LXR linux/drivers/pcmcia/sa1100

   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
  43static int
  44neponset_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
 109static 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
 117static 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
 125int 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}
 144