[U-Boot] [PATCH 1/2] pci: renesas: Add RCar Gen3 PCIe controller driver
Marek Vasut
marek.vasut at gmail.com
Sat May 18 22:24:26 UTC 2019
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 at gmail.com>
Cc: Bin Meng <bmeng.cn at gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu at 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 at 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 at 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),
+};
--
2.20.1
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