drivers/pcmcia/sa1100_assabet.c

   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 <asm/arch/hardware.h>
  15 #include <asm/mach-types.h>
  16 #include <asm/irq.h>
  17 #include <asm/signal.h>
  18 #include <asm/arch/assabet.h>
  19
  20 #include "sa1100_generic.h"
  21
  22 static 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
  28 static int assabet_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  29 {
  30         skt->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  */
  38 static void assabet_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  39 {
  40         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  41 }
  42
  43 static void
  44 assabet_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
  57 static int
  58 assabet_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  */
  96 static 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  */
 109 static 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
 120 static 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
 133 int __init 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 }