From 42d37450e50b3a763d95fe1ff46499b9e564596e Mon Sep 17 00:00:00 2001 From: Ryder Lee Date: Thu, 22 Aug 2019 12:26:49 +0200 Subject: [PATCH] pci: mediatek: add PCIe controller support for MT7623 This adds PCIe controller support for MT7623. This is adapted from the Linux version. Tested-by: Frank Wunderlich Signed-off-by: Ryder Lee Signed-off-by: Frank Wunderlich --- drivers/pci/Kconfig | 8 ++ drivers/pci/Makefile | 1 + drivers/pci/pcie_mediatek.c | 279 ++++++++++++++++++++++++++++++++++++ 3 files changed, 288 insertions(+) create mode 100644 drivers/pci/pcie_mediatek.c diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index bdfc0c1796..19e7b50046 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -151,4 +151,12 @@ config PCI_KEYSTONE help Say Y here if you want to enable PCI controller support on AM654 SoC. +config PCIE_MEDIATEK + bool "MediaTek PCIe Gen2 controller" + depends on DM_PCI + depends on ARCH_MEDIATEK + help + Say Y here if you want to enable Gen2 PCIe controller, + which could be found on MT7623 SoC family. + endif diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index e54a98b8c9..b1d3dc8610 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie_layerscape_gen4.o \ obj-$(CONFIG_PCI_XILINX) += pcie_xilinx.o obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o obj-$(CONFIG_PCI_KEYSTONE) += pcie_dw_ti.o +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..a0dcb258b0 --- /dev/null +++ b/drivers/pci/pcie_mediatek.c @@ -0,0 +1,279 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MediaTek PCIe host controller driver. + * + * Copyright (c) 2017-2019 MediaTek Inc. + * Author: Ryder Lee + * Honghui Zhang + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 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_ADDR(regn, bdf) \ + (PCIE_CONF_REG(regn) | (bdf)) + +/* 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, 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 slot = PCI_DEV(port->slot << 11); + u32 val; + int err; + + /* assert port PERST_N */ + setbits_le32(pcie->base + PCIE_SYS_CFG, PCIE_PORT_PERST(port->slot)); + /* de-assert port PERST_N */ + clrbits_le32(pcie->base + PCIE_SYS_CFG, PCIE_PORT_PERST(port->slot)); + + /* 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; + + /* disable interrupt */ + clrbits_le32(pcie->base + PCIE_INT_ENABLE, + PCIE_PORT_INT_EN(port->slot)); + + /* 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, slot), + pcie->base + PCIE_CFG_ADDR); + clrsetbits_le32(pcie->base + PCIE_CFG_DATA, PCIE_FC_CREDIT_MASK, + PCIE_FC_CREDIT_VAL(0x806c)); + + /* configure RC FTS number to 250 when it leaves L0s */ + writel(PCIE_CONF_ADDR(PCIE_FTS_NUM, slot), pcie->base + PCIE_CFG_ADDR); + clrsetbits_le32(pcie->base + PCIE_CFG_DATA, PCIE_FTS_NUM_MASK, + PCIE_FTS_NUM_L0(0x50)); + + 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), +}; -- 2.25.1