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path: root/drivers/phy/qualcomm/phy-qcom-usb-hsic.c
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Diffstat (limited to 'drivers/phy/qualcomm/phy-qcom-usb-hsic.c')
-rw-r--r--drivers/phy/qualcomm/phy-qcom-usb-hsic.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-usb-hsic.c b/drivers/phy/qualcomm/phy-qcom-usb-hsic.c
new file mode 100644
index 000000000000..c110563a73cb
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-usb-hsic.c
@@ -0,0 +1,159 @@
+/**
+ * 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/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/pinctrl-state.h>
+#include <linux/delay.h>
+#include <linux/clk.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");