linux/drivers/pcmcia/sa1100_assabet.c
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   1/*
   2 * drivers/pcmcia/sa1100_assabet.c
   3 *
   4 * PCMCIA implementation routines for Assabet
   5 *
   6 */
   7#include <linux/module.h>
   8#include <linux/kernel.h>
   9#include <linux/errno.h>
  10#include <linux/interrupt.h>
  11#include <linux/device.h>
  12#include <linux/init.h>
  13
  14#include <mach/hardware.h>
  15#include <asm/mach-types.h>
  16#include <asm/irq.h>
  17#include <asm/signal.h>
  18#include <mach/assabet.h>
  19
  20#include "sa1100_generic.h"
  21
  22static struct pcmcia_irqs irqs[] = {
  23        { 1, ASSABET_IRQ_GPIO_CF_CD,   "CF CD"   },
  24        { 1, ASSABET_IRQ_GPIO_CF_BVD2, "CF BVD2" },
  25        { 1, ASSABET_IRQ_GPIO_CF_BVD1, "CF BVD1" },
  26};
  27
  28static int assabet_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  29{
  30        skt->socket.pci_irq = ASSABET_IRQ_GPIO_CF_IRQ;
  31
  32        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  33}
  34
  35/*
  36 * Release all resources.
  37 */
  38static void assabet_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  39{
  40        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  41}
  42
  43static void
  44assabet_pcmcia_socket_state(struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
  45{
  46        unsigned long levels = GPLR;
  47
  48        state->detect = (levels & ASSABET_GPIO_CF_CD) ? 0 : 1;
  49        state->ready  = (levels & ASSABET_GPIO_CF_IRQ) ? 1 : 0;
  50        state->bvd1   = (levels & ASSABET_GPIO_CF_BVD1) ? 1 : 0;
  51        state->bvd2   = (levels & ASSABET_GPIO_CF_BVD2) ? 1 : 0;
  52        state->wrprot = 0; /* Not available on Assabet. */
  53        state->vs_3v  = 1; /* Can only apply 3.3V on Assabet. */
  54        state->vs_Xv  = 0;
  55}
  56
  57static int
  58assabet_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
  59{
  60        unsigned int mask;
  61
  62        switch (state->Vcc) {
  63        case 0:
  64                mask = 0;
  65                break;
  66
  67        case 50:
  68                printk(KERN_WARNING "%s(): CS asked for 5V, applying 3.3V...\n",
  69                        __func__);
  70
  71        case 33:  /* Can only apply 3.3V to the CF slot. */
  72                mask = ASSABET_BCR_CF_PWR;
  73                break;
  74
  75        default:
  76                printk(KERN_ERR "%s(): unrecognized Vcc %u\n", __func__,
  77                        state->Vcc);
  78                return -1;
  79        }
  80
  81        /* Silently ignore Vpp, output enable, speaker enable. */
  82
  83        if (state->flags & SS_RESET)
  84                mask |= ASSABET_BCR_CF_RST;
  85
  86        ASSABET_BCR_frob(ASSABET_BCR_CF_RST | ASSABET_BCR_CF_PWR, mask);
  87
  88        return 0;
  89}
  90
  91/*
  92 * Enable card status IRQs on (re-)initialisation.  This can
  93 * be called at initialisation, power management event, or
  94 * pcmcia event.
  95 */
  96static void assabet_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
  97{
  98        /*
  99         * Enable CF bus
 100         */
 101        ASSABET_BCR_clear(ASSABET_BCR_CF_BUS_OFF);
 102
 103        soc_pcmcia_enable_irqs(skt, irqs, ARRAY_SIZE(irqs));
 104}
 105
 106/*
 107 * Disable card status IRQs on suspend.
 108 */
 109static void assabet_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 110{
 111        soc_pcmcia_disable_irqs(skt, irqs, ARRAY_SIZE(irqs));
 112
 113        /*
 114         * Tristate the CF bus signals.  Also assert CF
 115         * reset as per user guide page 4-11.
 116         */
 117        ASSABET_BCR_set(ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_CF_RST);
 118}
 119
 120static struct pcmcia_low_level assabet_pcmcia_ops = { 
 121        .owner                  = THIS_MODULE,
 122
 123        .hw_init                = assabet_pcmcia_hw_init,
 124        .hw_shutdown            = assabet_pcmcia_hw_shutdown,
 125
 126        .socket_state           = assabet_pcmcia_socket_state,
 127        .configure_socket       = assabet_pcmcia_configure_socket,
 128
 129        .socket_init            = assabet_pcmcia_socket_init,
 130        .socket_suspend         = assabet_pcmcia_socket_suspend,
 131};
 132
 133int __devinit pcmcia_assabet_init(struct device *dev)
 134{
 135        int ret = -ENODEV;
 136
 137        if (machine_is_assabet() && !machine_has_neponset())
 138                ret = sa11xx_drv_pcmcia_probe(dev, &assabet_pcmcia_ops, 1, 1);
 139
 140        return ret;
 141}
 142