| /* |
| * 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> |
| * |
| * 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/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/platform_device.h> |
| #include <linux/pm_runtime.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 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 (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 |
| |
| /* 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; |
| void __iomem *base; |
| struct list_head resources; |
| int root_bus_nr; |
| struct clk *clk; |
| struct clk *bus_clk; |
| struct rcar_msi msi; |
| }; |
| |
| static void rcar_pci_write_reg(struct rcar_pcie *pcie, unsigned long val, |
| unsigned long reg) |
| { |
| writel(val, pcie->base + reg); |
| } |
| |
| static unsigned long rcar_pci_read_reg(struct rcar_pcie *pcie, |
| unsigned long 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) |
| { |
| int shift = 8 * (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) |
| { |
| int shift = 8 * (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) |
| { |
| 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 >> (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 = bus->sysdata; |
| int shift, ret; |
| u32 data; |
| |
| 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%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, 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 *res) |
| { |
| /* Setup PCIe address space mappings for each resource */ |
| resource_size_t size; |
| resource_size_t res_start; |
| 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); |
| else |
| res_start = res->start; |
| |
| 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, res); |
| i++; |
| break; |
| case IORESOURCE_BUS: |
| pci->root_bus_nr = res->start; |
| break; |
| default: |
| continue; |
| } |
| |
| pci_add_resource(resource, res); |
| } |
| |
| return 1; |
| } |
| |
| static int rcar_pcie_enable(struct rcar_pcie *pcie) |
| { |
| struct pci_bus *bus, *child; |
| LIST_HEAD(res); |
| |
| rcar_pcie_setup(&res, pcie); |
| |
| pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS); |
| |
| if (IS_ENABLED(CONFIG_PCI_MSI)) |
| bus = pci_scan_root_bus_msi(pcie->dev, pcie->root_bus_nr, |
| &rcar_pcie_ops, pcie, &res, &pcie->msi.chip); |
| else |
| bus = pci_scan_root_bus(pcie->dev, pcie->root_bus_nr, |
| &rcar_pcie_ops, pcie, &res); |
| |
| if (!bus) { |
| dev_err(pcie->dev, "Scanning rootbus failed"); |
| return -ENODEV; |
| } |
| |
| pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); |
| |
| 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) |
| { |
| unsigned int timeout = 100; |
| |
| while (timeout--) { |
| if (rcar_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 */ |
| 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_dl(struct rcar_pcie *pcie) |
| { |
| unsigned int timeout = 10; |
| |
| while (timeout--) { |
| if ((rcar_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 */ |
| rcar_pci_write_reg(pcie, 0, PCIETCTLR); |
| |
| /* Set mode */ |
| rcar_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. |
| */ |
| 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); |
| |
| /* 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_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 (rcar_pci_read_reg(pcie, H1_PCIEPHYSR)) |
| return rcar_pcie_hw_init(pcie); |
| |
| msleep(5); |
| } |
| |
| return -ETIMEDOUT; |
| } |
| |
| static int rcar_pcie_hw_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 rcar_pcie_hw_init(pcie); |
| } |
| |
| 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 = 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 irq; |
| |
| /* clear the interrupt */ |
| rcar_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 = 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_create_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 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 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 | IRQF_NO_THREAD, |
| 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 | IRQF_NO_THREAD, |
| 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); |
| |
| rcar_pci_write_reg(pcie, base | MSIFE, PCIEMSIALR); |
| rcar_pci_write_reg(pcie, 0, PCIEMSIAUR); |
| |
| /* enable all MSI interrupts */ |
| rcar_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) { |
| 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) { |
| 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. |
| */ |
| 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; |
| |
| 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-rcar-gen2", .data = rcar_pcie_hw_init_gen2 }, |
| { .compatible = "renesas,pcie-r8a7790", .data = rcar_pcie_hw_init_gen2 }, |
| { .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init_gen2 }, |
| { .compatible = "renesas,pcie-r8a7795", .data = rcar_pcie_hw_init }, |
| {}, |
| }; |
| |
| static void rcar_pcie_release_of_pci_ranges(struct rcar_pcie *pci) |
| { |
| pci_free_resource_list(&pci->resources); |
| } |
| |
| static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci) |
| { |
| int err; |
| struct device *dev = pci->dev; |
| struct device_node *np = dev->of_node; |
| resource_size_t iobase; |
| struct resource_entry *win; |
| |
| err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources, &iobase); |
| if (err) |
| return err; |
| |
| resource_list_for_each_entry(win, &pci->resources) { |
| struct resource *parent, *res = win->res; |
| |
| switch (resource_type(res)) { |
| case IORESOURCE_IO: |
| parent = &ioport_resource; |
| err = pci_remap_iospace(res, iobase); |
| if (err) { |
| dev_warn(dev, "error %d: failed to map resource %pR\n", |
| err, res); |
| continue; |
| } |
| break; |
| case IORESOURCE_MEM: |
| parent = &iomem_resource; |
| break; |
| |
| case IORESOURCE_BUS: |
| default: |
| continue; |
| } |
| |
| err = devm_request_resource(dev, parent, res); |
| if (err) |
| goto out_release_res; |
| } |
| |
| return 0; |
| |
| out_release_res: |
| rcar_pcie_release_of_pci_ranges(pci); |
| return err; |
| } |
| |
| static int rcar_pcie_probe(struct platform_device *pdev) |
| { |
| struct rcar_pcie *pcie; |
| unsigned int data; |
| const struct of_device_id *of_id; |
| int err; |
| 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); |
| |
| INIT_LIST_HEAD(&pcie->resources); |
| |
| rcar_pcie_parse_request_of_pci_ranges(pcie); |
| |
| err = rcar_pcie_get_resources(pdev, pcie); |
| if (err < 0) { |
| dev_err(&pdev->dev, "failed to request resources: %d\n", err); |
| return err; |
| } |
| |
| err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node); |
| if (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; |
| |
| 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; |
| } |
| |
| /* 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"); |
| err = 0; |
| goto err_pm_put; |
| } |
| |
| data = rcar_pci_read_reg(pcie, MACSR); |
| dev_info(&pdev->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(&pdev->dev, |
| "failed to enable MSI support: %d\n", |
| err); |
| goto err_pm_put; |
| } |
| } |
| |
| err = rcar_pcie_enable(pcie); |
| if (err) |
| goto err_pm_put; |
| |
| return 0; |
| |
| err_pm_put: |
| pm_runtime_put(pcie->dev); |
| |
| err_pm_disable: |
| pm_runtime_disable(pcie->dev); |
| return err; |
| } |
| |
| static struct platform_driver rcar_pcie_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| .of_match_table = rcar_pcie_of_match, |
| .suppress_bind_attrs = true, |
| }, |
| .probe = rcar_pcie_probe, |
| }; |
| builtin_platform_driver(rcar_pcie_driver); |