drivers/usb/c67x00/c67x00-drv.c

   1 /*
   2  * c67x00-drv.c: Cypress C67X00 USB Common infrastructure
   3  *
   4  * Copyright (C) 2006-2008 Barco N.V.
   5  *    Derived from the Cypress cy7c67200/300 ezusb linux driver and
   6  *    based on multiple host controller drivers inside the linux kernel.
   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 as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  21  * MA  02110-1301  USA.
  22  */
  23
  24 /*
  25  * This file implements the common infrastructure for using the c67x00.
  26  * It is both the link between the platform configuration and subdrivers and
  27  * the link between the common hardware parts and the subdrivers (e.g.
  28  * interrupt handling).
  29  *
  30  * The c67x00 has 2 SIE's (serial interface engine) wich can be configured
  31  * to be host, device or OTG (with some limitations, E.G. only SIE1 can be OTG).
  32  *
  33  * Depending on the platform configuration, the SIE's are created and
  34  * the corresponding subdriver is initialized (c67x00_probe_sie).
  35  */
  36
  37 #include <linux/device.h>
  38 #include <linux/io.h>
  39 #include <linux/list.h>
  40 #include <linux/slab.h>
  41 #include <linux/usb.h>
  42 #include <linux/usb/c67x00.h>
  43
  44 #include "c67x00.h"
  45 #include "c67x00-hcd.h"
  46
  47 static void c67x00_probe_sie(struct c67x00_sie *sie,
  48                              struct c67x00_device *dev, int sie_num)
  49 {
  50         spin_lock_init(&sie->lock);
  51         sie->dev = dev;
  52         sie->sie_num = sie_num;
  53         sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
  54
  55         switch (sie->mode) {
  56         case C67X00_SIE_HOST:
  57                 c67x00_hcd_probe(sie);
  58                 break;
  59
  60         case C67X00_SIE_UNUSED:
  61                 dev_info(sie_dev(sie),
  62                          "Not using SIE %d as requested\n", sie->sie_num);
  63                 break;
  64
  65         default:
  66                 dev_err(sie_dev(sie),
  67                         "Unsupported configuration: 0x%x for SIE %d\n",
  68                         sie->mode, sie->sie_num);
  69                 break;
  70         }
  71 }
  72
  73 static void c67x00_remove_sie(struct c67x00_sie *sie)
  74 {
  75         switch (sie->mode) {
  76         case C67X00_SIE_HOST:
  77                 c67x00_hcd_remove(sie);
  78                 break;
  79
  80         default:
  81                 break;
  82         }
  83 }
  84
  85 static irqreturn_t c67x00_irq(int irq, void *__dev)
  86 {
  87         struct c67x00_device *c67x00 = __dev;
  88         struct c67x00_sie *sie;
  89         u16 msg, int_status;
  90         int i, count = 8;
  91
  92         int_status = c67x00_ll_hpi_status(c67x00);
  93         if (!int_status)
  94                 return IRQ_NONE;
  95
  96         while (int_status != 0 && (count-- >= 0)) {
  97                 c67x00_ll_irq(c67x00, int_status);
  98                 for (i = 0; i < C67X00_SIES; i++) {
  99                         sie = &c67x00->sie[i];
 100                         msg = 0;
 101                         if (int_status & SIEMSG_FLG(i))
 102                                 msg = c67x00_ll_fetch_siemsg(c67x00, i);
 103                         if (sie->irq)
 104                                 sie->irq(sie, int_status, msg);
 105                 }
 106                 int_status = c67x00_ll_hpi_status(c67x00);
 107         }
 108
 109         if (int_status)
 110                 dev_warn(&c67x00->pdev->dev, "Not all interrupts handled! "
 111                          "status = 0x%04x\n", int_status);
 112
 113         return IRQ_HANDLED;
 114 }
 115
 116 /* ------------------------------------------------------------------------- */
 117
 118 static int __devinit c67x00_drv_probe(struct platform_device *pdev)
 119 {
 120         struct c67x00_device *c67x00;
 121         struct c67x00_platform_data *pdata;
 122         struct resource *res, *res2;
 123         int ret, i;
 124
 125         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 126         if (!res)
 127                 return -ENODEV;
 128
 129         res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 130         if (!res2)
 131                 return -ENODEV;
 132
 133         pdata = pdev->dev.platform_data;
 134         if (!pdata)
 135                 return -ENODEV;
 136
 137         c67x00 = kzalloc(sizeof(*c67x00), GFP_KERNEL);
 138         if (!c67x00)
 139                 return -ENOMEM;
 140
 141         if (!request_mem_region(res->start, resource_size(res),
 142                                 pdev->name)) {
 143                 dev_err(&pdev->dev, "Memory region busy\n");
 144                 ret = -EBUSY;
 145                 goto request_mem_failed;
 146         }
 147         c67x00->hpi.base = ioremap(res->start, resource_size(res));
 148         if (!c67x00->hpi.base) {
 149                 dev_err(&pdev->dev, "Unable to map HPI registers\n");
 150                 ret = -EIO;
 151                 goto map_failed;
 152         }
 153
 154         spin_lock_init(&c67x00->hpi.lock);
 155         c67x00->hpi.regstep = pdata->hpi_regstep;
 156         c67x00->pdata = pdev->dev.platform_data;
 157         c67x00->pdev = pdev;
 158
 159         c67x00_ll_init(c67x00);
 160         c67x00_ll_hpi_reg_init(c67x00);
 161
 162         ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00);
 163         if (ret) {
 164                 dev_err(&pdev->dev, "Cannot claim IRQ\n");
 165                 goto request_irq_failed;
 166         }
 167
 168         ret = c67x00_ll_reset(c67x00);
 169         if (ret) {
 170                 dev_err(&pdev->dev, "Device reset failed\n");
 171                 goto reset_failed;
 172         }
 173
 174         for (i = 0; i < C67X00_SIES; i++)
 175                 c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
 176
 177         platform_set_drvdata(pdev, c67x00);
 178
 179         return 0;
 180
 181  reset_failed:
 182         free_irq(res2->start, c67x00);
 183  request_irq_failed:
 184         iounmap(c67x00->hpi.base);
 185  map_failed:
 186         release_mem_region(res->start, resource_size(res));
 187  request_mem_failed:
 188         kfree(c67x00);
 189
 190         return ret;
 191 }
 192
 193 static int __devexit c67x00_drv_remove(struct platform_device *pdev)
 194 {
 195         struct c67x00_device *c67x00 = platform_get_drvdata(pdev);
 196         struct resource *res;
 197         int i;
 198
 199         for (i = 0; i < C67X00_SIES; i++)
 200                 c67x00_remove_sie(&c67x00->sie[i]);
 201
 202         c67x00_ll_release(c67x00);
 203
 204         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 205         if (res)
 206                 free_irq(res->start, c67x00);
 207
 208         iounmap(c67x00->hpi.base);
 209
 210         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 211         if (res)
 212                 release_mem_region(res->start, resource_size(res));
 213
 214         kfree(c67x00);
 215
 216         return 0;
 217 }
 218
 219 static struct platform_driver c67x00_driver = {
 220         .probe  = c67x00_drv_probe,
 221         .remove = __devexit_p(c67x00_drv_remove),
 222         .driver = {
 223                 .owner = THIS_MODULE,
 224                 .name = "c67x00",
 225         },
 226 };
 227 MODULE_ALIAS("platform:c67x00");
 228
 229 static int __init c67x00_init(void)
 230 {
 231         return platform_driver_register(&c67x00_driver);
 232 }
 233
 234 static void __exit c67x00_exit(void)
 235 {
 236         platform_driver_unregister(&c67x00_driver);
 237 }
 238
 239 module_init(c67x00_init);
 240 module_exit(c67x00_exit);
 241
 242 MODULE_AUTHOR("Peter Korsgaard, Jan Veldeman, Grant Likely");
 243 MODULE_DESCRIPTION("Cypress C67X00 USB Controller Driver");
 244 MODULE_LICENSE("GPL");