drivers/pcmcia/sa1100_nanoengine.c

   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
  38 struct nanoengine_pins {
  39         unsigned output_pins;
  40         unsigned clear_outputs;
  41         int gpio_rst;
  42         int gpio_cd;
  43         int gpio_rdy;
  44 };
  45
  46 static 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
  58 unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts);
  59
  60 static 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
  81 static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  82 {
  83         gpio_free(nano_skts[skt->nr].gpio_rst);
  84 }
  85
  86 static 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
  99 static 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
 113 static 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
 123 int 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