drivers/pcmcia/bfin_cf_pcmcia.c

   1 /*
   2  * file: drivers/pcmcia/bfin_cf.c
   3  *
   4  * based on: drivers/pcmcia/omap_cf.c
   5  * omap_cf.c -- OMAP 16xx CompactFlash controller driver
   6  *
   7  * Copyright (c) 2005 David Brownell
   8  * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
   9  *
  10  * bugs:         enter bugs at http://blackfin.uclinux.org/
  11  *
  12  * this program is free software; you can redistribute it and/or modify
  13  * it under the terms of the gnu general public license as published by
  14  * the free software foundation; either version 2, or (at your option)
  15  * any later version.
  16  *
  17  * this program is distributed in the hope that it will be useful,
  18  * but without any warranty; without even the implied warranty of
  19  * merchantability or fitness for a particular purpose.  see the
  20  * gnu general public license for more details.
  21  *
  22  * you should have received a copy of the gnu general public license
  23  * along with this program; see the file copying.
  24  * if not, write to the free software foundation,
  25  * 59 temple place - suite 330, boston, ma 02111-1307, usa.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/sched.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/errno.h>
  33 #include <linux/init.h>
  34 #include <linux/delay.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/irq.h>
  37 #include <linux/io.h>
  38
  39 #include <pcmcia/ss.h>
  40 #include <pcmcia/cisreg.h>
  41 #include <asm/gpio.h>
  42
  43 #define SZ_1K   0x00000400
  44 #define SZ_8K   0x00002000
  45 #define SZ_2K   (2 * SZ_1K)
  46
  47 #define POLL_INTERVAL   (2 * HZ)
  48
  49 #define CF_ATASEL_ENA   0x20311802      /* Inverts RESET */
  50 #define CF_ATASEL_DIS   0x20311800
  51
  52 #define bfin_cf_present(pfx) (gpio_get_value(pfx))
  53
  54 /*--------------------------------------------------------------------------*/
  55
  56 static const char driver_name[] = "bfin_cf_pcmcia";
  57
  58 struct bfin_cf_socket {
  59         struct pcmcia_socket socket;
  60
  61         struct timer_list timer;
  62         unsigned present:1;
  63         unsigned active:1;
  64
  65         struct platform_device *pdev;
  66         unsigned long phys_cf_io;
  67         unsigned long phys_cf_attr;
  68         u_int irq;
  69         u_short cd_pfx;
  70 };
  71
  72 /*--------------------------------------------------------------------------*/
  73 static int bfin_cf_reset(void)
  74 {
  75         outw(0, CF_ATASEL_ENA);
  76         mdelay(200);
  77         outw(0, CF_ATASEL_DIS);
  78
  79         return 0;
  80 }
  81
  82 static int bfin_cf_ss_init(struct pcmcia_socket *s)
  83 {
  84         return 0;
  85 }
  86
  87 /* the timer is primarily to kick this socket's pccardd */
  88 static void bfin_cf_timer(unsigned long _cf)
  89 {
  90         struct bfin_cf_socket *cf = (void *)_cf;
  91         unsigned short present = bfin_cf_present(cf->cd_pfx);
  92
  93         if (present != cf->present) {
  94                 cf->present = present;
  95                 dev_dbg(&cf->pdev->dev, ": card %s\n",
  96                          present ? "present" : "gone");
  97                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  98         }
  99
 100         if (cf->active)
 101                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 102 }
 103
 104 static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 105 {
 106         struct bfin_cf_socket *cf;
 107
 108         if (!sp)
 109                 return -EINVAL;
 110
 111         cf = container_of(s, struct bfin_cf_socket, socket);
 112
 113         if (bfin_cf_present(cf->cd_pfx)) {
 114                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 115                 s->irq.AssignedIRQ = 0;
 116                 s->pci_irq = cf->irq;
 117
 118         } else
 119                 *sp = 0;
 120         return 0;
 121 }
 122
 123 static int
 124 bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 125 {
 126
 127         struct bfin_cf_socket *cf;
 128         cf = container_of(sock, struct bfin_cf_socket, socket);
 129
 130         switch (s->Vcc) {
 131         case 0:
 132         case 33:
 133                 break;
 134         case 50:
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         if (s->flags & SS_RESET) {
 141                 disable_irq(cf->irq);
 142                 bfin_cf_reset();
 143                 enable_irq(cf->irq);
 144         }
 145
 146         dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
 147                  s->Vcc, s->io_irq, s->flags, s->csc_mask);
 148
 149         return 0;
 150 }
 151
 152 static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
 153 {
 154         return bfin_cf_set_socket(s, &dead_socket);
 155 }
 156
 157 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
 158
 159 static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 160 {
 161         struct bfin_cf_socket *cf;
 162
 163         cf = container_of(s, struct bfin_cf_socket, socket);
 164         io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
 165         io->start = cf->phys_cf_io;
 166         io->stop = io->start + SZ_2K - 1;
 167         return 0;
 168 }
 169
 170 static int
 171 bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 172 {
 173         struct bfin_cf_socket *cf;
 174
 175         if (map->card_start)
 176                 return -EINVAL;
 177         cf = container_of(s, struct bfin_cf_socket, socket);
 178         map->static_start = cf->phys_cf_io;
 179         map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
 180         if (map->flags & MAP_ATTRIB)
 181                 map->static_start = cf->phys_cf_attr;
 182
 183         return 0;
 184 }
 185
 186 static struct pccard_operations bfin_cf_ops = {
 187         .init = bfin_cf_ss_init,
 188         .suspend = bfin_cf_ss_suspend,
 189         .get_status = bfin_cf_get_status,
 190         .set_socket = bfin_cf_set_socket,
 191         .set_io_map = bfin_cf_set_io_map,
 192         .set_mem_map = bfin_cf_set_mem_map,
 193 };
 194
 195 /*--------------------------------------------------------------------------*/
 196
 197 static int __devinit bfin_cf_probe(struct platform_device *pdev)
 198 {
 199         struct bfin_cf_socket *cf;
 200         struct resource *io_mem, *attr_mem;
 201         int irq;
 202         unsigned short cd_pfx;
 203         int status = 0;
 204
 205         dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");
 206
 207         irq = platform_get_irq(pdev, 0);
 208         if (!irq)
 209                 return -EINVAL;
 210
 211         cd_pfx = platform_get_irq(pdev, 1);     /*Card Detect GPIO PIN */
 212
 213         if (gpio_request(cd_pfx, "pcmcia: CD")) {
 214                 dev_err(&pdev->dev,
 215                        "Failed ro request Card Detect GPIO_%d\n",
 216                        cd_pfx);
 217                 return -EBUSY;
 218         }
 219         gpio_direction_input(cd_pfx);
 220
 221         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 222         if (!cf) {
 223                 gpio_free(cd_pfx);
 224                 return -ENOMEM;
 225         }
 226
 227         cf->cd_pfx = cd_pfx;
 228
 229         setup_timer(&cf->timer, bfin_cf_timer, (unsigned long)cf);
 230
 231         cf->pdev = pdev;
 232         platform_set_drvdata(pdev, cf);
 233
 234         cf->irq = irq;
 235         cf->socket.pci_irq = irq;
 236
 237         set_irq_type(irq, IRQF_TRIGGER_LOW);
 238
 239         io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 240         attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 241
 242         if (!io_mem || !attr_mem)
 243                 goto fail0;
 244
 245         cf->phys_cf_io = io_mem->start;
 246         cf->phys_cf_attr = attr_mem->start;
 247
 248         /* pcmcia layer only remaps "real" memory */
 249         cf->socket.io_offset = (unsigned long)
 250             ioremap(cf->phys_cf_io, SZ_2K);
 251
 252         if (!cf->socket.io_offset)
 253                 goto fail0;
 254
 255         dev_err(&pdev->dev, ": on irq %d\n", irq);
 256
 257         dev_dbg(&pdev->dev, ": %s\n",
 258                  bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");
 259
 260         cf->socket.owner = THIS_MODULE;
 261         cf->socket.dev.parent = &pdev->dev;
 262         cf->socket.ops = &bfin_cf_ops;
 263         cf->socket.resource_ops = &pccard_static_ops;
 264         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 265             | SS_CAP_MEM_ALIGN;
 266         cf->socket.map_size = SZ_2K;
 267
 268         status = pcmcia_register_socket(&cf->socket);
 269         if (status < 0)
 270                 goto fail2;
 271
 272         cf->active = 1;
 273         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 274         return 0;
 275
 276 fail2:
 277         iounmap((void __iomem *)cf->socket.io_offset);
 278         release_mem_region(cf->phys_cf_io, SZ_8K);
 279
 280 fail0:
 281         gpio_free(cf->cd_pfx);
 282         kfree(cf);
 283         platform_set_drvdata(pdev, NULL);
 284
 285         return status;
 286 }
 287
 288 static int __devexit bfin_cf_remove(struct platform_device *pdev)
 289 {
 290         struct bfin_cf_socket *cf = platform_get_drvdata(pdev);
 291
 292         gpio_free(cf->cd_pfx);
 293         cf->active = 0;
 294         pcmcia_unregister_socket(&cf->socket);
 295         del_timer_sync(&cf->timer);
 296         iounmap((void __iomem *)cf->socket.io_offset);
 297         release_mem_region(cf->phys_cf_io, SZ_8K);
 298         platform_set_drvdata(pdev, NULL);
 299         kfree(cf);
 300         return 0;
 301 }
 302
 303 static int bfin_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
 304 {
 305         return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
 306 }
 307
 308 static int bfin_cf_resume(struct platform_device *pdev)
 309 {
 310         return pcmcia_socket_dev_resume(&pdev->dev);
 311 }
 312
 313 static struct platform_driver bfin_cf_driver = {
 314         .driver = {
 315                    .name = (char *)driver_name,
 316                    .owner = THIS_MODULE,
 317                    },
 318         .probe = bfin_cf_probe,
 319         .remove = __devexit_p(bfin_cf_remove),
 320         .suspend = bfin_cf_suspend,
 321         .resume = bfin_cf_resume,
 322 };
 323
 324 static int __init bfin_cf_init(void)
 325 {
 326         return platform_driver_register(&bfin_cf_driver);
 327 }
 328
 329 static void __exit bfin_cf_exit(void)
 330 {
 331         platform_driver_unregister(&bfin_cf_driver);
 332 }
 333
 334 module_init(bfin_cf_init);
 335 module_exit(bfin_cf_exit);
 336
 337 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 338 MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
 339 MODULE_LICENSE("GPL");