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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
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
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
42static u64 kdwc3_dma_mask;
43
44struct dwc3_keystone {
45 struct device *dev;
46 struct clk *clk;
47 void __iomem *usbss;
48};
49
50static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
51{
52 return readl(base + offset);
53}
54
55static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
56{
57 writel(value, base + offset);
58}
59
60static void kdwc3_enable_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 void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
70{
71 u32 val;
72
73 val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
74 val &= ~USBSS_IRQ_COREIRQ_EN;
75 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
76}
77
78static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
79{
80 struct dwc3_keystone *kdwc = _kdwc;
81
82 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
83 kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
84 kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
85 kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
86
87 return IRQ_HANDLED;
88}
89
90static int kdwc3_probe(struct platform_device *pdev)
91{
92 struct device *dev = &pdev->dev;
93 struct device_node *node = pdev->dev.of_node;
94 struct dwc3_keystone *kdwc;
95 struct resource *res;
96 int error, irq;
97
98 kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
99 if (!kdwc)
100 return -ENOMEM;
101
102 platform_set_drvdata(pdev, kdwc);
103
104 kdwc->dev = dev;
105
106 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107 kdwc->usbss = devm_ioremap_resource(dev, res);
108 if (IS_ERR(kdwc->usbss))
109 return PTR_ERR(kdwc->usbss);
110
111 kdwc3_dma_mask = dma_get_mask(dev);
112 dev->dma_mask = &kdwc3_dma_mask;
113
114 kdwc->clk = devm_clk_get(kdwc->dev, "usb");
115
116 error = clk_prepare_enable(kdwc->clk);
117 if (error < 0) {
118 dev_err(kdwc->dev, "unable to enable usb clock, error %d\n",
119 error);
120 return error;
121 }
122
123 irq = platform_get_irq(pdev, 0);
124 if (irq < 0) {
125 dev_err(&pdev->dev, "missing irq\n");
126 error = irq;
127 goto err_irq;
128 }
129
130 error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
131 dev_name(dev), kdwc);
132 if (error) {
133 dev_err(dev, "failed to request IRQ #%d --> %d\n",
134 irq, error);
135 goto err_irq;
136 }
137
138 kdwc3_enable_irqs(kdwc);
139
140 error = of_platform_populate(node, NULL, NULL, dev);
141 if (error) {
142 dev_err(&pdev->dev, "failed to create dwc3 core\n");
143 goto err_core;
144 }
145
146 return 0;
147
148err_core:
149 kdwc3_disable_irqs(kdwc);
150err_irq:
151 clk_disable_unprepare(kdwc->clk);
152
153 return error;
154}
155
156static int kdwc3_remove_core(struct device *dev, void *c)
157{
158 struct platform_device *pdev = to_platform_device(dev);
159
160 platform_device_unregister(pdev);
161
162 return 0;
163}
164
165static int kdwc3_remove(struct platform_device *pdev)
166{
167 struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
168
169 kdwc3_disable_irqs(kdwc);
170 device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
171 clk_disable_unprepare(kdwc->clk);
172 platform_set_drvdata(pdev, NULL);
173
174 return 0;
175}
176
177static const struct of_device_id kdwc3_of_match[] = {
178 { .compatible = "ti,keystone-dwc3", },
179 {},
180};
181MODULE_DEVICE_TABLE(of, kdwc3_of_match);
182
183static struct platform_driver kdwc3_driver = {
184 .probe = kdwc3_probe,
185 .remove = kdwc3_remove,
186 .driver = {
187 .name = "keystone-dwc3",
188 .of_match_table = kdwc3_of_match,
189 },
190};
191
192module_platform_driver(kdwc3_driver);
193
194MODULE_ALIAS("platform:keystone-dwc3");
195MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
196MODULE_LICENSE("GPL v2");
197MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
198
