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         unsigned int ncr_mask, ncr_set, pa_dwr_mask, pa_dwr_set;
  47         int ret;
  48
  49         switch (skt->nr) {
  50         case 0:
  51                 pa_dwr_mask = GPIO_A0 | GPIO_A1;
  52                 ncr_mask = NCR_A0VPP | NCR_A1VPP;
  53
  54                 if (state->Vpp == 0)
  55                         ncr_set = 0;
  56                 else if (state->Vpp == 120)
  57                         ncr_set = NCR_A1VPP;
  58                 else if (state->Vpp == state->Vcc)
  59                         ncr_set = NCR_A0VPP;
  60                 else {
  61                         printk(KERN_ERR "%s(): unrecognized VPP %u\n",
  62                                __func__, state->Vpp);
  63                         return -1;
  64                 }
  65                 break;
  66
  67         case 1:
  68                 pa_dwr_mask = GPIO_A2 | GPIO_A3;
  69                 ncr_mask = 0;
  70                 ncr_set = 0;
  71
  72                 if (state->Vpp != state->Vcc && state->Vpp != 0) {
  73                         printk(KERN_ERR "%s(): CF slot cannot support VPP %u\n",
  74                                __func__, state->Vpp);
  75                         return -1;
  76                 }
  77                 break;
  78
  79         default:
  80                 return -1;
  81         }
  82
  83         /*
  84          * pa_dwr_set is the mask for selecting Vcc on both sockets.
  85          * pa_dwr_mask selects which bits (and therefore socket) we change.
  86          */
  87         switch (state->Vcc) {
  88         default:
  89         case 0:  pa_dwr_set = 0;                break;
  90         case 33: pa_dwr_set = GPIO_A1|GPIO_A2;  break;
  91         case 50: pa_dwr_set = GPIO_A0|GPIO_A3;  break;
  92         }
  93
  94         ret = sa1111_pcmcia_configure_socket(skt, state);
  95         if (ret == 0) {
  96                 unsigned long flags;
  97
  98                 local_irq_save(flags);
  99                 NCR_0 = (NCR_0 & ~ncr_mask) | ncr_set;
 100
 101                 local_irq_restore(flags);
 102                 sa1111_set_io(SA1111_DEV(skt->dev), pa_dwr_mask, pa_dwr_set);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static void neponset_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 109 {
 110         if (skt->nr == 0)
 111                 NCR_0 &= ~(NCR_A0VPP | NCR_A1VPP);
 112
 113         sa1111_pcmcia_socket_init(skt);
 114 }
 115
 116 static struct pcmcia_low_level neponset_pcmcia_ops = {
 117         .owner                  = THIS_MODULE,
 118         .hw_init                = sa1111_pcmcia_hw_init,
 119         .hw_shutdown            = sa1111_pcmcia_hw_shutdown,
 120         .socket_state           = sa1111_pcmcia_socket_state,
 121         .configure_socket       = neponset_pcmcia_configure_socket,
 122         .socket_init            = neponset_pcmcia_socket_init,
 123         .socket_suspend         = sa1111_pcmcia_socket_suspend,
 124 };
 125
 126 int pcmcia_neponset_init(struct sa1111_dev *sadev)
 127 {
 128         int ret = -ENODEV;
 129
 130         if (machine_is_assabet()) {
 131                 /*
 132                  * Set GPIO_A<3:0> to be outputs for the MAX1600,
 133                  * and switch to standby mode.
 134                  */
 135                 sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
 136                 sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 137                 sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 138                 ret = sa11xx_drv_pcmcia_probe(&sadev->dev, &neponset_pcmcia_ops, 0, 2);
 139         }
 140
 141         return ret;
 142 }