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943befc3 WK |
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 | ||
943befc3 WK |
42 | struct dwc3_keystone { |
43 | struct device *dev; | |
44 | struct clk *clk; | |
45 | void __iomem *usbss; | |
46 | }; | |
47 | ||
48 | static inline u32 kdwc3_readl(void __iomem *base, u32 offset) | |
49 | { | |
50 | return readl(base + offset); | |
51 | } | |
52 | ||
53 | static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value) | |
54 | { | |
55 | writel(value, base + offset); | |
56 | } | |
57 | ||
58 | static 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 | ||
67 | static 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 | ||
76 | static 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 | ||
88 | static 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); | |
943befc3 WK |
105 | kdwc->usbss = devm_ioremap_resource(dev, res); |
106 | if (IS_ERR(kdwc->usbss)) | |
107 | return PTR_ERR(kdwc->usbss); | |
108 | ||
943befc3 WK |
109 | kdwc->clk = devm_clk_get(kdwc->dev, "usb"); |
110 | ||
111 | error = clk_prepare_enable(kdwc->clk); | |
112 | if (error < 0) { | |
9ff0fdca | 113 | dev_err(kdwc->dev, "unable to enable usb clock, error %d\n", |
943befc3 WK |
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"); | |
62c60697 | 121 | error = irq; |
943befc3 WK |
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 | ||
143 | err_core: | |
144 | kdwc3_disable_irqs(kdwc); | |
145 | err_irq: | |
146 | clk_disable_unprepare(kdwc->clk); | |
147 | ||
148 | return error; | |
149 | } | |
150 | ||
151 | static 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 | ||
160 | static 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 | ||
172 | static const struct of_device_id kdwc3_of_match[] = { | |
173 | { .compatible = "ti,keystone-dwc3", }, | |
174 | {}, | |
175 | }; | |
176 | MODULE_DEVICE_TABLE(of, kdwc3_of_match); | |
177 | ||
178 | static struct platform_driver kdwc3_driver = { | |
179 | .probe = kdwc3_probe, | |
180 | .remove = kdwc3_remove, | |
181 | .driver = { | |
182 | .name = "keystone-dwc3", | |
943befc3 WK |
183 | .of_match_table = kdwc3_of_match, |
184 | }, | |
185 | }; | |
186 | ||
187 | module_platform_driver(kdwc3_driver); | |
188 | ||
189 | MODULE_ALIAS("platform:keystone-dwc3"); | |
190 | MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>"); | |
191 | MODULE_LICENSE("GPL v2"); | |
192 | MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer"); |