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
  97         glue->dev                       = &pdev->dev;
  98         glue->musb                      = musb;
  99         glue->clk                       = clk;
 100
 101         pdata->platform_ops             = &ux500_ops;
 102
 103         platform_set_drvdata(pdev, glue);
 104
 105         ret = platform_device_add_resources(musb, pdev->resource,
 106                         pdev->num_resources);
 107         if (ret) {
 108                 dev_err(&pdev->dev, "failed to add resources\n");
 109                 goto err4;
 110         }
 111
 112         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 113         if (ret) {
 114                 dev_err(&pdev->dev, "failed to add platform_data\n");
 115                 goto err4;
 116         }
 117
 118         ret = platform_device_add(musb);
 119         if (ret) {
 120                 dev_err(&pdev->dev, "failed to register musb device\n");
 121                 goto err4;
 122         }
 123
 124         return 0;
 125
 126 err4:
 127         clk_disable(clk);
 128
 129 err3:
 130         clk_put(clk);
 131
 132 err2:
 133         platform_device_put(musb);
 134
 135 err1:
 136         kfree(glue);
 137
 138 err0:
 139         return ret;
 140 }
 141
 142 static int __exit ux500_remove(struct platform_device *pdev)
 143 {
 144         struct ux500_glue       *glue = platform_get_drvdata(pdev);
 145
 146         platform_device_del(glue->musb);
 147         platform_device_put(glue->musb);
 148         clk_disable(glue->clk);
 149         clk_put(glue->clk);
 150         kfree(glue);
 151
 152         return 0;
 153 }
 154
 155 #ifdef CONFIG_PM
 156 static int ux500_suspend(struct device *dev)
 157 {
 158         struct ux500_glue       *glue = dev_get_drvdata(dev);
 159         struct musb             *musb = glue_to_musb(glue);
 160
 161         otg_set_suspend(musb->xceiv, 1);
 162         clk_disable(glue->clk);
 163
 164         return 0;
 165 }
 166
 167 static int ux500_resume(struct device *dev)
 168 {
 169         struct ux500_glue       *glue = dev_get_drvdata(dev);
 170         struct musb             *musb = glue_to_musb(glue);
 171         int                     ret;
 172
 173         ret = clk_enable(glue->clk);
 174         if (ret) {
 175                 dev_err(dev, "failed to enable clock\n");
 176                 return ret;
 177         }
 178
 179         otg_set_suspend(musb->xceiv, 0);
 180
 181         return 0;
 182 }
 183
 184 static const struct dev_pm_ops ux500_pm_ops = {
 185         .suspend        = ux500_suspend,
 186         .resume         = ux500_resume,
 187 };
 188
 189 #define DEV_PM_OPS      (&ux500_pm_ops)
 190 #else
 191 #define DEV_PM_OPS      NULL
 192 #endif
 193
 194 static struct platform_driver ux500_driver = {
 195         .remove         = __exit_p(ux500_remove),
 196         .driver         = {
 197                 .name   = "musb-ux500",
 198                 .pm     = DEV_PM_OPS,
 199         },
 200 };
 201
 202 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
 203 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
 204 MODULE_LICENSE("GPL v2");
 205
 206 static int __init ux500_init(void)
 207 {
 208         return platform_driver_probe(&ux500_driver, ux500_probe);
 209 }
 210 subsys_initcall(ux500_init);
 211
 212 static void __exit ux500_exit(void)
 213 {
 214         platform_driver_unregister(&ux500_driver);
 215 }
 216 module_exit(ux500_exit);