--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe driver for Renesas RZ/G3S SoCs
+ *
+ * Copyright (C) 2025 Renesas Electronics Corp.
+ *
+ * Based on:
+ * drivers/pci/controller/pcie-rcar-host.c
+ * Copyright (C) 2009 - 2011 Paul Mundt
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/cleanup.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/iopoll.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqchip/irq-msi-lib.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mutex.h>
+#include <linux/msi.h>
+#include <linux/of_irq.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/units.h>
+
+#include "../pci.h"
+
+/* AXI registers */
+#define RZG3S_PCI_REQDATA(id) (0x80 + (id) * 0x4)
+#define RZG3S_PCI_REQRCVDAT 0x8c
+
+#define RZG3S_PCI_REQADR1 0x90
+#define RZG3S_PCI_REQADR1_BUS GENMASK(31, 24)
+#define RZG3S_PCI_REQADR1_DEV GENMASK(23, 19)
+#define RZG3S_PCI_REQADR1_FUNC GENMASK(18, 16)
+#define RZG3S_PCI_REQADR1_REG GENMASK(11, 0)
+
+#define RZG3S_PCI_REQBE 0x98
+#define RZG3S_PCI_REQBE_BYTE_EN GENMASK(3, 0)
+
+#define RZG3S_PCI_REQISS 0x9c
+#define RZG3S_PCI_REQISS_MOR_STATUS GENMASK(18, 16)
+#define RZG3S_PCI_REQISS_TR_TYPE GENMASK(11, 8)
+#define RZG3S_PCI_REQISS_TR_TP0_RD FIELD_PREP(RZG3S_PCI_REQISS_TR_TYPE, 0x4)
+#define RZG3S_PCI_REQISS_TR_TP0_WR FIELD_PREP(RZG3S_PCI_REQISS_TR_TYPE, 0x5)
+#define RZG3S_PCI_REQISS_TR_TP1_RD FIELD_PREP(RZG3S_PCI_REQISS_TR_TYPE, 0x6)
+#define RZG3S_PCI_REQISS_TR_TP1_WR FIELD_PREP(RZG3S_PCI_REQISS_TR_TYPE, 0x7)
+#define RZG3S_PCI_REQISS_REQ_ISSUE BIT(0)
+
+#define RZG3S_PCI_MSIRCVWADRL 0x100
+#define RZG3S_PCI_MSIRCVWADRL_MASK GENMASK(31, 3)
+#define RZG3S_PCI_MSIRCVWADRL_MSG_DATA_ENA BIT(1)
+#define RZG3S_PCI_MSIRCVWADRL_ENA BIT(0)
+
+#define RZG3S_PCI_MSIRCVWADRU 0x104
+
+#define RZG3S_PCI_MSIRCVWMSKL 0x108
+#define RZG3S_PCI_MSIRCVWMSKL_MASK GENMASK(31, 2)
+
+#define RZG3S_PCI_PINTRCVIE 0x110
+#define RZG3S_PCI_PINTRCVIE_INTX(i) BIT(i)
+#define RZG3S_PCI_PINTRCVIE_MSI BIT(4)
+
+#define RZG3S_PCI_PINTRCVIS 0x114
+#define RZG3S_PCI_PINTRCVIS_INTX(i) BIT(i)
+#define RZG3S_PCI_PINTRCVIS_MSI BIT(4)
+
+#define RZG3S_PCI_MSGRCVIE 0x120
+#define RZG3S_PCI_MSGRCVIE_MSG_RCV BIT(24)
+
+#define RZG3S_PCI_MSGRCVIS 0x124
+#define RZG3S_PCI_MSGRCVIS_MRI BIT(24)
+
+#define RZG3S_PCI_PEIE0 0x200
+
+#define RZG3S_PCI_PEIS0 0x204
+#define RZG3S_PCI_PEIS0_RX_DLLP_PM_ENTER BIT(12)
+#define RZG3S_PCI_PEIS0_DL_UPDOWN BIT(9)
+
+#define RZG3S_PCI_PEIE1 0x208
+#define RZG3S_PCI_PEIS1 0x20c
+#define RZG3S_PCI_AMEIS 0x214
+#define RZG3S_PCI_ASEIS1 0x224
+
+#define RZG3S_PCI_PCSTAT1 0x408
+#define RZG3S_PCI_PCSTAT1_LTSSM_STATE GENMASK(14, 10)
+#define RZG3S_PCI_PCSTAT1_DL_DOWN_STS BIT(0)
+
+#define RZG3S_PCI_PCCTRL2 0x410
+#define RZG3S_PCI_PCCTRL2_LS_CHG GENMASK(9, 8)
+#define RZG3S_PCI_PCCTRL2_LS_CHG_REQ BIT(0)
+
+#define RZG3S_PCI_PCSTAT2 0x414
+#define RZG3S_PCI_PCSTAT2_LS_CHG_DONE BIT(28)
+#define RZG3S_PCI_PCSTAT2_SDRIRE GENMASK(7, 1)
+
+#define RZG3S_PCI_PERM 0x300
+#define RZG3S_PCI_PERM_CFG_HWINIT_EN BIT(2)
+#define RZG3S_PCI_PERM_PIPE_PHY_REG_EN BIT(1)
+
+#define RZG3S_PCI_MSIRE(id) (0x600 + (id) * 0x10)
+#define RZG3S_PCI_MSIRE_ENA BIT(0)
+
+#define RZG3S_PCI_MSIRM(id) (0x608 + (id) * 0x10)
+#define RZG3S_PCI_MSIRS(id) (0x60c + (id) * 0x10)
+
+#define RZG3S_PCI_AWBASEL(id) (0x1000 + (id) * 0x20)
+#define RZG3S_PCI_AWBASEL_WIN_ENA BIT(0)
+
+#define RZG3S_PCI_AWBASEU(id) (0x1004 + (id) * 0x20)
+#define RZG3S_PCI_AWMASKL(id) (0x1008 + (id) * 0x20)
+#define RZG3S_PCI_AWMASKU(id) (0x100c + (id) * 0x20)
+#define RZG3S_PCI_ADESTL(id) (0x1010 + (id) * 0x20)
+#define RZG3S_PCI_ADESTU(id) (0x1014 + (id) * 0x20)
+
+#define RZG3S_PCI_PWBASEL(id) (0x1100 + (id) * 0x20)
+#define RZG3S_PCI_PWBASEL_ENA BIT(0)
+
+#define RZG3S_PCI_PWBASEU(id) (0x1104 + (id) * 0x20)
+#define RZG3S_PCI_PDESTL(id) (0x1110 + (id) * 0x20)
+#define RZG3S_PCI_PDESTU(id) (0x1114 + (id) * 0x20)
+#define RZG3S_PCI_PWMASKL(id) (0x1108 + (id) * 0x20)
+#define RZG3S_PCI_PWMASKU(id) (0x110c + (id) * 0x20)
+
+/* PHY control registers */
+#define RZG3S_PCI_PHY_XCFGD(id) (0x2000 + (id) * 0x10)
+#define RZG3S_PCI_PHY_XCFGD_NUM 39
+
+#define RZG3S_PCI_PHY_XCFGA_CMN(id) (0x2400 + (id) * 0x10)
+#define RZG3S_PCI_PHY_XCFGA_CMN_NUM 16
+
+#define RZG3S_PCI_PHY_XCFGA_RX(id) (0x2500 + (id) * 0x10)
+#define RZG3S_PCI_PHY_XCFGA_RX_NUM 13
+
+#define RZG3S_PCI_PHY_XCFGA_TX 0x25d0
+
+#define RZG3S_PCI_PHY_XCFG_CTRL 0x2a20
+#define RZG3S_PCI_PHY_XCFG_CTRL_PHYREG_SEL BIT(0)
+
+/* PCIe registers */
+#define RZG3S_PCI_CFG_BASE 0x6000
+#define RZG3S_PCI_CFG_BARMSK00L 0xa0
+#define RZG3S_PCI_CFG_BARMSK00U 0xa4
+
+#define RZG3S_PCI_CFG_PCIEC 0x60
+
+/* System controller registers */
+#define RZG3S_SYS_PCIE_RST_RSM_B 0xd74
+#define RZG3S_SYS_PCIE_RST_RSM_B_MASK BIT(0)
+
+/* Maximum number of windows */
+#define RZG3S_MAX_WINDOWS 8
+
+/* Number of MSI interrupts per register */
+#define RZG3S_PCI_MSI_INT_PER_REG 32
+/* The number of MSI interrupts */
+#define RZG3S_PCI_MSI_INT_NR RZG3S_PCI_MSI_INT_PER_REG
+
+/* Timeouts experimentally determined */
+#define RZG3S_REQ_ISSUE_TIMEOUT_US 2500
+
+/**
+ * struct rzg3s_pcie_msi - RZ/G3S PCIe MSI data structure
+ * @domain: IRQ domain
+ * @map: bitmap with the allocated MSIs
+ * @dma_addr: address of the allocated MSI window
+ * @window_base: base address of the MSI window
+ * @pages: allocated pages for MSI window mapping
+ * @map_lock: lock for bitmap with the allocated MSIs
+ * @irq: MSI interrupt
+ */
+struct rzg3s_pcie_msi {
+ struct irq_domain *domain;
+ DECLARE_BITMAP(map, RZG3S_PCI_MSI_INT_NR);
+ dma_addr_t dma_addr;
+ dma_addr_t window_base;
+ unsigned long pages;
+ struct mutex map_lock;
+ int irq;
+};
+
+struct rzg3s_pcie_host;
+
+/**
+ * struct rzg3s_pcie_soc_data - SoC specific data
+ * @init_phy: PHY initialization function
+ * @power_resets: array with the resets that need to be de-asserted after
+ * power-on
+ * @cfg_resets: array with the resets that need to be de-asserted after
+ * configuration
+ * @num_power_resets: number of power resets
+ * @num_cfg_resets: number of configuration resets
+ */
+struct rzg3s_pcie_soc_data {
+ int (*init_phy)(struct rzg3s_pcie_host *host);
+ const char * const *power_resets;
+ const char * const *cfg_resets;
+ u8 num_power_resets;
+ u8 num_cfg_resets;
+};
+
+/**
+ * struct rzg3s_pcie_port - RZ/G3S PCIe Root Port data structure
+ * @refclk: PCIe reference clock
+ * @vendor_id: Vendor ID
+ * @device_id: Device ID
+ */
+struct rzg3s_pcie_port {
+ struct clk *refclk;
+ u32 vendor_id;
+ u32 device_id;
+};
+
+/**
+ * struct rzg3s_pcie_host - RZ/G3S PCIe data structure
+ * @axi: base address for AXI registers
+ * @pcie: base address for PCIe registers
+ * @dev: struct device
+ * @power_resets: reset control signals that should be set after power up
+ * @cfg_resets: reset control signals that should be set after configuration
+ * @sysc: SYSC regmap
+ * @intx_domain: INTx IRQ domain
+ * @data: SoC specific data
+ * @msi: MSI data structure
+ * @port: PCIe Root Port
+ * @hw_lock: lock for access to the HW resources
+ * @intx_irqs: INTx interrupts
+ * @max_link_speed: maximum supported link speed
+ */
+struct rzg3s_pcie_host {
+ void __iomem *axi;
+ void __iomem *pcie;
+ struct device *dev;
+ struct reset_control_bulk_data *power_resets;
+ struct reset_control_bulk_data *cfg_resets;
+ struct regmap *sysc;
+ struct irq_domain *intx_domain;
+ const struct rzg3s_pcie_soc_data *data;
+ struct rzg3s_pcie_msi msi;
+ struct rzg3s_pcie_port port;
+ raw_spinlock_t hw_lock;
+ int intx_irqs[PCI_NUM_INTX];
+ int max_link_speed;
+};
+
+#define rzg3s_msi_to_host(_msi) container_of(_msi, struct rzg3s_pcie_host, msi)
+
+static void rzg3s_pcie_update_bits(void __iomem *base, u32 offset, u32 mask,
+ u32 val)
+{
+ u32 tmp;
+
+ tmp = readl_relaxed(base + offset);
+ tmp &= ~mask;
+ tmp |= val & mask;
+ writel_relaxed(tmp, base + offset);
+}
+
+static int rzg3s_pcie_child_issue_request(struct rzg3s_pcie_host *host)
+{
+ u32 val;
+ int ret;
+
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_REQISS,
+ RZG3S_PCI_REQISS_REQ_ISSUE,
+ RZG3S_PCI_REQISS_REQ_ISSUE);
+ ret = readl_poll_timeout_atomic(host->axi + RZG3S_PCI_REQISS, val,
+ !(val & RZG3S_PCI_REQISS_REQ_ISSUE),
+ 5, RZG3S_REQ_ISSUE_TIMEOUT_US);
+
+ if (val & RZG3S_PCI_REQISS_MOR_STATUS)
+ return -EIO;
+
+ return ret;
+}
+
+static void rzg3s_pcie_child_prepare_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct rzg3s_pcie_host *host = bus->sysdata;
+ unsigned int dev, func, reg;
+
+ dev = PCI_SLOT(devfn);
+ func = PCI_FUNC(devfn);
+ reg = where & ~0x3;
+
+ /* Set the destination */
+ writel_relaxed(FIELD_PREP(RZG3S_PCI_REQADR1_BUS, bus->number) |
+ FIELD_PREP(RZG3S_PCI_REQADR1_DEV, dev) |
+ FIELD_PREP(RZG3S_PCI_REQADR1_FUNC, func) |
+ FIELD_PREP(RZG3S_PCI_REQADR1_REG, reg),
+ host->axi + RZG3S_PCI_REQADR1);
+
+ /* Set byte enable */
+ writel_relaxed(RZG3S_PCI_REQBE_BYTE_EN, host->axi + RZG3S_PCI_REQBE);
+}
+
+static int rzg3s_pcie_child_read_conf(struct rzg3s_pcie_host *host,
+ struct pci_bus *bus, unsigned int devfn,
+ int where, u32 *data)
+{
+ bool type0 = pci_is_root_bus(bus->parent) ? true : false;
+ int ret;
+
+ rzg3s_pcie_child_prepare_bus(bus, devfn, where);
+
+ /* Set the type of request */
+ writel_relaxed(type0 ? RZG3S_PCI_REQISS_TR_TP0_RD :
+ RZG3S_PCI_REQISS_TR_TP1_RD,
+ host->axi + RZG3S_PCI_REQISS);
+
+ /* Issue the request and wait to finish */
+ ret = rzg3s_pcie_child_issue_request(host);
+ if (ret)
+ return PCIBIOS_SET_FAILED;
+
+ /* Read the data */
+ *data = readl_relaxed(host->axi + RZG3S_PCI_REQRCVDAT);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
+static int rzg3s_pcie_child_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ struct rzg3s_pcie_host *host = bus->sysdata;
+ int ret;
+
+ ret = rzg3s_pcie_child_read_conf(host, bus, devfn, where, val);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ if (size <= 2)
+ *val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int rzg3s_pcie_child_write_conf(struct rzg3s_pcie_host *host,
+ struct pci_bus *bus, unsigned int devfn,
+ int where, u32 data)
+{
+ bool type0 = pci_is_root_bus(bus->parent) ? true : false;
+ int ret;
+
+ rzg3s_pcie_child_prepare_bus(bus, devfn, where);
+
+ /* Set the write data */
+ writel_relaxed(0, host->axi + RZG3S_PCI_REQDATA(0));
+ writel_relaxed(0, host->axi + RZG3S_PCI_REQDATA(1));
+ writel_relaxed(data, host->axi + RZG3S_PCI_REQDATA(2));
+
+ /* Set the type of request */
+ writel_relaxed(type0 ? RZG3S_PCI_REQISS_TR_TP0_WR :
+ RZG3S_PCI_REQISS_TR_TP1_WR,
+ host->axi + RZG3S_PCI_REQISS);
+
+ /* Issue the request and wait to finish */
+ ret = rzg3s_pcie_child_issue_request(host);
+ if (ret)
+ return PCIBIOS_SET_FAILED;
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
+static int rzg3s_pcie_child_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ struct rzg3s_pcie_host *host = bus->sysdata;
+ u32 data, shift;
+ int ret;
+
+ if (size == 4)
+ return rzg3s_pcie_child_write_conf(host, bus, devfn, where, val);
+
+ /*
+ * Controller does 32 bit accesses. To do byte accesses software need
+ * to do read/modify/write. This may have potential side effects. For
+ * example, software may perform a 16-bit write. If the hardware only
+ * supports 32-bit accesses, we must do a 32-bit read, merge in the 16
+ * bits we intend to write, followed by a 32-bit write. If the 16 bits
+ * we *don't* intend to write happen to have any RW1C
+ * (write-one-to-clear) bits set, we just inadvertently cleared
+ * something we shouldn't have.
+ */
+ if (!bus->unsafe_warn) {
+ dev_warn(&bus->dev, "%d-byte config write to %04x:%02x:%02x.%d offset %#x may corrupt adjacent RW1C bits\n",
+ size, pci_domain_nr(bus), bus->number,
+ PCI_SLOT(devfn), PCI_FUNC(devfn), where);
+ bus->unsafe_warn = 1;
+ }
+
+ ret = rzg3s_pcie_child_read_conf(host, bus, devfn, where, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ if (size == 1) {
+ shift = BITS_PER_BYTE * (where & 3);
+ data &= ~(0xff << shift);
+ data |= ((val & 0xff) << shift);
+ } else if (size == 2) {
+ shift = BITS_PER_BYTE * (where & 2);
+ data &= ~(0xffff << shift);
+ data |= ((val & 0xffff) << shift);
+ } else {
+ data = val;
+ }
+
+ return rzg3s_pcie_child_write_conf(host, bus, devfn, where, data);
+}
+
+static struct pci_ops rzg3s_pcie_child_ops = {
+ .read = rzg3s_pcie_child_read,
+ .write = rzg3s_pcie_child_write,
+};
+
+static void __iomem *rzg3s_pcie_root_map_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct rzg3s_pcie_host *host = bus->sysdata;
+
+ if (devfn)
+ return NULL;
+
+ return host->pcie + where;
+}
+
+/* Serialized by 'pci_lock' */
+static int rzg3s_pcie_root_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ struct rzg3s_pcie_host *host = bus->sysdata;
+ int ret;
+
+ /* Enable access control to the CFGU */
+ writel_relaxed(RZG3S_PCI_PERM_CFG_HWINIT_EN,
+ host->axi + RZG3S_PCI_PERM);
+
+ ret = pci_generic_config_write(bus, devfn, where, size, val);
+
+ /* Disable access control to the CFGU */
+ writel_relaxed(0, host->axi + RZG3S_PCI_PERM);
+
+ return ret;
+}
+
+static struct pci_ops rzg3s_pcie_root_ops = {
+ .read = pci_generic_config_read,
+ .write = rzg3s_pcie_root_write,
+ .map_bus = rzg3s_pcie_root_map_bus,
+};
+
+static void rzg3s_pcie_intx_irq_handler(struct irq_desc *desc)
+{
+ struct rzg3s_pcie_host *host = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ unsigned int irq = irq_desc_get_irq(desc);
+ u32 intx = irq - host->intx_irqs[0];
+
+ chained_irq_enter(chip, desc);
+ generic_handle_domain_irq(host->intx_domain, intx);
+ chained_irq_exit(chip, desc);
+}
+
+static irqreturn_t rzg3s_pcie_msi_irq(int irq, void *data)
+{
+ u8 regs = RZG3S_PCI_MSI_INT_NR / RZG3S_PCI_MSI_INT_PER_REG;
+ DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR);
+ struct rzg3s_pcie_host *host = data;
+ struct rzg3s_pcie_msi *msi = &host->msi;
+ unsigned long bit;
+ u32 status;
+
+ status = readl_relaxed(host->axi + RZG3S_PCI_PINTRCVIS);
+ if (!(status & RZG3S_PCI_PINTRCVIS_MSI))
+ return IRQ_NONE;
+
+ /* Clear the MSI */
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PINTRCVIS,
+ RZG3S_PCI_PINTRCVIS_MSI,
+ RZG3S_PCI_PINTRCVIS_MSI);
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_MSGRCVIS,
+ RZG3S_PCI_MSGRCVIS_MRI, RZG3S_PCI_MSGRCVIS_MRI);
+
+ for (u8 reg_id = 0; reg_id < regs; reg_id++) {
+ status = readl_relaxed(host->axi + RZG3S_PCI_MSIRS(reg_id));
+ bitmap_write(bitmap, status, reg_id * RZG3S_PCI_MSI_INT_PER_REG,
+ RZG3S_PCI_MSI_INT_PER_REG);
+ }
+
+ for_each_set_bit(bit, bitmap, RZG3S_PCI_MSI_INT_NR) {
+ int ret;
+
+ ret = generic_handle_domain_irq(msi->domain, bit);
+ if (ret) {
+ u8 reg_bit = bit % RZG3S_PCI_MSI_INT_PER_REG;
+ u8 reg_id = bit / RZG3S_PCI_MSI_INT_PER_REG;
+
+ /* Unknown MSI, just clear it */
+ writel_relaxed(BIT(reg_bit),
+ host->axi + RZG3S_PCI_MSIRS(reg_id));
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void rzg3s_pcie_msi_irq_ack(struct irq_data *d)
+{
+ struct rzg3s_pcie_msi *msi = irq_data_get_irq_chip_data(d);
+ struct rzg3s_pcie_host *host = rzg3s_msi_to_host(msi);
+ u8 reg_bit = d->hwirq % RZG3S_PCI_MSI_INT_PER_REG;
+ u8 reg_id = d->hwirq / RZG3S_PCI_MSI_INT_PER_REG;
+
+ guard(raw_spinlock_irqsave)(&host->hw_lock);
+
+ writel_relaxed(BIT(reg_bit), host->axi + RZG3S_PCI_MSIRS(reg_id));
+}
+
+static void rzg3s_pcie_msi_irq_mask(struct irq_data *d)
+{
+ struct rzg3s_pcie_msi *msi = irq_data_get_irq_chip_data(d);
+ struct rzg3s_pcie_host *host = rzg3s_msi_to_host(msi);
+ u8 reg_bit = d->hwirq % RZG3S_PCI_MSI_INT_PER_REG;
+ u8 reg_id = d->hwirq / RZG3S_PCI_MSI_INT_PER_REG;
+
+ guard(raw_spinlock_irqsave)(&host->hw_lock);
+
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_MSIRM(reg_id), BIT(reg_bit),
+ BIT(reg_bit));
+}
+
+static void rzg3s_pcie_msi_irq_unmask(struct irq_data *d)
+{
+ struct rzg3s_pcie_msi *msi = irq_data_get_irq_chip_data(d);
+ struct rzg3s_pcie_host *host = rzg3s_msi_to_host(msi);
+ u8 reg_bit = d->hwirq % RZG3S_PCI_MSI_INT_PER_REG;
+ u8 reg_id = d->hwirq / RZG3S_PCI_MSI_INT_PER_REG;
+
+ guard(raw_spinlock_irqsave)(&host->hw_lock);
+
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_MSIRM(reg_id), BIT(reg_bit),
+ 0);
+}
+
+static void rzg3s_pcie_irq_compose_msi_msg(struct irq_data *data,
+ struct msi_msg *msg)
+{
+ struct rzg3s_pcie_msi *msi = irq_data_get_irq_chip_data(data);
+ struct rzg3s_pcie_host *host = rzg3s_msi_to_host(msi);
+ u32 lo, hi;
+
+ /*
+ * Enable and msg data enable bits are part of the address lo. Drop
+ * them along with the unused bit.
+ */
+ lo = readl_relaxed(host->axi + RZG3S_PCI_MSIRCVWADRL) &
+ RZG3S_PCI_MSIRCVWADRL_MASK;
+ hi = readl_relaxed(host->axi + RZG3S_PCI_MSIRCVWADRU);
+
+ msg->address_lo = lo;
+ msg->address_hi = hi;
+ msg->data = data->hwirq;
+}
+
+static struct irq_chip rzg3s_pcie_msi_bottom_chip = {
+ .name = "rzg3s-pcie-msi",
+ .irq_ack = rzg3s_pcie_msi_irq_ack,
+ .irq_mask = rzg3s_pcie_msi_irq_mask,
+ .irq_unmask = rzg3s_pcie_msi_irq_unmask,
+ .irq_compose_msi_msg = rzg3s_pcie_irq_compose_msi_msg,
+};
+
+static int rzg3s_pcie_msi_domain_alloc(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs,
+ void *args)
+{
+ struct rzg3s_pcie_msi *msi = domain->host_data;
+ int hwirq;
+
+ scoped_guard(mutex, &msi->map_lock) {
+ hwirq = bitmap_find_free_region(msi->map, RZG3S_PCI_MSI_INT_NR,
+ order_base_2(nr_irqs));
+ }
+
+ if (hwirq < 0)
+ return -ENOSPC;
+
+ for (unsigned int i = 0; i < nr_irqs; i++) {
+ irq_domain_set_info(domain, virq + i, hwirq + i,
+ &rzg3s_pcie_msi_bottom_chip,
+ domain->host_data, handle_edge_irq, NULL,
+ NULL);
+ }
+
+ return 0;
+}
+
+static void rzg3s_pcie_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 rzg3s_pcie_msi *msi = domain->host_data;
+
+ guard(mutex)(&msi->map_lock);
+
+ bitmap_release_region(msi->map, d->hwirq, order_base_2(nr_irqs));
+}
+
+static const struct irq_domain_ops rzg3s_pcie_msi_domain_ops = {
+ .alloc = rzg3s_pcie_msi_domain_alloc,
+ .free = rzg3s_pcie_msi_domain_free,
+};
+
+#define RZG3S_PCIE_MSI_FLAGS_REQUIRED (MSI_FLAG_USE_DEF_DOM_OPS | \
+ MSI_FLAG_USE_DEF_CHIP_OPS | \
+ MSI_FLAG_NO_AFFINITY | \
+ MSI_FLAG_PCI_MSI_MASK_PARENT)
+
+#define RZG3S_PCIE_MSI_FLAGS_SUPPORTED (MSI_FLAG_MULTI_PCI_MSI | \
+ MSI_GENERIC_FLAGS_MASK)
+
+static const struct msi_parent_ops rzg3s_pcie_msi_parent_ops = {
+ .required_flags = RZG3S_PCIE_MSI_FLAGS_REQUIRED,
+ .supported_flags = RZG3S_PCIE_MSI_FLAGS_SUPPORTED,
+ .bus_select_token = DOMAIN_BUS_PCI_MSI,
+ .chip_flags = MSI_CHIP_FLAG_SET_ACK,
+ .prefix = "RZG3S-",
+ .init_dev_msi_info = msi_lib_init_dev_msi_info,
+};
+
+static int rzg3s_pcie_msi_allocate_domains(struct rzg3s_pcie_msi *msi)
+{
+ struct rzg3s_pcie_host *host = rzg3s_msi_to_host(msi);
+ struct device *dev = host->dev;
+ struct irq_domain_info info = {
+ .fwnode = dev_fwnode(dev),
+ .ops = &rzg3s_pcie_msi_domain_ops,
+ .size = RZG3S_PCI_MSI_INT_NR,
+ .host_data = msi,
+ };
+
+ msi->domain = msi_create_parent_irq_domain(&info,
+ &rzg3s_pcie_msi_parent_ops);
+ if (!msi->domain)
+ return dev_err_probe(dev, -ENOMEM,
+ "failed to create IRQ domain\n");
+
+ return 0;
+}
+
+static int rzg3s_pcie_msi_hw_setup(struct rzg3s_pcie_host *host)
+{
+ u8 regs = RZG3S_PCI_MSI_INT_NR / RZG3S_PCI_MSI_INT_PER_REG;
+ struct rzg3s_pcie_msi *msi = &host->msi;
+
+ /*
+ * Set MSI window size. HW will set the window to
+ * RZG3S_PCI_MSI_INT_NR * 4 bytes.
+ */
+ writel_relaxed(FIELD_PREP(RZG3S_PCI_MSIRCVWMSKL_MASK,
+ RZG3S_PCI_MSI_INT_NR - 1),
+ host->axi + RZG3S_PCI_MSIRCVWMSKL);
+
+ /* Set MSI window address and enable MSI window */
+ writel_relaxed(upper_32_bits(msi->window_base),
+ host->axi + RZG3S_PCI_MSIRCVWADRU);
+ writel_relaxed(lower_32_bits(msi->window_base) |
+ RZG3S_PCI_MSIRCVWADRL_ENA |
+ RZG3S_PCI_MSIRCVWADRL_MSG_DATA_ENA,
+ host->axi + RZG3S_PCI_MSIRCVWADRL);
+
+ /* Set MSI receive enable */
+ for (u8 reg_id = 0; reg_id < regs; reg_id++) {
+ writel_relaxed(RZG3S_PCI_MSIRE_ENA,
+ host->axi + RZG3S_PCI_MSIRE(reg_id));
+ }
+
+ /* Enable message receive interrupts */
+ writel_relaxed(RZG3S_PCI_MSGRCVIE_MSG_RCV,
+ host->axi + RZG3S_PCI_MSGRCVIE);
+
+ /* Enable MSI */
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PINTRCVIE,
+ RZG3S_PCI_PINTRCVIE_MSI,
+ RZG3S_PCI_PINTRCVIE_MSI);
+
+ return 0;
+}
+
+static int rzg3s_pcie_msi_setup(struct rzg3s_pcie_host *host)
+{
+ size_t size = RZG3S_PCI_MSI_INT_NR * sizeof(u32);
+ struct rzg3s_pcie_msi *msi = &host->msi;
+ struct device *dev = host->dev;
+ int id, ret;
+
+ msi->pages = __get_free_pages(GFP_KERNEL | GFP_DMA, 0);
+ if (!msi->pages)
+ return -ENOMEM;
+
+ msi->dma_addr = dma_map_single(dev, (void *)msi->pages, size * 2,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(dev, msi->dma_addr)) {
+ ret = -ENOMEM;
+ goto free_pages;
+ }
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10, section 34.4.5.2 Setting
+ * the MSI Window) the MSI window needs to fall within one of the
+ * enabled AXI windows. Find an enabled AXI window to setup the MSI
+ * window.
+ */
+ for (id = 0; id < RZG3S_MAX_WINDOWS; id++) {
+ u64 base, basel, baseu;
+ u64 mask, maskl, masku;
+
+ basel = readl_relaxed(host->axi + RZG3S_PCI_AWBASEL(id));
+ /* Skip checking this AXI window if it's not enabled */
+ if (!(basel & RZG3S_PCI_AWBASEL_WIN_ENA))
+ continue;
+
+ baseu = readl_relaxed(host->axi + RZG3S_PCI_AWBASEU(id));
+ base = baseu << 32 | basel;
+
+ maskl = readl_relaxed(host->axi + RZG3S_PCI_AWMASKL(id));
+ masku = readl_relaxed(host->axi + RZG3S_PCI_AWMASKU(id));
+ mask = masku << 32 | maskl;
+
+ if (msi->dma_addr < base || msi->dma_addr > base + mask)
+ continue;
+
+ break;
+ }
+
+ if (id == RZG3S_MAX_WINDOWS) {
+ ret = -EINVAL;
+ goto dma_unmap;
+ }
+
+ /* The MSI base address must be aligned to the MSI size */
+ msi->window_base = ALIGN(msi->dma_addr, size);
+ if (msi->window_base < msi->dma_addr) {
+ ret = -EINVAL;
+ goto dma_unmap;
+ }
+
+ rzg3s_pcie_msi_hw_setup(host);
+
+ return 0;
+
+dma_unmap:
+ dma_unmap_single(dev, msi->dma_addr, size * 2, DMA_BIDIRECTIONAL);
+free_pages:
+ free_pages(msi->pages, 0);
+ return ret;
+}
+
+static void rzg3s_pcie_msi_hw_teardown(struct rzg3s_pcie_host *host)
+{
+ u8 regs = RZG3S_PCI_MSI_INT_NR / RZG3S_PCI_MSI_INT_PER_REG;
+
+ /* Disable MSI */
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PINTRCVIE,
+ RZG3S_PCI_PINTRCVIE_MSI, 0);
+
+ /* Disable message receive interrupts */
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_MSGRCVIE,
+ RZG3S_PCI_MSGRCVIE_MSG_RCV, 0);
+
+ /* Disable MSI receive enable */
+ for (u8 reg_id = 0; reg_id < regs; reg_id++)
+ writel_relaxed(0, host->axi + RZG3S_PCI_MSIRE(reg_id));
+
+ /* Disable MSI window */
+ writel_relaxed(0, host->axi + RZG3S_PCI_MSIRCVWADRL);
+}
+
+static void rzg3s_pcie_teardown_msi(struct rzg3s_pcie_host *host)
+{
+ size_t size = RZG3S_PCI_MSI_INT_NR * sizeof(u32);
+ struct rzg3s_pcie_msi *msi = &host->msi;
+
+ rzg3s_pcie_msi_hw_teardown(host);
+
+ free_irq(msi->irq, host);
+ irq_domain_remove(msi->domain);
+
+ /* Free unused memory */
+ dma_unmap_single(host->dev, msi->dma_addr, size * 2, DMA_BIDIRECTIONAL);
+ free_pages(msi->pages, 0);
+}
+
+static int rzg3s_pcie_init_msi(struct rzg3s_pcie_host *host)
+{
+ struct platform_device *pdev = to_platform_device(host->dev);
+ struct rzg3s_pcie_msi *msi = &host->msi;
+ struct device *dev = host->dev;
+ const char *devname;
+ int ret;
+
+ ret = devm_mutex_init(dev, &msi->map_lock);
+ if (ret)
+ return ret;
+
+ msi->irq = platform_get_irq_byname(pdev, "msi");
+ if (msi->irq < 0)
+ return dev_err_probe(dev, msi->irq, "Failed to get MSI IRQ!\n");
+
+ devname = devm_kasprintf(dev, GFP_KERNEL, "%s-msi", dev_name(dev));
+ if (!devname)
+ return -ENOMEM;
+
+ ret = rzg3s_pcie_msi_allocate_domains(msi);
+ if (ret)
+ return ret;
+
+ /*
+ * Don't use devm_request_irq() as the driver uses non-devm helpers
+ * to control clocks. Mixing them may lead to subtle bugs.
+ */
+ ret = request_irq(msi->irq, rzg3s_pcie_msi_irq, 0, devname, host);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to request IRQ: %d\n", ret);
+ goto free_domains;
+ }
+
+ ret = rzg3s_pcie_msi_setup(host);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to setup MSI!\n");
+ goto free_irq;
+ }
+
+ return 0;
+
+free_irq:
+ free_irq(msi->irq, host);
+free_domains:
+ irq_domain_remove(msi->domain);
+ return ret;
+}
+
+static void rzg3s_pcie_intx_irq_ack(struct irq_data *d)
+{
+ struct rzg3s_pcie_host *host = irq_data_get_irq_chip_data(d);
+
+ guard(raw_spinlock_irqsave)(&host->hw_lock);
+
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PINTRCVIS,
+ RZG3S_PCI_PINTRCVIS_INTX(d->hwirq),
+ RZG3S_PCI_PINTRCVIS_INTX(d->hwirq));
+}
+
+static void rzg3s_pcie_intx_irq_mask(struct irq_data *d)
+{
+ struct rzg3s_pcie_host *host = irq_data_get_irq_chip_data(d);
+
+ guard(raw_spinlock_irqsave)(&host->hw_lock);
+
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PINTRCVIE,
+ RZG3S_PCI_PINTRCVIE_INTX(d->hwirq), 0);
+}
+
+static void rzg3s_pcie_intx_irq_unmask(struct irq_data *d)
+{
+ struct rzg3s_pcie_host *host = irq_data_get_irq_chip_data(d);
+
+ guard(raw_spinlock_irqsave)(&host->hw_lock);
+
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PINTRCVIE,
+ RZG3S_PCI_PINTRCVIE_INTX(d->hwirq),
+ RZG3S_PCI_PINTRCVIE_INTX(d->hwirq));
+}
+
+static struct irq_chip rzg3s_pcie_intx_irq_chip = {
+ .name = "PCIe INTx",
+ .irq_ack = rzg3s_pcie_intx_irq_ack,
+ .irq_mask = rzg3s_pcie_intx_irq_mask,
+ .irq_unmask = rzg3s_pcie_intx_irq_unmask,
+};
+
+static int rzg3s_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &rzg3s_pcie_intx_irq_chip,
+ handle_level_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops rzg3s_pcie_intx_domain_ops = {
+ .map = rzg3s_pcie_intx_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+static int rzg3s_pcie_init_irqdomain(struct rzg3s_pcie_host *host)
+{
+ struct device *dev = host->dev;
+ struct platform_device *pdev = to_platform_device(dev);
+
+ for (int i = 0; i < PCI_NUM_INTX; i++) {
+ char irq_name[5] = {0};
+ int irq;
+
+ scnprintf(irq_name, ARRAY_SIZE(irq_name), "int%c", 'a' + i);
+
+ irq = platform_get_irq_byname(pdev, irq_name);
+ if (irq < 0)
+ return dev_err_probe(dev, -EINVAL,
+ "Failed to parse and map INT%c IRQ\n",
+ 'A' + i);
+
+ host->intx_irqs[i] = irq;
+ irq_set_chained_handler_and_data(irq,
+ rzg3s_pcie_intx_irq_handler,
+ host);
+ }
+
+ host->intx_domain = irq_domain_create_linear(dev_fwnode(dev),
+ PCI_NUM_INTX,
+ &rzg3s_pcie_intx_domain_ops,
+ host);
+ if (!host->intx_domain)
+ return dev_err_probe(dev, -EINVAL,
+ "Failed to add irq domain for INTx IRQs\n");
+ irq_domain_update_bus_token(host->intx_domain, DOMAIN_BUS_WIRED);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ int ret = rzg3s_pcie_init_msi(host);
+
+ if (ret) {
+ irq_domain_remove(host->intx_domain);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void rzg3s_pcie_teardown_irqdomain(struct rzg3s_pcie_host *host)
+{
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ rzg3s_pcie_teardown_msi(host);
+
+ irq_domain_remove(host->intx_domain);
+}
+
+static int rzg3s_pcie_set_max_link_speed(struct rzg3s_pcie_host *host)
+{
+ u32 remote_supported_link_speeds, max_supported_link_speeds;
+ u32 cs2, tmp, pcie_cap = RZG3S_PCI_CFG_PCIEC;
+ u32 cur_link_speed, link_speed;
+ u8 ltssm_state_l0 = 0xc;
+ int ret;
+ u16 ls;
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10, section 34.6.3 Caution
+ * when Changing the Speed Spontaneously) link speed change can be done
+ * only when the LTSSM is in L0.
+ */
+ ret = readl_poll_timeout(host->axi + RZG3S_PCI_PCSTAT1, tmp,
+ FIELD_GET(RZG3S_PCI_PCSTAT1_LTSSM_STATE, tmp) == ltssm_state_l0,
+ PCIE_LINK_WAIT_SLEEP_MS * MILLI,
+ PCIE_LINK_WAIT_SLEEP_MS * MILLI *
+ PCIE_LINK_WAIT_MAX_RETRIES);
+ if (ret)
+ return ret;
+
+ ls = readw_relaxed(host->pcie + pcie_cap + PCI_EXP_LNKSTA);
+ cs2 = readl_relaxed(host->axi + RZG3S_PCI_PCSTAT2);
+
+ switch (pcie_link_speed[host->max_link_speed]) {
+ case PCIE_SPEED_5_0GT:
+ max_supported_link_speeds = GENMASK(PCI_EXP_LNKSTA_CLS_5_0GB - 1, 0);
+ link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT;
+ break;
+ default:
+ /* Should not happen */
+ return -EINVAL;
+ }
+
+ cur_link_speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, ls);
+ remote_supported_link_speeds = FIELD_GET(RZG3S_PCI_PCSTAT2_SDRIRE, cs2);
+ /* Drop reserved bits */
+ remote_supported_link_speeds &= max_supported_link_speeds;
+
+ /*
+ * Return if max link speed is already set or the connected device
+ * doesn't support it.
+ */
+ if (cur_link_speed == host->max_link_speed ||
+ remote_supported_link_speeds != max_supported_link_speeds)
+ return 0;
+
+ /* Set target Link speed */
+ rzg3s_pcie_update_bits(host->pcie, pcie_cap + PCI_EXP_LNKCTL2,
+ PCI_EXP_LNKCTL2_TLS,
+ FIELD_PREP(PCI_EXP_LNKCTL2_TLS, link_speed));
+
+ /* Request link speed change */
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PCCTRL2,
+ RZG3S_PCI_PCCTRL2_LS_CHG_REQ |
+ RZG3S_PCI_PCCTRL2_LS_CHG,
+ RZG3S_PCI_PCCTRL2_LS_CHG_REQ |
+ FIELD_PREP(RZG3S_PCI_PCCTRL2_LS_CHG,
+ link_speed - 1));
+
+ ret = readl_poll_timeout(host->axi + RZG3S_PCI_PCSTAT2, cs2,
+ (cs2 & RZG3S_PCI_PCSTAT2_LS_CHG_DONE),
+ PCIE_LINK_WAIT_SLEEP_MS * MILLI,
+ PCIE_LINK_WAIT_SLEEP_MS * MILLI *
+ PCIE_LINK_WAIT_MAX_RETRIES);
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10, section 34.6.3 Caution
+ * when Changing the Speed Spontaneously) the PCI_PCCTRL2_LS_CHG_REQ
+ * should be de-asserted after checking for PCI_PCSTAT2_LS_CHG_DONE.
+ */
+ rzg3s_pcie_update_bits(host->axi, RZG3S_PCI_PCCTRL2,
+ RZG3S_PCI_PCCTRL2_LS_CHG_REQ, 0);
+
+ return ret;
+}
+
+static int rzg3s_pcie_config_init(struct rzg3s_pcie_host *host)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
+ struct resource_entry *ft;
+ struct resource *bus;
+ u8 subordinate_bus;
+ u8 secondary_bus;
+ u8 primary_bus;
+
+ ft = resource_list_first_type(&bridge->windows, IORESOURCE_BUS);
+ if (!ft)
+ return -ENODEV;
+
+ bus = ft->res;
+ primary_bus = bus->start;
+ secondary_bus = bus->start + 1;
+ subordinate_bus = bus->end;
+
+ /* Enable access control to the CFGU */
+ writel_relaxed(RZG3S_PCI_PERM_CFG_HWINIT_EN,
+ host->axi + RZG3S_PCI_PERM);
+
+ /* HW manual recommends to write 0xffffffff on initialization */
+ writel_relaxed(0xffffffff, host->pcie + RZG3S_PCI_CFG_BARMSK00L);
+ writel_relaxed(0xffffffff, host->pcie + RZG3S_PCI_CFG_BARMSK00U);
+
+ /* Update bus info */
+ writeb_relaxed(primary_bus, host->pcie + PCI_PRIMARY_BUS);
+ writeb_relaxed(secondary_bus, host->pcie + PCI_SECONDARY_BUS);
+ writeb_relaxed(subordinate_bus, host->pcie + PCI_SUBORDINATE_BUS);
+
+ /* Disable access control to the CFGU */
+ writel_relaxed(0, host->axi + RZG3S_PCI_PERM);
+
+ return 0;
+}
+
+static void rzg3s_pcie_irq_init(struct rzg3s_pcie_host *host)
+{
+ /*
+ * According to the HW manual of the RZ/G3S (Rev.1.10, sections
+ * corresponding to all registers written with ~0U), the hardware
+ * ignores value written to unused bits. Writing ~0U to these registers
+ * should be safe.
+ */
+
+ /* Clear the link state and PM transitions */
+ writel_relaxed(RZG3S_PCI_PEIS0_DL_UPDOWN |
+ RZG3S_PCI_PEIS0_RX_DLLP_PM_ENTER,
+ host->axi + RZG3S_PCI_PEIS0);
+
+ /* Disable all interrupts */
+ writel_relaxed(0, host->axi + RZG3S_PCI_PEIE0);
+
+ /* Clear all parity and ecc error interrupts */
+ writel_relaxed(~0U, host->axi + RZG3S_PCI_PEIS1);
+
+ /* Disable all parity and ecc error interrupts */
+ writel_relaxed(0, host->axi + RZG3S_PCI_PEIE1);
+
+ /* Clear all AXI master error interrupts */
+ writel_relaxed(~0U, host->axi + RZG3S_PCI_AMEIS);
+
+ /* Clear all AXI slave error interrupts */
+ writel_relaxed(~0U, host->axi + RZG3S_PCI_ASEIS1);
+
+ /* Clear all message receive interrupts */
+ writel_relaxed(~0U, host->axi + RZG3S_PCI_MSGRCVIS);
+}
+
+static int rzg3s_pcie_power_resets_deassert(struct rzg3s_pcie_host *host)
+{
+ const struct rzg3s_pcie_soc_data *data = host->data;
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10, section
+ * 34.5.1.2 De-asserting the Reset) the PCIe IP needs to wait 5ms from
+ * power on to the de-assertion of reset.
+ */
+ fsleep(5000);
+ return reset_control_bulk_deassert(data->num_power_resets,
+ host->power_resets);
+}
+
+static int rzg3s_pcie_resets_prepare_and_get(struct rzg3s_pcie_host *host)
+{
+ const struct rzg3s_pcie_soc_data *data = host->data;
+ unsigned int i;
+ int ret;
+
+ host->power_resets = devm_kmalloc_array(host->dev,
+ data->num_power_resets,
+ sizeof(*host->power_resets),
+ GFP_KERNEL);
+ if (!host->power_resets)
+ return -ENOMEM;
+
+ for (i = 0; i < data->num_power_resets; i++)
+ host->power_resets[i].id = data->power_resets[i];
+
+ host->cfg_resets = devm_kmalloc_array(host->dev,
+ data->num_cfg_resets,
+ sizeof(*host->cfg_resets),
+ GFP_KERNEL);
+ if (!host->cfg_resets)
+ return -ENOMEM;
+
+ for (i = 0; i < data->num_cfg_resets; i++)
+ host->cfg_resets[i].id = data->cfg_resets[i];
+
+ ret = devm_reset_control_bulk_get_exclusive(host->dev,
+ data->num_power_resets,
+ host->power_resets);
+ if (ret)
+ return ret;
+
+ return devm_reset_control_bulk_get_exclusive(host->dev,
+ data->num_cfg_resets,
+ host->cfg_resets);
+}
+
+static int rzg3s_pcie_host_parse_port(struct rzg3s_pcie_host *host)
+{
+ struct device_node *of_port = of_get_next_child(host->dev->of_node, NULL);
+ struct rzg3s_pcie_port *port = &host->port;
+ int ret;
+
+ ret = of_property_read_u32(of_port, "vendor-id", &port->vendor_id);
+ if (ret)
+ return ret;
+
+ ret = of_property_read_u32(of_port, "device-id", &port->device_id);
+ if (ret)
+ return ret;
+
+ port->refclk = of_clk_get_by_name(of_port, "ref");
+ if (IS_ERR(port->refclk))
+ return PTR_ERR(port->refclk);
+
+ return 0;
+}
+
+static int rzg3s_pcie_host_init_port(struct rzg3s_pcie_host *host)
+{
+ struct rzg3s_pcie_port *port = &host->port;
+ struct device *dev = host->dev;
+ int ret;
+
+ /* Enable access control to the CFGU */
+ writel_relaxed(RZG3S_PCI_PERM_CFG_HWINIT_EN,
+ host->axi + RZG3S_PCI_PERM);
+
+ /* Update vendor ID and device ID */
+ writew_relaxed(port->vendor_id, host->pcie + PCI_VENDOR_ID);
+ writew_relaxed(port->device_id, host->pcie + PCI_DEVICE_ID);
+
+ /* Disable access control to the CFGU */
+ writel_relaxed(0, host->axi + RZG3S_PCI_PERM);
+
+ ret = clk_prepare_enable(port->refclk);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to enable refclk!\n");
+
+ /* Set the PHY, if any */
+ if (host->data->init_phy) {
+ ret = host->data->init_phy(host);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to set the PHY!\n");
+ goto refclk_disable;
+ }
+ }
+
+ return 0;
+
+refclk_disable:
+ clk_disable_unprepare(port->refclk);
+ return ret;
+}
+
+static int rzg3s_pcie_host_init(struct rzg3s_pcie_host *host)
+{
+ u32 val;
+ int ret;
+
+ /* Initialize the PCIe related registers */
+ ret = rzg3s_pcie_config_init(host);
+ if (ret)
+ return ret;
+
+ ret = rzg3s_pcie_host_init_port(host);
+ if (ret)
+ return ret;
+
+ /* Initialize the interrupts */
+ rzg3s_pcie_irq_init(host);
+
+ ret = reset_control_bulk_deassert(host->data->num_cfg_resets,
+ host->cfg_resets);
+ if (ret)
+ goto disable_port_refclk;
+
+ /* Wait for link up */
+ ret = readl_poll_timeout(host->axi + RZG3S_PCI_PCSTAT1, val,
+ !(val & RZG3S_PCI_PCSTAT1_DL_DOWN_STS),
+ PCIE_LINK_WAIT_SLEEP_MS * MILLI,
+ PCIE_LINK_WAIT_SLEEP_MS * MILLI *
+ PCIE_LINK_WAIT_MAX_RETRIES);
+ if (ret)
+ goto cfg_resets_deassert;
+
+ val = readl_relaxed(host->axi + RZG3S_PCI_PCSTAT2);
+ dev_info(host->dev, "PCIe link status [0x%x]\n", val);
+
+ return 0;
+
+cfg_resets_deassert:
+ reset_control_bulk_assert(host->data->num_cfg_resets,
+ host->cfg_resets);
+disable_port_refclk:
+ clk_disable_unprepare(host->port.refclk);
+ return ret;
+}
+
+static void rzg3s_pcie_set_inbound_window(struct rzg3s_pcie_host *host,
+ u64 cpu_addr, u64 pci_addr, u64 size,
+ int id)
+{
+ /* Set CPU window base address */
+ writel_relaxed(upper_32_bits(cpu_addr),
+ host->axi + RZG3S_PCI_ADESTU(id));
+ writel_relaxed(lower_32_bits(cpu_addr),
+ host->axi + RZG3S_PCI_ADESTL(id));
+
+ /* Set window size */
+ writel_relaxed(upper_32_bits(size), host->axi + RZG3S_PCI_AWMASKU(id));
+ writel_relaxed(lower_32_bits(size), host->axi + RZG3S_PCI_AWMASKL(id));
+
+ /* Set PCIe window base address and enable the window */
+ writel_relaxed(upper_32_bits(pci_addr),
+ host->axi + RZG3S_PCI_AWBASEU(id));
+ writel_relaxed(lower_32_bits(pci_addr) | RZG3S_PCI_AWBASEL_WIN_ENA,
+ host->axi + RZG3S_PCI_AWBASEL(id));
+}
+
+static int rzg3s_pcie_set_inbound_windows(struct rzg3s_pcie_host *host,
+ struct resource_entry *entry,
+ int *index)
+{
+ u64 pci_addr = entry->res->start - entry->offset;
+ u64 cpu_addr = entry->res->start;
+ u64 cpu_end = entry->res->end;
+ u64 size_id = 0;
+ int id = *index;
+ u64 size;
+
+ while (cpu_addr < cpu_end) {
+ if (id >= RZG3S_MAX_WINDOWS)
+ return dev_err_probe(host->dev, -ENOSPC,
+ "Failed to map inbound window for resource (%s)\n",
+ entry->res->name);
+
+ size = resource_size(entry->res) - size_id;
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10,
+ * section 34.3.1.71 AXI Window Mask (Lower) Registers) the min
+ * size is 4K.
+ */
+ size = max(size, SZ_4K);
+
+ /*
+ * According the RZ/G3S HW manual (Rev.1.10, sections:
+ * - 34.3.1.69 AXI Window Base (Lower) Registers
+ * - 34.3.1.71 AXI Window Mask (Lower) Registers
+ * - 34.3.1.73 AXI Destination (Lower) Registers)
+ * the CPU addr, PCIe addr, size should be 4K aligned and be a
+ * power of 2.
+ */
+ size = ALIGN(size, SZ_4K);
+ size = roundup_pow_of_two(size);
+
+ cpu_addr = ALIGN(cpu_addr, SZ_4K);
+ pci_addr = ALIGN(pci_addr, SZ_4K);
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10, section
+ * 34.3.1.71 AXI Window Mask (Lower) Registers) HW expects first
+ * 12 LSB bits to be 0xfff. Subtract 1 from size for this.
+ */
+ rzg3s_pcie_set_inbound_window(host, cpu_addr, pci_addr,
+ size - 1, id);
+
+ pci_addr += size;
+ cpu_addr += size;
+ size_id = size;
+ id++;
+ }
+ *index = id;
+
+ return 0;
+}
+
+static int rzg3s_pcie_parse_map_dma_ranges(struct rzg3s_pcie_host *host)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
+ struct resource_entry *entry;
+ int i = 0, ret;
+
+ resource_list_for_each_entry(entry, &bridge->dma_ranges) {
+ ret = rzg3s_pcie_set_inbound_windows(host, entry, &i);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void rzg3s_pcie_set_outbound_window(struct rzg3s_pcie_host *host,
+ struct resource_entry *win, int id)
+{
+ struct resource *res = win->res;
+ resource_size_t size = resource_size(res);
+ resource_size_t res_start;
+
+ if (res->flags & IORESOURCE_IO)
+ res_start = pci_pio_to_address(res->start) - win->offset;
+ else
+ res_start = res->start - win->offset;
+
+ /*
+ * According to the RZ/G3S HW manual (Rev.1.10, section 34.3.1.75 PCIe
+ * Window Base (Lower) Registers) the window base address need to be 4K
+ * aligned.
+ */
+ res_start = ALIGN(res_start, SZ_4K);
+
+ size = ALIGN(size, SZ_4K);
+ size = roundup_pow_of_two(size) - 1;
+
+ /* Set PCIe destination */
+ writel_relaxed(upper_32_bits(res_start),
+ host->axi + RZG3S_PCI_PDESTU(id));
+ writel_relaxed(lower_32_bits(res_start),
+ host->axi + RZG3S_PCI_PDESTL(id));
+
+ /* Set PCIe window mask */
+ writel_relaxed(upper_32_bits(size), host->axi + RZG3S_PCI_PWMASKU(id));
+ writel_relaxed(lower_32_bits(size), host->axi + RZG3S_PCI_PWMASKL(id));
+
+ /* Set PCIe window base and enable the window */
+ writel_relaxed(upper_32_bits(res_start),
+ host->axi + RZG3S_PCI_PWBASEU(id));
+ writel_relaxed(lower_32_bits(res_start) | RZG3S_PCI_PWBASEL_ENA,
+ host->axi + RZG3S_PCI_PWBASEL(id));
+}
+
+static int rzg3s_pcie_parse_map_ranges(struct rzg3s_pcie_host *host)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
+ struct resource_entry *win;
+ int i = 0;
+
+ resource_list_for_each_entry(win, &bridge->windows) {
+ struct resource *res = win->res;
+
+ if (i >= RZG3S_MAX_WINDOWS)
+ return dev_err_probe(host->dev, -ENOSPC,
+ "Failed to map outbound window for resource (%s)\n",
+ res->name);
+
+ if (!res->flags)
+ continue;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_IO:
+ case IORESOURCE_MEM:
+ rzg3s_pcie_set_outbound_window(host, win, i);
+ i++;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int rzg3s_soc_pcie_init_phy(struct rzg3s_pcie_host *host)
+{
+ static const u32 xcfgd_settings[RZG3S_PCI_PHY_XCFGD_NUM] = {
+ [8] = 0xe0006801, 0x007f7e30, 0x183e0000, 0x978ff500,
+ 0xec000000, 0x009f1400, 0x0000d009,
+ [17] = 0x78000000,
+ [19] = 0x00880000, 0x000005c0, 0x07000000, 0x00780920,
+ 0xc9400ce2, 0x90000c0c, 0x000c1414, 0x00005034,
+ 0x00006000, 0x00000001,
+ };
+ static const u32 xcfga_cmn_settings[RZG3S_PCI_PHY_XCFGA_CMN_NUM] = {
+ 0x00000d10, 0x08310100, 0x00c21404, 0x013c0010, 0x01874440,
+ 0x1a216082, 0x00103440, 0x00000080, 0x00000010, 0x0c1000c1,
+ 0x1000c100, 0x0222000c, 0x00640019, 0x00a00028, 0x01d11228,
+ 0x0201001d,
+ };
+ static const u32 xcfga_rx_settings[RZG3S_PCI_PHY_XCFGA_RX_NUM] = {
+ 0x07d55000, 0x030e3f00, 0x00000288, 0x102c5880, 0x0000000b,
+ 0x04141441, 0x00641641, 0x00d63d63, 0x00641641, 0x01970377,
+ 0x00190287, 0x00190028, 0x00000028,
+ };
+ unsigned int i;
+
+ /*
+ * Enable access permission for physical layer control and status
+ * registers.
+ */
+ writel_relaxed(RZG3S_PCI_PERM_PIPE_PHY_REG_EN,
+ host->axi + RZG3S_PCI_PERM);
+
+ for (i = 0; i < RZG3S_PCI_PHY_XCFGD_NUM; i++) {
+ writel_relaxed(xcfgd_settings[i],
+ host->axi + RZG3S_PCI_PHY_XCFGD(i));
+ }
+
+ for (i = 0; i < RZG3S_PCI_PHY_XCFGA_CMN_NUM; i++) {
+ writel_relaxed(xcfga_cmn_settings[i],
+ host->axi + RZG3S_PCI_PHY_XCFGA_CMN(i));
+ }
+
+ for (i = 0; i < RZG3S_PCI_PHY_XCFGA_RX_NUM; i++) {
+ writel_relaxed(xcfga_rx_settings[i],
+ host->axi + RZG3S_PCI_PHY_XCFGA_RX(i));
+ }
+
+ writel_relaxed(0x107, host->axi + RZG3S_PCI_PHY_XCFGA_TX);
+
+ /* Select PHY settings values */
+ writel_relaxed(RZG3S_PCI_PHY_XCFG_CTRL_PHYREG_SEL,
+ host->axi + RZG3S_PCI_PHY_XCFG_CTRL);
+
+ /*
+ * Disable access permission for physical layer control and status
+ * registers.
+ */
+ writel_relaxed(0, host->axi + RZG3S_PCI_PERM);
+
+ return 0;
+}
+
+static int
+rzg3s_pcie_host_setup(struct rzg3s_pcie_host *host,
+ int (*init_irqdomain)(struct rzg3s_pcie_host *host),
+ void (*teardown_irqdomain)(struct rzg3s_pcie_host *host))
+{
+ struct device *dev = host->dev;
+ int ret;
+
+ /* Set inbound windows */
+ ret = rzg3s_pcie_parse_map_dma_ranges(host);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to set inbound windows!\n");
+
+ /* Set outbound windows */
+ ret = rzg3s_pcie_parse_map_ranges(host);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to set outbound windows!\n");
+
+ ret = init_irqdomain(host);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to init IRQ domain\n");
+
+ ret = rzg3s_pcie_host_init(host);
+ if (ret) {
+ dev_err_probe(dev, ret, "Failed to initialize the HW!\n");
+ goto teardown_irqdomain;
+ }
+
+ ret = rzg3s_pcie_set_max_link_speed(host);
+ if (ret)
+ dev_info(dev, "Failed to set max link speed\n");
+
+ msleep(PCIE_RESET_CONFIG_WAIT_MS);
+
+ return 0;
+
+teardown_irqdomain:
+ teardown_irqdomain(host);
+
+ return ret;
+}
+
+static int rzg3s_pcie_probe(struct platform_device *pdev)
+{
+ struct pci_host_bridge *bridge;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct device_node *sysc_np __free(device_node) =
+ of_parse_phandle(np, "renesas,sysc", 0);
+ struct rzg3s_pcie_host *host;
+ int ret;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*host));
+ if (!bridge)
+ return -ENOMEM;
+
+ host = pci_host_bridge_priv(bridge);
+ host->dev = dev;
+ host->data = device_get_match_data(dev);
+ platform_set_drvdata(pdev, host);
+
+ host->axi = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(host->axi))
+ return PTR_ERR(host->axi);
+ host->pcie = host->axi + RZG3S_PCI_CFG_BASE;
+
+ host->max_link_speed = of_pci_get_max_link_speed(np);
+ if (host->max_link_speed < 0)
+ host->max_link_speed = 2;
+
+ ret = rzg3s_pcie_host_parse_port(host);
+ if (ret)
+ return ret;
+
+ host->sysc = syscon_node_to_regmap(sysc_np);
+ if (IS_ERR(host->sysc)) {
+ ret = PTR_ERR(host->sysc);
+ goto port_refclk_put;
+ }
+
+ ret = regmap_update_bits(host->sysc, RZG3S_SYS_PCIE_RST_RSM_B,
+ RZG3S_SYS_PCIE_RST_RSM_B_MASK,
+ FIELD_PREP(RZG3S_SYS_PCIE_RST_RSM_B_MASK, 1));
+ if (ret)
+ goto port_refclk_put;
+
+ ret = rzg3s_pcie_resets_prepare_and_get(host);
+ if (ret)
+ goto sysc_signal_restore;
+
+ ret = rzg3s_pcie_power_resets_deassert(host);
+ if (ret)
+ goto sysc_signal_restore;
+
+ pm_runtime_enable(dev);
+
+ /*
+ * Controller clocks are part of a clock power domain. Enable them
+ * through runtime PM.
+ */
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
+ goto rpm_disable;
+
+ raw_spin_lock_init(&host->hw_lock);
+
+ ret = rzg3s_pcie_host_setup(host, rzg3s_pcie_init_irqdomain,
+ rzg3s_pcie_teardown_irqdomain);
+ if (ret)
+ goto rpm_put;
+
+ bridge->sysdata = host;
+ bridge->ops = &rzg3s_pcie_root_ops;
+ bridge->child_ops = &rzg3s_pcie_child_ops;
+ ret = pci_host_probe(bridge);
+ if (ret)
+ goto host_probe_teardown;
+
+ return 0;
+
+host_probe_teardown:
+ rzg3s_pcie_teardown_irqdomain(host);
+ reset_control_bulk_deassert(host->data->num_cfg_resets,
+ host->cfg_resets);
+rpm_put:
+ pm_runtime_put_sync(dev);
+rpm_disable:
+ pm_runtime_disable(dev);
+ reset_control_bulk_assert(host->data->num_power_resets,
+ host->power_resets);
+sysc_signal_restore:
+ /*
+ * SYSC RST_RSM_B signal need to be asserted before turning off the
+ * power to the PHY.
+ */
+ regmap_update_bits(host->sysc, RZG3S_SYS_PCIE_RST_RSM_B,
+ RZG3S_SYS_PCIE_RST_RSM_B_MASK,
+ FIELD_PREP(RZG3S_SYS_PCIE_RST_RSM_B_MASK, 0));
+port_refclk_put:
+ clk_put(host->port.refclk);
+
+ return ret;
+}
+
+static int rzg3s_pcie_suspend_noirq(struct device *dev)
+{
+ struct rzg3s_pcie_host *host = dev_get_drvdata(dev);
+ const struct rzg3s_pcie_soc_data *data = host->data;
+ struct rzg3s_pcie_port *port = &host->port;
+ struct regmap *sysc = host->sysc;
+ int ret;
+
+ ret = pm_runtime_put_sync(dev);
+ if (ret)
+ return ret;
+
+ clk_disable_unprepare(port->refclk);
+
+ ret = reset_control_bulk_assert(data->num_power_resets,
+ host->power_resets);
+ if (ret)
+ goto refclk_restore;
+
+ ret = reset_control_bulk_assert(data->num_cfg_resets,
+ host->cfg_resets);
+ if (ret)
+ goto power_resets_restore;
+
+ ret = regmap_update_bits(sysc, RZG3S_SYS_PCIE_RST_RSM_B,
+ RZG3S_SYS_PCIE_RST_RSM_B_MASK,
+ FIELD_PREP(RZG3S_SYS_PCIE_RST_RSM_B_MASK, 0));
+ if (ret)
+ goto cfg_resets_restore;
+
+ return 0;
+
+ /* Restore the previous state if any error happens */
+cfg_resets_restore:
+ reset_control_bulk_deassert(data->num_cfg_resets,
+ host->cfg_resets);
+power_resets_restore:
+ reset_control_bulk_deassert(data->num_power_resets,
+ host->power_resets);
+refclk_restore:
+ clk_prepare_enable(port->refclk);
+ pm_runtime_resume_and_get(dev);
+ return ret;
+}
+
+static int rzg3s_pcie_resume_noirq(struct device *dev)
+{
+ struct rzg3s_pcie_host *host = dev_get_drvdata(dev);
+ const struct rzg3s_pcie_soc_data *data = host->data;
+ struct regmap *sysc = host->sysc;
+ int ret;
+
+ ret = regmap_update_bits(sysc, RZG3S_SYS_PCIE_RST_RSM_B,
+ RZG3S_SYS_PCIE_RST_RSM_B_MASK,
+ FIELD_PREP(RZG3S_SYS_PCIE_RST_RSM_B_MASK, 1));
+ if (ret)
+ return ret;
+
+ ret = rzg3s_pcie_power_resets_deassert(host);
+ if (ret)
+ goto assert_rst_rsm_b;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
+ goto assert_power_resets;
+
+ ret = rzg3s_pcie_host_setup(host, rzg3s_pcie_msi_hw_setup,
+ rzg3s_pcie_msi_hw_teardown);
+ if (ret)
+ goto rpm_put;
+
+ return 0;
+
+ /*
+ * If any error happens there is no way to recover the IP. Put it in the
+ * lowest possible power state.
+ */
+rpm_put:
+ pm_runtime_put_sync(dev);
+assert_power_resets:
+ reset_control_bulk_assert(data->num_power_resets,
+ host->power_resets);
+assert_rst_rsm_b:
+ regmap_update_bits(sysc, RZG3S_SYS_PCIE_RST_RSM_B,
+ RZG3S_SYS_PCIE_RST_RSM_B_MASK,
+ FIELD_PREP(RZG3S_SYS_PCIE_RST_RSM_B_MASK, 0));
+ return ret;
+}
+
+static const struct dev_pm_ops rzg3s_pcie_pm_ops = {
+ NOIRQ_SYSTEM_SLEEP_PM_OPS(rzg3s_pcie_suspend_noirq,
+ rzg3s_pcie_resume_noirq)
+};
+
+static const char * const rzg3s_soc_power_resets[] = {
+ "aresetn", "rst_cfg_b", "rst_load_b",
+};
+
+static const char * const rzg3s_soc_cfg_resets[] = {
+ "rst_b", "rst_ps_b", "rst_gp_b", "rst_rsm_b",
+};
+
+static const struct rzg3s_pcie_soc_data rzg3s_soc_data = {
+ .power_resets = rzg3s_soc_power_resets,
+ .num_power_resets = ARRAY_SIZE(rzg3s_soc_power_resets),
+ .cfg_resets = rzg3s_soc_cfg_resets,
+ .num_cfg_resets = ARRAY_SIZE(rzg3s_soc_cfg_resets),
+ .init_phy = rzg3s_soc_pcie_init_phy,
+};
+
+static const struct of_device_id rzg3s_pcie_of_match[] = {
+ {
+ .compatible = "renesas,r9a08g045-pcie",
+ .data = &rzg3s_soc_data,
+ },
+ {}
+};
+
+static struct platform_driver rzg3s_pcie_driver = {
+ .driver = {
+ .name = "rzg3s-pcie-host",
+ .of_match_table = rzg3s_pcie_of_match,
+ .pm = pm_ptr(&rzg3s_pcie_pm_ops),
+ .suppress_bind_attrs = true,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+ .probe = rzg3s_pcie_probe,
+};
+builtin_platform_driver(rzg3s_pcie_driver);
gentwo / linux / .git / commitdiff