phy: add driver for Qualcomm IPQ40xx USB PHY

Add a driver to setup the USB PHY-s on Qualcom m IPQ40xx series SoCs.
The driver sets up HS and SS phys.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Link: https://lore.kernel.org/r/20200503201823.531757-1-robert.marko@sartura.hr
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
index 98674ed..b86f955 100644 (file)
--- a/drivers/phy/qualcomm/Kconfig
+++ b/drivers/phy/qualcomm/Kconfig
@@ -18,6 +18,13 @@ config PHY_QCOM_APQ8064_SATA
        depends on OF
        select GENERIC_PHY
 
+config PHY_QCOM_IPQ4019_USB
+       tristate "Qualcomm IPQ4019 USB PHY driver"
+       depends on OF && (ARCH_QCOM || COMPILE_TEST)
+       select GENERIC_PHY
+       help
+         Support for the USB PHY-s on Qualcomm IPQ40xx SoC-s.
+
 config PHY_QCOM_IPQ806X_SATA
        tristate "Qualcomm IPQ806x SATA SerDes/PHY driver"
        depends on ARCH_QCOM

diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
index 1f14aea..4174678 100644 (file)
--- a/drivers/phy/qualcomm/Makefile
+++ b/drivers/phy/qualcomm/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_PHY_ATH79_USB)            += phy-ath79-usb.o
 obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)    += phy-qcom-apq8064-sata.o
+obj-$(CONFIG_PHY_QCOM_IPQ4019_USB)     += phy-qcom-ipq4019-usb.o
 obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)    += phy-qcom-ipq806x-sata.o
 obj-$(CONFIG_PHY_QCOM_PCIE2)           += phy-qcom-pcie2.o
 obj-$(CONFIG_PHY_QCOM_QMP)             += phy-qcom-qmp.o

diff --git a/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c b/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c
new file mode 100644 (file)
index 0000000..b8ef331
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c
@@ -0,0 +1,148 @@
+// 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_platform.h>
+#include <linux/of_device.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 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 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 resource *res;
+       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;
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       phy->base = devm_ioremap_resource(&pdev->dev, res);
+       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");