diff options
Diffstat (limited to 'drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c')
| -rw-r--r-- | drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c b/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c new file mode 100644 index 0000000000..da6f290af7 --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2018 John Crispin <john@phrozen.org> + * + * Based on code from + * Allwinner Technology Co., Ltd. <www.allwinnertech.com> + * + */ + +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/reset.h> + +struct ipq4019_usb_phy { + struct device *dev; + struct phy *phy; + void __iomem *base; + struct reset_control *por_rst; + struct reset_control *srif_rst; +}; + +static int ipq4019_ss_phy_power_off(struct phy *_phy) +{ + struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy); + + reset_control_assert(phy->por_rst); + msleep(10); + + return 0; +} + +static int ipq4019_ss_phy_power_on(struct phy *_phy) +{ + struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy); + + ipq4019_ss_phy_power_off(_phy); + + reset_control_deassert(phy->por_rst); + + return 0; +} + +static const struct phy_ops ipq4019_usb_ss_phy_ops = { + .power_on = ipq4019_ss_phy_power_on, + .power_off = ipq4019_ss_phy_power_off, +}; + +static int ipq4019_hs_phy_power_off(struct phy *_phy) +{ + struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy); + + reset_control_assert(phy->por_rst); + msleep(10); + + reset_control_assert(phy->srif_rst); + msleep(10); + + return 0; +} + +static int ipq4019_hs_phy_power_on(struct phy *_phy) +{ + struct ipq4019_usb_phy *phy = phy_get_drvdata(_phy); + + ipq4019_hs_phy_power_off(_phy); + + reset_control_deassert(phy->srif_rst); + msleep(10); + + reset_control_deassert(phy->por_rst); + + return 0; +} + +static const struct phy_ops ipq4019_usb_hs_phy_ops = { + .power_on = ipq4019_hs_phy_power_on, + .power_off = ipq4019_hs_phy_power_off, +}; + +static const struct of_device_id ipq4019_usb_phy_of_match[] = { + { .compatible = "qcom,usb-hs-ipq4019-phy", .data = &ipq4019_usb_hs_phy_ops}, + { .compatible = "qcom,usb-ss-ipq4019-phy", .data = &ipq4019_usb_ss_phy_ops}, + { }, +}; +MODULE_DEVICE_TABLE(of, ipq4019_usb_phy_of_match); + +static int ipq4019_usb_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy_provider *phy_provider; + struct ipq4019_usb_phy *phy; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + phy->dev = &pdev->dev; + phy->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(phy->base)) { + dev_err(dev, "failed to remap register memory\n"); + return PTR_ERR(phy->base); + } + + phy->por_rst = devm_reset_control_get(phy->dev, "por_rst"); + if (IS_ERR(phy->por_rst)) { + if (PTR_ERR(phy->por_rst) != -EPROBE_DEFER) + dev_err(dev, "POR reset is missing\n"); + return PTR_ERR(phy->por_rst); + } + + phy->srif_rst = devm_reset_control_get_optional(phy->dev, "srif_rst"); + if (IS_ERR(phy->srif_rst)) + return PTR_ERR(phy->srif_rst); + + phy->phy = devm_phy_create(dev, NULL, of_device_get_match_data(dev)); + if (IS_ERR(phy->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(phy->phy); + } + phy_set_drvdata(phy->phy, phy); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static struct platform_driver ipq4019_usb_phy_driver = { + .probe = ipq4019_usb_phy_probe, + .driver = { + .of_match_table = ipq4019_usb_phy_of_match, + .name = "ipq4019-usb-phy", + } +}; +module_platform_driver(ipq4019_usb_phy_driver); + +MODULE_DESCRIPTION("QCOM/IPQ4019 USB phy driver"); +MODULE_AUTHOR("John Crispin <john@phrozen.org>"); +MODULE_LICENSE("GPL v2"); |