linux/drivers/pcmcia/xxs1500_ss.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * PCMCIA socket code for the MyCable XXS1500 system.
   4 *
   5 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
   6 *
   7 */
   8
   9#include <linux/delay.h>
  10#include <linux/gpio.h>
  11#include <linux/interrupt.h>
  12#include <linux/io.h>
  13#include <linux/ioport.h>
  14#include <linux/mm.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17#include <linux/pm.h>
  18#include <linux/resource.h>
  19#include <linux/slab.h>
  20#include <linux/spinlock.h>
  21
  22#include <pcmcia/ss.h>
  23#include <pcmcia/cistpl.h>
  24
  25#include <asm/irq.h>
  26#include <asm/mach-au1x00/au1000.h>
  27
  28#define MEM_MAP_SIZE    0x400000
  29#define IO_MAP_SIZE     0x1000
  30
  31
  32/*
  33 * 3.3V cards only; all interfacing is done via gpios:
  34 *
  35 * 0/1:  carddetect (00 = card present, xx = huh)
  36 * 4:    card irq
  37 * 204:  reset (high-act)
  38 * 205:  buffer enable (low-act)
  39 * 208/209: card voltage key (00,01,10,11)
  40 * 210:  battwarn
  41 * 211:  batdead
  42 * 214:  power (low-act)
  43 */
  44#define GPIO_CDA        0
  45#define GPIO_CDB        1
  46#define GPIO_CARDIRQ    4
  47#define GPIO_RESET      204
  48#define GPIO_OUTEN      205
  49#define GPIO_VSL        208
  50#define GPIO_VSH        209
  51#define GPIO_BATTDEAD   210
  52#define GPIO_BATTWARN   211
  53#define GPIO_POWER      214
  54
  55struct xxs1500_pcmcia_sock {
  56        struct pcmcia_socket    socket;
  57        void            *virt_io;
  58
  59        phys_addr_t     phys_io;
  60        phys_addr_t     phys_attr;
  61        phys_addr_t     phys_mem;
  62
  63        /* previous flags for set_socket() */
  64        unsigned int old_flags;
  65};
  66
  67#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)
  68
  69static irqreturn_t cdirq(int irq, void *data)
  70{
  71        struct xxs1500_pcmcia_sock *sock = data;
  72
  73        pcmcia_parse_events(&sock->socket, SS_DETECT);
  74
  75        return IRQ_HANDLED;
  76}
  77
  78static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
  79                                    struct socket_state_t *state)
  80{
  81        struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
  82        unsigned int changed;
  83
  84        /* power control */
  85        switch (state->Vcc) {
  86        case 0:
  87                gpio_set_value(GPIO_POWER, 1);  /* power off */
  88                break;
  89        case 33:
  90                gpio_set_value(GPIO_POWER, 0);  /* power on */
  91                break;
  92        case 50:
  93        default:
  94                return -EINVAL;
  95        }
  96
  97        changed = state->flags ^ sock->old_flags;
  98
  99        if (changed & SS_RESET) {
 100                if (state->flags & SS_RESET) {
 101                        gpio_set_value(GPIO_RESET, 1);  /* assert reset */
 102                        gpio_set_value(GPIO_OUTEN, 1);  /* buffers off */
 103                } else {
 104                        gpio_set_value(GPIO_RESET, 0);  /* deassert reset */
 105                        gpio_set_value(GPIO_OUTEN, 0);  /* buffers on */
 106                        msleep(500);
 107                }
 108        }
 109
 110        sock->old_flags = state->flags;
 111
 112        return 0;
 113}
 114
 115static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
 116                                     unsigned int *value)
 117{
 118        unsigned int status;
 119        int i;
 120
 121        status = 0;
 122
 123        /* check carddetects: GPIO[0:1] must both be low */
 124        if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
 125                status |= SS_DETECT;
 126
 127        /* determine card voltage: GPIO[208:209] binary value */
 128        i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);
 129
 130        switch (i) {
 131        case 0:
 132        case 1:
 133        case 2:
 134                status |= SS_3VCARD;    /* 3V card */
 135                break;
 136        case 3:                         /* 5V card, unsupported */
 137        default:
 138                status |= SS_XVCARD;    /* treated as unsupported in core */
 139        }
 140
 141        /* GPIO214: low active power switch */
 142        status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;
 143
 144        /* GPIO204: high-active reset line */
 145        status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;
 146
 147        /* other stuff */
 148        status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
 149        status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;
 150
 151        *value = status;
 152
 153        return 0;
 154}
 155
 156static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
 157{
 158        gpio_direction_input(GPIO_CDA);
 159        gpio_direction_input(GPIO_CDB);
 160        gpio_direction_input(GPIO_VSL);
 161        gpio_direction_input(GPIO_VSH);
 162        gpio_direction_input(GPIO_BATTDEAD);
 163        gpio_direction_input(GPIO_BATTWARN);
 164        gpio_direction_output(GPIO_RESET, 1);   /* assert reset */
 165        gpio_direction_output(GPIO_OUTEN, 1);   /* disable buffers */
 166        gpio_direction_output(GPIO_POWER, 1);   /* power off */
 167
 168        return 0;
 169}
 170
 171static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
 172{
 173        return 0;
 174}
 175
 176static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
 177                                    struct pccard_io_map *map)
 178{
 179        struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
 180
 181        map->start = (u32)sock->virt_io;
 182        map->stop = map->start + IO_MAP_SIZE;
 183
 184        return 0;
 185}
 186
 187static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
 188                                     struct pccard_mem_map *map)
 189{
 190        struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
 191
 192        if (map->flags & MAP_ATTRIB)
 193                map->static_start = sock->phys_attr + map->card_start;
 194        else
 195                map->static_start = sock->phys_mem + map->card_start;
 196
 197        return 0;
 198}
 199
 200static struct pccard_operations xxs1500_pcmcia_operations = {
 201        .init                   = xxs1500_pcmcia_sock_init,
 202        .suspend                = xxs1500_pcmcia_sock_suspend,
 203        .get_status             = xxs1500_pcmcia_get_status,
 204        .set_socket             = xxs1500_pcmcia_configure,
 205        .set_io_map             = au1x00_pcmcia_set_io_map,
 206        .set_mem_map            = au1x00_pcmcia_set_mem_map,
 207};
 208
 209static int xxs1500_pcmcia_probe(struct platform_device *pdev)
 210{
 211        struct xxs1500_pcmcia_sock *sock;
 212        struct resource *r;
 213        int ret, irq;
 214
 215        sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
 216        if (!sock)
 217                return -ENOMEM;
 218
 219        ret = -ENODEV;
 220
 221        /* 36bit PCMCIA Attribute area address */
 222        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
 223        if (!r) {
 224                dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
 225                goto out0;
 226        }
 227        sock->phys_attr = r->start;
 228
 229        /* 36bit PCMCIA Memory area address */
 230        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
 231        if (!r) {
 232                dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
 233                goto out0;
 234        }
 235        sock->phys_mem = r->start;
 236
 237        /* 36bit PCMCIA IO area address */
 238        r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
 239        if (!r) {
 240                dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
 241                goto out0;
 242        }
 243        sock->phys_io = r->start;
 244
 245
 246        /*
 247         * PCMCIA client drivers use the inb/outb macros to access
 248         * the IO registers.  Since mips_io_port_base is added
 249         * to the access address of the mips implementation of
 250         * inb/outb, we need to subtract it here because we want
 251         * to access the I/O or MEM address directly, without
 252         * going through this "mips_io_port_base" mechanism.
 253         */
 254        sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
 255                                 mips_io_port_base);
 256
 257        if (!sock->virt_io) {
 258                dev_err(&pdev->dev, "cannot remap IO area\n");
 259                ret = -ENOMEM;
 260                goto out0;
 261        }
 262
 263        sock->socket.ops        = &xxs1500_pcmcia_operations;
 264        sock->socket.owner      = THIS_MODULE;
 265        sock->socket.pci_irq    = gpio_to_irq(GPIO_CARDIRQ);
 266        sock->socket.features   = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
 267        sock->socket.map_size   = MEM_MAP_SIZE;
 268        sock->socket.io_offset  = (unsigned long)sock->virt_io;
 269        sock->socket.dev.parent = &pdev->dev;
 270        sock->socket.resource_ops = &pccard_static_ops;
 271
 272        platform_set_drvdata(pdev, sock);
 273
 274        /* setup carddetect irq: use one of the 2 GPIOs as an
 275         * edge detector.
 276         */
 277        irq = gpio_to_irq(GPIO_CDA);
 278        irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
 279        ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
 280        if (ret) {
 281                dev_err(&pdev->dev, "cannot setup cd irq\n");
 282                goto out1;
 283        }
 284
 285        ret = pcmcia_register_socket(&sock->socket);
 286        if (ret) {
 287                dev_err(&pdev->dev, "failed to register\n");
 288                goto out2;
 289        }
 290
 291        printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");
 292
 293        return 0;
 294
 295out2:
 296        free_irq(gpio_to_irq(GPIO_CDA), sock);
 297out1:
 298        iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
 299out0:
 300        kfree(sock);
 301        return ret;
 302}
 303
 304static int xxs1500_pcmcia_remove(struct platform_device *pdev)
 305{
 306        struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);
 307
 308        pcmcia_unregister_socket(&sock->socket);
 309        free_irq(gpio_to_irq(GPIO_CDA), sock);
 310        iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
 311        kfree(sock);
 312
 313        return 0;
 314}
 315
 316static struct platform_driver xxs1500_pcmcia_socket_driver = {
 317        .driver = {
 318                .name   = "xxs1500_pcmcia",
 319        },
 320        .probe          = xxs1500_pcmcia_probe,
 321        .remove         = xxs1500_pcmcia_remove,
 322};
 323
 324module_platform_driver(xxs1500_pcmcia_socket_driver);
 325
 326MODULE_LICENSE("GPL");
 327MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
 328MODULE_AUTHOR("Manuel Lauss");
 329