1 /* 2 * PCIe driver for Marvell MVEBU SoCs 3 * 4 * Based on Barebox drivers/pci/pci-mvebu.c 5 * 6 * Ported to U-Boot by: 7 * Anton Schubert <anton.schubert@gmx.de> 8 * Stefan Roese <sr@denx.de> 9 * 10 * SPDX-License-Identifier: GPL-2.0 11 */ 12 13 #include <common.h> 14 #include <pci.h> 15 #include <linux/errno.h> 16 #include <asm/io.h> 17 #include <asm/arch/cpu.h> 18 #include <asm/arch/soc.h> 19 #include <linux/mbus.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 /* PCIe unit register offsets */ 24 #define SELECT(x, n) ((x >> n) & 1UL) 25 26 #define PCIE_DEV_ID_OFF 0x0000 27 #define PCIE_CMD_OFF 0x0004 28 #define PCIE_DEV_REV_OFF 0x0008 29 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3)) 30 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3)) 31 #define PCIE_CAPAB_OFF 0x0060 32 #define PCIE_CTRL_STAT_OFF 0x0068 33 #define PCIE_HEADER_LOG_4_OFF 0x0128 34 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4)) 35 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4)) 36 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4)) 37 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4)) 38 #define PCIE_WIN5_CTRL_OFF 0x1880 39 #define PCIE_WIN5_BASE_OFF 0x1884 40 #define PCIE_WIN5_REMAP_OFF 0x188c 41 #define PCIE_CONF_ADDR_OFF 0x18f8 42 #define PCIE_CONF_ADDR_EN BIT(31) 43 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc)) 44 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16) 45 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11) 46 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8) 47 #define PCIE_CONF_ADDR(dev, reg) \ 48 (PCIE_CONF_BUS(PCI_BUS(dev)) | PCIE_CONF_DEV(PCI_DEV(dev)) | \ 49 PCIE_CONF_FUNC(PCI_FUNC(dev)) | PCIE_CONF_REG(reg) | \ 50 PCIE_CONF_ADDR_EN) 51 #define PCIE_CONF_DATA_OFF 0x18fc 52 #define PCIE_MASK_OFF 0x1910 53 #define PCIE_MASK_ENABLE_INTS (0xf << 24) 54 #define PCIE_CTRL_OFF 0x1a00 55 #define PCIE_CTRL_X1_MODE BIT(0) 56 #define PCIE_STAT_OFF 0x1a04 57 #define PCIE_STAT_BUS (0xff << 8) 58 #define PCIE_STAT_DEV (0x1f << 16) 59 #define PCIE_STAT_LINK_DOWN BIT(0) 60 #define PCIE_DEBUG_CTRL 0x1a60 61 #define PCIE_DEBUG_SOFT_RESET BIT(20) 62 63 struct resource { 64 u32 start; 65 u32 end; 66 }; 67 68 struct mvebu_pcie { 69 struct pci_controller hose; 70 char *name; 71 void __iomem *base; 72 void __iomem *membase; 73 struct resource mem; 74 void __iomem *iobase; 75 u32 port; 76 u32 lane; 77 u32 lane_mask; 78 pci_dev_t dev; 79 }; 80 81 #define to_pcie(_hc) container_of(_hc, struct mvebu_pcie, pci) 82 83 /* 84 * MVEBU PCIe controller needs MEMORY and I/O BARs to be mapped 85 * into SoCs address space. Each controller will map 32M of MEM 86 * and 64K of I/O space when registered. 87 */ 88 static void __iomem *mvebu_pcie_membase = (void __iomem *)MBUS_PCI_MEM_BASE; 89 #define PCIE_MEM_SIZE (32 << 20) 90 91 #if defined(CONFIG_ARMADA_38X) 92 #define PCIE_BASE(if) \ 93 ((if) == 0 ? \ 94 MVEBU_REG_PCIE0_BASE : \ 95 (MVEBU_REG_PCIE_BASE + 0x4000 * (if - 1))) 96 97 /* 98 * On A38x MV6820 these PEX ports are supported: 99 * 0 - Port 0.0 100 * 1 - Port 1.0 101 * 2 - Port 2.0 102 * 3 - Port 3.0 103 */ 104 #define MAX_PEX 4 105 static struct mvebu_pcie pcie_bus[MAX_PEX]; 106 107 static void mvebu_get_port_lane(struct mvebu_pcie *pcie, int pex_idx, 108 int *mem_target, int *mem_attr) 109 { 110 u8 port[] = { 0, 1, 2, 3 }; 111 u8 lane[] = { 0, 0, 0, 0 }; 112 u8 target[] = { 8, 4, 4, 4 }; 113 u8 attr[] = { 0xe8, 0xe8, 0xd8, 0xb8 }; 114 115 pcie->port = port[pex_idx]; 116 pcie->lane = lane[pex_idx]; 117 *mem_target = target[pex_idx]; 118 *mem_attr = attr[pex_idx]; 119 } 120 #else 121 #define PCIE_BASE(if) \ 122 ((if) < 8 ? \ 123 (MVEBU_REG_PCIE_BASE + ((if) / 4) * 0x40000 + ((if) % 4) * 0x4000) : \ 124 (MVEBU_REG_PCIE_BASE + 0x2000 + ((if) % 8) * 0x40000)) 125 126 /* 127 * On AXP MV78460 these PEX ports are supported: 128 * 0 - Port 0.0 129 * 1 - Port 0.1 130 * 2 - Port 0.2 131 * 3 - Port 0.3 132 * 4 - Port 1.0 133 * 5 - Port 1.1 134 * 6 - Port 1.2 135 * 7 - Port 1.3 136 * 8 - Port 2.0 137 * 9 - Port 3.0 138 */ 139 #define MAX_PEX 10 140 static struct mvebu_pcie pcie_bus[MAX_PEX]; 141 142 static void mvebu_get_port_lane(struct mvebu_pcie *pcie, int pex_idx, 143 int *mem_target, int *mem_attr) 144 { 145 u8 port[] = { 0, 0, 0, 0, 1, 1, 1, 1, 2, 3 }; 146 u8 lane[] = { 0, 1, 2, 3, 0, 1, 2, 3, 0, 0 }; 147 u8 target[] = { 4, 4, 4, 4, 8, 8, 8, 8, 4, 8 }; 148 u8 attr[] = { 0xe8, 0xd8, 0xb8, 0x78, 149 0xe8, 0xd8, 0xb8, 0x78, 150 0xf8, 0xf8 }; 151 152 pcie->port = port[pex_idx]; 153 pcie->lane = lane[pex_idx]; 154 *mem_target = target[pex_idx]; 155 *mem_attr = attr[pex_idx]; 156 } 157 #endif 158 159 static int mvebu_pex_unit_is_x4(int pex_idx) 160 { 161 int pex_unit = pex_idx < 9 ? pex_idx >> 2 : 3; 162 u32 mask = (0x0f << (pex_unit * 8)); 163 164 return (readl(COMPHY_REFCLK_ALIGNMENT) & mask) == mask; 165 } 166 167 static inline bool mvebu_pcie_link_up(struct mvebu_pcie *pcie) 168 { 169 u32 val; 170 val = readl(pcie->base + PCIE_STAT_OFF); 171 return !(val & PCIE_STAT_LINK_DOWN); 172 } 173 174 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie *pcie, int busno) 175 { 176 u32 stat; 177 178 stat = readl(pcie->base + PCIE_STAT_OFF); 179 stat &= ~PCIE_STAT_BUS; 180 stat |= busno << 8; 181 writel(stat, pcie->base + PCIE_STAT_OFF); 182 } 183 184 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie *pcie, int devno) 185 { 186 u32 stat; 187 188 stat = readl(pcie->base + PCIE_STAT_OFF); 189 stat &= ~PCIE_STAT_DEV; 190 stat |= devno << 16; 191 writel(stat, pcie->base + PCIE_STAT_OFF); 192 } 193 194 static int mvebu_pcie_get_local_bus_nr(struct mvebu_pcie *pcie) 195 { 196 u32 stat; 197 198 stat = readl(pcie->base + PCIE_STAT_OFF); 199 return (stat & PCIE_STAT_BUS) >> 8; 200 } 201 202 static int mvebu_pcie_get_local_dev_nr(struct mvebu_pcie *pcie) 203 { 204 u32 stat; 205 206 stat = readl(pcie->base + PCIE_STAT_OFF); 207 return (stat & PCIE_STAT_DEV) >> 16; 208 } 209 210 static inline struct mvebu_pcie *hose_to_pcie(struct pci_controller *hose) 211 { 212 return container_of(hose, struct mvebu_pcie, hose); 213 } 214 215 static int mvebu_pcie_read_config_dword(struct pci_controller *hose, 216 pci_dev_t dev, int offset, u32 *val) 217 { 218 struct mvebu_pcie *pcie = hose_to_pcie(hose); 219 int local_bus = PCI_BUS(pcie->dev); 220 int local_dev = PCI_DEV(pcie->dev); 221 u32 reg; 222 223 /* Only allow one other device besides the local one on the local bus */ 224 if (PCI_BUS(dev) == local_bus && PCI_DEV(dev) != local_dev) { 225 if (local_dev == 0 && PCI_DEV(dev) != 1) { 226 /* 227 * If local dev is 0, the first other dev can 228 * only be 1 229 */ 230 *val = 0xffffffff; 231 return 1; 232 } else if (local_dev != 0 && PCI_DEV(dev) != 0) { 233 /* 234 * If local dev is not 0, the first other dev can 235 * only be 0 236 */ 237 *val = 0xffffffff; 238 return 1; 239 } 240 } 241 242 /* write address */ 243 reg = PCIE_CONF_ADDR(dev, offset); 244 writel(reg, pcie->base + PCIE_CONF_ADDR_OFF); 245 *val = readl(pcie->base + PCIE_CONF_DATA_OFF); 246 247 return 0; 248 } 249 250 static int mvebu_pcie_write_config_dword(struct pci_controller *hose, 251 pci_dev_t dev, int offset, u32 val) 252 { 253 struct mvebu_pcie *pcie = hose_to_pcie(hose); 254 int local_bus = PCI_BUS(pcie->dev); 255 int local_dev = PCI_DEV(pcie->dev); 256 257 /* Only allow one other device besides the local one on the local bus */ 258 if (PCI_BUS(dev) == local_bus && PCI_DEV(dev) != local_dev) { 259 if (local_dev == 0 && PCI_DEV(dev) != 1) { 260 /* 261 * If local dev is 0, the first other dev can 262 * only be 1 263 */ 264 return 1; 265 } else if (local_dev != 0 && PCI_DEV(dev) != 0) { 266 /* 267 * If local dev is not 0, the first other dev can 268 * only be 0 269 */ 270 return 1; 271 } 272 } 273 274 writel(PCIE_CONF_ADDR(dev, offset), pcie->base + PCIE_CONF_ADDR_OFF); 275 writel(val, pcie->base + PCIE_CONF_DATA_OFF); 276 277 return 0; 278 } 279 280 /* 281 * Setup PCIE BARs and Address Decode Wins: 282 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks 283 * WIN[0-3] -> DRAM bank[0-3] 284 */ 285 static void mvebu_pcie_setup_wins(struct mvebu_pcie *pcie) 286 { 287 const struct mbus_dram_target_info *dram = mvebu_mbus_dram_info(); 288 u32 size; 289 int i; 290 291 /* First, disable and clear BARs and windows. */ 292 for (i = 1; i < 3; i++) { 293 writel(0, pcie->base + PCIE_BAR_CTRL_OFF(i)); 294 writel(0, pcie->base + PCIE_BAR_LO_OFF(i)); 295 writel(0, pcie->base + PCIE_BAR_HI_OFF(i)); 296 } 297 298 for (i = 0; i < 5; i++) { 299 writel(0, pcie->base + PCIE_WIN04_CTRL_OFF(i)); 300 writel(0, pcie->base + PCIE_WIN04_BASE_OFF(i)); 301 writel(0, pcie->base + PCIE_WIN04_REMAP_OFF(i)); 302 } 303 304 writel(0, pcie->base + PCIE_WIN5_CTRL_OFF); 305 writel(0, pcie->base + PCIE_WIN5_BASE_OFF); 306 writel(0, pcie->base + PCIE_WIN5_REMAP_OFF); 307 308 /* Setup windows for DDR banks. Count total DDR size on the fly. */ 309 size = 0; 310 for (i = 0; i < dram->num_cs; i++) { 311 const struct mbus_dram_window *cs = dram->cs + i; 312 313 writel(cs->base & 0xffff0000, 314 pcie->base + PCIE_WIN04_BASE_OFF(i)); 315 writel(0, pcie->base + PCIE_WIN04_REMAP_OFF(i)); 316 writel(((cs->size - 1) & 0xffff0000) | 317 (cs->mbus_attr << 8) | 318 (dram->mbus_dram_target_id << 4) | 1, 319 pcie->base + PCIE_WIN04_CTRL_OFF(i)); 320 321 size += cs->size; 322 } 323 324 /* Round up 'size' to the nearest power of two. */ 325 if ((size & (size - 1)) != 0) 326 size = 1 << fls(size); 327 328 /* Setup BAR[1] to all DRAM banks. */ 329 writel(dram->cs[0].base | 0xc, pcie->base + PCIE_BAR_LO_OFF(1)); 330 writel(0, pcie->base + PCIE_BAR_HI_OFF(1)); 331 writel(((size - 1) & 0xffff0000) | 0x1, 332 pcie->base + PCIE_BAR_CTRL_OFF(1)); 333 } 334 335 void pci_init_board(void) 336 { 337 int mem_target, mem_attr, i; 338 int bus = 0; 339 u32 reg; 340 u32 soc_ctrl = readl(MVEBU_SYSTEM_REG_BASE + 0x4); 341 342 /* Check SoC Control Power State */ 343 debug("%s: SoC Control %08x, 0en %01lx, 1en %01lx, 2en %01lx\n", 344 __func__, soc_ctrl, SELECT(soc_ctrl, 0), SELECT(soc_ctrl, 1), 345 SELECT(soc_ctrl, 2)); 346 347 for (i = 0; i < MAX_PEX; i++) { 348 struct mvebu_pcie *pcie = &pcie_bus[i]; 349 struct pci_controller *hose = &pcie->hose; 350 351 /* Get port number, lane number and memory target / attr */ 352 mvebu_get_port_lane(pcie, i, &mem_target, &mem_attr); 353 354 /* Don't read at all from pci registers if port power is down */ 355 if (SELECT(soc_ctrl, pcie->port) == 0) { 356 if (pcie->lane == 0) 357 debug("%s: skipping port %d\n", __func__, pcie->port); 358 continue; 359 } 360 361 pcie->base = (void __iomem *)PCIE_BASE(i); 362 363 /* Check link and skip ports that have no link */ 364 if (!mvebu_pcie_link_up(pcie)) { 365 debug("%s: PCIe %d.%d - down\n", __func__, 366 pcie->port, pcie->lane); 367 continue; 368 } 369 debug("%s: PCIe %d.%d - up, base %08x\n", __func__, 370 pcie->port, pcie->lane, (u32)pcie->base); 371 372 /* Read Id info and local bus/dev */ 373 debug("direct conf read %08x, local bus %d, local dev %d\n", 374 readl(pcie->base), mvebu_pcie_get_local_bus_nr(pcie), 375 mvebu_pcie_get_local_dev_nr(pcie)); 376 377 mvebu_pcie_set_local_bus_nr(pcie, bus); 378 mvebu_pcie_set_local_dev_nr(pcie, 0); 379 pcie->dev = PCI_BDF(bus, 0, 0); 380 381 pcie->mem.start = (u32)mvebu_pcie_membase; 382 pcie->mem.end = pcie->mem.start + PCIE_MEM_SIZE - 1; 383 mvebu_pcie_membase += PCIE_MEM_SIZE; 384 385 if (mvebu_mbus_add_window_by_id(mem_target, mem_attr, 386 (phys_addr_t)pcie->mem.start, 387 PCIE_MEM_SIZE)) { 388 printf("PCIe unable to add mbus window for mem at %08x+%08x\n", 389 (u32)pcie->mem.start, PCIE_MEM_SIZE); 390 } 391 392 /* Setup windows and configure host bridge */ 393 mvebu_pcie_setup_wins(pcie); 394 395 /* Master + slave enable. */ 396 reg = readl(pcie->base + PCIE_CMD_OFF); 397 reg |= PCI_COMMAND_MEMORY; 398 reg |= PCI_COMMAND_MASTER; 399 reg |= BIT(10); /* disable interrupts */ 400 writel(reg, pcie->base + PCIE_CMD_OFF); 401 402 /* Setup U-Boot PCI Controller */ 403 hose->first_busno = 0; 404 hose->current_busno = bus; 405 406 /* PCI memory space */ 407 pci_set_region(hose->regions + 0, pcie->mem.start, 408 pcie->mem.start, PCIE_MEM_SIZE, PCI_REGION_MEM); 409 pci_set_region(hose->regions + 1, 410 0, 0, 411 gd->ram_size, 412 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY); 413 hose->region_count = 2; 414 415 pci_set_ops(hose, 416 pci_hose_read_config_byte_via_dword, 417 pci_hose_read_config_word_via_dword, 418 mvebu_pcie_read_config_dword, 419 pci_hose_write_config_byte_via_dword, 420 pci_hose_write_config_word_via_dword, 421 mvebu_pcie_write_config_dword); 422 pci_register_hose(hose); 423 424 hose->last_busno = pci_hose_scan(hose); 425 426 /* Set BAR0 to internal registers */ 427 writel(SOC_REGS_PHY_BASE, pcie->base + PCIE_BAR_LO_OFF(0)); 428 writel(0, pcie->base + PCIE_BAR_HI_OFF(0)); 429 430 bus = hose->last_busno + 1; 431 432 /* need to skip more for X4 links, otherwise scan will hang */ 433 if (mvebu_soc_family() == MVEBU_SOC_AXP) { 434 if (mvebu_pex_unit_is_x4(i)) 435 i += 3; 436 } 437 } 438 } 439