drivers/pcmcia/sa1111_neponset.c

   1 /*
   2  * linux/drivers/pcmcia/sa1100_neponset.c
   3  *
   4  * Neponset PCMCIA specific routines
   5  */
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/device.h>
   9 #include <linux/errno.h>
  10 #include <linux/init.h>
  11
  12 #include <mach/hardware.h>
  13 #include <asm/mach-types.h>
  14 #include <mach/neponset.h>
  15 #include <asm/hardware/sa1111.h>
  16
  17 #include "sa1111_generic.h"
  18
  19 /*
  20  * Neponset uses the Maxim MAX1600, with the following connections:
  21  *
  22  *   MAX1600      Neponset
  23  *
  24  *    A0VCC        SA-1111 GPIO A<1>
  25  *    A1VCC        SA-1111 GPIO A<0>
  26  *    A0VPP        CPLD NCR A0VPP
  27  *    A1VPP        CPLD NCR A1VPP
  28  *    B0VCC        SA-1111 GPIO A<2>
  29  *    B1VCC        SA-1111 GPIO A<3>
  30  *    B0VPP        ground (slot B is CF)
  31  *    B1VPP        ground (slot B is CF)
  32  *
  33  *     VX          VCC (5V)
  34  *     VY          VCC3_3 (3.3V)
  35  *     12INA       12V
  36  *     12INB       ground (slot B is CF)
  37  *
  38  * The MAX1600 CODE pin is tied to ground, placing the device in
  39  * "Standard Intel code" mode. Refer to the Maxim data sheet for
  40  * the corresponding truth table.
  41  */
  42
  43 static int
  44 neponset_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
  45 {
  46         struct sa1111_pcmcia_socket *s = to_skt(skt);
  47         unsigned int ncr_mask, ncr_set, pa_dwr_mask, pa_dwr_set;
  48         int ret;
  49
  50         switch (skt->nr) {
  51         case 0:
  52                 pa_dwr_mask = GPIO_A0 | GPIO_A1;
  53                 ncr_mask = NCR_A0VPP | NCR_A1VPP;
  54
  55                 if (state->Vpp == 0)
  56                         ncr_set = 0;
  57                 else if (state->Vpp == 120)
  58                         ncr_set = NCR_A1VPP;
  59                 else if (state->Vpp == state->Vcc)
  60                         ncr_set = NCR_A0VPP;
  61                 else {
  62                         printk(KERN_ERR "%s(): unrecognized VPP %u\n",
  63                                __func__, state->Vpp);
  64                         return -1;
  65                 }
  66                 break;
  67
  68         case 1:
  69                 pa_dwr_mask = GPIO_A2 | GPIO_A3;
  70                 ncr_mask = 0;
  71                 ncr_set = 0;
  72
  73                 if (state->Vpp != state->Vcc && state->Vpp != 0) {
  74                         printk(KERN_ERR "%s(): CF slot cannot support VPP %u\n",
  75                                __func__, state->Vpp);
  76                         return -1;
  77                 }
  78                 break;
  79
  80         default:
  81                 return -1;
  82         }
  83
  84         /*
  85          * pa_dwr_set is the mask for selecting Vcc on both sockets.
  86          * pa_dwr_mask selects which bits (and therefore socket) we change.
  87          */
  88         switch (state->Vcc) {
  89         default:
  90         case 0:  pa_dwr_set = 0;                break;
  91         case 33: pa_dwr_set = GPIO_A1|GPIO_A2;  break;
  92         case 50: pa_dwr_set = GPIO_A0|GPIO_A3;  break;
  93         }
  94
  95         ret = sa1111_pcmcia_configure_socket(skt, state);
  96         if (ret == 0) {
  97                 neponset_ncr_frob(ncr_mask, ncr_set);
  98                 sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
  99         }
 100
 101         return ret;
 102 }
 103
 104 static struct pcmcia_low_level neponset_pcmcia_ops = {
 105         .owner                  = THIS_MODULE,
 106         .configure_socket       = neponset_pcmcia_configure_socket,
 107         .first                  = 0,
 108         .nr                     = 2,
 109 };
 110
 111 int pcmcia_neponset_init(struct sa1111_dev *sadev)
 112 {
 113         /*
 114          * Set GPIO_A<3:0> to be outputs for the MAX1600,
 115          * and switch to standby mode.
 116          */
 117         sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
 118         sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 119         sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 120         sa11xx_drv_pcmcia_ops(&neponset_pcmcia_ops);
 121         return sa1111_pcmcia_add(sadev, &neponset_pcmcia_ops,
 122                                  sa11xx_drv_pcmcia_add_one);
 123 }