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