linux/drivers/pcmcia/sa1100_nanoengine.c
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   1/*
   2 * drivers/pcmcia/sa1100_nanoengine.c
   3 *
   4 * PCMCIA implementation routines for BSI nanoEngine.
   5 *
   6 * In order to have a fully functional pcmcia subsystem in a BSE nanoEngine
   7 * board you should carefully read this:
   8 * http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/
   9 *
  10 * Copyright (C) 2010 Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
  11 *
  12 * Based on original work for kernel 2.4 by
  13 * Miguel Freitas <miguel@cpti.cetuc.puc-rio.br>
  14 *
  15 * This program is free software; you can redistribute it and/or modify
  16 * it under the terms of the GNU General Public License version 2 as
  17 * published by the Free Software Foundation.
  18 *
  19 */
  20#include <linux/device.h>
  21#include <linux/errno.h>
  22#include <linux/gpio.h>
  23#include <linux/interrupt.h>
  24#include <linux/irq.h>
  25#include <linux/init.h>
  26#include <linux/kernel.h>
  27#include <linux/module.h>
  28#include <linux/signal.h>
  29
  30#include <asm/mach-types.h>
  31#include <asm/irq.h>
  32
  33#include <mach/hardware.h>
  34#include <mach/nanoengine.h>
  35
  36#include "sa1100_generic.h"
  37
  38struct nanoengine_pins {
  39        unsigned output_pins;
  40        unsigned clear_outputs;
  41        int gpio_rst;
  42        int gpio_cd;
  43        int gpio_rdy;
  44};
  45
  46static struct nanoengine_pins nano_skts[] = {
  47        {
  48                .gpio_rst               = GPIO_PC_RESET0,
  49                .gpio_cd                = GPIO_PC_CD0,
  50                .gpio_rdy               = GPIO_PC_READY0,
  51        }, {
  52                .gpio_rst               = GPIO_PC_RESET1,
  53                .gpio_cd                = GPIO_PC_CD1,
  54                .gpio_rdy               = GPIO_PC_READY1,
  55        }
  56};
  57
  58unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts);
  59
  60static int nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  61{
  62        unsigned i = skt->nr;
  63        int ret;
  64
  65        if (i >= num_nano_pcmcia_sockets)
  66                return -ENXIO;
  67
  68        ret = gpio_request_one(nano_skts[i].gpio_rst, GPIOF_OUT_INIT_LOW,
  69                i ? "PC RST1" : "PC RST0");
  70        if (ret)
  71                return ret;
  72
  73        skt->stat[SOC_STAT_CD].gpio = nano_skts[i].gpio_cd;
  74        skt->stat[SOC_STAT_CD].name = i ? "PC CD1" : "PC CD0";
  75        skt->stat[SOC_STAT_RDY].gpio = nano_skts[i].gpio_rdy;
  76        skt->stat[SOC_STAT_RDY].name = i ? "PC RDY1" : "PC RDY0";
  77
  78        return 0;
  79}
  80
  81static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  82{
  83        gpio_free(nano_skts[skt->nr].gpio_rst);
  84}
  85
  86static int nanoengine_pcmcia_configure_socket(
  87        struct soc_pcmcia_socket *skt, const socket_state_t *state)
  88{
  89        unsigned i = skt->nr;
  90
  91        if (i >= num_nano_pcmcia_sockets)
  92                return -ENXIO;
  93
  94        gpio_set_value(nano_skts[skt->nr].gpio_rst, !!(state->flags & SS_RESET));
  95
  96        return 0;
  97}
  98
  99static void nanoengine_pcmcia_socket_state(
 100        struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
 101{
 102        unsigned i = skt->nr;
 103
 104        if (i >= num_nano_pcmcia_sockets)
 105                return;
 106
 107        state->bvd1 = 1;
 108        state->bvd2 = 1;
 109        state->vs_3v = 1; /* Can only apply 3.3V */
 110        state->vs_Xv = 0;
 111}
 112
 113static struct pcmcia_low_level nanoengine_pcmcia_ops = {
 114        .owner                  = THIS_MODULE,
 115
 116        .hw_init                = nanoengine_pcmcia_hw_init,
 117        .hw_shutdown            = nanoengine_pcmcia_hw_shutdown,
 118
 119        .configure_socket       = nanoengine_pcmcia_configure_socket,
 120        .socket_state           = nanoengine_pcmcia_socket_state,
 121};
 122
 123int pcmcia_nanoengine_init(struct device *dev)
 124{
 125        int ret = -ENODEV;
 126
 127        if (machine_is_nanoengine())
 128                ret = sa11xx_drv_pcmcia_probe(
 129                        dev, &nanoengine_pcmcia_ops, 0, 2);
 130
 131        return ret;
 132}
 133
 134
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