aboutsummaryrefslogtreecommitdiff
path: root/drivers/pcmcia/pxa2xx_lubbock.c
blob: c21888eebb58fe19266351fa9b11bc9f5bcdae05 (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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
/*
 * linux/drivers/pcmcia/pxa2xx_lubbock.c
 *
 * Author:	George Davis
 * Created:	Jan 10, 2002
 * 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.
 *
 * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
 *
 * Lubbock PCMCIA specific routines.
 *
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <mach/hardware.h>
#include <asm/hardware/sa1111.h>
#include <asm/mach-types.h>
#include <mach/lubbock.h>

#include "sa1111_generic.h"

static int
lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
				const socket_state_t *state)
{
	struct sa1111_pcmcia_socket *s = to_skt(skt);
	unsigned int pa_dwr_mask, pa_dwr_set, misc_mask, misc_set;
	int ret = 0;

	pa_dwr_mask = pa_dwr_set = misc_mask = misc_set = 0;

	/* Lubbock uses the Maxim MAX1602, with the following connections:
	 *
	 * Socket 0 (PCMCIA):
	 *	MAX1602	Lubbock		Register
	 *	Pin	Signal
	 *	-----	-------		----------------------
	 *	A0VPP	S0_PWR0		SA-1111 GPIO A<0>
	 *	A1VPP	S0_PWR1		SA-1111 GPIO A<1>
	 *	A0VCC	S0_PWR2		SA-1111 GPIO A<2>
	 *	A1VCC	S0_PWR3		SA-1111 GPIO A<3>
	 *	VX	VCC
	 *	VY	+3.3V
	 *	12IN	+12V
	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
	 *
	 * Socket 1 (CF):
	 *	MAX1602	Lubbock		Register
	 *	Pin	Signal
	 *	-----	-------		----------------------
	 *	A0VPP	GND		VPP is not connected
	 *	A1VPP	GND		VPP is not connected
	 *	A0VCC	S1_PWR0		MISC_WR<14>
	 *	A1VCC	S1_PWR1		MISC_WR<15>
	 *	VX	VCC
	 *	VY	+3.3V
	 *	12IN	GND		VPP is not connected
	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
	 *
	 */

 again:
	switch (skt->nr) {
	case 0:
		pa_dwr_mask = GPIO_A0 | GPIO_A1 | GPIO_A2 | GPIO_A3;

		switch (state->Vcc) {
		case 0: /* Hi-Z */
			break;

		case 33: /* VY */
			pa_dwr_set |= GPIO_A3;
			break;

		case 50: /* VX */
			pa_dwr_set |= GPIO_A2;
			break;

		default:
			printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
			       __func__, state->Vcc);
			ret = -1;
		}

		switch (state->Vpp) {
		case 0: /* Hi-Z */
			break;

		case 120: /* 12IN */
			pa_dwr_set |= GPIO_A1;
			break;

		default: /* VCC */
			if (state->Vpp == state->Vcc)
				pa_dwr_set |= GPIO_A0;
			else {
				printk(KERN_ERR "%s(): unrecognized Vpp %u\n",
				       __func__, state->Vpp);
				ret = -1;
				break;
			}
		}
		break;

	case 1:
		misc_mask = (1 << 15) | (1 << 14);

		switch (state->Vcc) {
		case 0: /* Hi-Z */
			break;

		case 33: /* VY */
			misc_set |= 1 << 15;
			break;

		case 50: /* VX */
			misc_set |= 1 << 14;
			break;

		default:
			printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
			       __func__, state->Vcc);
			ret = -1;
			break;
		}

		if (state->Vpp != state->Vcc && state->Vpp != 0) {
			printk(KERN_ERR "%s(): CF slot cannot support Vpp %u\n",
			       __func__, state->Vpp);
			ret = -1;
			break;
		}
		break;

	default:
		ret = -1;
	}

	if (ret == 0)
		ret = sa1111_pcmcia_configure_socket(skt, state);

	if (ret == 0) {
		lubbock_set_misc_wr(misc_mask, misc_set);
		sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
	}

#if 1
	if (ret == 0 && state->Vcc == 33) {
		struct pcmcia_state new_state;

		/*
		 * HACK ALERT:
		 * We can't sense the voltage properly on Lubbock before
		 * actually applying some power to the socket (catch 22).
		 * Resense the socket Voltage Sense pins after applying
		 * socket power.
		 *
		 * Note: It takes about 2.5ms for the MAX1602 VCC output
		 * to rise.
		 */
		mdelay(3);

		sa1111_pcmcia_socket_state(skt, &new_state);

		if (!new_state.vs_3v && !new_state.vs_Xv) {
			/*
			 * Switch to 5V,  Configure socket with 5V voltage
			 */
			lubbock_set_misc_wr(misc_mask, 0);
			sa1111_set_io(s->dev, pa_dwr_mask, 0);

			/*
			 * It takes about 100ms to turn off Vcc.
			 */
			mdelay(100);

			/*
			 * We need to hack around the const qualifier as
			 * well to keep this ugly workaround localized and
			 * not force it to the rest of the code. Barf bags
			 * available in the seat pocket in front of you!
			 */
			((socket_state_t *)state)->Vcc = 50;
			((socket_state_t *)state)->Vpp = 50;
			goto again;
		}
	}
#endif

	return ret;
}

static struct pcmcia_low_level lubbock_pcmcia_ops = {
	.owner			= THIS_MODULE,
	.configure_socket	= lubbock_pcmcia_configure_socket,
	.socket_init		= sa1111_pcmcia_socket_init,
	.first			= 0,
	.nr			= 2,
};

#include "pxa2xx_base.h"

int pcmcia_lubbock_init(struct sa1111_dev *sadev)
{
	int ret = -ENODEV;

	if (machine_is_lubbock()) {
		/*
		 * Set GPIO_A<3:0> to be outputs for the MAX1600,
		 * and switch to standby mode.
		 */
		sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
		sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
		sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);

		/* Set CF Socket 1 power to standby mode. */
		lubbock_set_misc_wr((1 << 15) | (1 << 14), 0);

		pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
		pxa2xx_configure_sockets(&sadev->dev);
		ret = sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
				pxa2xx_drv_pcmcia_add_one);
	}

	return ret;
}

MODULE_LICENSE("GPL");