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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         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_dbg(kdwc->dev, "unable to enable usb clock, err %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 
148 err_core:
149         kdwc3_disable_irqs(kdwc);
150 err_irq:
151         clk_disable_unprepare(kdwc->clk);
152 
153         return error;
154 }
155 
156 static 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 
165 static 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 
177 static const struct of_device_id kdwc3_of_match[] = {
178         { .compatible = "ti,keystone-dwc3", },
179         {},
180 };
181 MODULE_DEVICE_TABLE(of, kdwc3_of_match);
182 
183 static 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 
192 module_platform_driver(kdwc3_driver);
193 
194 MODULE_ALIAS("platform:keystone-dwc3");
195 MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
196 MODULE_LICENSE("GPL v2");
197 MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
198 

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