--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * pcie_uniphier.c - Socionext UniPhier PCIe driver
+ * Copyright 2019-2021 Socionext, Inc.
+ */
+
+#include <clk.h>
+#include <common.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <generic-phy.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/compat.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <pci.h>
+#include <reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* DBI registers */
+#define PCIE_LINK_STATUS_REG 0x0080
+#define PCIE_LINK_STATUS_WIDTH_MASK GENMASK(25, 20)
+#define PCIE_LINK_STATUS_SPEED_MASK GENMASK(19, 16)
+
+#define PCIE_MISC_CONTROL_1_OFF 0x08BC
+#define PCIE_DBI_RO_WR_EN BIT(0)
+
+/* DBI iATU registers */
+#define PCIE_ATU_VIEWPORT 0x0900
+#define PCIE_ATU_REGION_INBOUND BIT(31)
+#define PCIE_ATU_REGION_OUTBOUND 0
+#define PCIE_ATU_REGION_INDEX_MASK GENMASK(3, 0)
+
+#define PCIE_ATU_CR1 0x0904
+#define PCIE_ATU_TYPE_MEM 0
+#define PCIE_ATU_TYPE_IO 2
+#define PCIE_ATU_TYPE_CFG0 4
+#define PCIE_ATU_TYPE_CFG1 5
+
+#define PCIE_ATU_CR2 0x0908
+#define PCIE_ATU_ENABLE BIT(31)
+#define PCIE_ATU_MATCH_MODE BIT(30)
+#define PCIE_ATU_BAR_NUM_MASK GENMASK(10, 8)
+
+#define PCIE_ATU_LOWER_BASE 0x090C
+#define PCIE_ATU_UPPER_BASE 0x0910
+#define PCIE_ATU_LIMIT 0x0914
+#define PCIE_ATU_LOWER_TARGET 0x0918
+#define PCIE_ATU_BUS(x) FIELD_PREP(GENMASK(31, 24), x)
+#define PCIE_ATU_DEV(x) FIELD_PREP(GENMASK(23, 19), x)
+#define PCIE_ATU_FUNC(x) FIELD_PREP(GENMASK(18, 16), x)
+#define PCIE_ATU_UPPER_TARGET 0x091C
+
+/* Link Glue registers */
+#define PCL_PINCTRL0 0x002c
+#define PCL_PERST_PLDN_REGEN BIT(12)
+#define PCL_PERST_NOE_REGEN BIT(11)
+#define PCL_PERST_OUT_REGEN BIT(8)
+#define PCL_PERST_PLDN_REGVAL BIT(4)
+#define PCL_PERST_NOE_REGVAL BIT(3)
+#define PCL_PERST_OUT_REGVAL BIT(0)
+
+#define PCL_MODE 0x8000
+#define PCL_MODE_REGEN BIT(8)
+#define PCL_MODE_REGVAL BIT(0)
+
+#define PCL_APP_READY_CTRL 0x8008
+#define PCL_APP_LTSSM_ENABLE BIT(0)
+
+#define PCL_APP_PM0 0x8078
+#define PCL_SYS_AUX_PWR_DET BIT(8)
+
+#define PCL_STATUS_LINK 0x8140
+#define PCL_RDLH_LINK_UP BIT(1)
+#define PCL_XMLH_LINK_UP BIT(0)
+
+#define LINK_UP_TIMEOUT_MS 100
+
+struct uniphier_pcie_priv {
+ void *base;
+ void *dbi_base;
+ void *cfg_base;
+ fdt_size_t cfg_size;
+ struct fdt_resource link_res;
+ struct fdt_resource dbi_res;
+ struct fdt_resource cfg_res;
+
+ struct clk clk;
+ struct reset_ctl rst;
+ struct phy phy;
+
+ struct pci_region io;
+ struct pci_region mem;
+};
+
+static int pcie_dw_get_link_speed(struct uniphier_pcie_priv *priv)
+{
+ u32 val = readl(priv->dbi_base + PCIE_LINK_STATUS_REG);
+
+ return FIELD_GET(PCIE_LINK_STATUS_SPEED_MASK, val);
+}
+
+static int pcie_dw_get_link_width(struct uniphier_pcie_priv *priv)
+{
+ u32 val = readl(priv->dbi_base + PCIE_LINK_STATUS_REG);
+
+ return FIELD_GET(PCIE_LINK_STATUS_WIDTH_MASK, val);
+}
+
+static void pcie_dw_prog_outbound_atu(struct uniphier_pcie_priv *priv,
+ int index, int type, u64 cpu_addr,
+ u64 pci_addr, u32 size)
+{
+ writel(PCIE_ATU_REGION_OUTBOUND
+ | FIELD_PREP(PCIE_ATU_REGION_INDEX_MASK, index),
+ priv->dbi_base + PCIE_ATU_VIEWPORT);
+ writel(lower_32_bits(cpu_addr),
+ priv->dbi_base + PCIE_ATU_LOWER_BASE);
+ writel(upper_32_bits(cpu_addr),
+ priv->dbi_base + PCIE_ATU_UPPER_BASE);
+ writel(lower_32_bits(cpu_addr + size - 1),
+ priv->dbi_base + PCIE_ATU_LIMIT);
+ writel(lower_32_bits(pci_addr),
+ priv->dbi_base + PCIE_ATU_LOWER_TARGET);
+ writel(upper_32_bits(pci_addr),
+ priv->dbi_base + PCIE_ATU_UPPER_TARGET);
+
+ writel(type, priv->dbi_base + PCIE_ATU_CR1);
+ writel(PCIE_ATU_ENABLE, priv->dbi_base + PCIE_ATU_CR2);
+}
+
+static int uniphier_pcie_addr_valid(pci_dev_t bdf, int first_busno)
+{
+ /* accept only device {0,1} on first bus */
+ if ((PCI_BUS(bdf) != first_busno) || (PCI_DEV(bdf) > 1))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int uniphier_pcie_conf_address(const struct udevice *dev, pci_dev_t bdf,
+ uint offset, void **paddr)
+{
+ struct uniphier_pcie_priv *priv = dev_get_priv(dev);
+ u32 busdev;
+ int seq = dev_seq(dev);
+ int ret;
+
+ ret = uniphier_pcie_addr_valid(bdf, seq);
+ if (ret)
+ return ret;
+
+ if ((PCI_BUS(bdf) == seq) && !PCI_DEV(bdf)) {
+ *paddr = (void *)(priv->dbi_base + offset);
+ return 0;
+ }
+
+ busdev = PCIE_ATU_BUS(PCI_BUS(bdf) - seq)
+ | PCIE_ATU_DEV(PCI_DEV(bdf))
+ | PCIE_ATU_FUNC(PCI_FUNC(bdf));
+
+ pcie_dw_prog_outbound_atu(priv, 0,
+ PCIE_ATU_TYPE_CFG0, (u64)priv->cfg_base,
+ busdev, priv->cfg_size);
+ *paddr = (void *)(priv->cfg_base + offset);
+
+ return 0;
+}
+
+static int uniphier_pcie_read_config(const struct udevice *dev, pci_dev_t bdf,
+ uint offset, ulong *valp,
+ enum pci_size_t size)
+{
+ return pci_generic_mmap_read_config(dev, uniphier_pcie_conf_address,
+ bdf, offset, valp, size);
+}
+
+static int uniphier_pcie_write_config(struct udevice *dev, pci_dev_t bdf,
+ uint offset, ulong val,
+ enum pci_size_t size)
+{
+ return pci_generic_mmap_write_config(dev, uniphier_pcie_conf_address,
+ bdf, offset, val, size);
+}
+
+static void uniphier_pcie_ltssm_enable(struct uniphier_pcie_priv *priv,
+ bool enable)
+{
+ u32 val;
+
+ val = readl(priv->base + PCL_APP_READY_CTRL);
+ if (enable)
+ val |= PCL_APP_LTSSM_ENABLE;
+ else
+ val &= ~PCL_APP_LTSSM_ENABLE;
+ writel(val, priv->base + PCL_APP_READY_CTRL);
+}
+
+static int uniphier_pcie_link_up(struct uniphier_pcie_priv *priv)
+{
+ u32 val, mask;
+
+ val = readl(priv->base + PCL_STATUS_LINK);
+ mask = PCL_RDLH_LINK_UP | PCL_XMLH_LINK_UP;
+
+ return (val & mask) == mask;
+}
+
+static int uniphier_pcie_wait_link(struct uniphier_pcie_priv *priv)
+{
+ unsigned long timeout;
+
+ timeout = get_timer(0) + LINK_UP_TIMEOUT_MS;
+
+ while (get_timer(0) < timeout) {
+ if (uniphier_pcie_link_up(priv))
+ return 0;
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int uniphier_pcie_establish_link(struct uniphier_pcie_priv *priv)
+{
+ if (uniphier_pcie_link_up(priv))
+ return 0;
+
+ uniphier_pcie_ltssm_enable(priv, true);
+
+ return uniphier_pcie_wait_link(priv);
+}
+
+static void uniphier_pcie_init_rc(struct uniphier_pcie_priv *priv)
+{
+ u32 val;
+
+ /* set RC mode */
+ val = readl(priv->base + PCL_MODE);
+ val |= PCL_MODE_REGEN;
+ val &= ~PCL_MODE_REGVAL;
+ writel(val, priv->base + PCL_MODE);
+
+ /* use auxiliary power detection */
+ val = readl(priv->base + PCL_APP_PM0);
+ val |= PCL_SYS_AUX_PWR_DET;
+ writel(val, priv->base + PCL_APP_PM0);
+
+ /* assert PERST# */
+ val = readl(priv->base + PCL_PINCTRL0);
+ val &= ~(PCL_PERST_NOE_REGVAL | PCL_PERST_OUT_REGVAL
+ | PCL_PERST_PLDN_REGVAL);
+ val |= PCL_PERST_NOE_REGEN | PCL_PERST_OUT_REGEN
+ | PCL_PERST_PLDN_REGEN;
+ writel(val, priv->base + PCL_PINCTRL0);
+
+ uniphier_pcie_ltssm_enable(priv, false);
+
+ mdelay(100);
+
+ /* deassert PERST# */
+ val = readl(priv->base + PCL_PINCTRL0);
+ val |= PCL_PERST_OUT_REGVAL | PCL_PERST_OUT_REGEN;
+ writel(val, priv->base + PCL_PINCTRL0);
+}
+
+static void uniphier_pcie_setup_rc(struct uniphier_pcie_priv *priv,
+ struct pci_controller *hose)
+{
+ /* Store the IO and MEM windows settings for future use by the ATU */
+ priv->io.phys_start = hose->regions[0].phys_start; /* IO base */
+ priv->io.bus_start = hose->regions[0].bus_start; /* IO_bus_addr */
+ priv->io.size = hose->regions[0].size; /* IO size */
+ priv->mem.phys_start = hose->regions[1].phys_start; /* MEM base */
+ priv->mem.bus_start = hose->regions[1].bus_start; /* MEM_bus_addr */
+ priv->mem.size = hose->regions[1].size; /* MEM size */
+
+ /* outbound: IO */
+ pcie_dw_prog_outbound_atu(priv, 0,
+ PCIE_ATU_TYPE_IO, priv->io.phys_start,
+ priv->io.bus_start, priv->io.size);
+
+ /* outbound: MEM */
+ pcie_dw_prog_outbound_atu(priv, 1,
+ PCIE_ATU_TYPE_MEM, priv->mem.phys_start,
+ priv->mem.bus_start, priv->mem.size);
+}
+
+static int uniphier_pcie_probe(struct udevice *dev)
+{
+ struct uniphier_pcie_priv *priv = dev_get_priv(dev);
+ struct udevice *ctlr = pci_get_controller(dev);
+ struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+ int ret;
+
+ priv->base = map_physmem(priv->link_res.start,
+ fdt_resource_size(&priv->link_res),
+ MAP_NOCACHE);
+ priv->dbi_base = map_physmem(priv->dbi_res.start,
+ fdt_resource_size(&priv->dbi_res),
+ MAP_NOCACHE);
+ priv->cfg_size = fdt_resource_size(&priv->cfg_res);
+ priv->cfg_base = map_physmem(priv->cfg_res.start,
+ priv->cfg_size, MAP_NOCACHE);
+
+ ret = clk_enable(&priv->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable clk: %d\n", ret);
+ return ret;
+ }
+ ret = reset_deassert(&priv->rst);
+ if (ret) {
+ dev_err(dev, "Failed to deassert reset: %d\n", ret);
+ goto out_clk_release;
+ }
+
+ ret = generic_phy_init(&priv->phy);
+ if (ret) {
+ dev_err(dev, "Failed to initialize phy: %d\n", ret);
+ goto out_reset_release;
+ }
+
+ ret = generic_phy_power_on(&priv->phy);
+ if (ret) {
+ dev_err(dev, "Failed to power on phy: %d\n", ret);
+ goto out_phy_exit;
+ }
+
+ uniphier_pcie_init_rc(priv);
+
+ /* set DBI to read only */
+ writel(0, priv->dbi_base + PCIE_MISC_CONTROL_1_OFF);
+
+ uniphier_pcie_setup_rc(priv, hose);
+
+ if (uniphier_pcie_establish_link(priv)) {
+ printf("PCIE-%d: Link down\n", dev_seq(dev));
+ } else {
+ printf("PCIE-%d: Link up (Gen%d-x%d, Bus%d)\n",
+ dev_seq(dev), pcie_dw_get_link_speed(priv),
+ pcie_dw_get_link_width(priv), hose->first_busno);
+ }
+
+ return 0;
+
+out_phy_exit:
+ generic_phy_exit(&priv->phy);
+out_reset_release:
+ reset_release_all(&priv->rst, 1);
+out_clk_release:
+ clk_release_all(&priv->clk, 1);
+
+ return ret;
+}
+
+static int uniphier_pcie_of_to_plat(struct udevice *dev)
+{
+ struct uniphier_pcie_priv *priv = dev_get_priv(dev);
+ const void *fdt = gd->fdt_blob;
+ int node = dev_of_offset(dev);
+ int ret;
+
+ ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+ "link", &priv->link_res);
+ if (ret) {
+ dev_err(dev, "Failed to get link regs: %d\n", ret);
+ return ret;
+ }
+
+ ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+ "dbi", &priv->dbi_res);
+ if (ret) {
+ dev_err(dev, "Failed to get dbi regs: %d\n", ret);
+ return ret;
+ }
+
+ ret = fdt_get_named_resource(fdt, node, "reg", "reg-names",
+ "config", &priv->cfg_res);
+ if (ret) {
+ dev_err(dev, "Failed to get config regs: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_get_by_index(dev, 0, &priv->clk);
+ if (ret) {
+ dev_err(dev, "Failed to get clocks property: %d\n", ret);
+ return ret;
+ }
+
+ ret = reset_get_by_index(dev, 0, &priv->rst);
+ if (ret) {
+ dev_err(dev, "Failed to get resets property: %d\n", ret);
+ return ret;
+ }
+
+ ret = generic_phy_get_by_index(dev, 0, &priv->phy);
+ if (ret) {
+ dev_err(dev, "Failed to get phy property: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct dm_pci_ops uniphier_pcie_ops = {
+ .read_config = uniphier_pcie_read_config,
+ .write_config = uniphier_pcie_write_config,
+};
+
+static const struct udevice_id uniphier_pcie_ids[] = {
+ { .compatible = "socionext,uniphier-pcie", },
+ { /* Sentinel */ }
+};
+
+U_BOOT_DRIVER(pcie_uniphier) = {
+ .name = "uniphier-pcie",
+ .id = UCLASS_PCI,
+ .of_match = uniphier_pcie_ids,
+ .probe = uniphier_pcie_probe,
+ .ops = &uniphier_pcie_ops,
+ .of_to_plat = uniphier_pcie_of_to_plat,
+ .priv_auto = sizeof(struct uniphier_pcie_priv),
+};
projects / u-boot.git / commitdiff
