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/device.h>
  21
  22 #include <pcmcia/ss.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/irq.h>
  26
  27 #include <asm/arch/pxa-regs.h>
  28 #include <asm/arch/mainstone.h>
  29
  30 #include "soc_common.h"
  31
  32
  33 static 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
  40 static 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         GPSR(GPIO48_nPOE) =
  47                 GPIO_bit(GPIO48_nPOE) |
  48                 GPIO_bit(GPIO49_nPWE) |
  49                 GPIO_bit(GPIO50_nPIOR) |
  50                 GPIO_bit(GPIO51_nPIOW) |
  51                 GPIO_bit(GPIO85_nPCE_1) |
  52                 GPIO_bit(GPIO54_nPCE_2);
  53
  54         pxa_gpio_mode(GPIO48_nPOE_MD);
  55         pxa_gpio_mode(GPIO49_nPWE_MD);
  56         pxa_gpio_mode(GPIO50_nPIOR_MD);
  57         pxa_gpio_mode(GPIO51_nPIOW_MD);
  58         pxa_gpio_mode(GPIO85_nPCE_1_MD);
  59         pxa_gpio_mode(GPIO54_nPCE_2_MD);
  60         pxa_gpio_mode(GPIO79_pSKTSEL_MD);
  61         pxa_gpio_mode(GPIO55_nPREG_MD);
  62         pxa_gpio_mode(GPIO56_nPWAIT_MD);
  63         pxa_gpio_mode(GPIO57_nIOIS16_MD);
  64
  65         skt->irq = (skt->nr == 0) ? MAINSTONE_S0_IRQ : MAINSTONE_S1_IRQ;
  66         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  67 }
  68
  69 static void mst_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  70 {
  71         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  72 }
  73
  74 static unsigned long mst_pcmcia_status[2];
  75
  76 static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  77                                     struct pcmcia_state *state)
  78 {
  79         unsigned long status, flip;
  80
  81         status = (skt->nr == 0) ? MST_PCMCIA0 : MST_PCMCIA1;
  82         flip = (status ^ mst_pcmcia_status[skt->nr]) & MST_PCMCIA_nSTSCHG_BVD1;
  83
  84         /*
  85          * Workaround for STSCHG which can't be deasserted:
  86          * We therefore disable/enable corresponding IRQs
  87          * as needed to avoid IRQ locks.
  88          */
  89         if (flip) {
  90                 mst_pcmcia_status[skt->nr] = status;
  91                 if (status & MST_PCMCIA_nSTSCHG_BVD1)
  92                         enable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
  93                                                    : MAINSTONE_S1_STSCHG_IRQ );
  94                 else
  95                         disable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
  96                                                     : MAINSTONE_S1_STSCHG_IRQ );
  97         }
  98
  99         state->detect = (status & MST_PCMCIA_nCD) ? 0 : 1;
 100         state->ready  = (status & MST_PCMCIA_nIRQ) ? 1 : 0;
 101         state->bvd1   = (status & MST_PCMCIA_nSTSCHG_BVD1) ? 1 : 0;
 102         state->bvd2   = (status & MST_PCMCIA_nSPKR_BVD2) ? 1 : 0;
 103         state->vs_3v  = (status & MST_PCMCIA_nVS1) ? 0 : 1;
 104         state->vs_Xv  = (status & MST_PCMCIA_nVS2) ? 0 : 1;
 105         state->wrprot = 0;  /* not available */
 106 }
 107
 108 static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 109                                        const socket_state_t *state)
 110 {
 111         unsigned long power = 0;
 112         int ret = 0;
 113
 114         switch (state->Vcc) {
 115         case 0:  power |= MST_PCMCIA_PWR_VCC_0;  break;
 116         case 33: power |= MST_PCMCIA_PWR_VCC_33; break;
 117         case 50: power |= MST_PCMCIA_PWR_VCC_50; break;
 118         default:
 119                  printk(KERN_ERR "%s(): bad Vcc %u\n",
 120                                  __FUNCTION__, state->Vcc);
 121                  ret = -1;
 122         }
 123
 124         switch (state->Vpp) {
 125         case 0:   power |= MST_PCMCIA_PWR_VPP_0;   break;
 126         case 120: power |= MST_PCMCIA_PWR_VPP_120; break;
 127         default:
 128                   if(state->Vpp == state->Vcc) {
 129                           power |= MST_PCMCIA_PWR_VPP_VCC;
 130                   } else {
 131                           printk(KERN_ERR "%s(): bad Vpp %u\n",
 132                                           __FUNCTION__, state->Vpp);
 133                           ret = -1;
 134                   }
 135         }
 136
 137         if (state->flags & SS_RESET)
 138                power |= MST_PCMCIA_RESET;
 139
 140         switch (skt->nr) {
 141         case 0:  MST_PCMCIA0 = power; break;
 142         case 1:  MST_PCMCIA1 = power; break;
 143         default: ret = -1;
 144         }
 145
 146         return ret;
 147 }
 148
 149 static void mst_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 150 {
 151 }
 152
 153 static void mst_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 154 {
 155 }
 156
 157 static struct pcmcia_low_level mst_pcmcia_ops = {
 158         .owner                  = THIS_MODULE,
 159         .hw_init                = mst_pcmcia_hw_init,
 160         .hw_shutdown            = mst_pcmcia_hw_shutdown,
 161         .socket_state           = mst_pcmcia_socket_state,
 162         .configure_socket       = mst_pcmcia_configure_socket,
 163         .socket_init            = mst_pcmcia_socket_init,
 164         .socket_suspend         = mst_pcmcia_socket_suspend,
 165         .nr                     = 2,
 166 };
 167
 168 static struct platform_device *mst_pcmcia_device;
 169
 170 static int __init mst_pcmcia_init(void)
 171 {
 172         int ret;
 173
 174         mst_pcmcia_device = kmalloc(sizeof(*mst_pcmcia_device), GFP_KERNEL);
 175         if (!mst_pcmcia_device)
 176                 return -ENOMEM;
 177         memset(mst_pcmcia_device, 0, sizeof(*mst_pcmcia_device));
 178         mst_pcmcia_device->name = "pxa2xx-pcmcia";
 179         mst_pcmcia_device->dev.platform_data = &mst_pcmcia_ops;
 180
 181         ret = platform_device_register(mst_pcmcia_device);
 182         if (ret)
 183                 kfree(mst_pcmcia_device);
 184
 185         return ret;
 186 }
 187
 188 static void __exit mst_pcmcia_exit(void)
 189 {
 190         /*
 191          * This call is supposed to free our mst_pcmcia_device.
 192          * Unfortunately platform_device don't have a free method, and
 193          * we can't assume it's free of any reference at this point so we
 194          * can't free it either.
 195          */
 196         platform_device_unregister(mst_pcmcia_device);
 197 }
 198
 199 module_init(mst_pcmcia_init);
 200 module_exit(mst_pcmcia_exit);
 201
 202 MODULE_LICENSE("GPL");