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/usb.h>
  41 #include <linux/usb/c67x00.h>
  42
  43 #include "c67x00.h"
  44 #include "c67x00-hcd.h"
  45
  46 static void c67x00_probe_sie(struct c67x00_sie *sie,
  47                              struct c67x00_device *dev, int sie_num)
  48 {
  49         spin_lock_init(&sie->lock);
  50         sie->dev = dev;
  51         sie->sie_num = sie_num;
  52         sie->mode = c67x00_sie_config(dev->pdata->sie_config, sie_num);
  53
  54         switch (sie->mode) {
  55         case C67X00_SIE_HOST:
  56                 c67x00_hcd_probe(sie);
  57                 break;
  58
  59         case C67X00_SIE_UNUSED:
  60                 dev_info(sie_dev(sie),
  61                          "Not using SIE %d as requested\n", sie->sie_num);
  62                 break;
  63
  64         default:
  65                 dev_err(sie_dev(sie),
  66                         "Unsupported configuration: 0x%x for SIE %d\n",
  67                         sie->mode, sie->sie_num);
  68                 break;
  69         }
  70 }
  71
  72 static void c67x00_remove_sie(struct c67x00_sie *sie)
  73 {
  74         switch (sie->mode) {
  75         case C67X00_SIE_HOST:
  76                 c67x00_hcd_remove(sie);
  77                 break;
  78
  79         default:
  80                 break;
  81         }
  82 }
  83
  84 static irqreturn_t c67x00_irq(int irq, void *__dev)
  85 {
  86         struct c67x00_device *c67x00 = __dev;
  87         struct c67x00_sie *sie;
  88         u16 msg, int_status;
  89         int i, count = 8;
  90
  91         int_status = c67x00_ll_hpi_status(c67x00);
  92         if (!int_status)
  93                 return IRQ_NONE;
  94
  95         while (int_status != 0 && (count-- >= 0)) {
  96                 c67x00_ll_irq(c67x00, int_status);
  97                 for (i = 0; i < C67X00_SIES; i++) {
  98                         sie = &c67x00->sie[i];
  99                         msg = 0;
 100                         if (int_status & SIEMSG_FLG(i))
 101                                 msg = c67x00_ll_fetch_siemsg(c67x00, i);
 102                         if (sie->irq)
 103                                 sie->irq(sie, int_status, msg);
 104                 }
 105                 int_status = c67x00_ll_hpi_status(c67x00);
 106         }
 107
 108         if (int_status)
 109                 dev_warn(&c67x00->pdev->dev, "Not all interrupts handled! "
 110                          "status = 0x%04x\n", int_status);
 111
 112         return IRQ_HANDLED;
 113 }
 114
 115 /* ------------------------------------------------------------------------- */
 116
 117 static int __devinit c67x00_drv_probe(struct platform_device *pdev)
 118 {
 119         struct c67x00_device *c67x00;
 120         struct c67x00_platform_data *pdata;
 121         struct resource *res, *res2;
 122         int ret, i;
 123
 124         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 125         if (!res)
 126                 return -ENODEV;
 127
 128         res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 129         if (!res2)
 130                 return -ENODEV;
 131
 132         pdata = pdev->dev.platform_data;
 133         if (!pdata)
 134                 return -ENODEV;
 135
 136         c67x00 = kzalloc(sizeof(*c67x00), GFP_KERNEL);
 137         if (!c67x00)
 138                 return -ENOMEM;
 139
 140         if (!request_mem_region(res->start, res->end - res->start + 1,
 141                                 pdev->name)) {
 142                 dev_err(&pdev->dev, "Memory region busy\n");
 143                 ret = -EBUSY;
 144                 goto request_mem_failed;
 145         }
 146         c67x00->hpi.base = ioremap(res->start, res->end - res->start + 1);
 147         if (!c67x00->hpi.base) {
 148                 dev_err(&pdev->dev, "Unable to map HPI registers\n");
 149                 ret = -EIO;
 150                 goto map_failed;
 151         }
 152
 153         spin_lock_init(&c67x00->hpi.lock);
 154         c67x00->hpi.regstep = pdata->hpi_regstep;
 155         c67x00->pdata = pdev->dev.platform_data;
 156         c67x00->pdev = pdev;
 157
 158         c67x00_ll_init(c67x00);
 159         c67x00_ll_hpi_reg_init(c67x00);
 160
 161         ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00);
 162         if (ret) {
 163                 dev_err(&pdev->dev, "Cannot claim IRQ\n");
 164                 goto request_irq_failed;
 165         }
 166
 167         ret = c67x00_ll_reset(c67x00);
 168         if (ret) {
 169                 dev_err(&pdev->dev, "Device reset failed\n");
 170                 goto reset_failed;
 171         }
 172
 173         for (i = 0; i < C67X00_SIES; i++)
 174                 c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
 175
 176         platform_set_drvdata(pdev, c67x00);
 177
 178         return 0;
 179
 180  reset_failed:
 181         free_irq(res2->start, c67x00);
 182  request_irq_failed:
 183         iounmap(c67x00->hpi.base);
 184  map_failed:
 185         release_mem_region(res->start, res->end - res->start + 1);
 186  request_mem_failed:
 187         kfree(c67x00);
 188
 189         return ret;
 190 }
 191
 192 static int __devexit c67x00_drv_remove(struct platform_device *pdev)
 193 {
 194         struct c67x00_device *c67x00 = platform_get_drvdata(pdev);
 195         struct resource *res;
 196         int i;
 197
 198         for (i = 0; i < C67X00_SIES; i++)
 199                 c67x00_remove_sie(&c67x00->sie[i]);
 200
 201         c67x00_ll_release(c67x00);
 202
 203         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 204         if (res)
 205                 free_irq(res->start, c67x00);
 206
 207         iounmap(c67x00->hpi.base);
 208
 209         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 210         if (res)
 211                 release_mem_region(res->start, res->end - res->start + 1);
 212
 213         kfree(c67x00);
 214
 215         return 0;
 216 }
 217
 218 static struct platform_driver c67x00_driver = {
 219         .probe  = c67x00_drv_probe,
 220         .remove = __devexit_p(c67x00_drv_remove),
 221         .driver = {
 222                 .owner = THIS_MODULE,
 223                 .name = "c67x00",
 224         },
 225 };
 226 MODULE_ALIAS("platform:c67x00");
 227
 228 static int __init c67x00_init(void)
 229 {
 230         return platform_driver_register(&c67x00_driver);
 231 }
 232
 233 static void __exit c67x00_exit(void)
 234 {
 235         platform_driver_unregister(&c67x00_driver);
 236 }
 237
 238 module_init(c67x00_init);
 239 module_exit(c67x00_exit);
 240
 241 MODULE_AUTHOR("Peter Korsgaard, Jan Veldeman, Grant Likely");
 242 MODULE_DESCRIPTION("Cypress C67X00 USB Controller Driver");
 243 MODULE_LICENSE("GPL");