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