Root/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
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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