_init_mmio(sbd, &s->iomem); 427 } 428 429 static const VMStateDescription vmstate_aspeed_scu = { 430 .name = "aspeed.scu", 431 .version_id = 1, 432 .minimum_version_id = 1, 433 .fields = (VMStateField[]) { 434 VMSTATE_UINT32_ARRAY(regs, AspeedSCUState, ASPEED_SCU_NR_REGS), 435 VMSTATE_END_OF_LIST() 436 } 437 }; 438 439 static Property aspeed_scu_properties[] = { 440 DEFINE_PROP_UINT32("silicon-rev", AspeedSCUState, silicon_rev, 0), 441 DEFINE_PROP_UINT32("hw-strap1", AspeedSCUState, hw_strap1, 0), 442 DEFINE_PROP_UINT32("hw-strap2", AspeedSCUState, hw_strap2, 0), 443 DEFINE_PROP_UINT32("hw-prot-key", AspeedSCUState, hw_prot_key, 0), 444 DEFINE_PROP_END_OF_LIST(), 445 }; 446 447 static void aspeed_scu_class_init(ObjectClass *klass, void *data) 448 { 449 DeviceClass *dc = DEVICE_CLASS(klass); 450 dc->realize = aspeed_scu_realize; 451 dc->reset = aspeed_scu_reset; 452 dc->desc = "ASPEED System Control Unit"; 453 dc->vmsd = &vmstate_aspeed_scu; 454 dc->props = aspeed_scu_properties; 455 } 456 457 static const TypeInfo aspeed_scu_info = { 458 .name = TYPE_ASPEED_SCU, 459 .parent = TYPE_SYS_BUS_DEVICE, 460 .instance_size = sizeof(AspeedSCUState), 461 .class_init = aspeed_scu_class_init, 462 }; 463 464 static void aspeed_scu_register_types(void) 465 { 466 type_register_static(&aspeed_scu_info); 467 } 468 469 type_init(aspeed_scu_register_types); 470