drivers/pcmcia/sa1111_neponset.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/drivers/pcmcia/sa1100_neponset.c
   4  *
   5  * Neponset PCMCIA specific routines
   6  */
   7 #include <linux/module.h>
   8 #include <linux/kernel.h>
   9 #include <linux/device.h>
  10 #include <linux/errno.h>
  11 #include <linux/init.h>
  12
  13 #include <mach/hardware.h>
  14 #include <asm/mach-types.h>
  15 #include <mach/neponset.h>
  16 #include <asm/hardware/sa1111.h>
  17
  18 #include "sa1111_generic.h"
  19
  20 /*
  21  * Neponset uses the Maxim MAX1600, with the following connections:
  22  *
  23  *   MAX1600      Neponset
  24  *
  25  *    A0VCC        SA-1111 GPIO A<1>
  26  *    A1VCC        SA-1111 GPIO A<0>
  27  *    A0VPP        CPLD NCR A0VPP
  28  *    A1VPP        CPLD NCR A1VPP
  29  *    B0VCC        SA-1111 GPIO A<2>
  30  *    B1VCC        SA-1111 GPIO A<3>
  31  *    B0VPP        ground (slot B is CF)
  32  *    B1VPP        ground (slot B is CF)
  33  *
  34  *     VX          VCC (5V)
  35  *     VY          VCC3_3 (3.3V)
  36  *     12INA       12V
  37  *     12INB       ground (slot B is CF)
  38  *
  39  * The MAX1600 CODE pin is tied to ground, placing the device in
  40  * "Standard Intel code" mode. Refer to the Maxim data sheet for
  41  * the corresponding truth table.
  42  */
  43
  44 static int
  45 neponset_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
  46 {
  47         struct sa1111_pcmcia_socket *s = to_skt(skt);
  48         unsigned int ncr_mask, ncr_set, pa_dwr_mask, pa_dwr_set;
  49         int ret;
  50
  51         switch (skt->nr) {
  52         case 0:
  53                 pa_dwr_mask = GPIO_A0 | GPIO_A1;
  54                 ncr_mask = NCR_A0VPP | NCR_A1VPP;
  55
  56                 if (state->Vpp == 0)
  57                         ncr_set = 0;
  58                 else if (state->Vpp == 120)
  59                         ncr_set = NCR_A1VPP;
  60                 else if (state->Vpp == state->Vcc)
  61                         ncr_set = NCR_A0VPP;
  62                 else {
  63                         printk(KERN_ERR "%s(): unrecognized VPP %u\n",
  64                                __func__, state->Vpp);
  65                         return -1;
  66                 }
  67                 break;
  68
  69         case 1:
  70                 pa_dwr_mask = GPIO_A2 | GPIO_A3;
  71                 ncr_mask = 0;
  72                 ncr_set = 0;
  73
  74                 if (state->Vpp != state->Vcc && state->Vpp != 0) {
  75                         printk(KERN_ERR "%s(): CF slot cannot support VPP %u\n",
  76                                __func__, state->Vpp);
  77                         return -1;
  78                 }
  79                 break;
  80
  81         default:
  82                 return -1;
  83         }
  84
  85         /*
  86          * pa_dwr_set is the mask for selecting Vcc on both sockets.
  87          * pa_dwr_mask selects which bits (and therefore socket) we change.
  88          */
  89         switch (state->Vcc) {
  90         default:
  91         case 0:  pa_dwr_set = 0;                break;
  92         case 33: pa_dwr_set = GPIO_A1|GPIO_A2;  break;
  93         case 50: pa_dwr_set = GPIO_A0|GPIO_A3;  break;
  94         }
  95
  96         ret = sa1111_pcmcia_configure_socket(skt, state);
  97         if (ret == 0) {
  98                 neponset_ncr_frob(ncr_mask, ncr_set);
  99                 sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
 100         }
 101
 102         return ret;
 103 }
 104
 105 static struct pcmcia_low_level neponset_pcmcia_ops = {
 106         .owner                  = THIS_MODULE,
 107         .configure_socket       = neponset_pcmcia_configure_socket,
 108         .first                  = 0,
 109         .nr                     = 2,
 110 };
 111
 112 int pcmcia_neponset_init(struct sa1111_dev *sadev)
 113 {
 114         /*
 115          * Set GPIO_A<3:0> to be outputs for the MAX1600,
 116          * and switch to standby mode.
 117          */
 118         sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
 119         sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 120         sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
 121         sa11xx_drv_pcmcia_ops(&neponset_pcmcia_ops);
 122         return sa1111_pcmcia_add(sadev, &neponset_pcmcia_ops,
 123                                  sa11xx_drv_pcmcia_add_one);
 124 }