linux/drivers/pcmcia/xxs1500_ss.c
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   1/*
   2 * PCMCIA socket code for the MyCable XXS1500 system.
   3 *
   4 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
   5 *
   6 */
   7
   8#include <linux/delay.h>
   9#include <linux/gpio.h>
  10#include <linux/interrupt.h>
  11#include <linux/io.h>
  12#include <linux/ioport.h>
  13#include <linux/mm.h>
  14#include <linux/platform_device.h>
  15#include <linux/pm.h>
  16#include <linux/resource.h>
  17#include <linux/slab.h>
  18#include <linux/spinlock.h>
  19
  20#include <pcmcia/ss.h>
  21#include <pcmcia/cistpl.h>
  22
  23#include <asm/irq.h>
  24#include <asm/system.h>
  25#include <asm/mach-au1x00/au1000.h>
  26
  27#define MEM_MAP_SIZE    0x400000
  28#define IO_MAP_SIZE     0x1000
  29
  30
  31/*
  32 * 3.3V cards only; all interfacing is done via gpios:
  33 *
  34 * 0/1:  carddetect (00 = card present, xx = huh)
  35 * 4:    card irq
  36 * 204:  reset (high-act)
  37 * 205:  buffer enable (low-act)
  38 * 208/209: card voltage key (00,01,10,11)
  39 * 210:  battwarn
  40 * 211:  batdead
  41 * 214:  power (low-act)
  42 */
  43#define GPIO_CDA        0
  44#define GPIO_CDB        1
  45#define GPIO_CARDIRQ    4
  46#define GPIO_RESET      204
  47#define GPIO_OUTEN      205
  48#define GPIO_VSL        208
  49#define GPIO_VSH        209
  50#define GPIO_BATTDEAD   210
  51#define GPIO_BATTWARN   211
  52#define GPIO_POWER      214
  53
  54struct xxs1500_pcmcia_sock {
  55        struct pcmcia_socket    socket;
  56        void            *virt_io;
  57
  58        phys_addr_t     phys_io;
  59        phys_addr_t     phys_attr;
  60        phys_addr_t     phys_mem;
  61
  62        /* previous flags for set_socket() */
  63        unsigned int old_flags;
  64};
  65
  66#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)
  67
  68static irqreturn_t cdirq(int irq, void *data)
  69{
  70        struct xxs1500_pcmcia_sock *sock = data;
  71
  72        pcmcia_parse_events(&sock->socket, SS_DETECT);
  73
  74        return IRQ_HANDLED;
  75}
  76
  77static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
  78                                    struct socket_state_t *state)
  79{
  80        struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
  81        unsigned int changed;
  82
  83        /* power control */
  84        switch (state->Vcc) {
  85        case 0:
  86                gpio_set_value(GPIO_POWER, 1);  /* power off */
  87                break;
  88        case 33:
  89                gpio_set_value(GPIO_POWER, 0);  /* power on */
  90                break;
  91        case 50:
  92        default:
  93                return -EINVAL;
  94        }
  95
  96        changed = state->flags ^ sock->old_flags;
  97
  98        if (changed & SS_RESET) {
  99                if (state->flags & SS_RESET) {
 100                        gpio_set_value(GPIO_RESET, 1);  /* assert reset */
 101                        gpio_set_value(GPIO_OUTEN, 1);  /* buffers off */
 102                } else {
 103                        gpio_set_value(GPIO_RESET, 0);  /* deassert reset */
 104                        gpio_set_value(GPIO_OUTEN, 0);  /* buffers on */
 105                        msleep(500);
 106                }
 107        }
 108
 109        sock->old_flags = state->flags;
 110
 111        return 0;
 112}
 113
 114static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
 115                                     unsigned int *value)
 116{
 117        unsigned int status;
 118        int i;
 119
 120        status = 0;
 121
 122        /* check carddetects: GPIO[0:1] must both be low */
 123        if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
 124                status |= SS_DETECT;
 125
 126        /* determine card voltage: GPIO[208:209] binary value */
 127        i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);
 128
 129        switch (i) {
 130        case 0:
 131        case 1:
 132        case 2:
 133                status |= SS_3VCARD;    /* 3V card */
 134                break;
 135        case 3:                         /* 5V card, unsupported */
 136        default:
 137                status |= SS_XVCARD;    /* treated as unsupported in core */
 138        }
 139
 140        /* GPIO214: low active power switch */
 141        status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;
 142
 143        /* GPIO204: high-active reset line */
 144        status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;
 145
 146        /* other stuff */
 147        status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
 148        status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;
 149
 150        *value = status;
 151
 152        return 0;
 153}
 154
 155static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
 156{
 157        gpio_direction_input(GPIO_CDA);
 158        gpio_direction_input(GPIO_CDB);
 159        gpio_direction_input(GPIO_VSL);
 160        gpio_direction_input(GPIO_VSH);
 161        gpio_direction_input(GPIO_BATTDEAD);
 162        gpio_direction_input(GPIO_BATTWARN);
 163        gpio_direction_output(GPIO_RESET, 1);   /* assert reset */
 164        gpio_direction_output(GPIO_OUTEN, 1);   /* disable buffers */
 165        gpio_direction_output(GPIO_POWER, 1);   /* power off */
 166
 167        return 0;
 168}
 169
 170static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
 171{
 172        return 0;
 173}
 174
 175static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
 176                                    struct pccard_io_map *map)
 177{
 178        struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
 179
 180        map->start = (u32)sock->virt_io;
 181        map->stop = map->start + IO_MAP_SIZE;
 182
 183        return 0;
 184}
 185
 186static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
 187                                     struct pccard_mem_map *map)
 188{
 189        struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
 190
 191        if (map->flags & MAP_ATTRIB)
 192                map->static_start = sock->phys_attr + map->card_start;
 193        else
 194                map->static_start = sock->phys_mem + map->card_start;
 195
 196        return 0;
 197}
 198
 199static struct pccard_operations xxs1500_pcmcia_operations = {
 200        .init                   = xxs1500_pcmcia_sock_init,
 201        .suspend                = xxs1500_pcmcia_sock_suspend,
 202        .get_status             = xxs1500_pcmcia_get_status,
 203        .set_socket             = xxs1500_pcmcia_configure,
 204        .set_io_map             = au1x00_pcmcia_set_io_map,
 205        .set_mem_map            = au1x00_pcmcia_set_mem_map,
 206};
 207
 208static int __devinit xxs1500_pcmcia_probe(struct platform_device *pdev)
 209{
 210        struct xxs1500_pcmcia_sock *sock;
 211        struct resource *r;
 212        int ret, irq;
 213
 214        sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
 215        if (!sock)
 216                return -ENOMEM;
 217
 218        ret = -ENODEV;
 219
 220        /* 36bit PCMCIA Attribute area address */
 221        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
 222        if (!r) {
 223                dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
 224                goto out0;
 225        }
 226        sock->phys_attr = r->start;
 227
 228        /* 36bit PCMCIA Memory area address */
 229        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
 230        if (!r) {
 231                dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
 232                goto out0;
 233        }
 234        sock->phys_mem = r->start;
 235
 236        /* 36bit PCMCIA IO area address */
 237        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
 238        if (!r) {
 239                dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
 240                goto out0;
 241        }
 242        sock->phys_io = r->start;
 243
 244
 245        /*
 246         * PCMCIA client drivers use the inb/outb macros to access
 247         * the IO registers.  Since mips_io_port_base is added
 248         * to the access address of the mips implementation of
 249         * inb/outb, we need to subtract it here because we want
 250         * to access the I/O or MEM address directly, without
 251         * going through this "mips_io_port_base" mechanism.
 252         */
 253        sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
 254                                 mips_io_port_base);
 255
 256        if (!sock->virt_io) {
 257                dev_err(&pdev->dev, "cannot remap IO area\n");
 258                ret = -ENOMEM;
 259                goto out0;
 260        }
 261
 262        sock->socket.ops        = &xxs1500_pcmcia_operations;
 263        sock->socket.owner      = THIS_MODULE;
 264        sock->socket.pci_irq    = gpio_to_irq(GPIO_CARDIRQ);
 265        sock->socket.features   = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
 266        sock->socket.map_size   = MEM_MAP_SIZE;
 267        sock->socket.io_offset  = (unsigned long)sock->virt_io;
 268        sock->socket.dev.parent = &pdev->dev;
 269        sock->socket.resource_ops = &pccard_static_ops;
 270
 271        platform_set_drvdata(pdev, sock);
 272
 273        /* setup carddetect irq: use one of the 2 GPIOs as an
 274         * edge detector.
 275         */
 276        irq = gpio_to_irq(GPIO_CDA);
 277        set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
 278        ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
 279        if (ret) {
 280                dev_err(&pdev->dev, "cannot setup cd irq\n");
 281                goto out1;
 282        }
 283
 284        ret = pcmcia_register_socket(&sock->socket);
 285        if (ret) {
 286                dev_err(&pdev->dev, "failed to register\n");
 287                goto out2;
 288        }
 289
 290        printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");
 291
 292        return 0;
 293
 294out2:
 295        free_irq(gpio_to_irq(GPIO_CDA), sock);
 296out1:
 297        iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
 298out0:
 299        kfree(sock);
 300        return ret;
 301}
 302
 303static int __devexit xxs1500_pcmcia_remove(struct platform_device *pdev)
 304{
 305        struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);
 306
 307        pcmcia_unregister_socket(&sock->socket);
 308        free_irq(gpio_to_irq(GPIO_CDA), sock);
 309        iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
 310        kfree(sock);
 311
 312        return 0;
 313}
 314
 315static struct platform_driver xxs1500_pcmcia_socket_driver = {
 316        .driver = {
 317                .name   = "xxs1500_pcmcia",
 318                .owner  = THIS_MODULE,
 319        },
 320        .probe          = xxs1500_pcmcia_probe,
 321        .remove         = __devexit_p(xxs1500_pcmcia_remove),
 322};
 323
 324int __init xxs1500_pcmcia_socket_load(void)
 325{
 326        return platform_driver_register(&xxs1500_pcmcia_socket_driver);
 327}
 328
 329void  __exit xxs1500_pcmcia_socket_unload(void)
 330{
 331        platform_driver_unregister(&xxs1500_pcmcia_socket_driver);
 332}
 333
 334module_init(xxs1500_pcmcia_socket_load);
 335module_exit(xxs1500_pcmcia_socket_unload);
 336
 337MODULE_LICENSE("GPL");
 338MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
 339MODULE_AUTHOR("Manuel Lauss");
 340