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