Add driver for the Renesas RCar PCIe controller present on Gen3 SoCs. The PCIe on Gen3 is used both to connect external PCIe peripherals.
Signed-off-by: Marek Vasut marek.vasut+renesas@gmail.com Cc: Bin Meng bmeng.cn@gmail.com Cc: Nobuhiro Iwamatsu iwamatsu@nigauri.org --- drivers/pci/Kconfig | 8 + drivers/pci/Makefile | 1 + drivers/pci/pcie-rcar-gen3.c | 411 +++++++++++++++++++++++++++++++++++ 3 files changed, 420 insertions(+) create mode 100644 drivers/pci/pcie-rcar-gen3.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 1521885bde..f8f8004429 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -69,6 +69,14 @@ config PCI_RCAR_GEN2 Renesas RCar Gen2 SoCs. The PCIe controller on RCar Gen2 is also used to access EHCI USB controller on the SoC.
+config PCIE_RCAR_GEN3 + bool "Renesas RCar Gen3 PCIe driver" + depends on DM_PCI + depends on RCAR_GEN3 + help + Say Y here if you want to enable PCIe controller support on + Renesas RCar Gen3 SoCs. + config PCI_SANDBOX bool "Sandbox PCI support" depends on SANDBOX && DM_PCI diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index 4923641895..f6dd769bba 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_PCIE_IMX) += pcie_imx.o obj-$(CONFIG_FTPCI100) += pci_ftpci100.o obj-$(CONFIG_PCI_MVEBU) += pci_mvebu.o obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o +obj-$(CONFIG_PCIE_RCAR_GEN3) += pcie-rcar-gen3.o obj-$(CONFIG_SH4_PCI) += pci_sh4.o obj-$(CONFIG_SH7751_PCI) +=pci_sh7751.o obj-$(CONFIG_SH7780_PCI) +=pci_sh7780.o diff --git a/drivers/pci/pcie-rcar-gen3.c b/drivers/pci/pcie-rcar-gen3.c new file mode 100644 index 0000000000..dcf455e135 --- /dev/null +++ b/drivers/pci/pcie-rcar-gen3.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Renesas RCar Gen3 PCIEC driver + * + * Copyright (C) 2018-2019 Marek Vasut marek.vasut@gmail.com + * + * Based on Linux PCIe driver for Renesas R-Car SoCs + * Copyright (C) 2014 Renesas Electronics Europe Ltd + * + * Based on: + * arch/sh/drivers/pci/pcie-sh7786.c + * arch/sh/drivers/pci/ops-sh7786.c + * Copyright (C) 2009 - 2011 Paul Mundt + * + * Author: Phil Edworthy phil.edworthy@renesas.com + */ + +#include <common.h> +#include <asm/io.h> +#include <clk.h> +#include <dm.h> +#include <errno.h> +#include <pci.h> +#include <wait_bit.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 CFINIT 1 +#define PCIETSTR 0x02004 +#define DATA_LINK_ACTIVE 1 +#define PCIEERRFR 0x02020 +#define UNSUPPORTED_REQUEST BIT(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 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 SPEED_CHANGE BIT(24) +#define SCRAMBLE_DISABLE BIT(27) +#define MACS2R 0x011078 +#define MACCGSPSETR 0x011084 +#define SPCNGRSN BIT(31) + +/* R-Car H1 PHY */ +#define H1_PCIEPHYADRR 0x04000c +#define WRITE_CMD BIT(16) +#define PHY_ACK BIT(24) +#define RATE_POS 12 +#define LANE_POS 8 +#define ADR_POS 0 +#define H1_PCIEPHYDOUTR 0x040014 + +/* R-Car Gen2 PHY */ +#define GEN2_PCIEPHYADDR 0x780 +#define GEN2_PCIEPHYDATA 0x784 +#define GEN2_PCIEPHYCTRL 0x78c + +#define INT_PCI_MSI_NR 32 + +#define RCONF(x) (PCICONF(0) + (x)) +#define RPMCAP(x) (PMCAP(0) + (x)) +#define REXPCAP(x) (EXPCAP(0) + (x)) +#define RVCCAP(x) (VCCAP(0) + (x)) + +#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24) +#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19) +#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16) + +#define RCAR_PCI_MAX_RESOURCES 4 +#define MAX_NR_INBOUND_MAPS 6 + +#define PCI_EXP_FLAGS 2 /* Capabilities register */ +#define PCI_EXP_FLAGS_TYPE 0x00f0 /* Device/Port type */ +#define PCI_EXP_TYPE_ROOT_PORT 0x4 /* Root Port */ +#define PCI_EXP_LNKCAP 12 /* Link Capabilities */ +#define PCI_EXP_LNKCAP_DLLLARC 0x00100000 /* Data Link Layer Link Active Reporting Capable */ +#define PCI_EXP_SLTCAP 20 /* Slot Capabilities */ +#define PCI_EXP_SLTCAP_PSN 0xfff80000 /* Physical Slot Number */ + +enum { + RCAR_PCI_ACCESS_READ, + RCAR_PCI_ACCESS_WRITE, +}; + +struct rcar_gen3_pcie_priv { + fdt_addr_t regs; +}; + +static void rcar_rmw32(struct udevice *dev, int where, u32 mask, u32 data) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + int shift = 8 * (where & 3); + + clrsetbits_le32(priv->regs + (where & ~3), + mask << shift, data << shift); +} + +static u32 rcar_read_conf(struct udevice *dev, int where) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + int shift = 8 * (where & 3); + + return readl(priv->regs + (where & ~3)) >> shift; +} + +static int rcar_pcie_config_access(struct udevice *udev, + unsigned char access_type, + pci_dev_t bdf, int where, ulong *data) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(udev); + u32 reg = where & ~3; + + /* Clear errors */ + clrbits_le32(priv->regs + PCIEERRFR, 0); + + /* Set the PIO address */ + writel((bdf << 8) | reg, priv->regs + PCIECAR); + + /* Enable the configuration access */ + if (!PCI_BUS(bdf)) + writel(CONFIG_SEND_ENABLE | TYPE0, priv->regs + PCIECCTLR); + else + writel(CONFIG_SEND_ENABLE | TYPE1, priv->regs + PCIECCTLR); + + /* Check for errors */ + if (readl(priv->regs + PCIEERRFR) & UNSUPPORTED_REQUEST) + return -ENODEV; + + /* Check for master and target aborts */ + if (rcar_read_conf(udev, RCONF(PCI_STATUS)) & + (PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT)) + return -ENODEV; + + if (access_type == RCAR_PCI_ACCESS_READ) + *data = readl(priv->regs + PCIECDR); + else + writel(*data, priv->regs + PCIECDR); + + /* Disable the configuration access */ + writel(0, priv->regs + PCIECCTLR); + + return 0; +} + +static int rcar_gen3_pcie_addr_valid(pci_dev_t d, uint where) +{ + u32 slot; + + if (PCI_FUNC(d)) + return -EINVAL; + + slot = PCI_DEV(d); + if (slot != 1) + return -EINVAL; + + return 0; +} + +static int rcar_gen3_pcie_read_config(struct udevice *dev, pci_dev_t bdf, + uint where, ulong *val, + enum pci_size_t size) +{ + ulong reg; + int ret; + + ret = rcar_gen3_pcie_addr_valid(bdf, where); + if (ret) { + *val = pci_get_ff(size); + return 0; + } + + ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_READ, + bdf, where, ®); + if (ret != 0) + reg = 0xffffffffUL; + + *val = pci_conv_32_to_size(reg, where, size); + + return ret; +} + +static int rcar_gen3_pcie_write_config(struct udevice *dev, pci_dev_t bdf, + uint where, ulong val, + enum pci_size_t size) +{ + ulong data; + int ret; + + ret = rcar_gen3_pcie_addr_valid(bdf, where); + if (ret) + return ret; + + data = pci_conv_32_to_size(val, where, size); + + ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_WRITE, + bdf, where, &data); + + return ret; +} + +static int rcar_gen3_pcie_wait_for_phyrdy(struct udevice *dev) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + + return wait_for_bit_le32((void *)priv->regs + PCIEPHYSR, PHYRDY, + true, 50, false); +} + +static int rcar_gen3_pcie_wait_for_dl(struct udevice *dev) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + + return wait_for_bit_le32((void *)priv->regs + PCIETSTR, + DATA_LINK_ACTIVE, true, 50, false); +} + +static int rcar_gen3_pcie_hw_init(struct udevice *dev) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + int ret; + + /* Begin initialization */ + writel(0, priv->regs + PCIETCTLR); + + /* Set mode */ + writel(1, priv->regs + PCIEMSR); + + ret = rcar_gen3_pcie_wait_for_phyrdy(dev); + if (ret) + return ret; + + /* + * 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. + */ + writel(PCI_CLASS_BRIDGE_PCI << 16, priv->regs + IDSETR1); + + /* + * Setup Secondary Bus Number & Subordinate Bus Number, even though + * they aren't used, to avoid bridge being detected as broken. + */ + rcar_rmw32(dev, RCONF(PCI_SECONDARY_BUS), 0xff, 1); + rcar_rmw32(dev, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1); + + /* Initialize default capabilities. */ + rcar_rmw32(dev, REXPCAP(0), 0xff, PCI_CAP_ID_EXP); + rcar_rmw32(dev, REXPCAP(PCI_EXP_FLAGS), + PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4); + rcar_rmw32(dev, RCONF(PCI_HEADER_TYPE), 0x7f, + PCI_HEADER_TYPE_BRIDGE); + + /* Enable data link layer active state reporting */ + rcar_rmw32(dev, REXPCAP(PCI_EXP_LNKCAP), + PCI_EXP_LNKCAP_DLLLARC, PCI_EXP_LNKCAP_DLLLARC); + + /* Write out the physical slot number = 0 */ + rcar_rmw32(dev, REXPCAP(PCI_EXP_SLTCAP), + PCI_EXP_SLTCAP_PSN, 0); + + /* Set the completion timer timeout to the maximum 50ms. */ + rcar_rmw32(dev, TLCTLR + 1, 0x3f, 50); + + /* Terminate list of capabilities (Next Capability Offset=0) */ + rcar_rmw32(dev, RVCCAP(0), 0xfff00000, 0); + + /* Finish initialization - establish a PCI Express link */ + writel(CFINIT, priv->regs + PCIETCTLR); + + return rcar_gen3_pcie_wait_for_dl(dev); +} + +static int rcar_gen3_pcie_probe(struct udevice *dev) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + struct pci_controller *hose = dev_get_uclass_priv(dev); + struct clk pci_clk; + u32 mask; + int i, cnt, ret; + + ret = clk_get_by_index(dev, 0, &pci_clk); + if (ret) + return ret; + + ret = clk_enable(&pci_clk); + if (ret) + return ret; + + for (i = 0; i < hose->region_count; i++) { + if (hose->regions[i].flags != PCI_REGION_SYS_MEMORY) + continue; + + if (hose->regions[i].phys_start == 0) + continue; + + mask = (hose->regions[i].size - 1) & ~0xf; + mask |= LAR_ENABLE; + writel(hose->regions[i].phys_start, priv->regs + PCIEPRAR(0)); + writel(hose->regions[i].phys_start, priv->regs + PCIELAR(0)); + writel(mask, priv->regs + PCIELAMR(0)); + break; + } + + writel(0, priv->regs + PCIEPRAR(4)); + writel(0, priv->regs + PCIELAR(4)); + writel(0, priv->regs + PCIELAMR(4)); + + ret = rcar_gen3_pcie_hw_init(dev); + if (ret) + return ret; + + for (i = 0, cnt = 0; i < hose->region_count; i++) { + if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY) + continue; + + writel(0, priv->regs + PCIEPTCTLR(cnt)); + writel((hose->regions[i].size - 1) & ~0x7f, + priv->regs + PCIEPAMR(cnt)); + writel(upper_32_bits(hose->regions[i].phys_start), + priv->regs + PCIEPAUR(cnt)); + writel(lower_32_bits(hose->regions[i].phys_start), + priv->regs + PCIEPALR(cnt)); + mask = PAR_ENABLE; + if (hose->regions[i].flags == PCI_REGION_IO) + mask |= IO_SPACE; + writel(mask, priv->regs + PCIEPTCTLR(cnt)); + + cnt++; + } + + return 0; +} + +static int rcar_gen3_pcie_ofdata_to_platdata(struct udevice *dev) +{ + struct rcar_gen3_pcie_priv *priv = dev_get_priv(dev); + + priv->regs = devfdt_get_addr_index(dev, 0); + if (!priv->regs) + return -EINVAL; + + return 0; +} + +static const struct dm_pci_ops rcar_gen3_pcie_ops = { + .read_config = rcar_gen3_pcie_read_config, + .write_config = rcar_gen3_pcie_write_config, +}; + +static const struct udevice_id rcar_gen3_pcie_ids[] = { + { .compatible = "renesas,pcie-rcar-gen3" }, + { } +}; + +U_BOOT_DRIVER(rcar_gen3_pcie) = { + .name = "rcar_gen3_pcie", + .id = UCLASS_PCI, + .of_match = rcar_gen3_pcie_ids, + .ops = &rcar_gen3_pcie_ops, + .probe = rcar_gen3_pcie_probe, + .ofdata_to_platdata = rcar_gen3_pcie_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct rcar_gen3_pcie_priv), +};