| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * PCIe host controller driver for Kirin Phone SoCs |
| * |
| * Copyright (C) 2017 HiSilicon Electronics Co., Ltd. |
| * http://www.huawei.com |
| * |
| * Author: Xiaowei Song <songxiaowei@huawei.com> |
| */ |
| |
| #include <linux/compiler.h> |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/gpio.h> |
| #include <linux/interrupt.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/of_address.h> |
| #include <linux/of_gpio.h> |
| #include <linux/of_pci.h> |
| #include <linux/pci.h> |
| #include <linux/pci_regs.h> |
| #include <linux/platform_device.h> |
| #include <linux/regmap.h> |
| #include <linux/resource.h> |
| #include <linux/types.h> |
| #include "pcie-designware.h" |
| |
| #define to_kirin_pcie(x) dev_get_drvdata((x)->dev) |
| |
| #define REF_CLK_FREQ 100000000 |
| |
| /* PCIe ELBI registers */ |
| #define SOC_PCIECTRL_CTRL0_ADDR 0x000 |
| #define SOC_PCIECTRL_CTRL1_ADDR 0x004 |
| #define SOC_PCIEPHY_CTRL2_ADDR 0x008 |
| #define SOC_PCIEPHY_CTRL3_ADDR 0x00c |
| #define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21) |
| |
| /* info located in APB */ |
| #define PCIE_APP_LTSSM_ENABLE 0x01c |
| #define PCIE_APB_PHY_CTRL0 0x0 |
| #define PCIE_APB_PHY_CTRL1 0x4 |
| #define PCIE_APB_PHY_STATUS0 0x400 |
| #define PCIE_LINKUP_ENABLE (0x8020) |
| #define PCIE_LTSSM_ENABLE_BIT (0x1 << 11) |
| #define PIPE_CLK_STABLE (0x1 << 19) |
| #define PHY_REF_PAD_BIT (0x1 << 8) |
| #define PHY_PWR_DOWN_BIT (0x1 << 22) |
| #define PHY_RST_ACK_BIT (0x1 << 16) |
| |
| /* info located in sysctrl */ |
| #define SCTRL_PCIE_CMOS_OFFSET 0x60 |
| #define SCTRL_PCIE_CMOS_BIT 0x10 |
| #define SCTRL_PCIE_ISO_OFFSET 0x44 |
| #define SCTRL_PCIE_ISO_BIT 0x30 |
| #define SCTRL_PCIE_HPCLK_OFFSET 0x190 |
| #define SCTRL_PCIE_HPCLK_BIT 0x184000 |
| #define SCTRL_PCIE_OE_OFFSET 0x14a |
| #define PCIE_DEBOUNCE_PARAM 0xF0F400 |
| #define PCIE_OE_BYPASS (0x3 << 28) |
| |
| /* peri_crg ctrl */ |
| #define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 |
| #define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 |
| |
| /* Time for delay */ |
| #define REF_2_PERST_MIN 20000 |
| #define REF_2_PERST_MAX 25000 |
| #define PERST_2_ACCESS_MIN 10000 |
| #define PERST_2_ACCESS_MAX 12000 |
| #define LINK_WAIT_MIN 900 |
| #define LINK_WAIT_MAX 1000 |
| #define PIPE_CLK_WAIT_MIN 550 |
| #define PIPE_CLK_WAIT_MAX 600 |
| #define TIME_CMOS_MIN 100 |
| #define TIME_CMOS_MAX 105 |
| #define TIME_PHY_PD_MIN 10 |
| #define TIME_PHY_PD_MAX 11 |
| |
| struct kirin_pcie { |
| struct dw_pcie *pci; |
| void __iomem *apb_base; |
| void __iomem *phy_base; |
| struct regmap *crgctrl; |
| struct regmap *sysctrl; |
| struct clk *apb_sys_clk; |
| struct clk *apb_phy_clk; |
| struct clk *phy_ref_clk; |
| struct clk *pcie_aclk; |
| struct clk *pcie_aux_clk; |
| int gpio_id_reset; |
| }; |
| |
| /* Registers in PCIeCTRL */ |
| static inline void kirin_apb_ctrl_writel(struct kirin_pcie *kirin_pcie, |
| u32 val, u32 reg) |
| { |
| writel(val, kirin_pcie->apb_base + reg); |
| } |
| |
| static inline u32 kirin_apb_ctrl_readl(struct kirin_pcie *kirin_pcie, u32 reg) |
| { |
| return readl(kirin_pcie->apb_base + reg); |
| } |
| |
| /* Registers in PCIePHY */ |
| static inline void kirin_apb_phy_writel(struct kirin_pcie *kirin_pcie, |
| u32 val, u32 reg) |
| { |
| writel(val, kirin_pcie->phy_base + reg); |
| } |
| |
| static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 reg) |
| { |
| return readl(kirin_pcie->phy_base + reg); |
| } |
| |
| static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie, |
| struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| |
| kirin_pcie->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); |
| if (IS_ERR(kirin_pcie->phy_ref_clk)) |
| return PTR_ERR(kirin_pcie->phy_ref_clk); |
| |
| kirin_pcie->pcie_aux_clk = devm_clk_get(dev, "pcie_aux"); |
| if (IS_ERR(kirin_pcie->pcie_aux_clk)) |
| return PTR_ERR(kirin_pcie->pcie_aux_clk); |
| |
| kirin_pcie->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); |
| if (IS_ERR(kirin_pcie->apb_phy_clk)) |
| return PTR_ERR(kirin_pcie->apb_phy_clk); |
| |
| kirin_pcie->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys"); |
| if (IS_ERR(kirin_pcie->apb_sys_clk)) |
| return PTR_ERR(kirin_pcie->apb_sys_clk); |
| |
| kirin_pcie->pcie_aclk = devm_clk_get(dev, "pcie_aclk"); |
| if (IS_ERR(kirin_pcie->pcie_aclk)) |
| return PTR_ERR(kirin_pcie->pcie_aclk); |
| |
| return 0; |
| } |
| |
| static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, |
| struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct resource *apb; |
| struct resource *phy; |
| struct resource *dbi; |
| |
| apb = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apb"); |
| kirin_pcie->apb_base = devm_ioremap_resource(dev, apb); |
| if (IS_ERR(kirin_pcie->apb_base)) |
| return PTR_ERR(kirin_pcie->apb_base); |
| |
| phy = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy"); |
| kirin_pcie->phy_base = devm_ioremap_resource(dev, phy); |
| if (IS_ERR(kirin_pcie->phy_base)) |
| return PTR_ERR(kirin_pcie->phy_base); |
| |
| dbi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); |
| kirin_pcie->pci->dbi_base = devm_ioremap_resource(dev, dbi); |
| if (IS_ERR(kirin_pcie->pci->dbi_base)) |
| return PTR_ERR(kirin_pcie->pci->dbi_base); |
| |
| kirin_pcie->crgctrl = |
| syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl"); |
| if (IS_ERR(kirin_pcie->crgctrl)) |
| return PTR_ERR(kirin_pcie->crgctrl); |
| |
| kirin_pcie->sysctrl = |
| syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); |
| if (IS_ERR(kirin_pcie->sysctrl)) |
| return PTR_ERR(kirin_pcie->sysctrl); |
| |
| return 0; |
| } |
| |
| static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie) |
| { |
| struct device *dev = kirin_pcie->pci->dev; |
| u32 reg_val; |
| |
| reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); |
| reg_val &= ~PHY_REF_PAD_BIT; |
| kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); |
| |
| reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0); |
| reg_val &= ~PHY_PWR_DOWN_BIT; |
| kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0); |
| usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX); |
| |
| reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); |
| reg_val &= ~PHY_RST_ACK_BIT; |
| kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); |
| |
| usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX); |
| reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); |
| if (reg_val & PIPE_CLK_STABLE) { |
| dev_err(dev, "PIPE clk is not stable\n"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie) |
| { |
| u32 val; |
| |
| regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); |
| val |= PCIE_DEBOUNCE_PARAM; |
| val &= ~PCIE_OE_BYPASS; |
| regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val); |
| } |
| |
| static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) |
| { |
| int ret = 0; |
| |
| if (!enable) |
| goto close_clk; |
| |
| ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ); |
| if (ret) |
| return ret; |
| |
| ret = clk_prepare_enable(kirin_pcie->phy_ref_clk); |
| if (ret) |
| return ret; |
| |
| ret = clk_prepare_enable(kirin_pcie->apb_sys_clk); |
| if (ret) |
| goto apb_sys_fail; |
| |
| ret = clk_prepare_enable(kirin_pcie->apb_phy_clk); |
| if (ret) |
| goto apb_phy_fail; |
| |
| ret = clk_prepare_enable(kirin_pcie->pcie_aclk); |
| if (ret) |
| goto aclk_fail; |
| |
| ret = clk_prepare_enable(kirin_pcie->pcie_aux_clk); |
| if (ret) |
| goto aux_clk_fail; |
| |
| return 0; |
| |
| close_clk: |
| clk_disable_unprepare(kirin_pcie->pcie_aux_clk); |
| aux_clk_fail: |
| clk_disable_unprepare(kirin_pcie->pcie_aclk); |
| aclk_fail: |
| clk_disable_unprepare(kirin_pcie->apb_phy_clk); |
| apb_phy_fail: |
| clk_disable_unprepare(kirin_pcie->apb_sys_clk); |
| apb_sys_fail: |
| clk_disable_unprepare(kirin_pcie->phy_ref_clk); |
| |
| return ret; |
| } |
| |
| static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie) |
| { |
| int ret; |
| |
| /* Power supply for Host */ |
| regmap_write(kirin_pcie->sysctrl, |
| SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT); |
| usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX); |
| kirin_pcie_oe_enable(kirin_pcie); |
| |
| ret = kirin_pcie_clk_ctrl(kirin_pcie, true); |
| if (ret) |
| return ret; |
| |
| /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ |
| regmap_write(kirin_pcie->sysctrl, |
| SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); |
| regmap_write(kirin_pcie->crgctrl, |
| CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); |
| regmap_write(kirin_pcie->sysctrl, |
| SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); |
| |
| ret = kirin_pcie_phy_init(kirin_pcie); |
| if (ret) |
| goto close_clk; |
| |
| /* perst assert Endpoint */ |
| if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) { |
| usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX); |
| ret = gpio_direction_output(kirin_pcie->gpio_id_reset, 1); |
| if (ret) |
| goto close_clk; |
| usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); |
| |
| return 0; |
| } |
| |
| close_clk: |
| kirin_pcie_clk_ctrl(kirin_pcie, false); |
| return ret; |
| } |
| |
| static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie, |
| bool on) |
| { |
| u32 val; |
| |
| val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL0_ADDR); |
| if (on) |
| val = val | PCIE_ELBI_SLV_DBI_ENABLE; |
| else |
| val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; |
| |
| kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL0_ADDR); |
| } |
| |
| static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie, |
| bool on) |
| { |
| u32 val; |
| |
| val = kirin_apb_ctrl_readl(kirin_pcie, SOC_PCIECTRL_CTRL1_ADDR); |
| if (on) |
| val = val | PCIE_ELBI_SLV_DBI_ENABLE; |
| else |
| val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; |
| |
| kirin_apb_ctrl_writel(kirin_pcie, val, SOC_PCIECTRL_CTRL1_ADDR); |
| } |
| |
| static int kirin_pcie_rd_own_conf(struct pcie_port *pp, |
| int where, int size, u32 *val) |
| { |
| struct dw_pcie *pci = to_dw_pcie_from_pp(pp); |
| struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); |
| int ret; |
| |
| kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); |
| ret = dw_pcie_read(pci->dbi_base + where, size, val); |
| kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); |
| |
| return ret; |
| } |
| |
| static int kirin_pcie_wr_own_conf(struct pcie_port *pp, |
| int where, int size, u32 val) |
| { |
| struct dw_pcie *pci = to_dw_pcie_from_pp(pp); |
| struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); |
| int ret; |
| |
| kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); |
| ret = dw_pcie_write(pci->dbi_base + where, size, val); |
| kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); |
| |
| return ret; |
| } |
| |
| static u32 kirin_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, |
| u32 reg, size_t size) |
| { |
| struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); |
| u32 ret; |
| |
| kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); |
| dw_pcie_read(base + reg, size, &ret); |
| kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); |
| |
| return ret; |
| } |
| |
| static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, |
| u32 reg, size_t size, u32 val) |
| { |
| struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); |
| |
| kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); |
| dw_pcie_write(base + reg, size, val); |
| kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); |
| } |
| |
| static int kirin_pcie_link_up(struct dw_pcie *pci) |
| { |
| struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); |
| u32 val = kirin_apb_ctrl_readl(kirin_pcie, PCIE_APB_PHY_STATUS0); |
| |
| if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int kirin_pcie_establish_link(struct pcie_port *pp) |
| { |
| struct dw_pcie *pci = to_dw_pcie_from_pp(pp); |
| struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); |
| struct device *dev = kirin_pcie->pci->dev; |
| int count = 0; |
| |
| if (kirin_pcie_link_up(pci)) |
| return 0; |
| |
| dw_pcie_setup_rc(pp); |
| |
| /* assert LTSSM enable */ |
| kirin_apb_ctrl_writel(kirin_pcie, PCIE_LTSSM_ENABLE_BIT, |
| PCIE_APP_LTSSM_ENABLE); |
| |
| /* check if the link is up or not */ |
| while (!kirin_pcie_link_up(pci)) { |
| usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX); |
| count++; |
| if (count == 1000) { |
| dev_err(dev, "Link Fail\n"); |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int kirin_pcie_host_init(struct pcie_port *pp) |
| { |
| kirin_pcie_establish_link(pp); |
| |
| if (IS_ENABLED(CONFIG_PCI_MSI)) |
| dw_pcie_msi_init(pp); |
| |
| return 0; |
| } |
| |
| static const struct dw_pcie_ops kirin_dw_pcie_ops = { |
| .read_dbi = kirin_pcie_read_dbi, |
| .write_dbi = kirin_pcie_write_dbi, |
| .link_up = kirin_pcie_link_up, |
| }; |
| |
| static const struct dw_pcie_host_ops kirin_pcie_host_ops = { |
| .rd_own_conf = kirin_pcie_rd_own_conf, |
| .wr_own_conf = kirin_pcie_wr_own_conf, |
| .host_init = kirin_pcie_host_init, |
| }; |
| |
| static int kirin_pcie_add_msi(struct dw_pcie *pci, |
| struct platform_device *pdev) |
| { |
| int irq; |
| |
| if (IS_ENABLED(CONFIG_PCI_MSI)) { |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| dev_err(&pdev->dev, |
| "failed to get MSI IRQ (%d)\n", irq); |
| return irq; |
| } |
| |
| pci->pp.msi_irq = irq; |
| } |
| |
| return 0; |
| } |
| |
| static int kirin_add_pcie_port(struct dw_pcie *pci, |
| struct platform_device *pdev) |
| { |
| int ret; |
| |
| ret = kirin_pcie_add_msi(pci, pdev); |
| if (ret) |
| return ret; |
| |
| pci->pp.ops = &kirin_pcie_host_ops; |
| |
| return dw_pcie_host_init(&pci->pp); |
| } |
| |
| static int kirin_pcie_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct kirin_pcie *kirin_pcie; |
| struct dw_pcie *pci; |
| int ret; |
| |
| if (!dev->of_node) { |
| dev_err(dev, "NULL node\n"); |
| return -EINVAL; |
| } |
| |
| kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL); |
| if (!kirin_pcie) |
| return -ENOMEM; |
| |
| pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); |
| if (!pci) |
| return -ENOMEM; |
| |
| pci->dev = dev; |
| pci->ops = &kirin_dw_pcie_ops; |
| kirin_pcie->pci = pci; |
| |
| ret = kirin_pcie_get_clk(kirin_pcie, pdev); |
| if (ret) |
| return ret; |
| |
| ret = kirin_pcie_get_resource(kirin_pcie, pdev); |
| if (ret) |
| return ret; |
| |
| kirin_pcie->gpio_id_reset = of_get_named_gpio(dev->of_node, |
| "reset-gpios", 0); |
| if (kirin_pcie->gpio_id_reset < 0) |
| return -ENODEV; |
| |
| ret = kirin_pcie_power_on(kirin_pcie); |
| if (ret) |
| return ret; |
| |
| platform_set_drvdata(pdev, kirin_pcie); |
| |
| return kirin_add_pcie_port(pci, pdev); |
| } |
| |
| static const struct of_device_id kirin_pcie_match[] = { |
| { .compatible = "hisilicon,kirin960-pcie" }, |
| {}, |
| }; |
| |
| static struct platform_driver kirin_pcie_driver = { |
| .probe = kirin_pcie_probe, |
| .driver = { |
| .name = "kirin-pcie", |
| .of_match_table = kirin_pcie_match, |
| .suppress_bind_attrs = true, |
| }, |
| }; |
| builtin_platform_driver(kirin_pcie_driver); |