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