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 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
  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
  51 static void mst_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  52 {
  53         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  54 }
  55
  56 static unsigned long mst_pcmcia_status[2];
  57
  58 static 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
  90 static 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
 131 static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
 132         .owner                  = THIS_MODULE,
 133         .hw_init                = mst_pcmcia_hw_init,
 134         .hw_shutdown            = mst_pcmcia_hw_shutdown,
 135         .socket_state           = mst_pcmcia_socket_state,
 136         .configure_socket       = mst_pcmcia_configure_socket,
 137         .nr                     = 2,
 138 };
 139
 140 static struct platform_device *mst_pcmcia_device;
 141
 142 static int __init mst_pcmcia_init(void)
 143 {
 144         int ret;
 145
 146         if (!machine_is_mainstone())
 147                 return -ENODEV;
 148
 149         mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 150         if (!mst_pcmcia_device)
 151                 return -ENOMEM;
 152
 153         ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
 154                                        sizeof(mst_pcmcia_ops));
 155         if (ret == 0)
 156                 ret = platform_device_add(mst_pcmcia_device);
 157
 158         if (ret)
 159                 platform_device_put(mst_pcmcia_device);
 160
 161         return ret;
 162 }
 163
 164 static void __exit mst_pcmcia_exit(void)
 165 {
 166         platform_device_unregister(mst_pcmcia_device);
 167 }
 168
 169 fs_initcall(mst_pcmcia_init);
 170 module_exit(mst_pcmcia_exit);
 171
 172 MODULE_LICENSE("GPL");
 173 MODULE_ALIAS("platform:pxa2xx-pcmcia");