1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Rockchip AXI PCIe host controller driver 4 * 5 * Copyright (c) 2016 Rockchip, Inc. 6 * 7 * Author: Shawn Lin <shawn.lin@rock-chips.com> 8 * Wenrui Li <wenrui.li@rock-chips.com> 9 * 10 * Bits taken from Synopsys DesignWare Host controller driver and 11 * ARM PCI Host generic driver. 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/delay.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/of_pci.h> 18 #include <linux/phy/phy.h> 19 #include <linux/platform_device.h> 20 #include <linux/reset.h> 21 22 #include "../pci.h" 23 #include "pcie-rockchip.h" 24 25 int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip) 26 { 27 struct device *dev = rockchip->dev; 28 struct platform_device *pdev = to_platform_device(dev); 29 struct device_node *node = dev->of_node; 30 struct resource *regs; 31 int err; 32 33 if (rockchip->is_rc) { 34 regs = platform_get_resource_byname(pdev, 35 IORESOURCE_MEM, 36 "axi-base"); 37 rockchip->reg_base = devm_pci_remap_cfg_resource(dev, regs); 38 if (IS_ERR(rockchip->reg_base)) 39 return PTR_ERR(rockchip->reg_base); 40 } else { 41 rockchip->mem_res = 42 platform_get_resource_byname(pdev, IORESOURCE_MEM, 43 "mem-base"); 44 if (!rockchip->mem_res) 45 return -EINVAL; 46 } 47 48 rockchip->apb_base = 49 devm_platform_ioremap_resource_byname(pdev, "apb-base"); 50 if (IS_ERR(rockchip->apb_base)) 51 return PTR_ERR(rockchip->apb_base); 52 53 err = rockchip_pcie_get_phys(rockchip); 54 if (err) 55 return err; 56 57 rockchip->lanes = 1; 58 err = of_property_read_u32(node, "num-lanes", &rockchip->lanes); 59 if (!err && (rockchip->lanes == 0 || 60 rockchip->lanes == 3 || 61 rockchip->lanes > 4)) { 62 dev_warn(dev, "invalid num-lanes, default to use one lane\n"); 63 rockchip->lanes = 1; 64 } 65 66 rockchip->link_gen = of_pci_get_max_link_speed(node); 67 if (rockchip->link_gen < 0 || rockchip->link_gen > 2) 68 rockchip->link_gen = 2; 69 70 rockchip->core_rst = devm_reset_control_get_exclusive(dev, "core"); 71 if (IS_ERR(rockchip->core_rst)) { 72 if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER) 73 dev_err(dev, "missing core reset property in node\n"); 74 return PTR_ERR(rockchip->core_rst); 75 } 76 77 rockchip->mgmt_rst = devm_reset_control_get_exclusive(dev, "mgmt"); 78 if (IS_ERR(rockchip->mgmt_rst)) { 79 if (PTR_ERR(rockchip->mgmt_rst) != -EPROBE_DEFER) 80 dev_err(dev, "missing mgmt reset property in node\n"); 81 return PTR_ERR(rockchip->mgmt_rst); 82 } 83 84 rockchip->mgmt_sticky_rst = devm_reset_control_get_exclusive(dev, 85 "mgmt-sticky"); 86 if (IS_ERR(rockchip->mgmt_sticky_rst)) { 87 if (PTR_ERR(rockchip->mgmt_sticky_rst) != -EPROBE_DEFER) 88 dev_err(dev, "missing mgmt-sticky reset property in node\n"); 89 return PTR_ERR(rockchip->mgmt_sticky_rst); 90 } 91 92 rockchip->pipe_rst = devm_reset_control_get_exclusive(dev, "pipe"); 93 if (IS_ERR(rockchip->pipe_rst)) { 94 if (PTR_ERR(rockchip->pipe_rst) != -EPROBE_DEFER) 95 dev_err(dev, "missing pipe reset property in node\n"); 96 return PTR_ERR(rockchip->pipe_rst); 97 } 98 99 rockchip->pm_rst = devm_reset_control_get_exclusive(dev, "pm"); 100 if (IS_ERR(rockchip->pm_rst)) { 101 if (PTR_ERR(rockchip->pm_rst) != -EPROBE_DEFER) 102 dev_err(dev, "missing pm reset property in node\n"); 103 return PTR_ERR(rockchip->pm_rst); 104 } 105 106 rockchip->pclk_rst = devm_reset_control_get_exclusive(dev, "pclk"); 107 if (IS_ERR(rockchip->pclk_rst)) { 108 if (PTR_ERR(rockchip->pclk_rst) != -EPROBE_DEFER) 109 dev_err(dev, "missing pclk reset property in node\n"); 110 return PTR_ERR(rockchip->pclk_rst); 111 } 112 113 rockchip->aclk_rst = devm_reset_control_get_exclusive(dev, "aclk"); 114 if (IS_ERR(rockchip->aclk_rst)) { 115 if (PTR_ERR(rockchip->aclk_rst) != -EPROBE_DEFER) 116 dev_err(dev, "missing aclk reset property in node\n"); 117 return PTR_ERR(rockchip->aclk_rst); 118 } 119 120 if (rockchip->is_rc) { 121 rockchip->ep_gpio = devm_gpiod_get_optional(dev, "ep", 122 GPIOD_OUT_HIGH); 123 if (IS_ERR(rockchip->ep_gpio)) 124 return dev_err_probe(dev, PTR_ERR(rockchip->ep_gpio), 125 "failed to get ep GPIO\n"); 126 } 127 128 rockchip->aclk_pcie = devm_clk_get(dev, "aclk"); 129 if (IS_ERR(rockchip->aclk_pcie)) { 130 dev_err(dev, "aclk clock not found\n"); 131 return PTR_ERR(rockchip->aclk_pcie); 132 } 133 134 rockchip->aclk_perf_pcie = devm_clk_get(dev, "aclk-perf"); 135 if (IS_ERR(rockchip->aclk_perf_pcie)) { 136 dev_err(dev, "aclk_perf clock not found\n"); 137 return PTR_ERR(rockchip->aclk_perf_pcie); 138 } 139 140 rockchip->hclk_pcie = devm_clk_get(dev, "hclk"); 141 if (IS_ERR(rockchip->hclk_pcie)) { 142 dev_err(dev, "hclk clock not found\n"); 143 return PTR_ERR(rockchip->hclk_pcie); 144 } 145 146 rockchip->clk_pcie_pm = devm_clk_get(dev, "pm"); 147 if (IS_ERR(rockchip->clk_pcie_pm)) { 148 dev_err(dev, "pm clock not found\n"); 149 return PTR_ERR(rockchip->clk_pcie_pm); 150 } 151 152 return 0; 153 } 154 EXPORT_SYMBOL_GPL(rockchip_pcie_parse_dt); 155 156 int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) 157 { 158 struct device *dev = rockchip->dev; 159 int err, i; 160 u32 regs; 161 162 err = reset_control_assert(rockchip->aclk_rst); 163 if (err) { 164 dev_err(dev, "assert aclk_rst err %d\n", err); 165 return err; 166 } 167 168 err = reset_control_assert(rockchip->pclk_rst); 169 if (err) { 170 dev_err(dev, "assert pclk_rst err %d\n", err); 171 return err; 172 } 173 174 err = reset_control_assert(rockchip->pm_rst); 175 if (err) { 176 dev_err(dev, "assert pm_rst err %d\n", err); 177 return err; 178 } 179 180 for (i = 0; i < MAX_LANE_NUM; i++) { 181 err = phy_init(rockchip->phys[i]); 182 if (err) { 183 dev_err(dev, "init phy%d err %d\n", i, err); 184 goto err_exit_phy; 185 } 186 } 187 188 err = reset_control_assert(rockchip->core_rst); 189 if (err) { 190 dev_err(dev, "assert core_rst err %d\n", err); 191 goto err_exit_phy; 192 } 193 194 err = reset_control_assert(rockchip->mgmt_rst); 195 if (err) { 196 dev_err(dev, "assert mgmt_rst err %d\n", err); 197 goto err_exit_phy; 198 } 199 200 err = reset_control_assert(rockchip->mgmt_sticky_rst); 201 if (err) { 202 dev_err(dev, "assert mgmt_sticky_rst err %d\n", err); 203 goto err_exit_phy; 204 } 205 206 err = reset_control_assert(rockchip->pipe_rst); 207 if (err) { 208 dev_err(dev, "assert pipe_rst err %d\n", err); 209 goto err_exit_phy; 210 } 211 212 udelay(10); 213 214 err = reset_control_deassert(rockchip->pm_rst); 215 if (err) { 216 dev_err(dev, "deassert pm_rst err %d\n", err); 217 goto err_exit_phy; 218 } 219 220 err = reset_control_deassert(rockchip->aclk_rst); 221 if (err) { 222 dev_err(dev, "deassert aclk_rst err %d\n", err); 223 goto err_exit_phy; 224 } 225 226 err = reset_control_deassert(rockchip->pclk_rst); 227 if (err) { 228 dev_err(dev, "deassert pclk_rst err %d\n", err); 229 goto err_exit_phy; 230 } 231 232 if (rockchip->link_gen == 2) 233 rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2, 234 PCIE_CLIENT_CONFIG); 235 else 236 rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1, 237 PCIE_CLIENT_CONFIG); 238 239 regs = PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE | 240 PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes); 241 242 if (rockchip->is_rc) 243 regs |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC; 244 else 245 regs |= PCIE_CLIENT_CONF_DISABLE | PCIE_CLIENT_MODE_EP; 246 247 rockchip_pcie_write(rockchip, regs, PCIE_CLIENT_CONFIG); 248 249 for (i = 0; i < MAX_LANE_NUM; i++) { 250 err = phy_power_on(rockchip->phys[i]); 251 if (err) { 252 dev_err(dev, "power on phy%d err %d\n", i, err); 253 goto err_power_off_phy; 254 } 255 } 256 257 /* 258 * Please don't reorder the deassert sequence of the following 259 * four reset pins. 260 */ 261 err = reset_control_deassert(rockchip->mgmt_sticky_rst); 262 if (err) { 263 dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err); 264 goto err_power_off_phy; 265 } 266 267 err = reset_control_deassert(rockchip->core_rst); 268 if (err) { 269 dev_err(dev, "deassert core_rst err %d\n", err); 270 goto err_power_off_phy; 271 } 272 273 err = reset_control_deassert(rockchip->mgmt_rst); 274 if (err) { 275 dev_err(dev, "deassert mgmt_rst err %d\n", err); 276 goto err_power_off_phy; 277 } 278 279 err = reset_control_deassert(rockchip->pipe_rst); 280 if (err) { 281 dev_err(dev, "deassert pipe_rst err %d\n", err); 282 goto err_power_off_phy; 283 } 284 285 return 0; 286 err_power_off_phy: 287 while (i--) 288 phy_power_off(rockchip->phys[i]); 289 i = MAX_LANE_NUM; 290 err_exit_phy: 291 while (i--) 292 phy_exit(rockchip->phys[i]); 293 return err; 294 } 295 EXPORT_SYMBOL_GPL(rockchip_pcie_init_port); 296 297 int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip) 298 { 299 struct device *dev = rockchip->dev; 300 struct phy *phy; 301 char *name; 302 u32 i; 303 304 phy = devm_phy_get(dev, "pcie-phy"); 305 if (!IS_ERR(phy)) { 306 rockchip->legacy_phy = true; 307 rockchip->phys[0] = phy; 308 dev_warn(dev, "legacy phy model is deprecated!\n"); 309 return 0; 310 } 311 312 if (PTR_ERR(phy) == -EPROBE_DEFER) 313 return PTR_ERR(phy); 314 315 dev_dbg(dev, "missing legacy phy; search for per-lane PHY\n"); 316 317 for (i = 0; i < MAX_LANE_NUM; i++) { 318 name = kasprintf(GFP_KERNEL, "pcie-phy-%u", i); 319 if (!name) 320 return -ENOMEM; 321 322 phy = devm_of_phy_get(dev, dev->of_node, name); 323 kfree(name); 324 325 if (IS_ERR(phy)) { 326 if (PTR_ERR(phy) != -EPROBE_DEFER) 327 dev_err(dev, "missing phy for lane %d: %ld\n", 328 i, PTR_ERR(phy)); 329 return PTR_ERR(phy); 330 } 331 332 rockchip->phys[i] = phy; 333 } 334 335 return 0; 336 } 337 EXPORT_SYMBOL_GPL(rockchip_pcie_get_phys); 338 339 void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip) 340 { 341 int i; 342 343 for (i = 0; i < MAX_LANE_NUM; i++) { 344 /* inactive lanes are already powered off */ 345 if (rockchip->lanes_map & BIT(i)) 346 phy_power_off(rockchip->phys[i]); 347 phy_exit(rockchip->phys[i]); 348 } 349 } 350 EXPORT_SYMBOL_GPL(rockchip_pcie_deinit_phys); 351 352 int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip) 353 { 354 struct device *dev = rockchip->dev; 355 int err; 356 357 err = clk_prepare_enable(rockchip->aclk_pcie); 358 if (err) { 359 dev_err(dev, "unable to enable aclk_pcie clock\n"); 360 return err; 361 } 362 363 err = clk_prepare_enable(rockchip->aclk_perf_pcie); 364 if (err) { 365 dev_err(dev, "unable to enable aclk_perf_pcie clock\n"); 366 goto err_aclk_perf_pcie; 367 } 368 369 err = clk_prepare_enable(rockchip->hclk_pcie); 370 if (err) { 371 dev_err(dev, "unable to enable hclk_pcie clock\n"); 372 goto err_hclk_pcie; 373 } 374 375 err = clk_prepare_enable(rockchip->clk_pcie_pm); 376 if (err) { 377 dev_err(dev, "unable to enable clk_pcie_pm clock\n"); 378 goto err_clk_pcie_pm; 379 } 380 381 return 0; 382 383 err_clk_pcie_pm: 384 clk_disable_unprepare(rockchip->hclk_pcie); 385 err_hclk_pcie: 386 clk_disable_unprepare(rockchip->aclk_perf_pcie); 387 err_aclk_perf_pcie: 388 clk_disable_unprepare(rockchip->aclk_pcie); 389 return err; 390 } 391 EXPORT_SYMBOL_GPL(rockchip_pcie_enable_clocks); 392 393 void rockchip_pcie_disable_clocks(void *data) 394 { 395 struct rockchip_pcie *rockchip = data; 396 397 clk_disable_unprepare(rockchip->clk_pcie_pm); 398 clk_disable_unprepare(rockchip->hclk_pcie); 399 clk_disable_unprepare(rockchip->aclk_perf_pcie); 400 clk_disable_unprepare(rockchip->aclk_pcie); 401 } 402 EXPORT_SYMBOL_GPL(rockchip_pcie_disable_clocks); 403 404 void rockchip_pcie_cfg_configuration_accesses( 405 struct rockchip_pcie *rockchip, u32 type) 406 { 407 u32 ob_desc_0; 408 409 /* Configuration Accesses for region 0 */ 410 rockchip_pcie_write(rockchip, 0x0, PCIE_RC_BAR_CONF); 411 412 rockchip_pcie_write(rockchip, 413 (RC_REGION_0_ADDR_TRANS_L + RC_REGION_0_PASS_BITS), 414 PCIE_CORE_OB_REGION_ADDR0); 415 rockchip_pcie_write(rockchip, RC_REGION_0_ADDR_TRANS_H, 416 PCIE_CORE_OB_REGION_ADDR1); 417 ob_desc_0 = rockchip_pcie_read(rockchip, PCIE_CORE_OB_REGION_DESC0); 418 ob_desc_0 &= ~(RC_REGION_0_TYPE_MASK); 419 ob_desc_0 |= (type | (0x1 << 23)); 420 rockchip_pcie_write(rockchip, ob_desc_0, PCIE_CORE_OB_REGION_DESC0); 421 rockchip_pcie_write(rockchip, 0x0, PCIE_CORE_OB_REGION_DESC1); 422 } 423 EXPORT_SYMBOL_GPL(rockchip_pcie_cfg_configuration_accesses); 424