1 files changed, 317 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
new file mode 100644
index 0000000000..d4fb85c20e
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -0,0 +1,317 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023, Linaro Limited
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+
+/* eUSB2 status registers */
+#define EUSB2_RPTR_STATUS		0x08
+#define	RPTR_OK				BIT(7)
+
+/* eUSB2 control registers */
+#define EUSB2_EN_CTL1			0x46
+#define EUSB2_RPTR_EN			BIT(7)
+
+#define EUSB2_FORCE_EN_5		0xe8
+#define F_CLK_19P2M_EN			BIT(6)
+
+#define EUSB2_FORCE_VAL_5		0xeD
+#define V_CLK_19P2M_EN			BIT(6)
+
+#define EUSB2_TUNE_USB2_CROSSOVER	0x50
+#define EUSB2_TUNE_IUSB2		0x51
+#define EUSB2_TUNE_RES_FSDIF		0x52
+#define EUSB2_TUNE_HSDISC		0x53
+#define EUSB2_TUNE_SQUELCH_U		0x54
+#define EUSB2_TUNE_USB2_SLEW		0x55
+#define EUSB2_TUNE_USB2_EQU		0x56
+#define EUSB2_TUNE_USB2_PREEM		0x57
+#define EUSB2_TUNE_USB2_HS_COMP_CUR	0x58
+#define EUSB2_TUNE_EUSB_SLEW		0x59
+#define EUSB2_TUNE_EUSB_EQU		0x5A
+#define EUSB2_TUNE_EUSB_HS_COMP_CUR	0x5B
+
+#define QCOM_EUSB2_REPEATER_INIT_CFG(r, v)	\
+	{					\
+		.reg = r,			\
+		.val = v,			\
+	}
+
+enum reg_fields {
+	F_TUNE_EUSB_HS_COMP_CUR,
+	F_TUNE_EUSB_EQU,
+	F_TUNE_EUSB_SLEW,
+	F_TUNE_USB2_HS_COMP_CUR,
+	F_TUNE_USB2_PREEM,
+	F_TUNE_USB2_EQU,
+	F_TUNE_USB2_SLEW,
+	F_TUNE_SQUELCH_U,
+	F_TUNE_HSDISC,
+	F_TUNE_RES_FSDIF,
+	F_TUNE_IUSB2,
+	F_TUNE_USB2_CROSSOVER,
+	F_NUM_TUNE_FIELDS,
+
+	F_FORCE_VAL_5 = F_NUM_TUNE_FIELDS,
+	F_FORCE_EN_5,
+
+	F_EN_CTL1,
+
+	F_RPTR_STATUS,
+	F_NUM_FIELDS,
+};
+
+static struct reg_field eusb2_repeater_tune_reg_fields[F_NUM_FIELDS] = {
+	[F_TUNE_EUSB_HS_COMP_CUR] = REG_FIELD(EUSB2_TUNE_EUSB_HS_COMP_CUR, 0, 1),
+	[F_TUNE_EUSB_EQU] = REG_FIELD(EUSB2_TUNE_EUSB_EQU, 0, 1),
+	[F_TUNE_EUSB_SLEW] = REG_FIELD(EUSB2_TUNE_EUSB_SLEW, 0, 1),
+	[F_TUNE_USB2_HS_COMP_CUR] = REG_FIELD(EUSB2_TUNE_USB2_HS_COMP_CUR, 0, 1),
+	[F_TUNE_USB2_PREEM] = REG_FIELD(EUSB2_TUNE_USB2_PREEM, 0, 2),
+	[F_TUNE_USB2_EQU] = REG_FIELD(EUSB2_TUNE_USB2_EQU, 0, 1),
+	[F_TUNE_USB2_SLEW] = REG_FIELD(EUSB2_TUNE_USB2_SLEW, 0, 1),
+	[F_TUNE_SQUELCH_U] = REG_FIELD(EUSB2_TUNE_SQUELCH_U, 0, 2),
+	[F_TUNE_HSDISC] = REG_FIELD(EUSB2_TUNE_HSDISC, 0, 2),
+	[F_TUNE_RES_FSDIF] = REG_FIELD(EUSB2_TUNE_RES_FSDIF, 0, 2),
+	[F_TUNE_IUSB2] = REG_FIELD(EUSB2_TUNE_IUSB2, 0, 3),
+	[F_TUNE_USB2_CROSSOVER] = REG_FIELD(EUSB2_TUNE_USB2_CROSSOVER, 0, 2),
+
+	[F_FORCE_VAL_5] = REG_FIELD(EUSB2_FORCE_VAL_5, 0, 7),
+	[F_FORCE_EN_5] = REG_FIELD(EUSB2_FORCE_EN_5, 0, 7),
+
+	[F_EN_CTL1] = REG_FIELD(EUSB2_EN_CTL1, 0, 7),
+
+	[F_RPTR_STATUS] = REG_FIELD(EUSB2_RPTR_STATUS, 0, 7),
+};
+
+struct eusb2_repeater_cfg {
+	const u32 *init_tbl;
+	int init_tbl_num;
+	const char * const *vreg_list;
+	int num_vregs;
+};
+
+struct eusb2_repeater {
+	struct device *dev;
+	struct regmap_field *regs[F_NUM_FIELDS];
+	struct phy *phy;
+	struct regulator_bulk_data *vregs;
+	const struct eusb2_repeater_cfg *cfg;
+	enum phy_mode mode;
+};
+
+static const char * const pm8550b_vreg_l[] = {
+	"vdd18", "vdd3",
+};
+
+static const u32 pm8550b_init_tbl[F_NUM_TUNE_FIELDS] = {
+	[F_TUNE_IUSB2] = 0x8,
+	[F_TUNE_SQUELCH_U] = 0x3,
+	[F_TUNE_USB2_PREEM] = 0x5,
+};
+
+static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
+	.init_tbl	= pm8550b_init_tbl,
+	.init_tbl_num	= ARRAY_SIZE(pm8550b_init_tbl),
+	.vreg_list	= pm8550b_vreg_l,
+	.num_vregs	= ARRAY_SIZE(pm8550b_vreg_l),
+};
+
+static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr)
+{
+	int num = rptr->cfg->num_vregs;
+	struct device *dev = rptr->dev;
+	int i;
+
+	rptr->vregs = devm_kcalloc(dev, num, sizeof(*rptr->vregs), GFP_KERNEL);
+	if (!rptr->vregs)
+		return -ENOMEM;
+
+	for (i = 0; i < num; i++)
+		rptr->vregs[i].supply = rptr->cfg->vreg_list[i];
+
+	return devm_regulator_bulk_get(dev, num, rptr->vregs);
+}
+
+static int eusb2_repeater_init(struct phy *phy)
+{
+	struct reg_field *regfields = eusb2_repeater_tune_reg_fields;
+	struct eusb2_repeater *rptr = phy_get_drvdata(phy);
+	const u32 *init_tbl = rptr->cfg->init_tbl;
+	u32 val;
+	int ret;
+	int i;
+
+	ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
+	if (ret)
+		return ret;
+
+	regmap_field_update_bits(rptr->regs[F_EN_CTL1], EUSB2_RPTR_EN, EUSB2_RPTR_EN);
+
+	for (i = 0; i < F_NUM_TUNE_FIELDS; i++) {
+		if (init_tbl[i]) {
+			regmap_field_update_bits(rptr->regs[i], init_tbl[i], init_tbl[i]);
+		} else {
+			/* Write 0 if there's no value set */
+			u32 mask = GENMASK(regfields[i].msb, regfields[i].lsb);
+
+			regmap_field_update_bits(rptr->regs[i], mask, 0);
+		}
+	}
+
+	ret = regmap_field_read_poll_timeout(rptr->regs[F_RPTR_STATUS],
+					     val, val & RPTR_OK, 10, 5);
+	if (ret)
+		dev_err(rptr->dev, "initialization timed-out\n");
+
+	return ret;
+}
+
+static int eusb2_repeater_set_mode(struct phy *phy,
+				   enum phy_mode mode, int submode)
+{
+	struct eusb2_repeater *rptr = phy_get_drvdata(phy);
+
+	switch (mode) {
+	case PHY_MODE_USB_HOST:
+		/*
+		 * CM.Lx is prohibited when repeater is already into Lx state as
+		 * per eUSB 1.2 Spec. Below implement software workaround until
+		 * PHY and controller is fixing seen observation.
+		 */
+		regmap_field_update_bits(rptr->regs[F_FORCE_EN_5],
+					 F_CLK_19P2M_EN, F_CLK_19P2M_EN);
+		regmap_field_update_bits(rptr->regs[F_FORCE_VAL_5],
+					 V_CLK_19P2M_EN, V_CLK_19P2M_EN);
+		break;
+	case PHY_MODE_USB_DEVICE:
+		/*
+		 * In device mode clear host mode related workaround as there
+		 * is no repeater reset available, and enable/disable of
+		 * repeater doesn't clear previous value due to shared
+		 * regulators (say host <-> device mode switch).
+		 */
+		regmap_field_update_bits(rptr->regs[F_FORCE_EN_5],
+					 F_CLK_19P2M_EN, 0);
+		regmap_field_update_bits(rptr->regs[F_FORCE_VAL_5],
+					 V_CLK_19P2M_EN, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int eusb2_repeater_exit(struct phy *phy)
+{
+	struct eusb2_repeater *rptr = phy_get_drvdata(phy);
+
+	return regulator_bulk_disable(rptr->cfg->num_vregs, rptr->vregs);
+}
+
+static const struct phy_ops eusb2_repeater_ops = {
+	.init		= eusb2_repeater_init,
+	.exit		= eusb2_repeater_exit,
+	.set_mode	= eusb2_repeater_set_mode,
+	.owner		= THIS_MODULE,
+};
+
+static int eusb2_repeater_probe(struct platform_device *pdev)
+{
+	struct eusb2_repeater *rptr;
+	struct device *dev = &pdev->dev;
+	struct phy_provider *phy_provider;
+	struct device_node *np = dev->of_node;
+	struct regmap *regmap;
+	int i, ret;
+	u32 res;
+
+	rptr = devm_kzalloc(dev, sizeof(*rptr), GFP_KERNEL);
+	if (!rptr)
+		return -ENOMEM;
+
+	rptr->dev = dev;
+	dev_set_drvdata(dev, rptr);
+
+	rptr->cfg = of_device_get_match_data(dev);
+	if (!rptr->cfg)
+		return -EINVAL;
+
+	regmap = dev_get_regmap(dev->parent, NULL);
+	if (!regmap)
+		return -ENODEV;
+
+	ret = of_property_read_u32(np, "reg", &res);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < F_NUM_FIELDS; i++)
+		eusb2_repeater_tune_reg_fields[i].reg += res;
+
+	ret = devm_regmap_field_bulk_alloc(dev, regmap, rptr->regs,
+					   eusb2_repeater_tune_reg_fields,
+					   F_NUM_FIELDS);
+	if (ret)
+		return ret;
+
+	ret = eusb2_repeater_init_vregs(rptr);
+	if (ret < 0) {
+		dev_err(dev, "unable to get supplies\n");
+		return ret;
+	}
+
+	rptr->phy = devm_phy_create(dev, np, &eusb2_repeater_ops);
+	if (IS_ERR(rptr->phy)) {
+		dev_err(dev, "failed to create PHY: %d\n", ret);
+		return PTR_ERR(rptr->phy);
+	}
+
+	phy_set_drvdata(rptr->phy, rptr);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR(phy_provider))
+		return PTR_ERR(phy_provider);
+
+	dev_info(dev, "Registered Qcom-eUSB2 repeater\n");
+
+	return 0;
+}
+
+static void eusb2_repeater_remove(struct platform_device *pdev)
+{
+	struct eusb2_repeater *rptr = platform_get_drvdata(pdev);
+
+	if (!rptr)
+		return;
+
+	eusb2_repeater_exit(rptr->phy);
+}
+
+static const struct of_device_id eusb2_repeater_of_match_table[] = {
+	{
+		.compatible = "qcom,pm8550b-eusb2-repeater",
+		.data = &pm8550b_eusb2_cfg,
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, eusb2_repeater_of_match_table);
+
+static struct platform_driver eusb2_repeater_driver = {
+	.probe		= eusb2_repeater_probe,
+	.remove_new	= eusb2_repeater_remove,
+	.driver = {
+		.name	= "qcom-eusb2-repeater",
+		.of_match_table = eusb2_repeater_of_match_table,
+	},
+};
+
+module_platform_driver(eusb2_repeater_driver);
+
+MODULE_DESCRIPTION("Qualcomm PMIC eUSB2 Repeater driver");
+MODULE_LICENSE("GPL");