--- /dev/null
+/*
+ * Copyright (C) 2015 Marvell International Ltd.
+ *
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * Based on:
+ * - drivers/pci/pcie_imx.c
+ * - drivers/pci/pci_mvebu.c
+ * - drivers/pci/pcie_xilinx.c
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pci.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* PCI Config space 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)
+
+/* Resizable bar capability registers */
+#define RESIZABLE_BAR_CAP 0x250
+#define RESIZABLE_BAR_CTL0 0x254
+#define RESIZABLE_BAR_CTL1 0x258
+
+/* iATU registers */
+#define PCIE_ATU_VIEWPORT 0x900
+#define PCIE_ATU_REGION_INBOUND (0x1 << 31)
+#define PCIE_ATU_REGION_OUTBOUND (0x0 << 31)
+#define PCIE_ATU_REGION_INDEX1 (0x1 << 0)
+#define PCIE_ATU_REGION_INDEX0 (0x0 << 0)
+#define PCIE_ATU_CR1 0x904
+#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_CR2 0x908
+#define PCIE_ATU_ENABLE (0x1 << 31)
+#define PCIE_ATU_BAR_MODE_ENABLE (0x1 << 30)
+#define PCIE_ATU_LOWER_BASE 0x90C
+#define PCIE_ATU_UPPER_BASE 0x910
+#define PCIE_ATU_LIMIT 0x914
+#define PCIE_ATU_LOWER_TARGET 0x918
+#define PCIE_ATU_BUS(x) (((x) & 0xff) << 24)
+#define PCIE_ATU_DEV(x) (((x) & 0x1f) << 19)
+#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
+#define PCIE_ATU_UPPER_TARGET 0x91C
+
+#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_GEN3_RELATED 0x890
+#define GEN3_EQU_DISABLE (1 << 16)
+#define GEN3_ZRXDC_NON_COMP (1 << 0)
+
+#define PCIE_GEN3_EQU_CTRL 0x8A8
+#define GEN3_EQU_EVAL_2MS_DISABLE (1 << 5)
+
+#define PCIE_ROOT_COMPLEX_MODE_MASK (0xF << 4)
+
+#define PCIE_LINK_UP_TIMEOUT_MS 100
+
+#define PCIE_GLOBAL_CONTROL 0x8000
+#define PCIE_APP_LTSSM_EN (1 << 2)
+#define PCIE_DEVICE_TYPE_OFFSET (4)
+#define PCIE_DEVICE_TYPE_MASK (0xF)
+#define PCIE_DEVICE_TYPE_EP (0x0) /* Endpoint */
+#define PCIE_DEVICE_TYPE_LEP (0x1) /* Legacy endpoint */
+#define PCIE_DEVICE_TYPE_RC (0x4) /* Root complex */
+
+#define PCIE_GLOBAL_STATUS 0x8008
+#define PCIE_GLB_STS_RDLH_LINK_UP (1 << 1)
+#define PCIE_GLB_STS_PHY_LINK_UP (1 << 9)
+
+#define PCIE_ARCACHE_TRC 0x8050
+#define PCIE_AWCACHE_TRC 0x8054
+#define ARCACHE_SHAREABLE_CACHEABLE 0x3511
+#define AWCACHE_SHAREABLE_CACHEABLE 0x5311
+
+#define LINK_SPEED_GEN_1 0x1
+#define LINK_SPEED_GEN_2 0x2
+#define LINK_SPEED_GEN_3 0x3
+
+/**
+ * struct pcie_dw_mvebu - MVEBU DW PCIe controller state
+ *
+ * @ctrl_base: The base address of the register space
+ * @cfg_base: The base address of the configuration 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_mvebu {
+ void *ctrl_base;
+ void *cfg_base;
+ fdt_size_t cfg_size;
+ int first_busno;
+};
+
+static int pcie_dw_get_link_speed(const void *regs_base)
+{
+ return (readl(regs_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_SPEED_MASK) >> PCIE_LINK_STATUS_SPEED_OFF;
+}
+
+static int pcie_dw_get_link_width(const void *regs_base)
+{
+ return (readl(regs_base + PCIE_LINK_STATUS_REG) &
+ PCIE_LINK_STATUS_WIDTH_MASK) >> PCIE_LINK_STATUS_WIDTH_OFF;
+}
+
+/**
+ * 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_mvebu *pcie,
+ pci_dev_t d, uint where)
+{
+ uintptr_t va_address;
+
+ /*
+ * Region #0 is used for Outbound CFG space access.
+ * Direction = Outbound
+ * Region Index = 0
+ */
+ writel(0, pcie->ctrl_base + PCIE_ATU_VIEWPORT);
+
+ if (PCI_BUS(d) == (pcie->first_busno + 1))
+ /* For local bus, change TLP Type field to 4. */
+ writel(PCIE_ATU_TYPE_CFG0, pcie->ctrl_base + PCIE_ATU_CR1);
+ else
+ /* Otherwise, change TLP Type field to 5. */
+ writel(PCIE_ATU_TYPE_CFG1, pcie->ctrl_base + PCIE_ATU_CR1);
+
+ if (PCI_BUS(d) == pcie->first_busno) {
+ /* Accessing root port configuration space. */
+ va_address = (uintptr_t)pcie->ctrl_base;
+ } else {
+ writel(d << 8, pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
+ va_address = (uintptr_t)pcie->cfg_base;
+ }
+
+ 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_mvebu_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_mvebu_read_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ struct pcie_dw_mvebu *pcie = dev_get_priv(bus);
+ uintptr_t va_address;
+ ulong value;
+
+ debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
+ 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);
+
+ return 0;
+}
+
+/**
+ * pcie_dw_mvebu_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_mvebu_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ struct pcie_dw_mvebu *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);
+
+ return 0;
+}
+
+/**
+ * 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(const void *regs_base, u32 cap_speed)
+{
+ /*
+ * TODO (shadi@marvell.com, sr@denx.de):
+ * Need to read the serdes speed from the dts and according to it
+ * configure the PCIe gen
+ */
+
+ /* Set link to GEN 3 */
+ clrsetbits_le32(regs_base + PCIE_LINK_CTL_2,
+ TARGET_LINK_SPEED_MASK, cap_speed);
+ clrsetbits_le32(regs_base + PCIE_LINK_CAPABILITY,
+ TARGET_LINK_SPEED_MASK, cap_speed);
+ setbits_le32(regs_base + PCIE_GEN3_EQU_CTRL, GEN3_EQU_EVAL_2MS_DISABLE);
+}
+
+/**
+ * is_link_up() - Return the link state
+ *
+ * @regs_base: A pointer to the PCIe controller registers
+ *
+ * Return: 1 (true) for active line and 0 (false) for no link
+ */
+static int is_link_up(const void *regs_base)
+{
+ u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
+ u32 reg;
+
+ reg = readl(regs_base + PCIE_GLOBAL_STATUS);
+ if ((reg & mask) == mask)
+ return 1;
+
+ return 0;
+}
+
+/**
+ * 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(const void *regs_base)
+{
+ unsigned long timeout;
+
+ timeout = get_timer(0) + PCIE_LINK_UP_TIMEOUT_MS;
+ while (!is_link_up(regs_base)) {
+ if (get_timer(0) > timeout)
+ return 0;
+ };
+
+ return 1;
+}
+
+/**
+ * pcie_dw_mvebu_pcie_link_up() - Configure the PCIe root port
+ *
+ * @regs_base: A pointer to the PCIe controller registers
+ * @cap_speed: The capabilities and speed to configure
+ *
+ * Configure the PCIe controller root complex depending on the
+ * requested link capabilities and speed.
+ *
+ * Return: 1 (true) for active line and 0 (false) for no link
+ */
+static int pcie_dw_mvebu_pcie_link_up(const void *regs_base, u32 cap_speed)
+{
+ if (!is_link_up(regs_base)) {
+ /* Disable LTSSM state machine to enable configuration */
+ clrbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
+ PCIE_APP_LTSSM_EN);
+ }
+
+ clrsetbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
+ PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_OFFSET,
+ PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_OFFSET);
+
+ /* Set the PCIe master AXI attributes */
+ writel(ARCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_ARCACHE_TRC);
+ writel(AWCACHE_SHAREABLE_CACHEABLE, regs_base + PCIE_AWCACHE_TRC);
+
+ /* DW pre link configurations */
+ pcie_dw_configure(regs_base, cap_speed);
+
+ if (!is_link_up(regs_base)) {
+ /* Configuration done. Start LTSSM */
+ setbits_le32(regs_base + PCIE_GLOBAL_CONTROL,
+ PCIE_APP_LTSSM_EN);
+ }
+
+ /* Check that link was established */
+ if (!wait_link_up(regs_base))
+ return 0;
+
+ /*
+ * Link can be established in Gen 1. still need to wait
+ * till MAC nagaotiation is completed
+ */
+ udelay(100);
+
+ return 1;
+}
+
+/**
+ * pcie_dw_regions_setup() - iATU region setup
+ *
+ * @pcie: Pointer to the PCI controller state
+ *
+ * Configure the iATU regions in the PCIe controller for outbound access.
+ */
+static void pcie_dw_regions_setup(struct pcie_dw_mvebu *pcie)
+{
+ /*
+ * Region #0 is used for Outbound CFG space access.
+ * Direction = Outbound
+ * Region Index = 0
+ */
+ writel(0, pcie->ctrl_base + PCIE_ATU_VIEWPORT);
+
+ writel((u32)(uintptr_t)pcie->cfg_base, pcie->ctrl_base
+ + PCIE_ATU_LOWER_BASE);
+ writel(0, pcie->ctrl_base + PCIE_ATU_UPPER_BASE);
+ writel((u32)(uintptr_t)pcie->cfg_base + pcie->cfg_size,
+ pcie->ctrl_base + PCIE_ATU_LIMIT);
+
+ writel(0, pcie->ctrl_base + PCIE_ATU_LOWER_TARGET);
+ writel(0, pcie->ctrl_base + PCIE_ATU_UPPER_TARGET);
+ writel(PCIE_ATU_TYPE_CFG0, pcie->ctrl_base + PCIE_ATU_CR1);
+ writel(PCIE_ATU_ENABLE, pcie->ctrl_base + PCIE_ATU_CR2);
+}
+
+/**
+ * pcie_dw_set_host_bars() - Configure the host BARs
+ *
+ * @regs_base: A pointer to the PCIe controller registers
+ *
+ * Configure the host BARs of the PCIe controller root port so that
+ * PCI(e) devices may access the system memory.
+ */
+static void pcie_dw_set_host_bars(const void *regs_base)
+{
+ u32 size = gd->ram_size;
+ u64 max_size;
+ u32 reg;
+ u32 bar0;
+
+ /* Verify the maximal BAR size */
+ reg = readl(regs_base + RESIZABLE_BAR_CAP);
+ max_size = 1ULL << (5 + (reg + (1 << 4)));
+
+ if (size > max_size) {
+ size = max_size;
+ printf("Warning: PCIe BARs can't map all DRAM space\n");
+ }
+
+ /* Set the BAR base and size towards DDR */
+ bar0 = CONFIG_SYS_SDRAM_BASE & ~0xf;
+ bar0 |= PCI_BASE_ADDRESS_MEM_TYPE_32;
+ writel(CONFIG_SYS_SDRAM_BASE, regs_base + PCIE_CONFIG_BAR0);
+
+ reg = ((size >> 20) - 1) << 12;
+ writel(size, regs_base + RESIZABLE_BAR_CTL0);
+}
+
+/**
+ * pcie_dw_mvebu_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_mvebu_probe(struct udevice *dev)
+{
+ struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
+ struct udevice *ctlr = pci_get_controller(dev);
+ struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+
+ pcie->first_busno = dev->seq;
+
+ /* Don't register host if link is down */
+ if (!pcie_dw_mvebu_pcie_link_up(pcie->ctrl_base, LINK_SPEED_GEN_3)) {
+ 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(pcie->ctrl_base),
+ pcie_dw_get_link_width(pcie->ctrl_base), hose->first_busno);
+
+ pcie_dw_regions_setup(pcie);
+
+ /* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
+ clrsetbits_le32(pcie->ctrl_base + PCI_CLASS_REVISION,
+ 0xffff << 16, PCI_CLASS_BRIDGE_PCI << 16);
+
+ pcie_dw_set_host_bars(pcie->ctrl_base);
+
+ return 0;
+}
+
+/**
+ * pcie_dw_mvebu_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_mvebu_ofdata_to_platdata(struct udevice *dev)
+{
+ struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
+
+ /* Get the controller base address */
+ pcie->ctrl_base = (void *)dev_get_addr_index(dev, 0);
+ if ((fdt_addr_t)pcie->ctrl_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ /* Get the config space base address and size */
+ pcie->cfg_base = (void *)dev_get_addr_size_index(dev, 1,
+ &pcie->cfg_size);
+ if ((fdt_addr_t)pcie->cfg_base == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct dm_pci_ops pcie_dw_mvebu_ops = {
+ .read_config = pcie_dw_mvebu_read_config,
+ .write_config = pcie_dw_mvebu_write_config,
+};
+
+static const struct udevice_id pcie_dw_mvebu_ids[] = {
+ { .compatible = "marvell,armada8k-pcie" },
+ { }
+};
+
+U_BOOT_DRIVER(pcie_dw_mvebu) = {
+ .name = "pcie_dw_mvebu",
+ .id = UCLASS_PCI,
+ .of_match = pcie_dw_mvebu_ids,
+ .ops = &pcie_dw_mvebu_ops,
+ .ofdata_to_platdata = pcie_dw_mvebu_ofdata_to_platdata,
+ .probe = pcie_dw_mvebu_probe,
+ .priv_auto_alloc_size = sizeof(struct pcie_dw_mvebu),
+};
projects / u-boot.git / commitdiff
