drivers/pcmcia/xxs1500_ss.c

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