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path: root/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
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Diffstat (limited to 'drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c')
-rw-r--r--drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c317
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");