[U-Boot] [PATCH v3 3/7] pcie: ti: add driver for AM65x PCIe RC
Sekhar Nori
nsekhar at ti.com
Thu Aug 1 13:42:57 UTC 2019
Add driver supporting PCIe root-complex available
on TI's AM65x SoC.
Signed-off-by: Sekhar Nori <nsekhar at ti.com>
---
drivers/pci/Kconfig | 6 +
drivers/pci/Makefile | 1 +
drivers/pci/pcie_dw_ti.c | 725 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 732 insertions(+)
create mode 100644 drivers/pci/pcie_dw_ti.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 3fe38f7315ed..bdfc0c17963f 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -145,4 +145,10 @@ config PCI_MVEBU
Say Y here if you want to enable PCIe controller support on
Armada XP/38x SoCs.
+config PCI_KEYSTONE
+ bool "TI Keystone PCIe controller"
+ depends on DM_PCI
+ help
+ Say Y here if you want to enable PCI controller support on AM654 SoC.
+
endif
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index b5ebd50c855f..e54a98b8c9c5 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -38,3 +38,4 @@ obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie_layerscape_gen4.o \
pcie_layerscape_gen4_fixup.o
obj-$(CONFIG_PCI_XILINX) += pcie_xilinx.o
obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
+obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o
diff --git a/drivers/pci/pcie_dw_ti.c b/drivers/pci/pcie_dw_ti.c
new file mode 100644
index 000000000000..b37fc2de7fb8
--- /dev/null
+++ b/drivers/pci/pcie_dw_ti.c
@@ -0,0 +1,725 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Texas Instruments, Inc
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pci.h>
+#include <generic-phy.h>
+#include <power-domain.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <asm-generic/gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define PCIE_VENDORID_MASK GENMASK(15, 0)
+#define PCIE_DEVICEID_SHIFT 16
+
+/* PCI DBICS registers */
+#define PCIE_CONFIG_BAR0 0x10
+#define PCIE_LINK_STATUS_REG 0x80
+#define PCIE_LINK_STATUS_SPEED_OFF 16
+#define PCIE_LINK_STATUS_SPEED_MASK (0xf << PCIE_LINK_STATUS_SPEED_OFF)
+#define PCIE_LINK_STATUS_WIDTH_OFF 20
+#define PCIE_LINK_STATUS_WIDTH_MASK (0xf << PCIE_LINK_STATUS_WIDTH_OFF)
+
+#define PCIE_LINK_CAPABILITY 0x7c
+#define PCIE_LINK_CTL_2 0xa0
+#define TARGET_LINK_SPEED_MASK 0xf
+#define LINK_SPEED_GEN_1 0x1
+#define LINK_SPEED_GEN_2 0x2
+#define LINK_SPEED_GEN_3 0x3
+
+#define PCIE_MISC_CONTROL_1_OFF 0x8bc
+#define PCIE_DBI_RO_WR_EN BIT(0)
+
+#define PLR_OFFSET 0x700
+#define PCIE_PORT_DEBUG0 (PLR_OFFSET + 0x28)
+#define PORT_LOGIC_LTSSM_STATE_MASK 0x1f
+#define PORT_LOGIC_LTSSM_STATE_L0 0x11
+
+#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80c
+#define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
+
+#define PCIE_LINK_UP_TIMEOUT_MS 100
+
+/*
+ * iATU Unroll-specific register definitions
+ * From 4.80 core version the address translation will be made by unroll.
+ * The registers are offset from atu_base
+ */
+#define PCIE_ATU_UNR_REGION_CTRL1 0x00
+#define PCIE_ATU_UNR_REGION_CTRL2 0x04
+#define PCIE_ATU_UNR_LOWER_BASE 0x08
+#define PCIE_ATU_UNR_UPPER_BASE 0x0c
+#define PCIE_ATU_UNR_LIMIT 0x10
+#define PCIE_ATU_UNR_LOWER_TARGET 0x14
+#define PCIE_ATU_UNR_UPPER_TARGET 0x18
+
+#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
+#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
+#define PCIE_ATU_TYPE_MEM (0x0 << 0)
+#define PCIE_ATU_TYPE_IO (0x2 << 0)
+#define PCIE_ATU_TYPE_CFG0 (0x4 << 0)
+#define PCIE_ATU_TYPE_CFG1 (0x5 << 0)
+#define PCIE_ATU_ENABLE (0x1 << 31)
+#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
+#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
+#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
+#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
+
+/* Register address builder */
+#define PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(region) ((region) << 9)
+
+/* Offsets from App base */
+#define PCIE_CMD_STATUS 0x04
+#define LTSSM_EN_VAL BIT(0)
+
+/* Parameters for the waiting for iATU enabled routine */
+#define LINK_WAIT_MAX_IATU_RETRIES 5
+#define LINK_WAIT_IATU 10000
+
+#define AM654_PCIE_DEV_TYPE_MASK 0x3
+#define EP 0x0
+#define LEG_EP 0x1
+#define RC 0x2
+
+/**
+ * struct pcie_dw_ti - TI DW PCIe controller state
+ *
+ * @app_base: The base address of application register space
+ * @dbics_base: The base address of dbics register space
+ * @cfg_base: The base address of configuration space
+ * @atu_base: The base address of ATU space
+ * @cfg_size: The size of the configuration space which is needed
+ * as it gets written into the PCIE_ATU_LIMIT register
+ * @first_busno: This driver supports multiple PCIe controllers.
+ * first_busno stores the bus number of the PCIe root-port
+ * number which may vary depending on the PCIe setup
+ * (PEX switches etc).
+ */
+struct pcie_dw_ti {
+ void *app_base;
+ void *dbi_base;
+ void *cfg_base;
+ void *atu_base;
+ fdt_size_t cfg_size;
+ int first_busno;
+ struct udevice *dev;
+
+ /* IO and MEM PCI regions */
+ struct pci_region io;
+ struct pci_region mem;
+};
+
+enum dw_pcie_device_mode {
+ DW_PCIE_UNKNOWN_TYPE,
+ DW_PCIE_EP_TYPE,
+ DW_PCIE_LEG_EP_TYPE,
+ DW_PCIE_RC_TYPE,
+};
+
+static int pcie_dw_get_link_speed(struct pcie_dw_ti *pci)
+{
+ return (readl(pci->dbi_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
+}
+
+static int pcie_dw_get_link_width(struct pcie_dw_ti *pci)
+{
+ return (readl(pci->dbi_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
+}
+
+static void dw_pcie_writel_ob_unroll(struct pcie_dw_ti *pci, u32 index, u32 reg,
+ u32 val)
+{
+ u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
+ void __iomem *base = pci->atu_base;
+
+ writel(val, base + offset + reg);
+}
+
+static u32 dw_pcie_readl_ob_unroll(struct pcie_dw_ti *pci, u32 index, u32 reg)
+{
+ u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
+ void __iomem *base = pci->atu_base;
+
+ return readl(base + offset + reg);
+}
+
+/**
+ * pcie_dw_prog_outbound_atu_unroll() - Configure ATU for outbound accesses
+ *
+ * @pcie: Pointer to the PCI controller state
+ * @index: ATU region index
+ * @type: ATU accsess type
+ * @cpu_addr: the physical address for the translation entry
+ * @pci_addr: the pcie bus address for the translation entry
+ * @size: the size of the translation entry
+ */
+static void pcie_dw_prog_outbound_atu_unroll(struct pcie_dw_ti *pci, int index,
+ int type, u64 cpu_addr,
+ u64 pci_addr, u32 size)
+{
+ u32 retries, val;
+
+ debug("ATU programmed with: index: %d, type: %d, cpu addr: %8llx, pci addr: %8llx, size: %8x\n",
+ index, type, cpu_addr, pci_addr, size);
+
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_BASE,
+ lower_32_bits(cpu_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_BASE,
+ upper_32_bits(cpu_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LIMIT,
+ lower_32_bits(cpu_addr + size - 1));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_LOWER_TARGET,
+ lower_32_bits(pci_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET,
+ upper_32_bits(pci_addr));
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1,
+ type);
+ dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2,
+ PCIE_ATU_ENABLE);
+
+ /*
+ * Make sure ATU enable takes effect before any subsequent config
+ * and I/O accesses.
+ */
+ for (retries = 0; retries < LINK_WAIT_MAX_IATU_RETRIES; retries++) {
+ val = dw_pcie_readl_ob_unroll(pci, index,
+ PCIE_ATU_UNR_REGION_CTRL2);
+ if (val & PCIE_ATU_ENABLE)
+ return;
+
+ udelay(LINK_WAIT_IATU);
+ }
+ dev_err(pci->dev, "outbound iATU is not being enabled\n");
+}
+
+/**
+ * set_cfg_address() - Configure the PCIe controller config space access
+ *
+ * @pcie: Pointer to the PCI controller state
+ * @d: PCI device to access
+ * @where: Offset in the configuration space
+ *
+ * Configures the PCIe controller to access the configuration space of
+ * a specific PCIe device and returns the address to use for this
+ * access.
+ *
+ * Return: Address that can be used to access the configation space
+ * of the requested device / offset
+ */
+static uintptr_t set_cfg_address(struct pcie_dw_ti *pcie,
+ pci_dev_t d, uint where)
+{
+ int bus = PCI_BUS(d) - pcie->first_busno;
+ uintptr_t va_address;
+ u32 atu_type;
+
+ /* Use dbi_base for own configuration read and write */
+ if (!bus) {
+ va_address = (uintptr_t)pcie->dbi_base;
+ goto out;
+ }
+
+ if (bus == 1)
+ /* For local bus, change TLP Type field to 4. */
+ atu_type = PCIE_ATU_TYPE_CFG0;
+ else
+ /* Otherwise, change TLP Type field to 5. */
+ atu_type = PCIE_ATU_TYPE_CFG1;
+
+ /*
+ * Not accessing root port configuration space?
+ * Region #0 is used for Outbound CFG space access.
+ * Direction = Outbound
+ * Region Index = 0
+ */
+ d = PCI_MASK_BUS(d);
+ d = PCI_ADD_BUS(bus, d);
+ pcie_dw_prog_outbound_atu_unroll(pcie, PCIE_ATU_REGION_INDEX1,
+ atu_type, (u64)pcie->cfg_base,
+ d << 8, pcie->cfg_size);
+
+ va_address = (uintptr_t)pcie->cfg_base;
+
+out:
+ va_address += where & ~0x3;
+
+ return va_address;
+}
+
+/**
+ * pcie_dw_addr_valid() - Check for valid bus address
+ *
+ * @d: The PCI device to access
+ * @first_busno: Bus number of the PCIe controller root complex
+ *
+ * Return 1 (true) if the PCI device can be accessed by this controller.
+ *
+ * Return: 1 on valid, 0 on invalid
+ */
+static int pcie_dw_addr_valid(pci_dev_t d, int first_busno)
+{
+ if ((PCI_BUS(d) == first_busno) && (PCI_DEV(d) > 0))
+ return 0;
+ if ((PCI_BUS(d) == first_busno + 1) && (PCI_DEV(d) > 0))
+ return 0;
+
+ return 1;
+}
+
+/**
+ * pcie_dw_ti_read_config() - Read from configuration space
+ *
+ * @bus: Pointer to the PCI bus
+ * @bdf: Identifies the PCIe device to access
+ * @offset: The offset into the device's configuration space
+ * @valuep: A pointer at which to store the read value
+ * @size: Indicates the size of access to perform
+ *
+ * Read a value of size @size from offset @offset within the configuration
+ * space of the device identified by the bus, device & function numbers in @bdf
+ * on the PCI bus @bus.
+ *
+ * Return: 0 on success
+ */
+static int pcie_dw_ti_read_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct pcie_dw_ti *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong value;
+
+ debug("PCIE CFG read: bdf=%2x:%2x:%2x ",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
+
+ if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
+ debug("- out of range\n");
+ *valuep = pci_get_ff(size);
+ return 0;
+ }
+
+ va_address = set_cfg_address(pcie, bdf, offset);
+
+ value = readl(va_address);
+
+ debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
+ *valuep = pci_conv_32_to_size(value, offset, size);
+
+ pcie_dw_prog_outbound_atu_unroll(pcie, PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_IO, pcie->io.phys_start,
+ pcie->io.bus_start, pcie->io.size);
+
+ return 0;
+}
+
+/**
+ * pcie_dw_ti_write_config() - Write to configuration space
+ *
+ * @bus: Pointer to the PCI bus
+ * @bdf: Identifies the PCIe device to access
+ * @offset: The offset into the device's configuration space
+ * @value: The value to write
+ * @size: Indicates the size of access to perform
+ *
+ * Write the value @value of size @size from offset @offset within the
+ * configuration space of the device identified by the bus, device & function
+ * numbers in @bdf on the PCI bus @bus.
+ *
+ * Return: 0 on success
+ */
+static int pcie_dw_ti_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct pcie_dw_ti *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong old;
+
+ debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
+ PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
+ debug("(addr,val)=(0x%04x, 0x%08lx)\n", offset, value);
+
+ if (!pcie_dw_addr_valid(bdf, pcie->first_busno)) {
+ debug("- out of range\n");
+ return 0;
+ }
+
+ va_address = set_cfg_address(pcie, bdf, offset);
+
+ old = readl(va_address);
+ value = pci_conv_size_to_32(old, value, offset, size);
+ writel(value, va_address);
+
+ pcie_dw_prog_outbound_atu_unroll(pcie, PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_IO, pcie->io.phys_start,
+ pcie->io.bus_start, pcie->io.size);
+
+ return 0;
+}
+
+static inline void dw_pcie_dbi_write_enable(struct pcie_dw_ti *pci, bool en)
+{
+ u32 val;
+
+ val = readl(pci->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+ if (en)
+ val |= PCIE_DBI_RO_WR_EN;
+ else
+ val &= ~PCIE_DBI_RO_WR_EN;
+ writel(val, pci->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+}
+
+/**
+ * pcie_dw_configure() - Configure link capabilities and speed
+ *
+ * @regs_base: A pointer to the PCIe controller registers
+ * @cap_speed: The capabilities and speed to configure
+ *
+ * Configure the link capabilities and speed in the PCIe root complex.
+ */
+static void pcie_dw_configure(struct pcie_dw_ti *pci, u32 cap_speed)
+{
+ u32 val;
+
+ dw_pcie_dbi_write_enable(pci, true);
+
+ val = readl(pci->dbi_base + PCIE_LINK_CAPABILITY);
+ val &= ~TARGET_LINK_SPEED_MASK;
+ val |= cap_speed;
+ writel(val, pci->dbi_base + PCIE_LINK_CAPABILITY);
+
+ val = readl(pci->dbi_base + PCIE_LINK_CTL_2);
+ val &= ~TARGET_LINK_SPEED_MASK;
+ val |= cap_speed;
+ writel(val, pci->dbi_base + PCIE_LINK_CTL_2);
+
+ dw_pcie_dbi_write_enable(pci, false);
+}
+
+/**
+ * is_link_up() - Return the link state
+ *
+ * @regs_base: A pointer to the PCIe DBICS registers
+ *
+ * Return: 1 (true) for active line and 0 (false) for no link
+ */
+static int is_link_up(struct pcie_dw_ti *pci)
+{
+ u32 val;
+
+ val = readl(pci->dbi_base + PCIE_PORT_DEBUG0);
+ val &= PORT_LOGIC_LTSSM_STATE_MASK;
+
+ return (val == PORT_LOGIC_LTSSM_STATE_L0);
+}
+
+/**
+ * wait_link_up() - Wait for the link to come up
+ *
+ * @regs_base: A pointer to the PCIe controller registers
+ *
+ * Return: 1 (true) for active line and 0 (false) for no link (timeout)
+ */
+static int wait_link_up(struct pcie_dw_ti *pci)
+{
+ unsigned long timeout;
+
+ timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
+ while (!is_link_up(pci)) {
+ if (get_timer(0) > timeout)
+ return 0;
+ };
+
+ return 1;
+}
+
+static int pcie_dw_ti_pcie_link_up(struct pcie_dw_ti *pci, u32 cap_speed)
+{
+ u32 val;
+
+ if (is_link_up(pci)) {
+ printf("PCI Link already up before configuration!\n");
+ return 1;
+ }
+
+ /* DW pre link configurations */
+ pcie_dw_configure(pci, cap_speed);
+
+ /* Initiate link training */
+ val = readl(pci->app_base + PCIE_CMD_STATUS);
+ val |= LTSSM_EN_VAL;
+ writel(val, pci->app_base + PCIE_CMD_STATUS);
+
+ /* Check that link was established */
+ if (!wait_link_up(pci))
+ return 0;
+
+ /*
+ * Link can be established in Gen 1. still need to wait
+ * till MAC nagaotiation is completed
+ */
+ udelay(100);
+
+ return 1;
+}
+
+/**
+ * pcie_dw_setup_host() - Setup the PCIe controller for RC opertaion
+ *
+ * @pcie: Pointer to the PCI controller state
+ *
+ * Configure the host BARs of the PCIe controller root port so that
+ * PCI(e) devices may access the system memory.
+ */
+static void pcie_dw_setup_host(struct pcie_dw_ti *pci)
+{
+ u32 val;
+
+ /* setup RC BARs */
+ writel(PCI_BASE_ADDRESS_MEM_TYPE_64,
+ pci->dbi_base + PCI_BASE_ADDRESS_0);
+ writel(0x0, pci->dbi_base + PCI_BASE_ADDRESS_1);
+
+ /* setup interrupt pins */
+ dw_pcie_dbi_write_enable(pci, true);
+ val = readl(pci->dbi_base + PCI_INTERRUPT_LINE);
+ val &= 0xffff00ff;
+ val |= 0x00000100;
+ writel(val, pci->dbi_base + PCI_INTERRUPT_LINE);
+ dw_pcie_dbi_write_enable(pci, false);
+
+ /* setup bus numbers */
+ val = readl(pci->dbi_base + PCI_PRIMARY_BUS);
+ val &= 0xff000000;
+ val |= 0x00ff0100;
+ writel(val, pci->dbi_base + PCI_PRIMARY_BUS);
+
+ /* setup command register */
+ val = readl(pci->dbi_base + PCI_COMMAND);
+ val &= 0xffff0000;
+ val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
+ writel(val, pci->dbi_base + PCI_COMMAND);
+
+ /* Enable write permission for the DBI read-only register */
+ dw_pcie_dbi_write_enable(pci, true);
+ /* program correct class for RC */
+ writew(PCI_CLASS_BRIDGE_PCI, pci->dbi_base + PCI_CLASS_DEVICE);
+ /* Better disable write permission right after the update */
+ dw_pcie_dbi_write_enable(pci, false);
+
+ val = readl(pci->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
+ val |= PORT_LOGIC_SPEED_CHANGE;
+ writel(val, pci->dbi_base + PCIE_LINK_WIDTH_SPEED_CONTROL);
+}
+
+static int pcie_am654_set_mode(struct pcie_dw_ti *pci,
+ enum dw_pcie_device_mode mode)
+{
+ struct regmap *syscon;
+ u32 val;
+ u32 mask;
+ int ret;
+
+ syscon = syscon_regmap_lookup_by_phandle(pci->dev,
+ "ti,syscon-pcie-mode");
+ if (IS_ERR(syscon))
+ return 0;
+
+ mask = AM654_PCIE_DEV_TYPE_MASK;
+
+ switch (mode) {
+ case DW_PCIE_RC_TYPE:
+ val = RC;
+ break;
+ case DW_PCIE_EP_TYPE:
+ val = EP;
+ break;
+ default:
+ dev_err(pci->dev, "INVALID device type %d\n", mode);
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(syscon, 0, mask, val);
+ if (ret) {
+ dev_err(pci->dev, "failed to set pcie mode\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int pcie_dw_init_id(struct pcie_dw_ti *pci)
+{
+ struct regmap *devctrl_regs;
+ unsigned int id;
+ int ret;
+
+ devctrl_regs = syscon_regmap_lookup_by_phandle(pci->dev,
+ "ti,syscon-pcie-id");
+ if (IS_ERR(devctrl_regs))
+ return PTR_ERR(devctrl_regs);
+
+ ret = regmap_read(devctrl_regs, 0, &id);
+ if (ret)
+ return ret;
+
+ dw_pcie_dbi_write_enable(pci, true);
+ writew(id & PCIE_VENDORID_MASK, pci->dbi_base + PCI_VENDOR_ID);
+ writew(id >> PCIE_DEVICEID_SHIFT, pci->dbi_base + PCI_DEVICE_ID);
+ dw_pcie_dbi_write_enable(pci, false);
+
+ return 0;
+}
+
+/**
+ * pcie_dw_ti_probe() - Probe the PCIe bus for active link
+ *
+ * @dev: A pointer to the device being operated on
+ *
+ * Probe for an active link on the PCIe bus and configure the controller
+ * to enable this port.
+ *
+ * Return: 0 on success, else -ENODEV
+ */
+static int pcie_dw_ti_probe(struct udevice *dev)
+{
+ struct pcie_dw_ti *pci = dev_get_priv(dev);
+ struct udevice *ctlr = pci_get_controller(dev);
+ struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+ struct power_domain pci_pwrdmn;
+ struct phy phy0, phy1;
+ int ret;
+
+ ret = power_domain_get_by_index(dev, &pci_pwrdmn, 0);
+ if (ret) {
+ dev_err(dev, "failed to get power domain\n");
+ return ret;
+ }
+
+ ret = power_domain_on(&pci_pwrdmn);
+ if (ret) {
+ dev_err(dev, "Power domain on failed\n");
+ return ret;
+ }
+
+ ret = generic_phy_get_by_name(dev, "pcie-phy0", &phy0);
+ if (ret) {
+ dev_err(dev, "Unable to get phy0");
+ return ret;
+ }
+ generic_phy_reset(&phy0);
+ generic_phy_init(&phy0);
+ generic_phy_power_on(&phy0);
+
+ ret = generic_phy_get_by_name(dev, "pcie-phy1", &phy1);
+ if (ret) {
+ dev_err(dev, "Unable to get phy1");
+ return ret;
+ }
+ generic_phy_reset(&phy1);
+ generic_phy_init(&phy1);
+ generic_phy_power_on(&phy1);
+
+ pci->first_busno = dev->seq;
+ pci->dev = dev;
+
+ pcie_dw_setup_host(pci);
+ pcie_dw_init_id(pci);
+
+ if (device_is_compatible(dev, "ti,am654-pcie-rc"))
+ pcie_am654_set_mode(pci, DW_PCIE_RC_TYPE);
+
+ if (!pcie_dw_ti_pcie_link_up(pci, LINK_SPEED_GEN_2)) {
+ printf("PCIE-%d: Link down\n", dev->seq);
+ return -ENODEV;
+ }
+
+ printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n", dev->seq,
+ pcie_dw_get_link_speed(pci),
+ pcie_dw_get_link_width(pci),
+ hose->first_busno);
+
+ /* Store the IO and MEM windows settings for future use by the ATU */
+ pci->io.phys_start = hose->regions[0].phys_start; /* IO base */
+ pci->io.bus_start = hose->regions[0].bus_start; /* IO_bus_addr */
+ pci->io.size = hose->regions[0].size; /* IO size */
+
+ pci->mem.phys_start = hose->regions[1].phys_start; /* MEM base */
+ pci->mem.bus_start = hose->regions[1].bus_start; /* MEM_bus_addr */
+ pci->mem.size = hose->regions[1].size; /* MEM size */
+
+ pcie_dw_prog_outbound_atu_unroll(pci, PCIE_ATU_REGION_INDEX0,
+ PCIE_ATU_TYPE_MEM,
+ pci->mem.phys_start,
+ pci->mem.bus_start, pci->mem.size);
+
+ return 0;
+}
+
+/**
+ * pcie_dw_ti_ofdata_to_platdata() - Translate from DT to device state
+ *
+ * @dev: A pointer to the device being operated on
+ *
+ * Translate relevant data from the device tree pertaining to device @dev into
+ * state that the driver will later make use of. This state is stored in the
+ * device's private data structure.
+ *
+ * Return: 0 on success, else -EINVAL
+ */
+static int pcie_dw_ti_ofdata_to_platdata(struct udevice *dev)
+{
+ struct pcie_dw_ti *pcie = dev_get_priv(dev);
+
+ /* Get the controller base address */
+ pcie->dbi_base = (void *)dev_read_addr_name(dev, "dbics");
+ if ((fdt_addr_t)pcie->dbi_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ /* Get the config space base address and size */
+ pcie->cfg_base = (void *)dev_read_addr_size_name(dev, "config",
+ &pcie->cfg_size);
+ if ((fdt_addr_t)pcie->cfg_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ /* Get the iATU base address and size */
+ pcie->atu_base = (void *)dev_read_addr_name(dev, "atu");
+ if ((fdt_addr_t)pcie->atu_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ /* Get the app base address and size */
+ pcie->app_base = (void *)dev_read_addr_name(dev, "app");
+ if ((fdt_addr_t)pcie->app_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct dm_pci_ops pcie_dw_ti_ops = {
+ .read_config = pcie_dw_ti_read_config,
+ .write_config = pcie_dw_ti_write_config,
+};
+
+static const struct udevice_id pcie_dw_ti_ids[] = {
+ { .compatible = "ti,am654-pcie-rc" },
+ { }
+};
+
+U_BOOT_DRIVER(pcie_dw_ti) = {
+ .name = "pcie_dw_ti",
+ .id = UCLASS_PCI,
+ .of_match = pcie_dw_ti_ids,
+ .ops = &pcie_dw_ti_ops,
+ .ofdata_to_platdata = pcie_dw_ti_ofdata_to_platdata,
+ .probe = pcie_dw_ti_probe,
+ .priv_auto_alloc_size = sizeof(struct pcie_dw_ti),
+};
--
2.16.2
More information about the U-Boot
mailing list