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WingMan Kwok943befc2013-12-12 12:25:29 -05001/**
2 * dwc3-keystone.c - Keystone Specific Glue layer
3 *
4 * Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Author: WingMan Kwok <w-kwok2@ti.com>
7 *
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 of
10 * the License as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/clk.h>
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/interrupt.h>
22#include <linux/platform_device.h>
23#include <linux/dma-mapping.h>
24#include <linux/io.h>
25#include <linux/of_platform.h>
26
27/* USBSS register offsets */
28#define USBSS_REVISION 0x0000
29#define USBSS_SYSCONFIG 0x0010
30#define USBSS_IRQ_EOI 0x0018
31#define USBSS_IRQSTATUS_RAW_0 0x0020
32#define USBSS_IRQSTATUS_0 0x0024
33#define USBSS_IRQENABLE_SET_0 0x0028
34#define USBSS_IRQENABLE_CLR_0 0x002c
35
36/* IRQ register bits */
37#define USBSS_IRQ_EOI_LINE(n) BIT(n)
38#define USBSS_IRQ_EVENT_ST BIT(0)
39#define USBSS_IRQ_COREIRQ_EN BIT(0)
40#define USBSS_IRQ_COREIRQ_CLR BIT(0)
41
WingMan Kwok943befc2013-12-12 12:25:29 -050042struct dwc3_keystone {
43 struct device *dev;
44 struct clk *clk;
45 void __iomem *usbss;
46};
47
48static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
49{
50 return readl(base + offset);
51}
52
53static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
54{
55 writel(value, base + offset);
56}
57
58static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
59{
60 u32 val;
61
62 val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
63 val |= USBSS_IRQ_COREIRQ_EN;
64 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
65}
66
67static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
68{
69 u32 val;
70
71 val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
72 val &= ~USBSS_IRQ_COREIRQ_EN;
73 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
74}
75
76static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
77{
78 struct dwc3_keystone *kdwc = _kdwc;
79
80 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
81 kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
82 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
83 kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
84
85 return IRQ_HANDLED;
86}
87
88static int kdwc3_probe(struct platform_device *pdev)
89{
90 struct device *dev = &pdev->dev;
91 struct device_node *node = pdev->dev.of_node;
92 struct dwc3_keystone *kdwc;
93 struct resource *res;
94 int error, irq;
95
96 kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
97 if (!kdwc)
98 return -ENOMEM;
99
100 platform_set_drvdata(pdev, kdwc);
101
102 kdwc->dev = dev;
103
104 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
WingMan Kwok943befc2013-12-12 12:25:29 -0500105 kdwc->usbss = devm_ioremap_resource(dev, res);
106 if (IS_ERR(kdwc->usbss))
107 return PTR_ERR(kdwc->usbss);
108
WingMan Kwok943befc2013-12-12 12:25:29 -0500109 kdwc->clk = devm_clk_get(kdwc->dev, "usb");
110
111 error = clk_prepare_enable(kdwc->clk);
112 if (error < 0) {
Felipe Balbi9ff0fdc2015-06-30 12:46:53 -0500113 dev_err(kdwc->dev, "unable to enable usb clock, error %d\n",
WingMan Kwok943befc2013-12-12 12:25:29 -0500114 error);
115 return error;
116 }
117
118 irq = platform_get_irq(pdev, 0);
119 if (irq < 0) {
120 dev_err(&pdev->dev, "missing irq\n");
Julia Lawall62c60692014-11-20 18:33:58 +0100121 error = irq;
WingMan Kwok943befc2013-12-12 12:25:29 -0500122 goto err_irq;
123 }
124
125 error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
126 dev_name(dev), kdwc);
127 if (error) {
128 dev_err(dev, "failed to request IRQ #%d --> %d\n",
129 irq, error);
130 goto err_irq;
131 }
132
133 kdwc3_enable_irqs(kdwc);
134
135 error = of_platform_populate(node, NULL, NULL, dev);
136 if (error) {
137 dev_err(&pdev->dev, "failed to create dwc3 core\n");
138 goto err_core;
139 }
140
141 return 0;
142
143err_core:
144 kdwc3_disable_irqs(kdwc);
145err_irq:
146 clk_disable_unprepare(kdwc->clk);
147
148 return error;
149}
150
151static int kdwc3_remove_core(struct device *dev, void *c)
152{
153 struct platform_device *pdev = to_platform_device(dev);
154
155 platform_device_unregister(pdev);
156
157 return 0;
158}
159
160static int kdwc3_remove(struct platform_device *pdev)
161{
162 struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
163
164 kdwc3_disable_irqs(kdwc);
165 device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
166 clk_disable_unprepare(kdwc->clk);
167 platform_set_drvdata(pdev, NULL);
168
169 return 0;
170}
171
172static const struct of_device_id kdwc3_of_match[] = {
173 { .compatible = "ti,keystone-dwc3", },
174 {},
175};
176MODULE_DEVICE_TABLE(of, kdwc3_of_match);
177
178static struct platform_driver kdwc3_driver = {
179 .probe = kdwc3_probe,
180 .remove = kdwc3_remove,
181 .driver = {
182 .name = "keystone-dwc3",
WingMan Kwok943befc2013-12-12 12:25:29 -0500183 .of_match_table = kdwc3_of_match,
184 },
185};
186
187module_platform_driver(kdwc3_driver);
188
189MODULE_ALIAS("platform:keystone-dwc3");
190MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
191MODULE_LICENSE("GPL v2");
192MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");