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Linux/drivers/usb/dwc3/dwc3-keystone.c

  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 
 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);
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 
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",
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");
193 

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