linux/drivers/pcmcia/sa1100_neponset.c
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   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        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
 108static 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
 116static 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
 126int __init 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}
 143