diff options
Diffstat (limited to 'drivers/phy/phy-qcom-usb-hsic.c')
| -rw-r--r-- | drivers/phy/phy-qcom-usb-hsic.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/phy/phy-qcom-usb-hsic.c b/drivers/phy/phy-qcom-usb-hsic.c new file mode 100644 index 000000000000..47690f9945b9 --- /dev/null +++ b/drivers/phy/phy-qcom-usb-hsic.c @@ -0,0 +1,160 @@ +/** + * Copyright (C) 2016 Linaro Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/module.h> +#include <linux/ulpi/driver.h> +#include <linux/ulpi/regs.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/pinctrl-state.h> +#include <linux/delay.h> +#include <linux/clk.h> + +#include "ulpi_phy.h" + +#define ULPI_HSIC_CFG 0x30 +#define ULPI_HSIC_IO_CAL 0x33 + +struct qcom_usb_hsic_phy { + struct ulpi *ulpi; + struct phy *phy; + struct pinctrl *pctl; + struct clk *phy_clk; + struct clk *cal_clk; + struct clk *cal_sleep_clk; +}; + +static int qcom_usb_hsic_phy_power_on(struct phy *phy) +{ + struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy); + struct ulpi *ulpi = uphy->ulpi; + struct pinctrl_state *pins_default; + int ret; + + ret = clk_prepare_enable(uphy->phy_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(uphy->cal_clk); + if (ret) + goto err_cal; + + ret = clk_prepare_enable(uphy->cal_sleep_clk); + if (ret) + goto err_sleep; + + /* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */ + ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff); + if (ret) + goto err_ulpi; + + /* Enable periodic IO calibration in HSIC_CFG register */ + ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8); + if (ret) + goto err_ulpi; + + /* Configure pins for HSIC functionality */ + pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT); + if (IS_ERR(pins_default)) + return PTR_ERR(pins_default); + + ret = pinctrl_select_state(uphy->pctl, pins_default); + if (ret) + goto err_ulpi; + + /* Enable HSIC mode in HSIC_CFG register */ + ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01); + if (ret) + goto err_ulpi; + + /* Disable auto-resume */ + ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL), + ULPI_IFC_CTRL_AUTORESUME); + if (ret) + goto err_ulpi; + + return ret; +err_ulpi: + clk_disable_unprepare(uphy->cal_sleep_clk); +err_sleep: + clk_disable_unprepare(uphy->cal_clk); +err_cal: + clk_disable_unprepare(uphy->phy_clk); + return ret; +} + +static int qcom_usb_hsic_phy_power_off(struct phy *phy) +{ + struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy); + + clk_disable_unprepare(uphy->cal_sleep_clk); + clk_disable_unprepare(uphy->cal_clk); + clk_disable_unprepare(uphy->phy_clk); + + return 0; +} + +static const struct phy_ops qcom_usb_hsic_phy_ops = { + .power_on = qcom_usb_hsic_phy_power_on, + .power_off = qcom_usb_hsic_phy_power_off, + .owner = THIS_MODULE, +}; + +static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi) +{ + struct qcom_usb_hsic_phy *uphy; + struct phy_provider *p; + struct clk *clk; + + uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL); + if (!uphy) + return -ENOMEM; + ulpi_set_drvdata(ulpi, uphy); + + uphy->ulpi = ulpi; + uphy->pctl = devm_pinctrl_get(&ulpi->dev); + if (IS_ERR(uphy->pctl)) + return PTR_ERR(uphy->pctl); + + uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node, + &qcom_usb_hsic_phy_ops); + if (IS_ERR(uphy->phy)) + return PTR_ERR(uphy->phy); + phy_set_drvdata(uphy->phy, uphy); + + p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate); + return PTR_ERR_OR_ZERO(p); +} + +static const struct of_device_id qcom_usb_hsic_phy_match[] = { + { .compatible = "qcom,usb-hsic-phy", }, + { } +}; +MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match); + +static struct ulpi_driver qcom_usb_hsic_phy_driver = { + .probe = qcom_usb_hsic_phy_probe, + .driver = { + .name = "qcom_usb_hsic_phy", + .of_match_table = qcom_usb_hsic_phy_match, + }, +}; +module_ulpi_driver(qcom_usb_hsic_phy_driver); + +MODULE_DESCRIPTION("Qualcomm USB HSIC phy"); +MODULE_LICENSE("GPL v2"); |