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Subject[PATCH v5 1/3] phy: add driver for Qualcomm IPQ40xx USB PHY
Date
From: John Crispin <john@phrozen.org>

Add a driver to setup the USB phy on Qualcom Dakota 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>
---
Changes from v2 to v3:
* Remove magic writes as they are not needed
* Correct commit message

drivers/phy/qualcomm/Kconfig | 7 +
drivers/phy/qualcomm/Makefile | 1 +
drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c | 152 ++++++++++++++++++++
3 files changed, 160 insertions(+)
create mode 100644 drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c

diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
index e46824da29f6..964bd5d784d2 100644
--- 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 module"
+ depends on OF && ARCH_QCOM
+ select GENERIC_PHY
+ help
+ Support for the USB PHY on QCOM IPQ4019/Dakota chipsets.
+
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 283251d6a5d9..8afe6c4f5178 100644
--- 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
index 000000000000..7efebae6b6fd
--- /dev/null
+++ b/drivers/phy/qualcomm/phy-qcom-ipq4019-usb.c
@@ -0,0 +1,152 @@
+// 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/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;
+ const struct of_device_id *match;
+
+ match = of_match_device(ipq4019_usb_phy_of_match, &pdev->dev);
+ if (!match)
+ return -ENODEV;
+
+ 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, match->data);
+ 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");
--
2.26.0
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