linux/drivers/pcmcia/electra_cf.c
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   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
  38static const char driver_name[] = "electra-cf";
  39
  40struct 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 platform_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
  66static 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
  74static 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 */
  80static 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
  94static irqreturn_t electra_cf_irq(int irq, void *_cf)
  95{
  96        electra_cf_timer((unsigned long)_cf);
  97        return IRQ_HANDLED;
  98}
  99
 100static 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
 119static 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
 155static int electra_cf_set_io_map(struct pcmcia_socket *s,
 156                                 struct pccard_io_map *io)
 157{
 158        return 0;
 159}
 160
 161static 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
 176static 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
 184static int __devinit electra_cf_probe(struct platform_device *ofdev,
 185                                      const struct of_device_id *match)
 186{
 187        struct device *device = &ofdev->dev;
 188        struct device_node *np = ofdev->dev.of_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
 308fail3:
 309        release_region(cf->io_base, cf->io_size);
 310fail2:
 311        release_mem_region(cf->mem_phys, cf->mem_size);
 312fail1:
 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
 328static int __devexit electra_cf_remove(struct platform_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
 351static const struct of_device_id electra_cf_match[] = {
 352        {
 353                .compatible   = "electra-cf",
 354        },
 355        {},
 356};
 357MODULE_DEVICE_TABLE(of, electra_cf_match);
 358
 359static struct of_platform_driver electra_cf_driver = {
 360        .driver = {
 361                .name = (char *)driver_name,
 362                .owner = THIS_MODULE,
 363                .of_match_table = electra_cf_match,
 364        },
 365        .probe    = electra_cf_probe,
 366        .remove   = electra_cf_remove,
 367};
 368
 369static int __init electra_cf_init(void)
 370{
 371        return of_register_platform_driver(&electra_cf_driver);
 372}
 373module_init(electra_cf_init);
 374
 375static void __exit electra_cf_exit(void)
 376{
 377        of_unregister_platform_driver(&electra_cf_driver);
 378}
 379module_exit(electra_cf_exit);
 380
 381MODULE_LICENSE("GPL");
 382MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
 383MODULE_DESCRIPTION("PA Semi Electra CF driver");
 384