1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * PCIe host controller driver for Tegra194 SoC 4 * 5 * Copyright (C) 2019 NVIDIA Corporation. 6 * 7 * Author: Vidya Sagar <vidyas@nvidia.com> 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/debugfs.h> 12 #include <linux/delay.h> 13 #include <linux/gpio.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/interrupt.h> 16 #include <linux/iopoll.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/of_device.h> 21 #include <linux/of_gpio.h> 22 #include <linux/of_irq.h> 23 #include <linux/of_pci.h> 24 #include <linux/pci.h> 25 #include <linux/phy/phy.h> 26 #include <linux/pinctrl/consumer.h> 27 #include <linux/platform_device.h> 28 #include <linux/pm_runtime.h> 29 #include <linux/random.h> 30 #include <linux/reset.h> 31 #include <linux/resource.h> 32 #include <linux/types.h> 33 #include "pcie-designware.h" 34 #include <soc/tegra/bpmp.h> 35 #include <soc/tegra/bpmp-abi.h> 36 #include "../../pci.h" 37 38 #define APPL_PINMUX 0x0 39 #define APPL_PINMUX_PEX_RST BIT(0) 40 #define APPL_PINMUX_CLKREQ_OVERRIDE_EN BIT(2) 41 #define APPL_PINMUX_CLKREQ_OVERRIDE BIT(3) 42 #define APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN BIT(4) 43 #define APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE BIT(5) 44 45 #define APPL_CTRL 0x4 46 #define APPL_CTRL_SYS_PRE_DET_STATE BIT(6) 47 #define APPL_CTRL_LTSSM_EN BIT(7) 48 #define APPL_CTRL_HW_HOT_RST_EN BIT(20) 49 #define APPL_CTRL_HW_HOT_RST_MODE_MASK GENMASK(1, 0) 50 #define APPL_CTRL_HW_HOT_RST_MODE_SHIFT 22 51 #define APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST 0x1 52 53 #define APPL_INTR_EN_L0_0 0x8 54 #define APPL_INTR_EN_L0_0_LINK_STATE_INT_EN BIT(0) 55 #define APPL_INTR_EN_L0_0_MSI_RCV_INT_EN BIT(4) 56 #define APPL_INTR_EN_L0_0_INT_INT_EN BIT(8) 57 #define APPL_INTR_EN_L0_0_PCI_CMD_EN_INT_EN BIT(15) 58 #define APPL_INTR_EN_L0_0_CDM_REG_CHK_INT_EN BIT(19) 59 #define APPL_INTR_EN_L0_0_SYS_INTR_EN BIT(30) 60 #define APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN BIT(31) 61 62 #define APPL_INTR_STATUS_L0 0xC 63 #define APPL_INTR_STATUS_L0_LINK_STATE_INT BIT(0) 64 #define APPL_INTR_STATUS_L0_INT_INT BIT(8) 65 #define APPL_INTR_STATUS_L0_PCI_CMD_EN_INT BIT(15) 66 #define APPL_INTR_STATUS_L0_PEX_RST_INT BIT(16) 67 #define APPL_INTR_STATUS_L0_CDM_REG_CHK_INT BIT(18) 68 69 #define APPL_INTR_EN_L1_0_0 0x1C 70 #define APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN BIT(1) 71 #define APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN BIT(3) 72 #define APPL_INTR_EN_L1_0_0_HOT_RESET_DONE_INT_EN BIT(30) 73 74 #define APPL_INTR_STATUS_L1_0_0 0x20 75 #define APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED BIT(1) 76 #define APPL_INTR_STATUS_L1_0_0_RDLH_LINK_UP_CHGED BIT(3) 77 #define APPL_INTR_STATUS_L1_0_0_HOT_RESET_DONE BIT(30) 78 79 #define APPL_INTR_STATUS_L1_1 0x2C 80 #define APPL_INTR_STATUS_L1_2 0x30 81 #define APPL_INTR_STATUS_L1_3 0x34 82 #define APPL_INTR_STATUS_L1_6 0x3C 83 #define APPL_INTR_STATUS_L1_7 0x40 84 #define APPL_INTR_STATUS_L1_15_CFG_BME_CHGED BIT(1) 85 86 #define APPL_INTR_EN_L1_8_0 0x44 87 #define APPL_INTR_EN_L1_8_BW_MGT_INT_EN BIT(2) 88 #define APPL_INTR_EN_L1_8_AUTO_BW_INT_EN BIT(3) 89 #define APPL_INTR_EN_L1_8_INTX_EN BIT(11) 90 #define APPL_INTR_EN_L1_8_AER_INT_EN BIT(15) 91 92 #define APPL_INTR_STATUS_L1_8_0 0x4C 93 #define APPL_INTR_STATUS_L1_8_0_EDMA_INT_MASK GENMASK(11, 6) 94 #define APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS BIT(2) 95 #define APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS BIT(3) 96 97 #define APPL_INTR_STATUS_L1_9 0x54 98 #define APPL_INTR_STATUS_L1_10 0x58 99 #define APPL_INTR_STATUS_L1_11 0x64 100 #define APPL_INTR_STATUS_L1_13 0x74 101 #define APPL_INTR_STATUS_L1_14 0x78 102 #define APPL_INTR_STATUS_L1_15 0x7C 103 #define APPL_INTR_STATUS_L1_17 0x88 104 105 #define APPL_INTR_EN_L1_18 0x90 106 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_CMPLT BIT(2) 107 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_CMP_ERR BIT(1) 108 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_LOGIC_ERR BIT(0) 109 110 #define APPL_INTR_STATUS_L1_18 0x94 111 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT BIT(2) 112 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR BIT(1) 113 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR BIT(0) 114 115 #define APPL_MSI_CTRL_1 0xAC 116 117 #define APPL_MSI_CTRL_2 0xB0 118 119 #define APPL_LEGACY_INTX 0xB8 120 121 #define APPL_LTR_MSG_1 0xC4 122 #define LTR_MSG_REQ BIT(15) 123 #define LTR_MST_NO_SNOOP_SHIFT 16 124 125 #define APPL_LTR_MSG_2 0xC8 126 #define APPL_LTR_MSG_2_LTR_MSG_REQ_STATE BIT(3) 127 128 #define APPL_LINK_STATUS 0xCC 129 #define APPL_LINK_STATUS_RDLH_LINK_UP BIT(0) 130 131 #define APPL_DEBUG 0xD0 132 #define APPL_DEBUG_PM_LINKST_IN_L2_LAT BIT(21) 133 #define APPL_DEBUG_PM_LINKST_IN_L0 0x11 134 #define APPL_DEBUG_LTSSM_STATE_MASK GENMASK(8, 3) 135 #define APPL_DEBUG_LTSSM_STATE_SHIFT 3 136 #define LTSSM_STATE_PRE_DETECT 5 137 138 #define APPL_RADM_STATUS 0xE4 139 #define APPL_PM_XMT_TURNOFF_STATE BIT(0) 140 141 #define APPL_DM_TYPE 0x100 142 #define APPL_DM_TYPE_MASK GENMASK(3, 0) 143 #define APPL_DM_TYPE_RP 0x4 144 #define APPL_DM_TYPE_EP 0x0 145 146 #define APPL_CFG_BASE_ADDR 0x104 147 #define APPL_CFG_BASE_ADDR_MASK GENMASK(31, 12) 148 149 #define APPL_CFG_IATU_DMA_BASE_ADDR 0x108 150 #define APPL_CFG_IATU_DMA_BASE_ADDR_MASK GENMASK(31, 18) 151 152 #define APPL_CFG_MISC 0x110 153 #define APPL_CFG_MISC_SLV_EP_MODE BIT(14) 154 #define APPL_CFG_MISC_ARCACHE_MASK GENMASK(13, 10) 155 #define APPL_CFG_MISC_ARCACHE_SHIFT 10 156 #define APPL_CFG_MISC_ARCACHE_VAL 3 157 158 #define APPL_CFG_SLCG_OVERRIDE 0x114 159 #define APPL_CFG_SLCG_OVERRIDE_SLCG_EN_MASTER BIT(0) 160 161 #define APPL_CAR_RESET_OVRD 0x12C 162 #define APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N BIT(0) 163 164 #define IO_BASE_IO_DECODE BIT(0) 165 #define IO_BASE_IO_DECODE_BIT8 BIT(8) 166 167 #define CFG_PREF_MEM_LIMIT_BASE_MEM_DECODE BIT(0) 168 #define CFG_PREF_MEM_LIMIT_BASE_MEM_LIMIT_DECODE BIT(16) 169 170 #define CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF 0x718 171 #define CFG_TIMER_CTRL_ACK_NAK_SHIFT (19) 172 173 #define EVENT_COUNTER_ALL_CLEAR 0x3 174 #define EVENT_COUNTER_ENABLE_ALL 0x7 175 #define EVENT_COUNTER_ENABLE_SHIFT 2 176 #define EVENT_COUNTER_EVENT_SEL_MASK GENMASK(7, 0) 177 #define EVENT_COUNTER_EVENT_SEL_SHIFT 16 178 #define EVENT_COUNTER_EVENT_Tx_L0S 0x2 179 #define EVENT_COUNTER_EVENT_Rx_L0S 0x3 180 #define EVENT_COUNTER_EVENT_L1 0x5 181 #define EVENT_COUNTER_EVENT_L1_1 0x7 182 #define EVENT_COUNTER_EVENT_L1_2 0x8 183 #define EVENT_COUNTER_GROUP_SEL_SHIFT 24 184 #define EVENT_COUNTER_GROUP_5 0x5 185 186 #define N_FTS_VAL 52 187 #define FTS_VAL 52 188 189 #define PORT_LOGIC_MSI_CTRL_INT_0_EN 0x828 190 191 #define GEN3_EQ_CONTROL_OFF 0x8a8 192 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT 8 193 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK GENMASK(23, 8) 194 #define GEN3_EQ_CONTROL_OFF_FB_MODE_MASK GENMASK(3, 0) 195 196 #define GEN3_RELATED_OFF 0x890 197 #define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0) 198 #define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16) 199 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24 200 #define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24) 201 202 #define PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT 0x8D0 203 #define AMBA_ERROR_RESPONSE_CRS_SHIFT 3 204 #define AMBA_ERROR_RESPONSE_CRS_MASK GENMASK(1, 0) 205 #define AMBA_ERROR_RESPONSE_CRS_OKAY 0 206 #define AMBA_ERROR_RESPONSE_CRS_OKAY_FFFFFFFF 1 207 #define AMBA_ERROR_RESPONSE_CRS_OKAY_FFFF0001 2 208 209 #define MSIX_ADDR_MATCH_LOW_OFF 0x940 210 #define MSIX_ADDR_MATCH_LOW_OFF_EN BIT(0) 211 #define MSIX_ADDR_MATCH_LOW_OFF_MASK GENMASK(31, 2) 212 213 #define MSIX_ADDR_MATCH_HIGH_OFF 0x944 214 #define MSIX_ADDR_MATCH_HIGH_OFF_MASK GENMASK(31, 0) 215 216 #define PORT_LOGIC_MSIX_DOORBELL 0x948 217 218 #define CAP_SPCIE_CAP_OFF 0x154 219 #define CAP_SPCIE_CAP_OFF_DSP_TX_PRESET0_MASK GENMASK(3, 0) 220 #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK GENMASK(11, 8) 221 #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT 8 222 223 #define PME_ACK_TIMEOUT 10000 224 225 #define LTSSM_TIMEOUT 50000 /* 50ms */ 226 227 #define GEN3_GEN4_EQ_PRESET_INIT 5 228 229 #define GEN1_CORE_CLK_FREQ 62500000 230 #define GEN2_CORE_CLK_FREQ 125000000 231 #define GEN3_CORE_CLK_FREQ 250000000 232 #define GEN4_CORE_CLK_FREQ 500000000 233 234 #define LTR_MSG_TIMEOUT (100 * 1000) 235 236 #define PERST_DEBOUNCE_TIME (5 * 1000) 237 238 #define EP_STATE_DISABLED 0 239 #define EP_STATE_ENABLED 1 240 241 static const unsigned int pcie_gen_freq[] = { 242 GEN1_CORE_CLK_FREQ, 243 GEN2_CORE_CLK_FREQ, 244 GEN3_CORE_CLK_FREQ, 245 GEN4_CORE_CLK_FREQ 246 }; 247 248 static const u32 event_cntr_ctrl_offset[] = { 249 0x1d8, 250 0x1a8, 251 0x1a8, 252 0x1a8, 253 0x1c4, 254 0x1d8 255 }; 256 257 static const u32 event_cntr_data_offset[] = { 258 0x1dc, 259 0x1ac, 260 0x1ac, 261 0x1ac, 262 0x1c8, 263 0x1dc 264 }; 265 266 struct tegra_pcie_dw { 267 struct device *dev; 268 struct resource *appl_res; 269 struct resource *dbi_res; 270 struct resource *atu_dma_res; 271 void __iomem *appl_base; 272 struct clk *core_clk; 273 struct reset_control *core_apb_rst; 274 struct reset_control *core_rst; 275 struct dw_pcie pci; 276 struct tegra_bpmp *bpmp; 277 278 enum dw_pcie_device_mode mode; 279 280 bool supports_clkreq; 281 bool enable_cdm_check; 282 bool link_state; 283 bool update_fc_fixup; 284 u8 init_link_width; 285 u32 msi_ctrl_int; 286 u32 num_lanes; 287 u32 cid; 288 u32 cfg_link_cap_l1sub; 289 u32 pcie_cap_base; 290 u32 aspm_cmrt; 291 u32 aspm_pwr_on_t; 292 u32 aspm_l0s_enter_lat; 293 294 struct regulator *pex_ctl_supply; 295 struct regulator *slot_ctl_3v3; 296 struct regulator *slot_ctl_12v; 297 298 unsigned int phy_count; 299 struct phy **phys; 300 301 struct dentry *debugfs; 302 303 /* Endpoint mode specific */ 304 struct gpio_desc *pex_rst_gpiod; 305 struct gpio_desc *pex_refclk_sel_gpiod; 306 unsigned int pex_rst_irq; 307 int ep_state; 308 }; 309 310 struct tegra_pcie_dw_of_data { 311 enum dw_pcie_device_mode mode; 312 }; 313 314 static inline struct tegra_pcie_dw *to_tegra_pcie(struct dw_pcie *pci) 315 { 316 return container_of(pci, struct tegra_pcie_dw, pci); 317 } 318 319 static inline void appl_writel(struct tegra_pcie_dw *pcie, const u32 value, 320 const u32 reg) 321 { 322 writel_relaxed(value, pcie->appl_base + reg); 323 } 324 325 static inline u32 appl_readl(struct tegra_pcie_dw *pcie, const u32 reg) 326 { 327 return readl_relaxed(pcie->appl_base + reg); 328 } 329 330 struct tegra_pcie_soc { 331 enum dw_pcie_device_mode mode; 332 }; 333 334 static void apply_bad_link_workaround(struct pcie_port *pp) 335 { 336 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 337 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 338 u32 current_link_width; 339 u16 val; 340 341 /* 342 * NOTE:- Since this scenario is uncommon and link as such is not 343 * stable anyway, not waiting to confirm if link is really 344 * transitioning to Gen-2 speed 345 */ 346 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); 347 if (val & PCI_EXP_LNKSTA_LBMS) { 348 current_link_width = (val & PCI_EXP_LNKSTA_NLW) >> 349 PCI_EXP_LNKSTA_NLW_SHIFT; 350 if (pcie->init_link_width > current_link_width) { 351 dev_warn(pci->dev, "PCIe link is bad, width reduced\n"); 352 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + 353 PCI_EXP_LNKCTL2); 354 val &= ~PCI_EXP_LNKCTL2_TLS; 355 val |= PCI_EXP_LNKCTL2_TLS_2_5GT; 356 dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + 357 PCI_EXP_LNKCTL2, val); 358 359 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + 360 PCI_EXP_LNKCTL); 361 val |= PCI_EXP_LNKCTL_RL; 362 dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + 363 PCI_EXP_LNKCTL, val); 364 } 365 } 366 } 367 368 static irqreturn_t tegra_pcie_rp_irq_handler(int irq, void *arg) 369 { 370 struct tegra_pcie_dw *pcie = arg; 371 struct dw_pcie *pci = &pcie->pci; 372 struct pcie_port *pp = &pci->pp; 373 u32 val, tmp; 374 u16 val_w; 375 376 val = appl_readl(pcie, APPL_INTR_STATUS_L0); 377 if (val & APPL_INTR_STATUS_L0_LINK_STATE_INT) { 378 val = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0); 379 if (val & APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED) { 380 appl_writel(pcie, val, APPL_INTR_STATUS_L1_0_0); 381 382 /* SBR & Surprise Link Down WAR */ 383 val = appl_readl(pcie, APPL_CAR_RESET_OVRD); 384 val &= ~APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N; 385 appl_writel(pcie, val, APPL_CAR_RESET_OVRD); 386 udelay(1); 387 val = appl_readl(pcie, APPL_CAR_RESET_OVRD); 388 val |= APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N; 389 appl_writel(pcie, val, APPL_CAR_RESET_OVRD); 390 391 val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); 392 val |= PORT_LOGIC_SPEED_CHANGE; 393 dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); 394 } 395 } 396 397 if (val & APPL_INTR_STATUS_L0_INT_INT) { 398 val = appl_readl(pcie, APPL_INTR_STATUS_L1_8_0); 399 if (val & APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS) { 400 appl_writel(pcie, 401 APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS, 402 APPL_INTR_STATUS_L1_8_0); 403 apply_bad_link_workaround(pp); 404 } 405 if (val & APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS) { 406 appl_writel(pcie, 407 APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS, 408 APPL_INTR_STATUS_L1_8_0); 409 410 val_w = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + 411 PCI_EXP_LNKSTA); 412 dev_dbg(pci->dev, "Link Speed : Gen-%u\n", val_w & 413 PCI_EXP_LNKSTA_CLS); 414 } 415 } 416 417 val = appl_readl(pcie, APPL_INTR_STATUS_L0); 418 if (val & APPL_INTR_STATUS_L0_CDM_REG_CHK_INT) { 419 val = appl_readl(pcie, APPL_INTR_STATUS_L1_18); 420 tmp = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS); 421 if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT) { 422 dev_info(pci->dev, "CDM check complete\n"); 423 tmp |= PCIE_PL_CHK_REG_CHK_REG_COMPLETE; 424 } 425 if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR) { 426 dev_err(pci->dev, "CDM comparison mismatch\n"); 427 tmp |= PCIE_PL_CHK_REG_CHK_REG_COMPARISON_ERROR; 428 } 429 if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR) { 430 dev_err(pci->dev, "CDM Logic error\n"); 431 tmp |= PCIE_PL_CHK_REG_CHK_REG_LOGIC_ERROR; 432 } 433 dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, tmp); 434 tmp = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_ERR_ADDR); 435 dev_err(pci->dev, "CDM Error Address Offset = 0x%08X\n", tmp); 436 } 437 438 return IRQ_HANDLED; 439 } 440 441 static void pex_ep_event_hot_rst_done(struct tegra_pcie_dw *pcie) 442 { 443 u32 val; 444 445 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0); 446 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0); 447 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1); 448 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2); 449 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3); 450 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6); 451 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7); 452 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0); 453 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9); 454 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10); 455 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11); 456 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13); 457 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14); 458 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15); 459 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17); 460 appl_writel(pcie, 0xFFFFFFFF, APPL_MSI_CTRL_2); 461 462 val = appl_readl(pcie, APPL_CTRL); 463 val |= APPL_CTRL_LTSSM_EN; 464 appl_writel(pcie, val, APPL_CTRL); 465 } 466 467 static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg) 468 { 469 struct tegra_pcie_dw *pcie = arg; 470 struct dw_pcie *pci = &pcie->pci; 471 u32 val, speed; 472 473 speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) & 474 PCI_EXP_LNKSTA_CLS; 475 clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]); 476 477 /* If EP doesn't advertise L1SS, just return */ 478 val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub); 479 if (!(val & (PCI_L1SS_CAP_ASPM_L1_1 | PCI_L1SS_CAP_ASPM_L1_2))) 480 return IRQ_HANDLED; 481 482 /* Check if BME is set to '1' */ 483 val = dw_pcie_readl_dbi(pci, PCI_COMMAND); 484 if (val & PCI_COMMAND_MASTER) { 485 ktime_t timeout; 486 487 /* 110us for both snoop and no-snoop */ 488 val = 110 | (2 << PCI_LTR_SCALE_SHIFT) | LTR_MSG_REQ; 489 val |= (val << LTR_MST_NO_SNOOP_SHIFT); 490 appl_writel(pcie, val, APPL_LTR_MSG_1); 491 492 /* Send LTR upstream */ 493 val = appl_readl(pcie, APPL_LTR_MSG_2); 494 val |= APPL_LTR_MSG_2_LTR_MSG_REQ_STATE; 495 appl_writel(pcie, val, APPL_LTR_MSG_2); 496 497 timeout = ktime_add_us(ktime_get(), LTR_MSG_TIMEOUT); 498 for (;;) { 499 val = appl_readl(pcie, APPL_LTR_MSG_2); 500 if (!(val & APPL_LTR_MSG_2_LTR_MSG_REQ_STATE)) 501 break; 502 if (ktime_after(ktime_get(), timeout)) 503 break; 504 usleep_range(1000, 1100); 505 } 506 if (val & APPL_LTR_MSG_2_LTR_MSG_REQ_STATE) 507 dev_err(pcie->dev, "Failed to send LTR message\n"); 508 } 509 510 return IRQ_HANDLED; 511 } 512 513 static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg) 514 { 515 struct tegra_pcie_dw *pcie = arg; 516 struct dw_pcie_ep *ep = &pcie->pci.ep; 517 int spurious = 1; 518 u32 val, tmp; 519 520 val = appl_readl(pcie, APPL_INTR_STATUS_L0); 521 if (val & APPL_INTR_STATUS_L0_LINK_STATE_INT) { 522 val = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0); 523 appl_writel(pcie, val, APPL_INTR_STATUS_L1_0_0); 524 525 if (val & APPL_INTR_STATUS_L1_0_0_HOT_RESET_DONE) 526 pex_ep_event_hot_rst_done(pcie); 527 528 if (val & APPL_INTR_STATUS_L1_0_0_RDLH_LINK_UP_CHGED) { 529 tmp = appl_readl(pcie, APPL_LINK_STATUS); 530 if (tmp & APPL_LINK_STATUS_RDLH_LINK_UP) { 531 dev_dbg(pcie->dev, "Link is up with Host\n"); 532 dw_pcie_ep_linkup(ep); 533 } 534 } 535 536 spurious = 0; 537 } 538 539 if (val & APPL_INTR_STATUS_L0_PCI_CMD_EN_INT) { 540 val = appl_readl(pcie, APPL_INTR_STATUS_L1_15); 541 appl_writel(pcie, val, APPL_INTR_STATUS_L1_15); 542 543 if (val & APPL_INTR_STATUS_L1_15_CFG_BME_CHGED) 544 return IRQ_WAKE_THREAD; 545 546 spurious = 0; 547 } 548 549 if (spurious) { 550 dev_warn(pcie->dev, "Random interrupt (STATUS = 0x%08X)\n", 551 val); 552 appl_writel(pcie, val, APPL_INTR_STATUS_L0); 553 } 554 555 return IRQ_HANDLED; 556 } 557 558 static int tegra_pcie_dw_rd_own_conf(struct pci_bus *bus, u32 devfn, int where, 559 int size, u32 *val) 560 { 561 /* 562 * This is an endpoint mode specific register happen to appear even 563 * when controller is operating in root port mode and system hangs 564 * when it is accessed with link being in ASPM-L1 state. 565 * So skip accessing it altogether 566 */ 567 if (!PCI_SLOT(devfn) && where == PORT_LOGIC_MSIX_DOORBELL) { 568 *val = 0x00000000; 569 return PCIBIOS_SUCCESSFUL; 570 } 571 572 return pci_generic_config_read(bus, devfn, where, size, val); 573 } 574 575 static int tegra_pcie_dw_wr_own_conf(struct pci_bus *bus, u32 devfn, int where, 576 int size, u32 val) 577 { 578 /* 579 * This is an endpoint mode specific register happen to appear even 580 * when controller is operating in root port mode and system hangs 581 * when it is accessed with link being in ASPM-L1 state. 582 * So skip accessing it altogether 583 */ 584 if (!PCI_SLOT(devfn) && where == PORT_LOGIC_MSIX_DOORBELL) 585 return PCIBIOS_SUCCESSFUL; 586 587 return pci_generic_config_write(bus, devfn, where, size, val); 588 } 589 590 static struct pci_ops tegra_pci_ops = { 591 .map_bus = dw_pcie_own_conf_map_bus, 592 .read = tegra_pcie_dw_rd_own_conf, 593 .write = tegra_pcie_dw_wr_own_conf, 594 }; 595 596 #if defined(CONFIG_PCIEASPM) 597 static void disable_aspm_l11(struct tegra_pcie_dw *pcie) 598 { 599 u32 val; 600 601 val = dw_pcie_readl_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub); 602 val &= ~PCI_L1SS_CAP_ASPM_L1_1; 603 dw_pcie_writel_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub, val); 604 } 605 606 static void disable_aspm_l12(struct tegra_pcie_dw *pcie) 607 { 608 u32 val; 609 610 val = dw_pcie_readl_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub); 611 val &= ~PCI_L1SS_CAP_ASPM_L1_2; 612 dw_pcie_writel_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub, val); 613 } 614 615 static inline u32 event_counter_prog(struct tegra_pcie_dw *pcie, u32 event) 616 { 617 u32 val; 618 619 val = dw_pcie_readl_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid]); 620 val &= ~(EVENT_COUNTER_EVENT_SEL_MASK << EVENT_COUNTER_EVENT_SEL_SHIFT); 621 val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT; 622 val |= event << EVENT_COUNTER_EVENT_SEL_SHIFT; 623 val |= EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT; 624 dw_pcie_writel_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid], val); 625 val = dw_pcie_readl_dbi(&pcie->pci, event_cntr_data_offset[pcie->cid]); 626 627 return val; 628 } 629 630 static int aspm_state_cnt(struct seq_file *s, void *data) 631 { 632 struct tegra_pcie_dw *pcie = (struct tegra_pcie_dw *) 633 dev_get_drvdata(s->private); 634 u32 val; 635 636 seq_printf(s, "Tx L0s entry count : %u\n", 637 event_counter_prog(pcie, EVENT_COUNTER_EVENT_Tx_L0S)); 638 639 seq_printf(s, "Rx L0s entry count : %u\n", 640 event_counter_prog(pcie, EVENT_COUNTER_EVENT_Rx_L0S)); 641 642 seq_printf(s, "Link L1 entry count : %u\n", 643 event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1)); 644 645 seq_printf(s, "Link L1.1 entry count : %u\n", 646 event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1_1)); 647 648 seq_printf(s, "Link L1.2 entry count : %u\n", 649 event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1_2)); 650 651 /* Clear all counters */ 652 dw_pcie_writel_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid], 653 EVENT_COUNTER_ALL_CLEAR); 654 655 /* Re-enable counting */ 656 val = EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT; 657 val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT; 658 dw_pcie_writel_dbi(&pcie->pci, event_cntr_ctrl_offset[pcie->cid], val); 659 660 return 0; 661 } 662 663 static void init_host_aspm(struct tegra_pcie_dw *pcie) 664 { 665 struct dw_pcie *pci = &pcie->pci; 666 u32 val; 667 668 val = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS); 669 pcie->cfg_link_cap_l1sub = val + PCI_L1SS_CAP; 670 671 /* Enable ASPM counters */ 672 val = EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT; 673 val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT; 674 dw_pcie_writel_dbi(pci, event_cntr_ctrl_offset[pcie->cid], val); 675 676 /* Program T_cmrt and T_pwr_on values */ 677 val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub); 678 val &= ~(PCI_L1SS_CAP_CM_RESTORE_TIME | PCI_L1SS_CAP_P_PWR_ON_VALUE); 679 val |= (pcie->aspm_cmrt << 8); 680 val |= (pcie->aspm_pwr_on_t << 19); 681 dw_pcie_writel_dbi(pci, pcie->cfg_link_cap_l1sub, val); 682 683 /* Program L0s and L1 entrance latencies */ 684 val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR); 685 val &= ~PORT_AFR_L0S_ENTRANCE_LAT_MASK; 686 val |= (pcie->aspm_l0s_enter_lat << PORT_AFR_L0S_ENTRANCE_LAT_SHIFT); 687 val |= PORT_AFR_ENTER_ASPM; 688 dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val); 689 } 690 691 static void init_debugfs(struct tegra_pcie_dw *pcie) 692 { 693 debugfs_create_devm_seqfile(pcie->dev, "aspm_state_cnt", pcie->debugfs, 694 aspm_state_cnt); 695 } 696 #else 697 static inline void disable_aspm_l12(struct tegra_pcie_dw *pcie) { return; } 698 static inline void disable_aspm_l11(struct tegra_pcie_dw *pcie) { return; } 699 static inline void init_host_aspm(struct tegra_pcie_dw *pcie) { return; } 700 static inline void init_debugfs(struct tegra_pcie_dw *pcie) { return; } 701 #endif 702 703 static void tegra_pcie_enable_system_interrupts(struct pcie_port *pp) 704 { 705 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 706 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 707 u32 val; 708 u16 val_w; 709 710 val = appl_readl(pcie, APPL_INTR_EN_L0_0); 711 val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN; 712 appl_writel(pcie, val, APPL_INTR_EN_L0_0); 713 714 val = appl_readl(pcie, APPL_INTR_EN_L1_0_0); 715 val |= APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN; 716 appl_writel(pcie, val, APPL_INTR_EN_L1_0_0); 717 718 if (pcie->enable_cdm_check) { 719 val = appl_readl(pcie, APPL_INTR_EN_L0_0); 720 val |= APPL_INTR_EN_L0_0_CDM_REG_CHK_INT_EN; 721 appl_writel(pcie, val, APPL_INTR_EN_L0_0); 722 723 val = appl_readl(pcie, APPL_INTR_EN_L1_18); 724 val |= APPL_INTR_EN_L1_18_CDM_REG_CHK_CMP_ERR; 725 val |= APPL_INTR_EN_L1_18_CDM_REG_CHK_LOGIC_ERR; 726 appl_writel(pcie, val, APPL_INTR_EN_L1_18); 727 } 728 729 val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base + 730 PCI_EXP_LNKSTA); 731 pcie->init_link_width = (val_w & PCI_EXP_LNKSTA_NLW) >> 732 PCI_EXP_LNKSTA_NLW_SHIFT; 733 734 val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base + 735 PCI_EXP_LNKCTL); 736 val_w |= PCI_EXP_LNKCTL_LBMIE; 737 dw_pcie_writew_dbi(&pcie->pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL, 738 val_w); 739 } 740 741 static void tegra_pcie_enable_legacy_interrupts(struct pcie_port *pp) 742 { 743 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 744 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 745 u32 val; 746 747 /* Enable legacy interrupt generation */ 748 val = appl_readl(pcie, APPL_INTR_EN_L0_0); 749 val |= APPL_INTR_EN_L0_0_SYS_INTR_EN; 750 val |= APPL_INTR_EN_L0_0_INT_INT_EN; 751 appl_writel(pcie, val, APPL_INTR_EN_L0_0); 752 753 val = appl_readl(pcie, APPL_INTR_EN_L1_8_0); 754 val |= APPL_INTR_EN_L1_8_INTX_EN; 755 val |= APPL_INTR_EN_L1_8_AUTO_BW_INT_EN; 756 val |= APPL_INTR_EN_L1_8_BW_MGT_INT_EN; 757 if (IS_ENABLED(CONFIG_PCIEAER)) 758 val |= APPL_INTR_EN_L1_8_AER_INT_EN; 759 appl_writel(pcie, val, APPL_INTR_EN_L1_8_0); 760 } 761 762 static void tegra_pcie_enable_msi_interrupts(struct pcie_port *pp) 763 { 764 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 765 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 766 u32 val; 767 768 dw_pcie_msi_init(pp); 769 770 /* Enable MSI interrupt generation */ 771 val = appl_readl(pcie, APPL_INTR_EN_L0_0); 772 val |= APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN; 773 val |= APPL_INTR_EN_L0_0_MSI_RCV_INT_EN; 774 appl_writel(pcie, val, APPL_INTR_EN_L0_0); 775 } 776 777 static void tegra_pcie_enable_interrupts(struct pcie_port *pp) 778 { 779 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 780 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 781 782 /* Clear interrupt statuses before enabling interrupts */ 783 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0); 784 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0); 785 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1); 786 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2); 787 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3); 788 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6); 789 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7); 790 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0); 791 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9); 792 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10); 793 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11); 794 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13); 795 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14); 796 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15); 797 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17); 798 799 tegra_pcie_enable_system_interrupts(pp); 800 tegra_pcie_enable_legacy_interrupts(pp); 801 if (IS_ENABLED(CONFIG_PCI_MSI)) 802 tegra_pcie_enable_msi_interrupts(pp); 803 } 804 805 static void config_gen3_gen4_eq_presets(struct tegra_pcie_dw *pcie) 806 { 807 struct dw_pcie *pci = &pcie->pci; 808 u32 val, offset, i; 809 810 /* Program init preset */ 811 for (i = 0; i < pcie->num_lanes; i++) { 812 val = dw_pcie_readw_dbi(pci, CAP_SPCIE_CAP_OFF + (i * 2)); 813 val &= ~CAP_SPCIE_CAP_OFF_DSP_TX_PRESET0_MASK; 814 val |= GEN3_GEN4_EQ_PRESET_INIT; 815 val &= ~CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK; 816 val |= (GEN3_GEN4_EQ_PRESET_INIT << 817 CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT); 818 dw_pcie_writew_dbi(pci, CAP_SPCIE_CAP_OFF + (i * 2), val); 819 820 offset = dw_pcie_find_ext_capability(pci, 821 PCI_EXT_CAP_ID_PL_16GT) + 822 PCI_PL_16GT_LE_CTRL; 823 val = dw_pcie_readb_dbi(pci, offset + i); 824 val &= ~PCI_PL_16GT_LE_CTRL_DSP_TX_PRESET_MASK; 825 val |= GEN3_GEN4_EQ_PRESET_INIT; 826 val &= ~PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_MASK; 827 val |= (GEN3_GEN4_EQ_PRESET_INIT << 828 PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_SHIFT); 829 dw_pcie_writeb_dbi(pci, offset + i, val); 830 } 831 832 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); 833 val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; 834 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); 835 836 val = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); 837 val &= ~GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK; 838 val |= (0x3ff << GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT); 839 val &= ~GEN3_EQ_CONTROL_OFF_FB_MODE_MASK; 840 dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, val); 841 842 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); 843 val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; 844 val |= (0x1 << GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT); 845 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); 846 847 val = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); 848 val &= ~GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK; 849 val |= (0x360 << GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT); 850 val &= ~GEN3_EQ_CONTROL_OFF_FB_MODE_MASK; 851 dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, val); 852 853 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); 854 val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; 855 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); 856 } 857 858 static void tegra_pcie_prepare_host(struct pcie_port *pp) 859 { 860 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 861 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 862 u32 val; 863 864 val = dw_pcie_readl_dbi(pci, PCI_IO_BASE); 865 val &= ~(IO_BASE_IO_DECODE | IO_BASE_IO_DECODE_BIT8); 866 dw_pcie_writel_dbi(pci, PCI_IO_BASE, val); 867 868 val = dw_pcie_readl_dbi(pci, PCI_PREF_MEMORY_BASE); 869 val |= CFG_PREF_MEM_LIMIT_BASE_MEM_DECODE; 870 val |= CFG_PREF_MEM_LIMIT_BASE_MEM_LIMIT_DECODE; 871 dw_pcie_writel_dbi(pci, PCI_PREF_MEMORY_BASE, val); 872 873 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0); 874 875 /* Enable as 0xFFFF0001 response for CRS */ 876 val = dw_pcie_readl_dbi(pci, PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT); 877 val &= ~(AMBA_ERROR_RESPONSE_CRS_MASK << AMBA_ERROR_RESPONSE_CRS_SHIFT); 878 val |= (AMBA_ERROR_RESPONSE_CRS_OKAY_FFFF0001 << 879 AMBA_ERROR_RESPONSE_CRS_SHIFT); 880 dw_pcie_writel_dbi(pci, PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT, val); 881 882 /* Configure Max lane width from DT */ 883 val = dw_pcie_readl_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCAP); 884 val &= ~PCI_EXP_LNKCAP_MLW; 885 val |= (pcie->num_lanes << PCI_EXP_LNKSTA_NLW_SHIFT); 886 dw_pcie_writel_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCAP, val); 887 888 config_gen3_gen4_eq_presets(pcie); 889 890 init_host_aspm(pcie); 891 892 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); 893 val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; 894 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); 895 896 if (pcie->update_fc_fixup) { 897 val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF); 898 val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT; 899 dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF, val); 900 } 901 902 dw_pcie_setup_rc(pp); 903 904 clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ); 905 906 /* Assert RST */ 907 val = appl_readl(pcie, APPL_PINMUX); 908 val &= ~APPL_PINMUX_PEX_RST; 909 appl_writel(pcie, val, APPL_PINMUX); 910 911 usleep_range(100, 200); 912 913 /* Enable LTSSM */ 914 val = appl_readl(pcie, APPL_CTRL); 915 val |= APPL_CTRL_LTSSM_EN; 916 appl_writel(pcie, val, APPL_CTRL); 917 918 /* De-assert RST */ 919 val = appl_readl(pcie, APPL_PINMUX); 920 val |= APPL_PINMUX_PEX_RST; 921 appl_writel(pcie, val, APPL_PINMUX); 922 923 msleep(100); 924 } 925 926 static int tegra_pcie_dw_host_init(struct pcie_port *pp) 927 { 928 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 929 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 930 u32 val, tmp, offset, speed; 931 932 pp->bridge->ops = &tegra_pci_ops; 933 934 tegra_pcie_prepare_host(pp); 935 936 if (dw_pcie_wait_for_link(pci)) { 937 /* 938 * There are some endpoints which can't get the link up if 939 * root port has Data Link Feature (DLF) enabled. 940 * Refer Spec rev 4.0 ver 1.0 sec 3.4.2 & 7.7.4 for more info 941 * on Scaled Flow Control and DLF. 942 * So, need to confirm that is indeed the case here and attempt 943 * link up once again with DLF disabled. 944 */ 945 val = appl_readl(pcie, APPL_DEBUG); 946 val &= APPL_DEBUG_LTSSM_STATE_MASK; 947 val >>= APPL_DEBUG_LTSSM_STATE_SHIFT; 948 tmp = appl_readl(pcie, APPL_LINK_STATUS); 949 tmp &= APPL_LINK_STATUS_RDLH_LINK_UP; 950 if (!(val == 0x11 && !tmp)) { 951 /* Link is down for all good reasons */ 952 return 0; 953 } 954 955 dev_info(pci->dev, "Link is down in DLL"); 956 dev_info(pci->dev, "Trying again with DLFE disabled\n"); 957 /* Disable LTSSM */ 958 val = appl_readl(pcie, APPL_CTRL); 959 val &= ~APPL_CTRL_LTSSM_EN; 960 appl_writel(pcie, val, APPL_CTRL); 961 962 reset_control_assert(pcie->core_rst); 963 reset_control_deassert(pcie->core_rst); 964 965 offset = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_DLF); 966 val = dw_pcie_readl_dbi(pci, offset + PCI_DLF_CAP); 967 val &= ~PCI_DLF_EXCHANGE_ENABLE; 968 dw_pcie_writel_dbi(pci, offset, val); 969 970 tegra_pcie_prepare_host(pp); 971 972 if (dw_pcie_wait_for_link(pci)) 973 return 0; 974 } 975 976 speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) & 977 PCI_EXP_LNKSTA_CLS; 978 clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]); 979 980 tegra_pcie_enable_interrupts(pp); 981 982 return 0; 983 } 984 985 static int tegra_pcie_dw_link_up(struct dw_pcie *pci) 986 { 987 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 988 u32 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); 989 990 return !!(val & PCI_EXP_LNKSTA_DLLLA); 991 } 992 993 static int tegra_pcie_dw_start_link(struct dw_pcie *pci) 994 { 995 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 996 997 enable_irq(pcie->pex_rst_irq); 998 999 return 0; 1000 } 1001 1002 static void tegra_pcie_dw_stop_link(struct dw_pcie *pci) 1003 { 1004 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 1005 1006 disable_irq(pcie->pex_rst_irq); 1007 } 1008 1009 static const struct dw_pcie_ops tegra_dw_pcie_ops = { 1010 .link_up = tegra_pcie_dw_link_up, 1011 .start_link = tegra_pcie_dw_start_link, 1012 .stop_link = tegra_pcie_dw_stop_link, 1013 }; 1014 1015 static struct dw_pcie_host_ops tegra_pcie_dw_host_ops = { 1016 .host_init = tegra_pcie_dw_host_init, 1017 }; 1018 1019 static void tegra_pcie_disable_phy(struct tegra_pcie_dw *pcie) 1020 { 1021 unsigned int phy_count = pcie->phy_count; 1022 1023 while (phy_count--) { 1024 phy_power_off(pcie->phys[phy_count]); 1025 phy_exit(pcie->phys[phy_count]); 1026 } 1027 } 1028 1029 static int tegra_pcie_enable_phy(struct tegra_pcie_dw *pcie) 1030 { 1031 unsigned int i; 1032 int ret; 1033 1034 for (i = 0; i < pcie->phy_count; i++) { 1035 ret = phy_init(pcie->phys[i]); 1036 if (ret < 0) 1037 goto phy_power_off; 1038 1039 ret = phy_power_on(pcie->phys[i]); 1040 if (ret < 0) 1041 goto phy_exit; 1042 } 1043 1044 return 0; 1045 1046 phy_power_off: 1047 while (i--) { 1048 phy_power_off(pcie->phys[i]); 1049 phy_exit: 1050 phy_exit(pcie->phys[i]); 1051 } 1052 1053 return ret; 1054 } 1055 1056 static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie) 1057 { 1058 struct device_node *np = pcie->dev->of_node; 1059 int ret; 1060 1061 ret = of_property_read_u32(np, "nvidia,aspm-cmrt-us", &pcie->aspm_cmrt); 1062 if (ret < 0) { 1063 dev_info(pcie->dev, "Failed to read ASPM T_cmrt: %d\n", ret); 1064 return ret; 1065 } 1066 1067 ret = of_property_read_u32(np, "nvidia,aspm-pwr-on-t-us", 1068 &pcie->aspm_pwr_on_t); 1069 if (ret < 0) 1070 dev_info(pcie->dev, "Failed to read ASPM Power On time: %d\n", 1071 ret); 1072 1073 ret = of_property_read_u32(np, "nvidia,aspm-l0s-entrance-latency-us", 1074 &pcie->aspm_l0s_enter_lat); 1075 if (ret < 0) 1076 dev_info(pcie->dev, 1077 "Failed to read ASPM L0s Entrance latency: %d\n", ret); 1078 1079 ret = of_property_read_u32(np, "num-lanes", &pcie->num_lanes); 1080 if (ret < 0) { 1081 dev_err(pcie->dev, "Failed to read num-lanes: %d\n", ret); 1082 return ret; 1083 } 1084 1085 ret = of_property_read_u32_index(np, "nvidia,bpmp", 1, &pcie->cid); 1086 if (ret) { 1087 dev_err(pcie->dev, "Failed to read Controller-ID: %d\n", ret); 1088 return ret; 1089 } 1090 1091 ret = of_property_count_strings(np, "phy-names"); 1092 if (ret < 0) { 1093 dev_err(pcie->dev, "Failed to find PHY entries: %d\n", 1094 ret); 1095 return ret; 1096 } 1097 pcie->phy_count = ret; 1098 1099 if (of_property_read_bool(np, "nvidia,update-fc-fixup")) 1100 pcie->update_fc_fixup = true; 1101 1102 pcie->supports_clkreq = 1103 of_property_read_bool(pcie->dev->of_node, "supports-clkreq"); 1104 1105 pcie->enable_cdm_check = 1106 of_property_read_bool(np, "snps,enable-cdm-check"); 1107 1108 if (pcie->mode == DW_PCIE_RC_TYPE) 1109 return 0; 1110 1111 /* Endpoint mode specific DT entries */ 1112 pcie->pex_rst_gpiod = devm_gpiod_get(pcie->dev, "reset", GPIOD_IN); 1113 if (IS_ERR(pcie->pex_rst_gpiod)) { 1114 int err = PTR_ERR(pcie->pex_rst_gpiod); 1115 const char *level = KERN_ERR; 1116 1117 if (err == -EPROBE_DEFER) 1118 level = KERN_DEBUG; 1119 1120 dev_printk(level, pcie->dev, 1121 dev_fmt("Failed to get PERST GPIO: %d\n"), 1122 err); 1123 return err; 1124 } 1125 1126 pcie->pex_refclk_sel_gpiod = devm_gpiod_get(pcie->dev, 1127 "nvidia,refclk-select", 1128 GPIOD_OUT_HIGH); 1129 if (IS_ERR(pcie->pex_refclk_sel_gpiod)) { 1130 int err = PTR_ERR(pcie->pex_refclk_sel_gpiod); 1131 const char *level = KERN_ERR; 1132 1133 if (err == -EPROBE_DEFER) 1134 level = KERN_DEBUG; 1135 1136 dev_printk(level, pcie->dev, 1137 dev_fmt("Failed to get REFCLK select GPIOs: %d\n"), 1138 err); 1139 pcie->pex_refclk_sel_gpiod = NULL; 1140 } 1141 1142 return 0; 1143 } 1144 1145 static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie, 1146 bool enable) 1147 { 1148 struct mrq_uphy_response resp; 1149 struct tegra_bpmp_message msg; 1150 struct mrq_uphy_request req; 1151 1152 /* Controller-5 doesn't need to have its state set by BPMP-FW */ 1153 if (pcie->cid == 5) 1154 return 0; 1155 1156 memset(&req, 0, sizeof(req)); 1157 memset(&resp, 0, sizeof(resp)); 1158 1159 req.cmd = CMD_UPHY_PCIE_CONTROLLER_STATE; 1160 req.controller_state.pcie_controller = pcie->cid; 1161 req.controller_state.enable = enable; 1162 1163 memset(&msg, 0, sizeof(msg)); 1164 msg.mrq = MRQ_UPHY; 1165 msg.tx.data = &req; 1166 msg.tx.size = sizeof(req); 1167 msg.rx.data = &resp; 1168 msg.rx.size = sizeof(resp); 1169 1170 return tegra_bpmp_transfer(pcie->bpmp, &msg); 1171 } 1172 1173 static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie, 1174 bool enable) 1175 { 1176 struct mrq_uphy_response resp; 1177 struct tegra_bpmp_message msg; 1178 struct mrq_uphy_request req; 1179 1180 memset(&req, 0, sizeof(req)); 1181 memset(&resp, 0, sizeof(resp)); 1182 1183 if (enable) { 1184 req.cmd = CMD_UPHY_PCIE_EP_CONTROLLER_PLL_INIT; 1185 req.ep_ctrlr_pll_init.ep_controller = pcie->cid; 1186 } else { 1187 req.cmd = CMD_UPHY_PCIE_EP_CONTROLLER_PLL_OFF; 1188 req.ep_ctrlr_pll_off.ep_controller = pcie->cid; 1189 } 1190 1191 memset(&msg, 0, sizeof(msg)); 1192 msg.mrq = MRQ_UPHY; 1193 msg.tx.data = &req; 1194 msg.tx.size = sizeof(req); 1195 msg.rx.data = &resp; 1196 msg.rx.size = sizeof(resp); 1197 1198 return tegra_bpmp_transfer(pcie->bpmp, &msg); 1199 } 1200 1201 static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie) 1202 { 1203 struct pcie_port *pp = &pcie->pci.pp; 1204 struct pci_bus *child, *root_bus = NULL; 1205 struct pci_dev *pdev; 1206 1207 /* 1208 * link doesn't go into L2 state with some of the endpoints with Tegra 1209 * if they are not in D0 state. So, need to make sure that immediate 1210 * downstream devices are in D0 state before sending PME_TurnOff to put 1211 * link into L2 state. 1212 * This is as per PCI Express Base r4.0 v1.0 September 27-2017, 1213 * 5.2 Link State Power Management (Page #428). 1214 */ 1215 1216 list_for_each_entry(child, &pp->bridge->bus->children, node) { 1217 /* Bring downstream devices to D0 if they are not already in */ 1218 if (child->parent == pp->bridge->bus) { 1219 root_bus = child; 1220 break; 1221 } 1222 } 1223 1224 if (!root_bus) { 1225 dev_err(pcie->dev, "Failed to find downstream devices\n"); 1226 return; 1227 } 1228 1229 list_for_each_entry(pdev, &root_bus->devices, bus_list) { 1230 if (PCI_SLOT(pdev->devfn) == 0) { 1231 if (pci_set_power_state(pdev, PCI_D0)) 1232 dev_err(pcie->dev, 1233 "Failed to transition %s to D0 state\n", 1234 dev_name(&pdev->dev)); 1235 } 1236 } 1237 } 1238 1239 static int tegra_pcie_get_slot_regulators(struct tegra_pcie_dw *pcie) 1240 { 1241 pcie->slot_ctl_3v3 = devm_regulator_get_optional(pcie->dev, "vpcie3v3"); 1242 if (IS_ERR(pcie->slot_ctl_3v3)) { 1243 if (PTR_ERR(pcie->slot_ctl_3v3) != -ENODEV) 1244 return PTR_ERR(pcie->slot_ctl_3v3); 1245 1246 pcie->slot_ctl_3v3 = NULL; 1247 } 1248 1249 pcie->slot_ctl_12v = devm_regulator_get_optional(pcie->dev, "vpcie12v"); 1250 if (IS_ERR(pcie->slot_ctl_12v)) { 1251 if (PTR_ERR(pcie->slot_ctl_12v) != -ENODEV) 1252 return PTR_ERR(pcie->slot_ctl_12v); 1253 1254 pcie->slot_ctl_12v = NULL; 1255 } 1256 1257 return 0; 1258 } 1259 1260 static int tegra_pcie_enable_slot_regulators(struct tegra_pcie_dw *pcie) 1261 { 1262 int ret; 1263 1264 if (pcie->slot_ctl_3v3) { 1265 ret = regulator_enable(pcie->slot_ctl_3v3); 1266 if (ret < 0) { 1267 dev_err(pcie->dev, 1268 "Failed to enable 3.3V slot supply: %d\n", ret); 1269 return ret; 1270 } 1271 } 1272 1273 if (pcie->slot_ctl_12v) { 1274 ret = regulator_enable(pcie->slot_ctl_12v); 1275 if (ret < 0) { 1276 dev_err(pcie->dev, 1277 "Failed to enable 12V slot supply: %d\n", ret); 1278 goto fail_12v_enable; 1279 } 1280 } 1281 1282 /* 1283 * According to PCI Express Card Electromechanical Specification 1284 * Revision 1.1, Table-2.4, T_PVPERL (Power stable to PERST# inactive) 1285 * should be a minimum of 100ms. 1286 */ 1287 if (pcie->slot_ctl_3v3 || pcie->slot_ctl_12v) 1288 msleep(100); 1289 1290 return 0; 1291 1292 fail_12v_enable: 1293 if (pcie->slot_ctl_3v3) 1294 regulator_disable(pcie->slot_ctl_3v3); 1295 return ret; 1296 } 1297 1298 static void tegra_pcie_disable_slot_regulators(struct tegra_pcie_dw *pcie) 1299 { 1300 if (pcie->slot_ctl_12v) 1301 regulator_disable(pcie->slot_ctl_12v); 1302 if (pcie->slot_ctl_3v3) 1303 regulator_disable(pcie->slot_ctl_3v3); 1304 } 1305 1306 static int tegra_pcie_config_controller(struct tegra_pcie_dw *pcie, 1307 bool en_hw_hot_rst) 1308 { 1309 int ret; 1310 u32 val; 1311 1312 ret = tegra_pcie_bpmp_set_ctrl_state(pcie, true); 1313 if (ret) { 1314 dev_err(pcie->dev, 1315 "Failed to enable controller %u: %d\n", pcie->cid, ret); 1316 return ret; 1317 } 1318 1319 ret = tegra_pcie_enable_slot_regulators(pcie); 1320 if (ret < 0) 1321 goto fail_slot_reg_en; 1322 1323 ret = regulator_enable(pcie->pex_ctl_supply); 1324 if (ret < 0) { 1325 dev_err(pcie->dev, "Failed to enable regulator: %d\n", ret); 1326 goto fail_reg_en; 1327 } 1328 1329 ret = clk_prepare_enable(pcie->core_clk); 1330 if (ret) { 1331 dev_err(pcie->dev, "Failed to enable core clock: %d\n", ret); 1332 goto fail_core_clk; 1333 } 1334 1335 ret = reset_control_deassert(pcie->core_apb_rst); 1336 if (ret) { 1337 dev_err(pcie->dev, "Failed to deassert core APB reset: %d\n", 1338 ret); 1339 goto fail_core_apb_rst; 1340 } 1341 1342 if (en_hw_hot_rst) { 1343 /* Enable HW_HOT_RST mode */ 1344 val = appl_readl(pcie, APPL_CTRL); 1345 val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << 1346 APPL_CTRL_HW_HOT_RST_MODE_SHIFT); 1347 val |= APPL_CTRL_HW_HOT_RST_EN; 1348 appl_writel(pcie, val, APPL_CTRL); 1349 } 1350 1351 ret = tegra_pcie_enable_phy(pcie); 1352 if (ret) { 1353 dev_err(pcie->dev, "Failed to enable PHY: %d\n", ret); 1354 goto fail_phy; 1355 } 1356 1357 /* Update CFG base address */ 1358 appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK, 1359 APPL_CFG_BASE_ADDR); 1360 1361 /* Configure this core for RP mode operation */ 1362 appl_writel(pcie, APPL_DM_TYPE_RP, APPL_DM_TYPE); 1363 1364 appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE); 1365 1366 val = appl_readl(pcie, APPL_CTRL); 1367 appl_writel(pcie, val | APPL_CTRL_SYS_PRE_DET_STATE, APPL_CTRL); 1368 1369 val = appl_readl(pcie, APPL_CFG_MISC); 1370 val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT); 1371 appl_writel(pcie, val, APPL_CFG_MISC); 1372 1373 if (!pcie->supports_clkreq) { 1374 val = appl_readl(pcie, APPL_PINMUX); 1375 val |= APPL_PINMUX_CLKREQ_OVERRIDE_EN; 1376 val &= ~APPL_PINMUX_CLKREQ_OVERRIDE; 1377 appl_writel(pcie, val, APPL_PINMUX); 1378 } 1379 1380 /* Update iATU_DMA base address */ 1381 appl_writel(pcie, 1382 pcie->atu_dma_res->start & APPL_CFG_IATU_DMA_BASE_ADDR_MASK, 1383 APPL_CFG_IATU_DMA_BASE_ADDR); 1384 1385 reset_control_deassert(pcie->core_rst); 1386 1387 pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci, 1388 PCI_CAP_ID_EXP); 1389 1390 /* Disable ASPM-L1SS advertisement as there is no CLKREQ routing */ 1391 if (!pcie->supports_clkreq) { 1392 disable_aspm_l11(pcie); 1393 disable_aspm_l12(pcie); 1394 } 1395 1396 return ret; 1397 1398 fail_phy: 1399 reset_control_assert(pcie->core_apb_rst); 1400 fail_core_apb_rst: 1401 clk_disable_unprepare(pcie->core_clk); 1402 fail_core_clk: 1403 regulator_disable(pcie->pex_ctl_supply); 1404 fail_reg_en: 1405 tegra_pcie_disable_slot_regulators(pcie); 1406 fail_slot_reg_en: 1407 tegra_pcie_bpmp_set_ctrl_state(pcie, false); 1408 1409 return ret; 1410 } 1411 1412 static int __deinit_controller(struct tegra_pcie_dw *pcie) 1413 { 1414 int ret; 1415 1416 ret = reset_control_assert(pcie->core_rst); 1417 if (ret) { 1418 dev_err(pcie->dev, "Failed to assert \"core\" reset: %d\n", 1419 ret); 1420 return ret; 1421 } 1422 1423 tegra_pcie_disable_phy(pcie); 1424 1425 ret = reset_control_assert(pcie->core_apb_rst); 1426 if (ret) { 1427 dev_err(pcie->dev, "Failed to assert APB reset: %d\n", ret); 1428 return ret; 1429 } 1430 1431 clk_disable_unprepare(pcie->core_clk); 1432 1433 ret = regulator_disable(pcie->pex_ctl_supply); 1434 if (ret) { 1435 dev_err(pcie->dev, "Failed to disable regulator: %d\n", ret); 1436 return ret; 1437 } 1438 1439 tegra_pcie_disable_slot_regulators(pcie); 1440 1441 ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false); 1442 if (ret) { 1443 dev_err(pcie->dev, "Failed to disable controller %d: %d\n", 1444 pcie->cid, ret); 1445 return ret; 1446 } 1447 1448 return ret; 1449 } 1450 1451 static int tegra_pcie_init_controller(struct tegra_pcie_dw *pcie) 1452 { 1453 struct dw_pcie *pci = &pcie->pci; 1454 struct pcie_port *pp = &pci->pp; 1455 int ret; 1456 1457 ret = tegra_pcie_config_controller(pcie, false); 1458 if (ret < 0) 1459 return ret; 1460 1461 pp->ops = &tegra_pcie_dw_host_ops; 1462 1463 ret = dw_pcie_host_init(pp); 1464 if (ret < 0) { 1465 dev_err(pcie->dev, "Failed to add PCIe port: %d\n", ret); 1466 goto fail_host_init; 1467 } 1468 1469 return 0; 1470 1471 fail_host_init: 1472 return __deinit_controller(pcie); 1473 } 1474 1475 static int tegra_pcie_try_link_l2(struct tegra_pcie_dw *pcie) 1476 { 1477 u32 val; 1478 1479 if (!tegra_pcie_dw_link_up(&pcie->pci)) 1480 return 0; 1481 1482 val = appl_readl(pcie, APPL_RADM_STATUS); 1483 val |= APPL_PM_XMT_TURNOFF_STATE; 1484 appl_writel(pcie, val, APPL_RADM_STATUS); 1485 1486 return readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, val, 1487 val & APPL_DEBUG_PM_LINKST_IN_L2_LAT, 1488 1, PME_ACK_TIMEOUT); 1489 } 1490 1491 static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie) 1492 { 1493 u32 data; 1494 int err; 1495 1496 if (!tegra_pcie_dw_link_up(&pcie->pci)) { 1497 dev_dbg(pcie->dev, "PCIe link is not up...!\n"); 1498 return; 1499 } 1500 1501 if (tegra_pcie_try_link_l2(pcie)) { 1502 dev_info(pcie->dev, "Link didn't transition to L2 state\n"); 1503 /* 1504 * TX lane clock freq will reset to Gen1 only if link is in L2 1505 * or detect state. 1506 * So apply pex_rst to end point to force RP to go into detect 1507 * state 1508 */ 1509 data = appl_readl(pcie, APPL_PINMUX); 1510 data &= ~APPL_PINMUX_PEX_RST; 1511 appl_writel(pcie, data, APPL_PINMUX); 1512 1513 err = readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, 1514 data, 1515 ((data & 1516 APPL_DEBUG_LTSSM_STATE_MASK) >> 1517 APPL_DEBUG_LTSSM_STATE_SHIFT) == 1518 LTSSM_STATE_PRE_DETECT, 1519 1, LTSSM_TIMEOUT); 1520 if (err) { 1521 dev_info(pcie->dev, "Link didn't go to detect state\n"); 1522 } else { 1523 /* Disable LTSSM after link is in detect state */ 1524 data = appl_readl(pcie, APPL_CTRL); 1525 data &= ~APPL_CTRL_LTSSM_EN; 1526 appl_writel(pcie, data, APPL_CTRL); 1527 } 1528 } 1529 /* 1530 * DBI registers may not be accessible after this as PLL-E would be 1531 * down depending on how CLKREQ is pulled by end point 1532 */ 1533 data = appl_readl(pcie, APPL_PINMUX); 1534 data |= (APPL_PINMUX_CLKREQ_OVERRIDE_EN | APPL_PINMUX_CLKREQ_OVERRIDE); 1535 /* Cut REFCLK to slot */ 1536 data |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN; 1537 data &= ~APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE; 1538 appl_writel(pcie, data, APPL_PINMUX); 1539 } 1540 1541 static int tegra_pcie_deinit_controller(struct tegra_pcie_dw *pcie) 1542 { 1543 tegra_pcie_downstream_dev_to_D0(pcie); 1544 dw_pcie_host_deinit(&pcie->pci.pp); 1545 tegra_pcie_dw_pme_turnoff(pcie); 1546 1547 return __deinit_controller(pcie); 1548 } 1549 1550 static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie) 1551 { 1552 struct device *dev = pcie->dev; 1553 char *name; 1554 int ret; 1555 1556 pm_runtime_enable(dev); 1557 1558 ret = pm_runtime_get_sync(dev); 1559 if (ret < 0) { 1560 dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", 1561 ret); 1562 goto fail_pm_get_sync; 1563 } 1564 1565 ret = pinctrl_pm_select_default_state(dev); 1566 if (ret < 0) { 1567 dev_err(dev, "Failed to configure sideband pins: %d\n", ret); 1568 goto fail_pm_get_sync; 1569 } 1570 1571 tegra_pcie_init_controller(pcie); 1572 1573 pcie->link_state = tegra_pcie_dw_link_up(&pcie->pci); 1574 if (!pcie->link_state) { 1575 ret = -ENOMEDIUM; 1576 goto fail_host_init; 1577 } 1578 1579 name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node); 1580 if (!name) { 1581 ret = -ENOMEM; 1582 goto fail_host_init; 1583 } 1584 1585 pcie->debugfs = debugfs_create_dir(name, NULL); 1586 init_debugfs(pcie); 1587 1588 return ret; 1589 1590 fail_host_init: 1591 tegra_pcie_deinit_controller(pcie); 1592 fail_pm_get_sync: 1593 pm_runtime_put_sync(dev); 1594 pm_runtime_disable(dev); 1595 return ret; 1596 } 1597 1598 static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie) 1599 { 1600 u32 val; 1601 int ret; 1602 1603 if (pcie->ep_state == EP_STATE_DISABLED) 1604 return; 1605 1606 /* Disable LTSSM */ 1607 val = appl_readl(pcie, APPL_CTRL); 1608 val &= ~APPL_CTRL_LTSSM_EN; 1609 appl_writel(pcie, val, APPL_CTRL); 1610 1611 ret = readl_poll_timeout(pcie->appl_base + APPL_DEBUG, val, 1612 ((val & APPL_DEBUG_LTSSM_STATE_MASK) >> 1613 APPL_DEBUG_LTSSM_STATE_SHIFT) == 1614 LTSSM_STATE_PRE_DETECT, 1615 1, LTSSM_TIMEOUT); 1616 if (ret) 1617 dev_err(pcie->dev, "Failed to go Detect state: %d\n", ret); 1618 1619 reset_control_assert(pcie->core_rst); 1620 1621 tegra_pcie_disable_phy(pcie); 1622 1623 reset_control_assert(pcie->core_apb_rst); 1624 1625 clk_disable_unprepare(pcie->core_clk); 1626 1627 pm_runtime_put_sync(pcie->dev); 1628 1629 ret = tegra_pcie_bpmp_set_pll_state(pcie, false); 1630 if (ret) 1631 dev_err(pcie->dev, "Failed to turn off UPHY: %d\n", ret); 1632 1633 pcie->ep_state = EP_STATE_DISABLED; 1634 dev_dbg(pcie->dev, "Uninitialization of endpoint is completed\n"); 1635 } 1636 1637 static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) 1638 { 1639 struct dw_pcie *pci = &pcie->pci; 1640 struct dw_pcie_ep *ep = &pci->ep; 1641 struct device *dev = pcie->dev; 1642 u32 val; 1643 int ret; 1644 1645 if (pcie->ep_state == EP_STATE_ENABLED) 1646 return; 1647 1648 ret = pm_runtime_get_sync(dev); 1649 if (ret < 0) { 1650 dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", 1651 ret); 1652 return; 1653 } 1654 1655 ret = tegra_pcie_bpmp_set_pll_state(pcie, true); 1656 if (ret) { 1657 dev_err(dev, "Failed to init UPHY for PCIe EP: %d\n", ret); 1658 goto fail_pll_init; 1659 } 1660 1661 ret = clk_prepare_enable(pcie->core_clk); 1662 if (ret) { 1663 dev_err(dev, "Failed to enable core clock: %d\n", ret); 1664 goto fail_core_clk_enable; 1665 } 1666 1667 ret = reset_control_deassert(pcie->core_apb_rst); 1668 if (ret) { 1669 dev_err(dev, "Failed to deassert core APB reset: %d\n", ret); 1670 goto fail_core_apb_rst; 1671 } 1672 1673 ret = tegra_pcie_enable_phy(pcie); 1674 if (ret) { 1675 dev_err(dev, "Failed to enable PHY: %d\n", ret); 1676 goto fail_phy; 1677 } 1678 1679 /* Clear any stale interrupt statuses */ 1680 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0); 1681 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0); 1682 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1); 1683 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2); 1684 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3); 1685 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6); 1686 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7); 1687 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0); 1688 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9); 1689 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10); 1690 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11); 1691 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13); 1692 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14); 1693 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15); 1694 appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17); 1695 1696 /* configure this core for EP mode operation */ 1697 val = appl_readl(pcie, APPL_DM_TYPE); 1698 val &= ~APPL_DM_TYPE_MASK; 1699 val |= APPL_DM_TYPE_EP; 1700 appl_writel(pcie, val, APPL_DM_TYPE); 1701 1702 appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE); 1703 1704 val = appl_readl(pcie, APPL_CTRL); 1705 val |= APPL_CTRL_SYS_PRE_DET_STATE; 1706 val |= APPL_CTRL_HW_HOT_RST_EN; 1707 appl_writel(pcie, val, APPL_CTRL); 1708 1709 val = appl_readl(pcie, APPL_CFG_MISC); 1710 val |= APPL_CFG_MISC_SLV_EP_MODE; 1711 val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT); 1712 appl_writel(pcie, val, APPL_CFG_MISC); 1713 1714 val = appl_readl(pcie, APPL_PINMUX); 1715 val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN; 1716 val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE; 1717 appl_writel(pcie, val, APPL_PINMUX); 1718 1719 appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK, 1720 APPL_CFG_BASE_ADDR); 1721 1722 appl_writel(pcie, pcie->atu_dma_res->start & 1723 APPL_CFG_IATU_DMA_BASE_ADDR_MASK, 1724 APPL_CFG_IATU_DMA_BASE_ADDR); 1725 1726 val = appl_readl(pcie, APPL_INTR_EN_L0_0); 1727 val |= APPL_INTR_EN_L0_0_SYS_INTR_EN; 1728 val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN; 1729 val |= APPL_INTR_EN_L0_0_PCI_CMD_EN_INT_EN; 1730 appl_writel(pcie, val, APPL_INTR_EN_L0_0); 1731 1732 val = appl_readl(pcie, APPL_INTR_EN_L1_0_0); 1733 val |= APPL_INTR_EN_L1_0_0_HOT_RESET_DONE_INT_EN; 1734 val |= APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN; 1735 appl_writel(pcie, val, APPL_INTR_EN_L1_0_0); 1736 1737 reset_control_deassert(pcie->core_rst); 1738 1739 if (pcie->update_fc_fixup) { 1740 val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF); 1741 val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT; 1742 dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF, val); 1743 } 1744 1745 config_gen3_gen4_eq_presets(pcie); 1746 1747 init_host_aspm(pcie); 1748 1749 /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */ 1750 if (!pcie->supports_clkreq) { 1751 disable_aspm_l11(pcie); 1752 disable_aspm_l12(pcie); 1753 } 1754 1755 val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); 1756 val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; 1757 dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); 1758 1759 pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci, 1760 PCI_CAP_ID_EXP); 1761 clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ); 1762 1763 val = (ep->msi_mem_phys & MSIX_ADDR_MATCH_LOW_OFF_MASK); 1764 val |= MSIX_ADDR_MATCH_LOW_OFF_EN; 1765 dw_pcie_writel_dbi(pci, MSIX_ADDR_MATCH_LOW_OFF, val); 1766 val = (lower_32_bits(ep->msi_mem_phys) & MSIX_ADDR_MATCH_HIGH_OFF_MASK); 1767 dw_pcie_writel_dbi(pci, MSIX_ADDR_MATCH_HIGH_OFF, val); 1768 1769 ret = dw_pcie_ep_init_complete(ep); 1770 if (ret) { 1771 dev_err(dev, "Failed to complete initialization: %d\n", ret); 1772 goto fail_init_complete; 1773 } 1774 1775 dw_pcie_ep_init_notify(ep); 1776 1777 /* Enable LTSSM */ 1778 val = appl_readl(pcie, APPL_CTRL); 1779 val |= APPL_CTRL_LTSSM_EN; 1780 appl_writel(pcie, val, APPL_CTRL); 1781 1782 pcie->ep_state = EP_STATE_ENABLED; 1783 dev_dbg(dev, "Initialization of endpoint is completed\n"); 1784 1785 return; 1786 1787 fail_init_complete: 1788 reset_control_assert(pcie->core_rst); 1789 tegra_pcie_disable_phy(pcie); 1790 fail_phy: 1791 reset_control_assert(pcie->core_apb_rst); 1792 fail_core_apb_rst: 1793 clk_disable_unprepare(pcie->core_clk); 1794 fail_core_clk_enable: 1795 tegra_pcie_bpmp_set_pll_state(pcie, false); 1796 fail_pll_init: 1797 pm_runtime_put_sync(dev); 1798 } 1799 1800 static irqreturn_t tegra_pcie_ep_pex_rst_irq(int irq, void *arg) 1801 { 1802 struct tegra_pcie_dw *pcie = arg; 1803 1804 if (gpiod_get_value(pcie->pex_rst_gpiod)) 1805 pex_ep_event_pex_rst_assert(pcie); 1806 else 1807 pex_ep_event_pex_rst_deassert(pcie); 1808 1809 return IRQ_HANDLED; 1810 } 1811 1812 static int tegra_pcie_ep_raise_legacy_irq(struct tegra_pcie_dw *pcie, u16 irq) 1813 { 1814 /* Tegra194 supports only INTA */ 1815 if (irq > 1) 1816 return -EINVAL; 1817 1818 appl_writel(pcie, 1, APPL_LEGACY_INTX); 1819 usleep_range(1000, 2000); 1820 appl_writel(pcie, 0, APPL_LEGACY_INTX); 1821 return 0; 1822 } 1823 1824 static int tegra_pcie_ep_raise_msi_irq(struct tegra_pcie_dw *pcie, u16 irq) 1825 { 1826 if (unlikely(irq > 31)) 1827 return -EINVAL; 1828 1829 appl_writel(pcie, (1 << irq), APPL_MSI_CTRL_1); 1830 1831 return 0; 1832 } 1833 1834 static int tegra_pcie_ep_raise_msix_irq(struct tegra_pcie_dw *pcie, u16 irq) 1835 { 1836 struct dw_pcie_ep *ep = &pcie->pci.ep; 1837 1838 writel(irq, ep->msi_mem); 1839 1840 return 0; 1841 } 1842 1843 static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, 1844 enum pci_epc_irq_type type, 1845 u16 interrupt_num) 1846 { 1847 struct dw_pcie *pci = to_dw_pcie_from_ep(ep); 1848 struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); 1849 1850 switch (type) { 1851 case PCI_EPC_IRQ_LEGACY: 1852 return tegra_pcie_ep_raise_legacy_irq(pcie, interrupt_num); 1853 1854 case PCI_EPC_IRQ_MSI: 1855 return tegra_pcie_ep_raise_msi_irq(pcie, interrupt_num); 1856 1857 case PCI_EPC_IRQ_MSIX: 1858 return tegra_pcie_ep_raise_msix_irq(pcie, interrupt_num); 1859 1860 default: 1861 dev_err(pci->dev, "Unknown IRQ type\n"); 1862 return -EPERM; 1863 } 1864 1865 return 0; 1866 } 1867 1868 static const struct pci_epc_features tegra_pcie_epc_features = { 1869 .linkup_notifier = true, 1870 .core_init_notifier = true, 1871 .msi_capable = false, 1872 .msix_capable = false, 1873 .reserved_bar = 1 << BAR_2 | 1 << BAR_3 | 1 << BAR_4 | 1 << BAR_5, 1874 .bar_fixed_64bit = 1 << BAR_0, 1875 .bar_fixed_size[0] = SZ_1M, 1876 }; 1877 1878 static const struct pci_epc_features* 1879 tegra_pcie_ep_get_features(struct dw_pcie_ep *ep) 1880 { 1881 return &tegra_pcie_epc_features; 1882 } 1883 1884 static struct dw_pcie_ep_ops pcie_ep_ops = { 1885 .raise_irq = tegra_pcie_ep_raise_irq, 1886 .get_features = tegra_pcie_ep_get_features, 1887 }; 1888 1889 static int tegra_pcie_config_ep(struct tegra_pcie_dw *pcie, 1890 struct platform_device *pdev) 1891 { 1892 struct dw_pcie *pci = &pcie->pci; 1893 struct device *dev = pcie->dev; 1894 struct dw_pcie_ep *ep; 1895 char *name; 1896 int ret; 1897 1898 ep = &pci->ep; 1899 ep->ops = &pcie_ep_ops; 1900 1901 ep->page_size = SZ_64K; 1902 1903 ret = gpiod_set_debounce(pcie->pex_rst_gpiod, PERST_DEBOUNCE_TIME); 1904 if (ret < 0) { 1905 dev_err(dev, "Failed to set PERST GPIO debounce time: %d\n", 1906 ret); 1907 return ret; 1908 } 1909 1910 ret = gpiod_to_irq(pcie->pex_rst_gpiod); 1911 if (ret < 0) { 1912 dev_err(dev, "Failed to get IRQ for PERST GPIO: %d\n", ret); 1913 return ret; 1914 } 1915 pcie->pex_rst_irq = (unsigned int)ret; 1916 1917 name = devm_kasprintf(dev, GFP_KERNEL, "tegra_pcie_%u_pex_rst_irq", 1918 pcie->cid); 1919 if (!name) { 1920 dev_err(dev, "Failed to create PERST IRQ string\n"); 1921 return -ENOMEM; 1922 } 1923 1924 irq_set_status_flags(pcie->pex_rst_irq, IRQ_NOAUTOEN); 1925 1926 pcie->ep_state = EP_STATE_DISABLED; 1927 1928 ret = devm_request_threaded_irq(dev, pcie->pex_rst_irq, NULL, 1929 tegra_pcie_ep_pex_rst_irq, 1930 IRQF_TRIGGER_RISING | 1931 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 1932 name, (void *)pcie); 1933 if (ret < 0) { 1934 dev_err(dev, "Failed to request IRQ for PERST: %d\n", ret); 1935 return ret; 1936 } 1937 1938 name = devm_kasprintf(dev, GFP_KERNEL, "tegra_pcie_%u_ep_work", 1939 pcie->cid); 1940 if (!name) { 1941 dev_err(dev, "Failed to create PCIe EP work thread string\n"); 1942 return -ENOMEM; 1943 } 1944 1945 pm_runtime_enable(dev); 1946 1947 ret = dw_pcie_ep_init(ep); 1948 if (ret) { 1949 dev_err(dev, "Failed to initialize DWC Endpoint subsystem: %d\n", 1950 ret); 1951 return ret; 1952 } 1953 1954 return 0; 1955 } 1956 1957 static int tegra_pcie_dw_probe(struct platform_device *pdev) 1958 { 1959 const struct tegra_pcie_dw_of_data *data; 1960 struct device *dev = &pdev->dev; 1961 struct resource *atu_dma_res; 1962 struct tegra_pcie_dw *pcie; 1963 struct pcie_port *pp; 1964 struct dw_pcie *pci; 1965 struct phy **phys; 1966 char *name; 1967 int ret; 1968 u32 i; 1969 1970 data = of_device_get_match_data(dev); 1971 1972 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); 1973 if (!pcie) 1974 return -ENOMEM; 1975 1976 pci = &pcie->pci; 1977 pci->dev = &pdev->dev; 1978 pci->ops = &tegra_dw_pcie_ops; 1979 pci->n_fts[0] = N_FTS_VAL; 1980 pci->n_fts[1] = FTS_VAL; 1981 1982 pp = &pci->pp; 1983 pp->num_vectors = MAX_MSI_IRQS; 1984 pcie->dev = &pdev->dev; 1985 pcie->mode = (enum dw_pcie_device_mode)data->mode; 1986 1987 ret = tegra_pcie_dw_parse_dt(pcie); 1988 if (ret < 0) { 1989 const char *level = KERN_ERR; 1990 1991 if (ret == -EPROBE_DEFER) 1992 level = KERN_DEBUG; 1993 1994 dev_printk(level, dev, 1995 dev_fmt("Failed to parse device tree: %d\n"), 1996 ret); 1997 return ret; 1998 } 1999 2000 ret = tegra_pcie_get_slot_regulators(pcie); 2001 if (ret < 0) { 2002 const char *level = KERN_ERR; 2003 2004 if (ret == -EPROBE_DEFER) 2005 level = KERN_DEBUG; 2006 2007 dev_printk(level, dev, 2008 dev_fmt("Failed to get slot regulators: %d\n"), 2009 ret); 2010 return ret; 2011 } 2012 2013 if (pcie->pex_refclk_sel_gpiod) 2014 gpiod_set_value(pcie->pex_refclk_sel_gpiod, 1); 2015 2016 pcie->pex_ctl_supply = devm_regulator_get(dev, "vddio-pex-ctl"); 2017 if (IS_ERR(pcie->pex_ctl_supply)) { 2018 ret = PTR_ERR(pcie->pex_ctl_supply); 2019 if (ret != -EPROBE_DEFER) 2020 dev_err(dev, "Failed to get regulator: %ld\n", 2021 PTR_ERR(pcie->pex_ctl_supply)); 2022 return ret; 2023 } 2024 2025 pcie->core_clk = devm_clk_get(dev, "core"); 2026 if (IS_ERR(pcie->core_clk)) { 2027 dev_err(dev, "Failed to get core clock: %ld\n", 2028 PTR_ERR(pcie->core_clk)); 2029 return PTR_ERR(pcie->core_clk); 2030 } 2031 2032 pcie->appl_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 2033 "appl"); 2034 if (!pcie->appl_res) { 2035 dev_err(dev, "Failed to find \"appl\" region\n"); 2036 return -ENODEV; 2037 } 2038 2039 pcie->appl_base = devm_ioremap_resource(dev, pcie->appl_res); 2040 if (IS_ERR(pcie->appl_base)) 2041 return PTR_ERR(pcie->appl_base); 2042 2043 pcie->core_apb_rst = devm_reset_control_get(dev, "apb"); 2044 if (IS_ERR(pcie->core_apb_rst)) { 2045 dev_err(dev, "Failed to get APB reset: %ld\n", 2046 PTR_ERR(pcie->core_apb_rst)); 2047 return PTR_ERR(pcie->core_apb_rst); 2048 } 2049 2050 phys = devm_kcalloc(dev, pcie->phy_count, sizeof(*phys), GFP_KERNEL); 2051 if (!phys) 2052 return -ENOMEM; 2053 2054 for (i = 0; i < pcie->phy_count; i++) { 2055 name = kasprintf(GFP_KERNEL, "p2u-%u", i); 2056 if (!name) { 2057 dev_err(dev, "Failed to create P2U string\n"); 2058 return -ENOMEM; 2059 } 2060 phys[i] = devm_phy_get(dev, name); 2061 kfree(name); 2062 if (IS_ERR(phys[i])) { 2063 ret = PTR_ERR(phys[i]); 2064 if (ret != -EPROBE_DEFER) 2065 dev_err(dev, "Failed to get PHY: %d\n", ret); 2066 return ret; 2067 } 2068 } 2069 2070 pcie->phys = phys; 2071 2072 atu_dma_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, 2073 "atu_dma"); 2074 if (!atu_dma_res) { 2075 dev_err(dev, "Failed to find \"atu_dma\" region\n"); 2076 return -ENODEV; 2077 } 2078 pcie->atu_dma_res = atu_dma_res; 2079 2080 pci->atu_base = devm_ioremap_resource(dev, atu_dma_res); 2081 if (IS_ERR(pci->atu_base)) 2082 return PTR_ERR(pci->atu_base); 2083 2084 pcie->core_rst = devm_reset_control_get(dev, "core"); 2085 if (IS_ERR(pcie->core_rst)) { 2086 dev_err(dev, "Failed to get core reset: %ld\n", 2087 PTR_ERR(pcie->core_rst)); 2088 return PTR_ERR(pcie->core_rst); 2089 } 2090 2091 pp->irq = platform_get_irq_byname(pdev, "intr"); 2092 if (pp->irq < 0) 2093 return pp->irq; 2094 2095 pcie->bpmp = tegra_bpmp_get(dev); 2096 if (IS_ERR(pcie->bpmp)) 2097 return PTR_ERR(pcie->bpmp); 2098 2099 platform_set_drvdata(pdev, pcie); 2100 2101 switch (pcie->mode) { 2102 case DW_PCIE_RC_TYPE: 2103 ret = devm_request_irq(dev, pp->irq, tegra_pcie_rp_irq_handler, 2104 IRQF_SHARED, "tegra-pcie-intr", pcie); 2105 if (ret) { 2106 dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq, 2107 ret); 2108 goto fail; 2109 } 2110 2111 ret = tegra_pcie_config_rp(pcie); 2112 if (ret && ret != -ENOMEDIUM) 2113 goto fail; 2114 else 2115 return 0; 2116 break; 2117 2118 case DW_PCIE_EP_TYPE: 2119 ret = devm_request_threaded_irq(dev, pp->irq, 2120 tegra_pcie_ep_hard_irq, 2121 tegra_pcie_ep_irq_thread, 2122 IRQF_SHARED | IRQF_ONESHOT, 2123 "tegra-pcie-ep-intr", pcie); 2124 if (ret) { 2125 dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq, 2126 ret); 2127 goto fail; 2128 } 2129 2130 ret = tegra_pcie_config_ep(pcie, pdev); 2131 if (ret < 0) 2132 goto fail; 2133 break; 2134 2135 default: 2136 dev_err(dev, "Invalid PCIe device type %d\n", pcie->mode); 2137 } 2138 2139 fail: 2140 tegra_bpmp_put(pcie->bpmp); 2141 return ret; 2142 } 2143 2144 static int tegra_pcie_dw_remove(struct platform_device *pdev) 2145 { 2146 struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev); 2147 2148 if (!pcie->link_state) 2149 return 0; 2150 2151 debugfs_remove_recursive(pcie->debugfs); 2152 tegra_pcie_deinit_controller(pcie); 2153 pm_runtime_put_sync(pcie->dev); 2154 pm_runtime_disable(pcie->dev); 2155 tegra_bpmp_put(pcie->bpmp); 2156 if (pcie->pex_refclk_sel_gpiod) 2157 gpiod_set_value(pcie->pex_refclk_sel_gpiod, 0); 2158 2159 return 0; 2160 } 2161 2162 static int tegra_pcie_dw_suspend_late(struct device *dev) 2163 { 2164 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); 2165 u32 val; 2166 2167 if (!pcie->link_state) 2168 return 0; 2169 2170 /* Enable HW_HOT_RST mode */ 2171 val = appl_readl(pcie, APPL_CTRL); 2172 val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << 2173 APPL_CTRL_HW_HOT_RST_MODE_SHIFT); 2174 val |= APPL_CTRL_HW_HOT_RST_EN; 2175 appl_writel(pcie, val, APPL_CTRL); 2176 2177 return 0; 2178 } 2179 2180 static int tegra_pcie_dw_suspend_noirq(struct device *dev) 2181 { 2182 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); 2183 2184 if (!pcie->link_state) 2185 return 0; 2186 2187 /* Save MSI interrupt vector */ 2188 pcie->msi_ctrl_int = dw_pcie_readl_dbi(&pcie->pci, 2189 PORT_LOGIC_MSI_CTRL_INT_0_EN); 2190 tegra_pcie_downstream_dev_to_D0(pcie); 2191 tegra_pcie_dw_pme_turnoff(pcie); 2192 2193 return __deinit_controller(pcie); 2194 } 2195 2196 static int tegra_pcie_dw_resume_noirq(struct device *dev) 2197 { 2198 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); 2199 int ret; 2200 2201 if (!pcie->link_state) 2202 return 0; 2203 2204 ret = tegra_pcie_config_controller(pcie, true); 2205 if (ret < 0) 2206 return ret; 2207 2208 ret = tegra_pcie_dw_host_init(&pcie->pci.pp); 2209 if (ret < 0) { 2210 dev_err(dev, "Failed to init host: %d\n", ret); 2211 goto fail_host_init; 2212 } 2213 2214 /* Restore MSI interrupt vector */ 2215 dw_pcie_writel_dbi(&pcie->pci, PORT_LOGIC_MSI_CTRL_INT_0_EN, 2216 pcie->msi_ctrl_int); 2217 2218 return 0; 2219 2220 fail_host_init: 2221 return __deinit_controller(pcie); 2222 } 2223 2224 static int tegra_pcie_dw_resume_early(struct device *dev) 2225 { 2226 struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); 2227 u32 val; 2228 2229 if (!pcie->link_state) 2230 return 0; 2231 2232 /* Disable HW_HOT_RST mode */ 2233 val = appl_readl(pcie, APPL_CTRL); 2234 val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << 2235 APPL_CTRL_HW_HOT_RST_MODE_SHIFT); 2236 val |= APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST << 2237 APPL_CTRL_HW_HOT_RST_MODE_SHIFT; 2238 val &= ~APPL_CTRL_HW_HOT_RST_EN; 2239 appl_writel(pcie, val, APPL_CTRL); 2240 2241 return 0; 2242 } 2243 2244 static void tegra_pcie_dw_shutdown(struct platform_device *pdev) 2245 { 2246 struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev); 2247 2248 if (!pcie->link_state) 2249 return; 2250 2251 debugfs_remove_recursive(pcie->debugfs); 2252 tegra_pcie_downstream_dev_to_D0(pcie); 2253 2254 disable_irq(pcie->pci.pp.irq); 2255 if (IS_ENABLED(CONFIG_PCI_MSI)) 2256 disable_irq(pcie->pci.pp.msi_irq); 2257 2258 tegra_pcie_dw_pme_turnoff(pcie); 2259 __deinit_controller(pcie); 2260 } 2261 2262 static const struct tegra_pcie_dw_of_data tegra_pcie_dw_rc_of_data = { 2263 .mode = DW_PCIE_RC_TYPE, 2264 }; 2265 2266 static const struct tegra_pcie_dw_of_data tegra_pcie_dw_ep_of_data = { 2267 .mode = DW_PCIE_EP_TYPE, 2268 }; 2269 2270 static const struct of_device_id tegra_pcie_dw_of_match[] = { 2271 { 2272 .compatible = "nvidia,tegra194-pcie", 2273 .data = &tegra_pcie_dw_rc_of_data, 2274 }, 2275 { 2276 .compatible = "nvidia,tegra194-pcie-ep", 2277 .data = &tegra_pcie_dw_ep_of_data, 2278 }, 2279 {}, 2280 }; 2281 2282 static const struct dev_pm_ops tegra_pcie_dw_pm_ops = { 2283 .suspend_late = tegra_pcie_dw_suspend_late, 2284 .suspend_noirq = tegra_pcie_dw_suspend_noirq, 2285 .resume_noirq = tegra_pcie_dw_resume_noirq, 2286 .resume_early = tegra_pcie_dw_resume_early, 2287 }; 2288 2289 static struct platform_driver tegra_pcie_dw_driver = { 2290 .probe = tegra_pcie_dw_probe, 2291 .remove = tegra_pcie_dw_remove, 2292 .shutdown = tegra_pcie_dw_shutdown, 2293 .driver = { 2294 .name = "tegra194-pcie", 2295 .pm = &tegra_pcie_dw_pm_ops, 2296 .of_match_table = tegra_pcie_dw_of_match, 2297 }, 2298 }; 2299 module_platform_driver(tegra_pcie_dw_driver); 2300 2301 MODULE_DEVICE_TABLE(of, tegra_pcie_dw_of_match); 2302 2303 MODULE_AUTHOR("Vidya Sagar <vidyas@nvidia.com>"); 2304 MODULE_DESCRIPTION("NVIDIA PCIe host controller driver"); 2305 MODULE_LICENSE("GPL v2"); 2306