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 int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  34{
  35        /*
  36         * Setup default state of GPIO outputs
  37         * before we enable them as outputs.
  38         */
  39        if (skt->nr == 0) {
  40                skt->socket.pci_irq = MAINSTONE_S0_IRQ;
  41                skt->stat[SOC_STAT_CD].irq = MAINSTONE_S0_CD_IRQ;
  42                skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  43                skt->stat[SOC_STAT_BVD1].irq = MAINSTONE_S0_STSCHG_IRQ;
  44                skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
  45        } else {
  46                skt->socket.pci_irq = MAINSTONE_S1_IRQ;
  47                skt->stat[SOC_STAT_CD].irq = MAINSTONE_S1_CD_IRQ;
  48                skt->stat[SOC_STAT_CD].name = "PCMCIA1 CD";
  49                skt->stat[SOC_STAT_BVD1].irq = MAINSTONE_S1_STSCHG_IRQ;
  50                skt->stat[SOC_STAT_BVD1].name = "PCMCIA1 STSCHG";
  51        }
  52        return 0;
  53}
  54
  55static unsigned long mst_pcmcia_status[2];
  56
  57static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  58                                    struct pcmcia_state *state)
  59{
  60        unsigned long status, flip;
  61
  62        status = (skt->nr == 0) ? MST_PCMCIA0 : MST_PCMCIA1;
  63        flip = (status ^ mst_pcmcia_status[skt->nr]) & MST_PCMCIA_nSTSCHG_BVD1;
  64
  65        /*
  66         * Workaround for STSCHG which can't be deasserted:
  67         * We therefore disable/enable corresponding IRQs
  68         * as needed to avoid IRQ locks.
  69         */
  70        if (flip) {
  71                mst_pcmcia_status[skt->nr] = status;
  72                if (status & MST_PCMCIA_nSTSCHG_BVD1)
  73                        enable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
  74                                                   : MAINSTONE_S1_STSCHG_IRQ );
  75                else
  76                        disable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
  77                                                    : MAINSTONE_S1_STSCHG_IRQ );
  78        }
  79
  80        state->detect = (status & MST_PCMCIA_nCD) ? 0 : 1;
  81        state->ready  = (status & MST_PCMCIA_nIRQ) ? 1 : 0;
  82        state->bvd1   = (status & MST_PCMCIA_nSTSCHG_BVD1) ? 1 : 0;
  83        state->bvd2   = (status & MST_PCMCIA_nSPKR_BVD2) ? 1 : 0;
  84        state->vs_3v  = (status & MST_PCMCIA_nVS1) ? 0 : 1;
  85        state->vs_Xv  = (status & MST_PCMCIA_nVS2) ? 0 : 1;
  86}
  87
  88static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  89                                       const socket_state_t *state)
  90{
  91        unsigned long power = 0;
  92        int ret = 0;
  93
  94        switch (state->Vcc) {
  95        case 0:  power |= MST_PCMCIA_PWR_VCC_0;  break;
  96        case 33: power |= MST_PCMCIA_PWR_VCC_33; break;
  97        case 50: power |= MST_PCMCIA_PWR_VCC_50; break;
  98        default:
  99                 printk(KERN_ERR "%s(): bad Vcc %u\n",
 100                                 __func__, state->Vcc);
 101                 ret = -1;
 102        }
 103
 104        switch (state->Vpp) {
 105        case 0:   power |= MST_PCMCIA_PWR_VPP_0;   break;
 106        case 120: power |= MST_PCMCIA_PWR_VPP_120; break;
 107        default:
 108                  if(state->Vpp == state->Vcc) {
 109                          power |= MST_PCMCIA_PWR_VPP_VCC;
 110                  } else {
 111                          printk(KERN_ERR "%s(): bad Vpp %u\n",
 112                                          __func__, state->Vpp);
 113                          ret = -1;
 114                  }
 115        }
 116
 117        if (state->flags & SS_RESET)
 118               power |= MST_PCMCIA_RESET;
 119
 120        switch (skt->nr) {
 121        case 0:  MST_PCMCIA0 = power; break;
 122        case 1:  MST_PCMCIA1 = power; break;
 123        default: ret = -1;
 124        }
 125
 126        return ret;
 127}
 128
 129static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
 130        .owner                  = THIS_MODULE,
 131        .hw_init                = mst_pcmcia_hw_init,
 132        .socket_state           = mst_pcmcia_socket_state,
 133        .configure_socket       = mst_pcmcia_configure_socket,
 134        .nr                     = 2,
 135};
 136
 137static struct platform_device *mst_pcmcia_device;
 138
 139static int __init mst_pcmcia_init(void)
 140{
 141        int ret;
 142
 143        if (!machine_is_mainstone())
 144                return -ENODEV;
 145
 146        mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 147        if (!mst_pcmcia_device)
 148                return -ENOMEM;
 149
 150        ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
 151                                       sizeof(mst_pcmcia_ops));
 152        if (ret == 0)
 153                ret = platform_device_add(mst_pcmcia_device);
 154
 155        if (ret)
 156                platform_device_put(mst_pcmcia_device);
 157
 158        return ret;
 159}
 160
 161static void __exit mst_pcmcia_exit(void)
 162{
 163        platform_device_unregister(mst_pcmcia_device);
 164}
 165
 166fs_initcall(mst_pcmcia_init);
 167module_exit(mst_pcmcia_exit);
 168
 169MODULE_LICENSE("GPL");
 170MODULE_ALIAS("platform:pxa2xx-pcmcia");
 171
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