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