1 /* 2 * PCI code for the Freescale MPC52xx embedded CPU. 3 * 4 * Copyright (C) 2006 Secret Lab Technologies Ltd. 5 * Grant Likely <grant.likely@secretlab.ca> 6 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com> 7 * 8 * This file is licensed under the terms of the GNU General Public License 9 * version 2. This program is licensed "as is" without any warranty of any 10 * kind, whether express or implied. 11 */ 12 13 #undef DEBUG 14 15 #include <asm/pci.h> 16 #include <asm/mpc52xx.h> 17 #include <asm/delay.h> 18 #include <asm/machdep.h> 19 #include <linux/kernel.h> 20 21 22 /* ======================================================================== */ 23 /* Structures mapping & Defines for PCI Unit */ 24 /* ======================================================================== */ 25 26 #define MPC52xx_PCI_GSCR_BM 0x40000000 27 #define MPC52xx_PCI_GSCR_PE 0x20000000 28 #define MPC52xx_PCI_GSCR_SE 0x10000000 29 #define MPC52xx_PCI_GSCR_XLB2PCI_MASK 0x07000000 30 #define MPC52xx_PCI_GSCR_XLB2PCI_SHIFT 24 31 #define MPC52xx_PCI_GSCR_IPG2PCI_MASK 0x00070000 32 #define MPC52xx_PCI_GSCR_IPG2PCI_SHIFT 16 33 #define MPC52xx_PCI_GSCR_BME 0x00004000 34 #define MPC52xx_PCI_GSCR_PEE 0x00002000 35 #define MPC52xx_PCI_GSCR_SEE 0x00001000 36 #define MPC52xx_PCI_GSCR_PR 0x00000001 37 38 39 #define MPC52xx_PCI_IWBTAR_TRANSLATION(proc_ad,pci_ad,size) \ 40 ( ( (proc_ad) & 0xff000000 ) | \ 41 ( (((size) - 1) >> 8) & 0x00ff0000 ) | \ 42 ( ((pci_ad) >> 16) & 0x0000ff00 ) ) 43 44 #define MPC52xx_PCI_IWCR_PACK(win0,win1,win2) (((win0) << 24) | \ 45 ((win1) << 16) | \ 46 ((win2) << 8)) 47 48 #define MPC52xx_PCI_IWCR_DISABLE 0x0 49 #define MPC52xx_PCI_IWCR_ENABLE 0x1 50 #define MPC52xx_PCI_IWCR_READ 0x0 51 #define MPC52xx_PCI_IWCR_READ_LINE 0x2 52 #define MPC52xx_PCI_IWCR_READ_MULTI 0x4 53 #define MPC52xx_PCI_IWCR_MEM 0x0 54 #define MPC52xx_PCI_IWCR_IO 0x8 55 56 #define MPC52xx_PCI_TCR_P 0x01000000 57 #define MPC52xx_PCI_TCR_LD 0x00010000 58 #define MPC52xx_PCI_TCR_WCT8 0x00000008 59 60 #define MPC52xx_PCI_TBATR_DISABLE 0x0 61 #define MPC52xx_PCI_TBATR_ENABLE 0x1 62 63 struct mpc52xx_pci { 64 u32 idr; /* PCI + 0x00 */ 65 u32 scr; /* PCI + 0x04 */ 66 u32 ccrir; /* PCI + 0x08 */ 67 u32 cr1; /* PCI + 0x0C */ 68 u32 bar0; /* PCI + 0x10 */ 69 u32 bar1; /* PCI + 0x14 */ 70 u8 reserved1[16]; /* PCI + 0x18 */ 71 u32 ccpr; /* PCI + 0x28 */ 72 u32 sid; /* PCI + 0x2C */ 73 u32 erbar; /* PCI + 0x30 */ 74 u32 cpr; /* PCI + 0x34 */ 75 u8 reserved2[4]; /* PCI + 0x38 */ 76 u32 cr2; /* PCI + 0x3C */ 77 u8 reserved3[32]; /* PCI + 0x40 */ 78 u32 gscr; /* PCI + 0x60 */ 79 u32 tbatr0; /* PCI + 0x64 */ 80 u32 tbatr1; /* PCI + 0x68 */ 81 u32 tcr; /* PCI + 0x6C */ 82 u32 iw0btar; /* PCI + 0x70 */ 83 u32 iw1btar; /* PCI + 0x74 */ 84 u32 iw2btar; /* PCI + 0x78 */ 85 u8 reserved4[4]; /* PCI + 0x7C */ 86 u32 iwcr; /* PCI + 0x80 */ 87 u32 icr; /* PCI + 0x84 */ 88 u32 isr; /* PCI + 0x88 */ 89 u32 arb; /* PCI + 0x8C */ 90 u8 reserved5[104]; /* PCI + 0x90 */ 91 u32 car; /* PCI + 0xF8 */ 92 u8 reserved6[4]; /* PCI + 0xFC */ 93 }; 94 95 /* MPC5200 device tree match tables */ 96 const struct of_device_id mpc52xx_pci_ids[] __initdata = { 97 { .type = "pci", .compatible = "fsl,mpc5200-pci", }, 98 { .type = "pci", .compatible = "mpc5200-pci", }, 99 {} 100 }; 101 102 /* ======================================================================== */ 103 /* PCI configuration access */ 104 /* ======================================================================== */ 105 106 static int 107 mpc52xx_pci_read_config(struct pci_bus *bus, unsigned int devfn, 108 int offset, int len, u32 *val) 109 { 110 struct pci_controller *hose = pci_bus_to_host(bus); 111 u32 value; 112 113 if (ppc_md.pci_exclude_device) 114 if (ppc_md.pci_exclude_device(hose, bus->number, devfn)) 115 return PCIBIOS_DEVICE_NOT_FOUND; 116 117 out_be32(hose->cfg_addr, 118 (1 << 31) | 119 (bus->number << 16) | 120 (devfn << 8) | 121 (offset & 0xfc)); 122 mb(); 123 124 #if defined(CONFIG_PPC_MPC5200_BUGFIX) 125 if (bus->number) { 126 /* workaround for the bug 435 of the MPC5200 (L25R); 127 * Don't do 32 bits config access during type-1 cycles */ 128 switch (len) { 129 case 1: 130 value = in_8(((u8 __iomem *)hose->cfg_data) + 131 (offset & 3)); 132 break; 133 case 2: 134 value = in_le16(((u16 __iomem *)hose->cfg_data) + 135 ((offset>>1) & 1)); 136 break; 137 138 default: 139 value = in_le16((u16 __iomem *)hose->cfg_data) | 140 (in_le16(((u16 __iomem *)hose->cfg_data) + 1) << 16); 141 break; 142 } 143 } 144 else 145 #endif 146 { 147 value = in_le32(hose->cfg_data); 148 149 if (len != 4) { 150 value >>= ((offset & 0x3) << 3); 151 value &= 0xffffffff >> (32 - (len << 3)); 152 } 153 } 154 155 *val = value; 156 157 out_be32(hose->cfg_addr, 0); 158 mb(); 159 160 return PCIBIOS_SUCCESSFUL; 161 } 162 163 static int 164 mpc52xx_pci_write_config(struct pci_bus *bus, unsigned int devfn, 165 int offset, int len, u32 val) 166 { 167 struct pci_controller *hose = pci_bus_to_host(bus); 168 u32 value, mask; 169 170 if (ppc_md.pci_exclude_device) 171 if (ppc_md.pci_exclude_device(hose, bus->number, devfn)) 172 return PCIBIOS_DEVICE_NOT_FOUND; 173 174 out_be32(hose->cfg_addr, 175 (1 << 31) | 176 (bus->number << 16) | 177 (devfn << 8) | 178 (offset & 0xfc)); 179 mb(); 180 181 #if defined(CONFIG_PPC_MPC5200_BUGFIX) 182 if (bus->number) { 183 /* workaround for the bug 435 of the MPC5200 (L25R); 184 * Don't do 32 bits config access during type-1 cycles */ 185 switch (len) { 186 case 1: 187 out_8(((u8 __iomem *)hose->cfg_data) + 188 (offset & 3), val); 189 break; 190 case 2: 191 out_le16(((u16 __iomem *)hose->cfg_data) + 192 ((offset>>1) & 1), val); 193 break; 194 195 default: 196 out_le16((u16 __iomem *)hose->cfg_data, 197 (u16)val); 198 out_le16(((u16 __iomem *)hose->cfg_data) + 1, 199 (u16)(val>>16)); 200 break; 201 } 202 } 203 else 204 #endif 205 { 206 if (len != 4) { 207 value = in_le32(hose->cfg_data); 208 209 offset = (offset & 0x3) << 3; 210 mask = (0xffffffff >> (32 - (len << 3))); 211 mask <<= offset; 212 213 value &= ~mask; 214 val = value | ((val << offset) & mask); 215 } 216 217 out_le32(hose->cfg_data, val); 218 } 219 mb(); 220 221 out_be32(hose->cfg_addr, 0); 222 mb(); 223 224 return PCIBIOS_SUCCESSFUL; 225 } 226 227 static struct pci_ops mpc52xx_pci_ops = { 228 .read = mpc52xx_pci_read_config, 229 .write = mpc52xx_pci_write_config 230 }; 231 232 233 /* ======================================================================== */ 234 /* PCI setup */ 235 /* ======================================================================== */ 236 237 static void __init 238 mpc52xx_pci_setup(struct pci_controller *hose, 239 struct mpc52xx_pci __iomem *pci_regs, phys_addr_t pci_phys) 240 { 241 struct resource *res; 242 u32 tmp; 243 int iwcr0 = 0, iwcr1 = 0, iwcr2 = 0; 244 245 pr_debug("mpc52xx_pci_setup(hose=%p, pci_regs=%p)\n", hose, pci_regs); 246 247 /* pci_process_bridge_OF_ranges() found all our addresses for us; 248 * now store them in the right places */ 249 hose->cfg_addr = &pci_regs->car; 250 hose->cfg_data = hose->io_base_virt; 251 252 /* Control regs */ 253 tmp = in_be32(&pci_regs->scr); 254 tmp |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY; 255 out_be32(&pci_regs->scr, tmp); 256 257 /* Memory windows */ 258 res = &hose->mem_resources[0]; 259 if (res->flags) { 260 pr_debug("mem_resource[0] = " 261 "{.start=%llx, .end=%llx, .flags=%llx}\n", 262 (unsigned long long)res->start, 263 (unsigned long long)res->end, 264 (unsigned long long)res->flags); 265 out_be32(&pci_regs->iw0btar, 266 MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start, 267 resource_size(res))); 268 iwcr0 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM; 269 if (res->flags & IORESOURCE_PREFETCH) 270 iwcr0 |= MPC52xx_PCI_IWCR_READ_MULTI; 271 else 272 iwcr0 |= MPC52xx_PCI_IWCR_READ; 273 } 274 275 res = &hose->mem_resources[1]; 276 if (res->flags) { 277 pr_debug("mem_resource[1] = {.start=%x, .end=%x, .flags=%lx}\n", 278 res->start, res->end, res->flags); 279 out_be32(&pci_regs->iw1btar, 280 MPC52xx_PCI_IWBTAR_TRANSLATION(res->start, res->start, 281 resource_size(res))); 282 iwcr1 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_MEM; 283 if (res->flags & IORESOURCE_PREFETCH) 284 iwcr1 |= MPC52xx_PCI_IWCR_READ_MULTI; 285 else 286 iwcr1 |= MPC52xx_PCI_IWCR_READ; 287 } 288 289 /* IO resources */ 290 res = &hose->io_resource; 291 if (!res) { 292 printk(KERN_ERR "%s: Didn't find IO resources\n", __FILE__); 293 return; 294 } 295 pr_debug(".io_resource={.start=%llx,.end=%llx,.flags=%llx} " 296 ".io_base_phys=0x%p\n", 297 (unsigned long long)res->start, 298 (unsigned long long)res->end, 299 (unsigned long long)res->flags, (void*)hose->io_base_phys); 300 out_be32(&pci_regs->iw2btar, 301 MPC52xx_PCI_IWBTAR_TRANSLATION(hose->io_base_phys, 302 res->start, 303 resource_size(res))); 304 iwcr2 = MPC52xx_PCI_IWCR_ENABLE | MPC52xx_PCI_IWCR_IO; 305 306 /* Set all the IWCR fields at once; they're in the same reg */ 307 out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2)); 308 309 /* Map IMMR onto PCI bus */ 310 pci_phys &= 0xfffc0000; /* bar0 has only 14 significant bits */ 311 out_be32(&pci_regs->tbatr0, MPC52xx_PCI_TBATR_ENABLE | pci_phys); 312 out_be32(&pci_regs->bar0, PCI_BASE_ADDRESS_MEM_PREFETCH | pci_phys); 313 314 /* Map memory onto PCI bus */ 315 out_be32(&pci_regs->tbatr1, MPC52xx_PCI_TBATR_ENABLE); 316 out_be32(&pci_regs->bar1, PCI_BASE_ADDRESS_MEM_PREFETCH); 317 318 out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD | MPC52xx_PCI_TCR_WCT8); 319 320 tmp = in_be32(&pci_regs->gscr); 321 #if 0 322 /* Reset the exteral bus ( internal PCI controller is NOT resetted ) */ 323 /* Not necessary and can be a bad thing if for example the bootloader 324 is displaying a splash screen or ... Just left here for 325 documentation purpose if anyone need it */ 326 out_be32(&pci_regs->gscr, tmp | MPC52xx_PCI_GSCR_PR); 327 udelay(50); 328 #endif 329 330 /* Make sure the PCI bridge is out of reset */ 331 out_be32(&pci_regs->gscr, tmp & ~MPC52xx_PCI_GSCR_PR); 332 } 333 334 static void 335 mpc52xx_pci_fixup_resources(struct pci_dev *dev) 336 { 337 int i; 338 339 pr_debug("mpc52xx_pci_fixup_resources() %.4x:%.4x\n", 340 dev->vendor, dev->device); 341 342 /* We don't rely on boot loader for PCI and resets all 343 devices */ 344 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 345 struct resource *res = &dev->resource[i]; 346 if (res->end > res->start) { /* Only valid resources */ 347 res->end -= res->start; 348 res->start = 0; 349 res->flags |= IORESOURCE_UNSET; 350 } 351 } 352 353 /* The PCI Host bridge of MPC52xx has a prefetch memory resource 354 fixed to 1Gb. Doesn't fit in the resource system so we remove it */ 355 if ( (dev->vendor == PCI_VENDOR_ID_MOTOROLA) && 356 ( dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200 357 || dev->device == PCI_DEVICE_ID_MOTOROLA_MPC5200B) ) { 358 struct resource *res = &dev->resource[1]; 359 res->start = res->end = res->flags = 0; 360 } 361 } 362 363 int __init 364 mpc52xx_add_bridge(struct device_node *node) 365 { 366 int len; 367 struct mpc52xx_pci __iomem *pci_regs; 368 struct pci_controller *hose; 369 const int *bus_range; 370 struct resource rsrc; 371 372 pr_debug("Adding MPC52xx PCI host bridge %s\n", node->full_name); 373 374 ppc_pci_add_flags(PPC_PCI_REASSIGN_ALL_BUS); 375 376 if (of_address_to_resource(node, 0, &rsrc) != 0) { 377 printk(KERN_ERR "Can't get %s resources\n", node->full_name); 378 return -EINVAL; 379 } 380 381 bus_range = of_get_property(node, "bus-range", &len); 382 if (bus_range == NULL || len < 2 * sizeof(int)) { 383 printk(KERN_WARNING "Can't get %s bus-range, assume bus 0\n", 384 node->full_name); 385 bus_range = NULL; 386 } 387 388 /* There are some PCI quirks on the 52xx, register the hook to 389 * fix them. */ 390 ppc_md.pcibios_fixup_resources = mpc52xx_pci_fixup_resources; 391 392 /* Alloc and initialize the pci controller. Values in the device 393 * tree are needed to configure the 52xx PCI controller. Rather 394 * than parse the tree here, let pci_process_bridge_OF_ranges() 395 * do it for us and extract the values after the fact */ 396 hose = pcibios_alloc_controller(node); 397 if (!hose) 398 return -ENOMEM; 399 400 hose->first_busno = bus_range ? bus_range[0] : 0; 401 hose->last_busno = bus_range ? bus_range[1] : 0xff; 402 403 hose->ops = &mpc52xx_pci_ops; 404 405 pci_regs = ioremap(rsrc.start, resource_size(&rsrc)); 406 if (!pci_regs) 407 return -ENOMEM; 408 409 pci_process_bridge_OF_ranges(hose, node, 1); 410 411 /* Finish setting up PCI using values obtained by 412 * pci_proces_bridge_OF_ranges */ 413 mpc52xx_pci_setup(hose, pci_regs, rsrc.start); 414 415 return 0; 416 } 417 418 void __init mpc52xx_setup_pci(void) 419 { 420 struct device_node *pci; 421 422 pci = of_find_matching_node(NULL, mpc52xx_pci_ids); 423 if (!pci) 424 return; 425 426 mpc52xx_add_bridge(pci); 427 of_node_put(pci); 428 } 429