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/err.h>
  27 #include <linux/io.h>
  28 #include <linux/platform_device.h>
  29
  30 #include "musb_core.h"
  31
  32 struct ux500_glue {
  33         struct device           *dev;
  34         struct platform_device  *musb;
  35         struct clk              *clk;
  36 };
  37 #define glue_to_musb(g) platform_get_drvdata(g->musb)
  38
  39 static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
  40 {
  41         unsigned long   flags;
  42         irqreturn_t     retval = IRQ_NONE;
  43         struct musb     *musb = __hci;
  44
  45         spin_lock_irqsave(&musb->lock, flags);
  46
  47         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
  48         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
  49         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
  50
  51         if (musb->int_usb || musb->int_tx || musb->int_rx)
  52                 retval = musb_interrupt(musb);
  53
  54         spin_unlock_irqrestore(&musb->lock, flags);
  55
  56         return retval;
  57 }
  58
  59 static int ux500_musb_init(struct musb *musb)
  60 {
  61         musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
  62         if (IS_ERR_OR_NULL(musb->xceiv)) {
  63                 pr_err("HS USB OTG: no transceiver configured\n");
  64                 return -ENODEV;
  65         }
  66
  67         musb->isr = ux500_musb_interrupt;
  68
  69         return 0;
  70 }
  71
  72 static int ux500_musb_exit(struct musb *musb)
  73 {
  74         usb_put_phy(musb->xceiv);
  75
  76         return 0;
  77 }
  78
  79 static const struct musb_platform_ops ux500_ops = {
  80         .init           = ux500_musb_init,
  81         .exit           = ux500_musb_exit,
  82 };
  83
  84 static int ux500_probe(struct platform_device *pdev)
  85 {
  86         struct musb_hdrc_platform_data  *pdata = pdev->dev.platform_data;
  87         struct platform_device          *musb;
  88         struct ux500_glue               *glue;
  89         struct clk                      *clk;
  90         int                             ret = -ENOMEM;
  91
  92         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
  93         if (!glue) {
  94                 dev_err(&pdev->dev, "failed to allocate glue context\n");
  95                 goto err0;
  96         }
  97
  98         musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
  99         if (!musb) {
 100                 dev_err(&pdev->dev, "failed to allocate musb device\n");
 101                 goto err1;
 102         }
 103
 104         clk = clk_get(&pdev->dev, "usb");
 105         if (IS_ERR(clk)) {
 106                 dev_err(&pdev->dev, "failed to get clock\n");
 107                 ret = PTR_ERR(clk);
 108                 goto err3;
 109         }
 110
 111         ret = clk_enable(clk);
 112         if (ret) {
 113                 dev_err(&pdev->dev, "failed to enable clock\n");
 114                 goto err4;
 115         }
 116
 117         musb->dev.parent                = &pdev->dev;
 118         musb->dev.dma_mask              = pdev->dev.dma_mask;
 119         musb->dev.coherent_dma_mask     = pdev->dev.coherent_dma_mask;
 120
 121         glue->dev                       = &pdev->dev;
 122         glue->musb                      = musb;
 123         glue->clk                       = clk;
 124
 125         pdata->platform_ops             = &ux500_ops;
 126
 127         platform_set_drvdata(pdev, glue);
 128
 129         ret = platform_device_add_resources(musb, pdev->resource,
 130                         pdev->num_resources);
 131         if (ret) {
 132                 dev_err(&pdev->dev, "failed to add resources\n");
 133                 goto err5;
 134         }
 135
 136         ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
 137         if (ret) {
 138                 dev_err(&pdev->dev, "failed to add platform_data\n");
 139                 goto err5;
 140         }
 141
 142         ret = platform_device_add(musb);
 143         if (ret) {
 144                 dev_err(&pdev->dev, "failed to register musb device\n");
 145                 goto err5;
 146         }
 147
 148         return 0;
 149
 150 err5:
 151         clk_disable(clk);
 152
 153 err4:
 154         clk_put(clk);
 155
 156 err3:
 157         platform_device_put(musb);
 158
 159 err1:
 160         kfree(glue);
 161
 162 err0:
 163         return ret;
 164 }
 165
 166 static int __devexit ux500_remove(struct platform_device *pdev)
 167 {
 168         struct ux500_glue       *glue = platform_get_drvdata(pdev);
 169
 170         platform_device_unregister(glue->musb);
 171         clk_disable(glue->clk);
 172         clk_put(glue->clk);
 173         kfree(glue);
 174
 175         return 0;
 176 }
 177
 178 #ifdef CONFIG_PM
 179 static int ux500_suspend(struct device *dev)
 180 {
 181         struct ux500_glue       *glue = dev_get_drvdata(dev);
 182         struct musb             *musb = glue_to_musb(glue);
 183
 184         usb_phy_set_suspend(musb->xceiv, 1);
 185         clk_disable(glue->clk);
 186
 187         return 0;
 188 }
 189
 190 static int ux500_resume(struct device *dev)
 191 {
 192         struct ux500_glue       *glue = dev_get_drvdata(dev);
 193         struct musb             *musb = glue_to_musb(glue);
 194         int                     ret;
 195
 196         ret = clk_enable(glue->clk);
 197         if (ret) {
 198                 dev_err(dev, "failed to enable clock\n");
 199                 return ret;
 200         }
 201
 202         usb_phy_set_suspend(musb->xceiv, 0);
 203
 204         return 0;
 205 }
 206
 207 static const struct dev_pm_ops ux500_pm_ops = {
 208         .suspend        = ux500_suspend,
 209         .resume         = ux500_resume,
 210 };
 211
 212 #define DEV_PM_OPS      (&ux500_pm_ops)
 213 #else
 214 #define DEV_PM_OPS      NULL
 215 #endif
 216
 217 static struct platform_driver ux500_driver = {
 218         .probe          = ux500_probe,
 219         .remove         = ux500_remove,
 220         .driver         = {
 221                 .name   = "musb-ux500",
 222                 .pm     = DEV_PM_OPS,
 223         },
 224 };
 225
 226 MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
 227 MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
 228 MODULE_LICENSE("GPL v2");
 229 module_platform_driver(ux500_driver);