--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek PCIe host controller driver.
+ *
+ * Copyright (c) 2023 John Crispin <john@phrozen.org>
+ * Driver is based on u-boot gen1/2 and upstream linux gen3 code
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <log.h>
+#include <malloc.h>
+#include <pci.h>
+#include <reset.h>
+#include <asm/io.h>
+#include <dm/device_compat.h>
+#include <dm/devres.h>
+#include <linux/bitops.h>
+#include <linux/iopoll.h>
+#include <linux/list.h>
+#include "pci_internal.h"
+
+/* PCIe shared registers */
+#define PCIE_CFG_ADDR 0x20
+#define PCIE_CFG_DATA 0x24
+
+#define PCIE_SETTING_REG 0x80
+
+#define PCIE_PCI_IDS_1 0x9c
+#define PCIE_RC_MODE BIT(0)
+#define PCI_CLASS(class) ((class) << 8)
+
+#define PCIE_CFGNUM_REG 0x140
+#define PCIE_CFG_DEVFN(devfn) ((devfn) & GENMASK(7, 0))
+#define PCIE_CFG_BUS(bus) (((bus) << 8) & GENMASK(15, 8))
+#define PCIE_CFG_BYTE_EN(bytes) (((bytes) << 16) & GENMASK(19, 16))
+#define PCIE_CFG_FORCE_BYTE_EN BIT(20)
+#define PCIE_CFG_OFFSET_ADDR 0x1000
+#define PCIE_CFG_HEADER(bus, devfn) (PCIE_CFG_BUS(bus) | PCIE_CFG_DEVFN(devfn))
+
+#define PCIE_RST_CTRL_REG 0x148
+#define PCIE_MAC_RSTB BIT(0)
+#define PCIE_PHY_RSTB BIT(1)
+#define PCIE_BRG_RSTB BIT(2)
+#define PCIE_PE_RSTB BIT(3)
+
+#define PCIE_LINK_STATUS_REG 0x154
+#define PCIE_PORT_LINKUP BIT(8)
+
+#define PCIE_INT_ENABLE_REG 0x180
+
+#define PCIE_MISC_CTRL_REG 0x348
+#define PCIE_DISABLE_DVFSRC_VLT_REQ BIT(1)
+
+#define PCIE_TRANS_TABLE_BASE_REG 0x800
+#define PCIE_ATR_SRC_ADDR_MSB_OFFSET 0x4
+#define PCIE_ATR_TRSL_ADDR_LSB_OFFSET 0x8
+#define PCIE_ATR_TRSL_ADDR_MSB_OFFSET 0xc
+#define PCIE_ATR_TRSL_PARAM_OFFSET 0x10
+#define PCIE_ATR_TLB_SET_OFFSET 0x20
+
+#define PCIE_MAX_TRANS_TABLES 8
+#define PCIE_ATR_EN BIT(0)
+#define PCIE_ATR_SIZE(size) \
+ (((((size) - 1) << 1) & GENMASK(6, 1)) | PCIE_ATR_EN)
+#define PCIE_ATR_ID(id) ((id) & GENMASK(3, 0))
+#define PCIE_ATR_TYPE_MEM PCIE_ATR_ID(0)
+#define PCIE_ATR_TYPE_IO PCIE_ATR_ID(1)
+#define PCIE_ATR_TLP_TYPE(type) (((type) << 16) & GENMASK(18, 16))
+#define PCIE_ATR_TLP_TYPE_MEM PCIE_ATR_TLP_TYPE(0)
+#define PCIE_ATR_TLP_TYPE_IO PCIE_ATR_TLP_TYPE(2)
+
+struct mtk_pcie {
+ void __iomem *base;
+ void *priv;
+ struct clk pl_250m_ck;
+ struct clk tl_26m_ck;
+ struct clk peri_26m_ck;
+ struct clk top_133m_ck;
+ struct reset_ctl reset_phy;
+ struct reset_ctl reset_mac;
+ struct phy phy;
+};
+
+static void mtk_pcie_config_tlp_header(const struct udevice *bus,
+ pci_dev_t devfn,
+ int where, int size)
+{
+ struct mtk_pcie *pcie = dev_get_priv(bus);
+ int bytes;
+ u32 val;
+
+ size = 1 << size;
+ bytes = (GENMASK(size - 1, 0) & 0xf) << (where & 0x3);
+
+ val = PCIE_CFG_FORCE_BYTE_EN | PCIE_CFG_BYTE_EN(bytes) |
+ PCIE_CFG_HEADER(PCI_BUS(devfn), (devfn >> 8));
+
+ writel(val, pcie->base + PCIE_CFGNUM_REG);
+}
+
+static int mtk_pcie_config_address(const struct udevice *udev, pci_dev_t bdf,
+ uint offset, void **paddress)
+{
+ struct mtk_pcie *pcie = dev_get_priv(udev);
+
+ *paddress = pcie->base + PCIE_CFG_OFFSET_ADDR + offset;
+
+ return 0;
+}
+
+static int mtk_pcie_read_config(const struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong *valuep,
+ enum pci_size_t size)
+{
+ int ret;
+
+ mtk_pcie_config_tlp_header(bus, bdf, offset, size);
+ ret = pci_generic_mmap_read_config(bus, mtk_pcie_config_address,
+ bdf, offset, valuep, size);
+ return ret;
+}
+
+static int mtk_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
+ uint offset, ulong value,
+ enum pci_size_t size)
+{
+ mtk_pcie_config_tlp_header(bus, bdf, offset, size);
+
+ switch (size) {
+ case PCI_SIZE_8:
+ case PCI_SIZE_16:
+ value <<= (offset & 0x3) * 8;
+ case PCI_SIZE_32:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return pci_generic_mmap_write_config(bus, mtk_pcie_config_address,
+ bdf, (offset & ~0x3), value, PCI_SIZE_32);
+}
+
+static const struct dm_pci_ops mtk_pcie_ops = {
+ .read_config = mtk_pcie_read_config,
+ .write_config = mtk_pcie_write_config,
+};
+
+static int mtk_pcie_set_trans_table(struct udevice *dev, struct mtk_pcie *pcie,
+ u64 cpu_addr, u64 pci_addr, u64 size,
+ unsigned long type, int num)
+{
+ void __iomem *table;
+ u32 val;
+
+ if (num >= PCIE_MAX_TRANS_TABLES) {
+ dev_err(dev, "not enough translate table for addr: %#llx, limited to [%d]\n",
+ (unsigned long long)cpu_addr, PCIE_MAX_TRANS_TABLES);
+ return -ENODEV;
+ }
+
+ dev_dbg(dev, "set trans table %d: %#llx %#llx, %#llx\n", num, cpu_addr,
+ pci_addr, size);
+ table = pcie->base + PCIE_TRANS_TABLE_BASE_REG +
+ num * PCIE_ATR_TLB_SET_OFFSET;
+
+ writel(lower_32_bits(cpu_addr) | PCIE_ATR_SIZE(fls(size) - 1), table);
+ writel(upper_32_bits(cpu_addr), table + PCIE_ATR_SRC_ADDR_MSB_OFFSET);
+ writel(lower_32_bits(pci_addr), table + PCIE_ATR_TRSL_ADDR_LSB_OFFSET);
+ writel(upper_32_bits(pci_addr), table + PCIE_ATR_TRSL_ADDR_MSB_OFFSET);
+
+ if (type == PCI_REGION_IO)
+ val = PCIE_ATR_TYPE_IO | PCIE_ATR_TLP_TYPE_IO;
+ else
+ val = PCIE_ATR_TYPE_MEM | PCIE_ATR_TLP_TYPE_MEM;
+ writel(val, table + PCIE_ATR_TRSL_PARAM_OFFSET);
+
+ return 0;
+}
+
+static int mtk_pcie_startup_port(struct udevice *dev)
+{
+ struct mtk_pcie *pcie = dev_get_priv(dev);
+ struct udevice *ctlr = pci_get_controller(dev);
+ struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+ u32 val;
+ int i, err;
+
+ /* Set as RC mode */
+ val = readl(pcie->base + PCIE_SETTING_REG);
+ val |= PCIE_RC_MODE;
+ writel(val, pcie->base + PCIE_SETTING_REG);
+
+ /* setup RC BARs */
+ writel(PCI_BASE_ADDRESS_MEM_TYPE_64,
+ pcie->base + PCI_BASE_ADDRESS_0);
+ writel(0x0, pcie->base + PCI_BASE_ADDRESS_1);
+
+ /* setup interrupt pins */
+ clrsetbits_le32(pcie->base + PCI_INTERRUPT_LINE,
+ 0xff00, 0x100);
+
+ /* setup bus numbers */
+ clrsetbits_le32(pcie->base + PCI_PRIMARY_BUS,
+ 0xffffff, 0x00ff0100);
+
+ /* setup command register */
+ clrsetbits_le32(pcie->base + PCI_PRIMARY_BUS,
+ 0xffff,
+ PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+ PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
+
+ /* Set class code */
+ val = readl(pcie->base + PCIE_PCI_IDS_1);
+ val &= ~GENMASK(31, 8);
+ val |= PCI_CLASS(PCI_CLASS_BRIDGE_PCI << 8);
+ writel(val, pcie->base + PCIE_PCI_IDS_1);
+
+ /* Mask all INTx interrupts */
+ val = readl(pcie->base + PCIE_INT_ENABLE_REG);
+ val &= ~0xFF000000;
+ writel(val, pcie->base + PCIE_INT_ENABLE_REG);
+
+ /* Disable DVFSRC voltage request */
+ val = readl(pcie->base + PCIE_MISC_CTRL_REG);
+ val |= PCIE_DISABLE_DVFSRC_VLT_REQ;
+ writel(val, pcie->base + PCIE_MISC_CTRL_REG);
+
+ /* Assert all reset signals */
+ val = readl(pcie->base + PCIE_RST_CTRL_REG);
+ val |= PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB;
+ writel(val, pcie->base + PCIE_RST_CTRL_REG);
+
+ /*
+ * Described in PCIe CEM specification sections 2.2 (PERST# Signal)
+ * and 2.2.1 (Initial Power-Up (G3 to S0)).
+ * The deassertion of PERST# should be delayed 100ms (TPVPERL)
+ * for the power and clock to become stable.
+ */
+ mdelay(100);
+
+ /* De-assert reset signals */
+ val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB);
+ writel(val, pcie->base + PCIE_RST_CTRL_REG);
+
+ mdelay(100);
+
+ /* De-assert PERST# signals */
+ val &= ~(PCIE_PE_RSTB);
+ writel(val, pcie->base + PCIE_RST_CTRL_REG);
+
+ /* 100ms timeout value should be enough for Gen1/2 training */
+ err = readl_poll_timeout(pcie->base + PCIE_LINK_STATUS_REG, val,
+ !!(val & PCIE_PORT_LINKUP),
+ 100 * 1000);
+ if (err) {
+ dev_dbg(dev, "no card detected\n");
+ return -ETIMEDOUT;
+ }
+ dev_dbg(dev, "detected a card\n");
+
+ for (i = 0; i < hose->region_count; i++) {
+ struct pci_region *reg = &hose->regions[i];
+
+ if (reg->flags != PCI_REGION_MEM)
+ continue;
+
+ mtk_pcie_set_trans_table(dev, pcie, reg->bus_start, reg->phys_start,
+ reg->size, reg->flags, 0);
+ }
+
+ return 0;
+}
+
+static int mtk_pcie_power_on(struct udevice *dev)
+{
+ struct mtk_pcie *pcie = dev_get_priv(dev);
+ int err;
+
+ pcie->base = dev_remap_addr_name(dev, "pcie-mac");
+ if (!pcie->base)
+ return -ENOENT;
+
+ pcie->priv = dev;
+
+ err = generic_phy_get_by_name(dev, "pcie-phy", &pcie->phy);
+ if (err)
+ return err;
+
+ /*
+ * Upstream linux kernel devine these clock without clock-names
+ * and use clk bulk API to enable them all.
+ */
+ err = clk_get_by_index(dev, 0, &pcie->pl_250m_ck);
+ if (err)
+ return err;
+
+ err = clk_get_by_index(dev, 1, &pcie->tl_26m_ck);
+ if (err)
+ return err;
+
+ err = clk_get_by_index(dev, 2, &pcie->peri_26m_ck);
+ if (err)
+ return err;
+
+ err = clk_get_by_index(dev, 3, &pcie->top_133m_ck);
+ if (err)
+ return err;
+
+ err = generic_phy_init(&pcie->phy);
+ if (err)
+ return err;
+
+ err = generic_phy_power_on(&pcie->phy);
+ if (err)
+ goto err_phy_on;
+
+ err = clk_enable(&pcie->pl_250m_ck);
+ if (err)
+ goto err_clk_pl_250m;
+
+ err = clk_enable(&pcie->tl_26m_ck);
+ if (err)
+ goto err_clk_tl_26m;
+
+ err = clk_enable(&pcie->peri_26m_ck);
+ if (err)
+ goto err_clk_peri_26m;
+
+ err = clk_enable(&pcie->top_133m_ck);
+ if (err)
+ goto err_clk_top_133m;
+
+ err = mtk_pcie_startup_port(dev);
+ if (err)
+ goto err_startup;
+
+ return 0;
+
+err_startup:
+err_clk_top_133m:
+ clk_disable(&pcie->top_133m_ck);
+err_clk_peri_26m:
+ clk_disable(&pcie->peri_26m_ck);
+err_clk_tl_26m:
+ clk_disable(&pcie->tl_26m_ck);
+err_clk_pl_250m:
+ clk_disable(&pcie->pl_250m_ck);
+err_phy_on:
+ generic_phy_exit(&pcie->phy);
+
+ return err;
+}
+
+static int mtk_pcie_probe(struct udevice *dev)
+{
+ struct mtk_pcie *pcie = dev_get_priv(dev);
+ int err;
+
+ pcie->priv = dev;
+
+ err = mtk_pcie_power_on(dev);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static const struct udevice_id mtk_pcie_ids[] = {
+ { .compatible = "mediatek,mt8192-pcie" },
+ { }
+};
+
+U_BOOT_DRIVER(pcie_mediatek_gen3) = {
+ .name = "pcie_mediatek_gen3",
+ .id = UCLASS_PCI,
+ .of_match = mtk_pcie_ids,
+ .ops = &mtk_pcie_ops,
+ .probe = mtk_pcie_probe,
+ .priv_auto = sizeof(struct mtk_pcie),
+};
projects / u-boot.git / commitdiff
