1 From 364532aeb9024d0ff7b88121f9a953f559b1c136 Mon Sep 17 00:00:00 2001
2 From: "Ivan T. Ivanov" <iivanov@mm-sol.com>
3 Date: Mon, 7 Oct 2013 10:44:57 +0300
4 Subject: [PATCH 156/182] usb: dwc3: Add Qualcomm DWC3 glue layer driver
6 DWC3 glue layer is hardware layer around Synopsys DesignWare
7 USB3 core. Its purpose is to supply Synopsys IP with required
8 clocks, voltages and interface it with the rest of the SoC.
10 Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
12 drivers/usb/dwc3/Kconfig | 8 +++
13 drivers/usb/dwc3/Makefile | 1 +
14 drivers/usb/dwc3/dwc3-qcom.c | 156 ++++++++++++++++++++++++++++++++++++++++++
15 3 files changed, 165 insertions(+)
16 create mode 100644 drivers/usb/dwc3/dwc3-qcom.c
18 diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
19 index e2c730f..2d01983 100644
20 --- a/drivers/usb/dwc3/Kconfig
21 +++ b/drivers/usb/dwc3/Kconfig
22 @@ -59,6 +59,14 @@ config USB_DWC3_EXYNOS
23 Recent Exynos5 SoCs ship with one DesignWare Core USB3 IP inside,
24 say 'Y' or 'M' if you have one such device.
27 + tristate "Qualcomm Platforms"
29 + select USB_QCOM_DWC3_PHYS
31 + Recent Qualcomm SoCs ship with one DesignWare Core USB3 IP inside,
32 + say 'Y' or 'M' if you have one such device.
35 tristate "PCIe-based Platforms"
37 diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
38 index 10ac3e7..4066e4e 100644
39 --- a/drivers/usb/dwc3/Makefile
40 +++ b/drivers/usb/dwc3/Makefile
41 @@ -31,5 +31,6 @@ endif
43 obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o
44 obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o
45 +obj-$(CONFIG_USB_DWC3_QCOM) += dwc3-qcom.o
46 obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o
47 obj-$(CONFIG_USB_DWC3_KEYSTONE) += dwc3-keystone.o
48 diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
50 index 0000000..8d17360
52 +++ b/drivers/usb/dwc3/dwc3-qcom.c
54 +/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
56 + * This program is free software; you can redistribute it and/or modify
57 + * it under the terms of the GNU General Public License version 2 and
58 + * only version 2 as published by the Free Software Foundation.
60 + * This program is distributed in the hope that it will be useful,
61 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
62 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
63 + * GNU General Public License for more details.
66 +#include <linux/clk.h>
67 +#include <linux/err.h>
68 +#include <linux/io.h>
69 +#include <linux/module.h>
70 +#include <linux/of.h>
71 +#include <linux/of_platform.h>
72 +#include <linux/platform_device.h>
73 +#include <linux/regulator/consumer.h>
74 +#include <linux/usb/phy.h>
82 + struct clk *core_clk;
83 + struct clk *iface_clk;
84 + struct clk *sleep_clk;
86 + struct regulator *gdsc;
89 +static int dwc3_qcom_probe(struct platform_device *pdev)
91 + struct device_node *node = pdev->dev.of_node;
92 + struct dwc3_qcom *mdwc;
95 + mdwc = devm_kzalloc(&pdev->dev, sizeof(*mdwc), GFP_KERNEL);
99 + platform_set_drvdata(pdev, mdwc);
101 + mdwc->dev = &pdev->dev;
103 + mdwc->gdsc = devm_regulator_get(mdwc->dev, "gdsc");
105 + mdwc->core_clk = devm_clk_get(mdwc->dev, "core");
106 + if (IS_ERR(mdwc->core_clk)) {
107 + dev_dbg(mdwc->dev, "failed to get core clock\n");
108 + return PTR_ERR(mdwc->core_clk);
111 + mdwc->iface_clk = devm_clk_get(mdwc->dev, "iface");
112 + if (IS_ERR(mdwc->iface_clk)) {
113 + dev_dbg(mdwc->dev, "failed to get iface clock, skipping\n");
114 + mdwc->iface_clk = NULL;
117 + mdwc->sleep_clk = devm_clk_get(mdwc->dev, "sleep");
118 + if (IS_ERR(mdwc->sleep_clk)) {
119 + dev_dbg(mdwc->dev, "failed to get sleep clock, skipping\n");
120 + mdwc->sleep_clk = NULL;
123 + if (!IS_ERR(mdwc->gdsc)) {
124 + ret = regulator_enable(mdwc->gdsc);
126 + dev_err(mdwc->dev, "cannot enable gdsc\n");
129 + clk_prepare_enable(mdwc->core_clk);
131 + if (mdwc->iface_clk)
132 + clk_prepare_enable(mdwc->iface_clk);
134 + if (mdwc->sleep_clk)
135 + clk_prepare_enable(mdwc->sleep_clk);
137 + ret = of_platform_populate(node, NULL, NULL, mdwc->dev);
139 + dev_err(mdwc->dev, "failed to register core - %d\n", ret);
140 + dev_dbg(mdwc->dev, "failed to add create dwc3 core\n");
148 + dev_err(mdwc->dev, "disabling clocks\n");
150 + if (mdwc->sleep_clk)
151 + clk_disable_unprepare(mdwc->sleep_clk);
153 + if (mdwc->iface_clk)
154 + clk_disable_unprepare(mdwc->iface_clk);
156 + clk_disable_unprepare(mdwc->core_clk);
158 + if (!IS_ERR(mdwc->gdsc)) {
159 + ret = regulator_disable(mdwc->gdsc);
161 + dev_dbg(mdwc->dev, "cannot disable gdsc\n");
167 +static int dwc3_qcom_remove(struct platform_device *pdev)
171 + struct dwc3_qcom *mdwc = platform_get_drvdata(pdev);
173 + if (mdwc->sleep_clk)
174 + clk_disable_unprepare(mdwc->sleep_clk);
176 + if (mdwc->iface_clk)
177 + clk_disable_unprepare(mdwc->iface_clk);
179 + clk_disable_unprepare(mdwc->core_clk);
181 + if (!IS_ERR(mdwc->gdsc)) {
182 + ret = regulator_disable(mdwc->gdsc);
184 + dev_dbg(mdwc->dev, "cannot disable gdsc\n");
189 +static const struct of_device_id of_dwc3_match[] = {
190 + { .compatible = "qcom,dwc3" },
193 +MODULE_DEVICE_TABLE(of, of_dwc3_match);
195 +static struct platform_driver dwc3_qcom_driver = {
196 + .probe = dwc3_qcom_probe,
197 + .remove = dwc3_qcom_remove,
199 + .name = "qcom-dwc3",
200 + .owner = THIS_MODULE,
201 + .of_match_table = of_dwc3_match,
205 +module_platform_driver(dwc3_qcom_driver);
207 +MODULE_ALIAS("platform:qcom-dwc3");
208 +MODULE_LICENSE("GPL v2");
209 +MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer");