Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 1 | /* |
| 2 | * PCIe host controller driver for Texas Instruments Keystone SoCs |
| 3 | * |
| 4 | * Copyright (C) 2013-2014 Texas Instruments., Ltd. |
| 5 | * http://www.ti.com |
| 6 | * |
| 7 | * Author: Murali Karicheri <m-karicheri2@ti.com> |
| 8 | * Implementation based on pci-exynos.c and pcie-designware.c |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/irqchip/chained_irq.h> |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/delay.h> |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 18 | #include <linux/interrupt.h> |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 19 | #include <linux/irqdomain.h> |
Paul Gortmaker | 1481bf2 | 2016-07-02 19:13:26 -0400 | [diff] [blame] | 20 | #include <linux/init.h> |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 21 | #include <linux/msi.h> |
| 22 | #include <linux/of_irq.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/of_pci.h> |
| 25 | #include <linux/platform_device.h> |
| 26 | #include <linux/phy/phy.h> |
| 27 | #include <linux/resource.h> |
| 28 | #include <linux/signal.h> |
| 29 | |
| 30 | #include "pcie-designware.h" |
| 31 | #include "pci-keystone.h" |
| 32 | |
| 33 | #define DRIVER_NAME "keystone-pcie" |
| 34 | |
| 35 | /* driver specific constants */ |
| 36 | #define MAX_MSI_HOST_IRQS 8 |
| 37 | #define MAX_LEGACY_HOST_IRQS 4 |
| 38 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 39 | /* DEV_STAT_CTRL */ |
| 40 | #define PCIE_CAP_BASE 0x70 |
| 41 | |
Murali Karicheri | c15982d | 2014-09-08 13:03:34 -0400 | [diff] [blame] | 42 | /* PCIE controller device IDs */ |
| 43 | #define PCIE_RC_K2HK 0xb008 |
| 44 | #define PCIE_RC_K2E 0xb009 |
| 45 | #define PCIE_RC_K2L 0xb00a |
| 46 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 47 | #define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp) |
| 48 | |
Murali Karicheri | c15982d | 2014-09-08 13:03:34 -0400 | [diff] [blame] | 49 | static void quirk_limit_mrrs(struct pci_dev *dev) |
| 50 | { |
| 51 | struct pci_bus *bus = dev->bus; |
| 52 | struct pci_dev *bridge = bus->self; |
| 53 | static const struct pci_device_id rc_pci_devids[] = { |
| 54 | { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK), |
| 55 | .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, }, |
| 56 | { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E), |
| 57 | .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, }, |
| 58 | { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L), |
| 59 | .class = PCI_CLASS_BRIDGE_PCI << 8, .class_mask = ~0, }, |
| 60 | { 0, }, |
| 61 | }; |
| 62 | |
| 63 | if (pci_is_root_bus(bus)) |
| 64 | return; |
| 65 | |
| 66 | /* look for the host bridge */ |
| 67 | while (!pci_is_root_bus(bus)) { |
| 68 | bridge = bus->self; |
| 69 | bus = bus->parent; |
| 70 | } |
| 71 | |
| 72 | if (bridge) { |
| 73 | /* |
| 74 | * Keystone PCI controller has a h/w limitation of |
| 75 | * 256 bytes maximum read request size. It can't handle |
| 76 | * anything higher than this. So force this limit on |
| 77 | * all downstream devices. |
| 78 | */ |
| 79 | if (pci_match_id(rc_pci_devids, bridge)) { |
| 80 | if (pcie_get_readrq(dev) > 256) { |
| 81 | dev_info(&dev->dev, "limiting MRRS to 256\n"); |
| 82 | pcie_set_readrq(dev, 256); |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, quirk_limit_mrrs); |
| 88 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 89 | static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie) |
| 90 | { |
| 91 | struct pcie_port *pp = &ks_pcie->pp; |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 92 | struct device *dev = pp->dev; |
Bjorn Helgaas | 6cbb247 | 2015-06-02 16:47:17 -0500 | [diff] [blame] | 93 | unsigned int retries; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 94 | |
| 95 | dw_pcie_setup_rc(pp); |
| 96 | |
| 97 | if (dw_pcie_link_up(pp)) { |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 98 | dev_err(dev, "Link already up\n"); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 99 | return 0; |
| 100 | } |
| 101 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 102 | /* check if the link is up or not */ |
Joao Pinto | 886bc5c | 2016-03-10 14:44:35 -0600 | [diff] [blame] | 103 | for (retries = 0; retries < 5; retries++) { |
Bjorn Helgaas | 6cbb247 | 2015-06-02 16:47:17 -0500 | [diff] [blame] | 104 | ks_dw_pcie_initiate_link_train(ks_pcie); |
Joao Pinto | 886bc5c | 2016-03-10 14:44:35 -0600 | [diff] [blame] | 105 | if (!dw_pcie_wait_for_link(pp)) |
| 106 | return 0; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 107 | } |
| 108 | |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 109 | dev_err(dev, "phy link never came up\n"); |
Joao Pinto | 886bc5c | 2016-03-10 14:44:35 -0600 | [diff] [blame] | 110 | return -ETIMEDOUT; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 111 | } |
| 112 | |
Thomas Gleixner | bd0b9ac | 2015-09-14 10:42:37 +0200 | [diff] [blame] | 113 | static void ks_pcie_msi_irq_handler(struct irq_desc *desc) |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 114 | { |
Thomas Gleixner | 97a8596 | 2015-07-16 23:24:10 +0200 | [diff] [blame] | 115 | unsigned int irq = irq_desc_get_irq(desc); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 116 | struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); |
| 117 | u32 offset = irq - ks_pcie->msi_host_irqs[0]; |
| 118 | struct pcie_port *pp = &ks_pcie->pp; |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 119 | struct device *dev = pp->dev; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 120 | struct irq_chip *chip = irq_desc_get_chip(desc); |
| 121 | |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 122 | dev_dbg(dev, "%s, irq %d\n", __func__, irq); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 123 | |
| 124 | /* |
| 125 | * The chained irq handler installation would have replaced normal |
| 126 | * interrupt driver handler so we need to take care of mask/unmask and |
| 127 | * ack operation. |
| 128 | */ |
| 129 | chained_irq_enter(chip, desc); |
| 130 | ks_dw_pcie_handle_msi_irq(ks_pcie, offset); |
| 131 | chained_irq_exit(chip, desc); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * ks_pcie_legacy_irq_handler() - Handle legacy interrupt |
| 136 | * @irq: IRQ line for legacy interrupts |
| 137 | * @desc: Pointer to irq descriptor |
| 138 | * |
| 139 | * Traverse through pending legacy interrupts and invoke handler for each. Also |
| 140 | * takes care of interrupt controller level mask/ack operation. |
| 141 | */ |
Thomas Gleixner | bd0b9ac | 2015-09-14 10:42:37 +0200 | [diff] [blame] | 142 | static void ks_pcie_legacy_irq_handler(struct irq_desc *desc) |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 143 | { |
Thomas Gleixner | 97a8596 | 2015-07-16 23:24:10 +0200 | [diff] [blame] | 144 | unsigned int irq = irq_desc_get_irq(desc); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 145 | struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); |
| 146 | struct pcie_port *pp = &ks_pcie->pp; |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 147 | struct device *dev = pp->dev; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 148 | u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0]; |
| 149 | struct irq_chip *chip = irq_desc_get_chip(desc); |
| 150 | |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 151 | dev_dbg(dev, ": Handling legacy irq %d\n", irq); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 152 | |
| 153 | /* |
| 154 | * The chained irq handler installation would have replaced normal |
| 155 | * interrupt driver handler so we need to take care of mask/unmask and |
| 156 | * ack operation. |
| 157 | */ |
| 158 | chained_irq_enter(chip, desc); |
| 159 | ks_dw_pcie_handle_legacy_irq(ks_pcie, irq_offset); |
| 160 | chained_irq_exit(chip, desc); |
| 161 | } |
| 162 | |
| 163 | static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, |
| 164 | char *controller, int *num_irqs) |
| 165 | { |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 166 | int temp, max_host_irqs, legacy = 1, *host_irqs; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 167 | struct device *dev = ks_pcie->pp.dev; |
| 168 | struct device_node *np_pcie = dev->of_node, **np_temp; |
| 169 | |
| 170 | if (!strcmp(controller, "msi-interrupt-controller")) |
| 171 | legacy = 0; |
| 172 | |
| 173 | if (legacy) { |
| 174 | np_temp = &ks_pcie->legacy_intc_np; |
| 175 | max_host_irqs = MAX_LEGACY_HOST_IRQS; |
| 176 | host_irqs = &ks_pcie->legacy_host_irqs[0]; |
| 177 | } else { |
| 178 | np_temp = &ks_pcie->msi_intc_np; |
| 179 | max_host_irqs = MAX_MSI_HOST_IRQS; |
| 180 | host_irqs = &ks_pcie->msi_host_irqs[0]; |
| 181 | } |
| 182 | |
| 183 | /* interrupt controller is in a child node */ |
| 184 | *np_temp = of_find_node_by_name(np_pcie, controller); |
| 185 | if (!(*np_temp)) { |
| 186 | dev_err(dev, "Node for %s is absent\n", controller); |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 187 | return -EINVAL; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 188 | } |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 189 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 190 | temp = of_irq_count(*np_temp); |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 191 | if (!temp) { |
| 192 | dev_err(dev, "No IRQ entries in %s\n", controller); |
| 193 | return -EINVAL; |
| 194 | } |
| 195 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 196 | if (temp > max_host_irqs) |
| 197 | dev_warn(dev, "Too many %s interrupts defined %u\n", |
| 198 | (legacy ? "legacy" : "MSI"), temp); |
| 199 | |
| 200 | /* |
| 201 | * support upto max_host_irqs. In dt from index 0 to 3 (legacy) or 0 to |
| 202 | * 7 (MSI) |
| 203 | */ |
| 204 | for (temp = 0; temp < max_host_irqs; temp++) { |
| 205 | host_irqs[temp] = irq_of_parse_and_map(*np_temp, temp); |
Dmitry Torokhov | ea3651f | 2014-11-14 14:19:03 -0800 | [diff] [blame] | 206 | if (!host_irqs[temp]) |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 207 | break; |
| 208 | } |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 209 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 210 | if (temp) { |
| 211 | *num_irqs = temp; |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 212 | return 0; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 213 | } |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 214 | |
| 215 | return -EINVAL; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie) |
| 219 | { |
| 220 | int i; |
| 221 | |
| 222 | /* Legacy IRQ */ |
| 223 | for (i = 0; i < ks_pcie->num_legacy_host_irqs; i++) { |
Thomas Gleixner | 5168a73 | 2015-06-21 21:11:05 +0200 | [diff] [blame] | 224 | irq_set_chained_handler_and_data(ks_pcie->legacy_host_irqs[i], |
| 225 | ks_pcie_legacy_irq_handler, |
| 226 | ks_pcie); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 227 | } |
| 228 | ks_dw_pcie_enable_legacy_irqs(ks_pcie); |
| 229 | |
| 230 | /* MSI IRQ */ |
| 231 | if (IS_ENABLED(CONFIG_PCI_MSI)) { |
| 232 | for (i = 0; i < ks_pcie->num_msi_host_irqs; i++) { |
Thomas Gleixner | 2cf5a03 | 2015-06-21 20:16:09 +0200 | [diff] [blame] | 233 | irq_set_chained_handler_and_data(ks_pcie->msi_host_irqs[i], |
| 234 | ks_pcie_msi_irq_handler, |
| 235 | ks_pcie); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 236 | } |
| 237 | } |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 238 | |
| 239 | if (ks_pcie->error_irq > 0) |
| 240 | ks_dw_pcie_enable_error_irq(ks_pcie->va_app_base); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | /* |
| 244 | * When a PCI device does not exist during config cycles, keystone host gets a |
| 245 | * bus error instead of returning 0xffffffff. This handler always returns 0 |
| 246 | * for this kind of faults. |
| 247 | */ |
| 248 | static int keystone_pcie_fault(unsigned long addr, unsigned int fsr, |
| 249 | struct pt_regs *regs) |
| 250 | { |
| 251 | unsigned long instr = *(unsigned long *) instruction_pointer(regs); |
| 252 | |
| 253 | if ((instr & 0x0e100090) == 0x00100090) { |
| 254 | int reg = (instr >> 12) & 15; |
| 255 | |
| 256 | regs->uregs[reg] = -1; |
| 257 | regs->ARM_pc += 4; |
| 258 | } |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static void __init ks_pcie_host_init(struct pcie_port *pp) |
| 264 | { |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 265 | struct keystone_pcie *ks_pcie = to_keystone_pcie(pp); |
Murali Karicheri | 8665a48 | 2014-09-10 13:12:39 -0400 | [diff] [blame] | 266 | u32 val; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 267 | |
| 268 | ks_pcie_establish_link(ks_pcie); |
| 269 | ks_dw_pcie_setup_rc_app_regs(ks_pcie); |
| 270 | ks_pcie_setup_interrupts(ks_pcie); |
| 271 | writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8), |
| 272 | pp->dbi_base + PCI_IO_BASE); |
| 273 | |
| 274 | /* update the Vendor ID */ |
Murali Karicheri | 8665a48 | 2014-09-10 13:12:39 -0400 | [diff] [blame] | 275 | writew(ks_pcie->device_id, pp->dbi_base + PCI_DEVICE_ID); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 276 | |
| 277 | /* update the DEV_STAT_CTRL to publish right mrrs */ |
| 278 | val = readl(pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL); |
| 279 | val &= ~PCI_EXP_DEVCTL_READRQ; |
| 280 | /* set the mrrs to 256 bytes */ |
| 281 | val |= BIT(12); |
| 282 | writel(val, pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL); |
| 283 | |
| 284 | /* |
| 285 | * PCIe access errors that result into OCP errors are caught by ARM as |
| 286 | * "External aborts" |
| 287 | */ |
| 288 | hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0, |
| 289 | "Asynchronous external abort"); |
| 290 | } |
| 291 | |
| 292 | static struct pcie_host_ops keystone_pcie_host_ops = { |
| 293 | .rd_other_conf = ks_dw_pcie_rd_other_conf, |
| 294 | .wr_other_conf = ks_dw_pcie_wr_other_conf, |
| 295 | .link_up = ks_dw_pcie_link_up, |
| 296 | .host_init = ks_pcie_host_init, |
| 297 | .msi_set_irq = ks_dw_pcie_msi_set_irq, |
| 298 | .msi_clear_irq = ks_dw_pcie_msi_clear_irq, |
Bjorn Helgaas | 1104528 | 2014-09-29 13:24:24 -0600 | [diff] [blame] | 299 | .get_msi_addr = ks_dw_pcie_get_msi_addr, |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 300 | .msi_host_init = ks_dw_pcie_msi_host_init, |
| 301 | .scan_bus = ks_dw_pcie_v3_65_scan_bus, |
| 302 | }; |
| 303 | |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 304 | static irqreturn_t pcie_err_irq_handler(int irq, void *priv) |
| 305 | { |
| 306 | struct keystone_pcie *ks_pcie = priv; |
| 307 | |
| 308 | return ks_dw_pcie_handle_error_irq(ks_pcie->pp.dev, |
| 309 | ks_pcie->va_app_base); |
| 310 | } |
| 311 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 312 | static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie, |
| 313 | struct platform_device *pdev) |
| 314 | { |
| 315 | struct pcie_port *pp = &ks_pcie->pp; |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 316 | struct device *dev = pp->dev; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 317 | int ret; |
| 318 | |
| 319 | ret = ks_pcie_get_irq_controller_info(ks_pcie, |
| 320 | "legacy-interrupt-controller", |
| 321 | &ks_pcie->num_legacy_host_irqs); |
| 322 | if (ret) |
| 323 | return ret; |
| 324 | |
| 325 | if (IS_ENABLED(CONFIG_PCI_MSI)) { |
| 326 | ret = ks_pcie_get_irq_controller_info(ks_pcie, |
| 327 | "msi-interrupt-controller", |
| 328 | &ks_pcie->num_msi_host_irqs); |
| 329 | if (ret) |
| 330 | return ret; |
| 331 | } |
| 332 | |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 333 | /* |
| 334 | * Index 0 is the platform interrupt for error interrupt |
| 335 | * from RC. This is optional. |
| 336 | */ |
| 337 | ks_pcie->error_irq = irq_of_parse_and_map(ks_pcie->np, 0); |
| 338 | if (ks_pcie->error_irq <= 0) |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 339 | dev_info(dev, "no error IRQ defined\n"); |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 340 | else { |
Wei Yongjun | 8116acc | 2016-07-28 16:16:18 +0000 | [diff] [blame] | 341 | ret = request_irq(ks_pcie->error_irq, pcie_err_irq_handler, |
| 342 | IRQF_SHARED, "pcie-error-irq", ks_pcie); |
| 343 | if (ret < 0) { |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 344 | dev_err(dev, "failed to request error IRQ %d\n", |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 345 | ks_pcie->error_irq); |
| 346 | return ret; |
| 347 | } |
| 348 | } |
| 349 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 350 | pp->root_bus_nr = -1; |
| 351 | pp->ops = &keystone_pcie_host_ops; |
| 352 | ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np); |
| 353 | if (ret) { |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 354 | dev_err(dev, "failed to initialize host\n"); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 355 | return ret; |
| 356 | } |
| 357 | |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 358 | return 0; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | static const struct of_device_id ks_pcie_of_match[] = { |
| 362 | { |
| 363 | .type = "pci", |
| 364 | .compatible = "ti,keystone-pcie", |
| 365 | }, |
| 366 | { }, |
| 367 | }; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 368 | |
| 369 | static int __exit ks_pcie_remove(struct platform_device *pdev) |
| 370 | { |
| 371 | struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev); |
| 372 | |
| 373 | clk_disable_unprepare(ks_pcie->clk); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | static int __init ks_pcie_probe(struct platform_device *pdev) |
| 379 | { |
| 380 | struct device *dev = &pdev->dev; |
| 381 | struct keystone_pcie *ks_pcie; |
| 382 | struct pcie_port *pp; |
| 383 | struct resource *res; |
| 384 | void __iomem *reg_p; |
| 385 | struct phy *phy; |
Murali Karicheri | 1e9f8dc | 2016-04-11 10:50:31 -0400 | [diff] [blame] | 386 | int ret; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 387 | |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 388 | ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL); |
Jingoo Han | 6670070 | 2014-11-12 12:22:56 +0900 | [diff] [blame] | 389 | if (!ks_pcie) |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 390 | return -ENOMEM; |
Jingoo Han | 6670070 | 2014-11-12 12:22:56 +0900 | [diff] [blame] | 391 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 392 | pp = &ks_pcie->pp; |
Bjorn Helgaas | 21fa0c5 | 2016-10-11 22:48:42 -0500 | [diff] [blame^] | 393 | pp->dev = dev; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 394 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 395 | /* initialize SerDes Phy if present */ |
| 396 | phy = devm_phy_get(dev, "pcie-phy"); |
Shawn Lin | 25de15c9 | 2016-03-07 12:32:21 +0800 | [diff] [blame] | 397 | if (PTR_ERR_OR_ZERO(phy) == -EPROBE_DEFER) |
| 398 | return PTR_ERR(phy); |
| 399 | |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 400 | if (!IS_ERR_OR_NULL(phy)) { |
| 401 | ret = phy_init(phy); |
| 402 | if (ret < 0) |
| 403 | return ret; |
| 404 | } |
| 405 | |
Murali Karicheri | 4455efc | 2014-09-10 13:12:38 -0400 | [diff] [blame] | 406 | /* index 2 is to read PCI DEVICE_ID */ |
| 407 | res = platform_get_resource(pdev, IORESOURCE_MEM, 2); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 408 | reg_p = devm_ioremap_resource(dev, res); |
| 409 | if (IS_ERR(reg_p)) |
| 410 | return PTR_ERR(reg_p); |
Murali Karicheri | 8665a48 | 2014-09-10 13:12:39 -0400 | [diff] [blame] | 411 | ks_pcie->device_id = readl(reg_p) >> 16; |
| 412 | devm_iounmap(dev, reg_p); |
| 413 | devm_release_mem_region(dev, res->start, resource_size(res)); |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 414 | |
Murali Karicheri | 025dd3d | 2016-04-11 10:50:30 -0400 | [diff] [blame] | 415 | ks_pcie->np = dev->of_node; |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 416 | platform_set_drvdata(pdev, ks_pcie); |
| 417 | ks_pcie->clk = devm_clk_get(dev, "pcie"); |
| 418 | if (IS_ERR(ks_pcie->clk)) { |
| 419 | dev_err(dev, "Failed to get pcie rc clock\n"); |
| 420 | return PTR_ERR(ks_pcie->clk); |
| 421 | } |
| 422 | ret = clk_prepare_enable(ks_pcie->clk); |
| 423 | if (ret) |
| 424 | return ret; |
| 425 | |
| 426 | ret = ks_add_pcie_port(ks_pcie, pdev); |
| 427 | if (ret < 0) |
| 428 | goto fail_clk; |
| 429 | |
| 430 | return 0; |
| 431 | fail_clk: |
| 432 | clk_disable_unprepare(ks_pcie->clk); |
| 433 | |
| 434 | return ret; |
| 435 | } |
| 436 | |
| 437 | static struct platform_driver ks_pcie_driver __refdata = { |
| 438 | .probe = ks_pcie_probe, |
| 439 | .remove = __exit_p(ks_pcie_remove), |
| 440 | .driver = { |
| 441 | .name = "keystone-pcie", |
Murali Karicheri | 0c4ffcf | 2014-09-02 17:26:19 -0600 | [diff] [blame] | 442 | .of_match_table = of_match_ptr(ks_pcie_of_match), |
| 443 | }, |
| 444 | }; |
Paul Gortmaker | 1481bf2 | 2016-07-02 19:13:26 -0400 | [diff] [blame] | 445 | builtin_platform_driver(ks_pcie_driver); |