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776abedef4
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>
411 lines
10 KiB
C
411 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Renesas RCar Gen3 PCIEC driver
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*
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* Copyright (C) 2018-2019 Marek Vasut <marek.vasut@gmail.com>
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*
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* Based on Linux PCIe driver for Renesas R-Car SoCs
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* Copyright (C) 2014 Renesas Electronics Europe Ltd
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*
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* Based on:
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* arch/sh/drivers/pci/pcie-sh7786.c
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* arch/sh/drivers/pci/ops-sh7786.c
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* Copyright (C) 2009 - 2011 Paul Mundt
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*
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* Author: Phil Edworthy <phil.edworthy@renesas.com>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <clk.h>
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#include <dm.h>
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#include <errno.h>
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#include <pci.h>
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#include <wait_bit.h>
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#define PCIECAR 0x000010
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#define PCIECCTLR 0x000018
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#define CONFIG_SEND_ENABLE BIT(31)
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#define TYPE0 (0 << 8)
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#define TYPE1 BIT(8)
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#define PCIECDR 0x000020
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#define PCIEMSR 0x000028
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#define PCIEINTXR 0x000400
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#define PCIEPHYSR 0x0007f0
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#define PHYRDY BIT(0)
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#define PCIEMSITXR 0x000840
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/* Transfer control */
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#define PCIETCTLR 0x02000
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#define CFINIT 1
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#define PCIETSTR 0x02004
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#define DATA_LINK_ACTIVE 1
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#define PCIEERRFR 0x02020
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#define UNSUPPORTED_REQUEST BIT(4)
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#define PCIEMSIFR 0x02044
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#define PCIEMSIALR 0x02048
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#define MSIFE 1
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#define PCIEMSIAUR 0x0204c
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#define PCIEMSIIER 0x02050
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/* root port address */
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#define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
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/* local address reg & mask */
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#define PCIELAR(x) (0x02200 + ((x) * 0x20))
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#define PCIELAMR(x) (0x02208 + ((x) * 0x20))
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#define LAM_PREFETCH BIT(3)
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#define LAM_64BIT BIT(2)
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#define LAR_ENABLE BIT(1)
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/* PCIe address reg & mask */
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#define PCIEPALR(x) (0x03400 + ((x) * 0x20))
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#define PCIEPAUR(x) (0x03404 + ((x) * 0x20))
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#define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
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#define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
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#define PAR_ENABLE BIT(31)
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#define IO_SPACE BIT(8)
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/* Configuration */
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#define PCICONF(x) (0x010000 + ((x) * 0x4))
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#define PMCAP(x) (0x010040 + ((x) * 0x4))
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#define EXPCAP(x) (0x010070 + ((x) * 0x4))
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#define VCCAP(x) (0x010100 + ((x) * 0x4))
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/* link layer */
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#define IDSETR1 0x011004
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#define TLCTLR 0x011048
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#define MACSR 0x011054
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#define SPCHGFIN BIT(4)
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#define SPCHGFAIL BIT(6)
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#define SPCHGSUC BIT(7)
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#define LINK_SPEED (0xf << 16)
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#define LINK_SPEED_2_5GTS (1 << 16)
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#define LINK_SPEED_5_0GTS (2 << 16)
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#define MACCTLR 0x011058
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#define SPEED_CHANGE BIT(24)
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#define SCRAMBLE_DISABLE BIT(27)
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#define MACS2R 0x011078
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#define MACCGSPSETR 0x011084
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#define SPCNGRSN BIT(31)
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/* R-Car H1 PHY */
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#define H1_PCIEPHYADRR 0x04000c
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#define WRITE_CMD BIT(16)
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#define PHY_ACK BIT(24)
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#define RATE_POS 12
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#define LANE_POS 8
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#define ADR_POS 0
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#define H1_PCIEPHYDOUTR 0x040014
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/* R-Car Gen2 PHY */
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#define GEN2_PCIEPHYADDR 0x780
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#define GEN2_PCIEPHYDATA 0x784
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#define GEN2_PCIEPHYCTRL 0x78c
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#define INT_PCI_MSI_NR 32
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#define RCONF(x) (PCICONF(0) + (x))
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#define RPMCAP(x) (PMCAP(0) + (x))
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#define REXPCAP(x) (EXPCAP(0) + (x))
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#define RVCCAP(x) (VCCAP(0) + (x))
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#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
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#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
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#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
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#define RCAR_PCI_MAX_RESOURCES 4
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#define MAX_NR_INBOUND_MAPS 6
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#define PCI_EXP_FLAGS 2 /* Capabilities register */
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#define PCI_EXP_FLAGS_TYPE 0x00f0 /* Device/Port type */
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#define PCI_EXP_TYPE_ROOT_PORT 0x4 /* Root Port */
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#define PCI_EXP_LNKCAP 12 /* Link Capabilities */
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#define PCI_EXP_LNKCAP_DLLLARC 0x00100000 /* Data Link Layer Link Active Reporting Capable */
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#define PCI_EXP_SLTCAP 20 /* Slot Capabilities */
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#define PCI_EXP_SLTCAP_PSN 0xfff80000 /* Physical Slot Number */
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enum {
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RCAR_PCI_ACCESS_READ,
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RCAR_PCI_ACCESS_WRITE,
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};
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struct rcar_gen3_pcie_priv {
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fdt_addr_t regs;
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};
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static void rcar_rmw32(struct udevice *dev, int where, u32 mask, u32 data)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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int shift = 8 * (where & 3);
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clrsetbits_le32(priv->regs + (where & ~3),
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mask << shift, data << shift);
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}
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static u32 rcar_read_conf(struct udevice *dev, int where)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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int shift = 8 * (where & 3);
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return readl(priv->regs + (where & ~3)) >> shift;
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}
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static int rcar_pcie_config_access(struct udevice *udev,
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unsigned char access_type,
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pci_dev_t bdf, int where, ulong *data)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(udev);
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u32 reg = where & ~3;
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/* Clear errors */
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clrbits_le32(priv->regs + PCIEERRFR, 0);
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/* Set the PIO address */
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writel((bdf << 8) | reg, priv->regs + PCIECAR);
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/* Enable the configuration access */
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if (!PCI_BUS(bdf))
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writel(CONFIG_SEND_ENABLE | TYPE0, priv->regs + PCIECCTLR);
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else
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writel(CONFIG_SEND_ENABLE | TYPE1, priv->regs + PCIECCTLR);
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/* Check for errors */
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if (readl(priv->regs + PCIEERRFR) & UNSUPPORTED_REQUEST)
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return -ENODEV;
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/* Check for master and target aborts */
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if (rcar_read_conf(udev, RCONF(PCI_STATUS)) &
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(PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
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return -ENODEV;
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if (access_type == RCAR_PCI_ACCESS_READ)
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*data = readl(priv->regs + PCIECDR);
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else
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writel(*data, priv->regs + PCIECDR);
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/* Disable the configuration access */
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writel(0, priv->regs + PCIECCTLR);
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return 0;
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}
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static int rcar_gen3_pcie_addr_valid(pci_dev_t d, uint where)
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{
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u32 slot;
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if (PCI_FUNC(d))
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return -EINVAL;
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slot = PCI_DEV(d);
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if (slot != 1)
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return -EINVAL;
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return 0;
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}
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static int rcar_gen3_pcie_read_config(struct udevice *dev, pci_dev_t bdf,
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uint where, ulong *val,
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enum pci_size_t size)
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{
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ulong reg;
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int ret;
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ret = rcar_gen3_pcie_addr_valid(bdf, where);
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if (ret) {
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*val = pci_get_ff(size);
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return 0;
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}
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ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_READ,
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bdf, where, ®);
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if (ret != 0)
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reg = 0xffffffffUL;
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*val = pci_conv_32_to_size(reg, where, size);
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return ret;
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}
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static int rcar_gen3_pcie_write_config(struct udevice *dev, pci_dev_t bdf,
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uint where, ulong val,
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enum pci_size_t size)
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{
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ulong data;
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int ret;
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ret = rcar_gen3_pcie_addr_valid(bdf, where);
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if (ret)
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return ret;
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data = pci_conv_32_to_size(val, where, size);
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ret = rcar_pcie_config_access(dev, RCAR_PCI_ACCESS_WRITE,
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bdf, where, &data);
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return ret;
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}
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static int rcar_gen3_pcie_wait_for_phyrdy(struct udevice *dev)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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return wait_for_bit_le32((void *)priv->regs + PCIEPHYSR, PHYRDY,
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true, 50, false);
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}
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static int rcar_gen3_pcie_wait_for_dl(struct udevice *dev)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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return wait_for_bit_le32((void *)priv->regs + PCIETSTR,
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DATA_LINK_ACTIVE, true, 50, false);
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}
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static int rcar_gen3_pcie_hw_init(struct udevice *dev)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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int ret;
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/* Begin initialization */
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writel(0, priv->regs + PCIETCTLR);
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/* Set mode */
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writel(1, priv->regs + PCIEMSR);
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ret = rcar_gen3_pcie_wait_for_phyrdy(dev);
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if (ret)
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return ret;
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/*
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* Initial header for port config space is type 1, set the device
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* class to match. Hardware takes care of propagating the IDSETR
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* settings, so there is no need to bother with a quirk.
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*/
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writel(PCI_CLASS_BRIDGE_PCI << 16, priv->regs + IDSETR1);
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/*
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* Setup Secondary Bus Number & Subordinate Bus Number, even though
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* they aren't used, to avoid bridge being detected as broken.
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*/
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rcar_rmw32(dev, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
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rcar_rmw32(dev, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
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/* Initialize default capabilities. */
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rcar_rmw32(dev, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
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rcar_rmw32(dev, REXPCAP(PCI_EXP_FLAGS),
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PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
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rcar_rmw32(dev, RCONF(PCI_HEADER_TYPE), 0x7f,
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PCI_HEADER_TYPE_BRIDGE);
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/* Enable data link layer active state reporting */
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rcar_rmw32(dev, REXPCAP(PCI_EXP_LNKCAP),
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PCI_EXP_LNKCAP_DLLLARC, PCI_EXP_LNKCAP_DLLLARC);
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/* Write out the physical slot number = 0 */
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rcar_rmw32(dev, REXPCAP(PCI_EXP_SLTCAP),
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PCI_EXP_SLTCAP_PSN, 0);
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/* Set the completion timer timeout to the maximum 50ms. */
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rcar_rmw32(dev, TLCTLR + 1, 0x3f, 50);
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/* Terminate list of capabilities (Next Capability Offset=0) */
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rcar_rmw32(dev, RVCCAP(0), 0xfff00000, 0);
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/* Finish initialization - establish a PCI Express link */
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writel(CFINIT, priv->regs + PCIETCTLR);
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return rcar_gen3_pcie_wait_for_dl(dev);
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}
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static int rcar_gen3_pcie_probe(struct udevice *dev)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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struct pci_controller *hose = dev_get_uclass_priv(dev);
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struct clk pci_clk;
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u32 mask;
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int i, cnt, ret;
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ret = clk_get_by_index(dev, 0, &pci_clk);
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if (ret)
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return ret;
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ret = clk_enable(&pci_clk);
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if (ret)
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return ret;
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for (i = 0; i < hose->region_count; i++) {
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if (hose->regions[i].flags != PCI_REGION_SYS_MEMORY)
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continue;
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if (hose->regions[i].phys_start == 0)
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continue;
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mask = (hose->regions[i].size - 1) & ~0xf;
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mask |= LAR_ENABLE;
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writel(hose->regions[i].phys_start, priv->regs + PCIEPRAR(0));
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writel(hose->regions[i].phys_start, priv->regs + PCIELAR(0));
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writel(mask, priv->regs + PCIELAMR(0));
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break;
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}
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writel(0, priv->regs + PCIEPRAR(4));
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writel(0, priv->regs + PCIELAR(4));
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writel(0, priv->regs + PCIELAMR(4));
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ret = rcar_gen3_pcie_hw_init(dev);
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if (ret)
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return ret;
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for (i = 0, cnt = 0; i < hose->region_count; i++) {
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if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY)
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continue;
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writel(0, priv->regs + PCIEPTCTLR(cnt));
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writel((hose->regions[i].size - 1) & ~0x7f,
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priv->regs + PCIEPAMR(cnt));
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writel(upper_32_bits(hose->regions[i].phys_start),
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priv->regs + PCIEPAUR(cnt));
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writel(lower_32_bits(hose->regions[i].phys_start),
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priv->regs + PCIEPALR(cnt));
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mask = PAR_ENABLE;
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if (hose->regions[i].flags == PCI_REGION_IO)
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mask |= IO_SPACE;
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writel(mask, priv->regs + PCIEPTCTLR(cnt));
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cnt++;
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}
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return 0;
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}
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static int rcar_gen3_pcie_ofdata_to_platdata(struct udevice *dev)
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{
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struct rcar_gen3_pcie_priv *priv = dev_get_platdata(dev);
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priv->regs = devfdt_get_addr_index(dev, 0);
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if (!priv->regs)
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return -EINVAL;
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return 0;
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}
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static const struct dm_pci_ops rcar_gen3_pcie_ops = {
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.read_config = rcar_gen3_pcie_read_config,
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.write_config = rcar_gen3_pcie_write_config,
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};
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static const struct udevice_id rcar_gen3_pcie_ids[] = {
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{ .compatible = "renesas,pcie-rcar-gen3" },
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{ }
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};
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U_BOOT_DRIVER(rcar_gen3_pcie) = {
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.name = "rcar_gen3_pcie",
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.id = UCLASS_PCI,
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.of_match = rcar_gen3_pcie_ids,
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.ops = &rcar_gen3_pcie_ops,
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.probe = rcar_gen3_pcie_probe,
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.ofdata_to_platdata = rcar_gen3_pcie_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct rcar_gen3_pcie_priv),
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};
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