kernel/2.6.29.6-aldebaran-rt/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 <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
  34 static 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
  41 static 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
  52 static void mst_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  53 {
  54         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  55 }
  56
  57 static unsigned long mst_pcmcia_status[2];
  58
  59 static 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
  91 static 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
 132 static void mst_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 133 {
 134 }
 135
 136 static void mst_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 137 {
 138 }
 139
 140 static 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
 151 static struct platform_device *mst_pcmcia_device;
 152
 153 static 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
 175 static void __exit mst_pcmcia_exit(void)
 176 {
 177         platform_device_unregister(mst_pcmcia_device);
 178 }
 179
 180 fs_initcall(mst_pcmcia_init);
 181 module_exit(mst_pcmcia_exit);
 182
 183 MODULE_LICENSE("GPL");
 184 MODULE_ALIAS("platform:pxa2xx-pcmcia");