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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 static u64 kdwc3_dma_mask;
 43 
 44 struct dwc3_keystone {
 45         struct device                   *dev;
 46         struct clk                      *clk;
 47         void __iomem                    *usbss;
 48 };
 49 
 50 static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
 51 {
 52         return readl(base + offset);
 53 }
 54 
 55 static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
 56 {
 57         writel(value, base + offset);
 58 }
 59 
 60 static 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 
 69 static 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 
 78 static 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 
 90 static 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         if (!res) {
108                 dev_err(dev, "missing usbss resource\n");
109                 return -EINVAL;
110         }
111 
112         kdwc->usbss = devm_ioremap_resource(dev, res);
113         if (IS_ERR(kdwc->usbss))
114                 return PTR_ERR(kdwc->usbss);
115 
116         kdwc3_dma_mask = dma_get_mask(dev);
117         dev->dma_mask = &kdwc3_dma_mask;
118 
119         kdwc->clk = devm_clk_get(kdwc->dev, "usb");
120 
121         error = clk_prepare_enable(kdwc->clk);
122         if (error < 0) {
123                 dev_dbg(kdwc->dev, "unable to enable usb clock, err %d\n",
124                         error);
125                 return error;
126         }
127 
128         irq = platform_get_irq(pdev, 0);
129         if (irq < 0) {
130                 dev_err(&pdev->dev, "missing irq\n");
131                 goto err_irq;
132         }
133 
134         error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
135                         dev_name(dev), kdwc);
136         if (error) {
137                 dev_err(dev, "failed to request IRQ #%d --> %d\n",
138                                 irq, error);
139                 goto err_irq;
140         }
141 
142         kdwc3_enable_irqs(kdwc);
143 
144         error = of_platform_populate(node, NULL, NULL, dev);
145         if (error) {
146                 dev_err(&pdev->dev, "failed to create dwc3 core\n");
147                 goto err_core;
148         }
149 
150         return 0;
151 
152 err_core:
153         kdwc3_disable_irqs(kdwc);
154 err_irq:
155         clk_disable_unprepare(kdwc->clk);
156 
157         return error;
158 }
159 
160 static int kdwc3_remove_core(struct device *dev, void *c)
161 {
162         struct platform_device *pdev = to_platform_device(dev);
163 
164         platform_device_unregister(pdev);
165 
166         return 0;
167 }
168 
169 static int kdwc3_remove(struct platform_device *pdev)
170 {
171         struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
172 
173         kdwc3_disable_irqs(kdwc);
174         device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
175         clk_disable_unprepare(kdwc->clk);
176         platform_set_drvdata(pdev, NULL);
177 
178         return 0;
179 }
180 
181 static const struct of_device_id kdwc3_of_match[] = {
182         { .compatible = "ti,keystone-dwc3", },
183         {},
184 };
185 MODULE_DEVICE_TABLE(of, kdwc3_of_match);
186 
187 static struct platform_driver kdwc3_driver = {
188         .probe          = kdwc3_probe,
189         .remove         = kdwc3_remove,
190         .driver         = {
191                 .name   = "keystone-dwc3",
192                 .owner          = THIS_MODULE,
193                 .of_match_table = kdwc3_of_match,
194         },
195 };
196 
197 module_platform_driver(kdwc3_driver);
198 
199 MODULE_ALIAS("platform:keystone-dwc3");
200 MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
201 MODULE_LICENSE("GPL v2");
202 MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
203 

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