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1/**
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
42struct 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);
105 kdwc->usbss = devm_ioremap_resource(dev, res);
106 if (IS_ERR(kdwc->usbss))
107 return PTR_ERR(kdwc->usbss);
108
109 kdwc->clk = devm_clk_get(kdwc->dev, "usb");
110
111 error = clk_prepare_enable(kdwc->clk);
112 if (error < 0) {
113 dev_err(kdwc->dev, "unable to enable usb clock, error %d\n",
114 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");
121 error = irq;
122 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",
183 .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");
1// SPDX-License-Identifier: GPL-2.0
2/**
3 * dwc3-keystone.c - Keystone Specific Glue layer
4 *
5 * Copyright (C) 2010-2013 Texas Instruments Incorporated - https://www.ti.com
6 *
7 * Author: WingMan Kwok <w-kwok2@ti.com>
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/interrupt.h>
13#include <linux/platform_device.h>
14#include <linux/dma-mapping.h>
15#include <linux/io.h>
16#include <linux/of_platform.h>
17#include <linux/phy/phy.h>
18#include <linux/pm_runtime.h>
19
20/* USBSS register offsets */
21#define USBSS_REVISION 0x0000
22#define USBSS_SYSCONFIG 0x0010
23#define USBSS_IRQ_EOI 0x0018
24#define USBSS_IRQSTATUS_RAW_0 0x0020
25#define USBSS_IRQSTATUS_0 0x0024
26#define USBSS_IRQENABLE_SET_0 0x0028
27#define USBSS_IRQENABLE_CLR_0 0x002c
28
29/* IRQ register bits */
30#define USBSS_IRQ_EOI_LINE(n) BIT(n)
31#define USBSS_IRQ_EVENT_ST BIT(0)
32#define USBSS_IRQ_COREIRQ_EN BIT(0)
33#define USBSS_IRQ_COREIRQ_CLR BIT(0)
34
35struct dwc3_keystone {
36 struct device *dev;
37 void __iomem *usbss;
38 struct phy *usb3_phy;
39};
40
41static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
42{
43 return readl(base + offset);
44}
45
46static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
47{
48 writel(value, base + offset);
49}
50
51static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
52{
53 u32 val;
54
55 val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
56 val |= USBSS_IRQ_COREIRQ_EN;
57 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
58}
59
60static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
61{
62 u32 val;
63
64 val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
65 val &= ~USBSS_IRQ_COREIRQ_EN;
66 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
67}
68
69static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
70{
71 struct dwc3_keystone *kdwc = _kdwc;
72
73 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
74 kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
75 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
76 kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
77
78 return IRQ_HANDLED;
79}
80
81static int kdwc3_probe(struct platform_device *pdev)
82{
83 struct device *dev = &pdev->dev;
84 struct device_node *node = pdev->dev.of_node;
85 struct dwc3_keystone *kdwc;
86 int error, irq;
87
88 kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
89 if (!kdwc)
90 return -ENOMEM;
91
92 platform_set_drvdata(pdev, kdwc);
93
94 kdwc->dev = dev;
95
96 kdwc->usbss = devm_platform_ioremap_resource(pdev, 0);
97 if (IS_ERR(kdwc->usbss))
98 return PTR_ERR(kdwc->usbss);
99
100 /* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
101 kdwc->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
102 if (IS_ERR(kdwc->usb3_phy)) {
103 error = PTR_ERR(kdwc->usb3_phy);
104 if (error != -EPROBE_DEFER)
105 dev_err(dev, "couldn't get usb3 phy: %d\n", error);
106
107 return error;
108 }
109
110 phy_pm_runtime_get_sync(kdwc->usb3_phy);
111
112 error = phy_reset(kdwc->usb3_phy);
113 if (error < 0) {
114 dev_err(dev, "usb3 phy reset failed: %d\n", error);
115 return error;
116 }
117
118 error = phy_init(kdwc->usb3_phy);
119 if (error < 0) {
120 dev_err(dev, "usb3 phy init failed: %d\n", error);
121 return error;
122 }
123
124 error = phy_power_on(kdwc->usb3_phy);
125 if (error < 0) {
126 dev_err(dev, "usb3 phy power on failed: %d\n", error);
127 phy_exit(kdwc->usb3_phy);
128 return error;
129 }
130
131 pm_runtime_enable(kdwc->dev);
132 error = pm_runtime_get_sync(kdwc->dev);
133 if (error < 0) {
134 dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
135 error);
136 goto err_irq;
137 }
138
139 /* IRQ processing not required currently for AM65 */
140 if (of_device_is_compatible(node, "ti,am654-dwc3"))
141 goto skip_irq;
142
143 irq = platform_get_irq(pdev, 0);
144 if (irq < 0) {
145 error = irq;
146 goto err_irq;
147 }
148
149 error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
150 dev_name(dev), kdwc);
151 if (error) {
152 dev_err(dev, "failed to request IRQ #%d --> %d\n",
153 irq, error);
154 goto err_irq;
155 }
156
157 kdwc3_enable_irqs(kdwc);
158
159skip_irq:
160 error = of_platform_populate(node, NULL, NULL, dev);
161 if (error) {
162 dev_err(&pdev->dev, "failed to create dwc3 core\n");
163 goto err_core;
164 }
165
166 return 0;
167
168err_core:
169 kdwc3_disable_irqs(kdwc);
170err_irq:
171 pm_runtime_put_sync(kdwc->dev);
172 pm_runtime_disable(kdwc->dev);
173 phy_power_off(kdwc->usb3_phy);
174 phy_exit(kdwc->usb3_phy);
175 phy_pm_runtime_put_sync(kdwc->usb3_phy);
176
177 return error;
178}
179
180static int kdwc3_remove_core(struct device *dev, void *c)
181{
182 struct platform_device *pdev = to_platform_device(dev);
183
184 platform_device_unregister(pdev);
185
186 return 0;
187}
188
189static int kdwc3_remove(struct platform_device *pdev)
190{
191 struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
192 struct device_node *node = pdev->dev.of_node;
193
194 if (!of_device_is_compatible(node, "ti,am654-dwc3"))
195 kdwc3_disable_irqs(kdwc);
196
197 device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
198 pm_runtime_put_sync(kdwc->dev);
199 pm_runtime_disable(kdwc->dev);
200
201 phy_power_off(kdwc->usb3_phy);
202 phy_exit(kdwc->usb3_phy);
203 phy_pm_runtime_put_sync(kdwc->usb3_phy);
204
205 platform_set_drvdata(pdev, NULL);
206
207 return 0;
208}
209
210static const struct of_device_id kdwc3_of_match[] = {
211 { .compatible = "ti,keystone-dwc3", },
212 { .compatible = "ti,am654-dwc3" },
213 {},
214};
215MODULE_DEVICE_TABLE(of, kdwc3_of_match);
216
217static struct platform_driver kdwc3_driver = {
218 .probe = kdwc3_probe,
219 .remove = kdwc3_remove,
220 .driver = {
221 .name = "keystone-dwc3",
222 .of_match_table = kdwc3_of_match,
223 },
224};
225
226module_platform_driver(kdwc3_driver);
227
228MODULE_ALIAS("platform:keystone-dwc3");
229MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
230MODULE_LICENSE("GPL v2");
231MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");