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         unsigned int pa_dwr_mask, pa_dwr_set, misc_mask, misc_set;
  36         int ret = 0;
  37
  38         pa_dwr_mask = pa_dwr_set = misc_mask = misc_set = 0;
  39
  40         /* Lubbock uses the Maxim MAX1602, with the following connections:
  41          *
  42          * Socket 0 (PCMCIA):
  43          *      MAX1602 Lubbock         Register
  44          *      Pin     Signal
  45          *      -----   -------         ----------------------
  46          *      A0VPP   S0_PWR0         SA-1111 GPIO A<0>
  47          *      A1VPP   S0_PWR1         SA-1111 GPIO A<1>
  48          *      A0VCC   S0_PWR2         SA-1111 GPIO A<2>
  49          *      A1VCC   S0_PWR3         SA-1111 GPIO A<3>
  50          *      VX      VCC
  51          *      VY      +3.3V
  52          *      12IN    +12V
  53          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  54          *
  55          * Socket 1 (CF):
  56          *      MAX1602 Lubbock         Register
  57          *      Pin     Signal
  58          *      -----   -------         ----------------------
  59          *      A0VPP   GND             VPP is not connected
  60          *      A1VPP   GND             VPP is not connected
  61          *      A0VCC   S1_PWR0         MISC_WR<14>
  62          *      A1VCC   S1_PWR1         MISC_WR<15>
  63          *      VX      VCC
  64          *      VY      +3.3V
  65          *      12IN    GND             VPP is not connected
  66          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  67          *
  68          */
  69
  70  again:
  71         switch (skt->nr) {
  72         case 0:
  73                 pa_dwr_mask = GPIO_A0 | GPIO_A1 | GPIO_A2 | GPIO_A3;
  74
  75                 switch (state->Vcc) {
  76                 case 0: /* Hi-Z */
  77                         break;
  78
  79                 case 33: /* VY */
  80                         pa_dwr_set |= GPIO_A3;
  81                         break;
  82
  83                 case 50: /* VX */
  84                         pa_dwr_set |= GPIO_A2;
  85                         break;
  86
  87                 default:
  88                         printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
  89                                __func__, state->Vcc);
  90                         ret = -1;
  91                 }
  92
  93                 switch (state->Vpp) {
  94                 case 0: /* Hi-Z */
  95                         break;
  96
  97                 case 120: /* 12IN */
  98                         pa_dwr_set |= GPIO_A1;
  99                         break;
 100
 101                 default: /* VCC */
 102                         if (state->Vpp == state->Vcc)
 103                                 pa_dwr_set |= GPIO_A0;
 104                         else {
 105                                 printk(KERN_ERR "%s(): unrecognized Vpp %u\n",
 106                                        __func__, state->Vpp);
 107                                 ret = -1;
 108                                 break;
 109                         }
 110                 }
 111                 break;
 112
 113         case 1:
 114                 misc_mask = (1 << 15) | (1 << 14);
 115
 116                 switch (state->Vcc) {
 117                 case 0: /* Hi-Z */
 118                         break;
 119
 120                 case 33: /* VY */
 121                         misc_set |= 1 << 15;
 122                         break;
 123
 124                 case 50: /* VX */
 125                         misc_set |= 1 << 14;
 126                         break;
 127
 128                 default:
 129                         printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
 130                                __func__, state->Vcc);
 131                         ret = -1;
 132                         break;
 133                 }
 134
 135                 if (state->Vpp != state->Vcc && state->Vpp != 0) {
 136                         printk(KERN_ERR "%s(): CF slot cannot support Vpp %u\n",
 137                                __func__, state->Vpp);
 138                         ret = -1;
 139                         break;
 140                 }
 141                 break;
 142
 143         default:
 144                 ret = -1;
 145         }
 146
 147         if (ret == 0)
 148                 ret = sa1111_pcmcia_configure_socket(skt, state);
 149
 150         if (ret == 0) {
 151                 lubbock_set_misc_wr(misc_mask, misc_set);
 152                 sa1111_set_io(SA1111_DEV(skt->dev), pa_dwr_mask, pa_dwr_set);
 153         }
 154
 155 #if 1
 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(SA1111_DEV(skt->dev), pa_dwr_mask, 0);
 179
 180                         /*
 181                          * It takes about 100ms to turn off Vcc.
 182                          */
 183                         mdelay(100);
 184
 185                         /*
 186                          * We need to hack around the const qualifier as
 187                          * well to keep this ugly workaround localized and
 188                          * not force it to the rest of the code. Barf bags
 189                          * avaliable in the seat pocket in front of you!
 190                          */
 191                         ((socket_state_t *)state)->Vcc = 50;
 192                         ((socket_state_t *)state)->Vpp = 50;
 193                         goto again;
 194                 }
 195         }
 196 #endif
 197
 198         return ret;
 199 }
 200
 201 static struct pcmcia_low_level lubbock_pcmcia_ops = {
 202         .owner                  = THIS_MODULE,
 203         .hw_init                = sa1111_pcmcia_hw_init,
 204         .hw_shutdown            = sa1111_pcmcia_hw_shutdown,
 205         .socket_state           = sa1111_pcmcia_socket_state,
 206         .configure_socket       = lubbock_pcmcia_configure_socket,
 207         .socket_init            = sa1111_pcmcia_socket_init,
 208         .socket_suspend         = sa1111_pcmcia_socket_suspend,
 209         .first                  = 0,
 210         .nr                     = 2,
 211 };
 212
 213 #include "pxa2xx_base.h"
 214
 215 int pcmcia_lubbock_init(struct sa1111_dev *sadev)
 216 {
 217         int ret = -ENODEV;
 218
 219         if (machine_is_lubbock()) {
 220                 /*
 221                  * Set GPIO_A<3:0> to be outputs for the MAX1600,
 222                  * and switch to standby mode.
 223                  */
 224                 sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
 225                 sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 226                 sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 227
 228                 /* Set CF Socket 1 power to standby mode. */
 229                 lubbock_set_misc_wr((1 << 15) | (1 << 14), 0);
 230
 231                 sadev->dev.platform_data = &lubbock_pcmcia_ops;
 232                 ret = __pxa2xx_drv_pcmcia_probe(&sadev->dev);
 233         }
 234
 235         return ret;
 236 }
 237
 238 MODULE_LICENSE("GPL");