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path: root/drivers/pci/host/pcie-rcar.c
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Diffstat (limited to 'drivers/pci/host/pcie-rcar.c')
-rw-r--r--drivers/pci/host/pcie-rcar.c1006
1 files changed, 1006 insertions, 0 deletions
diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
new file mode 100644
index 00000000000..f7d3de32c9a
--- /dev/null
+++ b/drivers/pci/host/pcie-rcar.c
@@ -0,0 +1,1006 @@
+/*
+ * 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
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#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/module.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/platform_device.h>
+#include <linux/slab.h>
+
+#define DRV_NAME "rcar-pcie"
+
+#define PCIECAR 0x000010
+#define PCIECCTLR 0x000018
+#define CONFIG_SEND_ENABLE (1 << 31)
+#define TYPE0 (0 << 8)
+#define TYPE1 (1 << 8)
+#define PCIECDR 0x000020
+#define PCIEMSR 0x000028
+#define PCIEINTXR 0x000400
+#define PCIEMSITXR 0x000840
+
+/* Transfer control */
+#define PCIETCTLR 0x02000
+#define CFINIT 1
+#define PCIETSTR 0x02004
+#define DATA_LINK_ACTIVE 1
+#define PCIEERRFR 0x02020
+#define UNSUPPORTED_REQUEST (1 << 4)
+#define PCIEMSIFR 0x02044
+#define PCIEMSIALR 0x02048
+#define MSIFE 1
+#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 (1 << 3)
+#define LAM_64BIT (1 << 2)
+#define LAR_ENABLE (1 << 1)
+
+/* PCIe address reg & mask */
+#define PCIEPARL(x) (0x03400 + ((x) * 0x20))
+#define PCIEPARH(x) (0x03404 + ((x) * 0x20))
+#define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
+#define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
+#define PAR_ENABLE (1 << 31)
+#define IO_SPACE (1 << 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 MACCTLR 0x011058
+#define SCRAMBLE_DISABLE (1 << 27)
+
+/* R-Car H1 PHY */
+#define H1_PCIEPHYADRR 0x04000c
+#define WRITE_CMD (1 << 16)
+#define PHY_ACK (1 << 24)
+#define RATE_POS 12
+#define LANE_POS 8
+#define ADR_POS 0
+#define H1_PCIEPHYDOUTR 0x040014
+#define H1_PCIEPHYSR 0x040018
+
+#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 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_chip chip;
+ unsigned long pages;
+ struct mutex lock;
+ int irq1;
+ int irq2;
+};
+
+static inline struct rcar_msi *to_rcar_msi(struct msi_chip *chip)
+{
+ return container_of(chip, struct rcar_msi, chip);
+}
+
+/* Structure representing the PCIe interface */
+struct rcar_pcie {
+ struct device *dev;
+ void __iomem *base;
+ struct resource res[PCI_MAX_RESOURCES];
+ struct resource busn;
+ int root_bus_nr;
+ struct clk *clk;
+ struct clk *bus_clk;
+ struct rcar_msi msi;
+};
+
+static inline struct rcar_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+ return sys->private_data;
+}
+
+static void pci_write_reg(struct rcar_pcie *pcie, unsigned long val,
+ unsigned long reg)
+{
+ writel(val, pcie->base + reg);
+}
+
+static unsigned long pci_read_reg(struct rcar_pcie *pcie, unsigned long reg)
+{
+ return readl(pcie->base + reg);
+}
+
+enum {
+ PCI_ACCESS_READ,
+ PCI_ACCESS_WRITE,
+};
+
+static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
+{
+ int shift = 8 * (where & 3);
+ u32 val = pci_read_reg(pcie, where & ~3);
+
+ val &= ~(mask << shift);
+ val |= data << shift;
+ pci_write_reg(pcie, val, where & ~3);
+}
+
+static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
+{
+ int shift = 8 * (where & 3);
+ u32 val = 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)
+{
+ 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 == PCI_ACCESS_READ) {
+ *data = 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;
+
+ pci_write_reg(pcie, *data, PCICONF(index));
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+ }
+
+ if (pcie->root_bus_nr < 0)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+
+ /* Clear errors */
+ pci_write_reg(pcie, pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
+
+ /* Set the PIO address */
+ 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)
+ pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
+ else
+ pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);
+
+ /* Check for errors */
+ if (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 == PCI_ACCESS_READ)
+ *data = pci_read_reg(pcie, PCIECDR);
+ else
+ pci_write_reg(pcie, *data, PCIECDR);
+
+ /* Disable the configuration access */
+ 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 = sys_to_pcie(bus->sysdata);
+ int ret;
+
+ if ((size == 2) && (where & 1))
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+ else if ((size == 4) && (where & 3))
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ ret = rcar_pcie_config_access(pcie, PCI_ACCESS_READ,
+ bus, devfn, where, val);
+ if (ret != PCIBIOS_SUCCESSFUL) {
+ *val = 0xffffffff;
+ return ret;
+ }
+
+ if (size == 1)
+ *val = (*val >> (8 * (where & 3))) & 0xff;
+ else if (size == 2)
+ *val = (*val >> (8 * (where & 2))) & 0xffff;
+
+ dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
+ bus->number, devfn, where, size, (unsigned long)*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 = sys_to_pcie(bus->sysdata);
+ int shift, ret;
+ u32 data;
+
+ if ((size == 2) && (where & 1))
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+ else if ((size == 4) && (where & 3))
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+
+ ret = rcar_pcie_config_access(pcie, 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%08lx\n",
+ bus->number, devfn, where, size, (unsigned long)val);
+
+ if (size == 1) {
+ shift = 8 * (where & 3);
+ data &= ~(0xff << shift);
+ data |= ((val & 0xff) << shift);
+ } else if (size == 2) {
+ shift = 8 * (where & 2);
+ data &= ~(0xffff << shift);
+ data |= ((val & 0xffff) << shift);
+ } else
+ data = val;
+
+ ret = rcar_pcie_config_access(pcie, 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 resource *res,
+ struct rcar_pcie *pcie)
+{
+ /* Setup PCIe address space mappings for each resource */
+ resource_size_t size;
+ u32 mask;
+
+ 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;
+ pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
+
+ pci_write_reg(pcie, upper_32_bits(res->start), PCIEPARH(win));
+ pci_write_reg(pcie, lower_32_bits(res->start), PCIEPARL(win));
+
+ /* First resource is for IO */
+ mask = PAR_ENABLE;
+ if (res->flags & IORESOURCE_IO)
+ mask |= IO_SPACE;
+
+ pci_write_reg(pcie, mask, PCIEPTCTLR(win));
+}
+
+static int rcar_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+ struct rcar_pcie *pcie = sys_to_pcie(sys);
+ struct resource *res;
+ int i;
+
+ pcie->root_bus_nr = -1;
+
+ /* Setup PCI resources */
+ for (i = 0; i < PCI_MAX_RESOURCES; i++) {
+
+ res = &pcie->res[i];
+ if (!res->flags)
+ continue;
+
+ rcar_pcie_setup_window(i, res, pcie);
+
+ if (res->flags & IORESOURCE_IO)
+ pci_ioremap_io(nr * SZ_64K, res->start);
+ else
+ pci_add_resource(&sys->resources, res);
+ }
+ pci_add_resource(&sys->resources, &pcie->busn);
+
+ return 1;
+}
+
+static void rcar_pcie_add_bus(struct pci_bus *bus)
+{
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ struct rcar_pcie *pcie = sys_to_pcie(bus->sysdata);
+
+ bus->msi = &pcie->msi.chip;
+ }
+}
+
+struct hw_pci rcar_pci = {
+ .setup = rcar_pcie_setup,
+ .map_irq = of_irq_parse_and_map_pci,
+ .ops = &rcar_pcie_ops,
+ .add_bus = rcar_pcie_add_bus,
+};
+
+static void rcar_pcie_enable(struct rcar_pcie *pcie)
+{
+ struct platform_device *pdev = to_platform_device(pcie->dev);
+
+ rcar_pci.nr_controllers = 1;
+ rcar_pci.private_data = (void **)&pcie;
+
+ pci_common_init_dev(&pdev->dev, &rcar_pci);
+#ifdef CONFIG_PCI_DOMAINS
+ rcar_pci.domain++;
+#endif
+}
+
+static int phy_wait_for_ack(struct rcar_pcie *pcie)
+{
+ unsigned int timeout = 100;
+
+ while (timeout--) {
+ if (pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
+ return 0;
+
+ udelay(100);
+ }
+
+ dev_err(pcie->dev, "Access to PCIe phy timed out\n");
+
+ return -ETIMEDOUT;
+}
+
+static void phy_write_reg(struct rcar_pcie *pcie,
+ unsigned int rate, unsigned int addr,
+ unsigned int lane, unsigned int data)
+{
+ unsigned long phyaddr;
+
+ phyaddr = WRITE_CMD |
+ ((rate & 1) << RATE_POS) |
+ ((lane & 0xf) << LANE_POS) |
+ ((addr & 0xff) << ADR_POS);
+
+ /* Set write data */
+ pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
+ 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 */
+ pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
+ 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_dl(struct rcar_pcie *pcie)
+{
+ unsigned int timeout = 10;
+
+ while (timeout--) {
+ if ((pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
+ return 0;
+
+ msleep(5);
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
+{
+ int err;
+
+ /* Begin initialization */
+ pci_write_reg(pcie, 0, PCIETCTLR);
+
+ /* Set mode */
+ pci_write_reg(pcie, 1, PCIEMSR);
+
+ /*
+ * 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.
+ */
+ 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), 0, 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), 0, 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), 0xfff0, 0);
+
+ /* Enable MAC data scrambling. */
+ rcar_rmw32(pcie, MACCTLR, SCRAMBLE_DISABLE, 0);
+
+ /* Enable MSI */
+ if (IS_ENABLED(CONFIG_PCI_MSI))
+ pci_write_reg(pcie, 0x101f0000, PCIEMSITXR);
+
+ /* Finish initialization - establish a PCI Express link */
+ 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);
+
+ /* Enable slave Bus Mastering */
+ rcar_rmw32(pcie, RCONF(PCI_STATUS), PCI_STATUS_DEVSEL_MASK,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST);
+
+ wmb();
+
+ return 0;
+}
+
+static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie)
+{
+ unsigned int timeout = 10;
+
+ /* 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);
+
+ while (timeout--) {
+ if (pci_read_reg(pcie, H1_PCIEPHYSR))
+ return rcar_pcie_hw_init(pcie);
+
+ msleep(5);
+ }
+
+ return -ETIMEDOUT;
+}
+
+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 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;
+ unsigned long reg;
+
+ reg = 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(&reg, 32);
+ unsigned int irq;
+
+ /* clear the interrupt */
+ pci_write_reg(pcie, 1 << index, PCIEMSIFR);
+
+ irq = irq_find_mapping(msi->domain, index);
+ if (irq) {
+ if (test_bit(index, msi->used))
+ generic_handle_irq(irq);
+ else
+ dev_info(pcie->dev, "unhandled MSI\n");
+ } else {
+ /* Unknown MSI, just clear it */
+ dev_dbg(pcie->dev, "unexpected MSI\n");
+ }
+
+ /* see if there's any more pending in this vector */
+ reg = pci_read_reg(pcie, PCIEMSIFR);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int rcar_msi_setup_irq(struct msi_chip *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_create_mapping(msi->domain, hwirq);
+ if (!irq) {
+ rcar_msi_free(msi, hwirq);
+ return -EINVAL;
+ }
+
+ irq_set_msi_desc(irq, desc);
+
+ msg.address_lo = pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
+ msg.address_hi = pci_read_reg(pcie, PCIEMSIAUR);
+ msg.data = hwirq;
+
+ write_msi_msg(irq, &msg);
+
+ return 0;
+}
+
+static void rcar_msi_teardown_irq(struct msi_chip *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 = unmask_msi_irq,
+ .irq_disable = mask_msi_irq,
+ .irq_mask = mask_msi_irq,
+ .irq_unmask = unmask_msi_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);
+ set_irq_flags(irq, IRQF_VALID);
+
+ return 0;
+}
+
+static const struct irq_domain_ops msi_domain_ops = {
+ .map = rcar_msi_map,
+};
+
+static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
+{
+ struct platform_device *pdev = to_platform_device(pcie->dev);
+ struct rcar_msi *msi = &pcie->msi;
+ unsigned long base;
+ int err;
+
+ mutex_init(&msi->lock);
+
+ msi->chip.dev = pcie->dev;
+ msi->chip.setup_irq = rcar_msi_setup_irq;
+ msi->chip.teardown_irq = rcar_msi_teardown_irq;
+
+ msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
+ &msi_domain_ops, &msi->chip);
+ if (!msi->domain) {
+ dev_err(&pdev->dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ /* Two irqs are for MSI, but they are also used for non-MSI irqs */
+ err = devm_request_irq(&pdev->dev, msi->irq1, rcar_pcie_msi_irq,
+ IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
+ goto err;
+ }
+
+ err = devm_request_irq(&pdev->dev, msi->irq2, rcar_pcie_msi_irq,
+ IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
+ goto err;
+ }
+
+ /* setup MSI data target */
+ msi->pages = __get_free_pages(GFP_KERNEL, 0);
+ base = virt_to_phys((void *)msi->pages);
+
+ pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
+ pci_write_reg(pcie, 0, PCIEMSIAUR);
+
+ /* enable all MSI interrupts */
+ pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
+
+ return 0;
+
+err:
+ irq_domain_remove(msi->domain);
+ return err;
+}
+
+static int rcar_pcie_get_resources(struct platform_device *pdev,
+ struct rcar_pcie *pcie)
+{
+ struct resource res;
+ int err, i;
+
+ err = of_address_to_resource(pdev->dev.of_node, 0, &res);
+ if (err)
+ return err;
+
+ pcie->clk = devm_clk_get(&pdev->dev, "pcie");
+ if (IS_ERR(pcie->clk)) {
+ dev_err(pcie->dev, "cannot get platform clock\n");
+ return PTR_ERR(pcie->clk);
+ }
+ err = clk_prepare_enable(pcie->clk);
+ if (err)
+ goto fail_clk;
+
+ pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
+ if (IS_ERR(pcie->bus_clk)) {
+ dev_err(pcie->dev, "cannot get pcie bus clock\n");
+ err = PTR_ERR(pcie->bus_clk);
+ goto fail_clk;
+ }
+ err = clk_prepare_enable(pcie->bus_clk);
+ if (err)
+ goto err_map_reg;
+
+ i = irq_of_parse_and_map(pdev->dev.of_node, 0);
+ if (i < 0) {
+ dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
+ err = -ENOENT;
+ goto err_map_reg;
+ }
+ pcie->msi.irq1 = i;
+
+ i = irq_of_parse_and_map(pdev->dev.of_node, 1);
+ if (i < 0) {
+ dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
+ err = -ENOENT;
+ goto err_map_reg;
+ }
+ pcie->msi.irq2 = i;
+
+ pcie->base = devm_ioremap_resource(&pdev->dev, &res);
+ if (IS_ERR(pcie->base)) {
+ err = PTR_ERR(pcie->base);
+ goto err_map_reg;
+ }
+
+ return 0;
+
+err_map_reg:
+ clk_disable_unprepare(pcie->bus_clk);
+fail_clk:
+ clk_disable_unprepare(pcie->clk);
+
+ return err;
+}
+
+static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
+ struct of_pci_range *range,
+ int *index)
+{
+ u64 restype = range->flags;
+ u64 cpu_addr = range->cpu_addr;
+ u64 cpu_end = range->cpu_addr + range->size;
+ u64 pci_addr = range->pci_addr;
+ u32 flags = LAM_64BIT | LAR_ENABLE;
+ u64 mask;
+ u64 size;
+ int idx = *index;
+
+ if (restype & IORESOURCE_PREFETCH)
+ flags |= LAM_PREFETCH;
+
+ /*
+ * 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(range->size, alignment);
+ } else {
+ size = range->size;
+ }
+ /* Hardware supports max 4GiB inbound region */
+ size = min(size, 1ULL << 32);
+
+ mask = roundup_pow_of_two(size) - 1;
+ mask &= ~0xf;
+
+ while (cpu_addr < cpu_end) {
+ /*
+ * Set up 64-bit inbound regions as the range parser doesn't
+ * distinguish between 32 and 64-bit types.
+ */
+ pci_write_reg(pcie, lower_32_bits(pci_addr), PCIEPRAR(idx));
+ pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
+ pci_write_reg(pcie, lower_32_bits(mask) | flags, PCIELAMR(idx));
+
+ pci_write_reg(pcie, upper_32_bits(pci_addr), PCIEPRAR(idx+1));
+ pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx+1));
+ pci_write_reg(pcie, 0, PCIELAMR(idx+1));
+
+ pci_addr += size;
+ cpu_addr += size;
+ idx += 2;
+
+ if (idx > MAX_NR_INBOUND_MAPS) {
+ dev_err(pcie->dev, "Failed to map inbound regions!\n");
+ return -EINVAL;
+ }
+ }
+ *index = idx;
+
+ return 0;
+}
+
+static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
+ struct device_node *node)
+{
+ const int na = 3, ns = 2;
+ int rlen;
+
+ parser->node = node;
+ parser->pna = of_n_addr_cells(node);
+ parser->np = parser->pna + na + ns;
+
+ parser->range = of_get_property(node, "dma-ranges", &rlen);
+ if (!parser->range)
+ return -ENOENT;
+
+ parser->end = parser->range + rlen / sizeof(__be32);
+ return 0;
+}
+
+static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie,
+ struct device_node *np)
+{
+ struct of_pci_range range;
+ struct of_pci_range_parser parser;
+ int index = 0;
+ int err;
+
+ if (pci_dma_range_parser_init(&parser, np))
+ return -EINVAL;
+
+ /* Get the dma-ranges from DT */
+ for_each_of_pci_range(&parser, &range) {
+ u64 end = range.cpu_addr + range.size - 1;
+ dev_dbg(pcie->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
+ range.flags, range.cpu_addr, end, range.pci_addr);
+
+ err = rcar_pcie_inbound_ranges(pcie, &range, &index);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id rcar_pcie_of_match[] = {
+ { .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 },
+ { .compatible = "renesas,pcie-r8a7790", .data = rcar_pcie_hw_init },
+ { .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rcar_pcie_of_match);
+
+static int rcar_pcie_probe(struct platform_device *pdev)
+{
+ struct rcar_pcie *pcie;
+ unsigned int data;
+ struct of_pci_range range;
+ struct of_pci_range_parser parser;
+ const struct of_device_id *of_id;
+ int err, win = 0;
+ int (*hw_init_fn)(struct rcar_pcie *);
+
+ pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
+ if (!pcie)
+ return -ENOMEM;
+
+ pcie->dev = &pdev->dev;
+ platform_set_drvdata(pdev, pcie);
+
+ /* Get the bus range */
+ if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
+ dev_err(&pdev->dev, "failed to parse bus-range property\n");
+ return -EINVAL;
+ }
+
+ if (of_pci_range_parser_init(&parser, pdev->dev.of_node)) {
+ dev_err(&pdev->dev, "missing ranges property\n");
+ return -EINVAL;
+ }
+
+ err = rcar_pcie_get_resources(pdev, pcie);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to request resources: %d\n", err);
+ return err;
+ }
+
+ for_each_of_pci_range(&parser, &range) {
+ of_pci_range_to_resource(&range, pdev->dev.of_node,
+ &pcie->res[win++]);
+
+ if (win > PCI_MAX_RESOURCES)
+ break;
+ }
+
+ err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node);
+ if (err)
+ return err;
+
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ err = rcar_pcie_enable_msi(pcie);
+ if (err < 0) {
+ dev_err(&pdev->dev,
+ "failed to enable MSI support: %d\n",
+ err);
+ return err;
+ }
+ }
+
+ of_id = of_match_device(rcar_pcie_of_match, pcie->dev);
+ if (!of_id || !of_id->data)
+ return -EINVAL;
+ hw_init_fn = of_id->data;
+
+ /* Failure to get a link might just be that no cards are inserted */
+ err = hw_init_fn(pcie);
+ if (err) {
+ dev_info(&pdev->dev, "PCIe link down\n");
+ return 0;
+ }
+
+ data = pci_read_reg(pcie, MACSR);
+ dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
+
+ rcar_pcie_enable(pcie);
+
+ return 0;
+}
+
+static struct platform_driver rcar_pcie_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = rcar_pcie_of_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = rcar_pcie_probe,
+};
+module_platform_driver(rcar_pcie_driver);
+
+MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
+MODULE_DESCRIPTION("Renesas R-Car PCIe driver");
+MODULE_LICENSE("GPLv2");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 01:30:11 +0000