@@ -213,4 +213,15 @@ config PCIE_UNIPHIER
Say Y here if you want PCIe controller support on UniPhier SoCs.
This driver supports LD20 and PXs3 SoCs.
+config PCIE_TEGRA194
+ tristate "NVIDIA Tegra (T194) PCIe controller"
+ depends on TEGRA_BPMP && (ARCH_TEGRA || COMPILE_TEST)
+ depends on PCI_MSI_IRQ_DOMAIN
+ select PCIE_DW_HOST
+ select PHY_TEGRA194_PCIE_P2U
+ default m
+ help
+ Say Y here if you want support for DesignWare core based PCIe host
+ controller found in NVIDIA Tegra T194 SoC.
+
endmenu
@@ -16,6 +16,7 @@ obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
obj-$(CONFIG_PCI_MESON) += pci-meson.o
obj-$(CONFIG_PCIE_UNIPHIER) += pcie-uniphier.o
+obj-$(CONFIG_PCIE_TEGRA194) += pcie-tegra194.o
# The following drivers are for devices that use the generic ACPI
# pci_root.c driver but don't support standard ECAM config access.
new file mode 100644
@@ -0,0 +1,1760 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCIe host controller driver for Tegra T194 SoC
+ *
+ * Copyright (C) 2019 NVIDIA Corporation.
+ *
+ * Author: Vidya Sagar <vidyas@nvidia.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/kfifo.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/pci-aspm.h>
+#include <linux/phy/phy.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"
+#include "../../pcie/portdrv.h"
+
+#define dw_pcie_to_tegra_pcie(x) container_of(x, struct tegra_pcie_dw, pci)
+
+#define CTRL_5 5
+
+#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_PINMUX_CLKREQ_OUT_OVRD_EN BIT(9)
+#define APPL_PINMUX_CLKREQ_OUT_OVRD BIT(10)
+
+#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_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_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_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_STATUS_L1_0_0 0x20
+#define APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED BIT(1)
+
+#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_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_2 0xB0
+
+#define APPL_LTR_MSG_1 0xC4
+#define LTR_MSG_REQ BIT(15)
+#define LTR_MST_NO_SNOOP_SHIFT 16
+
+#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_LINK_CAP 0x7C
+
+#define CFG_DEV_STATUS_CONTROL 0x78
+#define CFG_DEV_STATUS_CONTROL_MPS_SHIFT 5
+
+#define CFG_LINK_CONTROL 0x80
+
+#define CFG_LINK_STATUS 0x82
+
+#define CFG_LINK_CONTROL_2 0xA0
+
+#define CFG_LINK_STATUS_2 0xA2
+#define CFG_LINK_STATUS_2_PCIE_CAP_EQ_CPL BIT(17)
+
+#define CFG_TIMER_CTRL_MAX_FUNC_NUM_OFF 0x718
+#define CFG_TIMER_CTRL_ACK_NAK_SHIFT (19)
+
+#define PCI_L1SS_CAP_CM_RTM_SHIFT 8 /* Common mode restore mask */
+#define PCI_L1SS_CAP_PWRN_VAL_SHIFT 19 /* T_POWER_ON val shift */
+
+#define EVENT_COUNTER_ALL_CLEAR 0x3
+#define EVENT_COUNTER_ENABLE_ALL 0x7
+#define EVENT_COUNTER_ENABLE_SHIFT 2
+#define EVENT_COUNTER_EVENT_SEL_MASK GENMASK(7, 0)
+#define EVENT_COUNTER_EVENT_SEL_SHIFT 16
+#define EVENT_COUNTER_EVENT_Tx_L0S 0x2
+#define EVENT_COUNTER_EVENT_Rx_L0S 0x3
+#define EVENT_COUNTER_EVENT_L1 0x5
+#define EVENT_COUNTER_EVENT_L1_1 0x7
+#define EVENT_COUNTER_EVENT_L1_2 0x8
+#define EVENT_COUNTER_GROUP_SEL_SHIFT 24
+#define EVENT_COUNTER_GROUP_5 0x5
+
+#define DL_FEATURE_EXCHANGE_EN BIT(31)
+
+#define PORT_LOGIC_ACK_F_ASPM_CTRL 0x70C
+#define ENTER_ASPM BIT(30)
+#define L0S_ENTRANCE_LAT_SHIFT 24
+#define L0S_ENTRANCE_LAT_MASK GENMASK(26, 24)
+#define L1_ENTRANCE_LAT_SHIFT 27
+#define L1_ENTRANCE_LAT_MASK GENMASK(29, 27)
+#define N_FTS_SHIFT 8
+#define N_FTS_MASK GENMASK(7, 0)
+#define N_FTS_VAL 52
+
+#define PORT_LOGIC_GEN2_CTRL 0x80C
+#define PORT_LOGIC_GEN2_CTRL_DIRECT_SPEED_CHANGE BIT(17)
+#define FTS_MASK GENMASK(7, 0)
+#define FTS_VAL 52
+
+#define PORT_LOGIC_MSI_CTRL_INT_0_EN 0x828
+
+#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 GEN3_RELATED_OFF 0x890
+#define GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL BIT(0)
+#define GEN3_RELATED_OFF_GEN3_EQ_DISABLE BIT(16)
+#define GEN3_RELATED_OFF_RATE_SHADOW_SEL_SHIFT 24
+#define GEN3_RELATED_OFF_RATE_SHADOW_SEL_MASK GENMASK(25, 24)
+
+#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 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 PL16G_CAP_OFF 0x188
+#define PL16G_CAP_OFF_DSP_16G_TX_PRESET_MASK GENMASK(3, 0)
+#define PL16G_CAP_OFF_USP_16G_TX_PRESET_MASK GENMASK(7, 4)
+#define PL16G_CAP_OFF_USP_16G_TX_PRESET_SHIFT 4
+
+#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
+
+static unsigned int pcie_gen_freq[] = {
+ GEN1_CORE_CLK_FREQ,
+ GEN2_CORE_CLK_FREQ,
+ GEN3_CORE_CLK_FREQ,
+ GEN4_CORE_CLK_FREQ
+};
+
+static u32 event_cntr_ctrl_offset[] = {
+ 0x1d8,
+ 0x1a8,
+ 0x1a8,
+ 0x1a8,
+ 0x1c4,
+ 0x1d8
+};
+
+static u32 event_cntr_data_offset[] = {
+ 0x1dc,
+ 0x1ac,
+ 0x1ac,
+ 0x1ac,
+ 0x1c8,
+ 0x1dc
+};
+
+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;
+ enum dw_pcie_device_mode mode;
+
+ bool supports_clkreq;
+ u8 init_link_width;
+ bool link_state;
+ u32 msi_ctrl_int;
+ u32 num_lanes;
+ u32 max_speed;
+ u32 init_speed;
+ u32 cid;
+ int pex_wake;
+ bool update_fc_fixup;
+ u32 cfg_link_cap_l1sub;
+ u32 aspm_cmrt;
+ u32 aspm_pwr_on_t;
+ u32 aspm_l0s_enter_lat;
+ u32 disabled_aspm_states;
+
+ struct regulator *pex_ctl_reg;
+
+ int phy_count;
+ struct phy **phy;
+
+ struct dentry *debugfs;
+};
+
+struct tegra_pcie_of_data {
+ enum dw_pcie_device_mode mode;
+};
+
+static void apply_bad_link_workaround(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct tegra_pcie_dw *pcie = dw_pcie_to_tegra_pcie(pci);
+ 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, CFG_LINK_STATUS);
+ if (val & PCI_EXP_LNKSTA_LBMS) {
+ if (pcie->init_link_width >
+ (val & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT) {
+ dev_warn(pci->dev, "PCIe link is bad, width reduced\n");
+ val = dw_pcie_readw_dbi(pci, CFG_LINK_CONTROL_2);
+ val &= ~PCI_EXP_LNKCTL2_TLS;
+ val |= PCI_EXP_LNKCTL2_TLS_2_5GT;
+ dw_pcie_writew_dbi(pci, CFG_LINK_CONTROL_2, val);
+
+ val = dw_pcie_readw_dbi(pci, CFG_LINK_CONTROL);
+ val |= PCI_EXP_LNKCTL_RL;
+ dw_pcie_writew_dbi(pci, CFG_LINK_CONTROL, val);
+ }
+ }
+}
+
+static irqreturn_t tegra_pcie_rp_irq_handler(struct tegra_pcie_dw *pcie)
+{
+ struct dw_pcie *pci = &pcie->pci;
+ struct pcie_port *pp = &pci->pp;
+ u32 val, tmp;
+ u16 val_w;
+
+ val = readl(pcie->appl_base + APPL_INTR_STATUS_L0);
+ dev_dbg(pci->dev, "APPL_INTR_STATUS_L0 = 0x%08X\n", val);
+ if (val & APPL_INTR_STATUS_L0_LINK_STATE_INT) {
+ val = readl(pcie->appl_base + APPL_INTR_STATUS_L1_0_0);
+ dev_dbg(pci->dev, "APPL_INTR_STATUS_L1_0_0 = 0x%08X\n", val);
+ if (val & APPL_INTR_STATUS_L1_0_0_LINK_REQ_RST_NOT_CHGED) {
+ writel(val, pcie->appl_base + APPL_INTR_STATUS_L1_0_0);
+
+ /* SBR & Surprise Link Down WAR */
+ val = readl(pcie->appl_base + APPL_CAR_RESET_OVRD);
+ val &= ~APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N;
+ writel(val, pcie->appl_base + APPL_CAR_RESET_OVRD);
+ udelay(1);
+ val = readl(pcie->appl_base + APPL_CAR_RESET_OVRD);
+ val |= APPL_CAR_RESET_OVRD_CYA_OVERRIDE_CORE_RST_N;
+ writel(val, pcie->appl_base + APPL_CAR_RESET_OVRD);
+
+ val = dw_pcie_readl_dbi(pci, PORT_LOGIC_GEN2_CTRL);
+ val |= PORT_LOGIC_GEN2_CTRL_DIRECT_SPEED_CHANGE;
+ dw_pcie_writel_dbi(pci, PORT_LOGIC_GEN2_CTRL, val);
+ }
+ }
+ if (val & APPL_INTR_STATUS_L0_INT_INT) {
+ val = readl(pcie->appl_base + APPL_INTR_STATUS_L1_8_0);
+ dev_dbg(pci->dev, "APPL_INTR_STATUS_L1_8_0 = 0x%08X\n", val);
+ if (val & APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS) {
+ writel(APPL_INTR_STATUS_L1_8_0_AUTO_BW_INT_STS,
+ pcie->appl_base + APPL_INTR_STATUS_L1_8_0);
+ apply_bad_link_workaround(pp);
+ }
+ if (val & APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS) {
+ writel(APPL_INTR_STATUS_L1_8_0_BW_MGT_INT_STS,
+ pcie->appl_base + APPL_INTR_STATUS_L1_8_0);
+
+ val_w = dw_pcie_readw_dbi(pci, CFG_LINK_STATUS);
+ dev_dbg(pci->dev, "Link Speed : Gen-%u\n", val_w &
+ PCI_EXP_LNKSTA_CLS);
+ }
+ }
+ val = readl(pcie->appl_base + APPL_INTR_STATUS_L0);
+ if (val & APPL_INTR_STATUS_L0_CDM_REG_CHK_INT) {
+ val = readl(pcie->appl_base + APPL_INTR_STATUS_L1_18);
+ tmp = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
+ dev_dbg(pci->dev, "APPL_INTR_STATUS_L1_18 = 0x%08X\n", val);
+ if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMPLT) {
+ dev_err(pci->dev, "CDM check complete\n");
+ tmp |= PCIE_PL_CHK_REG_CHK_REG_COMPLETE;
+ }
+ if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_CMP_ERR) {
+ dev_err(pci->dev, "CDM comparison mismatch\n");
+ tmp |= PCIE_PL_CHK_REG_CHK_REG_COMPARISON_ERROR;
+ }
+ if (val & APPL_INTR_STATUS_L1_18_CDM_REG_CHK_LOGIC_ERR) {
+ dev_err(pci->dev, "CDM Logic error\n");
+ tmp |= PCIE_PL_CHK_REG_CHK_REG_LOGIC_ERROR;
+ }
+ dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, tmp);
+ tmp = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_ERR_ADDR);
+ dev_err(pci->dev, "CDM Error Address Offset = 0x%08X\n", tmp);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t tegra_pcie_irq_handler(int irq, void *arg)
+{
+ struct tegra_pcie_dw *pcie = (struct tegra_pcie_dw *)arg;
+
+ if (pcie->mode == DW_PCIE_RC_TYPE)
+ return tegra_pcie_rp_irq_handler(pcie);
+
+ return IRQ_NONE;
+}
+
+static int tegra_pcie_dw_rd_own_conf(struct pcie_port *pp, int where, int size,
+ u32 *val)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+ /*
+ * 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 (where == PORT_LOGIC_MSIX_DOORBELL) {
+ *val = 0x00000000;
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ return dw_pcie_read(pci->dbi_base + where, size, val);
+}
+
+static int tegra_pcie_dw_wr_own_conf(struct pcie_port *pp, int where, int size,
+ u32 val)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+ /*
+ * 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 (where == PORT_LOGIC_MSIX_DOORBELL)
+ return PCIBIOS_SUCCESSFUL;
+
+ return dw_pcie_write(pci->dbi_base + where, size, val);
+}
+
+#if defined(CONFIG_PCIEASPM)
+static void disable_aspm_l0s(struct tegra_pcie_dw *pcie)
+{
+ u32 val;
+
+ val = dw_pcie_readl_dbi(&pcie->pci, CFG_LINK_CAP);
+ val &= ~(PCI_EXP_LNKCTL_ASPM_L0S << 10);
+ dw_pcie_writel_dbi(&pcie->pci, CFG_LINK_CAP, val);
+}
+
+static void disable_aspm_l10(struct tegra_pcie_dw *pcie)
+{
+ u32 val;
+
+ val = dw_pcie_readl_dbi(&pcie->pci, CFG_LINK_CAP);
+ val &= ~(PCI_EXP_LNKCTL_ASPM_L1 << 10);
+ dw_pcie_writel_dbi(&pcie->pci, CFG_LINK_CAP, val);
+}
+
+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, event_cntr_ctrl_offset[pcie->cid]);
+ 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, event_cntr_ctrl_offset[pcie->cid], val);
+ val = dw_pcie_readl_dbi(&pcie->pci, event_cntr_data_offset[pcie->cid]);
+ return val;
+}
+
+static int aspm_state_cnt(struct seq_file *s, void *data)
+{
+ struct tegra_pcie_dw *pcie = (struct tegra_pcie_dw *)(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, event_cntr_ctrl_offset[pcie->cid],
+ 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, event_cntr_ctrl_offset[pcie->cid], val);
+
+ return 0;
+}
+
+#define DEFINE_ENTRY(__name) \
+static int __name ## _open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, __name, inode->i_private); \
+} \
+static const struct file_operations __name ## _fops = { \
+ .open = __name ## _open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+}
+
+DEFINE_ENTRY(aspm_state_cnt);
+#endif
+
+static int init_debugfs(struct tegra_pcie_dw *pcie)
+{
+#if defined(CONFIG_PCIEASPM)
+ struct dentry *d;
+
+ d = debugfs_create_file("aspm_state_cnt", 0444, pcie->debugfs,
+ (void *)pcie, &aspm_state_cnt_fops);
+ if (!d)
+ dev_err(pcie->dev, "debugfs for aspm_state_cnt failed\n");
+#endif
+ return 0;
+}
+
+static void tegra_pcie_enable_system_interrupts(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct tegra_pcie_dw *pcie = dw_pcie_to_tegra_pcie(pci);
+ u32 val;
+ u16 val_w;
+
+ val = readl(pcie->appl_base + APPL_INTR_EN_L0_0);
+ val |= APPL_INTR_EN_L0_0_LINK_STATE_INT_EN;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L0_0);
+
+ val = readl(pcie->appl_base + APPL_INTR_EN_L1_0_0);
+ val |= APPL_INTR_EN_L1_0_0_LINK_REQ_RST_NOT_INT_EN;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L1_0_0);
+
+ if (of_property_read_bool(pci->dev->of_node, "cdm-check")) {
+ val = readl(pcie->appl_base + APPL_INTR_EN_L0_0);
+ val |= APPL_INTR_EN_L0_0_CDM_REG_CHK_INT_EN;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L0_0);
+
+ val = readl(pcie->appl_base + 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;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L1_18);
+ }
+
+ val_w = dw_pcie_readw_dbi(&pcie->pci, CFG_LINK_STATUS);
+ pcie->init_link_width = (val_w & PCI_EXP_LNKSTA_NLW) >>
+ PCI_EXP_LNKSTA_NLW_SHIFT;
+
+ val_w = dw_pcie_readw_dbi(&pcie->pci, CFG_LINK_CONTROL);
+ val_w |= PCI_EXP_LNKCTL_LBMIE;
+ dw_pcie_writew_dbi(&pcie->pci, CFG_LINK_CONTROL, val_w);
+}
+
+static void tegra_pcie_enable_legacy_interrupts(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct tegra_pcie_dw *pcie = dw_pcie_to_tegra_pcie(pci);
+ u32 val;
+
+ /* Enable legacy interrupt generation */
+ val = readl(pcie->appl_base + APPL_INTR_EN_L0_0);
+ val |= APPL_INTR_EN_L0_0_SYS_INTR_EN;
+ val |= APPL_INTR_EN_L0_0_INT_INT_EN;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L0_0);
+
+ val = readl(pcie->appl_base + 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;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L1_8_0);
+}
+
+static void tegra_pcie_enable_msi_interrupts(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct tegra_pcie_dw *pcie = dw_pcie_to_tegra_pcie(pci);
+ u32 val;
+
+ dw_pcie_msi_init(pp);
+
+ /* Enable MSI interrupt generation */
+ val = readl(pcie->appl_base + 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;
+ writel(val, pcie->appl_base + APPL_INTR_EN_L0_0);
+}
+
+static void tegra_pcie_enable_interrupts(struct pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct tegra_pcie_dw *pcie = dw_pcie_to_tegra_pcie(pci);
+
+ /* Clear interrupt statuses before enabling interrupts */
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L0);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_0_0);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_1);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_2);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_3);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_6);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_7);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_8_0);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_9);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_10);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_11);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_13);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_14);
+ writel(0xFFFFFFFF, pcie->appl_base + APPL_INTR_STATUS_L1_15);
+ writel(0xFFFFFFFF, pcie->appl_base + 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;
+ int i;
+ u32 val, offset;
+
+ /* Program init preset */
+ for (i = 0; i < pcie->num_lanes; i++) {
+ dw_pcie_read(pci->dbi_base + CAP_SPCIE_CAP_OFF
+ + (i * 2), 2, &val);
+ 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_write(pci->dbi_base + CAP_SPCIE_CAP_OFF
+ + (i * 2), 2, val);
+
+ offset = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_PL) +
+ PCI_PL_16GT_LE_CTRL;
+ dw_pcie_read(pci->dbi_base + offset + i, 1, &val);
+ val &= ~PL16G_CAP_OFF_DSP_16G_TX_PRESET_MASK;
+ val |= GEN3_GEN4_EQ_PRESET_INIT;
+ val &= ~PL16G_CAP_OFF_USP_16G_TX_PRESET_MASK;
+ val |= (GEN3_GEN4_EQ_PRESET_INIT <<
+ PL16G_CAP_OFF_USP_16G_TX_PRESET_SHIFT);
+ dw_pcie_write(pci->dbi_base + offset + i, 1, 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 |= (0x360 << 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 pcie_port *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct tegra_pcie_dw *pcie = dw_pcie_to_tegra_pcie(pci);
+ int count;
+ u32 val, tmp, offset, speed;
+ u16 val_w;
+
+core_init:
+ count = 200;
+#if defined(CONFIG_PCIEASPM)
+ pcie->cfg_link_cap_l1sub =
+ dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_L1SS) +
+ PCI_L1SS_CAP;
+#endif
+ 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);
+
+ /* Configure FTS */
+ val = dw_pcie_readl_dbi(pci, PORT_LOGIC_ACK_F_ASPM_CTRL);
+ val &= ~(N_FTS_MASK << N_FTS_SHIFT);
+ val |= N_FTS_VAL << N_FTS_SHIFT;
+ dw_pcie_writel_dbi(pci, PORT_LOGIC_ACK_F_ASPM_CTRL, val);
+
+ val = dw_pcie_readl_dbi(pci, PORT_LOGIC_GEN2_CTRL);
+ val &= ~FTS_MASK;
+ val |= FTS_VAL;
+ dw_pcie_writel_dbi(pci, PORT_LOGIC_GEN2_CTRL, val);
+
+ /* 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);
+
+ /* Set MPS to 256 in DEV_CTL */
+ val = dw_pcie_readl_dbi(pci, CFG_DEV_STATUS_CONTROL);
+ val &= ~PCI_EXP_DEVCTL_PAYLOAD;
+ val |= (1 << CFG_DEV_STATUS_CONTROL_MPS_SHIFT);
+ dw_pcie_writel_dbi(pci, CFG_DEV_STATUS_CONTROL, val);
+
+ /* Configure Max Speed from DT */
+ if (pcie->max_speed && pcie->max_speed != -EINVAL) {
+ val = dw_pcie_readl_dbi(pci, CFG_LINK_CAP);
+ val &= ~PCI_EXP_LNKCAP_SLS;
+ val |= pcie->max_speed;
+ dw_pcie_writel_dbi(pci, CFG_LINK_CAP, val);
+ }
+
+ val = dw_pcie_readw_dbi(pci, CFG_LINK_CONTROL_2);
+ val &= ~PCI_EXP_LNKCTL2_TLS;
+ val |= pcie->init_speed;
+ dw_pcie_writew_dbi(pci, CFG_LINK_CONTROL_2, val);
+
+ /* Configure Max lane width from DT */
+ val = dw_pcie_readl_dbi(pci, CFG_LINK_CAP);
+ val &= ~PCI_EXP_LNKCAP_MLW;
+ val |= (pcie->num_lanes << PCI_EXP_LNKSTA_NLW_SHIFT);
+ dw_pcie_writel_dbi(pci, CFG_LINK_CAP, val);
+
+ config_gen3_gen4_eq_presets(pcie);
+
+#if defined(CONFIG_PCIEASPM)
+ /* 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, event_cntr_ctrl_offset[pcie->cid], 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 << PCI_L1SS_CAP_CM_RTM_SHIFT);
+ val |= (pcie->aspm_pwr_on_t << PCI_L1SS_CAP_PWRN_VAL_SHIFT);
+ dw_pcie_writel_dbi(pci, pcie->cfg_link_cap_l1sub, val);
+
+ /* Program L0s and L1 entrance latencies */
+ val = dw_pcie_readl_dbi(pci, PORT_LOGIC_ACK_F_ASPM_CTRL);
+ val &= ~L0S_ENTRANCE_LAT_MASK;
+ val |= (pcie->aspm_l0s_enter_lat << L0S_ENTRANCE_LAT_SHIFT);
+ val |= ENTER_ASPM;
+ dw_pcie_writel_dbi(pci, PORT_LOGIC_ACK_F_ASPM_CTRL, val);
+
+ /* Program what ASPM states should get advertised */
+ if (pcie->disabled_aspm_states & 0x1)
+ disable_aspm_l0s(pcie); /* Disable L0s */
+ if (pcie->disabled_aspm_states & 0x2) {
+ disable_aspm_l10(pcie); /* Disable L1 */
+ disable_aspm_l11(pcie); /* Disable L1.1 */
+ disable_aspm_l12(pcie); /* Disable L1.2 */
+ }
+ if (pcie->disabled_aspm_states & 0x4)
+ disable_aspm_l11(pcie); /* Disable L1.1 */
+ if (pcie->disabled_aspm_states & 0x8)
+ disable_aspm_l12(pcie); /* Disable L1.2 */
+#endif
+ 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);
+ }
+
+ dw_pcie_setup_rc(pp);
+
+ clk_set_rate(pcie->core_clk, GEN4_CORE_CLK_FREQ);
+
+ /* Assert RST */
+ val = readl(pcie->appl_base + APPL_PINMUX);
+ val &= ~APPL_PINMUX_PEX_RST;
+ writel(val, pcie->appl_base + APPL_PINMUX);
+
+ usleep_range(100, 200);
+
+ /* Enable LTSSM */
+ val = readl(pcie->appl_base + APPL_CTRL);
+ val |= APPL_CTRL_LTSSM_EN;
+ writel(val, pcie->appl_base + APPL_CTRL);
+
+ /* De-assert RST */
+ val = readl(pcie->appl_base + APPL_PINMUX);
+ val |= APPL_PINMUX_PEX_RST;
+ writel(val, pcie->appl_base + APPL_PINMUX);
+
+ msleep(100);
+
+ val_w = dw_pcie_readw_dbi(pci, CFG_LINK_STATUS);
+ while (!(val_w & PCI_EXP_LNKSTA_DLLLA)) {
+ if (!count) {
+ val = readl(pcie->appl_base + APPL_DEBUG);
+ val &= APPL_DEBUG_LTSSM_STATE_MASK;
+ val >>= APPL_DEBUG_LTSSM_STATE_SHIFT;
+ tmp = readl(pcie->appl_base + APPL_LINK_STATUS);
+ tmp &= APPL_LINK_STATUS_RDLH_LINK_UP;
+ if (val == 0x11 && !tmp) {
+ dev_info(pci->dev, "Link is down in DLL");
+ dev_info(pci->dev,
+ "Trying again with DLFE disabled\n");
+ /* Disable LTSSM */
+ val = readl(pcie->appl_base + APPL_CTRL);
+ val &= ~APPL_CTRL_LTSSM_EN;
+ writel(val, pcie->appl_base + 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)
+ + PCI_DLF_CAP;
+ val = dw_pcie_readl_dbi(pci, offset);
+ val &= ~DL_FEATURE_EXCHANGE_EN;
+ dw_pcie_writel_dbi(pci, offset, val);
+
+ /* Retry now with DLF Exchange disabled */
+ goto core_init;
+ }
+ dev_info(pci->dev, "Link is down\n");
+ return 0;
+ }
+ dev_dbg(pci->dev, "Polling for link up\n");
+ usleep_range(1000, 2000);
+ val_w = dw_pcie_readw_dbi(pci, CFG_LINK_STATUS);
+ count--;
+ }
+ dev_info(pci->dev, "Link is up\n");
+
+ speed = (dw_pcie_readw_dbi(pci, CFG_LINK_STATUS) & PCI_EXP_LNKSTA_CLS);
+ clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
+
+ tegra_pcie_enable_interrupts(pp);
+
+ return 0;
+}
+
+static int tegra_pcie_dw_link_up(struct dw_pcie *pci)
+{
+ u32 val = dw_pcie_readw_dbi(pci, CFG_LINK_STATUS);
+
+ return !!(val & PCI_EXP_LNKSTA_DLLLA);
+}
+
+static void tegra_pcie_set_msi_vec_num(struct pcie_port *pp)
+{
+ pp->num_vectors = MAX_MSI_IRQS;
+}
+
+static const struct dw_pcie_ops tegra_dw_pcie_ops = {
+ .link_up = tegra_pcie_dw_link_up,
+};
+
+static struct dw_pcie_host_ops tegra_pcie_dw_host_ops = {
+ .rd_own_conf = tegra_pcie_dw_rd_own_conf,
+ .wr_own_conf = tegra_pcie_dw_wr_own_conf,
+ .host_init = tegra_pcie_dw_host_init,
+ .set_num_vectors = tegra_pcie_set_msi_vec_num,
+};
+
+static void tegra_pcie_disable_phy(struct tegra_pcie_dw *pcie)
+{
+ int phy_count = pcie->phy_count;
+
+ while (phy_count--) {
+ phy_power_off(pcie->phy[phy_count]);
+ phy_exit(pcie->phy[phy_count]);
+ }
+}
+
+static int tegra_pcie_enable_phy(struct tegra_pcie_dw *pcie)
+{
+ int phy_count = pcie->phy_count;
+ int ret;
+ int i;
+
+ for (i = 0; i < phy_count; i++) {
+ ret = phy_init(pcie->phy[i]);
+ if (ret < 0)
+ goto err_phy_init;
+
+ ret = phy_power_on(pcie->phy[i]);
+ if (ret < 0) {
+ phy_exit(pcie->phy[i]);
+ goto err_phy_power_on;
+ }
+ }
+
+ return 0;
+
+ while (i >= 0) {
+ phy_power_off(pcie->phy[i]);
+err_phy_power_on:
+ phy_exit(pcie->phy[i]);
+err_phy_init:
+ i--;
+ }
+
+ return ret;
+}
+
+static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
+{
+ struct device_node *np = pcie->dev->of_node;
+ int ret;
+
+ 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, "nvidia,disable-aspm-states",
+ &pcie->disabled_aspm_states);
+ if (ret < 0) {
+ dev_info(pcie->dev,
+ "Disabling advertisement of all ASPM states\n");
+ pcie->disabled_aspm_states = 0xF;
+ }
+
+ 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;
+ }
+
+ pcie->max_speed = of_pci_get_max_link_speed(np);
+
+ ret = of_property_read_u32(np, "nvidia,init-speed", &pcie->init_speed);
+ if (ret < 0 || (pcie->init_speed < 1 || pcie->init_speed > 4)) {
+ dev_dbg(pcie->dev, "Setting init speed to max speed\n");
+ pcie->init_speed = PCI_EXP_LNKCAP_SLS_16_0GB;
+ }
+
+ ret = of_property_read_u32(np, "nvidia,controller-id", &pcie->cid);
+ if (ret) {
+ dev_err(pcie->dev, "Controller-ID is missing in DT: %d\n", ret);
+ return ret;
+ }
+
+ pcie->phy_count = of_property_count_strings(np, "phy-names");
+ if (pcie->phy_count < 0) {
+ dev_err(pcie->dev, "Unable to find phy entries\n");
+ return pcie->phy_count;
+ }
+
+ if (of_property_read_bool(np, "nvidia,update-fc-fixup"))
+ pcie->update_fc_fixup = true;
+
+ pcie->pex_wake = of_get_named_gpio(np, "nvidia,pex-wake", 0);
+
+ pcie->supports_clkreq =
+ of_property_read_bool(pcie->dev->of_node, "supports-clkreq");
+
+ return 0;
+}
+
+static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
+{
+ struct pcie_port *pp = &pcie->pci.pp;
+ char *name;
+ int ret;
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ pp->msi_irq = of_irq_get_byname(pcie->dev->of_node, "msi");
+ if (!pp->msi_irq) {
+ dev_err(pcie->dev, "Failed to get MSI interrupt\n");
+ return -ENODEV;
+ }
+ }
+
+ pm_runtime_enable(pcie->dev);
+ ret = pm_runtime_get_sync(pcie->dev);
+ if (ret < 0) {
+ dev_err(pcie->dev, "Failed to get runtime sync for PCIe dev\n");
+ pm_runtime_disable(pcie->dev);
+ return ret;
+ }
+
+ pcie->link_state = tegra_pcie_dw_link_up(&pcie->pci);
+
+ if (!pcie->link_state) {
+ ret = -ENOMEDIUM;
+ goto fail_host_init;
+ }
+
+ name = kasprintf(GFP_KERNEL, "pcie@%x",
+ (uint32_t)pcie->appl_res->start);
+ if (!name) {
+ ret = -ENOMEM;
+ goto fail_host_init;
+ }
+
+ pcie->debugfs = debugfs_create_dir(name, NULL);
+ if (!pcie->debugfs)
+ dev_err(pcie->dev, "Debugfs creation failed\n");
+ else
+ init_debugfs(pcie);
+ kfree(name);
+
+ return ret;
+
+fail_host_init:
+ pm_runtime_put_sync(pcie->dev);
+ pm_runtime_disable(pcie->dev);
+ return ret;
+}
+
+static int tegra_pcie_config_pex_wake(struct tegra_pcie_dw *pcie)
+{
+ int ret;
+
+ ret = devm_gpio_request(pcie->dev, pcie->pex_wake, "pcie_wake");
+ if (ret < 0) {
+ if (ret == -EBUSY) {
+ dev_err(pcie->dev, "pex_wake already in use\n");
+ pcie->pex_wake = -EINVAL;
+ } else {
+ dev_err(pcie->dev, "pcie_wake gpio_request failed %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ if (pcie->pex_wake != -EINVAL) {
+ ret = gpio_direction_input(pcie->pex_wake);
+ if (ret < 0) {
+ dev_err(pcie->dev,
+ "Setting pcie_wake input direction failed %d\n",
+ ret);
+ return ret;
+ }
+ device_init_wakeup(pcie->dev, true);
+ }
+
+ return ret;
+}
+
+static const struct tegra_pcie_of_data tegra_pcie_rc_of_data = {
+ .mode = DW_PCIE_RC_TYPE,
+};
+
+static const struct of_device_id tegra_pcie_dw_of_match[] = {
+ {
+ .compatible = "nvidia,tegra194-pcie",
+ .data = &tegra_pcie_rc_of_data,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, tegra_pcie_dw_of_match);
+
+static int tegra_pcie_dw_probe(struct platform_device *pdev)
+{
+ struct tegra_pcie_dw *pcie;
+ struct pcie_port *pp;
+ struct dw_pcie *pci;
+ struct device *dev = &pdev->dev;
+ struct phy **phy;
+ struct resource *dbi_res;
+ struct resource *atu_dma_res;
+ const struct tegra_pcie_of_data *data;
+ char *name;
+ int ret, i;
+
+ 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;
+ pp = &pci->pp;
+ pcie->dev = &pdev->dev;
+
+ data = (struct tegra_pcie_of_data *)of_device_get_match_data(dev);
+ if (!data)
+ return -EINVAL;
+ pcie->mode = (enum dw_pcie_device_mode)data->mode;
+
+ ret = tegra_pcie_dw_parse_dt(pcie);
+ if (ret < 0) {
+ dev_err(pcie->dev, "Device tree parsing failed: %d\n", ret);
+ return ret;
+ }
+
+ if (gpio_is_valid(pcie->pex_wake))
+ tegra_pcie_config_pex_wake(pcie);
+
+ pcie->pex_ctl_reg = devm_regulator_get(dev, "vddio-pex-ctl");
+ if (IS_ERR(pcie->pex_ctl_reg)) {
+ dev_err(dev, "Failed to get regulator: %ld\n",
+ PTR_ERR(pcie->pex_ctl_reg));
+ return PTR_ERR(pcie->pex_ctl_reg);
+ }
+
+ pcie->core_clk = devm_clk_get(dev, "core");
+ if (IS_ERR(pcie->core_clk)) {
+ dev_err(dev, "Failed to get core clock\n");
+ return PTR_ERR(pcie->core_clk);
+ }
+
+ pcie->appl_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "appl");
+ if (!pcie->appl_res) {
+ dev_err(dev, "Missing appl space\n");
+ return PTR_ERR(pcie->appl_res);
+ }
+ pcie->appl_base = devm_ioremap_resource(dev, pcie->appl_res);
+ if (IS_ERR(pcie->appl_base)) {
+ dev_err(dev, "Mapping appl space failed\n");
+ return PTR_ERR(pcie->appl_base);
+ }
+
+ pcie->core_apb_rst = devm_reset_control_get(pcie->dev, "core_apb");
+ if (IS_ERR(pcie->core_apb_rst)) {
+ dev_err(pcie->dev, "core_apb reset is missing\n");
+ return PTR_ERR(pcie->core_apb_rst);
+ }
+
+ phy = devm_kcalloc(pcie->dev, pcie->phy_count, sizeof(*phy),
+ GFP_KERNEL);
+ if (!phy)
+ return PTR_ERR(phy);
+
+ for (i = 0; i < pcie->phy_count; i++) {
+ name = kasprintf(GFP_KERNEL, "p2u-%u", i);
+ if (!name) {
+ dev_err(pcie->dev, "Failed to create P2U string\n");
+ return -ENOMEM;
+ }
+ phy[i] = devm_phy_get(pcie->dev, name);
+ kfree(name);
+ if (IS_ERR(phy[i])) {
+ ret = PTR_ERR(phy[i]);
+ dev_err(pcie->dev, "phy_get error: %d\n", ret);
+ return ret;
+ }
+ }
+
+ pcie->phy = phy;
+
+ dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
+ if (!dbi_res) {
+ dev_err(dev, "Missing config space\n");
+ return PTR_ERR(dbi_res);
+ }
+ pcie->dbi_res = dbi_res;
+
+ pci->dbi_base = devm_ioremap_resource(dev, dbi_res);
+ if (IS_ERR(pci->dbi_base)) {
+ dev_err(dev, "Mapping dbi space failed\n");
+ return PTR_ERR(pci->dbi_base);
+ }
+
+ /* Tegra HW locates DBI2 at a fixed offset from DBI */
+ pci->dbi_base2 = pci->dbi_base + 0x1000;
+
+ atu_dma_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "atu_dma");
+ if (!atu_dma_res) {
+ dev_err(dev, "Missing atu_dma space\n");
+ return PTR_ERR(atu_dma_res);
+ }
+ pcie->atu_dma_res = atu_dma_res;
+ pci->atu_base = devm_ioremap_resource(dev, atu_dma_res);
+ if (IS_ERR(pci->atu_base)) {
+ dev_err(dev, "Mapping atu space failed\n");
+ return PTR_ERR(pci->atu_base);
+ }
+
+ pcie->core_rst = devm_reset_control_get(pcie->dev, "core");
+ if (IS_ERR(pcie->core_rst)) {
+ dev_err(pcie->dev, "core reset is missing\n");
+ return PTR_ERR(pcie->core_rst);
+ }
+
+ pp->irq = platform_get_irq_byname(pdev, "intr");
+ if (!pp->irq) {
+ dev_err(pcie->dev, "Failed to get intr interrupt\n");
+ return -ENODEV;
+ }
+
+ ret = devm_request_irq(dev, pp->irq, tegra_pcie_irq_handler,
+ IRQF_SHARED, "tegra-pcie-intr", pcie);
+ if (ret) {
+ dev_err(pcie->dev, "Failed to request IRQ %d\n", pp->irq);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, pcie);
+
+ if (pcie->mode == DW_PCIE_RC_TYPE) {
+ ret = tegra_pcie_config_rp(pcie);
+ if (ret == -ENOMEDIUM)
+ ret = 0;
+ }
+
+ 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 = readl(pcie->appl_base + APPL_RADM_STATUS);
+ val |= APPL_PM_XMT_TURNOFF_STATE;
+ writel(val, pcie->appl_base + 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_downstream_dev_to_D0(struct tegra_pcie_dw *pcie)
+{
+ struct pci_dev *pdev;
+ struct pci_bus *child;
+ struct pcie_port *pp = &pcie->pci.pp;
+
+ list_for_each_entry(child, &pp->root_bus->children, node) {
+ /* Bring downstream devices to D0 if they are not already in */
+ if (child->parent == pp->root_bus)
+ break;
+ }
+ list_for_each_entry(pdev, &child->devices, bus_list) {
+ if (PCI_FUNC(pdev->devfn) == 0) {
+ if (pci_set_power_state(pdev, PCI_D0))
+ dev_err(pcie->dev, "Transition to D0 failed\n");
+ }
+ }
+}
+
+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;
+ }
+
+ 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 = readl(pcie->appl_base + APPL_PINMUX);
+ data &= ~APPL_PINMUX_PEX_RST;
+ writel(data, pcie->appl_base + APPL_PINMUX);
+
+ 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");
+ } else {
+ /* Disable LTSSM after link is in detect state */
+ data = readl(pcie->appl_base + APPL_CTRL);
+ data &= ~APPL_CTRL_LTSSM_EN;
+ writel(data, pcie->appl_base + APPL_CTRL);
+ }
+ }
+ /*
+ * DBI registers may not be accessible after this as PLL-E would be
+ * down depending on how CLKREQ is pulled by end point
+ */
+ data = readl(pcie->appl_base + 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;
+ writel(data, pcie->appl_base + APPL_PINMUX);
+}
+
+static int tegra_pcie_dw_remove(struct platform_device *pdev)
+{
+ struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);
+
+ if (pcie->mode != DW_PCIE_RC_TYPE)
+ return 0;
+
+ if (!pcie->link_state)
+ return 0;
+
+ debugfs_remove_recursive(pcie->debugfs);
+ pm_runtime_put_sync(pcie->dev);
+ pm_runtime_disable(pcie->dev);
+
+ return 0;
+}
+
+static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
+ int enable)
+{
+ struct mrq_uphy_request req;
+ struct mrq_uphy_response resp;
+ struct tegra_bpmp_message msg;
+ struct tegra_bpmp *bpmp;
+ int err;
+
+ 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);
+
+ bpmp = tegra_bpmp_get(pcie->dev);
+ if (IS_ERR(bpmp))
+ return PTR_ERR(bpmp);
+
+ if (irqs_disabled())
+ err = tegra_bpmp_transfer_atomic(bpmp, &msg);
+ else
+ err = tegra_bpmp_transfer(bpmp, &msg);
+
+ tegra_bpmp_put(bpmp);
+
+ return err;
+}
+
+static int tegra_pcie_config_controller(struct tegra_pcie_dw *pcie,
+ bool en_hw_hot_rst)
+{
+ int ret;
+ u32 val;
+
+ if (pcie->cid != CTRL_5) {
+ ret = tegra_pcie_bpmp_set_ctrl_state(pcie, true);
+ if (ret) {
+ dev_err(pcie->dev, "Enabling controller-%d failed:%d\n",
+ pcie->cid, ret);
+ return ret;
+ }
+ }
+
+ ret = regulator_enable(pcie->pex_ctl_reg);
+ if (ret < 0) {
+ dev_err(pcie->dev, "Regulator enable failed: %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\n");
+ goto fail_core_clk;
+ }
+
+ reset_control_deassert(pcie->core_apb_rst);
+
+ if (en_hw_hot_rst) {
+ /* Enable HW_HOT_RST mode */
+ val = readl(pcie->appl_base + APPL_CTRL);
+ val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
+ APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
+ val |= APPL_CTRL_HW_HOT_RST_EN;
+ writel(val, pcie->appl_base + APPL_CTRL);
+ }
+
+ ret = tegra_pcie_enable_phy(pcie);
+ if (ret) {
+ dev_err(pcie->dev, "Failed to enable phy\n");
+ goto fail_phy;
+ }
+
+ /* Update CFG base address */
+ writel(pcie->dbi_res->start & APPL_CFG_BASE_ADDR_MASK,
+ pcie->appl_base + APPL_CFG_BASE_ADDR);
+
+ /* Configure this core for RP mode operation */
+ writel(APPL_DM_TYPE_RP, pcie->appl_base + APPL_DM_TYPE);
+
+ writel(0x0, pcie->appl_base + APPL_CFG_SLCG_OVERRIDE);
+
+ val = readl(pcie->appl_base + APPL_CTRL);
+ writel(val | APPL_CTRL_SYS_PRE_DET_STATE, pcie->appl_base + APPL_CTRL);
+
+ val = readl(pcie->appl_base + APPL_CFG_MISC);
+ val |= (APPL_CFG_MISC_ARCACHE_VAL << APPL_CFG_MISC_ARCACHE_SHIFT);
+ writel(val, pcie->appl_base + APPL_CFG_MISC);
+
+ if (!pcie->supports_clkreq) {
+ val = readl(pcie->appl_base + APPL_PINMUX);
+ val |= APPL_PINMUX_CLKREQ_OUT_OVRD_EN;
+ val |= APPL_PINMUX_CLKREQ_OUT_OVRD;
+ writel(val, pcie->appl_base + APPL_PINMUX);
+
+ /* Disable ASPM-L1SS adv as there is no CLKREQ routing */
+ disable_aspm_l11(pcie); /* Disable L1.1 */
+ disable_aspm_l12(pcie); /* Disable L1.2 */
+ }
+
+ /* Update iATU_DMA base address */
+ writel(pcie->atu_dma_res->start & APPL_CFG_IATU_DMA_BASE_ADDR_MASK,
+ pcie->appl_base + APPL_CFG_IATU_DMA_BASE_ADDR);
+
+ reset_control_deassert(pcie->core_rst);
+
+ return ret;
+
+fail_phy:
+ reset_control_assert(pcie->core_apb_rst);
+ clk_disable_unprepare(pcie->core_clk);
+fail_core_clk:
+ regulator_disable(pcie->pex_ctl_reg);
+fail_reg_en:
+ if (pcie->cid != CTRL_5)
+ tegra_pcie_bpmp_set_ctrl_state(pcie, false);
+
+ return ret;
+}
+
+static int tegra_pcie_dw_runtime_suspend(struct device *dev)
+{
+ struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
+
+ /*
+ * 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
+ */
+ tegra_pcie_downstream_dev_to_D0(pcie);
+ dw_pcie_host_deinit(&pcie->pci.pp);
+ tegra_pcie_dw_pme_turnoff(pcie);
+ reset_control_assert(pcie->core_rst);
+ tegra_pcie_disable_phy(pcie);
+ reset_control_assert(pcie->core_apb_rst);
+ clk_disable_unprepare(pcie->core_clk);
+ regulator_disable(pcie->pex_ctl_reg);
+
+ if (pcie->cid != CTRL_5)
+ tegra_pcie_bpmp_set_ctrl_state(pcie, false);
+
+ return 0;
+}
+
+static int tegra_pcie_dw_runtime_resume(struct device *dev)
+{
+ struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
+ struct dw_pcie *pci = &pcie->pci;
+ struct pcie_port *pp = &pci->pp;
+ int ret = 0;
+
+ ret = tegra_pcie_config_controller(pcie, false);
+ if (ret < 0)
+ return ret;
+
+ /* Program to use MPS of 256 wherever possible */
+ pcie_bus_config = PCIE_BUS_SAFE;
+
+ pp->root_bus_nr = -1;
+ pp->ops = &tegra_pcie_dw_host_ops;
+
+ /*
+ * Tegra doesn't support raising PME interrupts through MSI interrupt
+ * line. So, raising PME interrupts through MSI should be disabled
+ */
+ pcie_pme_disable_msi();
+
+ ret = dw_pcie_host_init(pp);
+ if (ret < 0) {
+ dev_err(pcie->dev, "Add PCIe port failed: %d\n", ret);
+ goto fail_host_init;
+ }
+
+ return 0;
+
+fail_host_init:
+ reset_control_assert(pcie->core_rst);
+ tegra_pcie_disable_phy(pcie);
+ reset_control_assert(pcie->core_apb_rst);
+ clk_disable_unprepare(pcie->core_clk);
+ regulator_disable(pcie->pex_ctl_reg);
+ if (pcie->cid != CTRL_5)
+ tegra_pcie_bpmp_set_ctrl_state(pcie, false);
+
+ return ret;
+}
+
+static int tegra_pcie_dw_suspend_late(struct device *dev)
+{
+ struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
+ u32 val;
+
+ if (!pcie->link_state)
+ return 0;
+
+ /* Enable HW_HOT_RST mode */
+ val = readl(pcie->appl_base + APPL_CTRL);
+ val &= ~(APPL_CTRL_HW_HOT_RST_MODE_MASK <<
+ APPL_CTRL_HW_HOT_RST_MODE_SHIFT);
+ val |= APPL_CTRL_HW_HOT_RST_EN;
+ writel(val, pcie->appl_base + APPL_CTRL);
+
+ return 0;
+}
+
+static int tegra_pcie_dw_suspend_noirq(struct device *dev)
+{
+ struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (!pcie->link_state)
+ return 0;
+
+ /* Save MSI interrupt vector */
+ pcie->msi_ctrl_int = dw_pcie_readl_dbi(&pcie->pci,
+ PORT_LOGIC_MSI_CTRL_INT_0_EN);
+ tegra_pcie_downstream_dev_to_D0(pcie);
+ tegra_pcie_dw_pme_turnoff(pcie);
+ reset_control_assert(pcie->core_rst);
+ tegra_pcie_disable_phy(pcie);
+ reset_control_assert(pcie->core_apb_rst);
+ clk_disable_unprepare(pcie->core_clk);
+ regulator_disable(pcie->pex_ctl_reg);
+ if (pcie->cid != CTRL_5) {
+ ret = tegra_pcie_bpmp_set_ctrl_state(pcie, false);
+ if (ret) {
+ dev_err(pcie->dev, "Disabling ctrl-%d failed:%d\n",
+ pcie->cid, ret);
+ return ret;
+ }
+ }
+ if (gpio_is_valid(pcie->pex_wake) && device_may_wakeup(dev)) {
+ ret = enable_irq_wake(gpio_to_irq(pcie->pex_wake));
+ if (ret < 0)
+ dev_err(dev, "Enable wake IRQ failed: %d\n", ret);
+ }
+
+ return ret;
+}
+
+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;
+
+ if (gpio_is_valid(pcie->pex_wake) && device_may_wakeup(dev)) {
+ ret = disable_irq_wake(gpio_to_irq(pcie->pex_wake));
+ if (ret < 0)
+ dev_err(dev, "Disable wake IRQ failed: %d\n", ret);
+ }
+
+ 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;
+ }
+
+ /* Restore MSI interrupt vector */
+ dw_pcie_writel_dbi(&pcie->pci, PORT_LOGIC_MSI_CTRL_INT_0_EN,
+ pcie->msi_ctrl_int);
+
+ return 0;
+fail_host_init:
+ reset_control_assert(pcie->core_rst);
+ tegra_pcie_disable_phy(pcie);
+ reset_control_assert(pcie->core_apb_rst);
+ clk_disable_unprepare(pcie->core_clk);
+ regulator_disable(pcie->pex_ctl_reg);
+ if (pcie->cid != CTRL_5)
+ tegra_pcie_bpmp_set_ctrl_state(pcie, false);
+
+ 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->link_state)
+ return 0;
+
+ /* Disable HW_HOT_RST mode */
+ val = readl(pcie->appl_base + 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;
+ writel(val, pcie->appl_base + 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->mode != DW_PCIE_RC_TYPE)
+ return;
+
+ 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);
+
+ tegra_pcie_dw_pme_turnoff(pcie);
+
+ reset_control_assert(pcie->core_rst);
+ tegra_pcie_disable_phy(pcie);
+ reset_control_assert(pcie->core_apb_rst);
+ clk_disable_unprepare(pcie->core_clk);
+ regulator_disable(pcie->pex_ctl_reg);
+ if (pcie->cid != CTRL_5)
+ tegra_pcie_bpmp_set_ctrl_state(pcie, false);
+}
+
+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,
+ .runtime_suspend = tegra_pcie_dw_runtime_suspend,
+ .runtime_resume = tegra_pcie_dw_runtime_resume,
+};
+
+static struct platform_driver tegra_pcie_dw_driver = {
+ .probe = tegra_pcie_dw_probe,
+ .remove = tegra_pcie_dw_remove,
+ .shutdown = tegra_pcie_dw_shutdown,
+ .driver = {
+ .name = "pcie-tegra",
+#ifdef CONFIG_PM
+ .pm = &tegra_pcie_dw_pm_ops,
+#endif
+ .of_match_table = tegra_pcie_dw_of_match,
+ },
+};
+module_platform_driver(tegra_pcie_dw_driver);
+
+MODULE_AUTHOR("Vidya Sagar <vidyas@nvidia.com>");
+MODULE_DESCRIPTION("NVIDIA PCIe host controller driver");
+MODULE_LICENSE("GPL v2");
Add support for Synopsys DesignWare core IP based PCIe host controller present in Tegra194 SoC. Signed-off-by: Vidya Sagar <vidyas@nvidia.com> --- Changes since [v1]: * Made CONFIG_PCIE_TEGRA194 as 'm' by default from its previous 'y' state * Modified code as per changes made to DT documentation * Refactored code to address Bjorn & Thierry's review comments * Added goto to avoid recursion in tegra_pcie_dw_host_init() API * Merged .scan_bus() of dw_pcie_host_ops implementation to tegra_pcie_dw_host_init() API drivers/pci/controller/dwc/Kconfig | 11 + drivers/pci/controller/dwc/Makefile | 1 + drivers/pci/controller/dwc/pcie-tegra194.c | 1760 ++++++++++++++++++++++++++++ 3 files changed, 1772 insertions(+) create mode 100644 drivers/pci/controller/dwc/pcie-tegra194.c