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