The pcie-kirin PCIe driver contains internally a PHY interface for Kirin 960. As the next patches will add support for using an external PHY driver, reorganize the driver in a way that the PHY part will be self-contained. This could be moved to a separate PHY driver, but a change like that would mean a non-backward-compatible DT schema change. Acked-by: Xiaowei Song <songxiaowei@xxxxxxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> --- See [PATCH v13 00/10] at: https://lore.kernel.org/all/cover.1634539769.git.mchehab+huawei@xxxxxxxxxx/ drivers/pci/controller/dwc/pcie-kirin.c | 298 ++++++++++++++---------- 1 file changed, 173 insertions(+), 125 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c index 026fd1e42a55..b4063a3434df 100644 --- a/drivers/pci/controller/dwc/pcie-kirin.c +++ b/drivers/pci/controller/dwc/pcie-kirin.c @@ -28,26 +28,16 @@ #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 @@ -60,6 +50,29 @@ #define PCIE_DEBOUNCE_PARAM 0xF0F400 #define PCIE_OE_BYPASS (0x3 << 28) +struct kirin_pcie { + struct dw_pcie *pci; + struct phy *phy; + void __iomem *apb_base; + void *phy_priv; /* Needed for Kirin 960 PHY */ +}; + +/* + * Kirin 960 PHY. Can't be split into a PHY driver without changing the + * DT schema. + */ + +#define REF_CLK_FREQ 100000000 + +/* PHY info located in APB */ +#define PCIE_APB_PHY_CTRL0 0x0 +#define PCIE_APB_PHY_CTRL1 0x4 +#define PCIE_APB_PHY_STATUS0 0x400 +#define PIPE_CLK_STABLE BIT(19) +#define PHY_REF_PAD_BIT BIT(8) +#define PHY_PWR_DOWN_BIT BIT(22) +#define PHY_RST_ACK_BIT BIT(16) + /* peri_crg ctrl */ #define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 #define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 @@ -69,8 +82,6 @@ #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 @@ -78,118 +89,112 @@ #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 hi3660_pcie_phy { + struct device *dev; + void __iomem *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; + struct clk *aclk; + struct clk *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, +static inline void kirin_apb_phy_writel(struct hi3660_pcie_phy *hi3660_pcie_phy, u32 val, u32 reg) { - writel(val, kirin_pcie->phy_base + reg); + writel(val, hi3660_pcie_phy->base + reg); } -static inline u32 kirin_apb_phy_readl(struct kirin_pcie *kirin_pcie, u32 reg) +static inline u32 kirin_apb_phy_readl(struct hi3660_pcie_phy *hi3660_pcie_phy, + u32 reg) { - return readl(kirin_pcie->phy_base + reg); + return readl(hi3660_pcie_phy->base + reg); } -static long kirin_pcie_get_clk(struct kirin_pcie *kirin_pcie, - struct platform_device *pdev) +static int hi3660_pcie_phy_get_clk(struct hi3660_pcie_phy *phy) { - struct device *dev = &pdev->dev; + struct device *dev = phy->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); + phy->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); + if (IS_ERR(phy->phy_ref_clk)) + return PTR_ERR(phy->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); + phy->aux_clk = devm_clk_get(dev, "pcie_aux"); + if (IS_ERR(phy->aux_clk)) + return PTR_ERR(phy->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); + phy->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); + if (IS_ERR(phy->apb_phy_clk)) + return PTR_ERR(phy->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); + phy->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys"); + if (IS_ERR(phy->apb_sys_clk)) + return PTR_ERR(phy->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); + phy->aclk = devm_clk_get(dev, "pcie_aclk"); + if (IS_ERR(phy->aclk)) + return PTR_ERR(phy->aclk); return 0; } -static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, - struct platform_device *pdev) +static int hi3660_pcie_phy_get_resource(struct hi3660_pcie_phy *phy) { - kirin_pcie->apb_base = - devm_platform_ioremap_resource_byname(pdev, "apb"); - if (IS_ERR(kirin_pcie->apb_base)) - return PTR_ERR(kirin_pcie->apb_base); - - kirin_pcie->phy_base = - devm_platform_ioremap_resource_byname(pdev, "phy"); - if (IS_ERR(kirin_pcie->phy_base)) - return PTR_ERR(kirin_pcie->phy_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); + struct device *dev = phy->dev; + struct platform_device *pdev; + + /* registers */ + pdev = container_of(dev, struct platform_device, dev); + + phy->base = devm_platform_ioremap_resource_byname(pdev, "phy"); + if (IS_ERR(phy->base)) + return PTR_ERR(phy->base); + + phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl"); + if (IS_ERR(phy->crgctrl)) + return PTR_ERR(phy->crgctrl); + + phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); + if (IS_ERR(phy->sysctrl)) + return PTR_ERR(phy->sysctrl); + + /* gpios */ + phy->gpio_id_reset = of_get_named_gpio(dev->of_node, + "reset-gpios", 0); + if (phy->gpio_id_reset == -EPROBE_DEFER) { + return -EPROBE_DEFER; + } else if (!gpio_is_valid(phy->gpio_id_reset)) { + dev_err(phy->dev, "unable to get a valid gpio pin\n"); + return -ENODEV; + } return 0; } -static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie) +static int hi3660_pcie_phy_start(struct hi3660_pcie_phy *phy) { - struct device *dev = kirin_pcie->pci->dev; + struct device *dev = phy->dev; u32 reg_val; - reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL1); + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1); reg_val &= ~PHY_REF_PAD_BIT; - kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); + kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1); - reg_val = kirin_apb_phy_readl(kirin_pcie, PCIE_APB_PHY_CTRL0); + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL0); reg_val &= ~PHY_PWR_DOWN_BIT; - kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL0); + kirin_apb_phy_writel(phy, 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 = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1); reg_val &= ~PHY_RST_ACK_BIT; - kirin_apb_phy_writel(kirin_pcie, reg_val, PCIE_APB_PHY_CTRL1); + kirin_apb_phy_writel(phy, 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); + reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_STATUS0); if (reg_val & PIPE_CLK_STABLE) { dev_err(dev, "PIPE clk is not stable\n"); return -EINVAL; @@ -198,105 +203,157 @@ static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie) return 0; } -static void kirin_pcie_oe_enable(struct kirin_pcie *kirin_pcie) +static void hi3660_pcie_phy_oe_enable(struct hi3660_pcie_phy *phy) { u32 val; - regmap_read(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); + regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); val |= PCIE_DEBOUNCE_PARAM; val &= ~PCIE_OE_BYPASS; - regmap_write(kirin_pcie->sysctrl, SCTRL_PCIE_OE_OFFSET, val); + regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val); } -static int kirin_pcie_clk_ctrl(struct kirin_pcie *kirin_pcie, bool enable) +static int hi3660_pcie_phy_clk_ctrl(struct hi3660_pcie_phy *phy, bool enable) { int ret = 0; if (!enable) goto close_clk; - ret = clk_set_rate(kirin_pcie->phy_ref_clk, REF_CLK_FREQ); + ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ); if (ret) return ret; - ret = clk_prepare_enable(kirin_pcie->phy_ref_clk); + ret = clk_prepare_enable(phy->phy_ref_clk); if (ret) return ret; - ret = clk_prepare_enable(kirin_pcie->apb_sys_clk); + ret = clk_prepare_enable(phy->apb_sys_clk); if (ret) goto apb_sys_fail; - ret = clk_prepare_enable(kirin_pcie->apb_phy_clk); + ret = clk_prepare_enable(phy->apb_phy_clk); if (ret) goto apb_phy_fail; - ret = clk_prepare_enable(kirin_pcie->pcie_aclk); + ret = clk_prepare_enable(phy->aclk); if (ret) goto aclk_fail; - ret = clk_prepare_enable(kirin_pcie->pcie_aux_clk); + ret = clk_prepare_enable(phy->aux_clk); if (ret) goto aux_clk_fail; return 0; close_clk: - clk_disable_unprepare(kirin_pcie->pcie_aux_clk); + clk_disable_unprepare(phy->aux_clk); aux_clk_fail: - clk_disable_unprepare(kirin_pcie->pcie_aclk); + clk_disable_unprepare(phy->aclk); aclk_fail: - clk_disable_unprepare(kirin_pcie->apb_phy_clk); + clk_disable_unprepare(phy->apb_phy_clk); apb_phy_fail: - clk_disable_unprepare(kirin_pcie->apb_sys_clk); + clk_disable_unprepare(phy->apb_sys_clk); apb_sys_fail: - clk_disable_unprepare(kirin_pcie->phy_ref_clk); + clk_disable_unprepare(phy->phy_ref_clk); return ret; } -static int kirin_pcie_power_on(struct kirin_pcie *kirin_pcie) +static int hi3660_pcie_phy_power_on(struct kirin_pcie *pcie) { + struct hi3660_pcie_phy *phy = pcie->phy_priv; int ret; /* Power supply for Host */ - regmap_write(kirin_pcie->sysctrl, + regmap_write(phy->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); + hi3660_pcie_phy_oe_enable(phy); + + ret = hi3660_pcie_phy_clk_ctrl(phy, true); if (ret) return ret; /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ - regmap_write(kirin_pcie->sysctrl, + regmap_write(phy->sysctrl, SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); - regmap_write(kirin_pcie->crgctrl, + regmap_write(phy->crgctrl, CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); - regmap_write(kirin_pcie->sysctrl, + regmap_write(phy->sysctrl, SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); - ret = kirin_pcie_phy_init(kirin_pcie); + ret = hi3660_pcie_phy_start(phy); if (ret) - goto close_clk; + goto disable_clks; /* perst assert Endpoint */ - if (!gpio_request(kirin_pcie->gpio_id_reset, "pcie_perst")) { + if (!gpio_request(phy->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); + ret = gpio_direction_output(phy->gpio_id_reset, 1); if (ret) - goto close_clk; + goto disable_clks; usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); - return 0; } -close_clk: - kirin_pcie_clk_ctrl(kirin_pcie, false); +disable_clks: + hi3660_pcie_phy_clk_ctrl(phy, false); return ret; } +static int hi3660_pcie_phy_init(struct platform_device *pdev, + struct kirin_pcie *pcie) +{ + struct device *dev = &pdev->dev; + struct hi3660_pcie_phy *phy; + int ret; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + pcie->phy_priv = phy; + phy->dev = dev; + + /* registers */ + pdev = container_of(dev, struct platform_device, dev); + + ret = hi3660_pcie_phy_get_clk(phy); + if (ret) + return ret; + + return hi3660_pcie_phy_get_resource(phy); +} + +/* + * The non-PHY part starts here + */ + +/* 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); +} + +static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, + struct platform_device *pdev) +{ + kirin_pcie->apb_base = + devm_platform_ioremap_resource_byname(pdev, "apb"); + if (IS_ERR(kirin_pcie->apb_base)) + return PTR_ERR(kirin_pcie->apb_base); + + return 0; +} + static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie, bool on) { @@ -444,7 +501,7 @@ static int kirin_pcie_probe(struct platform_device *pdev) pci->pp.ops = &kirin_pcie_host_ops; kirin_pcie->pci = pci; - ret = kirin_pcie_get_clk(kirin_pcie, pdev); + ret = hi3660_pcie_phy_init(pdev, kirin_pcie); if (ret) return ret; @@ -452,16 +509,7 @@ static int kirin_pcie_probe(struct platform_device *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 == -EPROBE_DEFER) { - return -EPROBE_DEFER; - } else if (!gpio_is_valid(kirin_pcie->gpio_id_reset)) { - dev_err(dev, "unable to get a valid gpio pin\n"); - return -ENODEV; - } - - ret = kirin_pcie_power_on(kirin_pcie); + ret = hi3660_pcie_phy_power_on(kirin_pcie); if (ret) return ret; @@ -479,8 +527,8 @@ 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, + .of_match_table = kirin_pcie_match, + .suppress_bind_attrs = true, }, }; builtin_platform_driver(kirin_pcie_driver); -- 2.31.1
