drivers/pcmcia/sa1100_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                 unsigned long flags;
  98
  99                 local_irq_save(flags);
 100                 NCR_0 = (NCR_0 & ~ncr_mask) | ncr_set;
 101
 102                 local_irq_restore(flags);
 103                 sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
 104         }
 105
 106         return 0;
 107 }
 108
 109 static void neponset_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 110 {
 111         if (skt->nr == 0)
 112                 NCR_0 &= ~(NCR_A0VPP | NCR_A1VPP);
 113
 114         sa1111_pcmcia_socket_init(skt);
 115 }
 116
 117 static struct pcmcia_low_level neponset_pcmcia_ops = {
 118         .owner                  = THIS_MODULE,
 119         .configure_socket       = neponset_pcmcia_configure_socket,
 120         .socket_init            = neponset_pcmcia_socket_init,
 121         .first                  = 0,
 122         .nr                     = 2,
 123 };
 124
 125 int pcmcia_neponset_init(struct sa1111_dev *sadev)
 126 {
 127         int ret = -ENODEV;
 128
 129         if (machine_is_assabet()) {
 130                 /*
 131                  * Set GPIO_A<3:0> to be outputs for the MAX1600,
 132                  * and switch to standby mode.
 133                  */
 134                 sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
 135                 sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 136                 sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 137                 sa11xx_drv_pcmcia_ops(&neponset_pcmcia_ops);
 138                 ret = sa1111_pcmcia_add(sadev, &neponset_pcmcia_ops,
 139                                 sa11xx_drv_pcmcia_add_one);
 140         }
 141
 142         return ret;
 143 }