--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe phy driver for Kirin 970
+ *
+ * Copyright (C) 2017 HiSilicon Electronics Co., Ltd.
+ * https://www.huawei.com
+ * Copyright (C) 2021 Huawei Technologies Co., Ltd.
+ * https://www.huawei.com
+ *
+ * Authors:
+ * Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
+ * Manivannan Sadhasivam <mani@kernel.org>
+ *
+ * Based on:
+ * https://lore.kernel.org/lkml/4c9d6581478aa966698758c0420933f5defab4dd.1612335031.git.mchehab+huawei@kernel.org/
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define AXI_CLK_FREQ 207500000
+#define REF_CLK_FREQ 100000000
+
+/* PCIe CTRL registers */
+#define SOC_PCIECTRL_CTRL7_ADDR 0x01c
+#define SOC_PCIECTRL_CTRL12_ADDR 0x030
+#define SOC_PCIECTRL_CTRL20_ADDR 0x050
+#define SOC_PCIECTRL_CTRL21_ADDR 0x054
+
+#define PCIE_OUTPUT_PULL_BITS GENMASK(3, 0)
+#define SOC_PCIECTRL_CTRL20_2P_MEM_CTRL 0x02605550
+#define SOC_PCIECTRL_CTRL21_DEFAULT 0x20000070
+#define PCIE_PULL_UP_SYS_AUX_PWR_DET BIT(10)
+#define PCIE_OUTPUT_PULL_DOWN BIT(1)
+
+/* PCIe PHY registers */
+#define SOC_PCIEPHY_CTRL0_ADDR 0x000
+#define SOC_PCIEPHY_CTRL1_ADDR 0x004
+#define SOC_PCIEPHY_CTRL38_ADDR 0x0098
+#define SOC_PCIEPHY_STATE0_ADDR 0x400
+
+#define RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1 0xc004
+#define SUP_DIG_LVL_OVRD_IN 0x003c
+#define LANEN_DIG_ASIC_TX_OVRD_IN_1 0x4008
+#define LANEN_DIG_ASIC_TX_OVRD_IN_2 0x400c
+
+#define PCIEPHY_RESET_BIT BIT(17)
+#define PCIEPHY_PIPE_LINE0_RESET_BIT BIT(19)
+#define PCIE_TXDETECT_RX_FAIL BIT(2)
+#define PCIE_CLK_SOURCE BIT(8)
+#define PCIE_IS_CLOCK_STABLE BIT(19)
+#define PCIE_PULL_DOWN_PHY_TEST_POWERDOWN BIT(22)
+#define PCIE_DEASSERT_CONTROLLER_PERST BIT(2)
+
+#define EYEPARAM_NOCFG 0xffffffff
+#define EYE_PARM0_MASK GENMASK(8, 6)
+#define EYE_PARM1_MASK GENMASK(11, 8)
+#define EYE_PARM2_MASK GENMASK(5, 0)
+#define EYE_PARM3_MASK GENMASK(12, 7)
+#define EYE_PARM4_MASK GENMASK(14, 9)
+#define EYE_PARM0_EN BIT(9)
+#define EYE_PARM1_EN BIT(12)
+#define EYE_PARM2_EN BIT(6)
+#define EYE_PARM3_EN BIT(13)
+#define EYE_PARM4_EN BIT(15)
+
+/* hi3670 pciephy register */
+#define APB_PHY_START_ADDR 0x40000
+#define SOC_PCIEPHY_MMC1PLL_CTRL1 0xc04
+#define SOC_PCIEPHY_MMC1PLL_CTRL16 0xC40
+#define SOC_PCIEPHY_MMC1PLL_CTRL17 0xC44
+#define SOC_PCIEPHY_MMC1PLL_CTRL20 0xC50
+#define SOC_PCIEPHY_MMC1PLL_CTRL21 0xC54
+#define SOC_PCIEPHY_MMC1PLL_STAT0 0xE00
+
+#define CRGPERIPH_PEREN12 0x470
+#define CRGPERIPH_PERDIS12 0x474
+#define CRGPERIPH_PCIECTRL0 0x800
+
+#define PCIE_FNPLL_FBDIV_MASK GENMASK(27, 16)
+#define PCIE_FNPLL_FRACDIV_MASK GENMASK(23, 0)
+#define PCIE_FNPLL_POSTDIV1_MASK GENMASK(10, 8)
+#define PCIE_FNPLL_POSTDIV2_MASK GENMASK(14, 12)
+#define PCIE_FNPLL_PLL_MODE_MASK BIT(25)
+
+#define PCIE_FNPLL_DLL_EN BIT(27)
+#define PCIE_FNPLL_FBDIV 0xd0
+#define PCIE_FNPLL_FRACDIV 0x555555
+#define PCIE_FNPLL_POSTDIV1 0x5
+#define PCIE_FNPLL_POSTDIV2 0x4
+#define PCIE_FNPLL_PLL_MODE 0x0
+
+#define PCIE_PHY_MMC1PLL 0x20
+#define PCIE_PHY_CHOOSE_FNPLL BIT(27)
+#define PCIE_PHY_MMC1PLL_DISABLE BIT(0)
+#define PCIE_PHY_PCIEPL_BP BIT(16)
+
+/* define ie,oe cfg */
+#define IO_OE_HARD_GT_MODE BIT(1)
+#define IO_IE_EN_HARD_BYPASS BIT(27)
+#define IO_OE_EN_HARD_BYPASS BIT(11)
+#define IO_HARD_CTRL_DEBOUNCE_BYPASS BIT(10)
+#define IO_OE_GT_MODE BIT(8)
+#define DEBOUNCE_WAITCFG_IN GENMASK(23, 20)
+#define DEBOUNCE_WAITCFG_OUT GENMASK(16, 13)
+
+#define IO_HP_DEBOUNCE_GT (BIT(12) | BIT(15))
+#define IO_PHYREF_SOFT_GT_MODE BIT(14)
+#define IO_REF_SOFT_GT_MODE BIT(13)
+#define IO_REF_HARD_GT_MODE BIT(0)
+
+/* noc power domain */
+#define NOC_POWER_IDLEREQ_1 0x38c
+#define NOC_POWER_IDLE_1 0x394
+#define NOC_PW_MASK 0x10000
+#define NOC_PW_SET_BIT 0x1
+
+#define NUM_EYEPARAM 5
+
+/* 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 GENMASK(29, 28)
+
+/* peri_crg ctrl */
+#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
+#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
+
+#define FNPLL_HAS_LOCKED BIT(4)
+
+/* Time for delay */
+#define TIME_CMOS_MIN 100
+#define TIME_CMOS_MAX 105
+#define PIPE_CLK_STABLE_TIME 100
+#define PLL_CTRL_WAIT_TIME 200
+#define NOC_POWER_TIME 100
+
+struct hi3670_pcie_phy {
+ struct device *dev;
+ void __iomem *base;
+ struct regmap *apb;
+ struct regmap *crgctrl;
+ struct regmap *sysctrl;
+ struct regmap *pmctrl;
+ struct clk *apb_sys_clk;
+ struct clk *apb_phy_clk;
+ struct clk *phy_ref_clk;
+ struct clk *aclk;
+ struct clk *aux_clk;
+ u32 eye_param[NUM_EYEPARAM];
+};
+
+/* Registers in PCIePHY */
+static inline void hi3670_apb_phy_writel(struct hi3670_pcie_phy *phy, u32 val,
+ u32 reg)
+{
+ writel(val, phy->base + APB_PHY_START_ADDR + reg);
+}
+
+static inline u32 hi3670_apb_phy_readl(struct hi3670_pcie_phy *phy, u32 reg)
+{
+ return readl(phy->base + APB_PHY_START_ADDR + reg);
+}
+
+static inline void hi3670_apb_phy_updatel(struct hi3670_pcie_phy *phy,
+ u32 val, u32 mask, u32 reg)
+{
+ u32 regval;
+
+ regval = hi3670_apb_phy_readl(phy, reg);
+ regval &= ~mask;
+ regval |= val;
+ hi3670_apb_phy_writel(phy, regval, reg);
+}
+
+static inline void kirin_apb_natural_phy_writel(struct hi3670_pcie_phy *phy,
+ u32 val, u32 reg)
+{
+ writel(val, phy->base + reg);
+}
+
+static inline u32 kirin_apb_natural_phy_readl(struct hi3670_pcie_phy *phy,
+ u32 reg)
+{
+ return readl(phy->base + reg);
+}
+
+static void hi3670_pcie_phy_oe_enable(struct hi3670_pcie_phy *phy, bool enable)
+{
+ u32 val;
+
+ regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val);
+ val |= PCIE_DEBOUNCE_PARAM;
+ if (enable)
+ val &= ~PCIE_OE_BYPASS;
+ else
+ val |= PCIE_OE_BYPASS;
+ regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
+}
+
+static void hi3670_pcie_get_eyeparam(struct hi3670_pcie_phy *phy)
+{
+ struct device *dev = phy->dev;
+ struct device_node *np;
+ int ret, i;
+
+ np = dev->of_node;
+
+ ret = of_property_read_u32_array(np, "hisilicon,eye-diagram-param",
+ phy->eye_param, NUM_EYEPARAM);
+ if (!ret)
+ return;
+
+ /* There's no optional eye_param property. Set array to default */
+ for (i = 0; i < NUM_EYEPARAM; i++)
+ phy->eye_param[i] = EYEPARAM_NOCFG;
+}
+
+static void hi3670_pcie_set_eyeparam(struct hi3670_pcie_phy *phy)
+{
+ u32 val;
+
+ val = kirin_apb_natural_phy_readl(phy, RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1);
+
+ if (phy->eye_param[1] != EYEPARAM_NOCFG) {
+ val &= ~EYE_PARM1_MASK;
+ val |= FIELD_PREP(EYE_PARM1_MASK, phy->eye_param[1]);
+ val |= EYE_PARM1_EN;
+ }
+ kirin_apb_natural_phy_writel(phy, val,
+ RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1);
+
+ val = kirin_apb_natural_phy_readl(phy, LANEN_DIG_ASIC_TX_OVRD_IN_2);
+ val &= ~(EYE_PARM2_MASK | EYE_PARM3_MASK);
+ if (phy->eye_param[2] != EYEPARAM_NOCFG) {
+ val |= FIELD_PREP(EYE_PARM2_MASK, phy->eye_param[2]);
+ val |= EYE_PARM2_EN;
+ }
+
+ if (phy->eye_param[3] != EYEPARAM_NOCFG) {
+ val |= FIELD_PREP(EYE_PARM3_MASK, phy->eye_param[3]);
+ val |= EYE_PARM3_EN;
+ }
+
+ kirin_apb_natural_phy_writel(phy, val, LANEN_DIG_ASIC_TX_OVRD_IN_2);
+
+ val = kirin_apb_natural_phy_readl(phy, SUP_DIG_LVL_OVRD_IN);
+ if (phy->eye_param[0] != EYEPARAM_NOCFG) {
+ val &= ~EYE_PARM0_MASK;
+ val |= FIELD_PREP(EYE_PARM0_MASK, phy->eye_param[0]);
+ val |= EYE_PARM0_EN;
+ }
+ kirin_apb_natural_phy_writel(phy, val, SUP_DIG_LVL_OVRD_IN);
+
+ val = kirin_apb_natural_phy_readl(phy, LANEN_DIG_ASIC_TX_OVRD_IN_1);
+ if (phy->eye_param[4] != EYEPARAM_NOCFG) {
+ val &= ~EYE_PARM4_MASK;
+ val |= FIELD_PREP(EYE_PARM4_MASK, phy->eye_param[4]);
+ val |= EYE_PARM4_EN;
+ }
+ kirin_apb_natural_phy_writel(phy, val, LANEN_DIG_ASIC_TX_OVRD_IN_1);
+}
+
+static void hi3670_pcie_natural_cfg(struct hi3670_pcie_phy *phy)
+{
+ u32 val;
+
+ /* change 2p mem_ctrl */
+ regmap_write(phy->apb, SOC_PCIECTRL_CTRL20_ADDR,
+ SOC_PCIECTRL_CTRL20_2P_MEM_CTRL);
+
+ regmap_read(phy->apb, SOC_PCIECTRL_CTRL7_ADDR, &val);
+ val |= PCIE_PULL_UP_SYS_AUX_PWR_DET;
+ regmap_write(phy->apb, SOC_PCIECTRL_CTRL7_ADDR, val);
+
+ /* output, pull down */
+ regmap_read(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, &val);
+ val &= ~PCIE_OUTPUT_PULL_BITS;
+ val |= PCIE_OUTPUT_PULL_DOWN;
+ regmap_write(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, val);
+
+ /* Handle phy_reset and lane0_reset to HW */
+ hi3670_apb_phy_updatel(phy, PCIEPHY_RESET_BIT,
+ PCIEPHY_PIPE_LINE0_RESET_BIT | PCIEPHY_RESET_BIT,
+ SOC_PCIEPHY_CTRL1_ADDR);
+
+ /* fix chip bug: TxDetectRx fail */
+ hi3670_apb_phy_updatel(phy, PCIE_TXDETECT_RX_FAIL, PCIE_TXDETECT_RX_FAIL,
+ SOC_PCIEPHY_CTRL38_ADDR);
+}
+
+static void hi3670_pcie_pll_init(struct hi3670_pcie_phy *phy)
+{
+ hi3670_apb_phy_updatel(phy, PCIE_PHY_CHOOSE_FNPLL, PCIE_PHY_CHOOSE_FNPLL,
+ SOC_PCIEPHY_MMC1PLL_CTRL1);
+
+ hi3670_apb_phy_updatel(phy,
+ FIELD_PREP(PCIE_FNPLL_FBDIV_MASK, PCIE_FNPLL_FBDIV),
+ PCIE_FNPLL_FBDIV_MASK,
+ SOC_PCIEPHY_MMC1PLL_CTRL16);
+
+ hi3670_apb_phy_updatel(phy,
+ FIELD_PREP(PCIE_FNPLL_FRACDIV_MASK, PCIE_FNPLL_FRACDIV),
+ PCIE_FNPLL_FRACDIV_MASK, SOC_PCIEPHY_MMC1PLL_CTRL17);
+
+ hi3670_apb_phy_updatel(phy,
+ PCIE_FNPLL_DLL_EN |
+ FIELD_PREP(PCIE_FNPLL_POSTDIV1_MASK, PCIE_FNPLL_POSTDIV1) |
+ FIELD_PREP(PCIE_FNPLL_POSTDIV2_MASK, PCIE_FNPLL_POSTDIV2) |
+ FIELD_PREP(PCIE_FNPLL_PLL_MODE_MASK, PCIE_FNPLL_PLL_MODE),
+ PCIE_FNPLL_POSTDIV1_MASK |
+ PCIE_FNPLL_POSTDIV2_MASK |
+ PCIE_FNPLL_PLL_MODE_MASK | PCIE_FNPLL_DLL_EN,
+ SOC_PCIEPHY_MMC1PLL_CTRL20);
+
+ hi3670_apb_phy_writel(phy, PCIE_PHY_MMC1PLL,
+ SOC_PCIEPHY_MMC1PLL_CTRL21);
+}
+
+static int hi3670_pcie_pll_ctrl(struct hi3670_pcie_phy *phy, bool enable)
+{
+ struct device *dev = phy->dev;
+ u32 val;
+ int time = PLL_CTRL_WAIT_TIME;
+
+ if (enable) {
+ /* pd = 0 */
+ hi3670_apb_phy_updatel(phy, 0, PCIE_PHY_MMC1PLL_DISABLE,
+ SOC_PCIEPHY_MMC1PLL_CTRL16);
+
+ /* choose FNPLL */
+ val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_MMC1PLL_STAT0);
+ while (!(val & FNPLL_HAS_LOCKED)) {
+ if (!time) {
+ dev_err(dev, "wait for pll_lock timeout\n");
+ return -EINVAL;
+ }
+ time--;
+ udelay(1);
+ val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_MMC1PLL_STAT0);
+ }
+
+ hi3670_apb_phy_updatel(phy, 0, PCIE_PHY_PCIEPL_BP,
+ SOC_PCIEPHY_MMC1PLL_CTRL20);
+
+ } else {
+ hi3670_apb_phy_updatel(phy,
+ PCIE_PHY_MMC1PLL_DISABLE,
+ PCIE_PHY_MMC1PLL_DISABLE,
+ SOC_PCIEPHY_MMC1PLL_CTRL16);
+
+ hi3670_apb_phy_updatel(phy, PCIE_PHY_PCIEPL_BP,
+ PCIE_PHY_PCIEPL_BP,
+ SOC_PCIEPHY_MMC1PLL_CTRL20);
+ }
+
+ return 0;
+}
+
+static void hi3670_pcie_hp_debounce_gt(struct hi3670_pcie_phy *phy, bool open)
+{
+ if (open)
+ /* gt_clk_pcie_hp/gt_clk_pcie_debounce open */
+ regmap_write(phy->crgctrl, CRGPERIPH_PEREN12,
+ IO_HP_DEBOUNCE_GT);
+ else
+ /* gt_clk_pcie_hp/gt_clk_pcie_debounce close */
+ regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
+ IO_HP_DEBOUNCE_GT);
+}
+
+static void hi3670_pcie_phyref_gt(struct hi3670_pcie_phy *phy, bool open)
+{
+ unsigned int val;
+
+ regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
+
+ if (open)
+ val &= ~IO_OE_HARD_GT_MODE; /* enable hard gt mode */
+ else
+ val |= IO_OE_HARD_GT_MODE; /* disable hard gt mode */
+
+ regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
+
+ /* disable soft gt mode */
+ regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12, IO_PHYREF_SOFT_GT_MODE);
+}
+
+static void hi3670_pcie_oe_ctrl(struct hi3670_pcie_phy *phy, bool en_flag)
+{
+ unsigned int val;
+
+ regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
+
+ /* set ie cfg */
+ val |= IO_IE_EN_HARD_BYPASS;
+
+ /* set oe cfg */
+ val &= ~IO_HARD_CTRL_DEBOUNCE_BYPASS;
+
+ /* set phy_debounce in&out time */
+ val |= (DEBOUNCE_WAITCFG_IN | DEBOUNCE_WAITCFG_OUT);
+
+ /* select oe_gt_mode */
+ val |= IO_OE_GT_MODE;
+
+ if (en_flag)
+ val &= ~IO_OE_EN_HARD_BYPASS;
+ else
+ val |= IO_OE_EN_HARD_BYPASS;
+
+ regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
+}
+
+static void hi3670_pcie_ioref_gt(struct hi3670_pcie_phy *phy, bool open)
+{
+ unsigned int val;
+
+ if (open) {
+ regmap_write(phy->apb, SOC_PCIECTRL_CTRL21_ADDR,
+ SOC_PCIECTRL_CTRL21_DEFAULT);
+
+ hi3670_pcie_oe_ctrl(phy, true);
+
+ /* en hard gt mode */
+ regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
+ val &= ~IO_REF_HARD_GT_MODE;
+ regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
+
+ /* disable soft gt mode */
+ regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
+ IO_REF_SOFT_GT_MODE);
+
+ } else {
+ /* disable hard gt mode */
+ regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
+ val |= IO_REF_HARD_GT_MODE;
+ regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
+
+ /* disable soft gt mode */
+ regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
+ IO_REF_SOFT_GT_MODE);
+
+ hi3670_pcie_oe_ctrl(phy, false);
+ }
+}
+
+static int hi3670_pcie_allclk_ctrl(struct hi3670_pcie_phy *phy, bool clk_on)
+{
+ struct device *dev = phy->dev;
+ int ret = 0;
+
+ if (!clk_on)
+ goto close_clocks;
+
+ /* choose 100MHz clk src: Bit[8]==1 pad, Bit[8]==0 pll */
+ hi3670_apb_phy_updatel(phy, 0, PCIE_CLK_SOURCE,
+ SOC_PCIEPHY_CTRL1_ADDR);
+
+ hi3670_pcie_pll_init(phy);
+
+ ret = hi3670_pcie_pll_ctrl(phy, true);
+ if (ret) {
+ dev_err(dev, "Failed to enable pll\n");
+ return -EINVAL;
+ }
+ hi3670_pcie_hp_debounce_gt(phy, true);
+ hi3670_pcie_phyref_gt(phy, true);
+ hi3670_pcie_ioref_gt(phy, true);
+
+ ret = clk_set_rate(phy->aclk, AXI_CLK_FREQ);
+ if (ret) {
+ dev_err(dev, "Failed to set rate\n");
+ goto close_clocks;
+ }
+
+ return 0;
+
+close_clocks:
+ hi3670_pcie_ioref_gt(phy, false);
+ hi3670_pcie_phyref_gt(phy, false);
+ hi3670_pcie_hp_debounce_gt(phy, false);
+
+ hi3670_pcie_pll_ctrl(phy, false);
+
+ return ret;
+}
+
+static bool is_pipe_clk_stable(struct hi3670_pcie_phy *phy)
+{
+ struct device *dev = phy->dev;
+ u32 val;
+ u32 time = PIPE_CLK_STABLE_TIME;
+ u32 pipe_clk_stable = PCIE_IS_CLOCK_STABLE;
+
+ val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_STATE0_ADDR);
+ while (val & pipe_clk_stable) {
+ mdelay(1);
+ if (!time) {
+ dev_err(dev, "PIPE clk is not stable\n");
+ return false;
+ }
+ time--;
+ val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_STATE0_ADDR);
+ }
+
+ return true;
+}
+
+static int hi3670_pcie_noc_power(struct hi3670_pcie_phy *phy, bool enable)
+{
+ struct device *dev = phy->dev;
+ u32 time = NOC_POWER_TIME;
+ unsigned int val = NOC_PW_MASK;
+ int rst;
+
+ if (enable)
+ val = NOC_PW_MASK | NOC_PW_SET_BIT;
+ else
+ val = NOC_PW_MASK;
+ rst = enable ? 1 : 0;
+
+ regmap_write(phy->pmctrl, NOC_POWER_IDLEREQ_1, val);
+
+ time = NOC_POWER_TIME;
+ regmap_read(phy->pmctrl, NOC_POWER_IDLE_1, &val);
+ while ((val & NOC_PW_SET_BIT) != rst) {
+ udelay(10);
+ if (!time) {
+ dev_err(dev, "Failed to reverse noc power-status\n");
+ return -EINVAL;
+ }
+ time--;
+ regmap_read(phy->pmctrl, NOC_POWER_IDLE_1, &val);
+ }
+
+ return 0;
+}
+
+static int hi3670_pcie_get_resources_from_pcie(struct hi3670_pcie_phy *phy)
+{
+ struct device_node *pcie_port;
+ struct device *dev = phy->dev;
+ struct device *pcie_dev;
+
+ pcie_port = of_get_child_by_name(dev->parent->of_node, "pcie");
+ if (!pcie_port) {
+ dev_err(dev, "no pcie node found in %s\n",
+ dev->parent->of_node->full_name);
+ return -ENODEV;
+ }
+
+ pcie_dev = bus_find_device_by_of_node(&platform_bus_type, pcie_port);
+ if (!pcie_dev) {
+ dev_err(dev, "Didn't find pcie device\n");
+ return -ENODEV;
+ }
+
+ /*
+ * We might just use NULL instead of the APB name, as the
+ * pcie-kirin currently registers directly just one regmap (although
+ * the DWC driver register other regmaps).
+ *
+ * Yet, it sounds safer to warrant that it will be accessing the
+ * right regmap. So, let's use the named version.
+ */
+ phy->apb = dev_get_regmap(pcie_dev, "kirin_pcie_apb");
+ if (!phy->apb) {
+ dev_err(dev, "Failed to get APB regmap\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int kirin_pcie_clk_ctrl(struct hi3670_pcie_phy *phy, bool enable)
+{
+ int ret = 0;
+
+ if (!enable)
+ goto close_clk;
+
+ ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(phy->phy_ref_clk);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(phy->apb_sys_clk);
+ if (ret)
+ goto apb_sys_fail;
+
+ ret = clk_prepare_enable(phy->apb_phy_clk);
+ if (ret)
+ goto apb_phy_fail;
+
+ ret = clk_prepare_enable(phy->aclk);
+ if (ret)
+ goto aclk_fail;
+
+ ret = clk_prepare_enable(phy->aux_clk);
+ if (ret)
+ goto aux_clk_fail;
+
+ return 0;
+
+close_clk:
+ clk_disable_unprepare(phy->aux_clk);
+aux_clk_fail:
+ clk_disable_unprepare(phy->aclk);
+aclk_fail:
+ clk_disable_unprepare(phy->apb_phy_clk);
+apb_phy_fail:
+ clk_disable_unprepare(phy->apb_sys_clk);
+apb_sys_fail:
+ clk_disable_unprepare(phy->phy_ref_clk);
+
+ return ret;
+}
+
+static int hi3670_pcie_phy_init(struct phy *generic_phy)
+{
+ struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
+ int ret;
+
+ /*
+ * The code under hi3670_pcie_get_resources_from_pcie() need to
+ * access the reset-gpios and the APB registers, both from the
+ * pcie-kirin driver.
+ *
+ * The APB is obtained via the pcie driver's regmap
+ * Such kind of resource can only be obtained during the PCIe
+ * power_on sequence, as the code inside pcie-kirin needs to
+ * be already probed, as it needs to register the APB regmap.
+ */
+
+ ret = hi3670_pcie_get_resources_from_pcie(phy);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int hi3670_pcie_phy_power_on(struct phy *generic_phy)
+{
+ struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
+ int val, ret;
+
+ /* Power supply for Host */
+ regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
+ usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
+
+ hi3670_pcie_phy_oe_enable(phy, true);
+
+ ret = kirin_pcie_clk_ctrl(phy, true);
+ if (ret)
+ return ret;
+
+ /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
+ regmap_write(phy->sysctrl, SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
+ regmap_write(phy->crgctrl, CRGCTRL_PCIE_ASSERT_OFFSET,
+ CRGCTRL_PCIE_ASSERT_BIT);
+ regmap_write(phy->sysctrl, SCTRL_PCIE_HPCLK_OFFSET,
+ SCTRL_PCIE_HPCLK_BIT);
+
+ hi3670_pcie_natural_cfg(phy);
+
+ ret = hi3670_pcie_allclk_ctrl(phy, true);
+ if (ret)
+ goto disable_clks;
+
+ /* pull down phy_test_powerdown signal */
+ hi3670_apb_phy_updatel(phy, 0, PCIE_PULL_DOWN_PHY_TEST_POWERDOWN,
+ SOC_PCIEPHY_CTRL0_ADDR);
+
+ /* deassert controller perst_n */
+ regmap_read(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, &val);
+ val |= PCIE_DEASSERT_CONTROLLER_PERST;
+ regmap_write(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, val);
+ udelay(10);
+
+ ret = is_pipe_clk_stable(phy);
+ if (!ret)
+ goto disable_clks;
+
+ hi3670_pcie_set_eyeparam(phy);
+
+ ret = hi3670_pcie_noc_power(phy, false);
+ if (ret)
+ goto disable_clks;
+
+ return 0;
+
+disable_clks:
+ kirin_pcie_clk_ctrl(phy, false);
+ return ret;
+}
+
+static int hi3670_pcie_phy_power_off(struct phy *generic_phy)
+{
+ struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
+
+ hi3670_pcie_phy_oe_enable(phy, false);
+
+ hi3670_pcie_allclk_ctrl(phy, false);
+
+ /* Drop power supply for Host */
+ regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0);
+
+ /*
+ * FIXME: The enabled clocks should be disabled here by calling
+ * kirin_pcie_clk_ctrl(phy, false);
+ * However, some clocks used at Kirin 970 should be marked as
+ * CLK_IS_CRITICAL at clk-hi3670 driver, as powering such clocks off
+ * cause an Asynchronous SError interrupt, which produces panic().
+ * While clk-hi3670 is not fixed, we cannot risk disabling clocks here.
+ */
+
+ return 0;
+}
+
+static const struct phy_ops hi3670_phy_ops = {
+ .init = hi3670_pcie_phy_init,
+ .power_on = hi3670_pcie_phy_power_on,
+ .power_off = hi3670_pcie_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static int hi3670_pcie_phy_get_resources(struct hi3670_pcie_phy *phy,
+ struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ /* syscon */
+ phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-crgctrl");
+ if (IS_ERR(phy->crgctrl))
+ return PTR_ERR(phy->crgctrl);
+
+ phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-sctrl");
+ if (IS_ERR(phy->sysctrl))
+ return PTR_ERR(phy->sysctrl);
+
+ phy->pmctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-pmctrl");
+ if (IS_ERR(phy->sysctrl))
+ return PTR_ERR(phy->sysctrl);
+
+ /* clocks */
+ phy->phy_ref_clk = devm_clk_get(dev, "phy_ref");
+ if (IS_ERR(phy->phy_ref_clk))
+ return PTR_ERR(phy->phy_ref_clk);
+
+ phy->aux_clk = devm_clk_get(dev, "aux");
+ if (IS_ERR(phy->aux_clk))
+ return PTR_ERR(phy->aux_clk);
+
+ phy->apb_phy_clk = devm_clk_get(dev, "apb_phy");
+ if (IS_ERR(phy->apb_phy_clk))
+ return PTR_ERR(phy->apb_phy_clk);
+
+ phy->apb_sys_clk = devm_clk_get(dev, "apb_sys");
+ if (IS_ERR(phy->apb_sys_clk))
+ return PTR_ERR(phy->apb_sys_clk);
+
+ phy->aclk = devm_clk_get(dev, "aclk");
+ if (IS_ERR(phy->aclk))
+ return PTR_ERR(phy->aclk);
+
+ /* registers */
+ phy->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(phy->base))
+ return PTR_ERR(phy->base);
+
+ hi3670_pcie_get_eyeparam(phy);
+
+ return 0;
+}
+
+static int hi3670_pcie_phy_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ struct device *dev = &pdev->dev;
+ struct hi3670_pcie_phy *phy;
+ struct phy *generic_phy;
+ int ret;
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->dev = dev;
+
+ ret = hi3670_pcie_phy_get_resources(phy, pdev);
+ if (ret)
+ return ret;
+
+ generic_phy = devm_phy_create(dev, dev->of_node, &hi3670_phy_ops);
+ if (IS_ERR(generic_phy)) {
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(generic_phy);
+ }
+
+ phy_set_drvdata(generic_phy, phy);
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id hi3670_pcie_phy_match[] = {
+ {
+ .compatible = "hisilicon,hi970-pcie-phy",
+ },
+ {},
+};
+
+static struct platform_driver hi3670_pcie_phy_driver = {
+ .probe = hi3670_pcie_phy_probe,
+ .driver = {
+ .of_match_table = hi3670_pcie_phy_match,
+ .name = "hi3670_pcie_phy",
+ .suppress_bind_attrs = true,
+ }
+};
+builtin_platform_driver(hi3670_pcie_phy_driver);
+
+MODULE_DEVICE_TABLE(of, hi3670_pcie_phy_match);
+MODULE_DESCRIPTION("PCIe phy driver for Kirin 970");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
+MODULE_AUTHOR("Manivannan Sadhasivam <mani@kernel.org>");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff