drivers/pcmcia/pxa2xx_mainstone.c

   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
  33 static 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
  55 static unsigned long mst_pcmcia_status[2];
  56
  57 static 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
  88 static 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
 129 static 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
 137 static struct platform_device *mst_pcmcia_device;
 138
 139 static 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
 161 static void __exit mst_pcmcia_exit(void)
 162 {
 163         platform_device_unregister(mst_pcmcia_device);
 164 }
 165
 166 fs_initcall(mst_pcmcia_init);
 167 module_exit(mst_pcmcia_exit);
 168
 169 MODULE_LICENSE("GPL");
 170 MODULE_ALIAS("platform:pxa2xx-pcmcia");