bool "Renesas R-Car PCIe controller"
depends on ARCH_RENESAS || COMPILE_TEST
depends on PCI_MSI_IRQ_DOMAIN
+ select PCIE_RCAR_HOST
help
Say Y here if you want PCIe controller support on R-Car SoCs.
+ This option will be removed after arm64 defconfig is updated.
+
+config PCIE_RCAR_HOST
+ bool "Renesas R-Car PCIe host controller"
+ depends on ARCH_RENESAS || COMPILE_TEST
+ depends on PCI_MSI_IRQ_DOMAIN
+ help
+ Say Y here if you want PCIe controller support on R-Car SoCs in host
+ mode.
config PCI_HOST_COMMON
bool
obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o
obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
-obj-$(CONFIG_PCIE_RCAR) += pcie-rcar.o
+obj-$(CONFIG_PCIE_RCAR_HOST) += pcie-rcar-host.o
obj-$(CONFIG_PCI_HOST_COMMON) += pci-host-common.o
obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe driver for Renesas R-Car SoCs
+ * Copyright (C) 2014 Renesas Electronics Europe Ltd
+ *
+ * Based on:
+ * arch/sh/drivers/pci/pcie-sh7786.c
+ * arch/sh/drivers/pci/ops-sh7786.c
+ * Copyright (C) 2009 - 2011 Paul Mundt
+ *
+ * Author: Phil Edworthy <phil.edworthy@renesas.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#define PCIECAR 0x000010
+#define PCIECCTLR 0x000018
+#define CONFIG_SEND_ENABLE BIT(31)
+#define TYPE0 (0 << 8)
+#define TYPE1 BIT(8)
+#define PCIECDR 0x000020
+#define PCIEMSR 0x000028
+#define PCIEINTXR 0x000400
+#define PCIEPHYSR 0x0007f0
+#define PHYRDY BIT(0)
+#define PCIEMSITXR 0x000840
+
+/* Transfer control */
+#define PCIETCTLR 0x02000
+#define DL_DOWN BIT(3)
+#define CFINIT BIT(0)
+#define PCIETSTR 0x02004
+#define DATA_LINK_ACTIVE BIT(0)
+#define PCIEERRFR 0x02020
+#define UNSUPPORTED_REQUEST BIT(4)
+#define PCIEMSIFR 0x02044
+#define PCIEMSIALR 0x02048
+#define MSIFE BIT(0)
+#define PCIEMSIAUR 0x0204c
+#define PCIEMSIIER 0x02050
+
+/* root port address */
+#define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
+
+/* local address reg & mask */
+#define PCIELAR(x) (0x02200 + ((x) * 0x20))
+#define PCIELAMR(x) (0x02208 + ((x) * 0x20))
+#define LAM_PREFETCH BIT(3)
+#define LAM_64BIT BIT(2)
+#define LAR_ENABLE BIT(1)
+
+/* PCIe address reg & mask */
+#define PCIEPALR(x) (0x03400 + ((x) * 0x20))
+#define PCIEPAUR(x) (0x03404 + ((x) * 0x20))
+#define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
+#define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
+#define PAR_ENABLE BIT(31)
+#define IO_SPACE BIT(8)
+
+/* Configuration */
+#define PCICONF(x) (0x010000 + ((x) * 0x4))
+#define PMCAP(x) (0x010040 + ((x) * 0x4))
+#define EXPCAP(x) (0x010070 + ((x) * 0x4))
+#define VCCAP(x) (0x010100 + ((x) * 0x4))
+
+/* link layer */
+#define IDSETR1 0x011004
+#define TLCTLR 0x011048
+#define MACSR 0x011054
+#define SPCHGFIN BIT(4)
+#define SPCHGFAIL BIT(6)
+#define SPCHGSUC BIT(7)
+#define LINK_SPEED (0xf << 16)
+#define LINK_SPEED_2_5GTS (1 << 16)
+#define LINK_SPEED_5_0GTS (2 << 16)
+#define MACCTLR 0x011058
+#define MACCTLR_NFTS_MASK GENMASK(23, 16) /* The name is from SH7786 */
+#define SPEED_CHANGE BIT(24)
+#define SCRAMBLE_DISABLE BIT(27)
+#define LTSMDIS BIT(31)
+#define MACCTLR_INIT_VAL (LTSMDIS | MACCTLR_NFTS_MASK)
+#define PMSR 0x01105c
+#define MACS2R 0x011078
+#define MACCGSPSETR 0x011084
+#define SPCNGRSN BIT(31)
+
+/* R-Car H1 PHY */
+#define H1_PCIEPHYADRR 0x04000c
+#define WRITE_CMD BIT(16)
+#define PHY_ACK BIT(24)
+#define RATE_POS 12
+#define LANE_POS 8
+#define ADR_POS 0
+#define H1_PCIEPHYDOUTR 0x040014
+
+/* R-Car Gen2 PHY */
+#define GEN2_PCIEPHYADDR 0x780
+#define GEN2_PCIEPHYDATA 0x784
+#define GEN2_PCIEPHYCTRL 0x78c
+
+#define INT_PCI_MSI_NR 32
+
+#define RCONF(x) (PCICONF(0) + (x))
+#define RPMCAP(x) (PMCAP(0) + (x))
+#define REXPCAP(x) (EXPCAP(0) + (x))
+#define RVCCAP(x) (VCCAP(0) + (x))
+
+#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
+#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
+#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
+
+#define RCAR_PCI_MAX_RESOURCES 4
+#define MAX_NR_INBOUND_MAPS 6
+
+struct rcar_msi {
+ DECLARE_BITMAP(used, INT_PCI_MSI_NR);
+ struct irq_domain *domain;
+ struct msi_controller chip;
+ unsigned long pages;
+ struct mutex lock;
+ int irq1;
+ int irq2;
+};
+
+static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip)
+{
+ return container_of(chip, struct rcar_msi, chip);
+}
+
+/* Structure representing the PCIe interface */
+struct rcar_pcie {
+ struct device *dev;
+ struct phy *phy;
+ void __iomem *base;
+ struct list_head resources;
+ int root_bus_nr;
+ struct clk *bus_clk;
+ struct rcar_msi msi;
+ int (*phy_init_fn)(struct rcar_pcie *pcie);
+};
+
+static void rcar_pci_write_reg(struct rcar_pcie *pcie, u32 val,
+ unsigned int reg)
+{
+ writel(val, pcie->base + reg);
+}
+
+static u32 rcar_pci_read_reg(struct rcar_pcie *pcie, unsigned int reg)
+{
+ return readl(pcie->base + reg);
+}
+
+enum {
+ RCAR_PCI_ACCESS_READ,
+ RCAR_PCI_ACCESS_WRITE,
+};
+
+static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
+{
+ unsigned int shift = BITS_PER_BYTE * (where & 3);
+ u32 val = rcar_pci_read_reg(pcie, where & ~3);
+
+ val &= ~(mask << shift);
+ val |= data << shift;
+ rcar_pci_write_reg(pcie, val, where & ~3);
+}
+
+static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
+{
+ unsigned int shift = BITS_PER_BYTE * (where & 3);
+ u32 val = rcar_pci_read_reg(pcie, where & ~3);
+
+ return val >> shift;
+}
+
+/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
+static int rcar_pcie_config_access(struct rcar_pcie *pcie,
+ unsigned char access_type, struct pci_bus *bus,
+ unsigned int devfn, int where, u32 *data)
+{
+ unsigned int dev, func, reg, index;
+
+ dev = PCI_SLOT(devfn);
+ func = PCI_FUNC(devfn);
+ reg = where & ~3;
+ index = reg / 4;
+
+ /*
+ * While each channel has its own memory-mapped extended config
+ * space, it's generally only accessible when in endpoint mode.
+ * When in root complex mode, the controller is unable to target
+ * itself with either type 0 or type 1 accesses, and indeed, any
+ * controller initiated target transfer to its own config space
+ * result in a completer abort.
+ *
+ * Each channel effectively only supports a single device, but as
+ * the same channel <-> device access works for any PCI_SLOT()
+ * value, we cheat a bit here and bind the controller's config
+ * space to devfn 0 in order to enable self-enumeration. In this
+ * case the regular ECAR/ECDR path is sidelined and the mangled
+ * config access itself is initiated as an internal bus transaction.
+ */
+ if (pci_is_root_bus(bus)) {
+ if (dev != 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ if (access_type == RCAR_PCI_ACCESS_READ) {
+ *data = rcar_pci_read_reg(pcie, PCICONF(index));
+ } else {
+ /* Keep an eye out for changes to the root bus number */
+ if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS))
+ pcie->root_bus_nr = *data & 0xff;
+
+ rcar_pci_write_reg(pcie, *data, PCICONF(index));
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ if (pcie->root_bus_nr < 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ /* Clear errors */
+ rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
+
+ /* Set the PIO address */
+ rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) |
+ PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR);
+
+ /* Enable the configuration access */
+ if (bus->parent->number == pcie->root_bus_nr)
+ rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
+ else
+ rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);
+
+ /* Check for errors */
+ if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ /* Check for master and target aborts */
+ if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
+ (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ if (access_type == RCAR_PCI_ACCESS_READ)
+ *data = rcar_pci_read_reg(pcie, PCIECDR);
+ else
+ rcar_pci_write_reg(pcie, *data, PCIECDR);
+
+ /* Disable the configuration access */
+ rcar_pci_write_reg(pcie, 0, PCIECCTLR);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ struct rcar_pcie *pcie = bus->sysdata;
+ int ret;
+
+ ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
+ bus, devfn, where, val);
+ if (ret != PCIBIOS_SUCCESSFUL) {
+ *val = 0xffffffff;
+ return ret;
+ }
+
+ if (size == 1)
+ *val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;
+ else if (size == 2)
+ *val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff;
+
+ dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
+ bus->number, devfn, where, size, *val);
+
+ return ret;
+}
+
+/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
+static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ struct rcar_pcie *pcie = bus->sysdata;
+ unsigned int shift;
+ u32 data;
+ int ret;
+
+ ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
+ bus, devfn, where, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
+ bus->number, devfn, where, size, val);
+
+ 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;
+
+ ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_WRITE,
+ bus, devfn, where, &data);
+
+ return ret;
+}
+
+static struct pci_ops rcar_pcie_ops = {
+ .read = rcar_pcie_read_conf,
+ .write = rcar_pcie_write_conf,
+};
+
+static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie,
+ struct resource_entry *window)
+{
+ /* Setup PCIe address space mappings for each resource */
+ resource_size_t size;
+ resource_size_t res_start;
+ struct resource *res = window->res;
+ u32 mask;
+
+ rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));
+
+ /*
+ * The PAMR mask is calculated in units of 128Bytes, which
+ * keeps things pretty simple.
+ */
+ size = resource_size(res);
+ mask = (roundup_pow_of_two(size) / SZ_128) - 1;
+ rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
+
+ if (res->flags & IORESOURCE_IO)
+ res_start = pci_pio_to_address(res->start) - window->offset;
+ else
+ res_start = res->start - window->offset;
+
+ rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win));
+ rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F,
+ PCIEPALR(win));
+
+ /* First resource is for IO */
+ mask = PAR_ENABLE;
+ if (res->flags & IORESOURCE_IO)
+ mask |= IO_SPACE;
+
+ rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
+}
+
+static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pci)
+{
+ struct resource_entry *win;
+ int i = 0;
+
+ /* Setup PCI resources */
+ resource_list_for_each_entry(win, &pci->resources) {
+ struct resource *res = win->res;
+
+ if (!res->flags)
+ continue;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_IO:
+ case IORESOURCE_MEM:
+ rcar_pcie_setup_window(i, pci, win);
+ i++;
+ break;
+ case IORESOURCE_BUS:
+ pci->root_bus_nr = res->start;
+ break;
+ default:
+ continue;
+ }
+
+ pci_add_resource(resource, res);
+ }
+
+ return 1;
+}
+
+static void rcar_pcie_force_speedup(struct rcar_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ unsigned int timeout = 1000;
+ u32 macsr;
+
+ if ((rcar_pci_read_reg(pcie, MACS2R) & LINK_SPEED) != LINK_SPEED_5_0GTS)
+ return;
+
+ if (rcar_pci_read_reg(pcie, MACCTLR) & SPEED_CHANGE) {
+ dev_err(dev, "Speed change already in progress\n");
+ return;
+ }
+
+ macsr = rcar_pci_read_reg(pcie, MACSR);
+ if ((macsr & LINK_SPEED) == LINK_SPEED_5_0GTS)
+ goto done;
+
+ /* Set target link speed to 5.0 GT/s */
+ rcar_rmw32(pcie, EXPCAP(12), PCI_EXP_LNKSTA_CLS,
+ PCI_EXP_LNKSTA_CLS_5_0GB);
+
+ /* Set speed change reason as intentional factor */
+ rcar_rmw32(pcie, MACCGSPSETR, SPCNGRSN, 0);
+
+ /* Clear SPCHGFIN, SPCHGSUC, and SPCHGFAIL */
+ if (macsr & (SPCHGFIN | SPCHGSUC | SPCHGFAIL))
+ rcar_pci_write_reg(pcie, macsr, MACSR);
+
+ /* Start link speed change */
+ rcar_rmw32(pcie, MACCTLR, SPEED_CHANGE, SPEED_CHANGE);
+
+ while (timeout--) {
+ macsr = rcar_pci_read_reg(pcie, MACSR);
+ if (macsr & SPCHGFIN) {
+ /* Clear the interrupt bits */
+ rcar_pci_write_reg(pcie, macsr, MACSR);
+
+ if (macsr & SPCHGFAIL)
+ dev_err(dev, "Speed change failed\n");
+
+ goto done;
+ }
+
+ msleep(1);
+ }
+
+ dev_err(dev, "Speed change timed out\n");
+
+done:
+ dev_info(dev, "Current link speed is %s GT/s\n",
+ (macsr & LINK_SPEED) == LINK_SPEED_5_0GTS ? "5" : "2.5");
+}
+
+static void rcar_pcie_hw_enable(struct rcar_pcie *pci)
+{
+ struct resource_entry *win;
+ LIST_HEAD(res);
+ int i = 0;
+
+ /* Try setting 5 GT/s link speed */
+ rcar_pcie_force_speedup(pci);
+
+ /* Setup PCI resources */
+ resource_list_for_each_entry(win, &pci->resources) {
+ struct resource *res = win->res;
+
+ if (!res->flags)
+ continue;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_IO:
+ case IORESOURCE_MEM:
+ rcar_pcie_setup_window(i, pci, win);
+ i++;
+ break;
+ }
+ }
+}
+
+static int rcar_pcie_enable(struct rcar_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
+ struct pci_bus *bus, *child;
+ int ret;
+
+ /* Try setting 5 GT/s link speed */
+ rcar_pcie_force_speedup(pcie);
+
+ rcar_pcie_setup(&bridge->windows, pcie);
+
+ pci_add_flags(PCI_REASSIGN_ALL_BUS);
+
+ bridge->dev.parent = dev;
+ bridge->sysdata = pcie;
+ bridge->busnr = pcie->root_bus_nr;
+ bridge->ops = &rcar_pcie_ops;
+ bridge->map_irq = of_irq_parse_and_map_pci;
+ bridge->swizzle_irq = pci_common_swizzle;
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ bridge->msi = &pcie->msi.chip;
+
+ ret = pci_scan_root_bus_bridge(bridge);
+ if (ret < 0)
+ return ret;
+
+ bus = bridge->bus;
+
+ pci_bus_size_bridges(bus);
+ pci_bus_assign_resources(bus);
+
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+
+ pci_bus_add_devices(bus);
+
+ return 0;
+}
+
+static int phy_wait_for_ack(struct rcar_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ unsigned int timeout = 100;
+
+ while (timeout--) {
+ if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
+ return 0;
+
+ udelay(100);
+ }
+
+ dev_err(dev, "Access to PCIe phy timed out\n");
+
+ return -ETIMEDOUT;
+}
+
+static void phy_write_reg(struct rcar_pcie *pcie,
+ unsigned int rate, u32 addr,
+ unsigned int lane, u32 data)
+{
+ u32 phyaddr;
+
+ phyaddr = WRITE_CMD |
+ ((rate & 1) << RATE_POS) |
+ ((lane & 0xf) << LANE_POS) |
+ ((addr & 0xff) << ADR_POS);
+
+ /* Set write data */
+ rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
+ rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
+
+ /* Ignore errors as they will be dealt with if the data link is down */
+ phy_wait_for_ack(pcie);
+
+ /* Clear command */
+ rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
+ rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
+
+ /* Ignore errors as they will be dealt with if the data link is down */
+ phy_wait_for_ack(pcie);
+}
+
+static int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie)
+{
+ unsigned int timeout = 10;
+
+ while (timeout--) {
+ if (rcar_pci_read_reg(pcie, PCIEPHYSR) & PHYRDY)
+ return 0;
+
+ msleep(5);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
+{
+ unsigned int timeout = 10000;
+
+ while (timeout--) {
+ if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
+ return 0;
+
+ udelay(5);
+ cpu_relax();
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
+{
+ int err;
+
+ /* Begin initialization */
+ rcar_pci_write_reg(pcie, 0, PCIETCTLR);
+
+ /* Set mode */
+ rcar_pci_write_reg(pcie, 1, PCIEMSR);
+
+ err = rcar_pcie_wait_for_phyrdy(pcie);
+ if (err)
+ return err;
+
+ /*
+ * Initial header for port config space is type 1, set the device
+ * class to match. Hardware takes care of propagating the IDSETR
+ * settings, so there is no need to bother with a quirk.
+ */
+ rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1);
+
+ /*
+ * Setup Secondary Bus Number & Subordinate Bus Number, even though
+ * they aren't used, to avoid bridge being detected as broken.
+ */
+ rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
+ rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
+
+ /* Initialize default capabilities. */
+ rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
+ rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
+ PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
+ rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f,
+ PCI_HEADER_TYPE_BRIDGE);
+
+ /* Enable data link layer active state reporting */
+ rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC,
+ PCI_EXP_LNKCAP_DLLLARC);
+
+ /* Write out the physical slot number = 0 */
+ rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);
+
+ /* Set the completion timer timeout to the maximum 50ms. */
+ rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50);
+
+ /* Terminate list of capabilities (Next Capability Offset=0) */
+ rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0);
+
+ /* Enable MSI */
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR);
+
+ rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
+
+ /* Finish initialization - establish a PCI Express link */
+ rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
+
+ /* This will timeout if we don't have a link. */
+ err = rcar_pcie_wait_for_dl(pcie);
+ if (err)
+ return err;
+
+ /* Enable INTx interrupts */
+ rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);
+
+ wmb();
+
+ return 0;
+}
+
+static int rcar_pcie_phy_init_h1(struct rcar_pcie *pcie)
+{
+ /* Initialize the phy */
+ phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
+ phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
+ phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
+ phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
+ phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
+ phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
+ phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
+ phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
+ phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
+ phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
+ phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
+ phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);
+
+ phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
+ phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
+ phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);
+
+ return 0;
+}
+
+static int rcar_pcie_phy_init_gen2(struct rcar_pcie *pcie)
+{
+ /*
+ * These settings come from the R-Car Series, 2nd Generation User's
+ * Manual, section 50.3.1 (2) Initialization of the physical layer.
+ */
+ rcar_pci_write_reg(pcie, 0x000f0030, GEN2_PCIEPHYADDR);
+ rcar_pci_write_reg(pcie, 0x00381203, GEN2_PCIEPHYDATA);
+ rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
+ rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
+
+ rcar_pci_write_reg(pcie, 0x000f0054, GEN2_PCIEPHYADDR);
+ /* The following value is for DC connection, no termination resistor */
+ rcar_pci_write_reg(pcie, 0x13802007, GEN2_PCIEPHYDATA);
+ rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
+ rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
+
+ return 0;
+}
+
+static int rcar_pcie_phy_init_gen3(struct rcar_pcie *pcie)
+{
+ int err;
+
+ err = phy_init(pcie->phy);
+ if (err)
+ return err;
+
+ err = phy_power_on(pcie->phy);
+ if (err)
+ phy_exit(pcie->phy);
+
+ return err;
+}
+
+static int rcar_msi_alloc(struct rcar_msi *chip)
+{
+ int msi;
+
+ mutex_lock(&chip->lock);
+
+ msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
+ if (msi < INT_PCI_MSI_NR)
+ set_bit(msi, chip->used);
+ else
+ msi = -ENOSPC;
+
+ mutex_unlock(&chip->lock);
+
+ return msi;
+}
+
+static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs)
+{
+ int msi;
+
+ mutex_lock(&chip->lock);
+ msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR,
+ order_base_2(no_irqs));
+ mutex_unlock(&chip->lock);
+
+ return msi;
+}
+
+static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
+{
+ mutex_lock(&chip->lock);
+ clear_bit(irq, chip->used);
+ mutex_unlock(&chip->lock);
+}
+
+static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
+{
+ struct rcar_pcie *pcie = data;
+ struct rcar_msi *msi = &pcie->msi;
+ struct device *dev = pcie->dev;
+ unsigned long reg;
+
+ reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
+
+ /* MSI & INTx share an interrupt - we only handle MSI here */
+ if (!reg)
+ return IRQ_NONE;
+
+ while (reg) {
+ unsigned int index = find_first_bit(®, 32);
+ unsigned int msi_irq;
+
+ /* clear the interrupt */
+ rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);
+
+ msi_irq = irq_find_mapping(msi->domain, index);
+ if (msi_irq) {
+ if (test_bit(index, msi->used))
+ generic_handle_irq(msi_irq);
+ else
+ dev_info(dev, "unhandled MSI\n");
+ } else {
+ /* Unknown MSI, just clear it */
+ dev_dbg(dev, "unexpected MSI\n");
+ }
+
+ /* see if there's any more pending in this vector */
+ reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
+ struct msi_desc *desc)
+{
+ struct rcar_msi *msi = to_rcar_msi(chip);
+ struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
+ struct msi_msg msg;
+ unsigned int irq;
+ int hwirq;
+
+ hwirq = rcar_msi_alloc(msi);
+ if (hwirq < 0)
+ return hwirq;
+
+ irq = irq_find_mapping(msi->domain, hwirq);
+ if (!irq) {
+ rcar_msi_free(msi, hwirq);
+ return -EINVAL;
+ }
+
+ irq_set_msi_desc(irq, desc);
+
+ msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
+ msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
+ msg.data = hwirq;
+
+ pci_write_msi_msg(irq, &msg);
+
+ return 0;
+}
+
+static int rcar_msi_setup_irqs(struct msi_controller *chip,
+ struct pci_dev *pdev, int nvec, int type)
+{
+ struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
+ struct rcar_msi *msi = to_rcar_msi(chip);
+ struct msi_desc *desc;
+ struct msi_msg msg;
+ unsigned int irq;
+ int hwirq;
+ int i;
+
+ /* MSI-X interrupts are not supported */
+ if (type == PCI_CAP_ID_MSIX)
+ return -EINVAL;
+
+ WARN_ON(!list_is_singular(&pdev->dev.msi_list));
+ desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
+
+ hwirq = rcar_msi_alloc_region(msi, nvec);
+ if (hwirq < 0)
+ return -ENOSPC;
+
+ irq = irq_find_mapping(msi->domain, hwirq);
+ if (!irq)
+ return -ENOSPC;
+
+ for (i = 0; i < nvec; i++) {
+ /*
+ * irq_create_mapping() called from rcar_pcie_probe() pre-
+ * allocates descs, so there is no need to allocate descs here.
+ * We can therefore assume that if irq_find_mapping() above
+ * returns non-zero, then the descs are also successfully
+ * allocated.
+ */
+ if (irq_set_msi_desc_off(irq, i, desc)) {
+ /* TODO: clear */
+ return -EINVAL;
+ }
+ }
+
+ desc->nvec_used = nvec;
+ desc->msi_attrib.multiple = order_base_2(nvec);
+
+ msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
+ msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
+ msg.data = hwirq;
+
+ pci_write_msi_msg(irq, &msg);
+
+ return 0;
+}
+
+static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
+{
+ struct rcar_msi *msi = to_rcar_msi(chip);
+ struct irq_data *d = irq_get_irq_data(irq);
+
+ rcar_msi_free(msi, d->hwirq);
+}
+
+static struct irq_chip rcar_msi_irq_chip = {
+ .name = "R-Car PCIe MSI",
+ .irq_enable = pci_msi_unmask_irq,
+ .irq_disable = pci_msi_mask_irq,
+ .irq_mask = pci_msi_mask_irq,
+ .irq_unmask = pci_msi_unmask_irq,
+};
+
+static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
+ irq_set_chip_data(irq, domain->host_data);
+
+ return 0;
+}
+
+static const struct irq_domain_ops msi_domain_ops = {
+ .map = rcar_msi_map,
+};
+
+static void rcar_pcie_unmap_msi(struct rcar_pcie *pcie)
+{
+ struct rcar_msi *msi = &pcie->msi;
+ int i, irq;
+
+ for (i = 0; i < INT_PCI_MSI_NR; i++) {
+ irq = irq_find_mapping(msi->domain, i);
+ if (irq > 0)
+ irq_dispose_mapping(irq);
+ }
+
+ irq_domain_remove(msi->domain);
+}
+
+static void rcar_pcie_hw_enable_msi(struct rcar_pcie *pcie)
+{
+ struct rcar_msi *msi = &pcie->msi;
+ unsigned long base;
+
+ /* setup MSI data target */
+ base = virt_to_phys((void *)msi->pages);
+
+ rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR);
+ rcar_pci_write_reg(pcie, upper_32_bits(base), PCIEMSIAUR);
+
+ /* enable all MSI interrupts */
+ rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
+}
+
+static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct rcar_msi *msi = &pcie->msi;
+ int err, i;
+
+ mutex_init(&msi->lock);
+
+ msi->chip.dev = dev;
+ msi->chip.setup_irq = rcar_msi_setup_irq;
+ msi->chip.setup_irqs = rcar_msi_setup_irqs;
+ msi->chip.teardown_irq = rcar_msi_teardown_irq;
+
+ msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
+ &msi_domain_ops, &msi->chip);
+ if (!msi->domain) {
+ dev_err(dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < INT_PCI_MSI_NR; i++)
+ irq_create_mapping(msi->domain, i);
+
+ /* Two irqs are for MSI, but they are also used for non-MSI irqs */
+ err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq,
+ IRQF_SHARED | IRQF_NO_THREAD,
+ rcar_msi_irq_chip.name, pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to request IRQ: %d\n", err);
+ goto err;
+ }
+
+ err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq,
+ IRQF_SHARED | IRQF_NO_THREAD,
+ rcar_msi_irq_chip.name, pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to request IRQ: %d\n", err);
+ goto err;
+ }
+
+ /* setup MSI data target */
+ msi->pages = __get_free_pages(GFP_KERNEL, 0);
+ rcar_pcie_hw_enable_msi(pcie);
+
+ return 0;
+
+err:
+ rcar_pcie_unmap_msi(pcie);
+ return err;
+}
+
+static void rcar_pcie_teardown_msi(struct rcar_pcie *pcie)
+{
+ struct rcar_msi *msi = &pcie->msi;
+
+ /* Disable all MSI interrupts */
+ rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
+
+ /* Disable address decoding of the MSI interrupt, MSIFE */
+ rcar_pci_write_reg(pcie, 0, PCIEMSIALR);
+
+ free_pages(msi->pages, 0);
+
+ rcar_pcie_unmap_msi(pcie);
+}
+
+static int rcar_pcie_get_resources(struct rcar_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct resource res;
+ int err, i;
+
+ pcie->phy = devm_phy_optional_get(dev, "pcie");
+ if (IS_ERR(pcie->phy))
+ return PTR_ERR(pcie->phy);
+
+ err = of_address_to_resource(dev->of_node, 0, &res);
+ if (err)
+ return err;
+
+ pcie->base = devm_ioremap_resource(dev, &res);
+ if (IS_ERR(pcie->base))
+ return PTR_ERR(pcie->base);
+
+ pcie->bus_clk = devm_clk_get(dev, "pcie_bus");
+ if (IS_ERR(pcie->bus_clk)) {
+ dev_err(dev, "cannot get pcie bus clock\n");
+ return PTR_ERR(pcie->bus_clk);
+ }
+
+ i = irq_of_parse_and_map(dev->of_node, 0);
+ if (!i) {
+ dev_err(dev, "cannot get platform resources for msi interrupt\n");
+ err = -ENOENT;
+ goto err_irq1;
+ }
+ pcie->msi.irq1 = i;
+
+ i = irq_of_parse_and_map(dev->of_node, 1);
+ if (!i) {
+ dev_err(dev, "cannot get platform resources for msi interrupt\n");
+ err = -ENOENT;
+ goto err_irq2;
+ }
+ pcie->msi.irq2 = i;
+
+ return 0;
+
+err_irq2:
+ irq_dispose_mapping(pcie->msi.irq1);
+err_irq1:
+ return err;
+}
+
+static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
+ struct resource_entry *entry,
+ int *index)
+{
+ u64 restype = entry->res->flags;
+ u64 cpu_addr = entry->res->start;
+ u64 cpu_end = entry->res->end;
+ u64 pci_addr = entry->res->start - entry->offset;
+ u32 flags = LAM_64BIT | LAR_ENABLE;
+ u64 mask;
+ u64 size = resource_size(entry->res);
+ int idx = *index;
+
+ if (restype & IORESOURCE_PREFETCH)
+ flags |= LAM_PREFETCH;
+
+ while (cpu_addr < cpu_end) {
+ if (idx >= MAX_NR_INBOUND_MAPS - 1) {
+ dev_err(pcie->dev, "Failed to map inbound regions!\n");
+ return -EINVAL;
+ }
+ /*
+ * If the size of the range is larger than the alignment of
+ * the start address, we have to use multiple entries to
+ * perform the mapping.
+ */
+ if (cpu_addr > 0) {
+ unsigned long nr_zeros = __ffs64(cpu_addr);
+ u64 alignment = 1ULL << nr_zeros;
+
+ size = min(size, alignment);
+ }
+ /* Hardware supports max 4GiB inbound region */
+ size = min(size, 1ULL << 32);
+
+ mask = roundup_pow_of_two(size) - 1;
+ mask &= ~0xf;
+
+ /*
+ * Set up 64-bit inbound regions as the range parser doesn't
+ * distinguish between 32 and 64-bit types.
+ */
+ rcar_pci_write_reg(pcie, lower_32_bits(pci_addr),
+ PCIEPRAR(idx));
+ rcar_pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
+ rcar_pci_write_reg(pcie, lower_32_bits(mask) | flags,
+ PCIELAMR(idx));
+
+ rcar_pci_write_reg(pcie, upper_32_bits(pci_addr),
+ PCIEPRAR(idx + 1));
+ rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr),
+ PCIELAR(idx + 1));
+ rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1));
+
+ pci_addr += size;
+ cpu_addr += size;
+ idx += 2;
+ }
+ *index = idx;
+
+ return 0;
+}
+
+static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
+ struct resource_entry *entry;
+ int index = 0, err = 0;
+
+ resource_list_for_each_entry(entry, &bridge->dma_ranges) {
+ err = rcar_pcie_inbound_ranges(pcie, entry, &index);
+ if (err)
+ break;
+ }
+
+ return err;
+}
+
+static const struct of_device_id rcar_pcie_of_match[] = {
+ { .compatible = "renesas,pcie-r8a7779",
+ .data = rcar_pcie_phy_init_h1 },
+ { .compatible = "renesas,pcie-r8a7790",
+ .data = rcar_pcie_phy_init_gen2 },
+ { .compatible = "renesas,pcie-r8a7791",
+ .data = rcar_pcie_phy_init_gen2 },
+ { .compatible = "renesas,pcie-rcar-gen2",
+ .data = rcar_pcie_phy_init_gen2 },
+ { .compatible = "renesas,pcie-r8a7795",
+ .data = rcar_pcie_phy_init_gen3 },
+ { .compatible = "renesas,pcie-rcar-gen3",
+ .data = rcar_pcie_phy_init_gen3 },
+ {},
+};
+
+static int rcar_pcie_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rcar_pcie *pcie;
+ u32 data;
+ int err;
+ struct pci_host_bridge *bridge;
+
+ bridge = pci_alloc_host_bridge(sizeof(*pcie));
+ if (!bridge)
+ return -ENOMEM;
+
+ pcie = pci_host_bridge_priv(bridge);
+
+ pcie->dev = dev;
+ platform_set_drvdata(pdev, pcie);
+
+ err = pci_parse_request_of_pci_ranges(dev, &pcie->resources,
+ &bridge->dma_ranges, NULL);
+ if (err)
+ goto err_free_bridge;
+
+ pm_runtime_enable(pcie->dev);
+ err = pm_runtime_get_sync(pcie->dev);
+ if (err < 0) {
+ dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
+ goto err_pm_disable;
+ }
+
+ err = rcar_pcie_get_resources(pcie);
+ if (err < 0) {
+ dev_err(dev, "failed to request resources: %d\n", err);
+ goto err_pm_put;
+ }
+
+ err = clk_prepare_enable(pcie->bus_clk);
+ if (err) {
+ dev_err(dev, "failed to enable bus clock: %d\n", err);
+ goto err_unmap_msi_irqs;
+ }
+
+ err = rcar_pcie_parse_map_dma_ranges(pcie);
+ if (err)
+ goto err_clk_disable;
+
+ pcie->phy_init_fn = of_device_get_match_data(dev);
+ err = pcie->phy_init_fn(pcie);
+ if (err) {
+ dev_err(dev, "failed to init PCIe PHY\n");
+ goto err_clk_disable;
+ }
+
+ /* Failure to get a link might just be that no cards are inserted */
+ if (rcar_pcie_hw_init(pcie)) {
+ dev_info(dev, "PCIe link down\n");
+ err = -ENODEV;
+ goto err_phy_shutdown;
+ }
+
+ data = rcar_pci_read_reg(pcie, MACSR);
+ dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ err = rcar_pcie_enable_msi(pcie);
+ if (err < 0) {
+ dev_err(dev,
+ "failed to enable MSI support: %d\n",
+ err);
+ goto err_phy_shutdown;
+ }
+ }
+
+ err = rcar_pcie_enable(pcie);
+ if (err)
+ goto err_msi_teardown;
+
+ return 0;
+
+err_msi_teardown:
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ rcar_pcie_teardown_msi(pcie);
+
+err_phy_shutdown:
+ if (pcie->phy) {
+ phy_power_off(pcie->phy);
+ phy_exit(pcie->phy);
+ }
+
+err_clk_disable:
+ clk_disable_unprepare(pcie->bus_clk);
+
+err_unmap_msi_irqs:
+ irq_dispose_mapping(pcie->msi.irq2);
+ irq_dispose_mapping(pcie->msi.irq1);
+
+err_pm_put:
+ pm_runtime_put(dev);
+
+err_pm_disable:
+ pm_runtime_disable(dev);
+ pci_free_resource_list(&pcie->resources);
+
+err_free_bridge:
+ pci_free_host_bridge(bridge);
+
+ return err;
+}
+
+static int __maybe_unused rcar_pcie_resume(struct device *dev)
+{
+ struct rcar_pcie *pcie = dev_get_drvdata(dev);
+ unsigned int data;
+ int err;
+
+ err = rcar_pcie_parse_map_dma_ranges(pcie);
+ if (err)
+ return 0;
+
+ /* Failure to get a link might just be that no cards are inserted */
+ err = pcie->phy_init_fn(pcie);
+ if (err) {
+ dev_info(dev, "PCIe link down\n");
+ return 0;
+ }
+
+ data = rcar_pci_read_reg(pcie, MACSR);
+ dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
+
+ /* Enable MSI */
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ rcar_pcie_hw_enable_msi(pcie);
+
+ rcar_pcie_hw_enable(pcie);
+
+ return 0;
+}
+
+static int rcar_pcie_resume_noirq(struct device *dev)
+{
+ struct rcar_pcie *pcie = dev_get_drvdata(dev);
+
+ if (rcar_pci_read_reg(pcie, PMSR) &&
+ !(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN))
+ return 0;
+
+ /* Re-establish the PCIe link */
+ rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
+ rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
+ return rcar_pcie_wait_for_dl(pcie);
+}
+
+static const struct dev_pm_ops rcar_pcie_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(NULL, rcar_pcie_resume)
+ .resume_noirq = rcar_pcie_resume_noirq,
+};
+
+static struct platform_driver rcar_pcie_driver = {
+ .driver = {
+ .name = "rcar-pcie",
+ .of_match_table = rcar_pcie_of_match,
+ .pm = &rcar_pcie_pm_ops,
+ .suppress_bind_attrs = true,
+ },
+ .probe = rcar_pcie_probe,
+};
+builtin_platform_driver(rcar_pcie_driver);
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * PCIe driver for Renesas R-Car SoCs
- * Copyright (C) 2014 Renesas Electronics Europe Ltd
- *
- * Based on:
- * arch/sh/drivers/pci/pcie-sh7786.c
- * arch/sh/drivers/pci/ops-sh7786.c
- * Copyright (C) 2009 - 2011 Paul Mundt
- *
- * Author: Phil Edworthy <phil.edworthy@renesas.com>
- */
-
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/msi.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/of_pci.h>
-#include <linux/of_platform.h>
-#include <linux/pci.h>
-#include <linux/phy/phy.h>
-#include <linux/platform_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/slab.h>
-
-#define PCIECAR 0x000010
-#define PCIECCTLR 0x000018
-#define CONFIG_SEND_ENABLE BIT(31)
-#define TYPE0 (0 << 8)
-#define TYPE1 BIT(8)
-#define PCIECDR 0x000020
-#define PCIEMSR 0x000028
-#define PCIEINTXR 0x000400
-#define PCIEPHYSR 0x0007f0
-#define PHYRDY BIT(0)
-#define PCIEMSITXR 0x000840
-
-/* Transfer control */
-#define PCIETCTLR 0x02000
-#define DL_DOWN BIT(3)
-#define CFINIT BIT(0)
-#define PCIETSTR 0x02004
-#define DATA_LINK_ACTIVE BIT(0)
-#define PCIEERRFR 0x02020
-#define UNSUPPORTED_REQUEST BIT(4)
-#define PCIEMSIFR 0x02044
-#define PCIEMSIALR 0x02048
-#define MSIFE BIT(0)
-#define PCIEMSIAUR 0x0204c
-#define PCIEMSIIER 0x02050
-
-/* root port address */
-#define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
-
-/* local address reg & mask */
-#define PCIELAR(x) (0x02200 + ((x) * 0x20))
-#define PCIELAMR(x) (0x02208 + ((x) * 0x20))
-#define LAM_PREFETCH BIT(3)
-#define LAM_64BIT BIT(2)
-#define LAR_ENABLE BIT(1)
-
-/* PCIe address reg & mask */
-#define PCIEPALR(x) (0x03400 + ((x) * 0x20))
-#define PCIEPAUR(x) (0x03404 + ((x) * 0x20))
-#define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
-#define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
-#define PAR_ENABLE BIT(31)
-#define IO_SPACE BIT(8)
-
-/* Configuration */
-#define PCICONF(x) (0x010000 + ((x) * 0x4))
-#define PMCAP(x) (0x010040 + ((x) * 0x4))
-#define EXPCAP(x) (0x010070 + ((x) * 0x4))
-#define VCCAP(x) (0x010100 + ((x) * 0x4))
-
-/* link layer */
-#define IDSETR1 0x011004
-#define TLCTLR 0x011048
-#define MACSR 0x011054
-#define SPCHGFIN BIT(4)
-#define SPCHGFAIL BIT(6)
-#define SPCHGSUC BIT(7)
-#define LINK_SPEED (0xf << 16)
-#define LINK_SPEED_2_5GTS (1 << 16)
-#define LINK_SPEED_5_0GTS (2 << 16)
-#define MACCTLR 0x011058
-#define MACCTLR_NFTS_MASK GENMASK(23, 16) /* The name is from SH7786 */
-#define SPEED_CHANGE BIT(24)
-#define SCRAMBLE_DISABLE BIT(27)
-#define LTSMDIS BIT(31)
-#define MACCTLR_INIT_VAL (LTSMDIS | MACCTLR_NFTS_MASK)
-#define PMSR 0x01105c
-#define MACS2R 0x011078
-#define MACCGSPSETR 0x011084
-#define SPCNGRSN BIT(31)
-
-/* R-Car H1 PHY */
-#define H1_PCIEPHYADRR 0x04000c
-#define WRITE_CMD BIT(16)
-#define PHY_ACK BIT(24)
-#define RATE_POS 12
-#define LANE_POS 8
-#define ADR_POS 0
-#define H1_PCIEPHYDOUTR 0x040014
-
-/* R-Car Gen2 PHY */
-#define GEN2_PCIEPHYADDR 0x780
-#define GEN2_PCIEPHYDATA 0x784
-#define GEN2_PCIEPHYCTRL 0x78c
-
-#define INT_PCI_MSI_NR 32
-
-#define RCONF(x) (PCICONF(0) + (x))
-#define RPMCAP(x) (PMCAP(0) + (x))
-#define REXPCAP(x) (EXPCAP(0) + (x))
-#define RVCCAP(x) (VCCAP(0) + (x))
-
-#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
-#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
-#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
-
-#define RCAR_PCI_MAX_RESOURCES 4
-#define MAX_NR_INBOUND_MAPS 6
-
-struct rcar_msi {
- DECLARE_BITMAP(used, INT_PCI_MSI_NR);
- struct irq_domain *domain;
- struct msi_controller chip;
- unsigned long pages;
- struct mutex lock;
- int irq1;
- int irq2;
-};
-
-static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip)
-{
- return container_of(chip, struct rcar_msi, chip);
-}
-
-/* Structure representing the PCIe interface */
-struct rcar_pcie {
- struct device *dev;
- struct phy *phy;
- void __iomem *base;
- struct list_head resources;
- int root_bus_nr;
- struct clk *bus_clk;
- struct rcar_msi msi;
- int (*phy_init_fn)(struct rcar_pcie *pcie);
-};
-
-static void rcar_pci_write_reg(struct rcar_pcie *pcie, u32 val,
- unsigned int reg)
-{
- writel(val, pcie->base + reg);
-}
-
-static u32 rcar_pci_read_reg(struct rcar_pcie *pcie, unsigned int reg)
-{
- return readl(pcie->base + reg);
-}
-
-enum {
- RCAR_PCI_ACCESS_READ,
- RCAR_PCI_ACCESS_WRITE,
-};
-
-static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
-{
- unsigned int shift = BITS_PER_BYTE * (where & 3);
- u32 val = rcar_pci_read_reg(pcie, where & ~3);
-
- val &= ~(mask << shift);
- val |= data << shift;
- rcar_pci_write_reg(pcie, val, where & ~3);
-}
-
-static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
-{
- unsigned int shift = BITS_PER_BYTE * (where & 3);
- u32 val = rcar_pci_read_reg(pcie, where & ~3);
-
- return val >> shift;
-}
-
-/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
-static int rcar_pcie_config_access(struct rcar_pcie *pcie,
- unsigned char access_type, struct pci_bus *bus,
- unsigned int devfn, int where, u32 *data)
-{
- unsigned int dev, func, reg, index;
-
- dev = PCI_SLOT(devfn);
- func = PCI_FUNC(devfn);
- reg = where & ~3;
- index = reg / 4;
-
- /*
- * While each channel has its own memory-mapped extended config
- * space, it's generally only accessible when in endpoint mode.
- * When in root complex mode, the controller is unable to target
- * itself with either type 0 or type 1 accesses, and indeed, any
- * controller initiated target transfer to its own config space
- * result in a completer abort.
- *
- * Each channel effectively only supports a single device, but as
- * the same channel <-> device access works for any PCI_SLOT()
- * value, we cheat a bit here and bind the controller's config
- * space to devfn 0 in order to enable self-enumeration. In this
- * case the regular ECAR/ECDR path is sidelined and the mangled
- * config access itself is initiated as an internal bus transaction.
- */
- if (pci_is_root_bus(bus)) {
- if (dev != 0)
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- if (access_type == RCAR_PCI_ACCESS_READ) {
- *data = rcar_pci_read_reg(pcie, PCICONF(index));
- } else {
- /* Keep an eye out for changes to the root bus number */
- if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS))
- pcie->root_bus_nr = *data & 0xff;
-
- rcar_pci_write_reg(pcie, *data, PCICONF(index));
- }
-
- return PCIBIOS_SUCCESSFUL;
- }
-
- if (pcie->root_bus_nr < 0)
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- /* Clear errors */
- rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
-
- /* Set the PIO address */
- rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) |
- PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR);
-
- /* Enable the configuration access */
- if (bus->parent->number == pcie->root_bus_nr)
- rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
- else
- rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);
-
- /* Check for errors */
- if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- /* Check for master and target aborts */
- if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
- (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- if (access_type == RCAR_PCI_ACCESS_READ)
- *data = rcar_pci_read_reg(pcie, PCIECDR);
- else
- rcar_pci_write_reg(pcie, *data, PCIECDR);
-
- /* Disable the configuration access */
- rcar_pci_write_reg(pcie, 0, PCIECCTLR);
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
- int where, int size, u32 *val)
-{
- struct rcar_pcie *pcie = bus->sysdata;
- int ret;
-
- ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
- bus, devfn, where, val);
- if (ret != PCIBIOS_SUCCESSFUL) {
- *val = 0xffffffff;
- return ret;
- }
-
- if (size == 1)
- *val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;
- else if (size == 2)
- *val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff;
-
- dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
- bus->number, devfn, where, size, *val);
-
- return ret;
-}
-
-/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
-static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
- int where, int size, u32 val)
-{
- struct rcar_pcie *pcie = bus->sysdata;
- unsigned int shift;
- u32 data;
- int ret;
-
- ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
- bus, devfn, where, &data);
- if (ret != PCIBIOS_SUCCESSFUL)
- return ret;
-
- dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
- bus->number, devfn, where, size, val);
-
- 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;
-
- ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_WRITE,
- bus, devfn, where, &data);
-
- return ret;
-}
-
-static struct pci_ops rcar_pcie_ops = {
- .read = rcar_pcie_read_conf,
- .write = rcar_pcie_write_conf,
-};
-
-static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie,
- struct resource_entry *window)
-{
- /* Setup PCIe address space mappings for each resource */
- resource_size_t size;
- resource_size_t res_start;
- struct resource *res = window->res;
- u32 mask;
-
- rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));
-
- /*
- * The PAMR mask is calculated in units of 128Bytes, which
- * keeps things pretty simple.
- */
- size = resource_size(res);
- mask = (roundup_pow_of_two(size) / SZ_128) - 1;
- rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
-
- if (res->flags & IORESOURCE_IO)
- res_start = pci_pio_to_address(res->start) - window->offset;
- else
- res_start = res->start - window->offset;
-
- rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win));
- rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F,
- PCIEPALR(win));
-
- /* First resource is for IO */
- mask = PAR_ENABLE;
- if (res->flags & IORESOURCE_IO)
- mask |= IO_SPACE;
-
- rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
-}
-
-static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pci)
-{
- struct resource_entry *win;
- int i = 0;
-
- /* Setup PCI resources */
- resource_list_for_each_entry(win, &pci->resources) {
- struct resource *res = win->res;
-
- if (!res->flags)
- continue;
-
- switch (resource_type(res)) {
- case IORESOURCE_IO:
- case IORESOURCE_MEM:
- rcar_pcie_setup_window(i, pci, win);
- i++;
- break;
- case IORESOURCE_BUS:
- pci->root_bus_nr = res->start;
- break;
- default:
- continue;
- }
-
- pci_add_resource(resource, res);
- }
-
- return 1;
-}
-
-static void rcar_pcie_force_speedup(struct rcar_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- unsigned int timeout = 1000;
- u32 macsr;
-
- if ((rcar_pci_read_reg(pcie, MACS2R) & LINK_SPEED) != LINK_SPEED_5_0GTS)
- return;
-
- if (rcar_pci_read_reg(pcie, MACCTLR) & SPEED_CHANGE) {
- dev_err(dev, "Speed change already in progress\n");
- return;
- }
-
- macsr = rcar_pci_read_reg(pcie, MACSR);
- if ((macsr & LINK_SPEED) == LINK_SPEED_5_0GTS)
- goto done;
-
- /* Set target link speed to 5.0 GT/s */
- rcar_rmw32(pcie, EXPCAP(12), PCI_EXP_LNKSTA_CLS,
- PCI_EXP_LNKSTA_CLS_5_0GB);
-
- /* Set speed change reason as intentional factor */
- rcar_rmw32(pcie, MACCGSPSETR, SPCNGRSN, 0);
-
- /* Clear SPCHGFIN, SPCHGSUC, and SPCHGFAIL */
- if (macsr & (SPCHGFIN | SPCHGSUC | SPCHGFAIL))
- rcar_pci_write_reg(pcie, macsr, MACSR);
-
- /* Start link speed change */
- rcar_rmw32(pcie, MACCTLR, SPEED_CHANGE, SPEED_CHANGE);
-
- while (timeout--) {
- macsr = rcar_pci_read_reg(pcie, MACSR);
- if (macsr & SPCHGFIN) {
- /* Clear the interrupt bits */
- rcar_pci_write_reg(pcie, macsr, MACSR);
-
- if (macsr & SPCHGFAIL)
- dev_err(dev, "Speed change failed\n");
-
- goto done;
- }
-
- msleep(1);
- }
-
- dev_err(dev, "Speed change timed out\n");
-
-done:
- dev_info(dev, "Current link speed is %s GT/s\n",
- (macsr & LINK_SPEED) == LINK_SPEED_5_0GTS ? "5" : "2.5");
-}
-
-static void rcar_pcie_hw_enable(struct rcar_pcie *pci)
-{
- struct resource_entry *win;
- LIST_HEAD(res);
- int i = 0;
-
- /* Try setting 5 GT/s link speed */
- rcar_pcie_force_speedup(pci);
-
- /* Setup PCI resources */
- resource_list_for_each_entry(win, &pci->resources) {
- struct resource *res = win->res;
-
- if (!res->flags)
- continue;
-
- switch (resource_type(res)) {
- case IORESOURCE_IO:
- case IORESOURCE_MEM:
- rcar_pcie_setup_window(i, pci, win);
- i++;
- break;
- }
- }
-}
-
-static int rcar_pcie_enable(struct rcar_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
- struct pci_bus *bus, *child;
- int ret;
-
- /* Try setting 5 GT/s link speed */
- rcar_pcie_force_speedup(pcie);
-
- rcar_pcie_setup(&bridge->windows, pcie);
-
- pci_add_flags(PCI_REASSIGN_ALL_BUS);
-
- bridge->dev.parent = dev;
- bridge->sysdata = pcie;
- bridge->busnr = pcie->root_bus_nr;
- bridge->ops = &rcar_pcie_ops;
- bridge->map_irq = of_irq_parse_and_map_pci;
- bridge->swizzle_irq = pci_common_swizzle;
- if (IS_ENABLED(CONFIG_PCI_MSI))
- bridge->msi = &pcie->msi.chip;
-
- ret = pci_scan_root_bus_bridge(bridge);
- if (ret < 0)
- return ret;
-
- bus = bridge->bus;
-
- pci_bus_size_bridges(bus);
- pci_bus_assign_resources(bus);
-
- list_for_each_entry(child, &bus->children, node)
- pcie_bus_configure_settings(child);
-
- pci_bus_add_devices(bus);
-
- return 0;
-}
-
-static int phy_wait_for_ack(struct rcar_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- unsigned int timeout = 100;
-
- while (timeout--) {
- if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
- return 0;
-
- udelay(100);
- }
-
- dev_err(dev, "Access to PCIe phy timed out\n");
-
- return -ETIMEDOUT;
-}
-
-static void phy_write_reg(struct rcar_pcie *pcie,
- unsigned int rate, u32 addr,
- unsigned int lane, u32 data)
-{
- u32 phyaddr;
-
- phyaddr = WRITE_CMD |
- ((rate & 1) << RATE_POS) |
- ((lane & 0xf) << LANE_POS) |
- ((addr & 0xff) << ADR_POS);
-
- /* Set write data */
- rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
- rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
-
- /* Ignore errors as they will be dealt with if the data link is down */
- phy_wait_for_ack(pcie);
-
- /* Clear command */
- rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
- rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
-
- /* Ignore errors as they will be dealt with if the data link is down */
- phy_wait_for_ack(pcie);
-}
-
-static int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie)
-{
- unsigned int timeout = 10;
-
- while (timeout--) {
- if (rcar_pci_read_reg(pcie, PCIEPHYSR) & PHYRDY)
- return 0;
-
- msleep(5);
- }
-
- return -ETIMEDOUT;
-}
-
-static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
-{
- unsigned int timeout = 10000;
-
- while (timeout--) {
- if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
- return 0;
-
- udelay(5);
- cpu_relax();
- }
-
- return -ETIMEDOUT;
-}
-
-static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
-{
- int err;
-
- /* Begin initialization */
- rcar_pci_write_reg(pcie, 0, PCIETCTLR);
-
- /* Set mode */
- rcar_pci_write_reg(pcie, 1, PCIEMSR);
-
- err = rcar_pcie_wait_for_phyrdy(pcie);
- if (err)
- return err;
-
- /*
- * Initial header for port config space is type 1, set the device
- * class to match. Hardware takes care of propagating the IDSETR
- * settings, so there is no need to bother with a quirk.
- */
- rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1);
-
- /*
- * Setup Secondary Bus Number & Subordinate Bus Number, even though
- * they aren't used, to avoid bridge being detected as broken.
- */
- rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
- rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
-
- /* Initialize default capabilities. */
- rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
- rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
- PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
- rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f,
- PCI_HEADER_TYPE_BRIDGE);
-
- /* Enable data link layer active state reporting */
- rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC,
- PCI_EXP_LNKCAP_DLLLARC);
-
- /* Write out the physical slot number = 0 */
- rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);
-
- /* Set the completion timer timeout to the maximum 50ms. */
- rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50);
-
- /* Terminate list of capabilities (Next Capability Offset=0) */
- rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0);
-
- /* Enable MSI */
- if (IS_ENABLED(CONFIG_PCI_MSI))
- rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR);
-
- rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
-
- /* Finish initialization - establish a PCI Express link */
- rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
-
- /* This will timeout if we don't have a link. */
- err = rcar_pcie_wait_for_dl(pcie);
- if (err)
- return err;
-
- /* Enable INTx interrupts */
- rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);
-
- wmb();
-
- return 0;
-}
-
-static int rcar_pcie_phy_init_h1(struct rcar_pcie *pcie)
-{
- /* Initialize the phy */
- phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
- phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
- phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
- phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
- phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
- phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
- phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
- phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
- phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
- phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
- phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
- phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);
-
- phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
- phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
- phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);
-
- return 0;
-}
-
-static int rcar_pcie_phy_init_gen2(struct rcar_pcie *pcie)
-{
- /*
- * These settings come from the R-Car Series, 2nd Generation User's
- * Manual, section 50.3.1 (2) Initialization of the physical layer.
- */
- rcar_pci_write_reg(pcie, 0x000f0030, GEN2_PCIEPHYADDR);
- rcar_pci_write_reg(pcie, 0x00381203, GEN2_PCIEPHYDATA);
- rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
- rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
-
- rcar_pci_write_reg(pcie, 0x000f0054, GEN2_PCIEPHYADDR);
- /* The following value is for DC connection, no termination resistor */
- rcar_pci_write_reg(pcie, 0x13802007, GEN2_PCIEPHYDATA);
- rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
- rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
-
- return 0;
-}
-
-static int rcar_pcie_phy_init_gen3(struct rcar_pcie *pcie)
-{
- int err;
-
- err = phy_init(pcie->phy);
- if (err)
- return err;
-
- err = phy_power_on(pcie->phy);
- if (err)
- phy_exit(pcie->phy);
-
- return err;
-}
-
-static int rcar_msi_alloc(struct rcar_msi *chip)
-{
- int msi;
-
- mutex_lock(&chip->lock);
-
- msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
- if (msi < INT_PCI_MSI_NR)
- set_bit(msi, chip->used);
- else
- msi = -ENOSPC;
-
- mutex_unlock(&chip->lock);
-
- return msi;
-}
-
-static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs)
-{
- int msi;
-
- mutex_lock(&chip->lock);
- msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR,
- order_base_2(no_irqs));
- mutex_unlock(&chip->lock);
-
- return msi;
-}
-
-static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
-{
- mutex_lock(&chip->lock);
- clear_bit(irq, chip->used);
- mutex_unlock(&chip->lock);
-}
-
-static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
-{
- struct rcar_pcie *pcie = data;
- struct rcar_msi *msi = &pcie->msi;
- struct device *dev = pcie->dev;
- unsigned long reg;
-
- reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
-
- /* MSI & INTx share an interrupt - we only handle MSI here */
- if (!reg)
- return IRQ_NONE;
-
- while (reg) {
- unsigned int index = find_first_bit(®, 32);
- unsigned int msi_irq;
-
- /* clear the interrupt */
- rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);
-
- msi_irq = irq_find_mapping(msi->domain, index);
- if (msi_irq) {
- if (test_bit(index, msi->used))
- generic_handle_irq(msi_irq);
- else
- dev_info(dev, "unhandled MSI\n");
- } else {
- /* Unknown MSI, just clear it */
- dev_dbg(dev, "unexpected MSI\n");
- }
-
- /* see if there's any more pending in this vector */
- reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
- }
-
- return IRQ_HANDLED;
-}
-
-static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
- struct msi_desc *desc)
-{
- struct rcar_msi *msi = to_rcar_msi(chip);
- struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
- struct msi_msg msg;
- unsigned int irq;
- int hwirq;
-
- hwirq = rcar_msi_alloc(msi);
- if (hwirq < 0)
- return hwirq;
-
- irq = irq_find_mapping(msi->domain, hwirq);
- if (!irq) {
- rcar_msi_free(msi, hwirq);
- return -EINVAL;
- }
-
- irq_set_msi_desc(irq, desc);
-
- msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
- msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
- msg.data = hwirq;
-
- pci_write_msi_msg(irq, &msg);
-
- return 0;
-}
-
-static int rcar_msi_setup_irqs(struct msi_controller *chip,
- struct pci_dev *pdev, int nvec, int type)
-{
- struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
- struct rcar_msi *msi = to_rcar_msi(chip);
- struct msi_desc *desc;
- struct msi_msg msg;
- unsigned int irq;
- int hwirq;
- int i;
-
- /* MSI-X interrupts are not supported */
- if (type == PCI_CAP_ID_MSIX)
- return -EINVAL;
-
- WARN_ON(!list_is_singular(&pdev->dev.msi_list));
- desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
-
- hwirq = rcar_msi_alloc_region(msi, nvec);
- if (hwirq < 0)
- return -ENOSPC;
-
- irq = irq_find_mapping(msi->domain, hwirq);
- if (!irq)
- return -ENOSPC;
-
- for (i = 0; i < nvec; i++) {
- /*
- * irq_create_mapping() called from rcar_pcie_probe() pre-
- * allocates descs, so there is no need to allocate descs here.
- * We can therefore assume that if irq_find_mapping() above
- * returns non-zero, then the descs are also successfully
- * allocated.
- */
- if (irq_set_msi_desc_off(irq, i, desc)) {
- /* TODO: clear */
- return -EINVAL;
- }
- }
-
- desc->nvec_used = nvec;
- desc->msi_attrib.multiple = order_base_2(nvec);
-
- msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
- msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
- msg.data = hwirq;
-
- pci_write_msi_msg(irq, &msg);
-
- return 0;
-}
-
-static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
-{
- struct rcar_msi *msi = to_rcar_msi(chip);
- struct irq_data *d = irq_get_irq_data(irq);
-
- rcar_msi_free(msi, d->hwirq);
-}
-
-static struct irq_chip rcar_msi_irq_chip = {
- .name = "R-Car PCIe MSI",
- .irq_enable = pci_msi_unmask_irq,
- .irq_disable = pci_msi_mask_irq,
- .irq_mask = pci_msi_mask_irq,
- .irq_unmask = pci_msi_unmask_irq,
-};
-
-static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
- irq_hw_number_t hwirq)
-{
- irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
- irq_set_chip_data(irq, domain->host_data);
-
- return 0;
-}
-
-static const struct irq_domain_ops msi_domain_ops = {
- .map = rcar_msi_map,
-};
-
-static void rcar_pcie_unmap_msi(struct rcar_pcie *pcie)
-{
- struct rcar_msi *msi = &pcie->msi;
- int i, irq;
-
- for (i = 0; i < INT_PCI_MSI_NR; i++) {
- irq = irq_find_mapping(msi->domain, i);
- if (irq > 0)
- irq_dispose_mapping(irq);
- }
-
- irq_domain_remove(msi->domain);
-}
-
-static void rcar_pcie_hw_enable_msi(struct rcar_pcie *pcie)
-{
- struct rcar_msi *msi = &pcie->msi;
- unsigned long base;
-
- /* setup MSI data target */
- base = virt_to_phys((void *)msi->pages);
-
- rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR);
- rcar_pci_write_reg(pcie, upper_32_bits(base), PCIEMSIAUR);
-
- /* enable all MSI interrupts */
- rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
-}
-
-static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- struct rcar_msi *msi = &pcie->msi;
- int err, i;
-
- mutex_init(&msi->lock);
-
- msi->chip.dev = dev;
- msi->chip.setup_irq = rcar_msi_setup_irq;
- msi->chip.setup_irqs = rcar_msi_setup_irqs;
- msi->chip.teardown_irq = rcar_msi_teardown_irq;
-
- msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
- &msi_domain_ops, &msi->chip);
- if (!msi->domain) {
- dev_err(dev, "failed to create IRQ domain\n");
- return -ENOMEM;
- }
-
- for (i = 0; i < INT_PCI_MSI_NR; i++)
- irq_create_mapping(msi->domain, i);
-
- /* Two irqs are for MSI, but they are also used for non-MSI irqs */
- err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq,
- IRQF_SHARED | IRQF_NO_THREAD,
- rcar_msi_irq_chip.name, pcie);
- if (err < 0) {
- dev_err(dev, "failed to request IRQ: %d\n", err);
- goto err;
- }
-
- err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq,
- IRQF_SHARED | IRQF_NO_THREAD,
- rcar_msi_irq_chip.name, pcie);
- if (err < 0) {
- dev_err(dev, "failed to request IRQ: %d\n", err);
- goto err;
- }
-
- /* setup MSI data target */
- msi->pages = __get_free_pages(GFP_KERNEL, 0);
- rcar_pcie_hw_enable_msi(pcie);
-
- return 0;
-
-err:
- rcar_pcie_unmap_msi(pcie);
- return err;
-}
-
-static void rcar_pcie_teardown_msi(struct rcar_pcie *pcie)
-{
- struct rcar_msi *msi = &pcie->msi;
-
- /* Disable all MSI interrupts */
- rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
-
- /* Disable address decoding of the MSI interrupt, MSIFE */
- rcar_pci_write_reg(pcie, 0, PCIEMSIALR);
-
- free_pages(msi->pages, 0);
-
- rcar_pcie_unmap_msi(pcie);
-}
-
-static int rcar_pcie_get_resources(struct rcar_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- struct resource res;
- int err, i;
-
- pcie->phy = devm_phy_optional_get(dev, "pcie");
- if (IS_ERR(pcie->phy))
- return PTR_ERR(pcie->phy);
-
- err = of_address_to_resource(dev->of_node, 0, &res);
- if (err)
- return err;
-
- pcie->base = devm_ioremap_resource(dev, &res);
- if (IS_ERR(pcie->base))
- return PTR_ERR(pcie->base);
-
- pcie->bus_clk = devm_clk_get(dev, "pcie_bus");
- if (IS_ERR(pcie->bus_clk)) {
- dev_err(dev, "cannot get pcie bus clock\n");
- return PTR_ERR(pcie->bus_clk);
- }
-
- i = irq_of_parse_and_map(dev->of_node, 0);
- if (!i) {
- dev_err(dev, "cannot get platform resources for msi interrupt\n");
- err = -ENOENT;
- goto err_irq1;
- }
- pcie->msi.irq1 = i;
-
- i = irq_of_parse_and_map(dev->of_node, 1);
- if (!i) {
- dev_err(dev, "cannot get platform resources for msi interrupt\n");
- err = -ENOENT;
- goto err_irq2;
- }
- pcie->msi.irq2 = i;
-
- return 0;
-
-err_irq2:
- irq_dispose_mapping(pcie->msi.irq1);
-err_irq1:
- return err;
-}
-
-static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
- struct resource_entry *entry,
- int *index)
-{
- u64 restype = entry->res->flags;
- u64 cpu_addr = entry->res->start;
- u64 cpu_end = entry->res->end;
- u64 pci_addr = entry->res->start - entry->offset;
- u32 flags = LAM_64BIT | LAR_ENABLE;
- u64 mask;
- u64 size = resource_size(entry->res);
- int idx = *index;
-
- if (restype & IORESOURCE_PREFETCH)
- flags |= LAM_PREFETCH;
-
- while (cpu_addr < cpu_end) {
- if (idx >= MAX_NR_INBOUND_MAPS - 1) {
- dev_err(pcie->dev, "Failed to map inbound regions!\n");
- return -EINVAL;
- }
- /*
- * If the size of the range is larger than the alignment of
- * the start address, we have to use multiple entries to
- * perform the mapping.
- */
- if (cpu_addr > 0) {
- unsigned long nr_zeros = __ffs64(cpu_addr);
- u64 alignment = 1ULL << nr_zeros;
-
- size = min(size, alignment);
- }
- /* Hardware supports max 4GiB inbound region */
- size = min(size, 1ULL << 32);
-
- mask = roundup_pow_of_two(size) - 1;
- mask &= ~0xf;
-
- /*
- * Set up 64-bit inbound regions as the range parser doesn't
- * distinguish between 32 and 64-bit types.
- */
- rcar_pci_write_reg(pcie, lower_32_bits(pci_addr),
- PCIEPRAR(idx));
- rcar_pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
- rcar_pci_write_reg(pcie, lower_32_bits(mask) | flags,
- PCIELAMR(idx));
-
- rcar_pci_write_reg(pcie, upper_32_bits(pci_addr),
- PCIEPRAR(idx + 1));
- rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr),
- PCIELAR(idx + 1));
- rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1));
-
- pci_addr += size;
- cpu_addr += size;
- idx += 2;
- }
- *index = idx;
-
- return 0;
-}
-
-static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie)
-{
- struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
- struct resource_entry *entry;
- int index = 0, err = 0;
-
- resource_list_for_each_entry(entry, &bridge->dma_ranges) {
- err = rcar_pcie_inbound_ranges(pcie, entry, &index);
- if (err)
- break;
- }
-
- return err;
-}
-
-static const struct of_device_id rcar_pcie_of_match[] = {
- { .compatible = "renesas,pcie-r8a7779",
- .data = rcar_pcie_phy_init_h1 },
- { .compatible = "renesas,pcie-r8a7790",
- .data = rcar_pcie_phy_init_gen2 },
- { .compatible = "renesas,pcie-r8a7791",
- .data = rcar_pcie_phy_init_gen2 },
- { .compatible = "renesas,pcie-rcar-gen2",
- .data = rcar_pcie_phy_init_gen2 },
- { .compatible = "renesas,pcie-r8a7795",
- .data = rcar_pcie_phy_init_gen3 },
- { .compatible = "renesas,pcie-rcar-gen3",
- .data = rcar_pcie_phy_init_gen3 },
- {},
-};
-
-static int rcar_pcie_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct rcar_pcie *pcie;
- u32 data;
- int err;
- struct pci_host_bridge *bridge;
-
- bridge = pci_alloc_host_bridge(sizeof(*pcie));
- if (!bridge)
- return -ENOMEM;
-
- pcie = pci_host_bridge_priv(bridge);
-
- pcie->dev = dev;
- platform_set_drvdata(pdev, pcie);
-
- err = pci_parse_request_of_pci_ranges(dev, &pcie->resources,
- &bridge->dma_ranges, NULL);
- if (err)
- goto err_free_bridge;
-
- pm_runtime_enable(pcie->dev);
- err = pm_runtime_get_sync(pcie->dev);
- if (err < 0) {
- dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
- goto err_pm_disable;
- }
-
- err = rcar_pcie_get_resources(pcie);
- if (err < 0) {
- dev_err(dev, "failed to request resources: %d\n", err);
- goto err_pm_put;
- }
-
- err = clk_prepare_enable(pcie->bus_clk);
- if (err) {
- dev_err(dev, "failed to enable bus clock: %d\n", err);
- goto err_unmap_msi_irqs;
- }
-
- err = rcar_pcie_parse_map_dma_ranges(pcie);
- if (err)
- goto err_clk_disable;
-
- pcie->phy_init_fn = of_device_get_match_data(dev);
- err = pcie->phy_init_fn(pcie);
- if (err) {
- dev_err(dev, "failed to init PCIe PHY\n");
- goto err_clk_disable;
- }
-
- /* Failure to get a link might just be that no cards are inserted */
- if (rcar_pcie_hw_init(pcie)) {
- dev_info(dev, "PCIe link down\n");
- err = -ENODEV;
- goto err_phy_shutdown;
- }
-
- data = rcar_pci_read_reg(pcie, MACSR);
- dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
-
- if (IS_ENABLED(CONFIG_PCI_MSI)) {
- err = rcar_pcie_enable_msi(pcie);
- if (err < 0) {
- dev_err(dev,
- "failed to enable MSI support: %d\n",
- err);
- goto err_phy_shutdown;
- }
- }
-
- err = rcar_pcie_enable(pcie);
- if (err)
- goto err_msi_teardown;
-
- return 0;
-
-err_msi_teardown:
- if (IS_ENABLED(CONFIG_PCI_MSI))
- rcar_pcie_teardown_msi(pcie);
-
-err_phy_shutdown:
- if (pcie->phy) {
- phy_power_off(pcie->phy);
- phy_exit(pcie->phy);
- }
-
-err_clk_disable:
- clk_disable_unprepare(pcie->bus_clk);
-
-err_unmap_msi_irqs:
- irq_dispose_mapping(pcie->msi.irq2);
- irq_dispose_mapping(pcie->msi.irq1);
-
-err_pm_put:
- pm_runtime_put(dev);
-
-err_pm_disable:
- pm_runtime_disable(dev);
- pci_free_resource_list(&pcie->resources);
-
-err_free_bridge:
- pci_free_host_bridge(bridge);
-
- return err;
-}
-
-static int __maybe_unused rcar_pcie_resume(struct device *dev)
-{
- struct rcar_pcie *pcie = dev_get_drvdata(dev);
- unsigned int data;
- int err;
-
- err = rcar_pcie_parse_map_dma_ranges(pcie);
- if (err)
- return 0;
-
- /* Failure to get a link might just be that no cards are inserted */
- err = pcie->phy_init_fn(pcie);
- if (err) {
- dev_info(dev, "PCIe link down\n");
- return 0;
- }
-
- data = rcar_pci_read_reg(pcie, MACSR);
- dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
-
- /* Enable MSI */
- if (IS_ENABLED(CONFIG_PCI_MSI))
- rcar_pcie_hw_enable_msi(pcie);
-
- rcar_pcie_hw_enable(pcie);
-
- return 0;
-}
-
-static int rcar_pcie_resume_noirq(struct device *dev)
-{
- struct rcar_pcie *pcie = dev_get_drvdata(dev);
-
- if (rcar_pci_read_reg(pcie, PMSR) &&
- !(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN))
- return 0;
-
- /* Re-establish the PCIe link */
- rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
- rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
- return rcar_pcie_wait_for_dl(pcie);
-}
-
-static const struct dev_pm_ops rcar_pcie_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(NULL, rcar_pcie_resume)
- .resume_noirq = rcar_pcie_resume_noirq,
-};
-
-static struct platform_driver rcar_pcie_driver = {
- .driver = {
- .name = "rcar-pcie",
- .of_match_table = rcar_pcie_of_match,
- .pm = &rcar_pcie_pm_ops,
- .suppress_bind_attrs = true,
- },
- .probe = rcar_pcie_probe,
-};
-builtin_platform_driver(rcar_pcie_driver);
projects / mirror_ubuntu-jammy-kernel.git / commitdiff