drivers/pci/host/pcie-designware.c

   1 /*
   2  * Synopsys Designware PCIe host controller driver
   3  *
   4  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * Author: Jingoo Han <jg1.han@samsung.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/irq.h>
  15 #include <linux/irqdomain.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/msi.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_pci.h>
  21 #include <linux/pci.h>
  22 #include <linux/pci_regs.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/types.h>
  25 #include <linux/delay.h>
  26
  27 #include "pcie-designware.h"
  28
  29 /* Synopsis specific PCIE configuration registers */
  30 #define PCIE_PORT_LINK_CONTROL          0x710
  31 #define PORT_LINK_MODE_MASK             (0x3f << 16)
  32 #define PORT_LINK_MODE_1_LANES          (0x1 << 16)
  33 #define PORT_LINK_MODE_2_LANES          (0x3 << 16)
  34 #define PORT_LINK_MODE_4_LANES          (0x7 << 16)
  35 #define PORT_LINK_MODE_8_LANES          (0xf << 16)
  36
  37 #define PCIE_LINK_WIDTH_SPEED_CONTROL   0x80C
  38 #define PORT_LOGIC_SPEED_CHANGE         (0x1 << 17)
  39 #define PORT_LOGIC_LINK_WIDTH_MASK      (0x1f << 8)
  40 #define PORT_LOGIC_LINK_WIDTH_1_LANES   (0x1 << 8)
  41 #define PORT_LOGIC_LINK_WIDTH_2_LANES   (0x2 << 8)
  42 #define PORT_LOGIC_LINK_WIDTH_4_LANES   (0x4 << 8)
  43 #define PORT_LOGIC_LINK_WIDTH_8_LANES   (0x8 << 8)
  44
  45 #define PCIE_MSI_ADDR_LO                0x820
  46 #define PCIE_MSI_ADDR_HI                0x824
  47 #define PCIE_MSI_INTR0_ENABLE           0x828
  48 #define PCIE_MSI_INTR0_MASK             0x82C
  49 #define PCIE_MSI_INTR0_STATUS           0x830
  50
  51 #define PCIE_ATU_VIEWPORT               0x900
  52 #define PCIE_ATU_REGION_INBOUND         (0x1 << 31)
  53 #define PCIE_ATU_REGION_OUTBOUND        (0x0 << 31)
  54 #define PCIE_ATU_REGION_INDEX1          (0x1 << 0)
  55 #define PCIE_ATU_REGION_INDEX0          (0x0 << 0)
  56 #define PCIE_ATU_CR1                    0x904
  57 #define PCIE_ATU_TYPE_MEM               (0x0 << 0)
  58 #define PCIE_ATU_TYPE_IO                (0x2 << 0)
  59 #define PCIE_ATU_TYPE_CFG0              (0x4 << 0)
  60 #define PCIE_ATU_TYPE_CFG1              (0x5 << 0)
  61 #define PCIE_ATU_CR2                    0x908
  62 #define PCIE_ATU_ENABLE                 (0x1 << 31)
  63 #define PCIE_ATU_BAR_MODE_ENABLE        (0x1 << 30)
  64 #define PCIE_ATU_LOWER_BASE             0x90C
  65 #define PCIE_ATU_UPPER_BASE             0x910
  66 #define PCIE_ATU_LIMIT                  0x914
  67 #define PCIE_ATU_LOWER_TARGET           0x918
  68 #define PCIE_ATU_BUS(x)                 (((x) & 0xff) << 24)
  69 #define PCIE_ATU_DEV(x)                 (((x) & 0x1f) << 19)
  70 #define PCIE_ATU_FUNC(x)                (((x) & 0x7) << 16)
  71 #define PCIE_ATU_UPPER_TARGET           0x91C
  72
  73 /* PCIe Port Logic registers */
  74 #define PLR_OFFSET                      0x700
  75 #define PCIE_PHY_DEBUG_R1               (PLR_OFFSET + 0x2c)
  76 #define PCIE_PHY_DEBUG_R1_LINK_UP       0x00000010
  77
  78 static struct pci_ops dw_pcie_ops;
  79
  80 int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
  81 {
  82         if ((uintptr_t)addr & (size - 1)) {
  83                 *val = 0;
  84                 return PCIBIOS_BAD_REGISTER_NUMBER;
  85         }
  86
  87         if (size == 4)
  88                 *val = readl(addr);
  89         else if (size == 2)
  90                 *val = readw(addr);
  91         else if (size == 1)
  92                 *val = readb(addr);
  93         else {
  94                 *val = 0;
  95                 return PCIBIOS_BAD_REGISTER_NUMBER;
  96         }
  97
  98         return PCIBIOS_SUCCESSFUL;
  99 }
 100
 101 int dw_pcie_cfg_write(void __iomem *addr, int size, u32 val)
 102 {
 103         if ((uintptr_t)addr & (size - 1))
 104                 return PCIBIOS_BAD_REGISTER_NUMBER;
 105
 106         if (size == 4)
 107                 writel(val, addr);
 108         else if (size == 2)
 109                 writew(val, addr);
 110         else if (size == 1)
 111                 writeb(val, addr);
 112         else
 113                 return PCIBIOS_BAD_REGISTER_NUMBER;
 114
 115         return PCIBIOS_SUCCESSFUL;
 116 }
 117
 118 static inline void dw_pcie_readl_rc(struct pcie_port *pp, u32 reg, u32 *val)
 119 {
 120         if (pp->ops->readl_rc)
 121                 pp->ops->readl_rc(pp, pp->dbi_base + reg, val);
 122         else
 123                 *val = readl(pp->dbi_base + reg);
 124 }
 125
 126 static inline void dw_pcie_writel_rc(struct pcie_port *pp, u32 val, u32 reg)
 127 {
 128         if (pp->ops->writel_rc)
 129                 pp->ops->writel_rc(pp, val, pp->dbi_base + reg);
 130         else
 131                 writel(val, pp->dbi_base + reg);
 132 }
 133
 134 static int dw_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
 135                                u32 *val)
 136 {
 137         if (pp->ops->rd_own_conf)
 138                 return pp->ops->rd_own_conf(pp, where, size, val);
 139
 140         return dw_pcie_cfg_read(pp->dbi_base + where, size, val);
 141 }
 142
 143 static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
 144                                u32 val)
 145 {
 146         if (pp->ops->wr_own_conf)
 147                 return pp->ops->wr_own_conf(pp, where, size, val);
 148
 149         return dw_pcie_cfg_write(pp->dbi_base + where, size, val);
 150 }
 151
 152 static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
 153                 int type, u64 cpu_addr, u64 pci_addr, u32 size)
 154 {
 155         u32 val;
 156
 157         dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | index,
 158                           PCIE_ATU_VIEWPORT);
 159         dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr), PCIE_ATU_LOWER_BASE);
 160         dw_pcie_writel_rc(pp, upper_32_bits(cpu_addr), PCIE_ATU_UPPER_BASE);
 161         dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr + size - 1),
 162                           PCIE_ATU_LIMIT);
 163         dw_pcie_writel_rc(pp, lower_32_bits(pci_addr), PCIE_ATU_LOWER_TARGET);
 164         dw_pcie_writel_rc(pp, upper_32_bits(pci_addr), PCIE_ATU_UPPER_TARGET);
 165         dw_pcie_writel_rc(pp, type, PCIE_ATU_CR1);
 166         dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
 167
 168         /*
 169          * Make sure ATU enable takes effect before any subsequent config
 170          * and I/O accesses.
 171          */
 172         dw_pcie_readl_rc(pp, PCIE_ATU_CR2, &val);
 173 }
 174
 175 static struct irq_chip dw_msi_irq_chip = {
 176         .name = "PCI-MSI",
 177         .irq_enable = pci_msi_unmask_irq,
 178         .irq_disable = pci_msi_mask_irq,
 179         .irq_mask = pci_msi_mask_irq,
 180         .irq_unmask = pci_msi_unmask_irq,
 181 };
 182
 183 /* MSI int handler */
 184 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
 185 {
 186         unsigned long val;
 187         int i, pos, irq;
 188         irqreturn_t ret = IRQ_NONE;
 189
 190         for (i = 0; i < MAX_MSI_CTRLS; i++) {
 191                 dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
 192                                 (u32 *)&val);
 193                 if (val) {
 194                         ret = IRQ_HANDLED;
 195                         pos = 0;
 196                         while ((pos = find_next_bit(&val, 32, pos)) != 32) {
 197                                 irq = irq_find_mapping(pp->irq_domain,
 198                                                 i * 32 + pos);
 199                                 dw_pcie_wr_own_conf(pp,
 200                                                 PCIE_MSI_INTR0_STATUS + i * 12,
 201                                                 4, 1 << pos);
 202                                 generic_handle_irq(irq);
 203                                 pos++;
 204                         }
 205                 }
 206         }
 207
 208         return ret;
 209 }
 210
 211 void dw_pcie_msi_init(struct pcie_port *pp)
 212 {
 213         u64 msi_target;
 214
 215         pp->msi_data = __get_free_pages(GFP_KERNEL, 0);
 216         msi_target = virt_to_phys((void *)pp->msi_data);
 217
 218         /* program the msi_data */
 219         dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
 220                             (u32)(msi_target & 0xffffffff));
 221         dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
 222                             (u32)(msi_target >> 32 & 0xffffffff));
 223 }
 224
 225 static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
 226 {
 227         unsigned int res, bit, val;
 228
 229         res = (irq / 32) * 12;
 230         bit = irq % 32;
 231         dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
 232         val &= ~(1 << bit);
 233         dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
 234 }
 235
 236 static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
 237                             unsigned int nvec, unsigned int pos)
 238 {
 239         unsigned int i;
 240
 241         for (i = 0; i < nvec; i++) {
 242                 irq_set_msi_desc_off(irq_base, i, NULL);
 243                 /* Disable corresponding interrupt on MSI controller */
 244                 if (pp->ops->msi_clear_irq)
 245                         pp->ops->msi_clear_irq(pp, pos + i);
 246                 else
 247                         dw_pcie_msi_clear_irq(pp, pos + i);
 248         }
 249
 250         bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
 251 }
 252
 253 static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
 254 {
 255         unsigned int res, bit, val;
 256
 257         res = (irq / 32) * 12;
 258         bit = irq % 32;
 259         dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
 260         val |= 1 << bit;
 261         dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
 262 }
 263
 264 static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
 265 {
 266         int irq, pos0, i;
 267         struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(desc);
 268
 269         pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
 270                                        order_base_2(no_irqs));
 271         if (pos0 < 0)
 272                 goto no_valid_irq;
 273
 274         irq = irq_find_mapping(pp->irq_domain, pos0);
 275         if (!irq)
 276                 goto no_valid_irq;
 277
 278         /*
 279          * irq_create_mapping (called from dw_pcie_host_init) pre-allocates
 280          * descs so there is no need to allocate descs here. We can therefore
 281          * assume that if irq_find_mapping above returns non-zero, then the
 282          * descs are also successfully allocated.
 283          */
 284
 285         for (i = 0; i < no_irqs; i++) {
 286                 if (irq_set_msi_desc_off(irq, i, desc) != 0) {
 287                         clear_irq_range(pp, irq, i, pos0);
 288                         goto no_valid_irq;
 289                 }
 290                 /*Enable corresponding interrupt in MSI interrupt controller */
 291                 if (pp->ops->msi_set_irq)
 292                         pp->ops->msi_set_irq(pp, pos0 + i);
 293                 else
 294                         dw_pcie_msi_set_irq(pp, pos0 + i);
 295         }
 296
 297         *pos = pos0;
 298         desc->nvec_used = no_irqs;
 299         desc->msi_attrib.multiple = order_base_2(no_irqs);
 300
 301         return irq;
 302
 303 no_valid_irq:
 304         *pos = pos0;
 305         return -ENOSPC;
 306 }
 307
 308 static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
 309 {
 310         struct msi_msg msg;
 311         u64 msi_target;
 312
 313         if (pp->ops->get_msi_addr)
 314                 msi_target = pp->ops->get_msi_addr(pp);
 315         else
 316                 msi_target = virt_to_phys((void *)pp->msi_data);
 317
 318         msg.address_lo = (u32)(msi_target & 0xffffffff);
 319         msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
 320
 321         if (pp->ops->get_msi_data)
 322                 msg.data = pp->ops->get_msi_data(pp, pos);
 323         else
 324                 msg.data = pos;
 325
 326         pci_write_msi_msg(irq, &msg);
 327 }
 328
 329 static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
 330                         struct msi_desc *desc)
 331 {
 332         int irq, pos;
 333         struct pcie_port *pp = pdev->bus->sysdata;
 334
 335         if (desc->msi_attrib.is_msix)
 336                 return -EINVAL;
 337
 338         irq = assign_irq(1, desc, &pos);
 339         if (irq < 0)
 340                 return irq;
 341
 342         dw_msi_setup_msg(pp, irq, pos);
 343
 344         return 0;
 345 }
 346
 347 static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev,
 348                              int nvec, int type)
 349 {
 350 #ifdef CONFIG_PCI_MSI
 351         int irq, pos;
 352         struct msi_desc *desc;
 353         struct pcie_port *pp = pdev->bus->sysdata;
 354
 355         /* MSI-X interrupts are not supported */
 356         if (type == PCI_CAP_ID_MSIX)
 357                 return -EINVAL;
 358
 359         WARN_ON(!list_is_singular(&pdev->dev.msi_list));
 360         desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
 361
 362         irq = assign_irq(nvec, desc, &pos);
 363         if (irq < 0)
 364                 return irq;
 365
 366         dw_msi_setup_msg(pp, irq, pos);
 367
 368         return 0;
 369 #else
 370         return -EINVAL;
 371 #endif
 372 }
 373
 374 static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
 375 {
 376         struct irq_data *data = irq_get_irq_data(irq);
 377         struct msi_desc *msi = irq_data_get_msi_desc(data);
 378         struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(msi);
 379
 380         clear_irq_range(pp, irq, 1, data->hwirq);
 381 }
 382
 383 static struct msi_controller dw_pcie_msi_chip = {
 384         .setup_irq = dw_msi_setup_irq,
 385         .setup_irqs = dw_msi_setup_irqs,
 386         .teardown_irq = dw_msi_teardown_irq,
 387 };
 388
 389 int dw_pcie_wait_for_link(struct pcie_port *pp)
 390 {
 391         int retries;
 392
 393         /* check if the link is up or not */
 394         for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
 395                 if (dw_pcie_link_up(pp)) {
 396                         dev_info(pp->dev, "link up\n");
 397                         return 0;
 398                 }
 399                 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
 400         }
 401
 402         dev_err(pp->dev, "phy link never came up\n");
 403
 404         return -ETIMEDOUT;
 405 }
 406
 407 int dw_pcie_link_up(struct pcie_port *pp)
 408 {
 409         u32 val;
 410
 411         if (pp->ops->link_up)
 412                 return pp->ops->link_up(pp);
 413
 414         val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
 415         return val & PCIE_PHY_DEBUG_R1_LINK_UP;
 416 }
 417
 418 static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
 419                         irq_hw_number_t hwirq)
 420 {
 421         irq_set_chip_and_handler(irq, &dw_msi_irq_chip, handle_simple_irq);
 422         irq_set_chip_data(irq, domain->host_data);
 423
 424         return 0;
 425 }
 426
 427 static const struct irq_domain_ops msi_domain_ops = {
 428         .map = dw_pcie_msi_map,
 429 };
 430
 431 int dw_pcie_host_init(struct pcie_port *pp)
 432 {
 433         struct device_node *np = pp->dev->of_node;
 434         struct platform_device *pdev = to_platform_device(pp->dev);
 435         struct pci_bus *bus, *child;
 436         struct resource *cfg_res;
 437         int i, ret;
 438         LIST_HEAD(res);
 439         struct resource_entry *win;
 440
 441         cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
 442         if (cfg_res) {
 443                 pp->cfg0_size = resource_size(cfg_res)/2;
 444                 pp->cfg1_size = resource_size(cfg_res)/2;
 445                 pp->cfg0_base = cfg_res->start;
 446                 pp->cfg1_base = cfg_res->start + pp->cfg0_size;
 447         } else if (!pp->va_cfg0_base) {
 448                 dev_err(pp->dev, "missing *config* reg space\n");
 449         }
 450
 451         ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base);
 452         if (ret)
 453                 return ret;
 454
 455         ret = devm_request_pci_bus_resources(&pdev->dev, &res);
 456         if (ret)
 457                 goto error;
 458
 459         /* Get the I/O and memory ranges from DT */
 460         resource_list_for_each_entry(win, &res) {
 461                 switch (resource_type(win->res)) {
 462                 case IORESOURCE_IO:
 463                         pp->io = win->res;
 464                         pp->io->name = "I/O";
 465                         pp->io_size = resource_size(pp->io);
 466                         pp->io_bus_addr = pp->io->start - win->offset;
 467                         ret = pci_remap_iospace(pp->io, pp->io_base);
 468                         if (ret)
 469                                 dev_warn(pp->dev, "error %d: failed to map resource %pR\n",
 470                                          ret, pp->io);
 471                         break;
 472                 case IORESOURCE_MEM:
 473                         pp->mem = win->res;
 474                         pp->mem->name = "MEM";
 475                         pp->mem_size = resource_size(pp->mem);
 476                         pp->mem_bus_addr = pp->mem->start - win->offset;
 477                         break;
 478                 case 0:
 479                         pp->cfg = win->res;
 480                         pp->cfg0_size = resource_size(pp->cfg)/2;
 481                         pp->cfg1_size = resource_size(pp->cfg)/2;
 482                         pp->cfg0_base = pp->cfg->start;
 483                         pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
 484                         break;
 485                 case IORESOURCE_BUS:
 486                         pp->busn = win->res;
 487                         break;
 488                 }
 489         }
 490
 491         if (!pp->dbi_base) {
 492                 pp->dbi_base = devm_ioremap(pp->dev, pp->cfg->start,
 493                                         resource_size(pp->cfg));
 494                 if (!pp->dbi_base) {
 495                         dev_err(pp->dev, "error with ioremap\n");
 496                         ret = -ENOMEM;
 497                         goto error;
 498                 }
 499         }
 500
 501         pp->mem_base = pp->mem->start;
 502
 503         if (!pp->va_cfg0_base) {
 504                 pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
 505                                                 pp->cfg0_size);
 506                 if (!pp->va_cfg0_base) {
 507                         dev_err(pp->dev, "error with ioremap in function\n");
 508                         ret = -ENOMEM;
 509                         goto error;
 510                 }
 511         }
 512
 513         if (!pp->va_cfg1_base) {
 514                 pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
 515                                                 pp->cfg1_size);
 516                 if (!pp->va_cfg1_base) {
 517                         dev_err(pp->dev, "error with ioremap\n");
 518                         ret = -ENOMEM;
 519                         goto error;
 520                 }
 521         }
 522
 523         ret = of_property_read_u32(np, "num-lanes", &pp->lanes);
 524         if (ret)
 525                 pp->lanes = 0;
 526
 527         if (IS_ENABLED(CONFIG_PCI_MSI)) {
 528                 if (!pp->ops->msi_host_init) {
 529                         pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
 530                                                 MAX_MSI_IRQS, &msi_domain_ops,
 531                                                 &dw_pcie_msi_chip);
 532                         if (!pp->irq_domain) {
 533                                 dev_err(pp->dev, "irq domain init failed\n");
 534                                 ret = -ENXIO;
 535                                 goto error;
 536                         }
 537
 538                         for (i = 0; i < MAX_MSI_IRQS; i++)
 539                                 irq_create_mapping(pp->irq_domain, i);
 540                 } else {
 541                         ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
 542                         if (ret < 0)
 543                                 goto error;
 544                 }
 545         }
 546
 547         if (pp->ops->host_init)
 548                 pp->ops->host_init(pp);
 549
 550         pp->root_bus_nr = pp->busn->start;
 551         if (IS_ENABLED(CONFIG_PCI_MSI)) {
 552                 bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
 553                                             &dw_pcie_ops, pp, &res,
 554                                             &dw_pcie_msi_chip);
 555                 dw_pcie_msi_chip.dev = pp->dev;
 556         } else
 557                 bus = pci_scan_root_bus(pp->dev, pp->root_bus_nr, &dw_pcie_ops,
 558                                         pp, &res);
 559         if (!bus) {
 560                 ret = -ENOMEM;
 561                 goto error;
 562         }
 563
 564         if (pp->ops->scan_bus)
 565                 pp->ops->scan_bus(pp);
 566
 567 #ifdef CONFIG_ARM
 568         /* support old dtbs that incorrectly describe IRQs */
 569         pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
 570 #endif
 571
 572         pci_bus_size_bridges(bus);
 573         pci_bus_assign_resources(bus);
 574
 575         list_for_each_entry(child, &bus->children, node)
 576                 pcie_bus_configure_settings(child);
 577
 578         pci_bus_add_devices(bus);
 579         return 0;
 580
 581 error:
 582         pci_free_resource_list(&res);
 583         return ret;
 584 }
 585
 586 static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 587                 u32 devfn, int where, int size, u32 *val)
 588 {
 589         int ret, type;
 590         u32 busdev, cfg_size;
 591         u64 cpu_addr;
 592         void __iomem *va_cfg_base;
 593
 594         if (pp->ops->rd_other_conf)
 595                 return pp->ops->rd_other_conf(pp, bus, devfn, where, size, val);
 596
 597         busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
 598                  PCIE_ATU_FUNC(PCI_FUNC(devfn));
 599
 600         if (bus->parent->number == pp->root_bus_nr) {
 601                 type = PCIE_ATU_TYPE_CFG0;
 602                 cpu_addr = pp->cfg0_base;
 603                 cfg_size = pp->cfg0_size;
 604                 va_cfg_base = pp->va_cfg0_base;
 605         } else {
 606                 type = PCIE_ATU_TYPE_CFG1;
 607                 cpu_addr = pp->cfg1_base;
 608                 cfg_size = pp->cfg1_size;
 609                 va_cfg_base = pp->va_cfg1_base;
 610         }
 611
 612         dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
 613                                   type, cpu_addr,
 614                                   busdev, cfg_size);
 615         ret = dw_pcie_cfg_read(va_cfg_base + where, size, val);
 616         dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
 617                                   PCIE_ATU_TYPE_IO, pp->io_base,
 618                                   pp->io_bus_addr, pp->io_size);
 619
 620         return ret;
 621 }
 622
 623 static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
 624                 u32 devfn, int where, int size, u32 val)
 625 {
 626         int ret, type;
 627         u32 busdev, cfg_size;
 628         u64 cpu_addr;
 629         void __iomem *va_cfg_base;
 630
 631         if (pp->ops->wr_other_conf)
 632                 return pp->ops->wr_other_conf(pp, bus, devfn, where, size, val);
 633
 634         busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
 635                  PCIE_ATU_FUNC(PCI_FUNC(devfn));
 636
 637         if (bus->parent->number == pp->root_bus_nr) {
 638                 type = PCIE_ATU_TYPE_CFG0;
 639                 cpu_addr = pp->cfg0_base;
 640                 cfg_size = pp->cfg0_size;
 641                 va_cfg_base = pp->va_cfg0_base;
 642         } else {
 643                 type = PCIE_ATU_TYPE_CFG1;
 644                 cpu_addr = pp->cfg1_base;
 645                 cfg_size = pp->cfg1_size;
 646                 va_cfg_base = pp->va_cfg1_base;
 647         }
 648
 649         dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
 650                                   type, cpu_addr,
 651                                   busdev, cfg_size);
 652         ret = dw_pcie_cfg_write(va_cfg_base + where, size, val);
 653         dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
 654                                   PCIE_ATU_TYPE_IO, pp->io_base,
 655                                   pp->io_bus_addr, pp->io_size);
 656
 657         return ret;
 658 }
 659
 660 static int dw_pcie_valid_config(struct pcie_port *pp,
 661                                 struct pci_bus *bus, int dev)
 662 {
 663         /* If there is no link, then there is no device */
 664         if (bus->number != pp->root_bus_nr) {
 665                 if (!dw_pcie_link_up(pp))
 666                         return 0;
 667         }
 668
 669         /* access only one slot on each root port */
 670         if (bus->number == pp->root_bus_nr && dev > 0)
 671                 return 0;
 672
 673         /*
 674          * do not read more than one device on the bus directly attached
 675          * to RC's (Virtual Bridge's) DS side.
 676          */
 677         if (bus->primary == pp->root_bus_nr && dev > 0)
 678                 return 0;
 679
 680         return 1;
 681 }
 682
 683 static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 684                         int size, u32 *val)
 685 {
 686         struct pcie_port *pp = bus->sysdata;
 687
 688         if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
 689                 *val = 0xffffffff;
 690                 return PCIBIOS_DEVICE_NOT_FOUND;
 691         }
 692
 693         if (bus->number == pp->root_bus_nr)
 694                 return dw_pcie_rd_own_conf(pp, where, size, val);
 695
 696         return dw_pcie_rd_other_conf(pp, bus, devfn, where, size, val);
 697 }
 698
 699 static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
 700                         int where, int size, u32 val)
 701 {
 702         struct pcie_port *pp = bus->sysdata;
 703
 704         if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
 705                 return PCIBIOS_DEVICE_NOT_FOUND;
 706
 707         if (bus->number == pp->root_bus_nr)
 708                 return dw_pcie_wr_own_conf(pp, where, size, val);
 709
 710         return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val);
 711 }
 712
 713 static struct pci_ops dw_pcie_ops = {
 714         .read = dw_pcie_rd_conf,
 715         .write = dw_pcie_wr_conf,
 716 };
 717
 718 void dw_pcie_setup_rc(struct pcie_port *pp)
 719 {
 720         u32 val;
 721
 722         /* set the number of lanes */
 723         dw_pcie_readl_rc(pp, PCIE_PORT_LINK_CONTROL, &val);
 724         val &= ~PORT_LINK_MODE_MASK;
 725         switch (pp->lanes) {
 726         case 1:
 727                 val |= PORT_LINK_MODE_1_LANES;
 728                 break;
 729         case 2:
 730                 val |= PORT_LINK_MODE_2_LANES;
 731                 break;
 732         case 4:
 733                 val |= PORT_LINK_MODE_4_LANES;
 734                 break;
 735         case 8:
 736                 val |= PORT_LINK_MODE_8_LANES;
 737                 break;
 738         default:
 739                 dev_err(pp->dev, "num-lanes %u: invalid value\n", pp->lanes);
 740                 return;
 741         }
 742         dw_pcie_writel_rc(pp, val, PCIE_PORT_LINK_CONTROL);
 743
 744         /* set link width speed control register */
 745         dw_pcie_readl_rc(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, &val);
 746         val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
 747         switch (pp->lanes) {
 748         case 1:
 749                 val |= PORT_LOGIC_LINK_WIDTH_1_LANES;
 750                 break;
 751         case 2:
 752                 val |= PORT_LOGIC_LINK_WIDTH_2_LANES;
 753                 break;
 754         case 4:
 755                 val |= PORT_LOGIC_LINK_WIDTH_4_LANES;
 756                 break;
 757         case 8:
 758                 val |= PORT_LOGIC_LINK_WIDTH_8_LANES;
 759                 break;
 760         }
 761         dw_pcie_writel_rc(pp, val, PCIE_LINK_WIDTH_SPEED_CONTROL);
 762
 763         /* setup RC BARs */
 764         dw_pcie_writel_rc(pp, 0x00000004, PCI_BASE_ADDRESS_0);
 765         dw_pcie_writel_rc(pp, 0x00000000, PCI_BASE_ADDRESS_1);
 766
 767         /* setup interrupt pins */
 768         dw_pcie_readl_rc(pp, PCI_INTERRUPT_LINE, &val);
 769         val &= 0xffff00ff;
 770         val |= 0x00000100;
 771         dw_pcie_writel_rc(pp, val, PCI_INTERRUPT_LINE);
 772
 773         /* setup bus numbers */
 774         dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS, &val);
 775         val &= 0xff000000;
 776         val |= 0x00010100;
 777         dw_pcie_writel_rc(pp, val, PCI_PRIMARY_BUS);
 778
 779         /* setup command register */
 780         dw_pcie_readl_rc(pp, PCI_COMMAND, &val);
 781         val &= 0xffff0000;
 782         val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
 783                 PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
 784         dw_pcie_writel_rc(pp, val, PCI_COMMAND);
 785
 786         /*
 787          * If the platform provides ->rd_other_conf, it means the platform
 788          * uses its own address translation component rather than ATU, so
 789          * we should not program the ATU here.
 790          */
 791         if (!pp->ops->rd_other_conf)
 792                 dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
 793                                           PCIE_ATU_TYPE_MEM, pp->mem_base,
 794                                           pp->mem_bus_addr, pp->mem_size);
 795
 796         dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
 797
 798         /* program correct class for RC */
 799         dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
 800
 801         dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
 802         val |= PORT_LOGIC_SPEED_CHANGE;
 803         dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
 804 }
 805
 806 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 807 MODULE_DESCRIPTION("Designware PCIe host controller driver");
 808 MODULE_LICENSE("GPL v2");