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- diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
- index 3fe38f7315..6f19471ae7 100644
- --- a/drivers/pci/Kconfig
- +++ b/drivers/pci/Kconfig
- @@ -145,4 +145,12 @@ config PCI_MVEBU
- Say Y here if you want to enable PCIe controller support on
- Armada XP/38x SoCs.
- +config PCIE_MEDIATEK
- + bool "MediaTek PCIe controller"
- + depends on DM_PCI
- + depends on ARCH_MEDIATEK
- + help
- + Say Y here if you want to enable PCIe controller support on
- + MediaTek SoCs.
- +
- endif
- diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
- index b5ebd50c85..7093d63918 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_PCIE_MEDIATEK) += pcie_mediatek.o
- diff --git a/drivers/pci/pcie_mediatek.c b/drivers/pci/pcie_mediatek.c
- new file mode 100644
- index 0000000000..1dc8b35232
- --- /dev/null
- +++ b/drivers/pci/pcie_mediatek.c
- @@ -0,0 +1,298 @@
- +// SPDX-License-Identifier: GPL-2.0
- +/*
- + * Copyright (c) 2019 MediaTek Inc.
- + *
- + * Author: Ryder Lee <ryder.lee@mediatek.com>
- + */
- +
- +#include <common.h>
- +#include <clk.h>
- +#include <dm.h>
- +#include <generic-phy.h>
- +#include <pci.h>
- +#include <reset.h>
- +#include <asm/io.h>
- +#include <linux/iopoll.h>
- +#include <linux/list.h>
- +
- +/* PCIe shared registers */
- +#define PCIE_SYS_CFG 0x00
- +#define PCIE_INT_ENABLE 0x0c
- +#define PCIE_CFG_ADDR 0x20
- +#define PCIE_CFG_DATA 0x24
- +
- +/* PCIe per port registers */
- +#define PCIE_BAR0_SETUP 0x10
- +#define PCIE_CLASS 0x34
- +#define PCIE_LINK_STATUS 0x50
- +
- +#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
- +#define PCIE_PORT_PERST(x) BIT(1 + (x))
- +#define PCIE_PORT_LINKUP BIT(0)
- +#define PCIE_BAR_MAP_MAX GENMASK(31, 16)
- +
- +#define PCIE_BAR_ENABLE BIT(0)
- +#define PCIE_REVISION_ID BIT(0)
- +#define PCIE_CLASS_CODE (0x60400 << 8)
- +#define PCIE_CONF_REG(regn) (((regn) & GENMASK(7, 2)) | \
- + ((((regn) >> 8) & GENMASK(3, 0)) << 24))
- +#define PCIE_CONF_FUN(fun) (((fun) << 8) & GENMASK(10, 8))
- +#define PCIE_CONF_DEV(dev) (((dev) << 11) & GENMASK(15, 11))
- +#define PCIE_CONF_BUS(bus) (((bus) << 16) & GENMASK(23, 16))
- +#define PCIE_CONF_ADDR(regn, fun, dev, bus) \
- + (PCIE_CONF_REG(regn) | PCIE_CONF_FUN(fun) | \
- + PCIE_CONF_DEV(dev) | PCIE_CONF_BUS(bus))
- +
- +/* MediaTek specific configuration registers */
- +#define PCIE_FTS_NUM 0x70c
- +#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
- +#define PCIE_FTS_NUM_L0(x) ((x) & 0xff << 8)
- +
- +#define PCIE_FC_CREDIT 0x73c
- +#define PCIE_FC_CREDIT_MASK (GENMASK(31, 31) | GENMASK(28, 16))
- +#define PCIE_FC_CREDIT_VAL(x) ((x) << 16)
- +
- +struct mtk_pcie_port {
- + void __iomem *base;
- + struct list_head list;
- + struct mtk_pcie *pcie;
- + struct reset_ctl reset;
- + struct clk sys_ck;
- + struct phy phy;
- + u32 slot;
- +};
- +
- +struct mtk_pcie {
- + void __iomem *base;
- + struct clk free_ck;
- + struct list_head ports;
- +};
- +
- +static int mtk_pcie_config_address(struct udevice *udev, pci_dev_t bdf,
- + uint offset, void **paddress)
- +{
- + struct mtk_pcie *pcie = dev_get_priv(udev);
- +
- + writel(PCIE_CONF_ADDR(offset, PCI_FUNC(bdf), PCI_DEV(bdf),
- + PCI_BUS(bdf)), pcie->base + PCIE_CFG_ADDR);
- + *paddress = pcie->base + PCIE_CFG_DATA + (offset & 3);
- +
- + return 0;
- +}
- +
- +static int mtk_pcie_read_config(struct udevice *bus, pci_dev_t bdf,
- + uint offset, ulong *valuep,
- + enum pci_size_t size)
- +{
- + return pci_generic_mmap_read_config(bus, mtk_pcie_config_address,
- + bdf, offset, valuep, size);
- +}
- +
- +static int mtk_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
- + uint offset, ulong value,
- + enum pci_size_t size)
- +{
- + return pci_generic_mmap_write_config(bus, mtk_pcie_config_address,
- + bdf, offset, value, size);
- +}
- +
- +static const struct dm_pci_ops mtk_pcie_ops = {
- + .read_config = mtk_pcie_read_config,
- + .write_config = mtk_pcie_write_config,
- +};
- +
- +static void mtk_pcie_port_free(struct mtk_pcie_port *port)
- +{
- + list_del(&port->list);
- + free(port);
- +}
- +
- +static int mtk_pcie_startup_port(struct mtk_pcie_port *port)
- +{
- + struct mtk_pcie *pcie = port->pcie;
- + u32 func = PCI_FUNC(port->slot << 11);
- + u32 slot = PCI_DEV(port->slot << 11);
- + u32 val;
- + int err;
- +
- + /* assert port PERST_N */
- + val = readl(pcie->base + PCIE_SYS_CFG);
- + val |= PCIE_PORT_PERST(port->slot);
- + writel(val, pcie->base + PCIE_SYS_CFG);
- +
- + /* de-assert port PERST_N */
- + val = readl(pcie->base + PCIE_SYS_CFG);
- + val &= ~PCIE_PORT_PERST(port->slot);
- + writel(val, pcie->base + PCIE_SYS_CFG);
- +
- + /* 100ms timeout value should be enough for Gen1/2 training */
- + err = readl_poll_timeout(port->base + PCIE_LINK_STATUS, val,
- + !!(val & PCIE_PORT_LINKUP), 100000);
- + if (err)
- + return -ETIMEDOUT;
- +
- + /* enable interrupt */
- + val = readl(pcie->base + PCIE_INT_ENABLE);
- + val |= PCIE_PORT_INT_EN(port->slot);
- + writel(val, pcie->base + PCIE_INT_ENABLE);
- +
- + /* map to all DDR region. We need to set it before cfg operation. */
- + writel(PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
- + port->base + PCIE_BAR0_SETUP);
- +
- + /* configure class code and revision ID */
- + writel(PCIE_CLASS_CODE | PCIE_REVISION_ID, port->base + PCIE_CLASS);
- +
- + /* configure FC credit */
- + writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
- + pcie->base + PCIE_CFG_ADDR);
- + val = readl(pcie->base + PCIE_CFG_DATA);
- + val &= ~PCIE_FC_CREDIT_MASK;
- + val |= PCIE_FC_CREDIT_VAL(0x806c);
- + writel(PCIE_CONF_ADDR(PCIE_FC_CREDIT, func, slot, 0),
- + pcie->base + PCIE_CFG_ADDR);
- + writel(val, pcie->base + PCIE_CFG_DATA);
- +
- + /* configure RC FTS number to 250 when it leaves L0s */
- + writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
- + pcie->base + PCIE_CFG_ADDR);
- + val = readl(pcie->base + PCIE_CFG_DATA);
- + val &= ~PCIE_FTS_NUM_MASK;
- + val |= PCIE_FTS_NUM_L0(0x50);
- + writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, func, slot, 0),
- + pcie->base + PCIE_CFG_ADDR);
- + writel(val, pcie->base + PCIE_CFG_DATA);
- +
- + return 0;
- +}
- +
- +static void mtk_pcie_enable_port(struct mtk_pcie_port *port)
- +{
- + int err;
- +
- + err = clk_enable(&port->sys_ck);
- + if (err)
- + goto exit;
- +
- + err = reset_assert(&port->reset);
- + if (err)
- + goto exit;
- +
- + err = reset_deassert(&port->reset);
- + if (err)
- + goto exit;
- +
- + err = generic_phy_init(&port->phy);
- + if (err)
- + goto exit;
- +
- + err = generic_phy_power_on(&port->phy);
- + if (err)
- + goto exit;
- +
- + if (!mtk_pcie_startup_port(port))
- + return;
- +
- + pr_err("Port%d link down\n", port->slot);
- +exit:
- + mtk_pcie_port_free(port);
- +}
- +
- +static int mtk_pcie_parse_port(struct udevice *dev, u32 slot)
- +{
- + struct mtk_pcie *pcie = dev_get_priv(dev);
- + struct mtk_pcie_port *port;
- + char name[10];
- + int err;
- +
- + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
- + if (!port)
- + return -ENOMEM;
- +
- + snprintf(name, sizeof(name), "port%d", slot);
- + port->base = dev_remap_addr_name(dev, name);
- + if (!port->base)
- + return -ENOENT;
- +
- + snprintf(name, sizeof(name), "sys_ck%d", slot);
- + err = clk_get_by_name(dev, name, &port->sys_ck);
- + if (err)
- + return err;
- +
- + err = reset_get_by_index(dev, slot, &port->reset);
- + if (err)
- + return err;
- +
- + err = generic_phy_get_by_index(dev, slot, &port->phy);
- + if (err)
- + return err;
- +
- + port->slot = slot;
- + port->pcie = pcie;
- +
- + INIT_LIST_HEAD(&port->list);
- + list_add_tail(&port->list, &pcie->ports);
- +
- + return 0;
- +}
- +
- +static int mtk_pcie_probe(struct udevice *dev)
- +{
- + struct mtk_pcie *pcie = dev_get_priv(dev);
- + struct mtk_pcie_port *port, *tmp;
- + ofnode subnode;
- + int err;
- +
- + INIT_LIST_HEAD(&pcie->ports);
- +
- + pcie->base = dev_remap_addr_name(dev, "subsys");
- + if (!pcie->base)
- + return -ENOENT;
- +
- + err = clk_get_by_name(dev, "free_ck", &pcie->free_ck);
- + if (err)
- + return err;
- +
- + /* enable top level clock */
- + err = clk_enable(&pcie->free_ck);
- + if (err)
- + return err;
- +
- + dev_for_each_subnode(subnode, dev) {
- + struct fdt_pci_addr addr;
- + u32 slot = 0;
- +
- + if (!ofnode_is_available(subnode))
- + continue;
- +
- + err = ofnode_read_pci_addr(subnode, 0, "reg", &addr);
- + if (err)
- + return err;
- +
- + slot = PCI_DEV(addr.phys_hi);
- +
- + err = mtk_pcie_parse_port(dev, slot);
- + if (err)
- + return err;
- + }
- +
- + /* enable each port, and then check link status */
- + list_for_each_entry_safe(port, tmp, &pcie->ports, list)
- + mtk_pcie_enable_port(port);
- +
- + return 0;
- +}
- +
- +static const struct udevice_id mtk_pcie_ids[] = {
- + { .compatible = "mediatek,mt7623-pcie", },
- + { }
- +};
- +
- +U_BOOT_DRIVER(pcie_mediatek) = {
- + .name = "pcie_mediatek",
- + .id = UCLASS_PCI,
- + .of_match = mtk_pcie_ids,
- + .ops = &mtk_pcie_ops,
- + .probe = mtk_pcie_probe,
- + .priv_auto_alloc_size = sizeof(struct mtk_pcie),
- +};
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