linux/drivers/pcmcia/pxa2xx_mainstone.c
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   1/*
   2 * linux/drivers/pcmcia/pxa2xx_mainstone.c
   3 *
   4 * Mainstone PCMCIA specific routines.
   5 *
   6 * Created:     May 12, 2004
   7 * Author:      Nicolas Pitre
   8 * Copyright:   MontaVista Software Inc.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License version 2 as
  12 * published by the Free Software Foundation.
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/init.h>
  17#include <linux/kernel.h>
  18#include <linux/errno.h>
  19#include <linux/interrupt.h>
  20#include <linux/platform_device.h>
  21
  22#include <pcmcia/ss.h>
  23
  24#include <mach/hardware.h>
  25#include <asm/mach-types.h>
  26#include <asm/irq.h>
  27
  28#include <mach/pxa-regs.h>
  29#include <mach/mainstone.h>
  30
  31#include "soc_common.h"
  32
  33
  34static struct pcmcia_irqs irqs[] = {
  35        { 0, MAINSTONE_S0_CD_IRQ, "PCMCIA0 CD" },
  36        { 1, MAINSTONE_S1_CD_IRQ, "PCMCIA1 CD" },
  37        { 0, MAINSTONE_S0_STSCHG_IRQ, "PCMCIA0 STSCHG" },
  38        { 1, MAINSTONE_S1_STSCHG_IRQ, "PCMCIA1 STSCHG" },
  39};
  40
  41static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  42{
  43        /*
  44         * Setup default state of GPIO outputs
  45         * before we enable them as outputs.
  46         */
  47
  48        skt->irq = (skt->nr == 0) ? MAINSTONE_S0_IRQ : MAINSTONE_S1_IRQ;
  49        return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  50}
  51
  52static void mst_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  53{
  54        soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  55}
  56
  57static unsigned long mst_pcmcia_status[2];
  58
  59static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  60                                    struct pcmcia_state *state)
  61{
  62        unsigned long status, flip;
  63
  64        status = (skt->nr == 0) ? MST_PCMCIA0 : MST_PCMCIA1;
  65        flip = (status ^ mst_pcmcia_status[skt->nr]) & MST_PCMCIA_nSTSCHG_BVD1;
  66
  67        /*
  68         * Workaround for STSCHG which can't be deasserted:
  69         * We therefore disable/enable corresponding IRQs
  70         * as needed to avoid IRQ locks.
  71         */
  72        if (flip) {
  73                mst_pcmcia_status[skt->nr] = status;
  74                if (status & MST_PCMCIA_nSTSCHG_BVD1)
  75                        enable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
  76                                                   : MAINSTONE_S1_STSCHG_IRQ );
  77                else
  78                        disable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
  79                                                    : MAINSTONE_S1_STSCHG_IRQ );
  80        }
  81
  82        state->detect = (status & MST_PCMCIA_nCD) ? 0 : 1;
  83        state->ready  = (status & MST_PCMCIA_nIRQ) ? 1 : 0;
  84        state->bvd1   = (status & MST_PCMCIA_nSTSCHG_BVD1) ? 1 : 0;
  85        state->bvd2   = (status & MST_PCMCIA_nSPKR_BVD2) ? 1 : 0;
  86        state->vs_3v  = (status & MST_PCMCIA_nVS1) ? 0 : 1;
  87        state->vs_Xv  = (status & MST_PCMCIA_nVS2) ? 0 : 1;
  88        state->wrprot = 0;  /* not available */
  89}
  90
  91static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  92                                       const socket_state_t *state)
  93{
  94        unsigned long power = 0;
  95        int ret = 0;
  96
  97        switch (state->Vcc) {
  98        case 0:  power |= MST_PCMCIA_PWR_VCC_0;  break;
  99        case 33: power |= MST_PCMCIA_PWR_VCC_33; break;
 100        case 50: power |= MST_PCMCIA_PWR_VCC_50; break;
 101        default:
 102                 printk(KERN_ERR "%s(): bad Vcc %u\n",
 103                                 __func__, state->Vcc);
 104                 ret = -1;
 105        }
 106
 107        switch (state->Vpp) {
 108        case 0:   power |= MST_PCMCIA_PWR_VPP_0;   break;
 109        case 120: power |= MST_PCMCIA_PWR_VPP_120; break;
 110        default:
 111                  if(state->Vpp == state->Vcc) {
 112                          power |= MST_PCMCIA_PWR_VPP_VCC;
 113                  } else {
 114                          printk(KERN_ERR "%s(): bad Vpp %u\n",
 115                                          __func__, state->Vpp);
 116                          ret = -1;
 117                  }
 118        }
 119
 120        if (state->flags & SS_RESET)
 121               power |= MST_PCMCIA_RESET;
 122
 123        switch (skt->nr) {
 124        case 0:  MST_PCMCIA0 = power; break;
 125        case 1:  MST_PCMCIA1 = power; break;
 126        default: ret = -1;
 127        }
 128
 129        return ret;
 130}
 131
 132static void mst_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 133{
 134}
 135
 136static void mst_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 137{
 138}
 139
 140static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
 141        .owner                  = THIS_MODULE,
 142        .hw_init                = mst_pcmcia_hw_init,
 143        .hw_shutdown            = mst_pcmcia_hw_shutdown,
 144        .socket_state           = mst_pcmcia_socket_state,
 145        .configure_socket       = mst_pcmcia_configure_socket,
 146        .socket_init            = mst_pcmcia_socket_init,
 147        .socket_suspend         = mst_pcmcia_socket_suspend,
 148        .nr                     = 2,
 149};
 150
 151static struct platform_device *mst_pcmcia_device;
 152
 153static int __init mst_pcmcia_init(void)
 154{
 155        int ret;
 156
 157        if (!machine_is_mainstone())
 158                return -ENODEV;
 159
 160        mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 161        if (!mst_pcmcia_device)
 162                return -ENOMEM;
 163
 164        ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
 165                                       sizeof(mst_pcmcia_ops));
 166        if (ret == 0)
 167                ret = platform_device_add(mst_pcmcia_device);
 168
 169        if (ret)
 170                platform_device_put(mst_pcmcia_device);
 171
 172        return ret;
 173}
 174
 175static void __exit mst_pcmcia_exit(void)
 176{
 177        platform_device_unregister(mst_pcmcia_device);
 178}
 179
 180fs_initcall(mst_pcmcia_init);
 181module_exit(mst_pcmcia_exit);
 182
 183MODULE_LICENSE("GPL");
 184MODULE_ALIAS("platform:pxa2xx-pcmcia");
 185