// 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
enum eusb2_reg_layout {
TUNE_EUSB_HS_COMP_CUR,
TUNE_EUSB_EQU,
TUNE_EUSB_SLEW,
TUNE_USB2_HS_COMP_CUR,
TUNE_USB2_PREEM,
TUNE_USB2_EQU,
TUNE_USB2_SLEW,
TUNE_SQUELCH_U,
TUNE_HSDISC,
TUNE_RES_FSDIF,
TUNE_IUSB2,
TUNE_USB2_CROSSOVER,
NUM_TUNE_FIELDS,
FORCE_VAL_5 = NUM_TUNE_FIELDS,
FORCE_EN_5,
EN_CTL1,
RPTR_STATUS,
LAYOUT_SIZE,
};
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 *regmap;
struct phy *phy;
struct regulator_bulk_data *vregs;
const struct eusb2_repeater_cfg *cfg;
u32 base;
enum phy_mode mode;
};
static const char * const pm8550b_vreg_l[] = {
"vdd18", "vdd3",
};
static const u32 pm8550b_init_tbl[NUM_TUNE_FIELDS] = {
[TUNE_IUSB2] = 0x8,
[TUNE_SQUELCH_U] = 0x3,
[TUNE_USB2_PREEM] = 0x5,
};
static const u32 smb2360_init_tbl[NUM_TUNE_FIELDS] = {
[TUNE_IUSB2] = 0x5,
[TUNE_SQUELCH_U] = 0x3,
[TUNE_USB2_PREEM] = 0x2,
};
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 const struct eusb2_repeater_cfg smb2360_eusb2_cfg = {
.init_tbl = smb2360_init_tbl,
.init_tbl_num = ARRAY_SIZE(smb2360_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 eusb2_repeater *rptr = phy_get_drvdata(phy);
struct device_node *np = rptr->dev->of_node;
struct regmap *regmap = rptr->regmap;
const u32 *init_tbl = rptr->cfg->init_tbl;
u8 tune_usb2_preem = init_tbl[TUNE_USB2_PREEM];
u8 tune_hsdisc = init_tbl[TUNE_HSDISC];
u8 tune_iusb2 = init_tbl[TUNE_IUSB2];
u32 base = rptr->base;
u32 val;
int ret;
of_property_read_u8(np, "qcom,tune-usb2-amplitude", &tune_iusb2);
of_property_read_u8(np, "qcom,tune-usb2-disc-thres", &tune_hsdisc);
of_property_read_u8(np, "qcom,tune-usb2-preem", &tune_usb2_preem);
ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
if (ret)
return ret;
regmap_write(regmap, base + EUSB2_EN_CTL1, EUSB2_RPTR_EN);
regmap_write(regmap, base + EUSB2_TUNE_EUSB_HS_COMP_CUR, init_tbl[TUNE_EUSB_HS_COMP_CUR]);
regmap_write(regmap, base + EUSB2_TUNE_EUSB_EQU, init_tbl[TUNE_EUSB_EQU]);
regmap_write(regmap, base + EUSB2_TUNE_EUSB_SLEW, init_tbl[TUNE_EUSB_SLEW]);
regmap_write(regmap, base + EUSB2_TUNE_USB2_HS_COMP_CUR, init_tbl[TUNE_USB2_HS_COMP_CUR]);
regmap_write(regmap, base + EUSB2_TUNE_USB2_EQU, init_tbl[TUNE_USB2_EQU]);
regmap_write(regmap, base + EUSB2_TUNE_USB2_SLEW, init_tbl[TUNE_USB2_SLEW]);
regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, init_tbl[TUNE_SQUELCH_U]);
regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, init_tbl[TUNE_RES_FSDIF]);
regmap_write(regmap, base + EUSB2_TUNE_USB2_CROSSOVER, init_tbl[TUNE_USB2_CROSSOVER]);
regmap_write(regmap, base + EUSB2_TUNE_USB2_PREEM, tune_usb2_preem);
regmap_write(regmap, base + EUSB2_TUNE_HSDISC, tune_hsdisc);
regmap_write(regmap, base + EUSB2_TUNE_IUSB2, tune_iusb2);
ret = regmap_read_poll_timeout(regmap, base + EUSB2_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);
struct regmap *regmap = rptr->regmap;
u32 base = rptr->base;
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_write(regmap, base + EUSB2_FORCE_EN_5, F_CLK_19P2M_EN);
regmap_write(regmap, base + EUSB2_FORCE_VAL_5, 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_write(regmap, base + EUSB2_FORCE_EN_5, 0);
regmap_write(regmap, base + EUSB2_FORCE_VAL_5, 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;
u32 res;
int ret;
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;
rptr->regmap = dev_get_regmap(dev->parent, NULL);
if (!rptr->regmap)
return -ENODEV;
ret = of_property_read_u32(np, "reg", &res);
if (ret < 0)
return ret;
rptr->base = res;
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,
},
{
.compatible = "qcom,smb2360-eusb2-repeater",
.data = &smb2360_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");
Codebase Browser
linux