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/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm.h>
  17 #include <linux/resource.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20
  21 #include <pcmcia/ss.h>
  22 #include <pcmcia/cistpl.h>
  23
  24 #include <asm/irq.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
  54 struct 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
  68 static 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
  77 static 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
 114 static 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
 155 static 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
 170 static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
 171 {
 172         return 0;
 173 }
 174
 175 static 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
 186 static 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
 199 static 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
 208 static int 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         irq_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
 294 out2:
 295         free_irq(gpio_to_irq(GPIO_CDA), sock);
 296 out1:
 297         iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
 298 out0:
 299         kfree(sock);
 300         return ret;
 301 }
 302
 303 static int 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
 315 static struct platform_driver xxs1500_pcmcia_socket_driver = {
 316         .driver = {
 317                 .name   = "xxs1500_pcmcia",
 318         },
 319         .probe          = xxs1500_pcmcia_probe,
 320         .remove         = xxs1500_pcmcia_remove,
 321 };
 322
 323 module_platform_driver(xxs1500_pcmcia_socket_driver);
 324
 325 MODULE_LICENSE("GPL");
 326 MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
 327 MODULE_AUTHOR("Manuel Lauss");