drivers/usb/musb/ux500.c

   1 /*
   2  * Copyright (C) 2010 ST-Ericsson AB
   3  * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
   4  *
   5  * Based on omap2430.c
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  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  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/clk.h>
  26 #include <linux/io.h>
  27 #include <linux/platform_device.h>
  28
  29 #include "musb_core.h"
  30
  31 struct ux500_glue {
  32         struct device           *dev;
  33         struct platform_device  *musb;
  34         struct clk              *clk;
  35 };
  36 #define glue_to_musb(g) platform_get_drvdata(g->musb)
  37
  38 static int ux500_musb_init(struct musb *musb)
  39 {
  40         musb->xceiv = otg_get_transceiver();
  41         if (!musb->xceiv) {
  42                 pr_err("HS USB OTG: no transceiver configured\n");
  43                 return -ENODEV;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static int ux500_musb_exit(struct musb *musb)
  50 {
  51         otg_put_transceiver(musb->xceiv);
  52
  53         return 0;
  54 }
  55
  56 static const struct musb_platform_ops ux500_ops = {
  57         .init           = ux500_musb_init,
  58         .exit           = ux500_musb_exit,
  59 };
  60
  61 static int __init ux500_probe(struct platform_device *pdev)
  62 {
  63         struct musb_hdrc_platform_data  *pdata = pdev->dev.platform_data;
  64         struct platform_device          *musb;
  65         struct ux500_glue               *glue;
  66         struct clk                      *clk;
  67
  68         int                             ret = -ENOMEM;
  69
  70         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
  71         if (!glue) {
  72                 dev_err(&pdev->dev, "failed to allocate glue context\n");
  73                 goto err0;
  74         }
  75
  76         musb = platform_device_alloc("musb-hdrc", -1);
  77         if (!musb) {
  78                 dev_err(&pdev->dev, "failed to allocate musb device\n");
  79                 goto err1;
  80         }
  81
  82         clk = clk_get(&pdev->dev, "usb");
  83         if (IS_ERR(clk)) {
  84                 dev_err(&pdev->dev, "failed to get clock\n");
  85                 ret = PTR_ERR(clk);
  86                 goto err2;
  87         }
  88
  89         ret = clk_enable(clk);
  90         if (ret) {
  91                 dev_err(&pdev->dev, "failed to enable clock\n");
  92                 goto err3;
  93         }
  94
  95         musb->dev.parent                = &pdev->dev;
  96         musb->dev.dma_mask              = pdev->dev.dma_mask;
  97         musb->dev.coherent_dma_mask     = pdev->dev.coherent_dma_mask;
  98
  99         glue->dev                       = &pdev->dev;
 100         glue->musb                      = musb;
 101         glue->clk                       = clk;
 102
 103         pdata->platform_ops             = &ux500_ops;
 104
 105         platform_set_drvdata(pdev, glue);
 106
 107         ret = platform_device_add_resources(musb, pdev->resource,
 108                         pdev->num_resources);
 109         if (ret) {
 110                 dev_err(&pdev->dev, "failed to add resources\n");
 111                 goto err4;
 112         }
 113
 114         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 115         if (ret) {
 116                 dev_err(&pdev->dev, "failed to add platform_data\n");
 117                 goto err4;
 118         }
 119
 120         ret = platform_device_add(musb);
 121         if (ret) {
 122                 dev_err(&pdev->dev, "failed to register musb device\n");
 123                 goto err4;
 124         }
 125
 126         return 0;
 127
 128 err4:
 129         clk_disable(clk);
 130
 131 err3:
 132         clk_put(clk);
 133
 134 err2:
 135         platform_device_put(musb);
 136
 137 err1:
 138         kfree(glue);
 139
 140 err0:
 141         return ret;
 142 }
 143
 144 static int __exit ux500_remove(struct platform_device *pdev)
 145 {
 146         struct ux500_glue       *glue = platform_get_drvdata(pdev);
 147
 148         platform_device_del(glue->musb);
 149         platform_device_put(glue->musb);
 150         clk_disable(glue->clk);
 151         clk_put(glue->clk);
 152         kfree(glue);
 153
 154         return 0;
 155 }
 156
 157 #ifdef CONFIG_PM
 158 static int ux500_suspend(struct device *dev)
 159 {
 160         struct ux500_glue       *glue = dev_get_drvdata(dev);
 161         struct musb             *musb = glue_to_musb(glue);
 162
 163         otg_set_suspend(musb->xceiv, 1);
 164         clk_disable(glue->clk);
 165
 166         return 0;
 167 }
 168
 169 static int ux500_resume(struct device *dev)
 170 {
 171         struct ux500_glue       *glue = dev_get_drvdata(dev);
 172         struct musb             *musb = glue_to_musb(glue);
 173         int                     ret;
 174
 175         ret = clk_enable(glue->clk);
 176         if (ret) {
 177                 dev_err(dev, "failed to enable clock\n");
 178                 return ret;
 179         }
 180
 181         otg_set_suspend(musb->xceiv, 0);
 182
 183         return 0;
 184 }
 185
 186 static const struct dev_pm_ops ux500_pm_ops = {
 187         .suspend        = ux500_suspend,
 188         .resume         = ux500_resume,
 189 };
 190
 191 #define DEV_PM_OPS      (&ux500_pm_ops)
 192 #else
 193 #define DEV_PM_OPS      NULL
 194 #endif
 195
 196 static struct platform_driver ux500_driver = {
 197         .remove         = __exit_p(ux500_remove),
 198         .driver         = {
 199                 .name   = "musb-ux500",
 200                 .pm     = DEV_PM_OPS,
 201         },
 202 };
 203
 204 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
 205 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
 206 MODULE_LICENSE("GPL v2");
 207
 208 static int __init ux500_init(void)
 209 {
 210         return platform_driver_probe(&ux500_driver, ux500_probe);
 211 }
 212 subsys_initcall(ux500_init);
 213
 214 static void __exit ux500_exit(void)
 215 {
 216         platform_driver_unregister(&ux500_driver);
 217 }
 218 module_exit(ux500_exit);