release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/pcmcia/pxa2xx_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 #include <mach/lubbock.h>
  28
  29 #include "sa1111_generic.h"
  30
  31 static int
  32 lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  33                                 const socket_state_t *state)
  34 {
  35         struct sa1111_pcmcia_socket *s = to_skt(skt);
  36         unsigned int pa_dwr_mask, pa_dwr_set, misc_mask, misc_set;
  37         int ret = 0;
  38
  39         pa_dwr_mask = pa_dwr_set = misc_mask = misc_set = 0;
  40
  41         /* Lubbock uses the Maxim MAX1602, with the following connections:
  42          *
  43          * Socket 0 (PCMCIA):
  44          *      MAX1602 Lubbock         Register
  45          *      Pin     Signal
  46          *      -----   -------         ----------------------
  47          *      A0VPP   S0_PWR0         SA-1111 GPIO A<0>
  48          *      A1VPP   S0_PWR1         SA-1111 GPIO A<1>
  49          *      A0VCC   S0_PWR2         SA-1111 GPIO A<2>
  50          *      A1VCC   S0_PWR3         SA-1111 GPIO A<3>
  51          *      VX      VCC
  52          *      VY      +3.3V
  53          *      12IN    +12V
  54          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  55          *
  56          * Socket 1 (CF):
  57          *      MAX1602 Lubbock         Register
  58          *      Pin     Signal
  59          *      -----   -------         ----------------------
  60          *      A0VPP   GND             VPP is not connected
  61          *      A1VPP   GND             VPP is not connected
  62          *      A0VCC   S1_PWR0         MISC_WR<14>
  63          *      A1VCC   S1_PWR1         MISC_WR<15>
  64          *      VX      VCC
  65          *      VY      +3.3V
  66          *      12IN    GND             VPP is not connected
  67          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  68          *
  69          */
  70
  71  again:
  72         switch (skt->nr) {
  73         case 0:
  74                 pa_dwr_mask = GPIO_A0 | GPIO_A1 | GPIO_A2 | GPIO_A3;
  75
  76                 switch (state->Vcc) {
  77                 case 0: /* Hi-Z */
  78                         break;
  79
  80                 case 33: /* VY */
  81                         pa_dwr_set |= GPIO_A3;
  82                         break;
  83
  84                 case 50: /* VX */
  85                         pa_dwr_set |= GPIO_A2;
  86                         break;
  87
  88                 default:
  89                         printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
  90                                __func__, state->Vcc);
  91                         ret = -1;
  92                 }
  93
  94                 switch (state->Vpp) {
  95                 case 0: /* Hi-Z */
  96                         break;
  97
  98                 case 120: /* 12IN */
  99                         pa_dwr_set |= GPIO_A1;
 100                         break;
 101
 102                 default: /* VCC */
 103                         if (state->Vpp == state->Vcc)
 104                                 pa_dwr_set |= GPIO_A0;
 105                         else {
 106                                 printk(KERN_ERR "%s(): unrecognized Vpp %u\n",
 107                                        __func__, state->Vpp);
 108                                 ret = -1;
 109                                 break;
 110                         }
 111                 }
 112                 break;
 113
 114         case 1:
 115                 misc_mask = (1 << 15) | (1 << 14);
 116
 117                 switch (state->Vcc) {
 118                 case 0: /* Hi-Z */
 119                         break;
 120
 121                 case 33: /* VY */
 122                         misc_set |= 1 << 15;
 123                         break;
 124
 125                 case 50: /* VX */
 126                         misc_set |= 1 << 14;
 127                         break;
 128
 129                 default:
 130                         printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
 131                                __func__, state->Vcc);
 132                         ret = -1;
 133                         break;
 134                 }
 135
 136                 if (state->Vpp != state->Vcc && state->Vpp != 0) {
 137                         printk(KERN_ERR "%s(): CF slot cannot support Vpp %u\n",
 138                                __func__, state->Vpp);
 139                         ret = -1;
 140                         break;
 141                 }
 142                 break;
 143
 144         default:
 145                 ret = -1;
 146         }
 147
 148         if (ret == 0)
 149                 ret = sa1111_pcmcia_configure_socket(skt, state);
 150
 151         if (ret == 0) {
 152                 lubbock_set_misc_wr(misc_mask, misc_set);
 153                 sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
 154         }
 155
 156         if (ret == 0 && state->Vcc == 33) {
 157                 struct pcmcia_state new_state;
 158
 159                 /*
 160                  * HACK ALERT:
 161                  * We can't sense the voltage properly on Lubbock before
 162                  * actually applying some power to the socket (catch 22).
 163                  * Resense the socket Voltage Sense pins after applying
 164                  * socket power.
 165                  *
 166                  * Note: It takes about 2.5ms for the MAX1602 VCC output
 167                  * to rise.
 168                  */
 169                 mdelay(3);
 170
 171                 sa1111_pcmcia_socket_state(skt, &new_state);
 172
 173                 if (!new_state.vs_3v && !new_state.vs_Xv) {
 174                         /*
 175                          * Switch to 5V,  Configure socket with 5V voltage
 176                          */
 177                         lubbock_set_misc_wr(misc_mask, 0);
 178                         sa1111_set_io(s->dev, pa_dwr_mask, 0);
 179
 180                         /*
 181                          * It takes about 100ms to turn off Vcc.
 182                          */
 183                         mdelay(100);
 184
 185                         ((socket_state_t *)state)->Vcc = 50;
 186                         ((socket_state_t *)state)->Vpp = 50;
 187                         goto again;
 188                 }
 189         }
 190
 191         return ret;
 192 }
 193
 194 static struct pcmcia_low_level lubbock_pcmcia_ops = {
 195         .owner                  = THIS_MODULE,
 196         .configure_socket       = lubbock_pcmcia_configure_socket,
 197         .socket_init            = sa1111_pcmcia_socket_init,
 198         .first                  = 0,
 199         .nr                     = 2,
 200 };
 201
 202 #include "pxa2xx_base.h"
 203
 204 int pcmcia_lubbock_init(struct sa1111_dev *sadev)
 205 {
 206         int ret = -ENODEV;
 207
 208         if (machine_is_lubbock()) {
 209                 /*
 210                  * Set GPIO_A<3:0> to be outputs for the MAX1600,
 211                  * and switch to standby mode.
 212                  */
 213                 sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
 214                 sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 215                 sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 216
 217                 /* Set CF Socket 1 power to standby mode. */
 218                 lubbock_set_misc_wr((1 << 15) | (1 << 14), 0);
 219
 220                 pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
 221                 ret = sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
 222                                 pxa2xx_drv_pcmcia_add_one);
 223         }
 224
 225         return ret;
 226 }
 227
 228 MODULE_LICENSE("GPL");