Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
new file mode 100644
index 0000000..2bee09b
--- /dev/null
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -0,0 +1,1053 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe driver for Renesas R-Car SoCs
+ * Copyright (C) 2014-2020 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>
+
+#include "pcie-rcar.h"
+
+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_host {
+ struct rcar_pcie pcie;
+ struct device *dev;
+ struct phy *phy;
+ void __iomem *base;
+ struct clk *bus_clk;
+ struct rcar_msi msi;
+ int (*phy_init_fn)(struct rcar_pcie_host *host);
+};
+
+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_host *host,
+ unsigned char access_type, struct pci_bus *bus,
+ unsigned int devfn, int where, u32 *data)
+{
+ struct rcar_pcie *pcie = &host->pcie;
+ 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
+ rcar_pci_write_reg(pcie, *data, PCICONF(index));
+
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ /* 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 (pci_is_root_bus(bus->parent))
+ 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_host *host = bus->sysdata;
+ int ret;
+
+ ret = rcar_pcie_config_access(host, 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_host *host = bus->sysdata;
+ unsigned int shift;
+ u32 data;
+ int ret;
+
+ ret = rcar_pcie_config_access(host, 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(host, 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_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_host *host)
+{
+ struct rcar_pcie *pcie = &host->pcie;
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
+ struct resource_entry *win;
+ LIST_HEAD(res);
+ int i = 0;
+
+ /* Try setting 5 GT/s link speed */
+ rcar_pcie_force_speedup(pcie);
+
+ /* Setup PCI resources */
+ resource_list_for_each_entry(win, &bridge->windows) {
+ struct resource *res = win->res;
+
+ if (!res->flags)
+ continue;
+
+ switch (resource_type(res)) {
+ case IORESOURCE_IO:
+ case IORESOURCE_MEM:
+ rcar_pcie_set_outbound(pcie, i, win);
+ i++;
+ break;
+ }
+ }
+}
+
+static int rcar_pcie_enable(struct rcar_pcie_host *host)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
+
+ rcar_pcie_hw_enable(host);
+
+ pci_add_flags(PCI_REASSIGN_ALL_BUS);
+
+ bridge->sysdata = host;
+ bridge->ops = &rcar_pcie_ops;
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ bridge->msi = &host->msi.chip;
+
+ return pci_host_probe(bridge);
+}
+
+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_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_host *host)
+{
+ struct rcar_pcie *pcie = &host->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_host *host)
+{
+ struct rcar_pcie *pcie = &host->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_host *host)
+{
+ int err;
+
+ err = phy_init(host->phy);
+ if (err)
+ return err;
+
+ err = phy_power_on(host->phy);
+ if (err)
+ phy_exit(host->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_host *host = data;
+ struct rcar_pcie *pcie = &host->pcie;
+ struct rcar_msi *msi = &host->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_host *host = container_of(chip, struct rcar_pcie_host,
+ msi.chip);
+ struct rcar_pcie *pcie = &host->pcie;
+ 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_msi *msi = to_rcar_msi(chip);
+ struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host,
+ msi.chip);
+ struct rcar_pcie *pcie = &host->pcie;
+ 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_host *host)
+{
+ struct rcar_msi *msi = &host->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_host *host)
+{
+ struct rcar_pcie *pcie = &host->pcie;
+ struct rcar_msi *msi = &host->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_host *host)
+{
+ struct rcar_pcie *pcie = &host->pcie;
+ struct device *dev = pcie->dev;
+ struct rcar_msi *msi = &host->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, host);
+ 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, host);
+ 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 | GFP_DMA32, 0);
+ rcar_pcie_hw_enable_msi(host);
+
+ return 0;
+
+err:
+ rcar_pcie_unmap_msi(host);
+ return err;
+}
+
+static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host)
+{
+ struct rcar_pcie *pcie = &host->pcie;
+ struct rcar_msi *msi = &host->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(host);
+}
+
+static int rcar_pcie_get_resources(struct rcar_pcie_host *host)
+{
+ struct rcar_pcie *pcie = &host->pcie;
+ struct device *dev = pcie->dev;
+ struct resource res;
+ int err, i;
+
+ host->phy = devm_phy_optional_get(dev, "pcie");
+ if (IS_ERR(host->phy))
+ return PTR_ERR(host->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);
+
+ host->bus_clk = devm_clk_get(dev, "pcie_bus");
+ if (IS_ERR(host->bus_clk)) {
+ dev_err(dev, "cannot get pcie bus clock\n");
+ return PTR_ERR(host->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;
+ }
+ host->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;
+ }
+ host->msi.irq2 = i;
+
+ return 0;
+
+err_irq2:
+ irq_dispose_mapping(host->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;
+
+ rcar_pcie_set_inbound(pcie, cpu_addr, pci_addr,
+ lower_32_bits(mask) | flags, idx, true);
+
+ pci_addr += size;
+ cpu_addr += size;
+ idx += 2;
+ }
+ *index = idx;
+
+ return 0;
+}
+
+static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie_host *host)
+{
+ struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
+ struct resource_entry *entry;
+ int index = 0, err = 0;
+
+ resource_list_for_each_entry(entry, &bridge->dma_ranges) {
+ err = rcar_pcie_inbound_ranges(&host->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_host *host;
+ struct rcar_pcie *pcie;
+ u32 data;
+ int err;
+ struct pci_host_bridge *bridge;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*host));
+ if (!bridge)
+ return -ENOMEM;
+
+ host = pci_host_bridge_priv(bridge);
+ pcie = &host->pcie;
+ pcie->dev = dev;
+ platform_set_drvdata(pdev, host);
+
+ 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_put;
+ }
+
+ err = rcar_pcie_get_resources(host);
+ if (err < 0) {
+ dev_err(dev, "failed to request resources: %d\n", err);
+ goto err_pm_put;
+ }
+
+ err = clk_prepare_enable(host->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(host);
+ if (err)
+ goto err_clk_disable;
+
+ host->phy_init_fn = of_device_get_match_data(dev);
+ err = host->phy_init_fn(host);
+ 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(host);
+ if (err < 0) {
+ dev_err(dev,
+ "failed to enable MSI support: %d\n",
+ err);
+ goto err_phy_shutdown;
+ }
+ }
+
+ err = rcar_pcie_enable(host);
+ if (err)
+ goto err_msi_teardown;
+
+ return 0;
+
+err_msi_teardown:
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ rcar_pcie_teardown_msi(host);
+
+err_phy_shutdown:
+ if (host->phy) {
+ phy_power_off(host->phy);
+ phy_exit(host->phy);
+ }
+
+err_clk_disable:
+ clk_disable_unprepare(host->bus_clk);
+
+err_unmap_msi_irqs:
+ irq_dispose_mapping(host->msi.irq2);
+ irq_dispose_mapping(host->msi.irq1);
+
+err_pm_put:
+ pm_runtime_put(dev);
+ pm_runtime_disable(dev);
+
+ return err;
+}
+
+static int __maybe_unused rcar_pcie_resume(struct device *dev)
+{
+ struct rcar_pcie_host *host = dev_get_drvdata(dev);
+ struct rcar_pcie *pcie = &host->pcie;
+ unsigned int data;
+ int err;
+
+ err = rcar_pcie_parse_map_dma_ranges(host);
+ if (err)
+ return 0;
+
+ /* Failure to get a link might just be that no cards are inserted */
+ err = host->phy_init_fn(host);
+ 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(host);
+
+ rcar_pcie_hw_enable(host);
+
+ return 0;
+}
+
+static int rcar_pcie_resume_noirq(struct device *dev)
+{
+ struct rcar_pcie_host *host = dev_get_drvdata(dev);
+ struct rcar_pcie *pcie = &host->pcie;
+
+ 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);