drivers/pcmcia/sa1111_lubbock.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/pcmcia/pxa2xx_lubbock.c
   4  *
   5  * Author:      George Davis
   6  * Created:     Jan 10, 2002
   7  * Copyright:   MontaVista Software Inc.
   8  *
   9  * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
  10  *
  11  * Lubbock PCMCIA specific routines.
  12  */
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/device.h>
  16 #include <linux/errno.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19
  20 #include <mach/hardware.h>
  21 #include <asm/hardware/sa1111.h>
  22 #include <asm/mach-types.h>
  23
  24 #include "sa1111_generic.h"
  25 #include "max1600.h"
  26
  27 static int lubbock_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  28 {
  29         struct max1600 *m;
  30         int ret;
  31
  32         ret = max1600_init(skt->socket.dev.parent, &m,
  33                            skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
  34                            MAX1600_CODE_HIGH);
  35         if (ret == 0)
  36                 skt->driver_data = m;
  37
  38         return ret;
  39 }
  40
  41 static int
  42 lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  43                                 const socket_state_t *state)
  44 {
  45         struct max1600 *m = skt->driver_data;
  46         int ret = 0;
  47
  48         /* Lubbock uses the Maxim MAX1602, with the following connections:
  49          *
  50          * Socket 0 (PCMCIA):
  51          *      MAX1602 Lubbock         Register
  52          *      Pin     Signal
  53          *      -----   -------         ----------------------
  54          *      A0VPP   S0_PWR0         SA-1111 GPIO A<0>
  55          *      A1VPP   S0_PWR1         SA-1111 GPIO A<1>
  56          *      A0VCC   S0_PWR2         SA-1111 GPIO A<2>
  57          *      A1VCC   S0_PWR3         SA-1111 GPIO A<3>
  58          *      VX      VCC
  59          *      VY      +3.3V
  60          *      12IN    +12V
  61          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  62          *
  63          * Socket 1 (CF):
  64          *      MAX1602 Lubbock         Register
  65          *      Pin     Signal
  66          *      -----   -------         ----------------------
  67          *      A0VPP   GND             VPP is not connected
  68          *      A1VPP   GND             VPP is not connected
  69          *      A0VCC   S1_PWR0         MISC_WR<14>
  70          *      A1VCC   S1_PWR1         MISC_WR<15>
  71          *      VX      VCC
  72          *      VY      +3.3V
  73          *      12IN    GND             VPP is not connected
  74          *      CODE    +3.3V           Cirrus  Code, CODE = High (VY)
  75          *
  76          */
  77
  78  again:
  79         switch (skt->nr) {
  80         case 0:
  81         case 1:
  82                 break;
  83
  84         default:
  85                 ret = -1;
  86         }
  87
  88         if (ret == 0)
  89                 ret = sa1111_pcmcia_configure_socket(skt, state);
  90         if (ret == 0)
  91                 ret = max1600_configure(m, state->Vcc, state->Vpp);
  92
  93 #if 1
  94         if (ret == 0 && state->Vcc == 33) {
  95                 struct pcmcia_state new_state;
  96
  97                 /*
  98                  * HACK ALERT:
  99                  * We can't sense the voltage properly on Lubbock before
 100                  * actually applying some power to the socket (catch 22).
 101                  * Resense the socket Voltage Sense pins after applying
 102                  * socket power.
 103                  *
 104                  * Note: It takes about 2.5ms for the MAX1602 VCC output
 105                  * to rise.
 106                  */
 107                 mdelay(3);
 108
 109                 sa1111_pcmcia_socket_state(skt, &new_state);
 110
 111                 if (!new_state.vs_3v && !new_state.vs_Xv) {
 112                         /*
 113                          * Switch to 5V,  Configure socket with 5V voltage
 114                          */
 115                         max1600_configure(m, 0, 0);
 116
 117                         /*
 118                          * It takes about 100ms to turn off Vcc.
 119                          */
 120                         mdelay(100);
 121
 122                         /*
 123                          * We need to hack around the const qualifier as
 124                          * well to keep this ugly workaround localized and
 125                          * not force it to the rest of the code. Barf bags
 126                          * available in the seat pocket in front of you!
 127                          */
 128                         ((socket_state_t *)state)->Vcc = 50;
 129                         ((socket_state_t *)state)->Vpp = 50;
 130                         goto again;
 131                 }
 132         }
 133 #endif
 134
 135         return ret;
 136 }
 137
 138 static struct pcmcia_low_level lubbock_pcmcia_ops = {
 139         .owner                  = THIS_MODULE,
 140         .hw_init                = lubbock_pcmcia_hw_init,
 141         .configure_socket       = lubbock_pcmcia_configure_socket,
 142         .first                  = 0,
 143         .nr                     = 2,
 144 };
 145
 146 #include "pxa2xx_base.h"
 147
 148 int pcmcia_lubbock_init(struct sa1111_dev *sadev)
 149 {
 150         pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
 151         pxa2xx_configure_sockets(&sadev->dev, &lubbock_pcmcia_ops);
 152         return sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
 153                                  pxa2xx_drv_pcmcia_add_one);
 154 }
 155
 156 MODULE_LICENSE("GPL");