| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Vidya Sagar | 10324 | 91.68% | 22 | 30.99% |
| Rob Herring | 179 | 1.59% | 7 | 9.86% |
| sumitg | 171 | 1.52% | 2 | 2.82% |
| Kishon Vijay Abraham I | 161 | 1.43% | 6 | 8.45% |
| Thierry Reding | 118 | 1.05% | 1 | 1.41% |
| Jingoo Han | 55 | 0.49% | 3 | 4.23% |
| Om Prakash Singh | 47 | 0.42% | 4 | 5.63% |
| Manivannan Sadhasivam | 43 | 0.38% | 2 | 2.82% |
| Ilpo Järvinen | 41 | 0.36% | 2 | 2.82% |
| Gabriele Paoloni | 23 | 0.20% | 1 | 1.41% |
| Björn Helgaas | 13 | 0.12% | 2 | 2.82% |
| Niklas Cassel | 12 | 0.11% | 1 | 1.41% |
| Jon Hunter | 11 | 0.10% | 2 | 2.82% |
| Serge Semin | 11 | 0.10% | 1 | 1.41% |
| Gustavo Pimentel | 7 | 0.06% | 2 | 2.82% |
| Jonathan Chocron | 6 | 0.05% | 1 | 1.41% |
| Stanimir Varbanov | 6 | 0.05% | 1 | 1.41% |
| Miaoqian Lin | 5 | 0.04% | 1 | 1.41% |
| Murali Karicheri | 5 | 0.04% | 1 | 1.41% |
| Aman Sharma | 5 | 0.04% | 1 | 1.41% |
| Cyrille Pitchen | 3 | 0.03% | 1 | 1.41% |
| Dinghao Liu | 3 | 0.03% | 2 | 2.82% |
| Dmitry Eremin-Solenikov | 3 | 0.03% | 1 | 1.41% |
| Greg Kroah-Hartman | 3 | 0.03% | 1 | 1.41% |
| Uwe Kleine-König | 3 | 0.03% | 1 | 1.41% |
| Rikard Falkeborn | 2 | 0.02% | 1 | 1.41% |
| Pratyush Anand | 1 | 0.01% | 1 | 1.41% |
| Total | 11261 | 71 |
// SPDX-License-Identifier: GPL-2.0+ /* * PCIe host controller driver for the following SoCs * Tegra194 * Tegra234 * * Copyright (C) 2019-2022 NVIDIA Corporation. * * Author: Vidya Sagar <vidyas@nvidia.com> */ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/gpio.h> #include <linux/gpio/consumer.h> #include <linux/interconnect.h> #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/of_pci.h> #include <linux/pci.h> #include <linux/phy/phy.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/random.h> #include <linux/reset.h> #include <linux/resource.h> #include <linux/types.h> #include "pcie-designware.h" #include <soc/tegra/bpmp.h> #include <soc/tegra/bpmp-abi.h> #include "../../pci.h" #define TEGRA194_DWC_IP_VER 0x490A #define TEGRA234_DWC_IP_VER 0x562A #define APPL_PINMUX 0x0 #define APPL_PINMUX_PEX_RST BIT(0) #define APPL_PINMUX_CLKREQ_OVERRIDE_EN BIT(2) #define APPL_PINMUX_CLKREQ_OVERRIDE BIT(3) #define APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN BIT(4) #define APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE BIT(5) #define APPL_CTRL 0x4 #define APPL_CTRL_SYS_PRE_DET_STATE BIT(6) #define APPL_CTRL_LTSSM_EN BIT(7) #define APPL_CTRL_HW_HOT_RST_EN BIT(20) #define APPL_CTRL_HW_HOT_RST_MODE_MASK GENMASK(1, 0) #define APPL_CTRL_HW_HOT_RST_MODE_SHIFT 22 #define APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST 0x1 #define APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST_LTSSM_EN 0x2 #define APPL_INTR_EN_L0_0 0x8 #define APPL_INTR_EN_L0_0_LINK_STATE_INT_EN BIT(0) #define APPL_INTR_EN_L0_0_MSI_RCV_INT_EN BIT(4) #define APPL_INTR_EN_L0_0_INT_INT_EN BIT(8) #define APPL_INTR_EN_L0_0_PCI_CMD_EN_INT_EN BIT(15) #define APPL_INTR_EN_L0_0_CDM_REG_CHK_INT_EN BIT(19) #define APPL_INTR_EN_L0_0_SYS_INTR_EN BIT(30) #define APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN BIT(31) #define APPL_INTR_STATUS_L0 0xC #define APPL_INTR_STATUS_L0_LINK_STATE_INT BIT(0) #define APPL_INTR_STATUS_L0_INT_INT BIT(8) #define APPL_INTR_STATUS_L0_PCI_CMD_EN_INT BIT(15) #define APPL_INTR_STATUS_L0_PEX_RST_INT BIT(16) #define APPL_INTR_STATUS_L0_CDM_REG_CHK_INT BIT(18) #define APPL_INTR_EN_L1_0_0 0x1C #define APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN BIT(1) #define APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN BIT(3) #define APPL_INTR_EN_L1_0_0_HOT_RESET_DONE_INT_EN BIT(30) #define APPL_INTR_STATUS_L1_0_0 0x20 #define APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED BIT(1) #define APPL_INTR_STATUS_L1_0_0_RDLH_LINK_UP_CHGED BIT(3) #define APPL_INTR_STATUS_L1_0_0_HOT_RESET_DONE BIT(30) #define APPL_INTR_STATUS_L1_1 0x2C #define APPL_INTR_STATUS_L1_2 0x30 #define APPL_INTR_STATUS_L1_3 0x34 #define APPL_INTR_STATUS_L1_6 0x3C #define APPL_INTR_STATUS_L1_7 0x40 #define APPL_INTR_STATUS_L1_15_CFG_BME_CHGED BIT(1) #define APPL_INTR_EN_L1_8_0 0x44 #define APPL_INTR_EN_L1_8_BW_MGT_INT_EN BIT(2) #define APPL_INTR_EN_L1_8_AUTO_BW_INT_EN BIT(3) #define APPL_INTR_EN_L1_8_INTX_EN BIT(11) #define APPL_INTR_EN_L1_8_AER_INT_EN BIT(15) #define APPL_INTR_STATUS_L1_8_0 0x4C #define APPL_INTR_STATUS_L1_8_0_EDMA_INT_MASK GENMASK(11, 6) #define APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS BIT(2) #define APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS BIT(3) #define APPL_INTR_STATUS_L1_9 0x54 #define APPL_INTR_STATUS_L1_10 0x58 #define APPL_INTR_STATUS_L1_11 0x64 #define APPL_INTR_STATUS_L1_13 0x74 #define APPL_INTR_STATUS_L1_14 0x78 #define APPL_INTR_STATUS_L1_15 0x7C #define APPL_INTR_STATUS_L1_17 0x88 #define APPL_INTR_EN_L1_18 0x90 #define APPL_INTR_EN_L1_18_CDM_REG_CHK_CMPLT BIT(2) #define APPL_INTR_EN_L1_18_CDM_REG_CHK_CMP_ERR BIT(1) #define APPL_INTR_EN_L1_18_CDM_REG_CHK_LOGIC_ERR BIT(0) #define APPL_INTR_STATUS_L1_18 0x94 #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT BIT(2) #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR BIT(1) #define APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR BIT(0) #define APPL_MSI_CTRL_1 0xAC #define APPL_MSI_CTRL_2 0xB0 #define APPL_LEGACY_INTX 0xB8 #define APPL_LTR_MSG_1 0xC4 #define LTR_MSG_REQ BIT(15) #define LTR_NOSNOOP_MSG_REQ BIT(31) #define APPL_LTR_MSG_2 0xC8 #define APPL_LTR_MSG_2_LTR_MSG_REQ_STATE BIT(3) #define APPL_LINK_STATUS 0xCC #define APPL_LINK_STATUS_RDLH_LINK_UP BIT(0) #define APPL_DEBUG 0xD0 #define APPL_DEBUG_PM_LINKST_IN_L2_LAT BIT(21) #define APPL_DEBUG_PM_LINKST_IN_L0 0x11 #define APPL_DEBUG_LTSSM_STATE_MASK GENMASK(8, 3) #define APPL_DEBUG_LTSSM_STATE_SHIFT 3 #define LTSSM_STATE_PRE_DETECT 5 #define APPL_RADM_STATUS 0xE4 #define APPL_PM_XMT_TURNOFF_STATE BIT(0) #define APPL_DM_TYPE 0x100 #define APPL_DM_TYPE_MASK GENMASK(3, 0) #define APPL_DM_TYPE_RP 0x4 #define APPL_DM_TYPE_EP 0x0 #define APPL_CFG_BASE_ADDR 0x104 #define APPL_CFG_BASE_ADDR_MASK GENMASK(31, 12) #define APPL_CFG_IATU_DMA_BASE_ADDR 0x108 #define APPL_CFG_IATU_DMA_BASE_ADDR_MASK GENMASK(31, 18) #define APPL_CFG_MISC 0x110 #define APPL_CFG_MISC_SLV_EP_MODE BIT(14) #define APPL_CFG_MISC_ARCACHE_MASK GENMASK(13, 10) #define APPL_CFG_MISC_ARCACHE_SHIFT 10 #define APPL_CFG_MISC_ARCACHE_VAL 3 #define APPL_CFG_SLCG_OVERRIDE 0x114 #define APPL_CFG_SLCG_OVERRIDE_SLCG_EN_MASTER BIT(0) #define APPL_CAR_RESET_OVRD 0x12C #define APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N BIT(0) #define IO_BASE_IO_DECODE BIT(0) #define IO_BASE_IO_DECODE_BIT8 BIT(8) #define CFG_PREF_MEM_LIMIT_BASE_MEM_DECODE BIT(0) #define CFG_PREF_MEM_LIMIT_BASE_MEM_LIMIT_DECODE BIT(16) #define CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF 0x718 #define CFG_TIMER_CTRL_ACK_NAK_SHIFT (19) #define N_FTS_VAL 52 #define FTS_VAL 52 #define GEN3_EQ_CONTROL_OFF 0x8a8 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT 8 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK GENMASK(23, 8) #define GEN3_EQ_CONTROL_OFF_FB_MODE_MASK GENMASK(3, 0) #define PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT 0x8D0 #define AMBA_ERROR_RESPONSE_CRS_SHIFT 3 #define AMBA_ERROR_RESPONSE_CRS_MASK GENMASK(1, 0) #define AMBA_ERROR_RESPONSE_CRS_OKAY 0 #define AMBA_ERROR_RESPONSE_CRS_OKAY_FFFFFFFF 1 #define AMBA_ERROR_RESPONSE_CRS_OKAY_FFFF0001 2 #define MSIX_ADDR_MATCH_LOW_OFF 0x940 #define MSIX_ADDR_MATCH_LOW_OFF_EN BIT(0) #define MSIX_ADDR_MATCH_LOW_OFF_MASK GENMASK(31, 2) #define MSIX_ADDR_MATCH_HIGH_OFF 0x944 #define MSIX_ADDR_MATCH_HIGH_OFF_MASK GENMASK(31, 0) #define PORT_LOGIC_MSIX_DOORBELL 0x948 #define CAP_SPCIE_CAP_OFF 0x154 #define CAP_SPCIE_CAP_OFF_DSP_TX_PRESET0_MASK GENMASK(3, 0) #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK GENMASK(11, 8) #define CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT 8 #define PME_ACK_TIMEOUT 10000 #define LTSSM_TIMEOUT 50000 /* 50ms */ #define GEN3_GEN4_EQ_PRESET_INIT 5 #define GEN1_CORE_CLK_FREQ 62500000 #define GEN2_CORE_CLK_FREQ 125000000 #define GEN3_CORE_CLK_FREQ 250000000 #define GEN4_CORE_CLK_FREQ 500000000 #define LTR_MSG_TIMEOUT (100 * 1000) #define PERST_DEBOUNCE_TIME (5 * 1000) #define EP_STATE_DISABLED 0 #define EP_STATE_ENABLED 1 static const unsigned int pcie_gen_freq[] = { GEN1_CORE_CLK_FREQ, /* PCI_EXP_LNKSTA_CLS == 0; undefined */ GEN1_CORE_CLK_FREQ, GEN2_CORE_CLK_FREQ, GEN3_CORE_CLK_FREQ, GEN4_CORE_CLK_FREQ }; struct tegra_pcie_dw_of_data { u32 version; enum dw_pcie_device_mode mode; bool has_msix_doorbell_access_fix; bool has_sbr_reset_fix; bool has_l1ss_exit_fix; bool has_ltr_req_fix; u32 cdm_chk_int_en_bit; u32 gen4_preset_vec; u8 n_fts[2]; }; struct tegra_pcie_dw { struct device *dev; struct resource *appl_res; struct resource *dbi_res; struct resource *atu_dma_res; void __iomem *appl_base; struct clk *core_clk; struct reset_control *core_apb_rst; struct reset_control *core_rst; struct dw_pcie pci; struct tegra_bpmp *bpmp; struct tegra_pcie_dw_of_data *of_data; bool supports_clkreq; bool enable_cdm_check; bool enable_srns; bool link_state; bool update_fc_fixup; bool enable_ext_refclk; u8 init_link_width; u32 msi_ctrl_int; u32 num_lanes; u32 cid; u32 cfg_link_cap_l1sub; u32 ras_des_cap; u32 pcie_cap_base; u32 aspm_cmrt; u32 aspm_pwr_on_t; u32 aspm_l0s_enter_lat; struct regulator *pex_ctl_supply; struct regulator *slot_ctl_3v3; struct regulator *slot_ctl_12v; unsigned int phy_count; struct phy **phys; struct dentry *debugfs; /* Endpoint mode specific */ struct gpio_desc *pex_rst_gpiod; struct gpio_desc *pex_refclk_sel_gpiod; unsigned int pex_rst_irq; int ep_state; long link_status; struct icc_path *icc_path; }; static inline struct tegra_pcie_dw *to_tegra_pcie(struct dw_pcie *pci) { return container_of(pci, struct tegra_pcie_dw, pci); } static inline void appl_writel(struct tegra_pcie_dw *pcie, const u32 value, const u32 reg) { writel_relaxed(value, pcie->appl_base + reg); } static inline u32 appl_readl(struct tegra_pcie_dw *pcie, const u32 reg) { return readl_relaxed(pcie->appl_base + reg); } struct tegra_pcie_soc { enum dw_pcie_device_mode mode; }; static void tegra_pcie_icc_set(struct tegra_pcie_dw *pcie) { struct dw_pcie *pci = &pcie->pci; u32 val, speed, width; val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, val); width = FIELD_GET(PCI_EXP_LNKSTA_NLW, val); val = width * PCIE_SPEED2MBS_ENC(pcie_link_speed[speed]); if (icc_set_bw(pcie->icc_path, Mbps_to_icc(val), 0)) dev_err(pcie->dev, "can't set bw[%u]\n", val); if (speed >= ARRAY_SIZE(pcie_gen_freq)) speed = 0; clk_set_rate(pcie->core_clk, pcie_gen_freq[speed]); } static void apply_bad_link_workaround(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); u32 current_link_width; u16 val; /* * NOTE:- Since this scenario is uncommon and link as such is not * stable anyway, not waiting to confirm if link is really * transitioning to Gen-2 speed */ val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); if (val & PCI_EXP_LNKSTA_LBMS) { current_link_width = FIELD_GET(PCI_EXP_LNKSTA_NLW, val); if (pcie->init_link_width > current_link_width) { dev_warn(pci->dev, "PCIe link is bad, width reduced\n"); val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL2); val &= ~PCI_EXP_LNKCTL2_TLS; val |= PCI_EXP_LNKCTL2_TLS_2_5GT; dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL2, val); val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL); val |= PCI_EXP_LNKCTL_RL; dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL, val); } } } static irqreturn_t tegra_pcie_rp_irq_handler(int irq, void *arg) { struct tegra_pcie_dw *pcie = arg; struct dw_pcie *pci = &pcie->pci; struct dw_pcie_rp *pp = &pci->pp; u32 val, status_l0, status_l1; u16 val_w; status_l0 = appl_readl(pcie, APPL_INTR_STATUS_L0); if (status_l0 & APPL_INTR_STATUS_L0_LINK_STATE_INT) { status_l1 = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0); appl_writel(pcie, status_l1, APPL_INTR_STATUS_L1_0_0); if (!pcie->of_data->has_sbr_reset_fix && status_l1 & APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED) { /* SBR & Surprise Link Down WAR */ val = appl_readl(pcie, APPL_CAR_RESET_OVRD); val &= ~APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N; appl_writel(pcie, val, APPL_CAR_RESET_OVRD); udelay(1); val = appl_readl(pcie, APPL_CAR_RESET_OVRD); val |= APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N; appl_writel(pcie, val, APPL_CAR_RESET_OVRD); val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL); val |= PORT_LOGIC_SPEED_CHANGE; dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val); } } if (status_l0 & APPL_INTR_STATUS_L0_INT_INT) { status_l1 = appl_readl(pcie, APPL_INTR_STATUS_L1_8_0); if (status_l1 & APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS) { appl_writel(pcie, APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS, APPL_INTR_STATUS_L1_8_0); apply_bad_link_workaround(pp); } if (status_l1 & APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS) { val_w = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); val_w |= PCI_EXP_LNKSTA_LBMS; dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA, val_w); appl_writel(pcie, APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS, APPL_INTR_STATUS_L1_8_0); val_w = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); dev_dbg(pci->dev, "Link Speed : Gen-%u\n", val_w & PCI_EXP_LNKSTA_CLS); } } if (status_l0 & APPL_INTR_STATUS_L0_CDM_REG_CHK_INT) { status_l1 = appl_readl(pcie, APPL_INTR_STATUS_L1_18); val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS); if (status_l1 & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT) { dev_info(pci->dev, "CDM check complete\n"); val |= PCIE_PL_CHK_REG_CHK_REG_COMPLETE; } if (status_l1 & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR) { dev_err(pci->dev, "CDM comparison mismatch\n"); val |= PCIE_PL_CHK_REG_CHK_REG_COMPARISON_ERROR; } if (status_l1 & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR) { dev_err(pci->dev, "CDM Logic error\n"); val |= PCIE_PL_CHK_REG_CHK_REG_LOGIC_ERROR; } dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val); val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_ERR_ADDR); dev_err(pci->dev, "CDM Error Address Offset = 0x%08X\n", val); } return IRQ_HANDLED; } static void pex_ep_event_hot_rst_done(struct tegra_pcie_dw *pcie) { u32 val; appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17); appl_writel(pcie, 0xFFFFFFFF, APPL_MSI_CTRL_2); val = appl_readl(pcie, APPL_CTRL); val |= APPL_CTRL_LTSSM_EN; appl_writel(pcie, val, APPL_CTRL); } static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg) { struct tegra_pcie_dw *pcie = arg; struct dw_pcie_ep *ep = &pcie->pci.ep; struct dw_pcie *pci = &pcie->pci; u32 val; if (test_and_clear_bit(0, &pcie->link_status)) dw_pcie_ep_linkup(ep); tegra_pcie_icc_set(pcie); if (pcie->of_data->has_ltr_req_fix) return IRQ_HANDLED; /* If EP doesn't advertise L1SS, just return */ val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub); if (!(val & (PCI_L1SS_CAP_ASPM_L1_1 | PCI_L1SS_CAP_ASPM_L1_2))) return IRQ_HANDLED; /* Check if BME is set to '1' */ val = dw_pcie_readl_dbi(pci, PCI_COMMAND); if (val & PCI_COMMAND_MASTER) { ktime_t timeout; /* 110us for both snoop and no-snoop */ val = FIELD_PREP(PCI_LTR_VALUE_MASK, 110) | FIELD_PREP(PCI_LTR_SCALE_MASK, 2) | LTR_MSG_REQ | FIELD_PREP(PCI_LTR_NOSNOOP_VALUE, 110) | FIELD_PREP(PCI_LTR_NOSNOOP_SCALE, 2) | LTR_NOSNOOP_MSG_REQ; appl_writel(pcie, val, APPL_LTR_MSG_1); /* Send LTR upstream */ val = appl_readl(pcie, APPL_LTR_MSG_2); val |= APPL_LTR_MSG_2_LTR_MSG_REQ_STATE; appl_writel(pcie, val, APPL_LTR_MSG_2); timeout = ktime_add_us(ktime_get(), LTR_MSG_TIMEOUT); for (;;) { val = appl_readl(pcie, APPL_LTR_MSG_2); if (!(val & APPL_LTR_MSG_2_LTR_MSG_REQ_STATE)) break; if (ktime_after(ktime_get(), timeout)) break; usleep_range(1000, 1100); } if (val & APPL_LTR_MSG_2_LTR_MSG_REQ_STATE) dev_err(pcie->dev, "Failed to send LTR message\n"); } return IRQ_HANDLED; } static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg) { struct tegra_pcie_dw *pcie = arg; int spurious = 1; u32 status_l0, status_l1, link_status; status_l0 = appl_readl(pcie, APPL_INTR_STATUS_L0); if (status_l0 & APPL_INTR_STATUS_L0_LINK_STATE_INT) { status_l1 = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0); appl_writel(pcie, status_l1, APPL_INTR_STATUS_L1_0_0); if (status_l1 & APPL_INTR_STATUS_L1_0_0_HOT_RESET_DONE) pex_ep_event_hot_rst_done(pcie); if (status_l1 & APPL_INTR_STATUS_L1_0_0_RDLH_LINK_UP_CHGED) { link_status = appl_readl(pcie, APPL_LINK_STATUS); if (link_status & APPL_LINK_STATUS_RDLH_LINK_UP) { dev_dbg(pcie->dev, "Link is up with Host\n"); set_bit(0, &pcie->link_status); return IRQ_WAKE_THREAD; } } spurious = 0; } if (status_l0 & APPL_INTR_STATUS_L0_PCI_CMD_EN_INT) { status_l1 = appl_readl(pcie, APPL_INTR_STATUS_L1_15); appl_writel(pcie, status_l1, APPL_INTR_STATUS_L1_15); if (status_l1 & APPL_INTR_STATUS_L1_15_CFG_BME_CHGED) return IRQ_WAKE_THREAD; spurious = 0; } if (spurious) { dev_warn(pcie->dev, "Random interrupt (STATUS = 0x%08X)\n", status_l0); appl_writel(pcie, status_l0, APPL_INTR_STATUS_L0); } return IRQ_HANDLED; } static int tegra_pcie_dw_rd_own_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 *val) { struct dw_pcie_rp *pp = bus->sysdata; struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); /* * This is an endpoint mode specific register happen to appear even * when controller is operating in root port mode and system hangs * when it is accessed with link being in ASPM-L1 state. * So skip accessing it altogether */ if (!pcie->of_data->has_msix_doorbell_access_fix && !PCI_SLOT(devfn) && where == PORT_LOGIC_MSIX_DOORBELL) { *val = 0x00000000; return PCIBIOS_SUCCESSFUL; } return pci_generic_config_read(bus, devfn, where, size, val); } static int tegra_pcie_dw_wr_own_conf(struct pci_bus *bus, u32 devfn, int where, int size, u32 val) { struct dw_pcie_rp *pp = bus->sysdata; struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); /* * This is an endpoint mode specific register happen to appear even * when controller is operating in root port mode and system hangs * when it is accessed with link being in ASPM-L1 state. * So skip accessing it altogether */ if (!pcie->of_data->has_msix_doorbell_access_fix && !PCI_SLOT(devfn) && where == PORT_LOGIC_MSIX_DOORBELL) return PCIBIOS_SUCCESSFUL; return pci_generic_config_write(bus, devfn, where, size, val); } static struct pci_ops tegra_pci_ops = { .map_bus = dw_pcie_own_conf_map_bus, .read = tegra_pcie_dw_rd_own_conf, .write = tegra_pcie_dw_wr_own_conf, }; #if defined(CONFIG_PCIEASPM) static void disable_aspm_l11(struct tegra_pcie_dw *pcie) { u32 val; val = dw_pcie_readl_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub); val &= ~PCI_L1SS_CAP_ASPM_L1_1; dw_pcie_writel_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub, val); } static void disable_aspm_l12(struct tegra_pcie_dw *pcie) { u32 val; val = dw_pcie_readl_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub); val &= ~PCI_L1SS_CAP_ASPM_L1_2; dw_pcie_writel_dbi(&pcie->pci, pcie->cfg_link_cap_l1sub, val); } static inline u32 event_counter_prog(struct tegra_pcie_dw *pcie, u32 event) { u32 val; val = dw_pcie_readl_dbi(&pcie->pci, pcie->ras_des_cap + PCIE_RAS_DES_EVENT_COUNTER_CONTROL); val &= ~(EVENT_COUNTER_EVENT_SEL_MASK << EVENT_COUNTER_EVENT_SEL_SHIFT); val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT; val |= event << EVENT_COUNTER_EVENT_SEL_SHIFT; val |= EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT; dw_pcie_writel_dbi(&pcie->pci, pcie->ras_des_cap + PCIE_RAS_DES_EVENT_COUNTER_CONTROL, val); val = dw_pcie_readl_dbi(&pcie->pci, pcie->ras_des_cap + PCIE_RAS_DES_EVENT_COUNTER_DATA); return val; } static int aspm_state_cnt(struct seq_file *s, void *data) { struct tegra_pcie_dw *pcie = (struct tegra_pcie_dw *) dev_get_drvdata(s->private); u32 val; seq_printf(s, "Tx L0s entry count : %u\n", event_counter_prog(pcie, EVENT_COUNTER_EVENT_Tx_L0S)); seq_printf(s, "Rx L0s entry count : %u\n", event_counter_prog(pcie, EVENT_COUNTER_EVENT_Rx_L0S)); seq_printf(s, "Link L1 entry count : %u\n", event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1)); seq_printf(s, "Link L1.1 entry count : %u\n", event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1_1)); seq_printf(s, "Link L1.2 entry count : %u\n", event_counter_prog(pcie, EVENT_COUNTER_EVENT_L1_2)); /* Clear all counters */ dw_pcie_writel_dbi(&pcie->pci, pcie->ras_des_cap + PCIE_RAS_DES_EVENT_COUNTER_CONTROL, EVENT_COUNTER_ALL_CLEAR); /* Re-enable counting */ val = EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT; val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT; dw_pcie_writel_dbi(&pcie->pci, pcie->ras_des_cap + PCIE_RAS_DES_EVENT_COUNTER_CONTROL, val); return 0; } static void init_host_aspm(struct tegra_pcie_dw *pcie) { struct dw_pcie *pci = &pcie->pci; u32 val; val = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS); pcie->cfg_link_cap_l1sub = val + PCI_L1SS_CAP; pcie->ras_des_cap = dw_pcie_find_ext_capability(&pcie->pci, PCI_EXT_CAP_ID_VNDR); /* Enable ASPM counters */ val = EVENT_COUNTER_ENABLE_ALL << EVENT_COUNTER_ENABLE_SHIFT; val |= EVENT_COUNTER_GROUP_5 << EVENT_COUNTER_GROUP_SEL_SHIFT; dw_pcie_writel_dbi(pci, pcie->ras_des_cap + PCIE_RAS_DES_EVENT_COUNTER_CONTROL, val); /* Program T_cmrt and T_pwr_on values */ val = dw_pcie_readl_dbi(pci, pcie->cfg_link_cap_l1sub); val &= ~(PCI_L1SS_CAP_CM_RESTORE_TIME | PCI_L1SS_CAP_P_PWR_ON_VALUE); val |= (pcie->aspm_cmrt << 8); val |= (pcie->aspm_pwr_on_t << 19); dw_pcie_writel_dbi(pci, pcie->cfg_link_cap_l1sub, val); /* Program L0s and L1 entrance latencies */ val = dw_pcie_readl_dbi(pci, PCIE_PORT_AFR); val &= ~PORT_AFR_L0S_ENTRANCE_LAT_MASK; val |= (pcie->aspm_l0s_enter_lat << PORT_AFR_L0S_ENTRANCE_LAT_SHIFT); val |= PORT_AFR_ENTER_ASPM; dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val); } static void init_debugfs(struct tegra_pcie_dw *pcie) { debugfs_create_devm_seqfile(pcie->dev, "aspm_state_cnt", pcie->debugfs, aspm_state_cnt); } #else static inline void disable_aspm_l12(struct tegra_pcie_dw *pcie) { return; } static inline void disable_aspm_l11(struct tegra_pcie_dw *pcie) { return; } static inline void init_host_aspm(struct tegra_pcie_dw *pcie) { return; } static inline void init_debugfs(struct tegra_pcie_dw *pcie) { return; } #endif static void tegra_pcie_enable_system_interrupts(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); u32 val; u16 val_w; val = appl_readl(pcie, APPL_INTR_EN_L0_0); val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L0_0); if (!pcie->of_data->has_sbr_reset_fix) { val = appl_readl(pcie, APPL_INTR_EN_L1_0_0); val |= APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L1_0_0); } if (pcie->enable_cdm_check) { val = appl_readl(pcie, APPL_INTR_EN_L0_0); val |= pcie->of_data->cdm_chk_int_en_bit; appl_writel(pcie, val, APPL_INTR_EN_L0_0); val = appl_readl(pcie, APPL_INTR_EN_L1_18); val |= APPL_INTR_EN_L1_18_CDM_REG_CHK_CMP_ERR; val |= APPL_INTR_EN_L1_18_CDM_REG_CHK_LOGIC_ERR; appl_writel(pcie, val, APPL_INTR_EN_L1_18); } val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); pcie->init_link_width = FIELD_GET(PCI_EXP_LNKSTA_NLW, val_w); val_w = dw_pcie_readw_dbi(&pcie->pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL); val_w |= PCI_EXP_LNKCTL_LBMIE; dw_pcie_writew_dbi(&pcie->pci, pcie->pcie_cap_base + PCI_EXP_LNKCTL, val_w); } static void tegra_pcie_enable_legacy_interrupts(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); u32 val; /* Enable legacy interrupt generation */ val = appl_readl(pcie, APPL_INTR_EN_L0_0); val |= APPL_INTR_EN_L0_0_SYS_INTR_EN; val |= APPL_INTR_EN_L0_0_INT_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L0_0); val = appl_readl(pcie, APPL_INTR_EN_L1_8_0); val |= APPL_INTR_EN_L1_8_INTX_EN; val |= APPL_INTR_EN_L1_8_AUTO_BW_INT_EN; val |= APPL_INTR_EN_L1_8_BW_MGT_INT_EN; if (IS_ENABLED(CONFIG_PCIEAER)) val |= APPL_INTR_EN_L1_8_AER_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L1_8_0); } static void tegra_pcie_enable_msi_interrupts(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); u32 val; /* Enable MSI interrupt generation */ val = appl_readl(pcie, APPL_INTR_EN_L0_0); val |= APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN; val |= APPL_INTR_EN_L0_0_MSI_RCV_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L0_0); } static void tegra_pcie_enable_interrupts(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); /* Clear interrupt statuses before enabling interrupts */ appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17); tegra_pcie_enable_system_interrupts(pp); tegra_pcie_enable_legacy_interrupts(pp); if (IS_ENABLED(CONFIG_PCI_MSI)) tegra_pcie_enable_msi_interrupts(pp); } static void config_gen3_gen4_eq_presets(struct tegra_pcie_dw *pcie) { struct dw_pcie *pci = &pcie->pci; u32 val, offset, i; /* Program init preset */ for (i = 0; i < pcie->num_lanes; i++) { val = dw_pcie_readw_dbi(pci, CAP_SPCIE_CAP_OFF + (i * 2)); val &= ~CAP_SPCIE_CAP_OFF_DSP_TX_PRESET0_MASK; val |= GEN3_GEN4_EQ_PRESET_INIT; val &= ~CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_MASK; val |= (GEN3_GEN4_EQ_PRESET_INIT << CAP_SPCIE_CAP_OFF_USP_TX_PRESET0_SHIFT); dw_pcie_writew_dbi(pci, CAP_SPCIE_CAP_OFF + (i * 2), val); offset = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_PL_16GT) + PCI_PL_16GT_LE_CTRL; val = dw_pcie_readb_dbi(pci, offset + i); val &= ~PCI_PL_16GT_LE_CTRL_DSP_TX_PRESET_MASK; val |= GEN3_GEN4_EQ_PRESET_INIT; val &= ~PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_MASK; val |= (GEN3_GEN4_EQ_PRESET_INIT << PCI_PL_16GT_LE_CTRL_USP_TX_PRESET_SHIFT); dw_pcie_writeb_dbi(pci, offset + i, val); } val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); val = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); val &= ~GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK; val |= (0x3ff << GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT); val &= ~GEN3_EQ_CONTROL_OFF_FB_MODE_MASK; dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, val); val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; val |= (0x1 << GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT); dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); val = dw_pcie_readl_dbi(pci, GEN3_EQ_CONTROL_OFF); val &= ~GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK; val |= (pcie->of_data->gen4_preset_vec << GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT); val &= ~GEN3_EQ_CONTROL_OFF_FB_MODE_MASK; dw_pcie_writel_dbi(pci, GEN3_EQ_CONTROL_OFF, val); val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK; dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); } static int tegra_pcie_dw_host_init(struct dw_pcie_rp *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); u32 val; u16 val_16; pp->bridge->ops = &tegra_pci_ops; if (!pcie->pcie_cap_base) pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci, PCI_CAP_ID_EXP); val = dw_pcie_readl_dbi(pci, PCI_IO_BASE); val &= ~(IO_BASE_IO_DECODE | IO_BASE_IO_DECODE_BIT8); dw_pcie_writel_dbi(pci, PCI_IO_BASE, val); val = dw_pcie_readl_dbi(pci, PCI_PREF_MEMORY_BASE); val |= CFG_PREF_MEM_LIMIT_BASE_MEM_DECODE; val |= CFG_PREF_MEM_LIMIT_BASE_MEM_LIMIT_DECODE; dw_pcie_writel_dbi(pci, PCI_PREF_MEMORY_BASE, val); dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0); /* Enable as 0xFFFF0001 response for CRS */ val = dw_pcie_readl_dbi(pci, PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT); val &= ~(AMBA_ERROR_RESPONSE_CRS_MASK << AMBA_ERROR_RESPONSE_CRS_SHIFT); val |= (AMBA_ERROR_RESPONSE_CRS_OKAY_FFFF0001 << AMBA_ERROR_RESPONSE_CRS_SHIFT); dw_pcie_writel_dbi(pci, PORT_LOGIC_AMBA_ERROR_RESPONSE_DEFAULT, val); /* Clear Slot Clock Configuration bit if SRNS configuration */ if (pcie->enable_srns) { val_16 = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); val_16 &= ~PCI_EXP_LNKSTA_SLC; dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA, val_16); } config_gen3_gen4_eq_presets(pcie); init_host_aspm(pcie); /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */ if (!pcie->supports_clkreq) { disable_aspm_l11(pcie); disable_aspm_l12(pcie); } if (!pcie->of_data->has_l1ss_exit_fix) { val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); } if (pcie->update_fc_fixup) { val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF); val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT; dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF, val); } clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ); return 0; } static int tegra_pcie_dw_start_link(struct dw_pcie *pci) { struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); struct dw_pcie_rp *pp = &pci->pp; u32 val, offset, tmp; bool retry = true; if (pcie->of_data->mode == DW_PCIE_EP_TYPE) { enable_irq(pcie->pex_rst_irq); return 0; } retry_link: /* Assert RST */ val = appl_readl(pcie, APPL_PINMUX); val &= ~APPL_PINMUX_PEX_RST; appl_writel(pcie, val, APPL_PINMUX); usleep_range(100, 200); /* Enable LTSSM */ val = appl_readl(pcie, APPL_CTRL); val |= APPL_CTRL_LTSSM_EN; appl_writel(pcie, val, APPL_CTRL); /* De-assert RST */ val = appl_readl(pcie, APPL_PINMUX); val |= APPL_PINMUX_PEX_RST; appl_writel(pcie, val, APPL_PINMUX); msleep(100); if (dw_pcie_wait_for_link(pci)) { if (!retry) return 0; /* * There are some endpoints which can't get the link up if * root port has Data Link Feature (DLF) enabled. * Refer Spec rev 4.0 ver 1.0 sec 3.4.2 & 7.7.4 for more info * on Scaled Flow Control and DLF. * So, need to confirm that is indeed the case here and attempt * link up once again with DLF disabled. */ val = appl_readl(pcie, APPL_DEBUG); val &= APPL_DEBUG_LTSSM_STATE_MASK; val >>= APPL_DEBUG_LTSSM_STATE_SHIFT; tmp = appl_readl(pcie, APPL_LINK_STATUS); tmp &= APPL_LINK_STATUS_RDLH_LINK_UP; if (!(val == 0x11 && !tmp)) { /* Link is down for all good reasons */ return 0; } dev_info(pci->dev, "Link is down in DLL"); dev_info(pci->dev, "Trying again with DLFE disabled\n"); /* Disable LTSSM */ val = appl_readl(pcie, APPL_CTRL); val &= ~APPL_CTRL_LTSSM_EN; appl_writel(pcie, val, APPL_CTRL); reset_control_assert(pcie->core_rst); reset_control_deassert(pcie->core_rst); offset = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_DLF); val = dw_pcie_readl_dbi(pci, offset + PCI_DLF_CAP); val &= ~PCI_DLF_EXCHANGE_ENABLE; dw_pcie_writel_dbi(pci, offset + PCI_DLF_CAP, val); tegra_pcie_dw_host_init(pp); dw_pcie_setup_rc(pp); retry = false; goto retry_link; } tegra_pcie_icc_set(pcie); tegra_pcie_enable_interrupts(pp); return 0; } static int tegra_pcie_dw_link_up(struct dw_pcie *pci) { struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); u32 val = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); return !!(val & PCI_EXP_LNKSTA_DLLLA); } static void tegra_pcie_dw_stop_link(struct dw_pcie *pci) { struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); disable_irq(pcie->pex_rst_irq); } static const struct dw_pcie_ops tegra_dw_pcie_ops = { .link_up = tegra_pcie_dw_link_up, .start_link = tegra_pcie_dw_start_link, .stop_link = tegra_pcie_dw_stop_link, }; static const struct dw_pcie_host_ops tegra_pcie_dw_host_ops = { .host_init = tegra_pcie_dw_host_init, }; static void tegra_pcie_disable_phy(struct tegra_pcie_dw *pcie) { unsigned int phy_count = pcie->phy_count; while (phy_count--) { phy_power_off(pcie->phys[phy_count]); phy_exit(pcie->phys[phy_count]); } } static int tegra_pcie_enable_phy(struct tegra_pcie_dw *pcie) { unsigned int i; int ret; for (i = 0; i < pcie->phy_count; i++) { ret = phy_init(pcie->phys[i]); if (ret < 0) goto phy_power_off; ret = phy_power_on(pcie->phys[i]); if (ret < 0) goto phy_exit; } return 0; phy_power_off: while (i--) { phy_power_off(pcie->phys[i]); phy_exit: phy_exit(pcie->phys[i]); } return ret; } static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie) { struct platform_device *pdev = to_platform_device(pcie->dev); struct device_node *np = pcie->dev->of_node; int ret; pcie->dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); if (!pcie->dbi_res) { dev_err(pcie->dev, "Failed to find \"dbi\" region\n"); return -ENODEV; } ret = of_property_read_u32(np, "nvidia,aspm-cmrt-us", &pcie->aspm_cmrt); if (ret < 0) { dev_info(pcie->dev, "Failed to read ASPM T_cmrt: %d\n", ret); return ret; } ret = of_property_read_u32(np, "nvidia,aspm-pwr-on-t-us", &pcie->aspm_pwr_on_t); if (ret < 0) dev_info(pcie->dev, "Failed to read ASPM Power On time: %d\n", ret); ret = of_property_read_u32(np, "nvidia,aspm-l0s-entrance-latency-us", &pcie->aspm_l0s_enter_lat); if (ret < 0) dev_info(pcie->dev, "Failed to read ASPM L0s Entrance latency: %d\n", ret); ret = of_property_read_u32(np, "num-lanes", &pcie->num_lanes); if (ret < 0) { dev_err(pcie->dev, "Failed to read num-lanes: %d\n", ret); return ret; } ret = of_property_read_u32_index(np, "nvidia,bpmp", 1, &pcie->cid); if (ret) { dev_err(pcie->dev, "Failed to read Controller-ID: %d\n", ret); return ret; } ret = of_property_count_strings(np, "phy-names"); if (ret < 0) { dev_err(pcie->dev, "Failed to find PHY entries: %d\n", ret); return ret; } pcie->phy_count = ret; if (of_property_read_bool(np, "nvidia,update-fc-fixup")) pcie->update_fc_fixup = true; /* RP using an external REFCLK is supported only in Tegra234 */ if (pcie->of_data->version == TEGRA194_DWC_IP_VER) { if (pcie->of_data->mode == DW_PCIE_EP_TYPE) pcie->enable_ext_refclk = true; } else { pcie->enable_ext_refclk = of_property_read_bool(pcie->dev->of_node, "nvidia,enable-ext-refclk"); } pcie->supports_clkreq = of_property_read_bool(pcie->dev->of_node, "supports-clkreq"); pcie->enable_cdm_check = of_property_read_bool(np, "snps,enable-cdm-check"); if (pcie->of_data->version == TEGRA234_DWC_IP_VER) pcie->enable_srns = of_property_read_bool(np, "nvidia,enable-srns"); if (pcie->of_data->mode == DW_PCIE_RC_TYPE) return 0; /* Endpoint mode specific DT entries */ pcie->pex_rst_gpiod = devm_gpiod_get(pcie->dev, "reset", GPIOD_IN); if (IS_ERR(pcie->pex_rst_gpiod)) { int err = PTR_ERR(pcie->pex_rst_gpiod); const char *level = KERN_ERR; if (err == -EPROBE_DEFER) level = KERN_DEBUG; dev_printk(level, pcie->dev, dev_fmt("Failed to get PERST GPIO: %d\n"), err); return err; } pcie->pex_refclk_sel_gpiod = devm_gpiod_get(pcie->dev, "nvidia,refclk-select", GPIOD_OUT_HIGH); if (IS_ERR(pcie->pex_refclk_sel_gpiod)) { int err = PTR_ERR(pcie->pex_refclk_sel_gpiod); const char *level = KERN_ERR; if (err == -EPROBE_DEFER) level = KERN_DEBUG; dev_printk(level, pcie->dev, dev_fmt("Failed to get REFCLK select GPIOs: %d\n"), err); pcie->pex_refclk_sel_gpiod = NULL; } return 0; } static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie, bool enable) { struct mrq_uphy_response resp; struct tegra_bpmp_message msg; struct mrq_uphy_request req; /* * Controller-5 doesn't need to have its state set by BPMP-FW in * Tegra194 */ if (pcie->of_data->version == TEGRA194_DWC_IP_VER && pcie->cid == 5) return 0; memset(&req, 0, sizeof(req)); memset(&resp, 0, sizeof(resp)); req.cmd = CMD_UPHY_PCIE_CONTROLLER_STATE; req.controller_state.pcie_controller = pcie->cid; req.controller_state.enable = enable; memset(&msg, 0, sizeof(msg)); msg.mrq = MRQ_UPHY; msg.tx.data = &req; msg.tx.size = sizeof(req); msg.rx.data = &resp; msg.rx.size = sizeof(resp); return tegra_bpmp_transfer(pcie->bpmp, &msg); } static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie, bool enable) { struct mrq_uphy_response resp; struct tegra_bpmp_message msg; struct mrq_uphy_request req; memset(&req, 0, sizeof(req)); memset(&resp, 0, sizeof(resp)); if (enable) { req.cmd = CMD_UPHY_PCIE_EP_CONTROLLER_PLL_INIT; req.ep_ctrlr_pll_init.ep_controller = pcie->cid; } else { req.cmd = CMD_UPHY_PCIE_EP_CONTROLLER_PLL_OFF; req.ep_ctrlr_pll_off.ep_controller = pcie->cid; } memset(&msg, 0, sizeof(msg)); msg.mrq = MRQ_UPHY; msg.tx.data = &req; msg.tx.size = sizeof(req); msg.rx.data = &resp; msg.rx.size = sizeof(resp); return tegra_bpmp_transfer(pcie->bpmp, &msg); } static void tegra_pcie_downstream_dev_to_D0(struct tegra_pcie_dw *pcie) { struct dw_pcie_rp *pp = &pcie->pci.pp; struct pci_bus *child, *root_bus = NULL; struct pci_dev *pdev; /* * link doesn't go into L2 state with some of the endpoints with Tegra * if they are not in D0 state. So, need to make sure that immediate * downstream devices are in D0 state before sending PME_TurnOff to put * link into L2 state. * This is as per PCI Express Base r4.0 v1.0 September 27-2017, * 5.2 Link State Power Management (Page #428). */ list_for_each_entry(child, &pp->bridge->bus->children, node) { /* Bring downstream devices to D0 if they are not already in */ if (child->parent == pp->bridge->bus) { root_bus = child; break; } } if (!root_bus) { dev_err(pcie->dev, "Failed to find downstream devices\n"); return; } list_for_each_entry(pdev, &root_bus->devices, bus_list) { if (PCI_SLOT(pdev->devfn) == 0) { if (pci_set_power_state(pdev, PCI_D0)) dev_err(pcie->dev, "Failed to transition %s to D0 state\n", dev_name(&pdev->dev)); } } } static int tegra_pcie_get_slot_regulators(struct tegra_pcie_dw *pcie) { pcie->slot_ctl_3v3 = devm_regulator_get_optional(pcie->dev, "vpcie3v3"); if (IS_ERR(pcie->slot_ctl_3v3)) { if (PTR_ERR(pcie->slot_ctl_3v3) != -ENODEV) return PTR_ERR(pcie->slot_ctl_3v3); pcie->slot_ctl_3v3 = NULL; } pcie->slot_ctl_12v = devm_regulator_get_optional(pcie->dev, "vpcie12v"); if (IS_ERR(pcie->slot_ctl_12v)) { if (PTR_ERR(pcie->slot_ctl_12v) != -ENODEV) return PTR_ERR(pcie->slot_ctl_12v); pcie->slot_ctl_12v = NULL; } return 0; } static int tegra_pcie_enable_slot_regulators(struct tegra_pcie_dw *pcie) { int ret; if (pcie->slot_ctl_3v3) { ret = regulator_enable(pcie->slot_ctl_3v3); if (ret < 0) { dev_err(pcie->dev, "Failed to enable 3.3V slot supply: %d\n", ret); return ret; } } if (pcie->slot_ctl_12v) { ret = regulator_enable(pcie->slot_ctl_12v); if (ret < 0) { dev_err(pcie->dev, "Failed to enable 12V slot supply: %d\n", ret); goto fail_12v_enable; } } /* * According to PCI Express Card Electromechanical Specification * Revision 1.1, Table-2.4, T_PVPERL (Power stable to PERST# inactive) * should be a minimum of 100ms. */ if (pcie->slot_ctl_3v3 || pcie->slot_ctl_12v) msleep(100); return 0; fail_12v_enable: if (pcie->slot_ctl_3v3) regulator_disable(pcie->slot_ctl_3v3); return ret; } static void tegra_pcie_disable_slot_regulators(struct tegra_pcie_dw *pcie) { if (pcie->slot_ctl_12v) regulator_disable(pcie->slot_ctl_12v); if (pcie->slot_ctl_3v3) regulator_disable(pcie->slot_ctl_3v3); } static int tegra_pcie_config_controller(struct tegra_pcie_dw *pcie, bool en_hw_hot_rst) { int ret; u32 val; ret = tegra_pcie_bpmp_set_ctrl_state(pcie, true); if (ret) { dev_err(pcie->dev, "Failed to enable controller %u: %d\n", pcie->cid, ret); return ret; } if (pcie->enable_ext_refclk) { ret = tegra_pcie_bpmp_set_pll_state(pcie, true); if (ret) { dev_err(pcie->dev, "Failed to init UPHY: %d\n", ret); goto fail_pll_init; } } ret = tegra_pcie_enable_slot_regulators(pcie); if (ret < 0) goto fail_slot_reg_en; ret = regulator_enable(pcie->pex_ctl_supply); if (ret < 0) { dev_err(pcie->dev, "Failed to enable regulator: %d\n", ret); goto fail_reg_en; } ret = clk_prepare_enable(pcie->core_clk); if (ret) { dev_err(pcie->dev, "Failed to enable core clock: %d\n", ret); goto fail_core_clk; } ret = reset_control_deassert(pcie->core_apb_rst); if (ret) { dev_err(pcie->dev, "Failed to deassert core APB reset: %d\n", ret); goto fail_core_apb_rst; } if (en_hw_hot_rst || pcie->of_data->has_sbr_reset_fix) { /* Enable HW_HOT_RST mode */ val = appl_readl(pcie, APPL_CTRL); val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << APPL_CTRL_HW_HOT_RST_MODE_SHIFT); val |= (APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST_LTSSM_EN << APPL_CTRL_HW_HOT_RST_MODE_SHIFT); val |= APPL_CTRL_HW_HOT_RST_EN; appl_writel(pcie, val, APPL_CTRL); } ret = tegra_pcie_enable_phy(pcie); if (ret) { dev_err(pcie->dev, "Failed to enable PHY: %d\n", ret); goto fail_phy; } /* Update CFG base address */ appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK, APPL_CFG_BASE_ADDR); /* Configure this core for RP mode operation */ appl_writel(pcie, APPL_DM_TYPE_RP, APPL_DM_TYPE); appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE); val = appl_readl(pcie, APPL_CTRL); appl_writel(pcie, val | APPL_CTRL_SYS_PRE_DET_STATE, APPL_CTRL); val = appl_readl(pcie, APPL_CFG_MISC); val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT); appl_writel(pcie, val, APPL_CFG_MISC); if (pcie->enable_srns || pcie->enable_ext_refclk) { /* * When Tegra PCIe RP is using external clock, it cannot supply * same clock to its downstream hierarchy. Hence, gate PCIe RP * REFCLK out pads when RP & EP are using separate clocks or RP * is using an external REFCLK. */ val = appl_readl(pcie, APPL_PINMUX); val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN; val &= ~APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE; appl_writel(pcie, val, APPL_PINMUX); } if (!pcie->supports_clkreq) { val = appl_readl(pcie, APPL_PINMUX); val |= APPL_PINMUX_CLKREQ_OVERRIDE_EN; val &= ~APPL_PINMUX_CLKREQ_OVERRIDE; appl_writel(pcie, val, APPL_PINMUX); } /* Update iATU_DMA base address */ appl_writel(pcie, pcie->atu_dma_res->start & APPL_CFG_IATU_DMA_BASE_ADDR_MASK, APPL_CFG_IATU_DMA_BASE_ADDR); reset_control_deassert(pcie->core_rst); return ret; fail_phy: reset_control_assert(pcie->core_apb_rst); fail_core_apb_rst: clk_disable_unprepare(pcie->core_clk); fail_core_clk: regulator_disable(pcie->pex_ctl_supply); fail_reg_en: tegra_pcie_disable_slot_regulators(pcie); fail_slot_reg_en: if (pcie->enable_ext_refclk) tegra_pcie_bpmp_set_pll_state(pcie, false); fail_pll_init: tegra_pcie_bpmp_set_ctrl_state(pcie, false); return ret; } static void tegra_pcie_unconfig_controller(struct tegra_pcie_dw *pcie) { int ret; ret = reset_control_assert(pcie->core_rst); if (ret) dev_err(pcie->dev, "Failed to assert \"core\" reset: %d\n", ret); tegra_pcie_disable_phy(pcie); ret = reset_control_assert(pcie->core_apb_rst); if (ret) dev_err(pcie->dev, "Failed to assert APB reset: %d\n", ret); clk_disable_unprepare(pcie->core_clk); ret = regulator_disable(pcie->pex_ctl_supply); if (ret) dev_err(pcie->dev, "Failed to disable regulator: %d\n", ret); tegra_pcie_disable_slot_regulators(pcie); if (pcie->enable_ext_refclk) { ret = tegra_pcie_bpmp_set_pll_state(pcie, false); if (ret) dev_err(pcie->dev, "Failed to deinit UPHY: %d\n", ret); } ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false); if (ret) dev_err(pcie->dev, "Failed to disable controller %d: %d\n", pcie->cid, ret); } static int tegra_pcie_init_controller(struct tegra_pcie_dw *pcie) { struct dw_pcie *pci = &pcie->pci; struct dw_pcie_rp *pp = &pci->pp; int ret; ret = tegra_pcie_config_controller(pcie, false); if (ret < 0) return ret; pp->ops = &tegra_pcie_dw_host_ops; ret = dw_pcie_host_init(pp); if (ret < 0) { dev_err(pcie->dev, "Failed to add PCIe port: %d\n", ret); goto fail_host_init; } return 0; fail_host_init: tegra_pcie_unconfig_controller(pcie); return ret; } static int tegra_pcie_try_link_l2(struct tegra_pcie_dw *pcie) { u32 val; if (!tegra_pcie_dw_link_up(&pcie->pci)) return 0; val = appl_readl(pcie, APPL_RADM_STATUS); val |= APPL_PM_XMT_TURNOFF_STATE; appl_writel(pcie, val, APPL_RADM_STATUS); return readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, val, val & APPL_DEBUG_PM_LINKST_IN_L2_LAT, 1, PME_ACK_TIMEOUT); } static void tegra_pcie_dw_pme_turnoff(struct tegra_pcie_dw *pcie) { u32 data; int err; if (!tegra_pcie_dw_link_up(&pcie->pci)) { dev_dbg(pcie->dev, "PCIe link is not up...!\n"); return; } /* * PCIe controller exits from L2 only if reset is applied, so * controller doesn't handle interrupts. But in cases where * L2 entry fails, PERST# is asserted which can trigger surprise * link down AER. However this function call happens in * suspend_noirq(), so AER interrupt will not be processed. * Disable all interrupts to avoid such a scenario. */ appl_writel(pcie, 0x0, APPL_INTR_EN_L0_0); if (tegra_pcie_try_link_l2(pcie)) { dev_info(pcie->dev, "Link didn't transition to L2 state\n"); /* * TX lane clock freq will reset to Gen1 only if link is in L2 * or detect state. * So apply pex_rst to end point to force RP to go into detect * state */ data = appl_readl(pcie, APPL_PINMUX); data &= ~APPL_PINMUX_PEX_RST; appl_writel(pcie, data, APPL_PINMUX); /* * Some cards do not go to detect state even after de-asserting * PERST#. So, de-assert LTSSM to bring link to detect state. */ data = readl(pcie->appl_base + APPL_CTRL); data &= ~APPL_CTRL_LTSSM_EN; writel(data, pcie->appl_base + APPL_CTRL); err = readl_poll_timeout_atomic(pcie->appl_base + APPL_DEBUG, data, ((data & APPL_DEBUG_LTSSM_STATE_MASK) >> APPL_DEBUG_LTSSM_STATE_SHIFT) == LTSSM_STATE_PRE_DETECT, 1, LTSSM_TIMEOUT); if (err) dev_info(pcie->dev, "Link didn't go to detect state\n"); } /* * DBI registers may not be accessible after this as PLL-E would be * down depending on how CLKREQ is pulled by end point */ data = appl_readl(pcie, APPL_PINMUX); data |= (APPL_PINMUX_CLKREQ_OVERRIDE_EN | APPL_PINMUX_CLKREQ_OVERRIDE); /* Cut REFCLK to slot */ data |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN; data &= ~APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE; appl_writel(pcie, data, APPL_PINMUX); } static void tegra_pcie_deinit_controller(struct tegra_pcie_dw *pcie) { tegra_pcie_downstream_dev_to_D0(pcie); dw_pcie_host_deinit(&pcie->pci.pp); tegra_pcie_dw_pme_turnoff(pcie); tegra_pcie_unconfig_controller(pcie); } static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie) { struct device *dev = pcie->dev; char *name; int ret; pm_runtime_enable(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) { dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", ret); goto fail_pm_get_sync; } ret = pinctrl_pm_select_default_state(dev); if (ret < 0) { dev_err(dev, "Failed to configure sideband pins: %d\n", ret); goto fail_pm_get_sync; } ret = tegra_pcie_init_controller(pcie); if (ret < 0) { dev_err(dev, "Failed to initialize controller: %d\n", ret); goto fail_pm_get_sync; } pcie->link_state = tegra_pcie_dw_link_up(&pcie->pci); if (!pcie->link_state) { ret = -ENOMEDIUM; goto fail_host_init; } name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node); if (!name) { ret = -ENOMEM; goto fail_host_init; } pcie->debugfs = debugfs_create_dir(name, NULL); init_debugfs(pcie); return ret; fail_host_init: tegra_pcie_deinit_controller(pcie); fail_pm_get_sync: pm_runtime_put_sync(dev); pm_runtime_disable(dev); return ret; } static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie) { u32 val; int ret; if (pcie->ep_state == EP_STATE_DISABLED) return; /* Disable LTSSM */ val = appl_readl(pcie, APPL_CTRL); val &= ~APPL_CTRL_LTSSM_EN; appl_writel(pcie, val, APPL_CTRL); ret = readl_poll_timeout(pcie->appl_base + APPL_DEBUG, val, ((val & APPL_DEBUG_LTSSM_STATE_MASK) >> APPL_DEBUG_LTSSM_STATE_SHIFT) == LTSSM_STATE_PRE_DETECT, 1, LTSSM_TIMEOUT); if (ret) dev_err(pcie->dev, "Failed to go Detect state: %d\n", ret); reset_control_assert(pcie->core_rst); tegra_pcie_disable_phy(pcie); reset_control_assert(pcie->core_apb_rst); clk_disable_unprepare(pcie->core_clk); pm_runtime_put_sync(pcie->dev); if (pcie->enable_ext_refclk) { ret = tegra_pcie_bpmp_set_pll_state(pcie, false); if (ret) dev_err(pcie->dev, "Failed to turn off UPHY: %d\n", ret); } ret = tegra_pcie_bpmp_set_pll_state(pcie, false); if (ret) dev_err(pcie->dev, "Failed to turn off UPHY: %d\n", ret); pcie->ep_state = EP_STATE_DISABLED; dev_dbg(pcie->dev, "Uninitialization of endpoint is completed\n"); } static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) { struct dw_pcie *pci = &pcie->pci; struct dw_pcie_ep *ep = &pci->ep; struct device *dev = pcie->dev; u32 val; int ret; u16 val_16; if (pcie->ep_state == EP_STATE_ENABLED) return; ret = pm_runtime_resume_and_get(dev); if (ret < 0) { dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", ret); return; } ret = tegra_pcie_bpmp_set_ctrl_state(pcie, true); if (ret) { dev_err(pcie->dev, "Failed to enable controller %u: %d\n", pcie->cid, ret); goto fail_set_ctrl_state; } if (pcie->enable_ext_refclk) { ret = tegra_pcie_bpmp_set_pll_state(pcie, true); if (ret) { dev_err(dev, "Failed to init UPHY for PCIe EP: %d\n", ret); goto fail_pll_init; } } ret = clk_prepare_enable(pcie->core_clk); if (ret) { dev_err(dev, "Failed to enable core clock: %d\n", ret); goto fail_core_clk_enable; } ret = reset_control_deassert(pcie->core_apb_rst); if (ret) { dev_err(dev, "Failed to deassert core APB reset: %d\n", ret); goto fail_core_apb_rst; } ret = tegra_pcie_enable_phy(pcie); if (ret) { dev_err(dev, "Failed to enable PHY: %d\n", ret); goto fail_phy; } /* Clear any stale interrupt statuses */ appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_0_0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_1); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_2); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_3); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_6); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_7); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_8_0); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_9); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_10); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_11); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_13); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_14); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_15); appl_writel(pcie, 0xFFFFFFFF, APPL_INTR_STATUS_L1_17); /* configure this core for EP mode operation */ val = appl_readl(pcie, APPL_DM_TYPE); val &= ~APPL_DM_TYPE_MASK; val |= APPL_DM_TYPE_EP; appl_writel(pcie, val, APPL_DM_TYPE); appl_writel(pcie, 0x0, APPL_CFG_SLCG_OVERRIDE); val = appl_readl(pcie, APPL_CTRL); val |= APPL_CTRL_SYS_PRE_DET_STATE; val |= APPL_CTRL_HW_HOT_RST_EN; appl_writel(pcie, val, APPL_CTRL); val = appl_readl(pcie, APPL_CFG_MISC); val |= APPL_CFG_MISC_SLV_EP_MODE; val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT); appl_writel(pcie, val, APPL_CFG_MISC); val = appl_readl(pcie, APPL_PINMUX); val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE_EN; val |= APPL_PINMUX_CLK_OUTPUT_IN_OVERRIDE; appl_writel(pcie, val, APPL_PINMUX); appl_writel(pcie, pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK, APPL_CFG_BASE_ADDR); appl_writel(pcie, pcie->atu_dma_res->start & APPL_CFG_IATU_DMA_BASE_ADDR_MASK, APPL_CFG_IATU_DMA_BASE_ADDR); val = appl_readl(pcie, APPL_INTR_EN_L0_0); val |= APPL_INTR_EN_L0_0_SYS_INTR_EN; val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN; val |= APPL_INTR_EN_L0_0_PCI_CMD_EN_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L0_0); val = appl_readl(pcie, APPL_INTR_EN_L1_0_0); val |= APPL_INTR_EN_L1_0_0_HOT_RESET_DONE_INT_EN; val |= APPL_INTR_EN_L1_0_0_RDLH_LINK_UP_INT_EN; appl_writel(pcie, val, APPL_INTR_EN_L1_0_0); reset_control_deassert(pcie->core_rst); if (pcie->update_fc_fixup) { val = dw_pcie_readl_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF); val |= 0x1 << CFG_TIMER_CTRL_ACK_NAK_SHIFT; dw_pcie_writel_dbi(pci, CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF, val); } config_gen3_gen4_eq_presets(pcie); init_host_aspm(pcie); /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */ if (!pcie->supports_clkreq) { disable_aspm_l11(pcie); disable_aspm_l12(pcie); } if (!pcie->of_data->has_l1ss_exit_fix) { val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); } pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci, PCI_CAP_ID_EXP); /* Clear Slot Clock Configuration bit if SRNS configuration */ if (pcie->enable_srns) { val_16 = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA); val_16 &= ~PCI_EXP_LNKSTA_SLC; dw_pcie_writew_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA, val_16); } clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ); val = (ep->msi_mem_phys & MSIX_ADDR_MATCH_LOW_OFF_MASK); val |= MSIX_ADDR_MATCH_LOW_OFF_EN; dw_pcie_writel_dbi(pci, MSIX_ADDR_MATCH_LOW_OFF, val); val = (upper_32_bits(ep->msi_mem_phys) & MSIX_ADDR_MATCH_HIGH_OFF_MASK); dw_pcie_writel_dbi(pci, MSIX_ADDR_MATCH_HIGH_OFF, val); ret = dw_pcie_ep_init_complete(ep); if (ret) { dev_err(dev, "Failed to complete initialization: %d\n", ret); goto fail_init_complete; } dw_pcie_ep_init_notify(ep); /* Program the private control to allow sending LTR upstream */ if (pcie->of_data->has_ltr_req_fix) { val = appl_readl(pcie, APPL_LTR_MSG_2); val |= APPL_LTR_MSG_2_LTR_MSG_REQ_STATE; appl_writel(pcie, val, APPL_LTR_MSG_2); } /* Enable LTSSM */ val = appl_readl(pcie, APPL_CTRL); val |= APPL_CTRL_LTSSM_EN; appl_writel(pcie, val, APPL_CTRL); pcie->ep_state = EP_STATE_ENABLED; dev_dbg(dev, "Initialization of endpoint is completed\n"); return; fail_init_complete: reset_control_assert(pcie->core_rst); tegra_pcie_disable_phy(pcie); fail_phy: reset_control_assert(pcie->core_apb_rst); fail_core_apb_rst: clk_disable_unprepare(pcie->core_clk); fail_core_clk_enable: tegra_pcie_bpmp_set_pll_state(pcie, false); fail_pll_init: tegra_pcie_bpmp_set_ctrl_state(pcie, false); fail_set_ctrl_state: pm_runtime_put_sync(dev); } static irqreturn_t tegra_pcie_ep_pex_rst_irq(int irq, void *arg) { struct tegra_pcie_dw *pcie = arg; if (gpiod_get_value(pcie->pex_rst_gpiod)) pex_ep_event_pex_rst_assert(pcie); else pex_ep_event_pex_rst_deassert(pcie); return IRQ_HANDLED; } static int tegra_pcie_ep_raise_legacy_irq(struct tegra_pcie_dw *pcie, u16 irq) { /* Tegra194 supports only INTA */ if (irq > 1) return -EINVAL; appl_writel(pcie, 1, APPL_LEGACY_INTX); usleep_range(1000, 2000); appl_writel(pcie, 0, APPL_LEGACY_INTX); return 0; } static int tegra_pcie_ep_raise_msi_irq(struct tegra_pcie_dw *pcie, u16 irq) { if (unlikely(irq > 31)) return -EINVAL; appl_writel(pcie, BIT(irq), APPL_MSI_CTRL_1); return 0; } static int tegra_pcie_ep_raise_msix_irq(struct tegra_pcie_dw *pcie, u16 irq) { struct dw_pcie_ep *ep = &pcie->pci.ep; writel(irq, ep->msi_mem); return 0; } static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, enum pci_epc_irq_type type, u16 interrupt_num) { struct dw_pcie *pci = to_dw_pcie_from_ep(ep); struct tegra_pcie_dw *pcie = to_tegra_pcie(pci); switch (type) { case PCI_EPC_IRQ_LEGACY: return tegra_pcie_ep_raise_legacy_irq(pcie, interrupt_num); case PCI_EPC_IRQ_MSI: return tegra_pcie_ep_raise_msi_irq(pcie, interrupt_num); case PCI_EPC_IRQ_MSIX: return tegra_pcie_ep_raise_msix_irq(pcie, interrupt_num); default: dev_err(pci->dev, "Unknown IRQ type\n"); return -EPERM; } return 0; } static const struct pci_epc_features tegra_pcie_epc_features = { .linkup_notifier = true, .core_init_notifier = true, .msi_capable = false, .msix_capable = false, .reserved_bar = 1 << BAR_2 | 1 << BAR_3 | 1 << BAR_4 | 1 << BAR_5, .bar_fixed_64bit = 1 << BAR_0, .bar_fixed_size[0] = SZ_1M, }; static const struct pci_epc_features* tegra_pcie_ep_get_features(struct dw_pcie_ep *ep) { return &tegra_pcie_epc_features; } static const struct dw_pcie_ep_ops pcie_ep_ops = { .raise_irq = tegra_pcie_ep_raise_irq, .get_features = tegra_pcie_ep_get_features, }; static int tegra_pcie_config_ep(struct tegra_pcie_dw *pcie, struct platform_device *pdev) { struct dw_pcie *pci = &pcie->pci; struct device *dev = pcie->dev; struct dw_pcie_ep *ep; char *name; int ret; ep = &pci->ep; ep->ops = &pcie_ep_ops; ep->page_size = SZ_64K; ret = gpiod_set_debounce(pcie->pex_rst_gpiod, PERST_DEBOUNCE_TIME); if (ret < 0) { dev_err(dev, "Failed to set PERST GPIO debounce time: %d\n", ret); return ret; } ret = gpiod_to_irq(pcie->pex_rst_gpiod); if (ret < 0) { dev_err(dev, "Failed to get IRQ for PERST GPIO: %d\n", ret); return ret; } pcie->pex_rst_irq = (unsigned int)ret; name = devm_kasprintf(dev, GFP_KERNEL, "tegra_pcie_%u_pex_rst_irq", pcie->cid); if (!name) { dev_err(dev, "Failed to create PERST IRQ string\n"); return -ENOMEM; } irq_set_status_flags(pcie->pex_rst_irq, IRQ_NOAUTOEN); pcie->ep_state = EP_STATE_DISABLED; ret = devm_request_threaded_irq(dev, pcie->pex_rst_irq, NULL, tegra_pcie_ep_pex_rst_irq, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, name, (void *)pcie); if (ret < 0) { dev_err(dev, "Failed to request IRQ for PERST: %d\n", ret); return ret; } pm_runtime_enable(dev); ret = dw_pcie_ep_init(ep); if (ret) { dev_err(dev, "Failed to initialize DWC Endpoint subsystem: %d\n", ret); pm_runtime_disable(dev); return ret; } return 0; } static int tegra_pcie_dw_probe(struct platform_device *pdev) { const struct tegra_pcie_dw_of_data *data; struct device *dev = &pdev->dev; struct resource *atu_dma_res; struct tegra_pcie_dw *pcie; struct dw_pcie_rp *pp; struct dw_pcie *pci; struct phy **phys; char *name; int ret; u32 i; data = of_device_get_match_data(dev); pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); if (!pcie) return -ENOMEM; pci = &pcie->pci; pci->dev = &pdev->dev; pci->ops = &tegra_dw_pcie_ops; pcie->dev = &pdev->dev; pcie->of_data = (struct tegra_pcie_dw_of_data *)data; pci->n_fts[0] = pcie->of_data->n_fts[0]; pci->n_fts[1] = pcie->of_data->n_fts[1]; pp = &pci->pp; pp->num_vectors = MAX_MSI_IRQS; ret = tegra_pcie_dw_parse_dt(pcie); if (ret < 0) { const char *level = KERN_ERR; if (ret == -EPROBE_DEFER) level = KERN_DEBUG; dev_printk(level, dev, dev_fmt("Failed to parse device tree: %d\n"), ret); return ret; } ret = tegra_pcie_get_slot_regulators(pcie); if (ret < 0) { const char *level = KERN_ERR; if (ret == -EPROBE_DEFER) level = KERN_DEBUG; dev_printk(level, dev, dev_fmt("Failed to get slot regulators: %d\n"), ret); return ret; } if (pcie->pex_refclk_sel_gpiod) gpiod_set_value(pcie->pex_refclk_sel_gpiod, 1); pcie->pex_ctl_supply = devm_regulator_get(dev, "vddio-pex-ctl"); if (IS_ERR(pcie->pex_ctl_supply)) { ret = PTR_ERR(pcie->pex_ctl_supply); if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get regulator: %ld\n", PTR_ERR(pcie->pex_ctl_supply)); return ret; } pcie->core_clk = devm_clk_get(dev, "core"); if (IS_ERR(pcie->core_clk)) { dev_err(dev, "Failed to get core clock: %ld\n", PTR_ERR(pcie->core_clk)); return PTR_ERR(pcie->core_clk); } pcie->appl_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "appl"); if (!pcie->appl_res) { dev_err(dev, "Failed to find \"appl\" region\n"); return -ENODEV; } pcie->appl_base = devm_ioremap_resource(dev, pcie->appl_res); if (IS_ERR(pcie->appl_base)) return PTR_ERR(pcie->appl_base); pcie->core_apb_rst = devm_reset_control_get(dev, "apb"); if (IS_ERR(pcie->core_apb_rst)) { dev_err(dev, "Failed to get APB reset: %ld\n", PTR_ERR(pcie->core_apb_rst)); return PTR_ERR(pcie->core_apb_rst); } phys = devm_kcalloc(dev, pcie->phy_count, sizeof(*phys), GFP_KERNEL); if (!phys) return -ENOMEM; for (i = 0; i < pcie->phy_count; i++) { name = kasprintf(GFP_KERNEL, "p2u-%u", i); if (!name) { dev_err(dev, "Failed to create P2U string\n"); return -ENOMEM; } phys[i] = devm_phy_get(dev, name); kfree(name); if (IS_ERR(phys[i])) { ret = PTR_ERR(phys[i]); if (ret != -EPROBE_DEFER) dev_err(dev, "Failed to get PHY: %d\n", ret); return ret; } } pcie->phys = phys; atu_dma_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu_dma"); if (!atu_dma_res) { dev_err(dev, "Failed to find \"atu_dma\" region\n"); return -ENODEV; } pcie->atu_dma_res = atu_dma_res; pci->atu_size = resource_size(atu_dma_res); pci->atu_base = devm_ioremap_resource(dev, atu_dma_res); if (IS_ERR(pci->atu_base)) return PTR_ERR(pci->atu_base); pcie->core_rst = devm_reset_control_get(dev, "core"); if (IS_ERR(pcie->core_rst)) { dev_err(dev, "Failed to get core reset: %ld\n", PTR_ERR(pcie->core_rst)); return PTR_ERR(pcie->core_rst); } pp->irq = platform_get_irq_byname(pdev, "intr"); if (pp->irq < 0) return pp->irq; pcie->bpmp = tegra_bpmp_get(dev); if (IS_ERR(pcie->bpmp)) return PTR_ERR(pcie->bpmp); platform_set_drvdata(pdev, pcie); pcie->icc_path = devm_of_icc_get(&pdev->dev, "write"); ret = PTR_ERR_OR_ZERO(pcie->icc_path); if (ret) { tegra_bpmp_put(pcie->bpmp); dev_err_probe(&pdev->dev, ret, "failed to get write interconnect\n"); return ret; } switch (pcie->of_data->mode) { case DW_PCIE_RC_TYPE: ret = devm_request_irq(dev, pp->irq, tegra_pcie_rp_irq_handler, IRQF_SHARED, "tegra-pcie-intr", pcie); if (ret) { dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq, ret); goto fail; } ret = tegra_pcie_config_rp(pcie); if (ret && ret != -ENOMEDIUM) goto fail; else return 0; break; case DW_PCIE_EP_TYPE: ret = devm_request_threaded_irq(dev, pp->irq, tegra_pcie_ep_hard_irq, tegra_pcie_ep_irq_thread, IRQF_SHARED | IRQF_ONESHOT, "tegra-pcie-ep-intr", pcie); if (ret) { dev_err(dev, "Failed to request IRQ %d: %d\n", pp->irq, ret); goto fail; } ret = tegra_pcie_config_ep(pcie, pdev); if (ret < 0) goto fail; break; default: dev_err(dev, "Invalid PCIe device type %d\n", pcie->of_data->mode); } fail: tegra_bpmp_put(pcie->bpmp); return ret; } static void tegra_pcie_dw_remove(struct platform_device *pdev) { struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev); if (pcie->of_data->mode == DW_PCIE_RC_TYPE) { if (!pcie->link_state) return; debugfs_remove_recursive(pcie->debugfs); tegra_pcie_deinit_controller(pcie); pm_runtime_put_sync(pcie->dev); } else { disable_irq(pcie->pex_rst_irq); pex_ep_event_pex_rst_assert(pcie); } pm_runtime_disable(pcie->dev); tegra_bpmp_put(pcie->bpmp); if (pcie->pex_refclk_sel_gpiod) gpiod_set_value(pcie->pex_refclk_sel_gpiod, 0); } static int tegra_pcie_dw_suspend_late(struct device *dev) { struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); u32 val; if (pcie->of_data->mode == DW_PCIE_EP_TYPE) { dev_err(dev, "Failed to Suspend as Tegra PCIe is in EP mode\n"); return -EPERM; } if (!pcie->link_state) return 0; /* Enable HW_HOT_RST mode */ if (!pcie->of_data->has_sbr_reset_fix) { val = appl_readl(pcie, APPL_CTRL); val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << APPL_CTRL_HW_HOT_RST_MODE_SHIFT); val |= APPL_CTRL_HW_HOT_RST_EN; appl_writel(pcie, val, APPL_CTRL); } return 0; } static int tegra_pcie_dw_suspend_noirq(struct device *dev) { struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); if (!pcie->link_state) return 0; tegra_pcie_downstream_dev_to_D0(pcie); tegra_pcie_dw_pme_turnoff(pcie); tegra_pcie_unconfig_controller(pcie); return 0; } static int tegra_pcie_dw_resume_noirq(struct device *dev) { struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); int ret; if (!pcie->link_state) return 0; ret = tegra_pcie_config_controller(pcie, true); if (ret < 0) return ret; ret = tegra_pcie_dw_host_init(&pcie->pci.pp); if (ret < 0) { dev_err(dev, "Failed to init host: %d\n", ret); goto fail_host_init; } dw_pcie_setup_rc(&pcie->pci.pp); ret = tegra_pcie_dw_start_link(&pcie->pci); if (ret < 0) goto fail_host_init; return 0; fail_host_init: tegra_pcie_unconfig_controller(pcie); return ret; } static int tegra_pcie_dw_resume_early(struct device *dev) { struct tegra_pcie_dw *pcie = dev_get_drvdata(dev); u32 val; if (pcie->of_data->mode == DW_PCIE_EP_TYPE) { dev_err(dev, "Suspend is not supported in EP mode"); return -ENOTSUPP; } if (!pcie->link_state) return 0; /* Disable HW_HOT_RST mode */ if (!pcie->of_data->has_sbr_reset_fix) { val = appl_readl(pcie, APPL_CTRL); val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK << APPL_CTRL_HW_HOT_RST_MODE_SHIFT); val |= APPL_CTRL_HW_HOT_RST_MODE_IMDT_RST << APPL_CTRL_HW_HOT_RST_MODE_SHIFT; val &= ~APPL_CTRL_HW_HOT_RST_EN; appl_writel(pcie, val, APPL_CTRL); } return 0; } static void tegra_pcie_dw_shutdown(struct platform_device *pdev) { struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev); if (pcie->of_data->mode == DW_PCIE_RC_TYPE) { if (!pcie->link_state) return; debugfs_remove_recursive(pcie->debugfs); tegra_pcie_downstream_dev_to_D0(pcie); disable_irq(pcie->pci.pp.irq); if (IS_ENABLED(CONFIG_PCI_MSI)) disable_irq(pcie->pci.pp.msi_irq[0]); tegra_pcie_dw_pme_turnoff(pcie); tegra_pcie_unconfig_controller(pcie); pm_runtime_put_sync(pcie->dev); } else { disable_irq(pcie->pex_rst_irq); pex_ep_event_pex_rst_assert(pcie); } } static const struct tegra_pcie_dw_of_data tegra194_pcie_dw_rc_of_data = { .version = TEGRA194_DWC_IP_VER, .mode = DW_PCIE_RC_TYPE, .cdm_chk_int_en_bit = BIT(19), /* Gen4 - 5, 6, 8 and 9 presets enabled */ .gen4_preset_vec = 0x360, .n_fts = { 52, 52 }, }; static const struct tegra_pcie_dw_of_data tegra194_pcie_dw_ep_of_data = { .version = TEGRA194_DWC_IP_VER, .mode = DW_PCIE_EP_TYPE, .cdm_chk_int_en_bit = BIT(19), /* Gen4 - 5, 6, 8 and 9 presets enabled */ .gen4_preset_vec = 0x360, .n_fts = { 52, 52 }, }; static const struct tegra_pcie_dw_of_data tegra234_pcie_dw_rc_of_data = { .version = TEGRA234_DWC_IP_VER, .mode = DW_PCIE_RC_TYPE, .has_msix_doorbell_access_fix = true, .has_sbr_reset_fix = true, .has_l1ss_exit_fix = true, .cdm_chk_int_en_bit = BIT(18), /* Gen4 - 6, 8 and 9 presets enabled */ .gen4_preset_vec = 0x340, .n_fts = { 52, 80 }, }; static const struct tegra_pcie_dw_of_data tegra234_pcie_dw_ep_of_data = { .version = TEGRA234_DWC_IP_VER, .mode = DW_PCIE_EP_TYPE, .has_l1ss_exit_fix = true, .has_ltr_req_fix = true, .cdm_chk_int_en_bit = BIT(18), /* Gen4 - 6, 8 and 9 presets enabled */ .gen4_preset_vec = 0x340, .n_fts = { 52, 80 }, }; static const struct of_device_id tegra_pcie_dw_of_match[] = { { .compatible = "nvidia,tegra194-pcie", .data = &tegra194_pcie_dw_rc_of_data, }, { .compatible = "nvidia,tegra194-pcie-ep", .data = &tegra194_pcie_dw_ep_of_data, }, { .compatible = "nvidia,tegra234-pcie", .data = &tegra234_pcie_dw_rc_of_data, }, { .compatible = "nvidia,tegra234-pcie-ep", .data = &tegra234_pcie_dw_ep_of_data, }, {} }; static const struct dev_pm_ops tegra_pcie_dw_pm_ops = { .suspend_late = tegra_pcie_dw_suspend_late, .suspend_noirq = tegra_pcie_dw_suspend_noirq, .resume_noirq = tegra_pcie_dw_resume_noirq, .resume_early = tegra_pcie_dw_resume_early, }; static struct platform_driver tegra_pcie_dw_driver = { .probe = tegra_pcie_dw_probe, .remove_new = tegra_pcie_dw_remove, .shutdown = tegra_pcie_dw_shutdown, .driver = { .name = "tegra194-pcie", .pm = &tegra_pcie_dw_pm_ops, .of_match_table = tegra_pcie_dw_of_match, }, }; module_platform_driver(tegra_pcie_dw_driver); MODULE_DEVICE_TABLE(of, tegra_pcie_dw_of_match); MODULE_AUTHOR("Vidya Sagar <vidyas@nvidia.com>"); MODULE_DESCRIPTION("NVIDIA PCIe host controller driver"); MODULE_LICENSE("GPL v2");
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