1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Support for V3 Semiconductor PCI Local Bus to PCI Bridge 4 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org> 5 * 6 * Based on the code from arch/arm/mach-integrator/pci_v3.c 7 * Copyright (C) 1999 ARM Limited 8 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd 9 * 10 * Contributors to the old driver include: 11 * Russell King <linux@armlinux.org.uk> 12 * David A. Rusling <david.rusling@linaro.org> (uHAL, ARM Firmware suite) 13 * Rob Herring <robh@kernel.org> 14 * Liviu Dudau <Liviu.Dudau@arm.com> 15 * Grant Likely <grant.likely@secretlab.ca> 16 * Arnd Bergmann <arnd@arndb.de> 17 * Bjorn Helgaas <bhelgaas@google.com> 18 */ 19 #include <linux/init.h> 20 #include <linux/interrupt.h> 21 #include <linux/io.h> 22 #include <linux/kernel.h> 23 #include <linux/of_address.h> 24 #include <linux/of_device.h> 25 #include <linux/of_irq.h> 26 #include <linux/of_pci.h> 27 #include <linux/pci.h> 28 #include <linux/platform_device.h> 29 #include <linux/slab.h> 30 #include <linux/bitops.h> 31 #include <linux/irq.h> 32 #include <linux/mfd/syscon.h> 33 #include <linux/regmap.h> 34 #include <linux/clk.h> 35 36 #include "../pci.h" 37 38 #define V3_PCI_VENDOR 0x00000000 39 #define V3_PCI_DEVICE 0x00000002 40 #define V3_PCI_CMD 0x00000004 41 #define V3_PCI_STAT 0x00000006 42 #define V3_PCI_CC_REV 0x00000008 43 #define V3_PCI_HDR_CFG 0x0000000C 44 #define V3_PCI_IO_BASE 0x00000010 45 #define V3_PCI_BASE0 0x00000014 46 #define V3_PCI_BASE1 0x00000018 47 #define V3_PCI_SUB_VENDOR 0x0000002C 48 #define V3_PCI_SUB_ID 0x0000002E 49 #define V3_PCI_ROM 0x00000030 50 #define V3_PCI_BPARAM 0x0000003C 51 #define V3_PCI_MAP0 0x00000040 52 #define V3_PCI_MAP1 0x00000044 53 #define V3_PCI_INT_STAT 0x00000048 54 #define V3_PCI_INT_CFG 0x0000004C 55 #define V3_LB_BASE0 0x00000054 56 #define V3_LB_BASE1 0x00000058 57 #define V3_LB_MAP0 0x0000005E 58 #define V3_LB_MAP1 0x00000062 59 #define V3_LB_BASE2 0x00000064 60 #define V3_LB_MAP2 0x00000066 61 #define V3_LB_SIZE 0x00000068 62 #define V3_LB_IO_BASE 0x0000006E 63 #define V3_FIFO_CFG 0x00000070 64 #define V3_FIFO_PRIORITY 0x00000072 65 #define V3_FIFO_STAT 0x00000074 66 #define V3_LB_ISTAT 0x00000076 67 #define V3_LB_IMASK 0x00000077 68 #define V3_SYSTEM 0x00000078 69 #define V3_LB_CFG 0x0000007A 70 #define V3_PCI_CFG 0x0000007C 71 #define V3_DMA_PCI_ADR0 0x00000080 72 #define V3_DMA_PCI_ADR1 0x00000090 73 #define V3_DMA_LOCAL_ADR0 0x00000084 74 #define V3_DMA_LOCAL_ADR1 0x00000094 75 #define V3_DMA_LENGTH0 0x00000088 76 #define V3_DMA_LENGTH1 0x00000098 77 #define V3_DMA_CSR0 0x0000008B 78 #define V3_DMA_CSR1 0x0000009B 79 #define V3_DMA_CTLB_ADR0 0x0000008C 80 #define V3_DMA_CTLB_ADR1 0x0000009C 81 #define V3_DMA_DELAY 0x000000E0 82 #define V3_MAIL_DATA 0x000000C0 83 #define V3_PCI_MAIL_IEWR 0x000000D0 84 #define V3_PCI_MAIL_IERD 0x000000D2 85 #define V3_LB_MAIL_IEWR 0x000000D4 86 #define V3_LB_MAIL_IERD 0x000000D6 87 #define V3_MAIL_WR_STAT 0x000000D8 88 #define V3_MAIL_RD_STAT 0x000000DA 89 #define V3_QBA_MAP 0x000000DC 90 91 /* PCI STATUS bits */ 92 #define V3_PCI_STAT_PAR_ERR BIT(15) 93 #define V3_PCI_STAT_SYS_ERR BIT(14) 94 #define V3_PCI_STAT_M_ABORT_ERR BIT(13) 95 #define V3_PCI_STAT_T_ABORT_ERR BIT(12) 96 97 /* LB ISTAT bits */ 98 #define V3_LB_ISTAT_MAILBOX BIT(7) 99 #define V3_LB_ISTAT_PCI_RD BIT(6) 100 #define V3_LB_ISTAT_PCI_WR BIT(5) 101 #define V3_LB_ISTAT_PCI_INT BIT(4) 102 #define V3_LB_ISTAT_PCI_PERR BIT(3) 103 #define V3_LB_ISTAT_I2O_QWR BIT(2) 104 #define V3_LB_ISTAT_DMA1 BIT(1) 105 #define V3_LB_ISTAT_DMA0 BIT(0) 106 107 /* PCI COMMAND bits */ 108 #define V3_COMMAND_M_FBB_EN BIT(9) 109 #define V3_COMMAND_M_SERR_EN BIT(8) 110 #define V3_COMMAND_M_PAR_EN BIT(6) 111 #define V3_COMMAND_M_MASTER_EN BIT(2) 112 #define V3_COMMAND_M_MEM_EN BIT(1) 113 #define V3_COMMAND_M_IO_EN BIT(0) 114 115 /* SYSTEM bits */ 116 #define V3_SYSTEM_M_RST_OUT BIT(15) 117 #define V3_SYSTEM_M_LOCK BIT(14) 118 #define V3_SYSTEM_UNLOCK 0xa05f 119 120 /* PCI CFG bits */ 121 #define V3_PCI_CFG_M_I2O_EN BIT(15) 122 #define V3_PCI_CFG_M_IO_REG_DIS BIT(14) 123 #define V3_PCI_CFG_M_IO_DIS BIT(13) 124 #define V3_PCI_CFG_M_EN3V BIT(12) 125 #define V3_PCI_CFG_M_RETRY_EN BIT(10) 126 #define V3_PCI_CFG_M_AD_LOW1 BIT(9) 127 #define V3_PCI_CFG_M_AD_LOW0 BIT(8) 128 /* 129 * This is the value applied to C/BE[3:1], with bit 0 always held 0 130 * during DMA access. 131 */ 132 #define V3_PCI_CFG_M_RTYPE_SHIFT 5 133 #define V3_PCI_CFG_M_WTYPE_SHIFT 1 134 #define V3_PCI_CFG_TYPE_DEFAULT 0x3 135 136 /* PCI BASE bits (PCI -> Local Bus) */ 137 #define V3_PCI_BASE_M_ADR_BASE 0xFFF00000U 138 #define V3_PCI_BASE_M_ADR_BASEL 0x000FFF00U 139 #define V3_PCI_BASE_M_PREFETCH BIT(3) 140 #define V3_PCI_BASE_M_TYPE (3 << 1) 141 #define V3_PCI_BASE_M_IO BIT(0) 142 143 /* PCI MAP bits (PCI -> Local bus) */ 144 #define V3_PCI_MAP_M_MAP_ADR 0xFFF00000U 145 #define V3_PCI_MAP_M_RD_POST_INH BIT(15) 146 #define V3_PCI_MAP_M_ROM_SIZE (3 << 10) 147 #define V3_PCI_MAP_M_SWAP (3 << 8) 148 #define V3_PCI_MAP_M_ADR_SIZE 0x000000F0U 149 #define V3_PCI_MAP_M_REG_EN BIT(1) 150 #define V3_PCI_MAP_M_ENABLE BIT(0) 151 152 /* LB_BASE0,1 bits (Local bus -> PCI) */ 153 #define V3_LB_BASE_ADR_BASE 0xfff00000U 154 #define V3_LB_BASE_SWAP (3 << 8) 155 #define V3_LB_BASE_ADR_SIZE (15 << 4) 156 #define V3_LB_BASE_PREFETCH BIT(3) 157 #define V3_LB_BASE_ENABLE BIT(0) 158 159 #define V3_LB_BASE_ADR_SIZE_1MB (0 << 4) 160 #define V3_LB_BASE_ADR_SIZE_2MB (1 << 4) 161 #define V3_LB_BASE_ADR_SIZE_4MB (2 << 4) 162 #define V3_LB_BASE_ADR_SIZE_8MB (3 << 4) 163 #define V3_LB_BASE_ADR_SIZE_16MB (4 << 4) 164 #define V3_LB_BASE_ADR_SIZE_32MB (5 << 4) 165 #define V3_LB_BASE_ADR_SIZE_64MB (6 << 4) 166 #define V3_LB_BASE_ADR_SIZE_128MB (7 << 4) 167 #define V3_LB_BASE_ADR_SIZE_256MB (8 << 4) 168 #define V3_LB_BASE_ADR_SIZE_512MB (9 << 4) 169 #define V3_LB_BASE_ADR_SIZE_1GB (10 << 4) 170 #define V3_LB_BASE_ADR_SIZE_2GB (11 << 4) 171 172 #define v3_addr_to_lb_base(a) ((a) & V3_LB_BASE_ADR_BASE) 173 174 /* LB_MAP0,1 bits (Local bus -> PCI) */ 175 #define V3_LB_MAP_MAP_ADR 0xfff0U 176 #define V3_LB_MAP_TYPE (7 << 1) 177 #define V3_LB_MAP_AD_LOW_EN BIT(0) 178 179 #define V3_LB_MAP_TYPE_IACK (0 << 1) 180 #define V3_LB_MAP_TYPE_IO (1 << 1) 181 #define V3_LB_MAP_TYPE_MEM (3 << 1) 182 #define V3_LB_MAP_TYPE_CONFIG (5 << 1) 183 #define V3_LB_MAP_TYPE_MEM_MULTIPLE (6 << 1) 184 185 #define v3_addr_to_lb_map(a) (((a) >> 16) & V3_LB_MAP_MAP_ADR) 186 187 /* LB_BASE2 bits (Local bus -> PCI IO) */ 188 #define V3_LB_BASE2_ADR_BASE 0xff00U 189 #define V3_LB_BASE2_SWAP_AUTO (3 << 6) 190 #define V3_LB_BASE2_ENABLE BIT(0) 191 192 #define v3_addr_to_lb_base2(a) (((a) >> 16) & V3_LB_BASE2_ADR_BASE) 193 194 /* LB_MAP2 bits (Local bus -> PCI IO) */ 195 #define V3_LB_MAP2_MAP_ADR 0xff00U 196 197 #define v3_addr_to_lb_map2(a) (((a) >> 16) & V3_LB_MAP2_MAP_ADR) 198 199 /* FIFO priority bits */ 200 #define V3_FIFO_PRIO_LOCAL BIT(12) 201 #define V3_FIFO_PRIO_LB_RD1_FLUSH_EOB BIT(10) 202 #define V3_FIFO_PRIO_LB_RD1_FLUSH_AP1 BIT(11) 203 #define V3_FIFO_PRIO_LB_RD1_FLUSH_ANY (BIT(10)|BIT(11)) 204 #define V3_FIFO_PRIO_LB_RD0_FLUSH_EOB BIT(8) 205 #define V3_FIFO_PRIO_LB_RD0_FLUSH_AP1 BIT(9) 206 #define V3_FIFO_PRIO_LB_RD0_FLUSH_ANY (BIT(8)|BIT(9)) 207 #define V3_FIFO_PRIO_PCI BIT(4) 208 #define V3_FIFO_PRIO_PCI_RD1_FLUSH_EOB BIT(2) 209 #define V3_FIFO_PRIO_PCI_RD1_FLUSH_AP1 BIT(3) 210 #define V3_FIFO_PRIO_PCI_RD1_FLUSH_ANY (BIT(2)|BIT(3)) 211 #define V3_FIFO_PRIO_PCI_RD0_FLUSH_EOB BIT(0) 212 #define V3_FIFO_PRIO_PCI_RD0_FLUSH_AP1 BIT(1) 213 #define V3_FIFO_PRIO_PCI_RD0_FLUSH_ANY (BIT(0)|BIT(1)) 214 215 /* Local bus configuration bits */ 216 #define V3_LB_CFG_LB_TO_64_CYCLES 0x0000 217 #define V3_LB_CFG_LB_TO_256_CYCLES BIT(13) 218 #define V3_LB_CFG_LB_TO_512_CYCLES BIT(14) 219 #define V3_LB_CFG_LB_TO_1024_CYCLES (BIT(13)|BIT(14)) 220 #define V3_LB_CFG_LB_RST BIT(12) 221 #define V3_LB_CFG_LB_PPC_RDY BIT(11) 222 #define V3_LB_CFG_LB_LB_INT BIT(10) 223 #define V3_LB_CFG_LB_ERR_EN BIT(9) 224 #define V3_LB_CFG_LB_RDY_EN BIT(8) 225 #define V3_LB_CFG_LB_BE_IMODE BIT(7) 226 #define V3_LB_CFG_LB_BE_OMODE BIT(6) 227 #define V3_LB_CFG_LB_ENDIAN BIT(5) 228 #define V3_LB_CFG_LB_PARK_EN BIT(4) 229 #define V3_LB_CFG_LB_FBB_DIS BIT(2) 230 231 /* ARM Integrator-specific extended control registers */ 232 #define INTEGRATOR_SC_PCI_OFFSET 0x18 233 #define INTEGRATOR_SC_PCI_ENABLE BIT(0) 234 #define INTEGRATOR_SC_PCI_INTCLR BIT(1) 235 #define INTEGRATOR_SC_LBFADDR_OFFSET 0x20 236 #define INTEGRATOR_SC_LBFCODE_OFFSET 0x24 237 238 struct v3_pci { 239 struct device *dev; 240 void __iomem *base; 241 void __iomem *config_base; 242 struct pci_bus *bus; 243 u32 config_mem; 244 u32 io_mem; 245 u32 non_pre_mem; 246 u32 pre_mem; 247 phys_addr_t io_bus_addr; 248 phys_addr_t non_pre_bus_addr; 249 phys_addr_t pre_bus_addr; 250 struct regmap *map; 251 }; 252 253 /* 254 * The V3 PCI interface chip in Integrator provides several windows from 255 * local bus memory into the PCI memory areas. Unfortunately, there 256 * are not really enough windows for our usage, therefore we reuse 257 * one of the windows for access to PCI configuration space. On the 258 * Integrator/AP, the memory map is as follows: 259 * 260 * Local Bus Memory Usage 261 * 262 * 40000000 - 4FFFFFFF PCI memory. 256M non-prefetchable 263 * 50000000 - 5FFFFFFF PCI memory. 256M prefetchable 264 * 60000000 - 60FFFFFF PCI IO. 16M 265 * 61000000 - 61FFFFFF PCI Configuration. 16M 266 * 267 * There are three V3 windows, each described by a pair of V3 registers. 268 * These are LB_BASE0/LB_MAP0, LB_BASE1/LB_MAP1 and LB_BASE2/LB_MAP2. 269 * Base0 and Base1 can be used for any type of PCI memory access. Base2 270 * can be used either for PCI I/O or for I20 accesses. By default, uHAL 271 * uses this only for PCI IO space. 272 * 273 * Normally these spaces are mapped using the following base registers: 274 * 275 * Usage Local Bus Memory Base/Map registers used 276 * 277 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0 278 * Mem 50000000 - 5FFFFFFF LB_BASE1/LB_MAP1 279 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2 280 * Cfg 61000000 - 61FFFFFF 281 * 282 * This means that I20 and PCI configuration space accesses will fail. 283 * When PCI configuration accesses are needed (via the uHAL PCI 284 * configuration space primitives) we must remap the spaces as follows: 285 * 286 * Usage Local Bus Memory Base/Map registers used 287 * 288 * Mem 40000000 - 4FFFFFFF LB_BASE0/LB_MAP0 289 * Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0 290 * IO 60000000 - 60FFFFFF LB_BASE2/LB_MAP2 291 * Cfg 61000000 - 61FFFFFF LB_BASE1/LB_MAP1 292 * 293 * To make this work, the code depends on overlapping windows working. 294 * The V3 chip translates an address by checking its range within 295 * each of the BASE/MAP pairs in turn (in ascending register number 296 * order). It will use the first matching pair. So, for example, 297 * if the same address is mapped by both LB_BASE0/LB_MAP0 and 298 * LB_BASE1/LB_MAP1, the V3 will use the translation from 299 * LB_BASE0/LB_MAP0. 300 * 301 * To allow PCI Configuration space access, the code enlarges the 302 * window mapped by LB_BASE0/LB_MAP0 from 256M to 512M. This occludes 303 * the windows currently mapped by LB_BASE1/LB_MAP1 so that it can 304 * be remapped for use by configuration cycles. 305 * 306 * At the end of the PCI Configuration space accesses, 307 * LB_BASE1/LB_MAP1 is reset to map PCI Memory. Finally the window 308 * mapped by LB_BASE0/LB_MAP0 is reduced in size from 512M to 256M to 309 * reveal the now restored LB_BASE1/LB_MAP1 window. 310 * 311 * NOTE: We do not set up I2O mapping. I suspect that this is only 312 * for an intelligent (target) device. Using I2O disables most of 313 * the mappings into PCI memory. 314 */ 315 static void __iomem *v3_map_bus(struct pci_bus *bus, 316 unsigned int devfn, int offset) 317 { 318 struct v3_pci *v3 = bus->sysdata; 319 unsigned int address, mapaddress, busnr; 320 321 busnr = bus->number; 322 if (busnr == 0) { 323 int slot = PCI_SLOT(devfn); 324 325 /* 326 * local bus segment so need a type 0 config cycle 327 * 328 * build the PCI configuration "address" with one-hot in 329 * A31-A11 330 * 331 * mapaddress: 332 * 3:1 = config cycle (101) 333 * 0 = PCI A1 & A0 are 0 (0) 334 */ 335 address = PCI_FUNC(devfn) << 8; 336 mapaddress = V3_LB_MAP_TYPE_CONFIG; 337 338 if (slot > 12) 339 /* 340 * high order bits are handled by the MAP register 341 */ 342 mapaddress |= BIT(slot - 5); 343 else 344 /* 345 * low order bits handled directly in the address 346 */ 347 address |= BIT(slot + 11); 348 } else { 349 /* 350 * not the local bus segment so need a type 1 config cycle 351 * 352 * address: 353 * 23:16 = bus number 354 * 15:11 = slot number (7:3 of devfn) 355 * 10:8 = func number (2:0 of devfn) 356 * 357 * mapaddress: 358 * 3:1 = config cycle (101) 359 * 0 = PCI A1 & A0 from host bus (1) 360 */ 361 mapaddress = V3_LB_MAP_TYPE_CONFIG | V3_LB_MAP_AD_LOW_EN; 362 address = (busnr << 16) | (devfn << 8); 363 } 364 365 /* 366 * Set up base0 to see all 512Mbytes of memory space (not 367 * prefetchable), this frees up base1 for re-use by 368 * configuration memory 369 */ 370 writel(v3_addr_to_lb_base(v3->non_pre_mem) | 371 V3_LB_BASE_ADR_SIZE_512MB | V3_LB_BASE_ENABLE, 372 v3->base + V3_LB_BASE0); 373 374 /* 375 * Set up base1/map1 to point into configuration space. 376 * The config mem is always 16MB. 377 */ 378 writel(v3_addr_to_lb_base(v3->config_mem) | 379 V3_LB_BASE_ADR_SIZE_16MB | V3_LB_BASE_ENABLE, 380 v3->base + V3_LB_BASE1); 381 writew(mapaddress, v3->base + V3_LB_MAP1); 382 383 return v3->config_base + address + offset; 384 } 385 386 static void v3_unmap_bus(struct v3_pci *v3) 387 { 388 /* 389 * Reassign base1 for use by prefetchable PCI memory 390 */ 391 writel(v3_addr_to_lb_base(v3->pre_mem) | 392 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_PREFETCH | 393 V3_LB_BASE_ENABLE, 394 v3->base + V3_LB_BASE1); 395 writew(v3_addr_to_lb_map(v3->pre_bus_addr) | 396 V3_LB_MAP_TYPE_MEM, /* was V3_LB_MAP_TYPE_MEM_MULTIPLE */ 397 v3->base + V3_LB_MAP1); 398 399 /* 400 * And shrink base0 back to a 256M window (NOTE: MAP0 already correct) 401 */ 402 writel(v3_addr_to_lb_base(v3->non_pre_mem) | 403 V3_LB_BASE_ADR_SIZE_256MB | V3_LB_BASE_ENABLE, 404 v3->base + V3_LB_BASE0); 405 } 406 407 static int v3_pci_read_config(struct pci_bus *bus, unsigned int fn, 408 int config, int size, u32 *value) 409 { 410 struct v3_pci *v3 = bus->sysdata; 411 int ret; 412 413 dev_dbg(&bus->dev, 414 "[read] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n", 415 PCI_SLOT(fn), PCI_FUNC(fn), config, size, *value); 416 ret = pci_generic_config_read(bus, fn, config, size, value); 417 v3_unmap_bus(v3); 418 return ret; 419 } 420 421 static int v3_pci_write_config(struct pci_bus *bus, unsigned int fn, 422 int config, int size, u32 value) 423 { 424 struct v3_pci *v3 = bus->sysdata; 425 int ret; 426 427 dev_dbg(&bus->dev, 428 "[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n", 429 PCI_SLOT(fn), PCI_FUNC(fn), config, size, value); 430 ret = pci_generic_config_write(bus, fn, config, size, value); 431 v3_unmap_bus(v3); 432 return ret; 433 } 434 435 static struct pci_ops v3_pci_ops = { 436 .map_bus = v3_map_bus, 437 .read = v3_pci_read_config, 438 .write = v3_pci_write_config, 439 }; 440 441 static irqreturn_t v3_irq(int irq, void *data) 442 { 443 struct v3_pci *v3 = data; 444 struct device *dev = v3->dev; 445 u32 status; 446 447 status = readw(v3->base + V3_PCI_STAT); 448 if (status & V3_PCI_STAT_PAR_ERR) 449 dev_err(dev, "parity error interrupt\n"); 450 if (status & V3_PCI_STAT_SYS_ERR) 451 dev_err(dev, "system error interrupt\n"); 452 if (status & V3_PCI_STAT_M_ABORT_ERR) 453 dev_err(dev, "master abort error interrupt\n"); 454 if (status & V3_PCI_STAT_T_ABORT_ERR) 455 dev_err(dev, "target abort error interrupt\n"); 456 writew(status, v3->base + V3_PCI_STAT); 457 458 status = readb(v3->base + V3_LB_ISTAT); 459 if (status & V3_LB_ISTAT_MAILBOX) 460 dev_info(dev, "PCI mailbox interrupt\n"); 461 if (status & V3_LB_ISTAT_PCI_RD) 462 dev_err(dev, "PCI target LB->PCI READ abort interrupt\n"); 463 if (status & V3_LB_ISTAT_PCI_WR) 464 dev_err(dev, "PCI target LB->PCI WRITE abort interrupt\n"); 465 if (status & V3_LB_ISTAT_PCI_INT) 466 dev_info(dev, "PCI pin interrupt\n"); 467 if (status & V3_LB_ISTAT_PCI_PERR) 468 dev_err(dev, "PCI parity error interrupt\n"); 469 if (status & V3_LB_ISTAT_I2O_QWR) 470 dev_info(dev, "I2O inbound post queue interrupt\n"); 471 if (status & V3_LB_ISTAT_DMA1) 472 dev_info(dev, "DMA channel 1 interrupt\n"); 473 if (status & V3_LB_ISTAT_DMA0) 474 dev_info(dev, "DMA channel 0 interrupt\n"); 475 /* Clear all possible interrupts on the local bus */ 476 writeb(0, v3->base + V3_LB_ISTAT); 477 if (v3->map) 478 regmap_write(v3->map, INTEGRATOR_SC_PCI_OFFSET, 479 INTEGRATOR_SC_PCI_ENABLE | 480 INTEGRATOR_SC_PCI_INTCLR); 481 482 return IRQ_HANDLED; 483 } 484 485 static int v3_integrator_init(struct v3_pci *v3) 486 { 487 unsigned int val; 488 489 v3->map = 490 syscon_regmap_lookup_by_compatible("arm,integrator-ap-syscon"); 491 if (IS_ERR(v3->map)) { 492 dev_err(v3->dev, "no syscon\n"); 493 return -ENODEV; 494 } 495 496 regmap_read(v3->map, INTEGRATOR_SC_PCI_OFFSET, &val); 497 /* Take the PCI bridge out of reset, clear IRQs */ 498 regmap_write(v3->map, INTEGRATOR_SC_PCI_OFFSET, 499 INTEGRATOR_SC_PCI_ENABLE | 500 INTEGRATOR_SC_PCI_INTCLR); 501 502 if (!(val & INTEGRATOR_SC_PCI_ENABLE)) { 503 /* If we were in reset we need to sleep a bit */ 504 msleep(230); 505 506 /* Set the physical base for the controller itself */ 507 writel(0x6200, v3->base + V3_LB_IO_BASE); 508 509 /* Wait for the mailbox to settle after reset */ 510 do { 511 writeb(0xaa, v3->base + V3_MAIL_DATA); 512 writeb(0x55, v3->base + V3_MAIL_DATA + 4); 513 } while (readb(v3->base + V3_MAIL_DATA) != 0xaa && 514 readb(v3->base + V3_MAIL_DATA) != 0x55); 515 } 516 517 dev_info(v3->dev, "initialized PCI V3 Integrator/AP integration\n"); 518 519 return 0; 520 } 521 522 static int v3_pci_setup_resource(struct v3_pci *v3, 523 resource_size_t io_base, 524 struct pci_host_bridge *host, 525 struct resource_entry *win) 526 { 527 struct device *dev = v3->dev; 528 struct resource *mem; 529 struct resource *io; 530 int ret; 531 532 switch (resource_type(win->res)) { 533 case IORESOURCE_IO: 534 io = win->res; 535 io->name = "V3 PCI I/O"; 536 v3->io_mem = io_base; 537 v3->io_bus_addr = io->start - win->offset; 538 dev_dbg(dev, "I/O window %pR, bus addr %pap\n", 539 io, &v3->io_bus_addr); 540 ret = pci_remap_iospace(io, io_base); 541 if (ret) { 542 dev_warn(dev, 543 "error %d: failed to map resource %pR\n", 544 ret, io); 545 return ret; 546 } 547 /* Setup window 2 - PCI I/O */ 548 writel(v3_addr_to_lb_base2(v3->io_mem) | 549 V3_LB_BASE2_ENABLE, 550 v3->base + V3_LB_BASE2); 551 writew(v3_addr_to_lb_map2(v3->io_bus_addr), 552 v3->base + V3_LB_MAP2); 553 break; 554 case IORESOURCE_MEM: 555 mem = win->res; 556 if (mem->flags & IORESOURCE_PREFETCH) { 557 mem->name = "V3 PCI PRE-MEM"; 558 v3->pre_mem = mem->start; 559 v3->pre_bus_addr = mem->start - win->offset; 560 dev_dbg(dev, "PREFETCHABLE MEM window %pR, bus addr %pap\n", 561 mem, &v3->pre_bus_addr); 562 if (resource_size(mem) != SZ_256M) { 563 dev_err(dev, "prefetchable memory range is not 256MB\n"); 564 return -EINVAL; 565 } 566 if (v3->non_pre_mem && 567 (mem->start != v3->non_pre_mem + SZ_256M)) { 568 dev_err(dev, 569 "prefetchable memory is not adjacent to non-prefetchable memory\n"); 570 return -EINVAL; 571 } 572 /* Setup window 1 - PCI prefetchable memory */ 573 writel(v3_addr_to_lb_base(v3->pre_mem) | 574 V3_LB_BASE_ADR_SIZE_256MB | 575 V3_LB_BASE_PREFETCH | 576 V3_LB_BASE_ENABLE, 577 v3->base + V3_LB_BASE1); 578 writew(v3_addr_to_lb_map(v3->pre_bus_addr) | 579 V3_LB_MAP_TYPE_MEM, /* Was V3_LB_MAP_TYPE_MEM_MULTIPLE */ 580 v3->base + V3_LB_MAP1); 581 } else { 582 mem->name = "V3 PCI NON-PRE-MEM"; 583 v3->non_pre_mem = mem->start; 584 v3->non_pre_bus_addr = mem->start - win->offset; 585 dev_dbg(dev, "NON-PREFETCHABLE MEM window %pR, bus addr %pap\n", 586 mem, &v3->non_pre_bus_addr); 587 if (resource_size(mem) != SZ_256M) { 588 dev_err(dev, 589 "non-prefetchable memory range is not 256MB\n"); 590 return -EINVAL; 591 } 592 /* Setup window 0 - PCI non-prefetchable memory */ 593 writel(v3_addr_to_lb_base(v3->non_pre_mem) | 594 V3_LB_BASE_ADR_SIZE_256MB | 595 V3_LB_BASE_ENABLE, 596 v3->base + V3_LB_BASE0); 597 writew(v3_addr_to_lb_map(v3->non_pre_bus_addr) | 598 V3_LB_MAP_TYPE_MEM, 599 v3->base + V3_LB_MAP0); 600 } 601 break; 602 case IORESOURCE_BUS: 603 dev_dbg(dev, "BUS %pR\n", win->res); 604 host->busnr = win->res->start; 605 break; 606 default: 607 dev_info(dev, "Unknown resource type %lu\n", 608 resource_type(win->res)); 609 break; 610 } 611 612 return 0; 613 } 614 615 static int v3_get_dma_range_config(struct v3_pci *v3, 616 struct of_pci_range *range, 617 u32 *pci_base, u32 *pci_map) 618 { 619 struct device *dev = v3->dev; 620 u64 cpu_end = range->cpu_addr + range->size - 1; 621 u64 pci_end = range->pci_addr + range->size - 1; 622 u32 val; 623 624 if (range->pci_addr & ~V3_PCI_BASE_M_ADR_BASE) { 625 dev_err(dev, "illegal range, only PCI bits 31..20 allowed\n"); 626 return -EINVAL; 627 } 628 val = ((u32)range->pci_addr) & V3_PCI_BASE_M_ADR_BASE; 629 *pci_base = val; 630 631 if (range->cpu_addr & ~V3_PCI_MAP_M_MAP_ADR) { 632 dev_err(dev, "illegal range, only CPU bits 31..20 allowed\n"); 633 return -EINVAL; 634 } 635 val = ((u32)range->cpu_addr) & V3_PCI_MAP_M_MAP_ADR; 636 637 switch (range->size) { 638 case SZ_1M: 639 val |= V3_LB_BASE_ADR_SIZE_1MB; 640 break; 641 case SZ_2M: 642 val |= V3_LB_BASE_ADR_SIZE_2MB; 643 break; 644 case SZ_4M: 645 val |= V3_LB_BASE_ADR_SIZE_4MB; 646 break; 647 case SZ_8M: 648 val |= V3_LB_BASE_ADR_SIZE_8MB; 649 break; 650 case SZ_16M: 651 val |= V3_LB_BASE_ADR_SIZE_16MB; 652 break; 653 case SZ_32M: 654 val |= V3_LB_BASE_ADR_SIZE_32MB; 655 break; 656 case SZ_64M: 657 val |= V3_LB_BASE_ADR_SIZE_64MB; 658 break; 659 case SZ_128M: 660 val |= V3_LB_BASE_ADR_SIZE_128MB; 661 break; 662 case SZ_256M: 663 val |= V3_LB_BASE_ADR_SIZE_256MB; 664 break; 665 case SZ_512M: 666 val |= V3_LB_BASE_ADR_SIZE_512MB; 667 break; 668 case SZ_1G: 669 val |= V3_LB_BASE_ADR_SIZE_1GB; 670 break; 671 case SZ_2G: 672 val |= V3_LB_BASE_ADR_SIZE_2GB; 673 break; 674 default: 675 dev_err(v3->dev, "illegal dma memory chunk size\n"); 676 return -EINVAL; 677 break; 678 } 679 val |= V3_PCI_MAP_M_REG_EN | V3_PCI_MAP_M_ENABLE; 680 *pci_map = val; 681 682 dev_dbg(dev, 683 "DMA MEM CPU: 0x%016llx -> 0x%016llx => " 684 "PCI: 0x%016llx -> 0x%016llx base %08x map %08x\n", 685 range->cpu_addr, cpu_end, 686 range->pci_addr, pci_end, 687 *pci_base, *pci_map); 688 689 return 0; 690 } 691 692 static int v3_pci_parse_map_dma_ranges(struct v3_pci *v3, 693 struct device_node *np) 694 { 695 struct of_pci_range range; 696 struct of_pci_range_parser parser; 697 struct device *dev = v3->dev; 698 int i = 0; 699 700 if (of_pci_dma_range_parser_init(&parser, np)) { 701 dev_err(dev, "missing dma-ranges property\n"); 702 return -EINVAL; 703 } 704 705 /* 706 * Get the dma-ranges from the device tree 707 */ 708 for_each_of_pci_range(&parser, &range) { 709 int ret; 710 u32 pci_base, pci_map; 711 712 ret = v3_get_dma_range_config(v3, &range, &pci_base, &pci_map); 713 if (ret) 714 return ret; 715 716 if (i == 0) { 717 writel(pci_base, v3->base + V3_PCI_BASE0); 718 writel(pci_map, v3->base + V3_PCI_MAP0); 719 } else if (i == 1) { 720 writel(pci_base, v3->base + V3_PCI_BASE1); 721 writel(pci_map, v3->base + V3_PCI_MAP1); 722 } else { 723 dev_err(dev, "too many ranges, only two supported\n"); 724 dev_err(dev, "range %d ignored\n", i); 725 } 726 i++; 727 } 728 return 0; 729 } 730 731 static int v3_pci_probe(struct platform_device *pdev) 732 { 733 struct device *dev = &pdev->dev; 734 struct device_node *np = dev->of_node; 735 resource_size_t io_base; 736 struct resource *regs; 737 struct resource_entry *win; 738 struct v3_pci *v3; 739 struct pci_host_bridge *host; 740 struct clk *clk; 741 u16 val; 742 int irq; 743 int ret; 744 LIST_HEAD(res); 745 746 host = pci_alloc_host_bridge(sizeof(*v3)); 747 if (!host) 748 return -ENOMEM; 749 750 host->dev.parent = dev; 751 host->ops = &v3_pci_ops; 752 host->busnr = 0; 753 host->msi = NULL; 754 host->map_irq = of_irq_parse_and_map_pci; 755 host->swizzle_irq = pci_common_swizzle; 756 v3 = pci_host_bridge_priv(host); 757 host->sysdata = v3; 758 v3->dev = dev; 759 760 /* Get and enable host clock */ 761 clk = devm_clk_get(dev, NULL); 762 if (IS_ERR(clk)) { 763 dev_err(dev, "clock not found\n"); 764 return PTR_ERR(clk); 765 } 766 ret = clk_prepare_enable(clk); 767 if (ret) { 768 dev_err(dev, "unable to enable clock\n"); 769 return ret; 770 } 771 772 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 773 v3->base = devm_ioremap_resource(dev, regs); 774 if (IS_ERR(v3->base)) 775 return PTR_ERR(v3->base); 776 /* 777 * The hardware has a register with the physical base address 778 * of the V3 controller itself, verify that this is the same 779 * as the physical memory we've remapped it from. 780 */ 781 if (readl(v3->base + V3_LB_IO_BASE) != (regs->start >> 16)) 782 dev_err(dev, "V3_LB_IO_BASE = %08x but device is @%pR\n", 783 readl(v3->base + V3_LB_IO_BASE), regs); 784 785 /* Configuration space is 16MB directly mapped */ 786 regs = platform_get_resource(pdev, IORESOURCE_MEM, 1); 787 if (resource_size(regs) != SZ_16M) { 788 dev_err(dev, "config mem is not 16MB!\n"); 789 return -EINVAL; 790 } 791 v3->config_mem = regs->start; 792 v3->config_base = devm_ioremap_resource(dev, regs); 793 if (IS_ERR(v3->config_base)) 794 return PTR_ERR(v3->config_base); 795 796 ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &res, 797 &io_base); 798 if (ret) 799 return ret; 800 801 ret = devm_request_pci_bus_resources(dev, &res); 802 if (ret) 803 return ret; 804 805 /* Get and request error IRQ resource */ 806 irq = platform_get_irq(pdev, 0); 807 if (irq <= 0) { 808 dev_err(dev, "unable to obtain PCIv3 error IRQ\n"); 809 return -ENODEV; 810 } 811 ret = devm_request_irq(dev, irq, v3_irq, 0, 812 "PCIv3 error", v3); 813 if (ret < 0) { 814 dev_err(dev, 815 "unable to request PCIv3 error IRQ %d (%d)\n", 816 irq, ret); 817 return ret; 818 } 819 820 /* 821 * Unlock V3 registers, but only if they were previously locked. 822 */ 823 if (readw(v3->base + V3_SYSTEM) & V3_SYSTEM_M_LOCK) 824 writew(V3_SYSTEM_UNLOCK, v3->base + V3_SYSTEM); 825 826 /* Disable all slave access while we set up the windows */ 827 val = readw(v3->base + V3_PCI_CMD); 828 val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); 829 writew(val, v3->base + V3_PCI_CMD); 830 831 /* Put the PCI bus into reset */ 832 val = readw(v3->base + V3_SYSTEM); 833 val &= ~V3_SYSTEM_M_RST_OUT; 834 writew(val, v3->base + V3_SYSTEM); 835 836 /* Retry until we're ready */ 837 val = readw(v3->base + V3_PCI_CFG); 838 val |= V3_PCI_CFG_M_RETRY_EN; 839 writew(val, v3->base + V3_PCI_CFG); 840 841 /* Set up the local bus protocol */ 842 val = readw(v3->base + V3_LB_CFG); 843 val |= V3_LB_CFG_LB_BE_IMODE; /* Byte enable input */ 844 val |= V3_LB_CFG_LB_BE_OMODE; /* Byte enable output */ 845 val &= ~V3_LB_CFG_LB_ENDIAN; /* Little endian */ 846 val &= ~V3_LB_CFG_LB_PPC_RDY; /* TODO: when using on PPC403Gx, set to 1 */ 847 writew(val, v3->base + V3_LB_CFG); 848 849 /* Enable the PCI bus master */ 850 val = readw(v3->base + V3_PCI_CMD); 851 val |= PCI_COMMAND_MASTER; 852 writew(val, v3->base + V3_PCI_CMD); 853 854 /* Get the I/O and memory ranges from DT */ 855 resource_list_for_each_entry(win, &res) { 856 ret = v3_pci_setup_resource(v3, io_base, host, win); 857 if (ret) { 858 dev_err(dev, "error setting up resources\n"); 859 return ret; 860 } 861 } 862 ret = v3_pci_parse_map_dma_ranges(v3, np); 863 if (ret) 864 return ret; 865 866 /* 867 * Disable PCI to host IO cycles, enable I/O buffers @3.3V, 868 * set AD_LOW0 to 1 if one of the LB_MAP registers choose 869 * to use this (should be unused). 870 */ 871 writel(0x00000000, v3->base + V3_PCI_IO_BASE); 872 val = V3_PCI_CFG_M_IO_REG_DIS | V3_PCI_CFG_M_IO_DIS | 873 V3_PCI_CFG_M_EN3V | V3_PCI_CFG_M_AD_LOW0; 874 /* 875 * DMA read and write from PCI bus commands types 876 */ 877 val |= V3_PCI_CFG_TYPE_DEFAULT << V3_PCI_CFG_M_RTYPE_SHIFT; 878 val |= V3_PCI_CFG_TYPE_DEFAULT << V3_PCI_CFG_M_WTYPE_SHIFT; 879 writew(val, v3->base + V3_PCI_CFG); 880 881 /* 882 * Set the V3 FIFO such that writes have higher priority than 883 * reads, and local bus write causes local bus read fifo flush 884 * on aperture 1. Same for PCI. 885 */ 886 writew(V3_FIFO_PRIO_LB_RD1_FLUSH_AP1 | 887 V3_FIFO_PRIO_LB_RD0_FLUSH_AP1 | 888 V3_FIFO_PRIO_PCI_RD1_FLUSH_AP1 | 889 V3_FIFO_PRIO_PCI_RD0_FLUSH_AP1, 890 v3->base + V3_FIFO_PRIORITY); 891 892 893 /* 894 * Clear any error interrupts, and enable parity and write error 895 * interrupts 896 */ 897 writeb(0, v3->base + V3_LB_ISTAT); 898 val = readw(v3->base + V3_LB_CFG); 899 val |= V3_LB_CFG_LB_LB_INT; 900 writew(val, v3->base + V3_LB_CFG); 901 writeb(V3_LB_ISTAT_PCI_WR | V3_LB_ISTAT_PCI_PERR, 902 v3->base + V3_LB_IMASK); 903 904 /* Special Integrator initialization */ 905 if (of_device_is_compatible(np, "arm,integrator-ap-pci")) { 906 ret = v3_integrator_init(v3); 907 if (ret) 908 return ret; 909 } 910 911 /* Post-init: enable PCI memory and invalidate (master already on) */ 912 val = readw(v3->base + V3_PCI_CMD); 913 val |= PCI_COMMAND_MEMORY | PCI_COMMAND_INVALIDATE; 914 writew(val, v3->base + V3_PCI_CMD); 915 916 /* Clear pending interrupts */ 917 writeb(0, v3->base + V3_LB_ISTAT); 918 /* Read or write errors and parity errors cause interrupts */ 919 writeb(V3_LB_ISTAT_PCI_RD | V3_LB_ISTAT_PCI_WR | V3_LB_ISTAT_PCI_PERR, 920 v3->base + V3_LB_IMASK); 921 922 /* Take the PCI bus out of reset so devices can initialize */ 923 val = readw(v3->base + V3_SYSTEM); 924 val |= V3_SYSTEM_M_RST_OUT; 925 writew(val, v3->base + V3_SYSTEM); 926 927 /* 928 * Re-lock the system register. 929 */ 930 val = readw(v3->base + V3_SYSTEM); 931 val |= V3_SYSTEM_M_LOCK; 932 writew(val, v3->base + V3_SYSTEM); 933 934 list_splice_init(&res, &host->windows); 935 ret = pci_scan_root_bus_bridge(host); 936 if (ret) { 937 dev_err(dev, "failed to register host: %d\n", ret); 938 return ret; 939 } 940 v3->bus = host->bus; 941 942 pci_bus_assign_resources(v3->bus); 943 pci_bus_add_devices(v3->bus); 944 945 return 0; 946 } 947 948 static const struct of_device_id v3_pci_of_match[] = { 949 { 950 .compatible = "v3,v360epc-pci", 951 }, 952 {}, 953 }; 954 955 static struct platform_driver v3_pci_driver = { 956 .driver = { 957 .name = "pci-v3-semi", 958 .of_match_table = of_match_ptr(v3_pci_of_match), 959 .suppress_bind_attrs = true, 960 }, 961 .probe = v3_pci_probe, 962 }; 963 builtin_platform_driver(v3_pci_driver); 964