--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCIe host controller driver for Starfive JH7110 Soc.
+ *
+ * Based on pcie-altera.c, pcie-altera-msi.c.
+ *
+ * Copyright (C) StarFive Technology Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/pci-ecam.h>
+#include <linux/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include "../pci.h"
+
+#define IMASK_LOCAL 0x180
+#define ISTATUS_LOCAL 0x184
+#define IMSI_ADDR 0x190
+#define ISTATUS_MSI 0x194
+#define GEN_SETTINGS 0x80
+#define PCIE_PCI_IDS 0x9C
+#define PCIE_WINROM 0xFC
+#define PMSG_SUPPORT_RX 0x3F0
+
+#define PCI_MISC 0xB4
+
+#define RP_ENABLE 1
+
+#define IDS_CLASS_CODE_SHIFT 16
+
+#define DATA_LINK_ACTIVE BIT(5)
+#define PREF_MEM_WIN_64_SUPPORT BIT(3)
+#define PMSG_LTR_SUPPORT BIT(2)
+#define LINK_SPEED_GEN2 BIT(12)
+#define PHY_FUNCTION_DIS BIT(15)
+#define PCIE_FUNC_NUM 4
+#define PHY_FUNC_SHIFT 9
+
+#define XR3PCI_ATR_AXI4_SLV0 0x800
+#define XR3PCI_ATR_SRC_ADDR_LOW 0x0
+#define XR3PCI_ATR_SRC_ADDR_HIGH 0x4
+#define XR3PCI_ATR_TRSL_ADDR_LOW 0x8
+#define XR3PCI_ATR_TRSL_ADDR_HIGH 0xc
+#define XR3PCI_ATR_TRSL_PARAM 0x10
+#define XR3PCI_ATR_TABLE_OFFSET 0x20
+#define XR3PCI_ATR_MAX_TABLE_NUM 8
+
+#define XR3PCI_ATR_SRC_WIN_SIZE_SHIFT 1
+#define XR3PCI_ATR_SRC_ADDR_MASK GENMASK(31, 12)
+#define XR3PCI_ATR_TRSL_ADDR_MASK GENMASK(31, 12)
+#define XR3PCI_ECAM_SIZE BIT(28)
+#define XR3PCI_ATR_TRSL_DIR BIT(22)
+/* IDs used in the XR3PCI_ATR_TRSL_PARAM */
+#define XR3PCI_ATR_TRSLID_PCIE_MEMORY 0x0
+#define XR3PCI_ATR_TRSLID_PCIE_CONFIG 0x1
+
+#define INT_AXI_POST_ERROR BIT(16)
+#define INT_AXI_FETCH_ERROR BIT(17)
+#define INT_AXI_DISCARD_ERROR BIT(18)
+#define INT_PCIE_POST_ERROR BIT(20)
+#define INT_PCIE_FETCH_ERROR BIT(21)
+#define INT_PCIE_DISCARD_ERROR BIT(22)
+#define INT_ERRORS (INT_AXI_POST_ERROR | INT_AXI_FETCH_ERROR | \
+ INT_AXI_DISCARD_ERROR | INT_PCIE_POST_ERROR | \
+ INT_PCIE_FETCH_ERROR | INT_PCIE_DISCARD_ERROR)
+
+#define INTA_OFFSET 24
+#define INTA BIT(24)
+#define INTB BIT(25)
+#define INTC BIT(26)
+#define INTD BIT(27)
+#define INT_MSI BIT(28)
+#define INT_INTX_MASK (INTA | INTB | INTC | INTD)
+#define INT_MASK (INT_INTX_MASK | INT_MSI | INT_ERRORS)
+
+#define INT_PCI_MSI_NR 32
+
+/* system control */
+#define STG_SYSCON_K_RP_NEP BIT(8)
+#define STG_SYSCON_AXI4_SLVL_ARFUNC_MASK GENMASK(22, 8)
+#define STG_SYSCON_AXI4_SLVL_ARFUNC_SHIFT 8
+#define STG_SYSCON_AXI4_SLVL_AWFUNC_MASK GENMASK(14, 0)
+#define STG_SYSCON_CLKREQ BIT(22)
+#define STG_SYSCON_CKREF_SRC_SHIFT 18
+#define STG_SYSCON_CKREF_SRC_MASK GENMASK(19, 18)
+
+/* MSI information */
+struct jh7110_pcie_msi {
+ DECLARE_BITMAP(used, INT_PCI_MSI_NR);
+ struct irq_domain *msi_domain;
+ struct irq_domain *inner_domain;
+ /* Protect bitmap variable */
+ struct mutex lock;
+};
+
+struct starfive_jh7110_pcie {
+ struct platform_device *pdev;
+ void __iomem *reg_base;
+ void __iomem *config_base;
+ phys_addr_t config_phyaddr;
+ struct regmap *reg_syscon;
+ struct phy *phy;
+ u32 stg_arfun;
+ u32 stg_awfun;
+ u32 stg_rp_nep;
+ u32 stg_lnksta;
+ int irq;
+ struct irq_domain *legacy_irq_domain;
+ struct pci_host_bridge *bridge;
+ struct jh7110_pcie_msi msi;
+ struct reset_control *resets;
+ struct clk_bulk_data *clks;
+ int num_clks;
+ int atr_table_num;
+ struct gpio_desc *power_gpio;
+ struct gpio_desc *reset_gpio;
+};
+
+/*
+ * StarFive PCIe port uses BAR0-BAR1 of RC's configuration space as
+ * the translation from PCI bus to native BUS. Entire DDR region
+ * is mapped into PCIe space using these registers, so it can be
+ * reached by DMA from EP devices. The BAR0/1 of bridge should be
+ * hidden during enumeration to avoid the sizing and resource allocation
+ * by PCIe core.
+ */
+static bool starfive_pcie_hide_rc_bar(struct pci_bus *bus, unsigned int devfn,
+ int offset)
+{
+ if (pci_is_root_bus(bus) && (devfn == 0)
+ && ((offset == PCI_BASE_ADDRESS_0)
+ || (offset == PCI_BASE_ADDRESS_1)))
+ return true;
+
+ return false;
+}
+
+void __iomem *starfive_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+ int where)
+{
+ struct starfive_jh7110_pcie *pcie = bus->sysdata;
+
+ return pcie->config_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
+}
+
+int starfive_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 value)
+{
+ if (starfive_pcie_hide_rc_bar(bus, devfn, where))
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ return pci_generic_config_write(bus, devfn, where, size, value);
+}
+
+static void starfive_pcie_handle_msi_irq(struct starfive_jh7110_pcie *pcie)
+{
+ struct jh7110_pcie_msi *msi = &pcie->msi;
+ u32 bit;
+ u32 virq;
+ unsigned long status = readl(pcie->reg_base + ISTATUS_MSI);
+
+ for_each_set_bit(bit, &status, INT_PCI_MSI_NR) {
+ /* Clear interrupts */
+ writel(1 << bit, pcie->reg_base + ISTATUS_MSI);
+ virq = irq_find_mapping(msi->inner_domain, bit);
+ if (virq) {
+ if (test_bit(bit, msi->used))
+ generic_handle_irq(virq);
+ else
+ dev_err(&pcie->pdev->dev,
+ "Unhandled MSI, MSI%d virq %d\n", bit,
+ virq);
+ } else
+ dev_err(&pcie->pdev->dev, "Unexpected MSI, MSI%d\n",
+ bit);
+ }
+ writel(INT_MSI, pcie->reg_base + ISTATUS_LOCAL);
+}
+
+static void starfive_pcie_handle_intx_irq(struct starfive_jh7110_pcie *pcie,
+ unsigned long status)
+{
+ u32 bit;
+ u32 virq;
+
+ status >>= INTA_OFFSET;
+
+ for_each_set_bit(bit, &status, PCI_NUM_INTX) {
+ /* Clear interrupts */
+ writel(1 << (bit + INTA_OFFSET), pcie->reg_base + ISTATUS_LOCAL);
+
+ virq = irq_find_mapping(pcie->legacy_irq_domain, bit);
+ if (virq)
+ generic_handle_irq(virq);
+ else
+ dev_err(&pcie->pdev->dev,
+ "unexpected IRQ, INT%d\n", bit);
+ }
+}
+
+static void starfive_pcie_handle_errors_irq(struct starfive_jh7110_pcie *pcie, u32 status)
+{
+ if (status & INT_AXI_POST_ERROR)
+ dev_err(&pcie->pdev->dev, "AXI post error\n");
+ if (status & INT_AXI_FETCH_ERROR)
+ dev_err(&pcie->pdev->dev, "AXI fetch error\n");
+ if (status & INT_AXI_DISCARD_ERROR)
+ dev_err(&pcie->pdev->dev, "AXI discard error\n");
+ if (status & INT_PCIE_POST_ERROR)
+ dev_err(&pcie->pdev->dev, "PCIe post error\n");
+ if (status & INT_PCIE_FETCH_ERROR)
+ dev_err(&pcie->pdev->dev, "PCIe fetch error\n");
+ if (status & INT_PCIE_DISCARD_ERROR)
+ dev_err(&pcie->pdev->dev, "PCIe discard error\n");
+
+ writel(INT_ERRORS, pcie->reg_base + ISTATUS_LOCAL);
+}
+
+static void starfive_pcie_isr(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct starfive_jh7110_pcie *pcie;
+ u32 status;
+
+ chained_irq_enter(chip, desc);
+ pcie = irq_desc_get_handler_data(desc);
+
+ status = readl(pcie->reg_base + ISTATUS_LOCAL);
+ while ((status = (readl(pcie->reg_base + ISTATUS_LOCAL) & INT_MASK))) {
+ if (status & INT_INTX_MASK)
+ starfive_pcie_handle_intx_irq(pcie, status);
+
+ if (status & INT_MSI)
+ starfive_pcie_handle_msi_irq(pcie);
+
+ if (status & INT_ERRORS)
+ starfive_pcie_handle_errors_irq(pcie, status);
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+#ifdef CONFIG_PCI_MSI
+static struct irq_chip starfive_pcie_msi_irq_chip = {
+ .name = "StarFive PCIe MSI",
+ .irq_mask = pci_msi_mask_irq,
+ .irq_unmask = pci_msi_unmask_irq,
+};
+
+static struct msi_domain_info starfive_pcie_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX),
+ .chip = &starfive_pcie_msi_irq_chip,
+};
+#endif
+
+static void starfive_pcie_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct starfive_jh7110_pcie *pcie = irq_data_get_irq_chip_data(data);
+ phys_addr_t msi_addr = readl(pcie->reg_base + IMSI_ADDR);
+
+ msg->address_lo = lower_32_bits(msi_addr);
+ msg->address_hi = upper_32_bits(msi_addr);
+ msg->data = data->hwirq;
+
+ dev_info(&pcie->pdev->dev, "msi#%d address_hi %#x address_lo %#x\n",
+ (int)data->hwirq, msg->address_hi, msg->address_lo);
+}
+
+static int starfive_pcie_msi_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *mask, bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip starfive_irq_chip = {
+ .name = "StarFive MSI",
+ .irq_compose_msi_msg = starfive_pcie_compose_msi_msg,
+ .irq_set_affinity = starfive_pcie_msi_set_affinity,
+};
+
+static int starfive_pcie_msi_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ struct starfive_jh7110_pcie *pcie = domain->host_data;
+ struct jh7110_pcie_msi *msi = &pcie->msi;
+ int bit;
+
+ WARN_ON(nr_irqs != 1);
+ mutex_lock(&msi->lock);
+
+ bit = find_first_zero_bit(msi->used, INT_PCI_MSI_NR);
+ if (bit >= INT_PCI_MSI_NR) {
+ mutex_unlock(&msi->lock);
+ return -ENOSPC;
+ }
+
+ set_bit(bit, msi->used);
+
+ irq_domain_set_info(domain, virq, bit, &starfive_irq_chip,
+ domain->host_data, handle_simple_irq,
+ NULL, NULL);
+ mutex_unlock(&msi->lock);
+
+ return 0;
+}
+
+static void starfive_pcie_msi_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *data = irq_domain_get_irq_data(domain, virq);
+ struct starfive_jh7110_pcie *pcie = irq_data_get_irq_chip_data(data);
+ struct jh7110_pcie_msi *msi = &pcie->msi;
+
+ mutex_lock(&msi->lock);
+
+ if (!test_bit(data->hwirq, msi->used))
+ dev_err(&pcie->pdev->dev, "Trying to free unused MSI#%lu\n",
+ data->hwirq);
+ else
+ __clear_bit(data->hwirq, msi->used);
+
+ writel(0xffffffff, pcie->reg_base + ISTATUS_MSI);
+ mutex_unlock(&msi->lock);
+}
+
+static const struct irq_domain_ops dev_msi_domain_ops = {
+ .alloc = starfive_pcie_msi_alloc,
+ .free = starfive_pcie_msi_free,
+};
+
+static void starfive_pcie_msi_free_irq_domain(struct starfive_jh7110_pcie *pcie)
+{
+#ifdef CONFIG_PCI_MSI
+ struct jh7110_pcie_msi *msi = &pcie->msi;
+ u32 irq;
+ int i;
+
+ for (i = 0; i < INT_PCI_MSI_NR; i++) {
+ irq = irq_find_mapping(msi->inner_domain, i);
+ if (irq > 0)
+ irq_dispose_mapping(irq);
+ }
+
+ if (msi->msi_domain)
+ irq_domain_remove(msi->msi_domain);
+
+ if (msi->inner_domain)
+ irq_domain_remove(msi->inner_domain);
+#endif
+}
+
+static void starfive_pcie_free_irq_domain(struct starfive_jh7110_pcie *pcie)
+{
+ int i;
+ u32 irq;
+
+ /* Disable all interrupts */
+ writel(0, pcie->reg_base + IMASK_LOCAL);
+
+ if (pcie->legacy_irq_domain) {
+ for (i = 0; i < PCI_NUM_INTX; i++) {
+ irq = irq_find_mapping(pcie->legacy_irq_domain, i);
+ if (irq > 0)
+ irq_dispose_mapping(irq);
+ }
+ irq_domain_remove(pcie->legacy_irq_domain);
+ }
+
+ if (pci_msi_enabled())
+ starfive_pcie_msi_free_irq_domain(pcie);
+ irq_set_chained_handler_and_data(pcie->irq, NULL, NULL);
+}
+
+static int starfive_pcie_init_msi_irq_domain(struct starfive_jh7110_pcie *pcie)
+{
+#ifdef CONFIG_PCI_MSI
+ struct fwnode_handle *fwn = of_node_to_fwnode(pcie->pdev->dev.of_node);
+ struct jh7110_pcie_msi *msi = &pcie->msi;
+
+ msi->inner_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR,
+ &dev_msi_domain_ops, pcie);
+ if (!msi->inner_domain) {
+ dev_err(&pcie->pdev->dev, "Failed to create dev IRQ domain\n");
+ return -ENOMEM;
+ }
+ msi->msi_domain = pci_msi_create_irq_domain(fwn, &starfive_pcie_msi_domain_info,
+ msi->inner_domain);
+ if (!msi->msi_domain) {
+ dev_err(&pcie->pdev->dev, "Failed to create msi IRQ domain\n");
+ irq_domain_remove(msi->inner_domain);
+ return -ENOMEM;
+ }
+#endif
+ return 0;
+}
+
+static int starfive_pcie_enable_msi(struct starfive_jh7110_pcie *pcie, struct pci_bus *bus)
+{
+ struct jh7110_pcie_msi *msi = &pcie->msi;
+ u32 reg;
+
+ mutex_init(&msi->lock);
+
+ /* Enable MSI */
+ reg = readl(pcie->reg_base + IMASK_LOCAL);
+ reg |= INT_MSI;
+ writel(reg, pcie->reg_base + IMASK_LOCAL);
+ return 0;
+}
+
+static int starfive_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops intx_domain_ops = {
+ .map = starfive_pcie_intx_map,
+ .xlate = pci_irqd_intx_xlate,
+};
+
+static int starfive_pcie_init_irq_domain(struct starfive_jh7110_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ struct device_node *node = dev->of_node;
+ int ret;
+
+ if (pci_msi_enabled()) {
+ ret = starfive_pcie_init_msi_irq_domain(pcie);
+ if (ret != 0)
+ return -ENOMEM;
+ }
+
+ /* Setup INTx */
+ pcie->legacy_irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX,
+ &intx_domain_ops, pcie);
+
+ if (!pcie->legacy_irq_domain) {
+ dev_err(dev, "Failed to get a INTx IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ irq_set_chained_handler_and_data(pcie->irq, starfive_pcie_isr, pcie);
+
+ return 0;
+}
+
+static int starfive_pcie_parse_dt(struct starfive_jh7110_pcie *pcie)
+{
+ struct resource *cfg_res;
+ struct platform_device *pdev = pcie->pdev;
+ unsigned int args[4];
+
+ pcie->reg_base =
+ devm_platform_ioremap_resource_byname(pdev, "reg");
+
+ if (IS_ERR(pcie->reg_base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(pcie->reg_base),
+ "Failed to map reg memory\n");
+
+ cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
+ if (!cfg_res)
+ return dev_err_probe(&pdev->dev, -ENODEV,
+ "Failed to get config memory\n");
+
+ pcie->config_base = devm_ioremap_resource(&pdev->dev, cfg_res);
+ if (IS_ERR(pcie->config_base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(pcie->config_base),
+ "Failed to map config memory\n");
+
+ pcie->config_phyaddr = cfg_res->start;
+
+ pcie->phy = devm_phy_optional_get(&pdev->dev, NULL);
+ if (IS_ERR(pcie->phy))
+ return dev_err_probe(&pdev->dev, PTR_ERR(pcie->phy),
+ "Failed to get pcie phy\n");
+
+ pcie->irq = platform_get_irq(pdev, 0);
+ if (pcie->irq < 0)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "Failed to get IRQ: %d\n", pcie->irq);
+
+ pcie->reg_syscon = syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
+ "starfive,stg-syscon", 4, args);
+
+ if (IS_ERR(pcie->reg_syscon))
+ return dev_err_probe(&pdev->dev, PTR_ERR(pcie->reg_syscon),
+ "Failed to parse starfive,stg-syscon\n");
+
+ pcie->stg_arfun = args[0];
+ pcie->stg_awfun = args[1];
+ pcie->stg_rp_nep = args[2];
+ pcie->stg_lnksta = args[3];
+
+ /* Clear all interrupts */
+ writel(0xffffffff, pcie->reg_base + ISTATUS_LOCAL);
+ writel(INT_INTX_MASK | INT_ERRORS, pcie->reg_base + IMASK_LOCAL);
+
+ return 0;
+}
+
+static struct pci_ops starfive_pcie_ops = {
+ .map_bus = starfive_pcie_map_bus,
+ .read = pci_generic_config_read,
+ .write = starfive_pcie_config_write,
+};
+
+static void starfive_pcie_set_atr_entry(struct starfive_jh7110_pcie *pcie,
+ phys_addr_t src_addr, phys_addr_t trsl_addr,
+ size_t window_size, int trsl_param)
+{
+ void __iomem *base =
+ pcie->reg_base + XR3PCI_ATR_AXI4_SLV0;
+
+ /* Support AXI4 Slave 0 Address Translation Tables 0-7. */
+ if (pcie->atr_table_num >= XR3PCI_ATR_MAX_TABLE_NUM)
+ pcie->atr_table_num = XR3PCI_ATR_MAX_TABLE_NUM - 1;
+ base += XR3PCI_ATR_TABLE_OFFSET * pcie->atr_table_num;
+ pcie->atr_table_num++;
+
+ /*
+ * X3PCI_ATR_SRC_ADDR_LOW:
+ * - bit 0: enable entry,
+ * - bits 1-6: ATR window size: total size in bytes: 2^(ATR_WSIZE + 1)
+ * - bits 7-11: reserved
+ * - bits 12-31: start of source address
+ */
+ writel((lower_32_bits(src_addr) & XR3PCI_ATR_SRC_ADDR_MASK) |
+ (fls(window_size) - 1) << XR3PCI_ATR_SRC_WIN_SIZE_SHIFT | 1,
+ base + XR3PCI_ATR_SRC_ADDR_LOW);
+ writel(upper_32_bits(src_addr), base + XR3PCI_ATR_SRC_ADDR_HIGH);
+ writel((lower_32_bits(trsl_addr) & XR3PCI_ATR_TRSL_ADDR_MASK),
+ base + XR3PCI_ATR_TRSL_ADDR_LOW);
+ writel(upper_32_bits(trsl_addr), base + XR3PCI_ATR_TRSL_ADDR_HIGH);
+ writel(trsl_param, base + XR3PCI_ATR_TRSL_PARAM);
+
+ dev_info(&pcie->pdev->dev, "ATR entry: 0x%010llx %s 0x%010llx [0x%010llx] (param: 0x%06x)\n",
+ src_addr, (trsl_param & XR3PCI_ATR_TRSL_DIR) ? "<-" : "->",
+ trsl_addr, (u64)window_size, trsl_param);
+}
+
+static int starfive_pcie_setup_windows(struct starfive_jh7110_pcie *pcie)
+{
+ struct pci_host_bridge *bridge = pcie->bridge;
+ struct resource_entry *entry;
+ u64 pci_addr;
+
+ resource_list_for_each_entry(entry, &bridge->windows) {
+ if (resource_type(entry->res) == IORESOURCE_MEM) {
+ pci_addr = entry->res->start - entry->offset;
+ starfive_pcie_set_atr_entry(pcie,
+ entry->res->start, pci_addr,
+ resource_size(entry->res),
+ XR3PCI_ATR_TRSLID_PCIE_MEMORY);
+ }
+ }
+
+ return 0;
+}
+
+static int starfive_pcie_clk_rst_init(struct starfive_jh7110_pcie *pcie)
+{
+ int ret;
+ struct device *dev = &pcie->pdev->dev;
+
+ pcie->num_clks = devm_clk_bulk_get_all(dev, &pcie->clks);
+ if (pcie->num_clks < 0)
+ return dev_err_probe(dev, -ENODEV,
+ "Failed to get pcie clocks\n");
+
+ ret = clk_bulk_prepare_enable(pcie->num_clks, pcie->clks);
+ if (ret)
+ return dev_err_probe(&pcie->pdev->dev, ret,
+ "Failed to enable clocks\n");
+
+ pcie->resets = devm_reset_control_array_get_exclusive(dev);
+ if (IS_ERR(pcie->resets)) {
+ clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+ return dev_err_probe(dev, PTR_ERR(pcie->resets),
+ "Failed to get pcie resets");
+ }
+
+ return reset_control_deassert(pcie->resets);
+}
+
+static void starfive_pcie_clk_rst_deinit(struct starfive_jh7110_pcie *pcie)
+{
+ reset_control_assert(pcie->resets);
+ clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+}
+
+int starfive_pcie_gpio_init(struct starfive_jh7110_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+
+ pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR_OR_NULL(pcie->reset_gpio)) {
+ dev_warn(dev, "Failed to get reset-gpio.\n");
+ return -EINVAL;
+ }
+
+ pcie->power_gpio = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
+ if (IS_ERR_OR_NULL(pcie->power_gpio))
+ pcie->power_gpio = NULL;
+
+ return 0;
+}
+
+static void starfive_pcie_hw_init(struct starfive_jh7110_pcie *pcie)
+{
+ unsigned int value;
+ int i;
+
+ if (pcie->power_gpio)
+ gpiod_set_value_cansleep(pcie->power_gpio, 1);
+
+ if (pcie->reset_gpio)
+ gpiod_set_value_cansleep(pcie->reset_gpio, 1);
+
+ /* Disable physical functions except #0 */
+ for (i = 1; i < PCIE_FUNC_NUM; i++) {
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_arfun,
+ STG_SYSCON_AXI4_SLVL_ARFUNC_MASK,
+ (i << PHY_FUNC_SHIFT) <<
+ STG_SYSCON_AXI4_SLVL_ARFUNC_SHIFT);
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_awfun,
+ STG_SYSCON_AXI4_SLVL_AWFUNC_MASK,
+ i << PHY_FUNC_SHIFT);
+
+ value = readl(pcie->reg_base + PCI_MISC);
+ value |= PHY_FUNCTION_DIS;
+ writel(value, pcie->reg_base + PCI_MISC);
+ }
+
+
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_arfun,
+ STG_SYSCON_AXI4_SLVL_ARFUNC_MASK,
+ 0);
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_awfun,
+ STG_SYSCON_AXI4_SLVL_AWFUNC_MASK,
+ 0);
+
+ /* Enable root port */
+ value = readl(pcie->reg_base + GEN_SETTINGS);
+ value |= RP_ENABLE;
+ writel(value, pcie->reg_base + GEN_SETTINGS);
+
+ /* PCIe PCI Standard Configuration Identification Settings. */
+ value = (PCI_CLASS_BRIDGE_PCI << IDS_CLASS_CODE_SHIFT);
+ writel(value, pcie->reg_base + PCIE_PCI_IDS);
+
+ /*
+ * The LTR message forwarding of PCIe Message Reception was set by core
+ * as default, but the forward id & addr are also need to be reset.
+ * If we do not disable LTR message forwarding here, or set a legal
+ * forwarding address, the kernel will get stuck after this driver probe.
+ * To workaround, disable the LTR message forwarding support on
+ * PCIe Message Reception.
+ */
+ value = readl(pcie->reg_base + PMSG_SUPPORT_RX);
+ value &= ~PMSG_LTR_SUPPORT;
+ writel(value, pcie->reg_base + PMSG_SUPPORT_RX);
+
+ /* Prefetchable memory window 64-bit addressing support */
+ value = readl(pcie->reg_base + PCIE_WINROM);
+ value |= PREF_MEM_WIN_64_SUPPORT;
+ writel(value, pcie->reg_base + PCIE_WINROM);
+
+ /*
+ * As the two host bridges in JH7110 soc have the same default
+ * address translation table, this cause the second root port can't
+ * access it's host bridge config space correctly.
+ * To workaround, config the ATR of host bridge config space by SW.
+ */
+ starfive_pcie_set_atr_entry(pcie,
+ pcie->config_phyaddr, 0,
+ XR3PCI_ECAM_SIZE,
+ XR3PCI_ATR_TRSLID_PCIE_CONFIG);
+
+ starfive_pcie_setup_windows(pcie);
+
+ /* Ensure that PERST has been asserted for at least 100 ms */
+ msleep(300);
+ if (pcie->reset_gpio)
+ gpiod_set_value_cansleep(pcie->reset_gpio, 0);
+}
+
+static bool starfive_pcie_is_link_up(struct starfive_jh7110_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ int ret;
+ u32 stg_reg_val;
+
+ /* 100ms timeout value should be enough for Gen1/2 training */
+ ret = regmap_read_poll_timeout(pcie->reg_syscon,
+ pcie->stg_lnksta,
+ stg_reg_val,
+ stg_reg_val & DATA_LINK_ACTIVE,
+ 10 * 1000, 100 * 1000);
+
+ /* If the link is down (no device in slot), then exit. */
+ if (ret == -ETIMEDOUT) {
+ dev_info(dev, "Port link down, exit.\n");
+ return false;
+ } else if (ret == 0) {
+ dev_info(dev, "Port link up.\n");
+ return true;
+ }
+
+ dev_warn(dev, "Read stg_linksta failed.\n");
+
+ return false;
+}
+
+static int starfive_pcie_enable_phy(struct device *dev,
+ struct starfive_jh7110_pcie *pcie)
+{
+ int ret;
+
+ if (!pcie->phy)
+ return 0;
+
+ ret = phy_init(pcie->phy);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to initialize pcie phy\n");
+
+ ret = phy_set_mode(pcie->phy, PHY_MODE_PCIE);
+ if (ret) {
+ ret = dev_err_probe(dev, ret,
+ "failed to set pcie mode\n");
+ goto err_phy_on;
+ }
+
+ ret = phy_power_on(pcie->phy);
+ if (ret) {
+ ret = dev_err_probe(dev, ret, "failed to power on pcie phy\n");
+ goto err_phy_on;
+ }
+
+ return 0;
+
+err_phy_on:
+ phy_exit(pcie->phy);
+ return ret;
+}
+
+static void starfive_pcie_disable_phy(struct starfive_jh7110_pcie *pcie)
+{
+ phy_power_off(pcie->phy);
+ phy_exit(pcie->phy);
+}
+
+static int starfive_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct starfive_jh7110_pcie *pcie;
+ struct pci_bus *bus;
+ struct pci_host_bridge *bridge;
+ int ret;
+
+ pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
+ if (!pcie)
+ return -ENOMEM;
+
+ pcie->pdev = pdev;
+ pcie->atr_table_num = 0;
+
+ ret = starfive_pcie_parse_dt(pcie);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, pcie);
+
+ ret = starfive_pcie_gpio_init(pcie);
+ if (ret)
+ return ret;
+
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_rp_nep,
+ STG_SYSCON_K_RP_NEP,
+ STG_SYSCON_K_RP_NEP);
+
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_awfun,
+ STG_SYSCON_CKREF_SRC_MASK,
+ 2 << STG_SYSCON_CKREF_SRC_SHIFT);
+
+ regmap_update_bits(pcie->reg_syscon,
+ pcie->stg_awfun,
+ STG_SYSCON_CLKREQ,
+ STG_SYSCON_CLKREQ);
+
+ ret = starfive_pcie_clk_rst_init(pcie);
+ if (ret)
+ return ret;
+
+ ret = starfive_pcie_init_irq_domain(pcie);
+ if (ret)
+ return ret;
+
+ bridge = devm_pci_alloc_host_bridge(dev, 0);
+ if (!bridge)
+ return -ENOMEM;
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ /* Set default bus ops */
+ bridge->ops = &starfive_pcie_ops;
+ bridge->sysdata = pcie;
+ pcie->bridge = bridge;
+
+ starfive_pcie_hw_init(pcie);
+
+ if (starfive_pcie_is_link_up(pcie) == false)
+ goto release;
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ ret = starfive_pcie_enable_msi(pcie, bus);
+ if (ret < 0) {
+ dev_err(dev, "Failed to enable MSI support: %d\n", ret);
+ goto release;
+ }
+ }
+
+ ret = starfive_pcie_enable_phy(dev, pcie);
+ if (ret)
+ goto release;
+
+ ret = pci_host_probe(bridge);
+ if (ret < 0) {
+ dev_err_probe(dev, ret, "Failed to pci host probe: %d\n", ret);
+ goto err_phy_on;
+ }
+
+ return ret;
+
+err_phy_on:
+ starfive_pcie_disable_phy(pcie);
+release:
+ if (pcie->power_gpio)
+ gpiod_set_value_cansleep(pcie->power_gpio, 0);
+
+ starfive_pcie_clk_rst_deinit(pcie);
+
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ pci_free_host_bridge(pcie->bridge);
+ platform_set_drvdata(pdev, NULL);
+
+ return ret;
+}
+
+static int starfive_pcie_remove(struct platform_device *pdev)
+{
+ struct starfive_jh7110_pcie *pcie = platform_get_drvdata(pdev);
+
+ starfive_pcie_disable_phy(pcie);
+ if (pcie->power_gpio)
+ gpiod_set_value_cansleep(pcie->power_gpio, 0);
+ starfive_pcie_free_irq_domain(pcie);
+ starfive_pcie_clk_rst_deinit(pcie);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int __maybe_unused starfive_pcie_suspend_noirq(struct device *dev)
+{
+ struct starfive_jh7110_pcie *pcie = dev_get_drvdata(dev);
+
+ if (!pcie)
+ return 0;
+
+ starfive_pcie_disable_phy(pcie);
+ clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+
+ return 0;
+}
+
+static int __maybe_unused starfive_pcie_resume_noirq(struct device *dev)
+{
+ struct starfive_jh7110_pcie *pcie = dev_get_drvdata(dev);
+ int ret;
+
+ if (!pcie)
+ return 0;
+
+ ret = clk_bulk_prepare_enable(pcie->num_clks, pcie->clks);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to enable clocks\n");
+
+ ret = starfive_pcie_enable_phy(dev, pcie);
+ if (ret)
+ clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+
+ return ret;
+}
+
+static const struct dev_pm_ops starfive_pcie_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(starfive_pcie_suspend_noirq,
+ starfive_pcie_resume_noirq)
+};
+#endif
+
+static const struct of_device_id starfive_pcie_of_match[] = {
+ { .compatible = "starfive,jh7110-pcie"},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, starfive_pcie_of_match);
+
+static struct platform_driver starfive_pcie_driver = {
+ .driver = {
+ .name = "pcie-starfive",
+ .of_match_table = of_match_ptr(starfive_pcie_of_match),
+#ifdef CONFIG_PM_SLEEP
+ .pm = &starfive_pcie_pm_ops,
+#endif
+ },
+ .probe = starfive_pcie_probe,
+ .remove = starfive_pcie_remove,
+};
+module_platform_driver(starfive_pcie_driver);
+
+MODULE_DESCRIPTION("StarFive JH7110 PCIe host driver");
+MODULE_AUTHOR("Mason Huo <mason.huo@starfivetech.com>");
+MODULE_AUTHOR("Kevin Xie <kevin.xie@starfivetech.com>");
+MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff