summaryrefslogtreecommitdiffstats
path: root/drivers/pcmcia/pxa2xx_mainstone.c
blob: aded706c0b9fa941a98a94ff84a3881f38a1da42 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/*
 * linux/drivers/pcmcia/pxa2xx_mainstone.c
 *
 * Mainstone PCMCIA specific routines.
 *
 * Created:	May 12, 2004
 * Author:	Nicolas Pitre
 * Copyright:	MontaVista Software Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <pcmcia/ss.h>

#include <asm/mach-types.h>
#include <asm/irq.h>

#include <mach/pxa2xx-regs.h>
#include <mach/mainstone.h>

#include "soc_common.h"


static struct pcmcia_irqs irqs[] = {
	{ 0, MAINSTONE_S0_CD_IRQ, "PCMCIA0 CD" },
	{ 1, MAINSTONE_S1_CD_IRQ, "PCMCIA1 CD" },
	{ 0, MAINSTONE_S0_STSCHG_IRQ, "PCMCIA0 STSCHG" },
	{ 1, MAINSTONE_S1_STSCHG_IRQ, "PCMCIA1 STSCHG" },
};

static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
	/*
	 * Setup default state of GPIO outputs
	 * before we enable them as outputs.
	 */

	skt->socket.pci_irq = (skt->nr == 0) ? MAINSTONE_S0_IRQ : MAINSTONE_S1_IRQ;
	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
}

static void mst_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
}

static unsigned long mst_pcmcia_status[2];

static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
				    struct pcmcia_state *state)
{
	unsigned long status, flip;

	status = (skt->nr == 0) ? MST_PCMCIA0 : MST_PCMCIA1;
	flip = (status ^ mst_pcmcia_status[skt->nr]) & MST_PCMCIA_nSTSCHG_BVD1;

	/*
	 * Workaround for STSCHG which can't be deasserted:
	 * We therefore disable/enable corresponding IRQs
	 * as needed to avoid IRQ locks.
	 */
	if (flip) {
		mst_pcmcia_status[skt->nr] = status;
		if (status & MST_PCMCIA_nSTSCHG_BVD1)
			enable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
						   : MAINSTONE_S1_STSCHG_IRQ );
		else
			disable_irq( (skt->nr == 0) ? MAINSTONE_S0_STSCHG_IRQ
						    : MAINSTONE_S1_STSCHG_IRQ );
	}

	state->detect = (status & MST_PCMCIA_nCD) ? 0 : 1;
	state->ready  = (status & MST_PCMCIA_nIRQ) ? 1 : 0;
	state->bvd1   = (status & MST_PCMCIA_nSTSCHG_BVD1) ? 1 : 0;
	state->bvd2   = (status & MST_PCMCIA_nSPKR_BVD2) ? 1 : 0;
	state->vs_3v  = (status & MST_PCMCIA_nVS1) ? 0 : 1;
	state->vs_Xv  = (status & MST_PCMCIA_nVS2) ? 0 : 1;
	state->wrprot = 0;  /* not available */
}

static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
				       const socket_state_t *state)
{
	unsigned long power = 0;
	int ret = 0;

	switch (state->Vcc) {
	case 0:  power |= MST_PCMCIA_PWR_VCC_0;  break;
	case 33: power |= MST_PCMCIA_PWR_VCC_33; break;
	case 50: power |= MST_PCMCIA_PWR_VCC_50; break;
	default:
		 printk(KERN_ERR "%s(): bad Vcc %u\n",
				 __func__, state->Vcc);
		 ret = -1;
	}

	switch (state->Vpp) {
	case 0:   power |= MST_PCMCIA_PWR_VPP_0;   break;
	case 120: power |= MST_PCMCIA_PWR_VPP_120; break;
	default:
		  if(state->Vpp == state->Vcc) {
			  power |= MST_PCMCIA_PWR_VPP_VCC;
		  } else {
			  printk(KERN_ERR "%s(): bad Vpp %u\n",
					  __func__, state->Vpp);
			  ret = -1;
		  }
	}

	if (state->flags & SS_RESET)
	       power |= MST_PCMCIA_RESET;

	switch (skt->nr) {
	case 0:  MST_PCMCIA0 = power; break;
	case 1:  MST_PCMCIA1 = power; break;
	default: ret = -1;
	}

	return ret;
}

static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
	.owner			= THIS_MODULE,
	.hw_init		= mst_pcmcia_hw_init,
	.hw_shutdown		= mst_pcmcia_hw_shutdown,
	.socket_state		= mst_pcmcia_socket_state,
	.configure_socket	= mst_pcmcia_configure_socket,
	.nr			= 2,
};

static struct platform_device *mst_pcmcia_device;

static int __init mst_pcmcia_init(void)
{
	int ret;

	if (!machine_is_mainstone())
		return -ENODEV;

	mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	if (!mst_pcmcia_device)
		return -ENOMEM;

	ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
				       sizeof(mst_pcmcia_ops));
	if (ret == 0)
		ret = platform_device_add(mst_pcmcia_device);

	if (ret)
		platform_device_put(mst_pcmcia_device);

	return ret;
}

static void __exit mst_pcmcia_exit(void)
{
	platform_device_unregister(mst_pcmcia_device);
}

fs_initcall(mst_pcmcia_init);
module_exit(mst_pcmcia_exit);

MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-pcmcia");