drivers/pcmcia/sa1111_lubbock.c

   1 /*
   2  * linux/drivers/pcmcia/pxa2xx_lubbock.c
   3  *
   4  * Author:      George Davis
   5  * Created:     Jan 10, 2002
   6  * Copyright:   MontaVista Software Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
  13  *
  14  * Lubbock PCMCIA specific routines.
  15  *
  16  */
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/device.h>
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/delay.h>
  23
  24 #include <mach/hardware.h>
  25 #include <asm/hardware/sa1111.h>
  26 #include <asm/mach-types.h>
  27
  28 #include "sa1111_generic.h"
  29 #include "max1600.h"
  30
  31 static int lubbock_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  32 {
  33         struct max1600 *m;
  34         int ret;
  35
  36         ret = max1600_init(skt->socket.dev.parent, &m,
  37                            skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
  38                            MAX1600_CODE_HIGH);
  39         if (ret == 0)
  40                 skt->driver_data = m;
  41
  42         return ret;
  43 }
  44
  45 static int
  46 lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  47                                 const socket_state_t *state)
  48 {
  49         struct max1600 *m = skt->driver_data;
  50         int ret = 0;
  51
  52         /* Lubbock uses the Maxim MAX1602, with the following connections:
  53          *
  54          * Socket 0 (PCMCIA):
  55          *      MAX1602 Lubbock         Register
  56          *      Pin     Signal
  57          *      -----   -------         ----------------------
  58          *      A0VPP   S0_PWR0         SA-1111 GPIO A<0>
  59          *      A1VPP   S0_PWR1         SA-1111 GPIO A<1>
  60          *      A0VCC   S0_PWR2         SA-1111 GPIO A<2>
  61          *      A1VCC   S0_PWR3         SA-1111 GPIO A<3>
  62          *      VX      VCC
  63          *      VY      +3.3V
  64          *      12IN    +12V
  65          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  66          *
  67          * Socket 1 (CF):
  68          *      MAX1602 Lubbock         Register
  69          *      Pin     Signal
  70          *      -----   -------         ----------------------
  71          *      A0VPP   GND             VPP is not connected
  72          *      A1VPP   GND             VPP is not connected
  73          *      A0VCC   S1_PWR0         MISC_WR<14>
  74          *      A1VCC   S1_PWR1         MISC_WR<15>
  75          *      VX      VCC
  76          *      VY      +3.3V
  77          *      12IN    GND             VPP is not connected
  78          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  79          *
  80          */
  81
  82  again:
  83         switch (skt->nr) {
  84         case 0:
  85         case 1:
  86                 break;
  87
  88         default:
  89                 ret = -1;
  90         }
  91
  92         if (ret == 0)
  93                 ret = sa1111_pcmcia_configure_socket(skt, state);
  94         if (ret == 0)
  95                 ret = max1600_configure(m, state->Vcc, state->Vpp);
  96
  97 #if 1
  98         if (ret == 0 && state->Vcc == 33) {
  99                 struct pcmcia_state new_state;
 100
 101                 /*
 102                  * HACK ALERT:
 103                  * We can't sense the voltage properly on Lubbock before
 104                  * actually applying some power to the socket (catch 22).
 105                  * Resense the socket Voltage Sense pins after applying
 106                  * socket power.
 107                  *
 108                  * Note: It takes about 2.5ms for the MAX1602 VCC output
 109                  * to rise.
 110                  */
 111                 mdelay(3);
 112
 113                 sa1111_pcmcia_socket_state(skt, &new_state);
 114
 115                 if (!new_state.vs_3v && !new_state.vs_Xv) {
 116                         /*
 117                          * Switch to 5V,  Configure socket with 5V voltage
 118                          */
 119                         max1600_configure(m, 0, 0);
 120
 121                         /*
 122                          * It takes about 100ms to turn off Vcc.
 123                          */
 124                         mdelay(100);
 125
 126                         /*
 127                          * We need to hack around the const qualifier as
 128                          * well to keep this ugly workaround localized and
 129                          * not force it to the rest of the code. Barf bags
 130                          * available in the seat pocket in front of you!
 131                          */
 132                         ((socket_state_t *)state)->Vcc = 50;
 133                         ((socket_state_t *)state)->Vpp = 50;
 134                         goto again;
 135                 }
 136         }
 137 #endif
 138
 139         return ret;
 140 }
 141
 142 static struct pcmcia_low_level lubbock_pcmcia_ops = {
 143         .owner                  = THIS_MODULE,
 144         .hw_init                = lubbock_pcmcia_hw_init,
 145         .configure_socket       = lubbock_pcmcia_configure_socket,
 146         .first                  = 0,
 147         .nr                     = 2,
 148 };
 149
 150 #include "pxa2xx_base.h"
 151
 152 int pcmcia_lubbock_init(struct sa1111_dev *sadev)
 153 {
 154         pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
 155         pxa2xx_configure_sockets(&sadev->dev, &lubbock_pcmcia_ops);
 156         return sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
 157                                  pxa2xx_drv_pcmcia_add_one);
 158 }
 159
 160 MODULE_LICENSE("GPL");