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path: root/drivers/pci/controller/pci-tegra.c
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-rw-r--r--drivers/pci/controller/pci-tegra.c2811
1 files changed, 2811 insertions, 0 deletions
diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
new file mode 100644
index 0000000000..038d974a31
--- /dev/null
+++ b/drivers/pci/controller/pci-tegra.c
@@ -0,0 +1,2811 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCIe host controller driver for Tegra SoCs
+ *
+ * Copyright (c) 2010, CompuLab, Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based on NVIDIA PCIe driver
+ * Copyright (c) 2008-2009, NVIDIA Corporation.
+ *
+ * Bits taken from arch/arm/mach-dove/pcie.c
+ *
+ * Author: Thierry Reding <treding@nvidia.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/debugfs.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/regulator/consumer.h>
+
+#include <soc/tegra/cpuidle.h>
+#include <soc/tegra/pmc.h>
+
+#include "../pci.h"
+
+#define INT_PCI_MSI_NR (8 * 32)
+
+/* register definitions */
+
+#define AFI_AXI_BAR0_SZ 0x00
+#define AFI_AXI_BAR1_SZ 0x04
+#define AFI_AXI_BAR2_SZ 0x08
+#define AFI_AXI_BAR3_SZ 0x0c
+#define AFI_AXI_BAR4_SZ 0x10
+#define AFI_AXI_BAR5_SZ 0x14
+
+#define AFI_AXI_BAR0_START 0x18
+#define AFI_AXI_BAR1_START 0x1c
+#define AFI_AXI_BAR2_START 0x20
+#define AFI_AXI_BAR3_START 0x24
+#define AFI_AXI_BAR4_START 0x28
+#define AFI_AXI_BAR5_START 0x2c
+
+#define AFI_FPCI_BAR0 0x30
+#define AFI_FPCI_BAR1 0x34
+#define AFI_FPCI_BAR2 0x38
+#define AFI_FPCI_BAR3 0x3c
+#define AFI_FPCI_BAR4 0x40
+#define AFI_FPCI_BAR5 0x44
+
+#define AFI_CACHE_BAR0_SZ 0x48
+#define AFI_CACHE_BAR0_ST 0x4c
+#define AFI_CACHE_BAR1_SZ 0x50
+#define AFI_CACHE_BAR1_ST 0x54
+
+#define AFI_MSI_BAR_SZ 0x60
+#define AFI_MSI_FPCI_BAR_ST 0x64
+#define AFI_MSI_AXI_BAR_ST 0x68
+
+#define AFI_MSI_VEC(x) (0x6c + ((x) * 4))
+#define AFI_MSI_EN_VEC(x) (0x8c + ((x) * 4))
+
+#define AFI_CONFIGURATION 0xac
+#define AFI_CONFIGURATION_EN_FPCI (1 << 0)
+#define AFI_CONFIGURATION_CLKEN_OVERRIDE (1 << 31)
+
+#define AFI_FPCI_ERROR_MASKS 0xb0
+
+#define AFI_INTR_MASK 0xb4
+#define AFI_INTR_MASK_INT_MASK (1 << 0)
+#define AFI_INTR_MASK_MSI_MASK (1 << 8)
+
+#define AFI_INTR_CODE 0xb8
+#define AFI_INTR_CODE_MASK 0xf
+#define AFI_INTR_INI_SLAVE_ERROR 1
+#define AFI_INTR_INI_DECODE_ERROR 2
+#define AFI_INTR_TARGET_ABORT 3
+#define AFI_INTR_MASTER_ABORT 4
+#define AFI_INTR_INVALID_WRITE 5
+#define AFI_INTR_LEGACY 6
+#define AFI_INTR_FPCI_DECODE_ERROR 7
+#define AFI_INTR_AXI_DECODE_ERROR 8
+#define AFI_INTR_FPCI_TIMEOUT 9
+#define AFI_INTR_PE_PRSNT_SENSE 10
+#define AFI_INTR_PE_CLKREQ_SENSE 11
+#define AFI_INTR_CLKCLAMP_SENSE 12
+#define AFI_INTR_RDY4PD_SENSE 13
+#define AFI_INTR_P2P_ERROR 14
+
+#define AFI_INTR_SIGNATURE 0xbc
+#define AFI_UPPER_FPCI_ADDRESS 0xc0
+#define AFI_SM_INTR_ENABLE 0xc4
+#define AFI_SM_INTR_INTA_ASSERT (1 << 0)
+#define AFI_SM_INTR_INTB_ASSERT (1 << 1)
+#define AFI_SM_INTR_INTC_ASSERT (1 << 2)
+#define AFI_SM_INTR_INTD_ASSERT (1 << 3)
+#define AFI_SM_INTR_INTA_DEASSERT (1 << 4)
+#define AFI_SM_INTR_INTB_DEASSERT (1 << 5)
+#define AFI_SM_INTR_INTC_DEASSERT (1 << 6)
+#define AFI_SM_INTR_INTD_DEASSERT (1 << 7)
+
+#define AFI_AFI_INTR_ENABLE 0xc8
+#define AFI_INTR_EN_INI_SLVERR (1 << 0)
+#define AFI_INTR_EN_INI_DECERR (1 << 1)
+#define AFI_INTR_EN_TGT_SLVERR (1 << 2)
+#define AFI_INTR_EN_TGT_DECERR (1 << 3)
+#define AFI_INTR_EN_TGT_WRERR (1 << 4)
+#define AFI_INTR_EN_DFPCI_DECERR (1 << 5)
+#define AFI_INTR_EN_AXI_DECERR (1 << 6)
+#define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7)
+#define AFI_INTR_EN_PRSNT_SENSE (1 << 8)
+
+#define AFI_PCIE_PME 0xf0
+
+#define AFI_PCIE_CONFIG 0x0f8
+#define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1))
+#define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1 (0x0 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_401 (0x0 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1 (0x1 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211 (0x1 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20)
+#define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111 (0x2 << 20)
+#define AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(x) (1 << ((x) + 29))
+#define AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO_ALL (0x7 << 29)
+
+#define AFI_FUSE 0x104
+#define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2)
+
+#define AFI_PEX0_CTRL 0x110
+#define AFI_PEX1_CTRL 0x118
+#define AFI_PEX_CTRL_RST (1 << 0)
+#define AFI_PEX_CTRL_CLKREQ_EN (1 << 1)
+#define AFI_PEX_CTRL_REFCLK_EN (1 << 3)
+#define AFI_PEX_CTRL_OVERRIDE_EN (1 << 4)
+
+#define AFI_PLLE_CONTROL 0x160
+#define AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
+#define AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
+
+#define AFI_PEXBIAS_CTRL_0 0x168
+
+#define RP_ECTL_2_R1 0x00000e84
+#define RP_ECTL_2_R1_RX_CTLE_1C_MASK 0xffff
+
+#define RP_ECTL_4_R1 0x00000e8c
+#define RP_ECTL_4_R1_RX_CDR_CTRL_1C_MASK (0xffff << 16)
+#define RP_ECTL_4_R1_RX_CDR_CTRL_1C_SHIFT 16
+
+#define RP_ECTL_5_R1 0x00000e90
+#define RP_ECTL_5_R1_RX_EQ_CTRL_L_1C_MASK 0xffffffff
+
+#define RP_ECTL_6_R1 0x00000e94
+#define RP_ECTL_6_R1_RX_EQ_CTRL_H_1C_MASK 0xffffffff
+
+#define RP_ECTL_2_R2 0x00000ea4
+#define RP_ECTL_2_R2_RX_CTLE_1C_MASK 0xffff
+
+#define RP_ECTL_4_R2 0x00000eac
+#define RP_ECTL_4_R2_RX_CDR_CTRL_1C_MASK (0xffff << 16)
+#define RP_ECTL_4_R2_RX_CDR_CTRL_1C_SHIFT 16
+
+#define RP_ECTL_5_R2 0x00000eb0
+#define RP_ECTL_5_R2_RX_EQ_CTRL_L_1C_MASK 0xffffffff
+
+#define RP_ECTL_6_R2 0x00000eb4
+#define RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK 0xffffffff
+
+#define RP_VEND_XP 0x00000f00
+#define RP_VEND_XP_DL_UP (1 << 30)
+#define RP_VEND_XP_OPPORTUNISTIC_ACK (1 << 27)
+#define RP_VEND_XP_OPPORTUNISTIC_UPDATEFC (1 << 28)
+#define RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK (0xff << 18)
+
+#define RP_VEND_CTL0 0x00000f44
+#define RP_VEND_CTL0_DSK_RST_PULSE_WIDTH_MASK (0xf << 12)
+#define RP_VEND_CTL0_DSK_RST_PULSE_WIDTH (0x9 << 12)
+
+#define RP_VEND_CTL1 0x00000f48
+#define RP_VEND_CTL1_ERPT (1 << 13)
+
+#define RP_VEND_XP_BIST 0x00000f4c
+#define RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE (1 << 28)
+
+#define RP_VEND_CTL2 0x00000fa8
+#define RP_VEND_CTL2_PCA_ENABLE (1 << 7)
+
+#define RP_PRIV_MISC 0x00000fe0
+#define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xe << 0)
+#define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xf << 0)
+#define RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD_MASK (0x7f << 16)
+#define RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD (0xf << 16)
+#define RP_PRIV_MISC_CTLR_CLK_CLAMP_ENABLE (1 << 23)
+#define RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD_MASK (0x7f << 24)
+#define RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD (0xf << 24)
+#define RP_PRIV_MISC_TMS_CLK_CLAMP_ENABLE (1 << 31)
+
+#define RP_LINK_CONTROL_STATUS 0x00000090
+#define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000
+#define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000
+
+#define RP_LINK_CONTROL_STATUS_2 0x000000b0
+
+#define PADS_CTL_SEL 0x0000009c
+
+#define PADS_CTL 0x000000a0
+#define PADS_CTL_IDDQ_1L (1 << 0)
+#define PADS_CTL_TX_DATA_EN_1L (1 << 6)
+#define PADS_CTL_RX_DATA_EN_1L (1 << 10)
+
+#define PADS_PLL_CTL_TEGRA20 0x000000b8
+#define PADS_PLL_CTL_TEGRA30 0x000000b4
+#define PADS_PLL_CTL_RST_B4SM (1 << 1)
+#define PADS_PLL_CTL_LOCKDET (1 << 8)
+#define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16)
+#define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16)
+#define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16)
+#define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16)
+#define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20)
+#define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20)
+#define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20)
+#define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22)
+
+#define PADS_REFCLK_CFG0 0x000000c8
+#define PADS_REFCLK_CFG1 0x000000cc
+#define PADS_REFCLK_BIAS 0x000000d0
+
+/*
+ * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
+ * entries, one entry per PCIe port. These field definitions and desired
+ * values aren't in the TRM, but do come from NVIDIA.
+ */
+#define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */
+#define PADS_REFCLK_CFG_E_TERM_SHIFT 7
+#define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */
+#define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */
+
+#define PME_ACK_TIMEOUT 10000
+#define LINK_RETRAIN_TIMEOUT 100000 /* in usec */
+
+struct tegra_msi {
+ DECLARE_BITMAP(used, INT_PCI_MSI_NR);
+ struct irq_domain *domain;
+ struct mutex map_lock;
+ spinlock_t mask_lock;
+ void *virt;
+ dma_addr_t phys;
+ int irq;
+};
+
+/* used to differentiate between Tegra SoC generations */
+struct tegra_pcie_port_soc {
+ struct {
+ u8 turnoff_bit;
+ u8 ack_bit;
+ } pme;
+};
+
+struct tegra_pcie_soc {
+ unsigned int num_ports;
+ const struct tegra_pcie_port_soc *ports;
+ unsigned int msi_base_shift;
+ unsigned long afi_pex2_ctrl;
+ u32 pads_pll_ctl;
+ u32 tx_ref_sel;
+ u32 pads_refclk_cfg0;
+ u32 pads_refclk_cfg1;
+ u32 update_fc_threshold;
+ bool has_pex_clkreq_en;
+ bool has_pex_bias_ctrl;
+ bool has_intr_prsnt_sense;
+ bool has_cml_clk;
+ bool has_gen2;
+ bool force_pca_enable;
+ bool program_uphy;
+ bool update_clamp_threshold;
+ bool program_deskew_time;
+ bool update_fc_timer;
+ bool has_cache_bars;
+ struct {
+ struct {
+ u32 rp_ectl_2_r1;
+ u32 rp_ectl_4_r1;
+ u32 rp_ectl_5_r1;
+ u32 rp_ectl_6_r1;
+ u32 rp_ectl_2_r2;
+ u32 rp_ectl_4_r2;
+ u32 rp_ectl_5_r2;
+ u32 rp_ectl_6_r2;
+ } regs;
+ bool enable;
+ } ectl;
+};
+
+struct tegra_pcie {
+ struct device *dev;
+
+ void __iomem *pads;
+ void __iomem *afi;
+ void __iomem *cfg;
+ int irq;
+
+ struct resource cs;
+
+ struct clk *pex_clk;
+ struct clk *afi_clk;
+ struct clk *pll_e;
+ struct clk *cml_clk;
+
+ struct reset_control *pex_rst;
+ struct reset_control *afi_rst;
+ struct reset_control *pcie_xrst;
+
+ bool legacy_phy;
+ struct phy *phy;
+
+ struct tegra_msi msi;
+
+ struct list_head ports;
+ u32 xbar_config;
+
+ struct regulator_bulk_data *supplies;
+ unsigned int num_supplies;
+
+ const struct tegra_pcie_soc *soc;
+ struct dentry *debugfs;
+};
+
+static inline struct tegra_pcie *msi_to_pcie(struct tegra_msi *msi)
+{
+ return container_of(msi, struct tegra_pcie, msi);
+}
+
+struct tegra_pcie_port {
+ struct tegra_pcie *pcie;
+ struct device_node *np;
+ struct list_head list;
+ struct resource regs;
+ void __iomem *base;
+ unsigned int index;
+ unsigned int lanes;
+
+ struct phy **phys;
+
+ struct gpio_desc *reset_gpio;
+};
+
+static inline void afi_writel(struct tegra_pcie *pcie, u32 value,
+ unsigned long offset)
+{
+ writel(value, pcie->afi + offset);
+}
+
+static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset)
+{
+ return readl(pcie->afi + offset);
+}
+
+static inline void pads_writel(struct tegra_pcie *pcie, u32 value,
+ unsigned long offset)
+{
+ writel(value, pcie->pads + offset);
+}
+
+static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
+{
+ return readl(pcie->pads + offset);
+}
+
+/*
+ * The configuration space mapping on Tegra is somewhat similar to the ECAM
+ * defined by PCIe. However it deviates a bit in how the 4 bits for extended
+ * register accesses are mapped:
+ *
+ * [27:24] extended register number
+ * [23:16] bus number
+ * [15:11] device number
+ * [10: 8] function number
+ * [ 7: 0] register number
+ *
+ * Mapping the whole extended configuration space would require 256 MiB of
+ * virtual address space, only a small part of which will actually be used.
+ *
+ * To work around this, a 4 KiB region is used to generate the required
+ * configuration transaction with relevant B:D:F and register offset values.
+ * This is achieved by dynamically programming base address and size of
+ * AFI_AXI_BAR used for end point config space mapping to make sure that the
+ * address (access to which generates correct config transaction) falls in
+ * this 4 KiB region.
+ */
+static unsigned int tegra_pcie_conf_offset(u8 bus, unsigned int devfn,
+ unsigned int where)
+{
+ return ((where & 0xf00) << 16) | (bus << 16) | (PCI_SLOT(devfn) << 11) |
+ (PCI_FUNC(devfn) << 8) | (where & 0xff);
+}
+
+static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
+ unsigned int devfn,
+ int where)
+{
+ struct tegra_pcie *pcie = bus->sysdata;
+ void __iomem *addr = NULL;
+
+ if (bus->number == 0) {
+ unsigned int slot = PCI_SLOT(devfn);
+ struct tegra_pcie_port *port;
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ if (port->index + 1 == slot) {
+ addr = port->base + (where & ~3);
+ break;
+ }
+ }
+ } else {
+ unsigned int offset;
+ u32 base;
+
+ offset = tegra_pcie_conf_offset(bus->number, devfn, where);
+
+ /* move 4 KiB window to offset within the FPCI region */
+ base = 0xfe100000 + ((offset & ~(SZ_4K - 1)) >> 8);
+ afi_writel(pcie, base, AFI_FPCI_BAR0);
+
+ /* move to correct offset within the 4 KiB page */
+ addr = pcie->cfg + (offset & (SZ_4K - 1));
+ }
+
+ return addr;
+}
+
+static int tegra_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *value)
+{
+ if (bus->number == 0)
+ return pci_generic_config_read32(bus, devfn, where, size,
+ value);
+
+ return pci_generic_config_read(bus, devfn, where, size, value);
+}
+
+static int tegra_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ if (bus->number == 0)
+ return pci_generic_config_write32(bus, devfn, where, size,
+ value);
+
+ return pci_generic_config_write(bus, devfn, where, size, value);
+}
+
+static struct pci_ops tegra_pcie_ops = {
+ .map_bus = tegra_pcie_map_bus,
+ .read = tegra_pcie_config_read,
+ .write = tegra_pcie_config_write,
+};
+
+static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
+{
+ const struct tegra_pcie_soc *soc = port->pcie->soc;
+ unsigned long ret = 0;
+
+ switch (port->index) {
+ case 0:
+ ret = AFI_PEX0_CTRL;
+ break;
+
+ case 1:
+ ret = AFI_PEX1_CTRL;
+ break;
+
+ case 2:
+ ret = soc->afi_pex2_ctrl;
+ break;
+ }
+
+ return ret;
+}
+
+static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
+{
+ unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
+ unsigned long value;
+
+ /* pulse reset signal */
+ if (port->reset_gpio) {
+ gpiod_set_value(port->reset_gpio, 1);
+ } else {
+ value = afi_readl(port->pcie, ctrl);
+ value &= ~AFI_PEX_CTRL_RST;
+ afi_writel(port->pcie, value, ctrl);
+ }
+
+ usleep_range(1000, 2000);
+
+ if (port->reset_gpio) {
+ gpiod_set_value(port->reset_gpio, 0);
+ } else {
+ value = afi_readl(port->pcie, ctrl);
+ value |= AFI_PEX_CTRL_RST;
+ afi_writel(port->pcie, value, ctrl);
+ }
+}
+
+static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port)
+{
+ const struct tegra_pcie_soc *soc = port->pcie->soc;
+ u32 value;
+
+ /* Enable AER capability */
+ value = readl(port->base + RP_VEND_CTL1);
+ value |= RP_VEND_CTL1_ERPT;
+ writel(value, port->base + RP_VEND_CTL1);
+
+ /* Optimal settings to enhance bandwidth */
+ value = readl(port->base + RP_VEND_XP);
+ value |= RP_VEND_XP_OPPORTUNISTIC_ACK;
+ value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC;
+ writel(value, port->base + RP_VEND_XP);
+
+ /*
+ * LTSSM will wait for DLLP to finish before entering L1 or L2,
+ * to avoid truncation of PM messages which results in receiver errors
+ */
+ value = readl(port->base + RP_VEND_XP_BIST);
+ value |= RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE;
+ writel(value, port->base + RP_VEND_XP_BIST);
+
+ value = readl(port->base + RP_PRIV_MISC);
+ value |= RP_PRIV_MISC_CTLR_CLK_CLAMP_ENABLE;
+ value |= RP_PRIV_MISC_TMS_CLK_CLAMP_ENABLE;
+
+ if (soc->update_clamp_threshold) {
+ value &= ~(RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD_MASK |
+ RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD_MASK);
+ value |= RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD |
+ RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD;
+ }
+
+ writel(value, port->base + RP_PRIV_MISC);
+}
+
+static void tegra_pcie_program_ectl_settings(struct tegra_pcie_port *port)
+{
+ const struct tegra_pcie_soc *soc = port->pcie->soc;
+ u32 value;
+
+ value = readl(port->base + RP_ECTL_2_R1);
+ value &= ~RP_ECTL_2_R1_RX_CTLE_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_2_r1;
+ writel(value, port->base + RP_ECTL_2_R1);
+
+ value = readl(port->base + RP_ECTL_4_R1);
+ value &= ~RP_ECTL_4_R1_RX_CDR_CTRL_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_4_r1 <<
+ RP_ECTL_4_R1_RX_CDR_CTRL_1C_SHIFT;
+ writel(value, port->base + RP_ECTL_4_R1);
+
+ value = readl(port->base + RP_ECTL_5_R1);
+ value &= ~RP_ECTL_5_R1_RX_EQ_CTRL_L_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_5_r1;
+ writel(value, port->base + RP_ECTL_5_R1);
+
+ value = readl(port->base + RP_ECTL_6_R1);
+ value &= ~RP_ECTL_6_R1_RX_EQ_CTRL_H_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_6_r1;
+ writel(value, port->base + RP_ECTL_6_R1);
+
+ value = readl(port->base + RP_ECTL_2_R2);
+ value &= ~RP_ECTL_2_R2_RX_CTLE_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_2_r2;
+ writel(value, port->base + RP_ECTL_2_R2);
+
+ value = readl(port->base + RP_ECTL_4_R2);
+ value &= ~RP_ECTL_4_R2_RX_CDR_CTRL_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_4_r2 <<
+ RP_ECTL_4_R2_RX_CDR_CTRL_1C_SHIFT;
+ writel(value, port->base + RP_ECTL_4_R2);
+
+ value = readl(port->base + RP_ECTL_5_R2);
+ value &= ~RP_ECTL_5_R2_RX_EQ_CTRL_L_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_5_r2;
+ writel(value, port->base + RP_ECTL_5_R2);
+
+ value = readl(port->base + RP_ECTL_6_R2);
+ value &= ~RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK;
+ value |= soc->ectl.regs.rp_ectl_6_r2;
+ writel(value, port->base + RP_ECTL_6_R2);
+}
+
+static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port)
+{
+ const struct tegra_pcie_soc *soc = port->pcie->soc;
+ u32 value;
+
+ /*
+ * Sometimes link speed change from Gen2 to Gen1 fails due to
+ * instability in deskew logic on lane-0. Increase the deskew
+ * retry time to resolve this issue.
+ */
+ if (soc->program_deskew_time) {
+ value = readl(port->base + RP_VEND_CTL0);
+ value &= ~RP_VEND_CTL0_DSK_RST_PULSE_WIDTH_MASK;
+ value |= RP_VEND_CTL0_DSK_RST_PULSE_WIDTH;
+ writel(value, port->base + RP_VEND_CTL0);
+ }
+
+ if (soc->update_fc_timer) {
+ value = readl(port->base + RP_VEND_XP);
+ value &= ~RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK;
+ value |= soc->update_fc_threshold;
+ writel(value, port->base + RP_VEND_XP);
+ }
+
+ /*
+ * PCIe link doesn't come up with few legacy PCIe endpoints if
+ * root port advertises both Gen-1 and Gen-2 speeds in Tegra.
+ * Hence, the strategy followed here is to initially advertise
+ * only Gen-1 and after link is up, retrain link to Gen-2 speed
+ */
+ value = readl(port->base + RP_LINK_CONTROL_STATUS_2);
+ value &= ~PCI_EXP_LNKSTA_CLS;
+ value |= PCI_EXP_LNKSTA_CLS_2_5GB;
+ writel(value, port->base + RP_LINK_CONTROL_STATUS_2);
+}
+
+static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
+{
+ unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
+ const struct tegra_pcie_soc *soc = port->pcie->soc;
+ unsigned long value;
+
+ /* enable reference clock */
+ value = afi_readl(port->pcie, ctrl);
+ value |= AFI_PEX_CTRL_REFCLK_EN;
+
+ if (soc->has_pex_clkreq_en)
+ value |= AFI_PEX_CTRL_CLKREQ_EN;
+
+ value |= AFI_PEX_CTRL_OVERRIDE_EN;
+
+ afi_writel(port->pcie, value, ctrl);
+
+ tegra_pcie_port_reset(port);
+
+ if (soc->force_pca_enable) {
+ value = readl(port->base + RP_VEND_CTL2);
+ value |= RP_VEND_CTL2_PCA_ENABLE;
+ writel(value, port->base + RP_VEND_CTL2);
+ }
+
+ tegra_pcie_enable_rp_features(port);
+
+ if (soc->ectl.enable)
+ tegra_pcie_program_ectl_settings(port);
+
+ tegra_pcie_apply_sw_fixup(port);
+}
+
+static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
+{
+ unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
+ const struct tegra_pcie_soc *soc = port->pcie->soc;
+ unsigned long value;
+
+ /* assert port reset */
+ value = afi_readl(port->pcie, ctrl);
+ value &= ~AFI_PEX_CTRL_RST;
+ afi_writel(port->pcie, value, ctrl);
+
+ /* disable reference clock */
+ value = afi_readl(port->pcie, ctrl);
+
+ if (soc->has_pex_clkreq_en)
+ value &= ~AFI_PEX_CTRL_CLKREQ_EN;
+
+ value &= ~AFI_PEX_CTRL_REFCLK_EN;
+ afi_writel(port->pcie, value, ctrl);
+
+ /* disable PCIe port and set CLKREQ# as GPIO to allow PLLE power down */
+ value = afi_readl(port->pcie, AFI_PCIE_CONFIG);
+ value |= AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
+ value |= AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(port->index);
+ afi_writel(port->pcie, value, AFI_PCIE_CONFIG);
+}
+
+static void tegra_pcie_port_free(struct tegra_pcie_port *port)
+{
+ struct tegra_pcie *pcie = port->pcie;
+ struct device *dev = pcie->dev;
+
+ devm_iounmap(dev, port->base);
+ devm_release_mem_region(dev, port->regs.start,
+ resource_size(&port->regs));
+ list_del(&port->list);
+ devm_kfree(dev, port);
+}
+
+/* Tegra PCIE root complex wrongly reports device class */
+static void tegra_pcie_fixup_class(struct pci_dev *dev)
+{
+ dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
+
+/* Tegra20 and Tegra30 PCIE requires relaxed ordering */
+static void tegra_pcie_relax_enable(struct pci_dev *dev)
+{
+ pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_relax_enable);
+
+static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
+{
+ struct tegra_pcie *pcie = pdev->bus->sysdata;
+ int irq;
+
+ tegra_cpuidle_pcie_irqs_in_use();
+
+ irq = of_irq_parse_and_map_pci(pdev, slot, pin);
+ if (!irq)
+ irq = pcie->irq;
+
+ return irq;
+}
+
+static irqreturn_t tegra_pcie_isr(int irq, void *arg)
+{
+ static const char * const err_msg[] = {
+ "Unknown",
+ "AXI slave error",
+ "AXI decode error",
+ "Target abort",
+ "Master abort",
+ "Invalid write",
+ "Legacy interrupt",
+ "Response decoding error",
+ "AXI response decoding error",
+ "Transaction timeout",
+ "Slot present pin change",
+ "Slot clock request change",
+ "TMS clock ramp change",
+ "TMS ready for power down",
+ "Peer2Peer error",
+ };
+ struct tegra_pcie *pcie = arg;
+ struct device *dev = pcie->dev;
+ u32 code, signature;
+
+ code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK;
+ signature = afi_readl(pcie, AFI_INTR_SIGNATURE);
+ afi_writel(pcie, 0, AFI_INTR_CODE);
+
+ if (code == AFI_INTR_LEGACY)
+ return IRQ_NONE;
+
+ if (code >= ARRAY_SIZE(err_msg))
+ code = 0;
+
+ /*
+ * do not pollute kernel log with master abort reports since they
+ * happen a lot during enumeration
+ */
+ if (code == AFI_INTR_MASTER_ABORT || code == AFI_INTR_PE_PRSNT_SENSE)
+ dev_dbg(dev, "%s, signature: %08x\n", err_msg[code], signature);
+ else
+ dev_err(dev, "%s, signature: %08x\n", err_msg[code], signature);
+
+ if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT ||
+ code == AFI_INTR_FPCI_DECODE_ERROR) {
+ u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff;
+ u64 address = (u64)fpci << 32 | (signature & 0xfffffffc);
+
+ if (code == AFI_INTR_MASTER_ABORT)
+ dev_dbg(dev, " FPCI address: %10llx\n", address);
+ else
+ dev_err(dev, " FPCI address: %10llx\n", address);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * FPCI map is as follows:
+ * - 0xfdfc000000: I/O space
+ * - 0xfdfe000000: type 0 configuration space
+ * - 0xfdff000000: type 1 configuration space
+ * - 0xfe00000000: type 0 extended configuration space
+ * - 0xfe10000000: type 1 extended configuration space
+ */
+static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
+{
+ u32 size;
+ struct resource_entry *entry;
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
+
+ /* Bar 0: type 1 extended configuration space */
+ size = resource_size(&pcie->cs);
+ afi_writel(pcie, pcie->cs.start, AFI_AXI_BAR0_START);
+ afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
+
+ resource_list_for_each_entry(entry, &bridge->windows) {
+ u32 fpci_bar, axi_address;
+ struct resource *res = entry->res;
+
+ size = resource_size(res);
+
+ switch (resource_type(res)) {
+ case IORESOURCE_IO:
+ /* Bar 1: downstream IO bar */
+ fpci_bar = 0xfdfc0000;
+ axi_address = pci_pio_to_address(res->start);
+ afi_writel(pcie, axi_address, AFI_AXI_BAR1_START);
+ afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
+ afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1);
+ break;
+ case IORESOURCE_MEM:
+ fpci_bar = (((res->start >> 12) & 0x0fffffff) << 4) | 0x1;
+ axi_address = res->start;
+
+ if (res->flags & IORESOURCE_PREFETCH) {
+ /* Bar 2: prefetchable memory BAR */
+ afi_writel(pcie, axi_address, AFI_AXI_BAR2_START);
+ afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
+ afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2);
+
+ } else {
+ /* Bar 3: non prefetchable memory BAR */
+ afi_writel(pcie, axi_address, AFI_AXI_BAR3_START);
+ afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
+ afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3);
+ }
+ break;
+ }
+ }
+
+ /* NULL out the remaining BARs as they are not used */
+ afi_writel(pcie, 0, AFI_AXI_BAR4_START);
+ afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
+ afi_writel(pcie, 0, AFI_FPCI_BAR4);
+
+ afi_writel(pcie, 0, AFI_AXI_BAR5_START);
+ afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
+ afi_writel(pcie, 0, AFI_FPCI_BAR5);
+
+ if (pcie->soc->has_cache_bars) {
+ /* map all upstream transactions as uncached */
+ afi_writel(pcie, 0, AFI_CACHE_BAR0_ST);
+ afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
+ afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
+ afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
+ }
+
+ /* MSI translations are setup only when needed */
+ afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
+ afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
+ afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
+ afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
+}
+
+static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ u32 value;
+
+ timeout = jiffies + msecs_to_jiffies(timeout);
+
+ while (time_before(jiffies, timeout)) {
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ if (value & PADS_PLL_CTL_LOCKDET)
+ return 0;
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ u32 value;
+ int err;
+
+ /* initialize internal PHY, enable up to 16 PCIE lanes */
+ pads_writel(pcie, 0x0, PADS_CTL_SEL);
+
+ /* override IDDQ to 1 on all 4 lanes */
+ value = pads_readl(pcie, PADS_CTL);
+ value |= PADS_CTL_IDDQ_1L;
+ pads_writel(pcie, value, PADS_CTL);
+
+ /*
+ * Set up PHY PLL inputs select PLLE output as refclock,
+ * set TX ref sel to div10 (not div5).
+ */
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
+ value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
+ pads_writel(pcie, value, soc->pads_pll_ctl);
+
+ /* reset PLL */
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ value &= ~PADS_PLL_CTL_RST_B4SM;
+ pads_writel(pcie, value, soc->pads_pll_ctl);
+
+ usleep_range(20, 100);
+
+ /* take PLL out of reset */
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ value |= PADS_PLL_CTL_RST_B4SM;
+ pads_writel(pcie, value, soc->pads_pll_ctl);
+
+ /* wait for the PLL to lock */
+ err = tegra_pcie_pll_wait(pcie, 500);
+ if (err < 0) {
+ dev_err(dev, "PLL failed to lock: %d\n", err);
+ return err;
+ }
+
+ /* turn off IDDQ override */
+ value = pads_readl(pcie, PADS_CTL);
+ value &= ~PADS_CTL_IDDQ_1L;
+ pads_writel(pcie, value, PADS_CTL);
+
+ /* enable TX/RX data */
+ value = pads_readl(pcie, PADS_CTL);
+ value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
+ pads_writel(pcie, value, PADS_CTL);
+
+ return 0;
+}
+
+static int tegra_pcie_phy_disable(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ u32 value;
+
+ /* disable TX/RX data */
+ value = pads_readl(pcie, PADS_CTL);
+ value &= ~(PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L);
+ pads_writel(pcie, value, PADS_CTL);
+
+ /* override IDDQ */
+ value = pads_readl(pcie, PADS_CTL);
+ value |= PADS_CTL_IDDQ_1L;
+ pads_writel(pcie, value, PADS_CTL);
+
+ /* reset PLL */
+ value = pads_readl(pcie, soc->pads_pll_ctl);
+ value &= ~PADS_PLL_CTL_RST_B4SM;
+ pads_writel(pcie, value, soc->pads_pll_ctl);
+
+ usleep_range(20, 100);
+
+ return 0;
+}
+
+static int tegra_pcie_port_phy_power_on(struct tegra_pcie_port *port)
+{
+ struct device *dev = port->pcie->dev;
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < port->lanes; i++) {
+ err = phy_power_on(port->phys[i]);
+ if (err < 0) {
+ dev_err(dev, "failed to power on PHY#%u: %d\n", i, err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int tegra_pcie_port_phy_power_off(struct tegra_pcie_port *port)
+{
+ struct device *dev = port->pcie->dev;
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < port->lanes; i++) {
+ err = phy_power_off(port->phys[i]);
+ if (err < 0) {
+ dev_err(dev, "failed to power off PHY#%u: %d\n", i,
+ err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct tegra_pcie_port *port;
+ int err;
+
+ if (pcie->legacy_phy) {
+ if (pcie->phy)
+ err = phy_power_on(pcie->phy);
+ else
+ err = tegra_pcie_phy_enable(pcie);
+
+ if (err < 0)
+ dev_err(dev, "failed to power on PHY: %d\n", err);
+
+ return err;
+ }
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ err = tegra_pcie_port_phy_power_on(port);
+ if (err < 0) {
+ dev_err(dev,
+ "failed to power on PCIe port %u PHY: %d\n",
+ port->index, err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int tegra_pcie_phy_power_off(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct tegra_pcie_port *port;
+ int err;
+
+ if (pcie->legacy_phy) {
+ if (pcie->phy)
+ err = phy_power_off(pcie->phy);
+ else
+ err = tegra_pcie_phy_disable(pcie);
+
+ if (err < 0)
+ dev_err(dev, "failed to power off PHY: %d\n", err);
+
+ return err;
+ }
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ err = tegra_pcie_port_phy_power_off(port);
+ if (err < 0) {
+ dev_err(dev,
+ "failed to power off PCIe port %u PHY: %d\n",
+ port->index, err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void tegra_pcie_enable_controller(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ struct tegra_pcie_port *port;
+ unsigned long value;
+
+ /* enable PLL power down */
+ if (pcie->phy) {
+ value = afi_readl(pcie, AFI_PLLE_CONTROL);
+ value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
+ value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
+ afi_writel(pcie, value, AFI_PLLE_CONTROL);
+ }
+
+ /* power down PCIe slot clock bias pad */
+ if (soc->has_pex_bias_ctrl)
+ afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
+
+ /* configure mode and disable all ports */
+ value = afi_readl(pcie, AFI_PCIE_CONFIG);
+ value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
+ value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config;
+ value |= AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO_ALL;
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
+ value &= ~AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(port->index);
+ }
+
+ afi_writel(pcie, value, AFI_PCIE_CONFIG);
+
+ if (soc->has_gen2) {
+ value = afi_readl(pcie, AFI_FUSE);
+ value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
+ afi_writel(pcie, value, AFI_FUSE);
+ } else {
+ value = afi_readl(pcie, AFI_FUSE);
+ value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
+ afi_writel(pcie, value, AFI_FUSE);
+ }
+
+ /* Disable AFI dynamic clock gating and enable PCIe */
+ value = afi_readl(pcie, AFI_CONFIGURATION);
+ value |= AFI_CONFIGURATION_EN_FPCI;
+ value |= AFI_CONFIGURATION_CLKEN_OVERRIDE;
+ afi_writel(pcie, value, AFI_CONFIGURATION);
+
+ value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR |
+ AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR |
+ AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR;
+
+ if (soc->has_intr_prsnt_sense)
+ value |= AFI_INTR_EN_PRSNT_SENSE;
+
+ afi_writel(pcie, value, AFI_AFI_INTR_ENABLE);
+ afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE);
+
+ /* don't enable MSI for now, only when needed */
+ afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK);
+
+ /* disable all exceptions */
+ afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
+}
+
+static void tegra_pcie_power_off(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ int err;
+
+ reset_control_assert(pcie->afi_rst);
+
+ clk_disable_unprepare(pcie->pll_e);
+ if (soc->has_cml_clk)
+ clk_disable_unprepare(pcie->cml_clk);
+ clk_disable_unprepare(pcie->afi_clk);
+
+ if (!dev->pm_domain)
+ tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
+
+ err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
+ if (err < 0)
+ dev_warn(dev, "failed to disable regulators: %d\n", err);
+}
+
+static int tegra_pcie_power_on(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ int err;
+
+ reset_control_assert(pcie->pcie_xrst);
+ reset_control_assert(pcie->afi_rst);
+ reset_control_assert(pcie->pex_rst);
+
+ if (!dev->pm_domain)
+ tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
+
+ /* enable regulators */
+ err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
+ if (err < 0)
+ dev_err(dev, "failed to enable regulators: %d\n", err);
+
+ if (!dev->pm_domain) {
+ err = tegra_powergate_power_on(TEGRA_POWERGATE_PCIE);
+ if (err) {
+ dev_err(dev, "failed to power ungate: %d\n", err);
+ goto regulator_disable;
+ }
+ err = tegra_powergate_remove_clamping(TEGRA_POWERGATE_PCIE);
+ if (err) {
+ dev_err(dev, "failed to remove clamp: %d\n", err);
+ goto powergate;
+ }
+ }
+
+ err = clk_prepare_enable(pcie->afi_clk);
+ if (err < 0) {
+ dev_err(dev, "failed to enable AFI clock: %d\n", err);
+ goto powergate;
+ }
+
+ if (soc->has_cml_clk) {
+ err = clk_prepare_enable(pcie->cml_clk);
+ if (err < 0) {
+ dev_err(dev, "failed to enable CML clock: %d\n", err);
+ goto disable_afi_clk;
+ }
+ }
+
+ err = clk_prepare_enable(pcie->pll_e);
+ if (err < 0) {
+ dev_err(dev, "failed to enable PLLE clock: %d\n", err);
+ goto disable_cml_clk;
+ }
+
+ reset_control_deassert(pcie->afi_rst);
+
+ return 0;
+
+disable_cml_clk:
+ if (soc->has_cml_clk)
+ clk_disable_unprepare(pcie->cml_clk);
+disable_afi_clk:
+ clk_disable_unprepare(pcie->afi_clk);
+powergate:
+ if (!dev->pm_domain)
+ tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
+regulator_disable:
+ regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
+
+ return err;
+}
+
+static void tegra_pcie_apply_pad_settings(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+
+ /* Configure the reference clock driver */
+ pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0);
+
+ if (soc->num_ports > 2)
+ pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1);
+}
+
+static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+
+ pcie->pex_clk = devm_clk_get(dev, "pex");
+ if (IS_ERR(pcie->pex_clk))
+ return PTR_ERR(pcie->pex_clk);
+
+ pcie->afi_clk = devm_clk_get(dev, "afi");
+ if (IS_ERR(pcie->afi_clk))
+ return PTR_ERR(pcie->afi_clk);
+
+ pcie->pll_e = devm_clk_get(dev, "pll_e");
+ if (IS_ERR(pcie->pll_e))
+ return PTR_ERR(pcie->pll_e);
+
+ if (soc->has_cml_clk) {
+ pcie->cml_clk = devm_clk_get(dev, "cml");
+ if (IS_ERR(pcie->cml_clk))
+ return PTR_ERR(pcie->cml_clk);
+ }
+
+ return 0;
+}
+
+static int tegra_pcie_resets_get(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+
+ pcie->pex_rst = devm_reset_control_get_exclusive(dev, "pex");
+ if (IS_ERR(pcie->pex_rst))
+ return PTR_ERR(pcie->pex_rst);
+
+ pcie->afi_rst = devm_reset_control_get_exclusive(dev, "afi");
+ if (IS_ERR(pcie->afi_rst))
+ return PTR_ERR(pcie->afi_rst);
+
+ pcie->pcie_xrst = devm_reset_control_get_exclusive(dev, "pcie_x");
+ if (IS_ERR(pcie->pcie_xrst))
+ return PTR_ERR(pcie->pcie_xrst);
+
+ return 0;
+}
+
+static int tegra_pcie_phys_get_legacy(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ int err;
+
+ pcie->phy = devm_phy_optional_get(dev, "pcie");
+ if (IS_ERR(pcie->phy)) {
+ err = PTR_ERR(pcie->phy);
+ dev_err(dev, "failed to get PHY: %d\n", err);
+ return err;
+ }
+
+ err = phy_init(pcie->phy);
+ if (err < 0) {
+ dev_err(dev, "failed to initialize PHY: %d\n", err);
+ return err;
+ }
+
+ pcie->legacy_phy = true;
+
+ return 0;
+}
+
+static struct phy *devm_of_phy_optional_get_index(struct device *dev,
+ struct device_node *np,
+ const char *consumer,
+ unsigned int index)
+{
+ struct phy *phy;
+ char *name;
+
+ name = kasprintf(GFP_KERNEL, "%s-%u", consumer, index);
+ if (!name)
+ return ERR_PTR(-ENOMEM);
+
+ phy = devm_of_phy_optional_get(dev, np, name);
+ kfree(name);
+
+ return phy;
+}
+
+static int tegra_pcie_port_get_phys(struct tegra_pcie_port *port)
+{
+ struct device *dev = port->pcie->dev;
+ struct phy *phy;
+ unsigned int i;
+ int err;
+
+ port->phys = devm_kcalloc(dev, sizeof(phy), port->lanes, GFP_KERNEL);
+ if (!port->phys)
+ return -ENOMEM;
+
+ for (i = 0; i < port->lanes; i++) {
+ phy = devm_of_phy_optional_get_index(dev, port->np, "pcie", i);
+ if (IS_ERR(phy)) {
+ dev_err(dev, "failed to get PHY#%u: %ld\n", i,
+ PTR_ERR(phy));
+ return PTR_ERR(phy);
+ }
+
+ err = phy_init(phy);
+ if (err < 0) {
+ dev_err(dev, "failed to initialize PHY#%u: %d\n", i,
+ err);
+ return err;
+ }
+
+ port->phys[i] = phy;
+ }
+
+ return 0;
+}
+
+static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ struct device_node *np = pcie->dev->of_node;
+ struct tegra_pcie_port *port;
+ int err;
+
+ if (!soc->has_gen2 || of_property_present(np, "phys"))
+ return tegra_pcie_phys_get_legacy(pcie);
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ err = tegra_pcie_port_get_phys(port);
+ if (err < 0)
+ return err;
+ }
+
+ return 0;
+}
+
+static void tegra_pcie_phys_put(struct tegra_pcie *pcie)
+{
+ struct tegra_pcie_port *port;
+ struct device *dev = pcie->dev;
+ int err, i;
+
+ if (pcie->legacy_phy) {
+ err = phy_exit(pcie->phy);
+ if (err < 0)
+ dev_err(dev, "failed to teardown PHY: %d\n", err);
+ return;
+ }
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ for (i = 0; i < port->lanes; i++) {
+ err = phy_exit(port->phys[i]);
+ if (err < 0)
+ dev_err(dev, "failed to teardown PHY#%u: %d\n",
+ i, err);
+ }
+ }
+}
+
+static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct resource *res;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ int err;
+
+ err = tegra_pcie_clocks_get(pcie);
+ if (err) {
+ dev_err(dev, "failed to get clocks: %d\n", err);
+ return err;
+ }
+
+ err = tegra_pcie_resets_get(pcie);
+ if (err) {
+ dev_err(dev, "failed to get resets: %d\n", err);
+ return err;
+ }
+
+ if (soc->program_uphy) {
+ err = tegra_pcie_phys_get(pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to get PHYs: %d\n", err);
+ return err;
+ }
+ }
+
+ pcie->pads = devm_platform_ioremap_resource_byname(pdev, "pads");
+ if (IS_ERR(pcie->pads)) {
+ err = PTR_ERR(pcie->pads);
+ goto phys_put;
+ }
+
+ pcie->afi = devm_platform_ioremap_resource_byname(pdev, "afi");
+ if (IS_ERR(pcie->afi)) {
+ err = PTR_ERR(pcie->afi);
+ goto phys_put;
+ }
+
+ /* request configuration space, but remap later, on demand */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs");
+ if (!res) {
+ err = -EADDRNOTAVAIL;
+ goto phys_put;
+ }
+
+ pcie->cs = *res;
+
+ /* constrain configuration space to 4 KiB */
+ pcie->cs.end = pcie->cs.start + SZ_4K - 1;
+
+ pcie->cfg = devm_ioremap_resource(dev, &pcie->cs);
+ if (IS_ERR(pcie->cfg)) {
+ err = PTR_ERR(pcie->cfg);
+ goto phys_put;
+ }
+
+ /* request interrupt */
+ err = platform_get_irq_byname(pdev, "intr");
+ if (err < 0)
+ goto phys_put;
+
+ pcie->irq = err;
+
+ err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie);
+ if (err) {
+ dev_err(dev, "failed to register IRQ: %d\n", err);
+ goto phys_put;
+ }
+
+ return 0;
+
+phys_put:
+ if (soc->program_uphy)
+ tegra_pcie_phys_put(pcie);
+
+ return err;
+}
+
+static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+
+ if (pcie->irq > 0)
+ free_irq(pcie->irq, pcie);
+
+ if (soc->program_uphy)
+ tegra_pcie_phys_put(pcie);
+
+ return 0;
+}
+
+static void tegra_pcie_pme_turnoff(struct tegra_pcie_port *port)
+{
+ struct tegra_pcie *pcie = port->pcie;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ int err;
+ u32 val;
+ u8 ack_bit;
+
+ val = afi_readl(pcie, AFI_PCIE_PME);
+ val |= (0x1 << soc->ports[port->index].pme.turnoff_bit);
+ afi_writel(pcie, val, AFI_PCIE_PME);
+
+ ack_bit = soc->ports[port->index].pme.ack_bit;
+ err = readl_poll_timeout(pcie->afi + AFI_PCIE_PME, val,
+ val & (0x1 << ack_bit), 1, PME_ACK_TIMEOUT);
+ if (err)
+ dev_err(pcie->dev, "PME Ack is not received on port: %d\n",
+ port->index);
+
+ usleep_range(10000, 11000);
+
+ val = afi_readl(pcie, AFI_PCIE_PME);
+ val &= ~(0x1 << soc->ports[port->index].pme.turnoff_bit);
+ afi_writel(pcie, val, AFI_PCIE_PME);
+}
+
+static void tegra_pcie_msi_irq(struct irq_desc *desc)
+{
+ struct tegra_pcie *pcie = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct tegra_msi *msi = &pcie->msi;
+ struct device *dev = pcie->dev;
+ unsigned int i;
+
+ chained_irq_enter(chip, desc);
+
+ for (i = 0; i < 8; i++) {
+ unsigned long reg = afi_readl(pcie, AFI_MSI_VEC(i));
+
+ while (reg) {
+ unsigned int offset = find_first_bit(&reg, 32);
+ unsigned int index = i * 32 + offset;
+ int ret;
+
+ ret = generic_handle_domain_irq(msi->domain->parent, index);
+ if (ret) {
+ /*
+ * that's weird who triggered this?
+ * just clear it
+ */
+ dev_info(dev, "unexpected MSI\n");
+ afi_writel(pcie, BIT(index % 32), AFI_MSI_VEC(index));
+ }
+
+ /* see if there's any more pending in this vector */
+ reg = afi_readl(pcie, AFI_MSI_VEC(i));
+ }
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void tegra_msi_top_irq_ack(struct irq_data *d)
+{
+ irq_chip_ack_parent(d);
+}
+
+static void tegra_msi_top_irq_mask(struct irq_data *d)
+{
+ pci_msi_mask_irq(d);
+ irq_chip_mask_parent(d);
+}
+
+static void tegra_msi_top_irq_unmask(struct irq_data *d)
+{
+ pci_msi_unmask_irq(d);
+ irq_chip_unmask_parent(d);
+}
+
+static struct irq_chip tegra_msi_top_chip = {
+ .name = "Tegra PCIe MSI",
+ .irq_ack = tegra_msi_top_irq_ack,
+ .irq_mask = tegra_msi_top_irq_mask,
+ .irq_unmask = tegra_msi_top_irq_unmask,
+};
+
+static void tegra_msi_irq_ack(struct irq_data *d)
+{
+ struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
+ struct tegra_pcie *pcie = msi_to_pcie(msi);
+ unsigned int index = d->hwirq / 32;
+
+ /* clear the interrupt */
+ afi_writel(pcie, BIT(d->hwirq % 32), AFI_MSI_VEC(index));
+}
+
+static void tegra_msi_irq_mask(struct irq_data *d)
+{
+ struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
+ struct tegra_pcie *pcie = msi_to_pcie(msi);
+ unsigned int index = d->hwirq / 32;
+ unsigned long flags;
+ u32 value;
+
+ spin_lock_irqsave(&msi->mask_lock, flags);
+ value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
+ value &= ~BIT(d->hwirq % 32);
+ afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
+ spin_unlock_irqrestore(&msi->mask_lock, flags);
+}
+
+static void tegra_msi_irq_unmask(struct irq_data *d)
+{
+ struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
+ struct tegra_pcie *pcie = msi_to_pcie(msi);
+ unsigned int index = d->hwirq / 32;
+ unsigned long flags;
+ u32 value;
+
+ spin_lock_irqsave(&msi->mask_lock, flags);
+ value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
+ value |= BIT(d->hwirq % 32);
+ afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
+ spin_unlock_irqrestore(&msi->mask_lock, flags);
+}
+
+static int tegra_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
+{
+ return -EINVAL;
+}
+
+static void tegra_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct tegra_msi *msi = irq_data_get_irq_chip_data(data);
+
+ msg->address_lo = lower_32_bits(msi->phys);
+ msg->address_hi = upper_32_bits(msi->phys);
+ msg->data = data->hwirq;
+}
+
+static struct irq_chip tegra_msi_bottom_chip = {
+ .name = "Tegra MSI",
+ .irq_ack = tegra_msi_irq_ack,
+ .irq_mask = tegra_msi_irq_mask,
+ .irq_unmask = tegra_msi_irq_unmask,
+ .irq_set_affinity = tegra_msi_set_affinity,
+ .irq_compose_msi_msg = tegra_compose_msi_msg,
+};
+
+static int tegra_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ struct tegra_msi *msi = domain->host_data;
+ unsigned int i;
+ int hwirq;
+
+ mutex_lock(&msi->map_lock);
+
+ hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
+
+ mutex_unlock(&msi->map_lock);
+
+ if (hwirq < 0)
+ return -ENOSPC;
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_domain_set_info(domain, virq + i, hwirq + i,
+ &tegra_msi_bottom_chip, domain->host_data,
+ handle_edge_irq, NULL, NULL);
+
+ tegra_cpuidle_pcie_irqs_in_use();
+
+ return 0;
+}
+
+static void tegra_msi_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+ struct tegra_msi *msi = domain->host_data;
+
+ mutex_lock(&msi->map_lock);
+
+ bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs));
+
+ mutex_unlock(&msi->map_lock);
+}
+
+static const struct irq_domain_ops tegra_msi_domain_ops = {
+ .alloc = tegra_msi_domain_alloc,
+ .free = tegra_msi_domain_free,
+};
+
+static struct msi_domain_info tegra_msi_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX),
+ .chip = &tegra_msi_top_chip,
+};
+
+static int tegra_allocate_domains(struct tegra_msi *msi)
+{
+ struct tegra_pcie *pcie = msi_to_pcie(msi);
+ struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
+ struct irq_domain *parent;
+
+ parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
+ &tegra_msi_domain_ops, msi);
+ if (!parent) {
+ dev_err(pcie->dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+ irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
+
+ msi->domain = pci_msi_create_irq_domain(fwnode, &tegra_msi_info, parent);
+ if (!msi->domain) {
+ dev_err(pcie->dev, "failed to create MSI domain\n");
+ irq_domain_remove(parent);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void tegra_free_domains(struct tegra_msi *msi)
+{
+ struct irq_domain *parent = msi->domain->parent;
+
+ irq_domain_remove(msi->domain);
+ irq_domain_remove(parent);
+}
+
+static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)
+{
+ struct platform_device *pdev = to_platform_device(pcie->dev);
+ struct tegra_msi *msi = &pcie->msi;
+ struct device *dev = pcie->dev;
+ int err;
+
+ mutex_init(&msi->map_lock);
+ spin_lock_init(&msi->mask_lock);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ err = tegra_allocate_domains(msi);
+ if (err)
+ return err;
+ }
+
+ err = platform_get_irq_byname(pdev, "msi");
+ if (err < 0)
+ goto free_irq_domain;
+
+ msi->irq = err;
+
+ irq_set_chained_handler_and_data(msi->irq, tegra_pcie_msi_irq, pcie);
+
+ /* Though the PCIe controller can address >32-bit address space, to
+ * facilitate endpoints that support only 32-bit MSI target address,
+ * the mask is set to 32-bit to make sure that MSI target address is
+ * always a 32-bit address
+ */
+ err = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+ if (err < 0) {
+ dev_err(dev, "failed to set DMA coherent mask: %d\n", err);
+ goto free_irq;
+ }
+
+ msi->virt = dma_alloc_attrs(dev, PAGE_SIZE, &msi->phys, GFP_KERNEL,
+ DMA_ATTR_NO_KERNEL_MAPPING);
+ if (!msi->virt) {
+ dev_err(dev, "failed to allocate DMA memory for MSI\n");
+ err = -ENOMEM;
+ goto free_irq;
+ }
+
+ return 0;
+
+free_irq:
+ irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
+free_irq_domain:
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_free_domains(msi);
+
+ return err;
+}
+
+static void tegra_pcie_enable_msi(struct tegra_pcie *pcie)
+{
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ struct tegra_msi *msi = &pcie->msi;
+ u32 reg, msi_state[INT_PCI_MSI_NR / 32];
+ int i;
+
+ afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
+ afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);
+ /* this register is in 4K increments */
+ afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
+
+ /* Restore the MSI allocation state */
+ bitmap_to_arr32(msi_state, msi->used, INT_PCI_MSI_NR);
+ for (i = 0; i < ARRAY_SIZE(msi_state); i++)
+ afi_writel(pcie, msi_state[i], AFI_MSI_EN_VEC(i));
+
+ /* and unmask the MSI interrupt */
+ reg = afi_readl(pcie, AFI_INTR_MASK);
+ reg |= AFI_INTR_MASK_MSI_MASK;
+ afi_writel(pcie, reg, AFI_INTR_MASK);
+}
+
+static void tegra_pcie_msi_teardown(struct tegra_pcie *pcie)
+{
+ struct tegra_msi *msi = &pcie->msi;
+ unsigned int i, irq;
+
+ dma_free_attrs(pcie->dev, PAGE_SIZE, msi->virt, msi->phys,
+ DMA_ATTR_NO_KERNEL_MAPPING);
+
+ for (i = 0; i < INT_PCI_MSI_NR; i++) {
+ irq = irq_find_mapping(msi->domain, i);
+ if (irq > 0)
+ irq_domain_free_irqs(irq, 1);
+ }
+
+ irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_free_domains(msi);
+}
+
+static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
+{
+ u32 value;
+
+ /* mask the MSI interrupt */
+ value = afi_readl(pcie, AFI_INTR_MASK);
+ value &= ~AFI_INTR_MASK_MSI_MASK;
+ afi_writel(pcie, value, AFI_INTR_MASK);
+
+ return 0;
+}
+
+static void tegra_pcie_disable_interrupts(struct tegra_pcie *pcie)
+{
+ u32 value;
+
+ value = afi_readl(pcie, AFI_INTR_MASK);
+ value &= ~AFI_INTR_MASK_INT_MASK;
+ afi_writel(pcie, value, AFI_INTR_MASK);
+}
+
+static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
+ u32 *xbar)
+{
+ struct device *dev = pcie->dev;
+ struct device_node *np = dev->of_node;
+
+ if (of_device_is_compatible(np, "nvidia,tegra186-pcie")) {
+ switch (lanes) {
+ case 0x010004:
+ dev_info(dev, "4x1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_401;
+ return 0;
+
+ case 0x010102:
+ dev_info(dev, "2x1, 1X1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211;
+ return 0;
+
+ case 0x010101:
+ dev_info(dev, "1x1, 1x1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111;
+ return 0;
+
+ default:
+ dev_info(dev, "wrong configuration updated in DT, "
+ "switching to default 2x1, 1x1, 1x1 "
+ "configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211;
+ return 0;
+ }
+ } else if (of_device_is_compatible(np, "nvidia,tegra124-pcie") ||
+ of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
+ switch (lanes) {
+ case 0x0000104:
+ dev_info(dev, "4x1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
+ return 0;
+
+ case 0x0000102:
+ dev_info(dev, "2x1, 1x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
+ return 0;
+ }
+ } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
+ switch (lanes) {
+ case 0x00000204:
+ dev_info(dev, "4x1, 2x1 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
+ return 0;
+
+ case 0x00020202:
+ dev_info(dev, "2x3 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
+ return 0;
+
+ case 0x00010104:
+ dev_info(dev, "4x1, 1x2 configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
+ return 0;
+ }
+ } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
+ switch (lanes) {
+ case 0x00000004:
+ dev_info(dev, "single-mode configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
+ return 0;
+
+ case 0x00000202:
+ dev_info(dev, "dual-mode configuration\n");
+ *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * Check whether a given set of supplies is available in a device tree node.
+ * This is used to check whether the new or the legacy device tree bindings
+ * should be used.
+ */
+static bool of_regulator_bulk_available(struct device_node *np,
+ struct regulator_bulk_data *supplies,
+ unsigned int num_supplies)
+{
+ char property[32];
+ unsigned int i;
+
+ for (i = 0; i < num_supplies; i++) {
+ snprintf(property, 32, "%s-supply", supplies[i].supply);
+
+ if (!of_property_present(np, property))
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * Old versions of the device tree binding for this device used a set of power
+ * supplies that didn't match the hardware inputs. This happened to work for a
+ * number of cases but is not future proof. However to preserve backwards-
+ * compatibility with old device trees, this function will try to use the old
+ * set of supplies.
+ */
+static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct device_node *np = dev->of_node;
+
+ if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
+ pcie->num_supplies = 3;
+ else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
+ pcie->num_supplies = 2;
+
+ if (pcie->num_supplies == 0) {
+ dev_err(dev, "device %pOF not supported in legacy mode\n", np);
+ return -ENODEV;
+ }
+
+ pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[0].supply = "pex-clk";
+ pcie->supplies[1].supply = "vdd";
+
+ if (pcie->num_supplies > 2)
+ pcie->supplies[2].supply = "avdd";
+
+ return devm_regulator_bulk_get(dev, pcie->num_supplies, pcie->supplies);
+}
+
+/*
+ * Obtains the list of regulators required for a particular generation of the
+ * IP block.
+ *
+ * This would've been nice to do simply by providing static tables for use
+ * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
+ * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
+ * and either seems to be optional depending on which ports are being used.
+ */
+static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
+{
+ struct device *dev = pcie->dev;
+ struct device_node *np = dev->of_node;
+ unsigned int i = 0;
+
+ if (of_device_is_compatible(np, "nvidia,tegra186-pcie")) {
+ pcie->num_supplies = 4;
+
+ pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[i++].supply = "dvdd-pex";
+ pcie->supplies[i++].supply = "hvdd-pex-pll";
+ pcie->supplies[i++].supply = "hvdd-pex";
+ pcie->supplies[i++].supply = "vddio-pexctl-aud";
+ } else if (of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
+ pcie->num_supplies = 3;
+
+ pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[i++].supply = "hvddio-pex";
+ pcie->supplies[i++].supply = "dvddio-pex";
+ pcie->supplies[i++].supply = "vddio-pex-ctl";
+ } else if (of_device_is_compatible(np, "nvidia,tegra124-pcie")) {
+ pcie->num_supplies = 4;
+
+ pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[i++].supply = "avddio-pex";
+ pcie->supplies[i++].supply = "dvddio-pex";
+ pcie->supplies[i++].supply = "hvdd-pex";
+ pcie->supplies[i++].supply = "vddio-pex-ctl";
+ } else if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
+ bool need_pexa = false, need_pexb = false;
+
+ /* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
+ if (lane_mask & 0x0f)
+ need_pexa = true;
+
+ /* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
+ if (lane_mask & 0x30)
+ need_pexb = true;
+
+ pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
+ (need_pexb ? 2 : 0);
+
+ pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[i++].supply = "avdd-pex-pll";
+ pcie->supplies[i++].supply = "hvdd-pex";
+ pcie->supplies[i++].supply = "vddio-pex-ctl";
+ pcie->supplies[i++].supply = "avdd-plle";
+
+ if (need_pexa) {
+ pcie->supplies[i++].supply = "avdd-pexa";
+ pcie->supplies[i++].supply = "vdd-pexa";
+ }
+
+ if (need_pexb) {
+ pcie->supplies[i++].supply = "avdd-pexb";
+ pcie->supplies[i++].supply = "vdd-pexb";
+ }
+ } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
+ pcie->num_supplies = 5;
+
+ pcie->supplies = devm_kcalloc(dev, pcie->num_supplies,
+ sizeof(*pcie->supplies),
+ GFP_KERNEL);
+ if (!pcie->supplies)
+ return -ENOMEM;
+
+ pcie->supplies[0].supply = "avdd-pex";
+ pcie->supplies[1].supply = "vdd-pex";
+ pcie->supplies[2].supply = "avdd-pex-pll";
+ pcie->supplies[3].supply = "avdd-plle";
+ pcie->supplies[4].supply = "vddio-pex-clk";
+ }
+
+ if (of_regulator_bulk_available(dev->of_node, pcie->supplies,
+ pcie->num_supplies))
+ return devm_regulator_bulk_get(dev, pcie->num_supplies,
+ pcie->supplies);
+
+ /*
+ * If not all regulators are available for this new scheme, assume
+ * that the device tree complies with an older version of the device
+ * tree binding.
+ */
+ dev_info(dev, "using legacy DT binding for power supplies\n");
+
+ devm_kfree(dev, pcie->supplies);
+ pcie->num_supplies = 0;
+
+ return tegra_pcie_get_legacy_regulators(pcie);
+}
+
+static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct device_node *np = dev->of_node, *port;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ u32 lanes = 0, mask = 0;
+ unsigned int lane = 0;
+ int err;
+
+ /* parse root ports */
+ for_each_child_of_node(np, port) {
+ struct tegra_pcie_port *rp;
+ unsigned int index;
+ u32 value;
+ char *label;
+
+ err = of_pci_get_devfn(port);
+ if (err < 0) {
+ dev_err(dev, "failed to parse address: %d\n", err);
+ goto err_node_put;
+ }
+
+ index = PCI_SLOT(err);
+
+ if (index < 1 || index > soc->num_ports) {
+ dev_err(dev, "invalid port number: %d\n", index);
+ err = -EINVAL;
+ goto err_node_put;
+ }
+
+ index--;
+
+ err = of_property_read_u32(port, "nvidia,num-lanes", &value);
+ if (err < 0) {
+ dev_err(dev, "failed to parse # of lanes: %d\n",
+ err);
+ goto err_node_put;
+ }
+
+ if (value > 16) {
+ dev_err(dev, "invalid # of lanes: %u\n", value);
+ err = -EINVAL;
+ goto err_node_put;
+ }
+
+ lanes |= value << (index << 3);
+
+ if (!of_device_is_available(port)) {
+ lane += value;
+ continue;
+ }
+
+ mask |= ((1 << value) - 1) << lane;
+ lane += value;
+
+ rp = devm_kzalloc(dev, sizeof(*rp), GFP_KERNEL);
+ if (!rp) {
+ err = -ENOMEM;
+ goto err_node_put;
+ }
+
+ err = of_address_to_resource(port, 0, &rp->regs);
+ if (err < 0) {
+ dev_err(dev, "failed to parse address: %d\n", err);
+ goto err_node_put;
+ }
+
+ INIT_LIST_HEAD(&rp->list);
+ rp->index = index;
+ rp->lanes = value;
+ rp->pcie = pcie;
+ rp->np = port;
+
+ rp->base = devm_pci_remap_cfg_resource(dev, &rp->regs);
+ if (IS_ERR(rp->base)) {
+ err = PTR_ERR(rp->base);
+ goto err_node_put;
+ }
+
+ label = devm_kasprintf(dev, GFP_KERNEL, "pex-reset-%u", index);
+ if (!label) {
+ err = -ENOMEM;
+ goto err_node_put;
+ }
+
+ /*
+ * Returns -ENOENT if reset-gpios property is not populated
+ * and in this case fall back to using AFI per port register
+ * to toggle PERST# SFIO line.
+ */
+ rp->reset_gpio = devm_fwnode_gpiod_get(dev,
+ of_fwnode_handle(port),
+ "reset",
+ GPIOD_OUT_LOW,
+ label);
+ if (IS_ERR(rp->reset_gpio)) {
+ if (PTR_ERR(rp->reset_gpio) == -ENOENT) {
+ rp->reset_gpio = NULL;
+ } else {
+ dev_err(dev, "failed to get reset GPIO: %ld\n",
+ PTR_ERR(rp->reset_gpio));
+ err = PTR_ERR(rp->reset_gpio);
+ goto err_node_put;
+ }
+ }
+
+ list_add_tail(&rp->list, &pcie->ports);
+ }
+
+ err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config);
+ if (err < 0) {
+ dev_err(dev, "invalid lane configuration\n");
+ return err;
+ }
+
+ err = tegra_pcie_get_regulators(pcie, mask);
+ if (err < 0)
+ return err;
+
+ return 0;
+
+err_node_put:
+ of_node_put(port);
+ return err;
+}
+
+/*
+ * FIXME: If there are no PCIe cards attached, then calling this function
+ * can result in the increase of the bootup time as there are big timeout
+ * loops.
+ */
+#define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */
+static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
+{
+ struct device *dev = port->pcie->dev;
+ unsigned int retries = 3;
+ unsigned long value;
+
+ /* override presence detection */
+ value = readl(port->base + RP_PRIV_MISC);
+ value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
+ value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
+ writel(value, port->base + RP_PRIV_MISC);
+
+ do {
+ unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
+
+ do {
+ value = readl(port->base + RP_VEND_XP);
+
+ if (value & RP_VEND_XP_DL_UP)
+ break;
+
+ usleep_range(1000, 2000);
+ } while (--timeout);
+
+ if (!timeout) {
+ dev_dbg(dev, "link %u down, retrying\n", port->index);
+ goto retry;
+ }
+
+ timeout = TEGRA_PCIE_LINKUP_TIMEOUT;
+
+ do {
+ value = readl(port->base + RP_LINK_CONTROL_STATUS);
+
+ if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
+ return true;
+
+ usleep_range(1000, 2000);
+ } while (--timeout);
+
+retry:
+ tegra_pcie_port_reset(port);
+ } while (--retries);
+
+ return false;
+}
+
+static void tegra_pcie_change_link_speed(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct tegra_pcie_port *port;
+ ktime_t deadline;
+ u32 value;
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ /*
+ * "Supported Link Speeds Vector" in "Link Capabilities 2"
+ * is not supported by Tegra. tegra_pcie_change_link_speed()
+ * is called only for Tegra chips which support Gen2.
+ * So there no harm if supported link speed is not verified.
+ */
+ value = readl(port->base + RP_LINK_CONTROL_STATUS_2);
+ value &= ~PCI_EXP_LNKSTA_CLS;
+ value |= PCI_EXP_LNKSTA_CLS_5_0GB;
+ writel(value, port->base + RP_LINK_CONTROL_STATUS_2);
+
+ /*
+ * Poll until link comes back from recovery to avoid race
+ * condition.
+ */
+ deadline = ktime_add_us(ktime_get(), LINK_RETRAIN_TIMEOUT);
+
+ while (ktime_before(ktime_get(), deadline)) {
+ value = readl(port->base + RP_LINK_CONTROL_STATUS);
+ if ((value & PCI_EXP_LNKSTA_LT) == 0)
+ break;
+
+ usleep_range(2000, 3000);
+ }
+
+ if (value & PCI_EXP_LNKSTA_LT)
+ dev_warn(dev, "PCIe port %u link is in recovery\n",
+ port->index);
+
+ /* Retrain the link */
+ value = readl(port->base + RP_LINK_CONTROL_STATUS);
+ value |= PCI_EXP_LNKCTL_RL;
+ writel(value, port->base + RP_LINK_CONTROL_STATUS);
+
+ deadline = ktime_add_us(ktime_get(), LINK_RETRAIN_TIMEOUT);
+
+ while (ktime_before(ktime_get(), deadline)) {
+ value = readl(port->base + RP_LINK_CONTROL_STATUS);
+ if ((value & PCI_EXP_LNKSTA_LT) == 0)
+ break;
+
+ usleep_range(2000, 3000);
+ }
+
+ if (value & PCI_EXP_LNKSTA_LT)
+ dev_err(dev, "failed to retrain link of port %u\n",
+ port->index);
+ }
+}
+
+static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct tegra_pcie_port *port, *tmp;
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ dev_info(dev, "probing port %u, using %u lanes\n",
+ port->index, port->lanes);
+
+ tegra_pcie_port_enable(port);
+ }
+
+ /* Start LTSSM from Tegra side */
+ reset_control_deassert(pcie->pcie_xrst);
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ if (tegra_pcie_port_check_link(port))
+ continue;
+
+ dev_info(dev, "link %u down, ignoring\n", port->index);
+
+ tegra_pcie_port_disable(port);
+ tegra_pcie_port_free(port);
+ }
+
+ if (pcie->soc->has_gen2)
+ tegra_pcie_change_link_speed(pcie);
+}
+
+static void tegra_pcie_disable_ports(struct tegra_pcie *pcie)
+{
+ struct tegra_pcie_port *port, *tmp;
+
+ reset_control_assert(pcie->pcie_xrst);
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+ tegra_pcie_port_disable(port);
+}
+
+static const struct tegra_pcie_port_soc tegra20_pcie_ports[] = {
+ { .pme.turnoff_bit = 0, .pme.ack_bit = 5 },
+ { .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
+};
+
+static const struct tegra_pcie_soc tegra20_pcie = {
+ .num_ports = 2,
+ .ports = tegra20_pcie_ports,
+ .msi_base_shift = 0,
+ .pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
+ .pads_refclk_cfg0 = 0xfa5cfa5c,
+ .has_pex_clkreq_en = false,
+ .has_pex_bias_ctrl = false,
+ .has_intr_prsnt_sense = false,
+ .has_cml_clk = false,
+ .has_gen2 = false,
+ .force_pca_enable = false,
+ .program_uphy = true,
+ .update_clamp_threshold = false,
+ .program_deskew_time = false,
+ .update_fc_timer = false,
+ .has_cache_bars = true,
+ .ectl.enable = false,
+};
+
+static const struct tegra_pcie_port_soc tegra30_pcie_ports[] = {
+ { .pme.turnoff_bit = 0, .pme.ack_bit = 5 },
+ { .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
+ { .pme.turnoff_bit = 16, .pme.ack_bit = 18 },
+};
+
+static const struct tegra_pcie_soc tegra30_pcie = {
+ .num_ports = 3,
+ .ports = tegra30_pcie_ports,
+ .msi_base_shift = 8,
+ .afi_pex2_ctrl = 0x128,
+ .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+ .pads_refclk_cfg0 = 0xfa5cfa5c,
+ .pads_refclk_cfg1 = 0xfa5cfa5c,
+ .has_pex_clkreq_en = true,
+ .has_pex_bias_ctrl = true,
+ .has_intr_prsnt_sense = true,
+ .has_cml_clk = true,
+ .has_gen2 = false,
+ .force_pca_enable = false,
+ .program_uphy = true,
+ .update_clamp_threshold = false,
+ .program_deskew_time = false,
+ .update_fc_timer = false,
+ .has_cache_bars = false,
+ .ectl.enable = false,
+};
+
+static const struct tegra_pcie_soc tegra124_pcie = {
+ .num_ports = 2,
+ .ports = tegra20_pcie_ports,
+ .msi_base_shift = 8,
+ .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+ .pads_refclk_cfg0 = 0x44ac44ac,
+ .has_pex_clkreq_en = true,
+ .has_pex_bias_ctrl = true,
+ .has_intr_prsnt_sense = true,
+ .has_cml_clk = true,
+ .has_gen2 = true,
+ .force_pca_enable = false,
+ .program_uphy = true,
+ .update_clamp_threshold = true,
+ .program_deskew_time = false,
+ .update_fc_timer = false,
+ .has_cache_bars = false,
+ .ectl.enable = false,
+};
+
+static const struct tegra_pcie_soc tegra210_pcie = {
+ .num_ports = 2,
+ .ports = tegra20_pcie_ports,
+ .msi_base_shift = 8,
+ .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+ .pads_refclk_cfg0 = 0x90b890b8,
+ /* FC threshold is bit[25:18] */
+ .update_fc_threshold = 0x01800000,
+ .has_pex_clkreq_en = true,
+ .has_pex_bias_ctrl = true,
+ .has_intr_prsnt_sense = true,
+ .has_cml_clk = true,
+ .has_gen2 = true,
+ .force_pca_enable = true,
+ .program_uphy = true,
+ .update_clamp_threshold = true,
+ .program_deskew_time = true,
+ .update_fc_timer = true,
+ .has_cache_bars = false,
+ .ectl = {
+ .regs = {
+ .rp_ectl_2_r1 = 0x0000000f,
+ .rp_ectl_4_r1 = 0x00000067,
+ .rp_ectl_5_r1 = 0x55010000,
+ .rp_ectl_6_r1 = 0x00000001,
+ .rp_ectl_2_r2 = 0x0000008f,
+ .rp_ectl_4_r2 = 0x000000c7,
+ .rp_ectl_5_r2 = 0x55010000,
+ .rp_ectl_6_r2 = 0x00000001,
+ },
+ .enable = true,
+ },
+};
+
+static const struct tegra_pcie_port_soc tegra186_pcie_ports[] = {
+ { .pme.turnoff_bit = 0, .pme.ack_bit = 5 },
+ { .pme.turnoff_bit = 8, .pme.ack_bit = 10 },
+ { .pme.turnoff_bit = 12, .pme.ack_bit = 14 },
+};
+
+static const struct tegra_pcie_soc tegra186_pcie = {
+ .num_ports = 3,
+ .ports = tegra186_pcie_ports,
+ .msi_base_shift = 8,
+ .afi_pex2_ctrl = 0x19c,
+ .pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+ .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+ .pads_refclk_cfg0 = 0x80b880b8,
+ .pads_refclk_cfg1 = 0x000480b8,
+ .has_pex_clkreq_en = true,
+ .has_pex_bias_ctrl = true,
+ .has_intr_prsnt_sense = true,
+ .has_cml_clk = false,
+ .has_gen2 = true,
+ .force_pca_enable = false,
+ .program_uphy = false,
+ .update_clamp_threshold = false,
+ .program_deskew_time = false,
+ .update_fc_timer = false,
+ .has_cache_bars = false,
+ .ectl.enable = false,
+};
+
+static const struct of_device_id tegra_pcie_of_match[] = {
+ { .compatible = "nvidia,tegra186-pcie", .data = &tegra186_pcie },
+ { .compatible = "nvidia,tegra210-pcie", .data = &tegra210_pcie },
+ { .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie },
+ { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie },
+ { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
+
+static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct tegra_pcie *pcie = s->private;
+
+ if (list_empty(&pcie->ports))
+ return NULL;
+
+ seq_puts(s, "Index Status\n");
+
+ return seq_list_start(&pcie->ports, *pos);
+}
+
+static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct tegra_pcie *pcie = s->private;
+
+ return seq_list_next(v, &pcie->ports, pos);
+}
+
+static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
+{
+}
+
+static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
+{
+ bool up = false, active = false;
+ struct tegra_pcie_port *port;
+ unsigned int value;
+
+ port = list_entry(v, struct tegra_pcie_port, list);
+
+ value = readl(port->base + RP_VEND_XP);
+
+ if (value & RP_VEND_XP_DL_UP)
+ up = true;
+
+ value = readl(port->base + RP_LINK_CONTROL_STATUS);
+
+ if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
+ active = true;
+
+ seq_printf(s, "%2u ", port->index);
+
+ if (up)
+ seq_puts(s, "up");
+
+ if (active) {
+ if (up)
+ seq_puts(s, ", ");
+
+ seq_puts(s, "active");
+ }
+
+ seq_puts(s, "\n");
+ return 0;
+}
+
+static const struct seq_operations tegra_pcie_ports_sops = {
+ .start = tegra_pcie_ports_seq_start,
+ .next = tegra_pcie_ports_seq_next,
+ .stop = tegra_pcie_ports_seq_stop,
+ .show = tegra_pcie_ports_seq_show,
+};
+
+DEFINE_SEQ_ATTRIBUTE(tegra_pcie_ports);
+
+static void tegra_pcie_debugfs_exit(struct tegra_pcie *pcie)
+{
+ debugfs_remove_recursive(pcie->debugfs);
+ pcie->debugfs = NULL;
+}
+
+static void tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
+{
+ pcie->debugfs = debugfs_create_dir("pcie", NULL);
+
+ debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs, pcie,
+ &tegra_pcie_ports_fops);
+}
+
+static int tegra_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pci_host_bridge *host;
+ struct tegra_pcie *pcie;
+ int err;
+
+ host = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
+ if (!host)
+ return -ENOMEM;
+
+ pcie = pci_host_bridge_priv(host);
+ host->sysdata = pcie;
+ platform_set_drvdata(pdev, pcie);
+
+ pcie->soc = of_device_get_match_data(dev);
+ INIT_LIST_HEAD(&pcie->ports);
+ pcie->dev = dev;
+
+ err = tegra_pcie_parse_dt(pcie);
+ if (err < 0)
+ return err;
+
+ err = tegra_pcie_get_resources(pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to request resources: %d\n", err);
+ return err;
+ }
+
+ err = tegra_pcie_msi_setup(pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to enable MSI support: %d\n", err);
+ goto put_resources;
+ }
+
+ pm_runtime_enable(pcie->dev);
+ err = pm_runtime_get_sync(pcie->dev);
+ if (err < 0) {
+ dev_err(dev, "fail to enable pcie controller: %d\n", err);
+ goto pm_runtime_put;
+ }
+
+ host->ops = &tegra_pcie_ops;
+ host->map_irq = tegra_pcie_map_irq;
+
+ err = pci_host_probe(host);
+ if (err < 0) {
+ dev_err(dev, "failed to register host: %d\n", err);
+ goto pm_runtime_put;
+ }
+
+ if (IS_ENABLED(CONFIG_DEBUG_FS))
+ tegra_pcie_debugfs_init(pcie);
+
+ return 0;
+
+pm_runtime_put:
+ pm_runtime_put_sync(pcie->dev);
+ pm_runtime_disable(pcie->dev);
+ tegra_pcie_msi_teardown(pcie);
+put_resources:
+ tegra_pcie_put_resources(pcie);
+ return err;
+}
+
+static void tegra_pcie_remove(struct platform_device *pdev)
+{
+ struct tegra_pcie *pcie = platform_get_drvdata(pdev);
+ struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+ struct tegra_pcie_port *port, *tmp;
+
+ if (IS_ENABLED(CONFIG_DEBUG_FS))
+ tegra_pcie_debugfs_exit(pcie);
+
+ pci_stop_root_bus(host->bus);
+ pci_remove_root_bus(host->bus);
+ pm_runtime_put_sync(pcie->dev);
+ pm_runtime_disable(pcie->dev);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_pcie_msi_teardown(pcie);
+
+ tegra_pcie_put_resources(pcie);
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list)
+ tegra_pcie_port_free(port);
+}
+
+static int tegra_pcie_pm_suspend(struct device *dev)
+{
+ struct tegra_pcie *pcie = dev_get_drvdata(dev);
+ struct tegra_pcie_port *port;
+ int err;
+
+ list_for_each_entry(port, &pcie->ports, list)
+ tegra_pcie_pme_turnoff(port);
+
+ tegra_pcie_disable_ports(pcie);
+
+ /*
+ * AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to
+ * avoid unwanted interrupts raised by AFI after pex_rst is asserted.
+ */
+ tegra_pcie_disable_interrupts(pcie);
+
+ if (pcie->soc->program_uphy) {
+ err = tegra_pcie_phy_power_off(pcie);
+ if (err < 0)
+ dev_err(dev, "failed to power off PHY(s): %d\n", err);
+ }
+
+ reset_control_assert(pcie->pex_rst);
+ clk_disable_unprepare(pcie->pex_clk);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_pcie_disable_msi(pcie);
+
+ pinctrl_pm_select_idle_state(dev);
+ tegra_pcie_power_off(pcie);
+
+ return 0;
+}
+
+static int tegra_pcie_pm_resume(struct device *dev)
+{
+ struct tegra_pcie *pcie = dev_get_drvdata(dev);
+ int err;
+
+ err = tegra_pcie_power_on(pcie);
+ if (err) {
+ dev_err(dev, "tegra pcie power on fail: %d\n", err);
+ return err;
+ }
+
+ err = pinctrl_pm_select_default_state(dev);
+ if (err < 0) {
+ dev_err(dev, "failed to disable PCIe IO DPD: %d\n", err);
+ goto poweroff;
+ }
+
+ tegra_pcie_enable_controller(pcie);
+ tegra_pcie_setup_translations(pcie);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ tegra_pcie_enable_msi(pcie);
+
+ err = clk_prepare_enable(pcie->pex_clk);
+ if (err) {
+ dev_err(dev, "failed to enable PEX clock: %d\n", err);
+ goto pex_dpd_enable;
+ }
+
+ reset_control_deassert(pcie->pex_rst);
+
+ if (pcie->soc->program_uphy) {
+ err = tegra_pcie_phy_power_on(pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to power on PHY(s): %d\n", err);
+ goto disable_pex_clk;
+ }
+ }
+
+ tegra_pcie_apply_pad_settings(pcie);
+ tegra_pcie_enable_ports(pcie);
+
+ return 0;
+
+disable_pex_clk:
+ reset_control_assert(pcie->pex_rst);
+ clk_disable_unprepare(pcie->pex_clk);
+pex_dpd_enable:
+ pinctrl_pm_select_idle_state(dev);
+poweroff:
+ tegra_pcie_power_off(pcie);
+
+ return err;
+}
+
+static const struct dev_pm_ops tegra_pcie_pm_ops = {
+ RUNTIME_PM_OPS(tegra_pcie_pm_suspend, tegra_pcie_pm_resume, NULL)
+ NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_pcie_pm_suspend, tegra_pcie_pm_resume)
+};
+
+static struct platform_driver tegra_pcie_driver = {
+ .driver = {
+ .name = "tegra-pcie",
+ .of_match_table = tegra_pcie_of_match,
+ .suppress_bind_attrs = true,
+ .pm = &tegra_pcie_pm_ops,
+ },
+ .probe = tegra_pcie_probe,
+ .remove_new = tegra_pcie_remove,
+};
+module_platform_driver(tegra_pcie_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 11:43:03 +0000