diff options
Diffstat (limited to 'drivers/pci/controller/pcie-rcar.c')
| -rw-r--r-- | drivers/pci/controller/pcie-rcar.c | 1211 |
1 files changed, 41 insertions, 1170 deletions
diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c index 759c6542c5c8..7583699ef7b6 100644 --- a/drivers/pci/controller/pcie-rcar.c +++ b/drivers/pci/controller/pcie-rcar.c @@ -1,177 +1,27 @@ // 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 + * Copyright (C) 2014-2020 Renesas Electronics Europe Ltd * * 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) +#include "pcie-rcar.h" -#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; -}; - -static void rcar_pci_write_reg(struct rcar_pcie *pcie, u32 val, - unsigned int reg) +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) +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) +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); @@ -181,163 +31,42 @@ static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data) rcar_pci_write_reg(pcie, val, where & ~3); } -static u32 rcar_read_conf(struct rcar_pcie *pcie, int where) +int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie) { - 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; -} + unsigned int timeout = 10; -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; + while (timeout--) { + if (rcar_pci_read_reg(pcie, PCIEPHYSR) & PHYRDY) + return 0; - ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ, - bus, devfn, where, val); - if (ret != PCIBIOS_SUCCESSFUL) { - *val = 0xffffffff; - return ret; + msleep(5); } - 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; + return -ETIMEDOUT; } -/* 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) +int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie) { - 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); + unsigned int timeout = 10000; - 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; + while (timeout--) { + if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE)) + return 0; - ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_WRITE, - bus, devfn, where, &data); + udelay(5); + cpu_relax(); + } - return ret; + return -ETIMEDOUT; } -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) +void rcar_pcie_set_outbound(struct rcar_pcie *pcie, int win, + struct resource_entry *window) { /* Setup PCIe address space mappings for each resource */ - resource_size_t size; + struct resource *res = window->res; resource_size_t res_start; + resource_size_t size; u32 mask; rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win)); @@ -347,13 +76,16 @@ static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie, * keeps things pretty simple. */ size = resource_size(res); - mask = (roundup_pow_of_two(size) / SZ_128) - 1; + if (size > 128) + mask = (roundup_pow_of_two(size) / SZ_128) - 1; + else + mask = 0x0; rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win)); if (res->flags & IORESOURCE_IO) - res_start = pci_pio_to_address(res->start); + res_start = pci_pio_to_address(res->start) - window->offset; else - res_start = res->start; + 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, @@ -367,883 +99,22 @@ static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie, 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 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 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) +void rcar_pcie_set_inbound(struct rcar_pcie *pcie, u64 cpu_addr, + u64 pci_addr, u64 flags, int idx, bool host) { /* - * These settings come from the R-Car Series, 2nd Generation User's - * Manual, section 50.3.1 (2) Initialization of the physical layer. + * Set up 64-bit inbound regions as the range parser doesn't + * distinguish between 32 and 64-bit types. */ - 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 int rcar_pcie_enable_msi(struct rcar_pcie *pcie) -{ - struct device *dev = pcie->dev; - struct rcar_msi *msi = &pcie->msi; - phys_addr_t base; - 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); - if (!msi->pages) { - err = -ENOMEM; - goto err; - } - 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); - - 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. - */ + if (host) 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, lower_32_bits(cpu_addr), PCIELAR(idx)); + rcar_pci_write_reg(pcie, flags, PCIELAMR(idx)); + if (host) 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; - int (*phy_init_fn)(struct rcar_pcie *); - 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; - - phy_init_fn = of_device_get_match_data(dev); - err = 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; + rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx + 1)); + rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1)); } - -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 = { - .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); |