drivers/pcmcia/electra_cf.c

   1 /*
   2  * Copyright (C) 2007 PA Semi, Inc
   3  *
   4  * Maintained by: Olof Johansson <olof@lixom.net>
   5  *
   6  * Based on drivers/pcmcia/omap_cf.c
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/sched.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/errno.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/mm.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/of_platform.h>
  34
  35 #include <pcmcia/ss.h>
  36
  37 static const char driver_name[] = "electra-cf";
  38
  39 struct electra_cf_socket {
  40         struct pcmcia_socket    socket;
  41
  42         struct timer_list       timer;
  43         unsigned                present:1;
  44         unsigned                active:1;
  45
  46         struct of_device        *ofdev;
  47         unsigned long           mem_phys;
  48         void __iomem *          mem_base;
  49         unsigned long           mem_size;
  50         void __iomem *          io_virt;
  51         unsigned int            io_base;
  52         unsigned int            io_size;
  53         u_int                   irq;
  54         struct resource         iomem;
  55         void __iomem *          gpio_base;
  56         int                     gpio_detect;
  57         int                     gpio_vsense;
  58         int                     gpio_3v;
  59         int                     gpio_5v;
  60 };
  61
  62 #define POLL_INTERVAL           (2 * HZ)
  63
  64
  65 static int electra_cf_present(struct electra_cf_socket *cf)
  66 {
  67         unsigned int gpio;
  68
  69         gpio = in_le32(cf->gpio_base+0x40);
  70         return !(gpio & (1 << cf->gpio_detect));
  71 }
  72
  73 static int electra_cf_ss_init(struct pcmcia_socket *s)
  74 {
  75         return 0;
  76 }
  77
  78 /* the timer is primarily to kick this socket's pccardd */
  79 static void electra_cf_timer(unsigned long _cf)
  80 {
  81         struct electra_cf_socket *cf = (void *) _cf;
  82         int present = electra_cf_present(cf);
  83
  84         if (present != cf->present) {
  85                 cf->present = present;
  86                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  87         }
  88
  89         if (cf->active)
  90                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  91 }
  92
  93 static irqreturn_t electra_cf_irq(int irq, void *_cf)
  94 {
  95         electra_cf_timer((unsigned long)_cf);
  96         return IRQ_HANDLED;
  97 }
  98
  99 static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 100 {
 101         struct electra_cf_socket *cf;
 102
 103         if (!sp)
 104                 return -EINVAL;
 105
 106         cf = container_of(s, struct electra_cf_socket, socket);
 107
 108         /* NOTE CF is always 3VCARD */
 109         if (electra_cf_present(cf)) {
 110                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 111
 112                 s->pci_irq = cf->irq;
 113         } else
 114                 *sp = 0;
 115         return 0;
 116 }
 117
 118 static int electra_cf_set_socket(struct pcmcia_socket *sock,
 119                                  struct socket_state_t *s)
 120 {
 121         unsigned int gpio;
 122         unsigned int vcc;
 123         struct electra_cf_socket *cf;
 124
 125         cf = container_of(sock, struct electra_cf_socket, socket);
 126
 127         /* "reset" means no power in our case */
 128         vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
 129
 130         switch (vcc) {
 131         case 0:
 132                 gpio = 0;
 133                 break;
 134         case 33:
 135                 gpio = (1 << cf->gpio_3v);
 136                 break;
 137         case 5:
 138                 gpio = (1 << cf->gpio_5v);
 139                 break;
 140         default:
 141                 return -EINVAL;
 142         }
 143
 144         gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
 145         gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
 146         out_le32(cf->gpio_base+0x90, gpio);
 147
 148         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 149                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 150
 151         return 0;
 152 }
 153
 154 static int electra_cf_set_io_map(struct pcmcia_socket *s,
 155                                  struct pccard_io_map *io)
 156 {
 157         return 0;
 158 }
 159
 160 static int electra_cf_set_mem_map(struct pcmcia_socket *s,
 161                                   struct pccard_mem_map *map)
 162 {
 163         struct electra_cf_socket *cf;
 164
 165         if (map->card_start)
 166                 return -EINVAL;
 167         cf = container_of(s, struct electra_cf_socket, socket);
 168         map->static_start = cf->mem_phys;
 169         map->flags &= MAP_ACTIVE|MAP_ATTRIB;
 170         if (!(map->flags & MAP_ATTRIB))
 171                 map->static_start += 0x800;
 172         return 0;
 173 }
 174
 175 static struct pccard_operations electra_cf_ops = {
 176         .init                   = electra_cf_ss_init,
 177         .get_status             = electra_cf_get_status,
 178         .set_socket             = electra_cf_set_socket,
 179         .set_io_map             = electra_cf_set_io_map,
 180         .set_mem_map            = electra_cf_set_mem_map,
 181 };
 182
 183 static int __devinit electra_cf_probe(struct of_device *ofdev,
 184                                       const struct of_device_id *match)
 185 {
 186         struct device *device = &ofdev->dev;
 187         struct device_node *np = ofdev->node;
 188         struct electra_cf_socket   *cf;
 189         struct resource mem, io;
 190         int status;
 191         const unsigned int *prop;
 192         int err;
 193         struct vm_struct *area;
 194
 195         err = of_address_to_resource(np, 0, &mem);
 196         if (err)
 197                 return -EINVAL;
 198
 199         err = of_address_to_resource(np, 1, &io);
 200         if (err)
 201                 return -EINVAL;
 202
 203         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 204         if (!cf)
 205                 return -ENOMEM;
 206
 207         setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
 208         cf->irq = NO_IRQ;
 209
 210         cf->ofdev = ofdev;
 211         cf->mem_phys = mem.start;
 212         cf->mem_size = PAGE_ALIGN(mem.end - mem.start);
 213         cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
 214         cf->io_size = PAGE_ALIGN(io.end - io.start);
 215
 216         area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
 217         if (area == NULL)
 218                 return -ENOMEM;
 219
 220         cf->io_virt = (void __iomem *)(area->addr);
 221
 222         cf->gpio_base = ioremap(0xfc103000, 0x1000);
 223         dev_set_drvdata(device, cf);
 224
 225         if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
 226             (__ioremap_at(io.start, cf->io_virt, cf->io_size,
 227                 _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
 228                 dev_err(device, "can't ioremap ranges\n");
 229                 status = -ENOMEM;
 230                 goto fail1;
 231         }
 232
 233
 234         cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
 235
 236         cf->iomem.start = (unsigned long)cf->mem_base;
 237         cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
 238         cf->iomem.flags = IORESOURCE_MEM;
 239
 240         cf->irq = irq_of_parse_and_map(np, 0);
 241
 242         status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
 243                              driver_name, cf);
 244         if (status < 0) {
 245                 dev_err(device, "request_irq failed\n");
 246                 goto fail1;
 247         }
 248
 249         cf->socket.pci_irq = cf->irq;
 250
 251         prop = of_get_property(np, "card-detect-gpio", NULL);
 252         if (!prop)
 253                 goto fail1;
 254         cf->gpio_detect = *prop;
 255
 256         prop = of_get_property(np, "card-vsense-gpio", NULL);
 257         if (!prop)
 258                 goto fail1;
 259         cf->gpio_vsense = *prop;
 260
 261         prop = of_get_property(np, "card-3v-gpio", NULL);
 262         if (!prop)
 263                 goto fail1;
 264         cf->gpio_3v = *prop;
 265
 266         prop = of_get_property(np, "card-5v-gpio", NULL);
 267         if (!prop)
 268                 goto fail1;
 269         cf->gpio_5v = *prop;
 270
 271         cf->socket.io_offset = cf->io_base;
 272
 273         /* reserve chip-select regions */
 274         if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
 275                 status = -ENXIO;
 276                 dev_err(device, "Can't claim memory region\n");
 277                 goto fail1;
 278         }
 279
 280         if (!request_region(cf->io_base, cf->io_size, driver_name)) {
 281                 status = -ENXIO;
 282                 dev_err(device, "Can't claim I/O region\n");
 283                 goto fail2;
 284         }
 285
 286         cf->socket.owner = THIS_MODULE;
 287         cf->socket.dev.parent = &ofdev->dev;
 288         cf->socket.ops = &electra_cf_ops;
 289         cf->socket.resource_ops = &pccard_static_ops;
 290         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
 291                                 SS_CAP_MEM_ALIGN;
 292         cf->socket.map_size = 0x800;
 293
 294         status = pcmcia_register_socket(&cf->socket);
 295         if (status < 0) {
 296                 dev_err(device, "pcmcia_register_socket failed\n");
 297                 goto fail3;
 298         }
 299
 300         dev_info(device, "at mem 0x%lx io 0x%lx irq %d\n",
 301                  cf->mem_phys, io.start, cf->irq);
 302
 303         cf->active = 1;
 304         electra_cf_timer((unsigned long)cf);
 305         return 0;
 306
 307 fail3:
 308         release_region(cf->io_base, cf->io_size);
 309 fail2:
 310         release_mem_region(cf->mem_phys, cf->mem_size);
 311 fail1:
 312         if (cf->irq != NO_IRQ)
 313                 free_irq(cf->irq, cf);
 314
 315         if (cf->io_virt)
 316                 __iounmap_at(cf->io_virt, cf->io_size);
 317         if (cf->mem_base)
 318                 iounmap(cf->mem_base);
 319         if (cf->gpio_base)
 320                 iounmap(cf->gpio_base);
 321         device_init_wakeup(&ofdev->dev, 0);
 322         kfree(cf);
 323         return status;
 324
 325 }
 326
 327 static int __devexit electra_cf_remove(struct of_device *ofdev)
 328 {
 329         struct device *device = &ofdev->dev;
 330         struct electra_cf_socket *cf;
 331
 332         cf = dev_get_drvdata(device);
 333
 334         cf->active = 0;
 335         pcmcia_unregister_socket(&cf->socket);
 336         free_irq(cf->irq, cf);
 337         del_timer_sync(&cf->timer);
 338
 339         __iounmap_at(cf->io_virt, cf->io_size);
 340         iounmap(cf->mem_base);
 341         iounmap(cf->gpio_base);
 342         release_mem_region(cf->mem_phys, cf->mem_size);
 343         release_region(cf->io_base, cf->io_size);
 344
 345         kfree(cf);
 346
 347         return 0;
 348 }
 349
 350 static struct of_device_id electra_cf_match[] = {
 351         {
 352                 .compatible   = "electra-cf",
 353         },
 354         {},
 355 };
 356 MODULE_DEVICE_TABLE(of, electra_cf_match);
 357
 358 static struct of_platform_driver electra_cf_driver = {
 359         .name      = (char *)driver_name,
 360         .match_table    = electra_cf_match,
 361         .probe    = electra_cf_probe,
 362         .remove   = electra_cf_remove,
 363 };
 364
 365 static int __init electra_cf_init(void)
 366 {
 367         return of_register_platform_driver(&electra_cf_driver);
 368 }
 369 module_init(electra_cf_init);
 370
 371 static void __exit electra_cf_exit(void)
 372 {
 373         of_unregister_platform_driver(&electra_cf_driver);
 374 }
 375 module_exit(electra_cf_exit);
 376
 377 MODULE_LICENSE("GPL");
 378 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
 379 MODULE_DESCRIPTION("PA Semi Electra CF driver");