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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/pm_runtime.h>
18
19
20#define USBSS_REVISION 0x0000
21#define USBSS_SYSCONFIG 0x0010
22#define USBSS_IRQ_EOI 0x0018
23#define USBSS_IRQSTATUS_RAW_0 0x0020
24#define USBSS_IRQSTATUS_0 0x0024
25#define USBSS_IRQENABLE_SET_0 0x0028
26#define USBSS_IRQENABLE_CLR_0 0x002c
27
28
29#define USBSS_IRQ_EOI_LINE(n) BIT(n)
30#define USBSS_IRQ_EVENT_ST BIT(0)
31#define USBSS_IRQ_COREIRQ_EN BIT(0)
32#define USBSS_IRQ_COREIRQ_CLR BIT(0)
33
34struct dwc3_keystone {
35 struct device *dev;
36 void __iomem *usbss;
37};
38
39static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
40{
41 return readl(base + offset);
42}
43
44static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
45{
46 writel(value, base + offset);
47}
48
49static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
50{
51 u32 val;
52
53 val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
54 val |= USBSS_IRQ_COREIRQ_EN;
55 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
56}
57
58static void kdwc3_disable_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 irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
68{
69 struct dwc3_keystone *kdwc = _kdwc;
70
71 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
72 kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
73 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
74 kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
75
76 return IRQ_HANDLED;
77}
78
79static int kdwc3_probe(struct platform_device *pdev)
80{
81 struct device *dev = &pdev->dev;
82 struct device_node *node = pdev->dev.of_node;
83 struct dwc3_keystone *kdwc;
84 struct resource *res;
85 int error, irq;
86
87 kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
88 if (!kdwc)
89 return -ENOMEM;
90
91 platform_set_drvdata(pdev, kdwc);
92
93 kdwc->dev = dev;
94
95 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
96 kdwc->usbss = devm_ioremap_resource(dev, res);
97 if (IS_ERR(kdwc->usbss))
98 return PTR_ERR(kdwc->usbss);
99
100 pm_runtime_enable(kdwc->dev);
101
102 error = pm_runtime_get_sync(kdwc->dev);
103 if (error < 0) {
104 dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
105 error);
106 goto err_irq;
107 }
108
109
110 if (of_device_is_compatible(node, "ti,am654-dwc3"))
111 goto skip_irq;
112
113 irq = platform_get_irq(pdev, 0);
114 if (irq < 0) {
115 dev_err(&pdev->dev, "missing irq\n");
116 error = irq;
117 goto err_irq;
118 }
119
120 error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
121 dev_name(dev), kdwc);
122 if (error) {
123 dev_err(dev, "failed to request IRQ #%d --> %d\n",
124 irq, error);
125 goto err_irq;
126 }
127
128 kdwc3_enable_irqs(kdwc);
129
130skip_irq:
131 error = of_platform_populate(node, NULL, NULL, dev);
132 if (error) {
133 dev_err(&pdev->dev, "failed to create dwc3 core\n");
134 goto err_core;
135 }
136
137 return 0;
138
139err_core:
140 kdwc3_disable_irqs(kdwc);
141err_irq:
142 pm_runtime_put_sync(kdwc->dev);
143 pm_runtime_disable(kdwc->dev);
144
145 return error;
146}
147
148static int kdwc3_remove_core(struct device *dev, void *c)
149{
150 struct platform_device *pdev = to_platform_device(dev);
151
152 platform_device_unregister(pdev);
153
154 return 0;
155}
156
157static int kdwc3_remove(struct platform_device *pdev)
158{
159 struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
160 struct device_node *node = pdev->dev.of_node;
161
162 if (!of_device_is_compatible(node, "ti,am654-dwc3"))
163 kdwc3_disable_irqs(kdwc);
164
165 device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
166 pm_runtime_put_sync(kdwc->dev);
167 pm_runtime_disable(kdwc->dev);
168
169 platform_set_drvdata(pdev, NULL);
170
171 return 0;
172}
173
174static const struct of_device_id kdwc3_of_match[] = {
175 { .compatible = "ti,keystone-dwc3", },
176 { .compatible = "ti,am654-dwc3" },
177 {},
178};
179MODULE_DEVICE_TABLE(of, kdwc3_of_match);
180
181static struct platform_driver kdwc3_driver = {
182 .probe = kdwc3_probe,
183 .remove = kdwc3_remove,
184 .driver = {
185 .name = "keystone-dwc3",
186 .of_match_table = kdwc3_of_match,
187 },
188};
189
190module_platform_driver(kdwc3_driver);
191
192MODULE_ALIAS("platform:keystone-dwc3");
193MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
194MODULE_LICENSE("GPL v2");
195MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
196
