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