1 /* 2 * Copyright 2007 Freescale Semiconductor, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * Version 2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 16 * MA 02111-1307 USA 17 */ 18 19 #include <common.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 /* 24 * PCI/PCIE Controller initialization for mpc85xx/mpc86xx soc's 25 * 26 * Initialize controller and call the common driver/pci pci_hose_scan to 27 * scan for bridges and devices. 28 * 29 * Hose fields which need to be pre-initialized by board specific code: 30 * regions[] 31 * first_busno 32 * 33 * Fields updated: 34 * last_busno 35 */ 36 37 #include <pci.h> 38 #include <asm/immap_fsl_pci.h> 39 40 /* Freescale-specific PCI config registers */ 41 #define FSL_PCI_PBFR 0x44 42 #define FSL_PCIE_CAP_ID 0x4c 43 #define FSL_PCIE_CFG_RDY 0x4b0 44 45 void pciauto_prescan_setup_bridge(struct pci_controller *hose, 46 pci_dev_t dev, int sub_bus); 47 void pciauto_postscan_setup_bridge(struct pci_controller *hose, 48 pci_dev_t dev, int sub_bus); 49 void pciauto_config_init(struct pci_controller *hose); 50 51 #ifndef CONFIG_SYS_PCI_MEMORY_BUS 52 #define CONFIG_SYS_PCI_MEMORY_BUS 0 53 #endif 54 55 #ifndef CONFIG_SYS_PCI_MEMORY_PHYS 56 #define CONFIG_SYS_PCI_MEMORY_PHYS 0 57 #endif 58 59 #if defined(CONFIG_SYS_PCI_64BIT) && !defined(CONFIG_SYS_PCI64_MEMORY_BUS) 60 #define CONFIG_SYS_PCI64_MEMORY_BUS (64ull*1024*1024*1024) 61 #endif 62 63 int fsl_pci_setup_inbound_windows(struct pci_region *r) 64 { 65 struct pci_region *rgn_base = r; 66 u64 sz = min((u64)gd->ram_size, (1ull << 32) - 1); 67 68 phys_addr_t phys_start = CONFIG_SYS_PCI_MEMORY_PHYS; 69 pci_addr_t bus_start = CONFIG_SYS_PCI_MEMORY_BUS; 70 pci_size_t pci_sz = 1ull << __ilog2_u64(sz); 71 72 debug ("R0 bus_start: %llx phys_start: %llx size: %llx\n", 73 (u64)bus_start, (u64)phys_start, (u64)pci_sz); 74 pci_set_region(r++, bus_start, phys_start, pci_sz, 75 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY | 76 PCI_REGION_PREFETCH); 77 78 sz -= pci_sz; 79 bus_start += pci_sz; 80 phys_start += pci_sz; 81 82 pci_sz = 1ull << __ilog2_u64(sz); 83 if (sz) { 84 debug ("R1 bus_start: %llx phys_start: %llx size: %llx\n", 85 (u64)bus_start, (u64)phys_start, (u64)pci_sz); 86 pci_set_region(r++, bus_start, phys_start, pci_sz, 87 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY | 88 PCI_REGION_PREFETCH); 89 sz -= pci_sz; 90 bus_start += pci_sz; 91 phys_start += pci_sz; 92 } 93 94 #if defined(CONFIG_PHYS_64BIT) && defined(CONFIG_SYS_PCI_64BIT) 95 /* 96 * On 64-bit capable systems, set up a mapping for all of DRAM 97 * in high pci address space. 98 */ 99 pci_sz = 1ull << __ilog2_u64(gd->ram_size); 100 /* round up to the next largest power of two */ 101 if (gd->ram_size > pci_sz) 102 pci_sz = 1ull << (__ilog2_u64(gd->ram_size) + 1); 103 debug ("R64 bus_start: %llx phys_start: %llx size: %llx\n", 104 (u64)CONFIG_SYS_PCI64_MEMORY_BUS, 105 (u64)CONFIG_SYS_PCI_MEMORY_PHYS, 106 (u64)pci_sz); 107 pci_set_region(r++, 108 CONFIG_SYS_PCI64_MEMORY_BUS, 109 CONFIG_SYS_PCI_MEMORY_PHYS, 110 pci_sz, 111 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY | 112 PCI_REGION_PREFETCH); 113 #else 114 pci_sz = 1ull << __ilog2_u64(sz); 115 if (sz) { 116 debug ("R2 bus_start: %llx phys_start: %llx size: %llx\n", 117 (u64)bus_start, (u64)phys_start, (u64)pci_sz); 118 pci_set_region(r++, bus_start, phys_start, pci_sz, 119 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY | 120 PCI_REGION_PREFETCH); 121 sz -= pci_sz; 122 bus_start += pci_sz; 123 phys_start += pci_sz; 124 } 125 #endif 126 127 #ifdef CONFIG_PHYS_64BIT 128 if (sz && (((u64)gd->ram_size) < (1ull << 32))) 129 printf("Was not able to map all of memory via " 130 "inbound windows -- %lld remaining\n", sz); 131 #endif 132 133 return r - rgn_base; 134 } 135 136 void fsl_pci_init(struct pci_controller *hose) 137 { 138 u16 temp16; 139 u32 temp32; 140 int busno = hose->first_busno; 141 int enabled; 142 u16 ltssm; 143 u8 temp8; 144 int r; 145 int bridge; 146 int inbound = 0; 147 volatile ccsr_fsl_pci_t *pci = (ccsr_fsl_pci_t *) hose->cfg_addr; 148 pci_dev_t dev = PCI_BDF(busno,0,0); 149 150 /* Initialize ATMU registers based on hose regions and flags */ 151 volatile pot_t *po = &pci->pot[1]; /* skip 0 */ 152 volatile pit_t *pi = &pci->pit[0]; /* ranges from: 3 to 1 */ 153 154 #ifdef DEBUG 155 int neg_link_w; 156 #endif 157 158 for (r=0; r<hose->region_count; r++) { 159 u32 sz = (__ilog2_u64((u64)hose->regions[r].size) - 1); 160 if (hose->regions[r].flags & PCI_REGION_SYS_MEMORY) { /* inbound */ 161 u32 flag = PIWAR_EN | PIWAR_LOCAL | 162 PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP; 163 pi->pitar = (hose->regions[r].phys_start >> 12); 164 pi->piwbar = (hose->regions[r].bus_start >> 12); 165 #ifdef CONFIG_SYS_PCI_64BIT 166 pi->piwbear = (hose->regions[r].bus_start >> 44); 167 #else 168 pi->piwbear = 0; 169 #endif 170 if (hose->regions[r].flags & PCI_REGION_PREFETCH) 171 flag |= PIWAR_PF; 172 pi->piwar = flag | sz; 173 pi++; 174 inbound = hose->regions[r].size > 0; 175 } else { /* Outbound */ 176 po->powbar = (hose->regions[r].phys_start >> 12); 177 po->potar = (hose->regions[r].bus_start >> 12); 178 #ifdef CONFIG_SYS_PCI_64BIT 179 po->potear = (hose->regions[r].bus_start >> 44); 180 #else 181 po->potear = 0; 182 #endif 183 if (hose->regions[r].flags & PCI_REGION_IO) 184 po->powar = POWAR_EN | sz | 185 POWAR_IO_READ | POWAR_IO_WRITE; 186 else 187 po->powar = POWAR_EN | sz | 188 POWAR_MEM_READ | POWAR_MEM_WRITE; 189 po++; 190 } 191 } 192 193 pci_register_hose(hose); 194 pciauto_config_init(hose); /* grab pci_{mem,prefetch,io} */ 195 hose->current_busno = hose->first_busno; 196 197 pci->pedr = 0xffffffff; /* Clear any errors */ 198 pci->peer = ~0x20140; /* Enable All Error Interupts except 199 * - Master abort (pci) 200 * - Master PERR (pci) 201 * - ICCA (PCIe) 202 */ 203 pci_hose_read_config_dword (hose, dev, PCI_DCR, &temp32); 204 temp32 |= 0xf000e; /* set URR, FER, NFER (but not CER) */ 205 pci_hose_write_config_dword(hose, dev, PCI_DCR, temp32); 206 207 pci_hose_read_config_byte (hose, dev, PCI_HEADER_TYPE, &temp8); 208 bridge = temp8 & PCI_HEADER_TYPE_BRIDGE; /* Bridge, such as pcie */ 209 210 if ( bridge ) { 211 212 pci_hose_read_config_word(hose, dev, PCI_LTSSM, <ssm); 213 enabled = ltssm >= PCI_LTSSM_L0; 214 215 #ifdef CONFIG_FSL_PCIE_RESET 216 if (ltssm == 1) { 217 int i; 218 debug("....PCIe link error. " 219 "LTSSM=0x%02x.", ltssm); 220 pci->pdb_stat |= 0x08000000; /* assert PCIe reset */ 221 temp32 = pci->pdb_stat; 222 udelay(100); 223 debug(" Asserting PCIe reset @%x = %x\n", 224 &pci->pdb_stat, pci->pdb_stat); 225 pci->pdb_stat &= ~0x08000000; /* clear reset */ 226 asm("sync;isync"); 227 for (i=0; i<100 && ltssm < PCI_LTSSM_L0; i++) { 228 pci_hose_read_config_word(hose, dev, PCI_LTSSM, 229 <ssm); 230 udelay(1000); 231 debug("....PCIe link error. " 232 "LTSSM=0x%02x.\n", ltssm); 233 } 234 enabled = ltssm >= PCI_LTSSM_L0; 235 } 236 #endif 237 238 if (!enabled) { 239 debug("....PCIE link error. Skipping scan." 240 "LTSSM=0x%02x\n", ltssm); 241 hose->last_busno = hose->first_busno; 242 return; 243 } 244 245 pci->pme_msg_det = 0xffffffff; 246 pci->pme_msg_int_en = 0xffffffff; 247 #ifdef DEBUG 248 pci_hose_read_config_word(hose, dev, PCI_LSR, &temp16); 249 neg_link_w = (temp16 & 0x3f0 ) >> 4; 250 printf("...PCIE LTSSM=0x%x, Negotiated link width=%d\n", 251 ltssm, neg_link_w); 252 #endif 253 hose->current_busno++; /* Start scan with secondary */ 254 pciauto_prescan_setup_bridge(hose, dev, hose->current_busno); 255 256 } 257 258 /* Use generic setup_device to initialize standard pci regs, 259 * but do not allocate any windows since any BAR found (such 260 * as PCSRBAR) is not in this cpu's memory space. 261 */ 262 263 pciauto_setup_device(hose, dev, 0, hose->pci_mem, 264 hose->pci_prefetch, hose->pci_io); 265 266 if (inbound) { 267 pci_hose_read_config_word(hose, dev, PCI_COMMAND, &temp16); 268 pci_hose_write_config_word(hose, dev, PCI_COMMAND, 269 temp16 | PCI_COMMAND_MEMORY); 270 } 271 272 #ifndef CONFIG_PCI_NOSCAN 273 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &temp8); 274 275 /* Programming Interface (PCI_CLASS_PROG) 276 * 0 == pci host or pcie root-complex, 277 * 1 == pci agent or pcie end-point 278 */ 279 if (!temp8) { 280 printf(" Scanning PCI bus %02x\n", 281 hose->current_busno); 282 hose->last_busno = pci_hose_scan_bus(hose, hose->current_busno); 283 } else { 284 debug(" Not scanning PCI bus %02x. PI=%x\n", 285 hose->current_busno, temp8); 286 hose->last_busno = hose->current_busno; 287 } 288 289 if ( bridge ) { /* update limit regs and subordinate busno */ 290 pciauto_postscan_setup_bridge(hose, dev, hose->last_busno); 291 } 292 #else 293 hose->last_busno = hose->current_busno; 294 #endif 295 296 /* Clear all error indications */ 297 298 if (bridge) 299 pci->pme_msg_det = 0xffffffff; 300 pci->pedr = 0xffffffff; 301 302 pci_hose_read_config_word (hose, dev, PCI_DSR, &temp16); 303 if (temp16) { 304 pci_hose_write_config_word(hose, dev, 305 PCI_DSR, 0xffff); 306 } 307 308 pci_hose_read_config_word (hose, dev, PCI_SEC_STATUS, &temp16); 309 if (temp16) { 310 pci_hose_write_config_word(hose, dev, PCI_SEC_STATUS, 0xffff); 311 } 312 } 313 314 /* Enable inbound PCI config cycles for agent/endpoint interface */ 315 void fsl_pci_config_unlock(struct pci_controller *hose) 316 { 317 pci_dev_t dev = PCI_BDF(hose->first_busno,0,0); 318 u8 agent; 319 u8 pcie_cap; 320 u16 pbfr; 321 322 pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &agent); 323 if (!agent) 324 return; 325 326 pci_hose_read_config_byte(hose, dev, FSL_PCIE_CAP_ID, &pcie_cap); 327 if (pcie_cap != 0x0) { 328 /* PCIe - set CFG_READY bit of Configuration Ready Register */ 329 pci_hose_write_config_byte(hose, dev, FSL_PCIE_CFG_RDY, 0x1); 330 } else { 331 /* PCI - clear ACL bit of PBFR */ 332 pci_hose_read_config_word(hose, dev, FSL_PCI_PBFR, &pbfr); 333 pbfr &= ~0x20; 334 pci_hose_write_config_word(hose, dev, FSL_PCI_PBFR, pbfr); 335 } 336 } 337 338 #ifdef CONFIG_OF_BOARD_SETUP 339 #include <libfdt.h> 340 #include <fdt_support.h> 341 342 void ft_fsl_pci_setup(void *blob, const char *pci_alias, 343 struct pci_controller *hose) 344 { 345 int off = fdt_path_offset(blob, pci_alias); 346 347 if (off >= 0) { 348 u32 bus_range[2]; 349 350 bus_range[0] = 0; 351 bus_range[1] = hose->last_busno - hose->first_busno; 352 fdt_setprop(blob, off, "bus-range", &bus_range[0], 2*4); 353 fdt_pci_dma_ranges(blob, off, hose); 354 } 355 } 356 #endif 357