aboutsummaryrefslogtreecommitdiff
path: root/drivers/pcmcia/xxs1500_ss.c
blob: fd5fbd10aad07e853878ff53a3c5280dbc330bdc (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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
/*
 * PCMCIA socket code for the MyCable XXS1500 system.
 *
 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
 *
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/resource.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>

#include <asm/irq.h>
#include <asm/mach-au1x00/au1000.h>

#define MEM_MAP_SIZE	0x400000
#define IO_MAP_SIZE	0x1000


/*
 * 3.3V cards only; all interfacing is done via gpios:
 *
 * 0/1:  carddetect (00 = card present, xx = huh)
 * 4:	 card irq
 * 204:  reset (high-act)
 * 205:  buffer enable (low-act)
 * 208/209: card voltage key (00,01,10,11)
 * 210:  battwarn
 * 211:  batdead
 * 214:  power (low-act)
 */
#define GPIO_CDA	0
#define GPIO_CDB	1
#define GPIO_CARDIRQ	4
#define GPIO_RESET	204
#define GPIO_OUTEN	205
#define GPIO_VSL	208
#define GPIO_VSH	209
#define GPIO_BATTDEAD	210
#define GPIO_BATTWARN	211
#define GPIO_POWER	214

struct xxs1500_pcmcia_sock {
	struct pcmcia_socket	socket;
	void		*virt_io;

	phys_addr_t	phys_io;
	phys_addr_t	phys_attr;
	phys_addr_t	phys_mem;

	/* previous flags for set_socket() */
	unsigned int old_flags;
};

#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)

static irqreturn_t cdirq(int irq, void *data)
{
	struct xxs1500_pcmcia_sock *sock = data;

	pcmcia_parse_events(&sock->socket, SS_DETECT);

	return IRQ_HANDLED;
}

static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
				    struct socket_state_t *state)
{
	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
	unsigned int changed;

	/* power control */
	switch (state->Vcc) {
	case 0:
		gpio_set_value(GPIO_POWER, 1);	/* power off */
		break;
	case 33:
		gpio_set_value(GPIO_POWER, 0);	/* power on */
		break;
	case 50:
	default:
		return -EINVAL;
	}

	changed = state->flags ^ sock->old_flags;

	if (changed & SS_RESET) {
		if (state->flags & SS_RESET) {
			gpio_set_value(GPIO_RESET, 1);	/* assert reset */
			gpio_set_value(GPIO_OUTEN, 1);	/* buffers off */
		} else {
			gpio_set_value(GPIO_RESET, 0);	/* deassert reset */
			gpio_set_value(GPIO_OUTEN, 0);	/* buffers on */
			msleep(500);
		}
	}

	sock->old_flags = state->flags;

	return 0;
}

static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
				     unsigned int *value)
{
	unsigned int status;
	int i;

	status = 0;

	/* check carddetects: GPIO[0:1] must both be low */
	if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
		status |= SS_DETECT;

	/* determine card voltage: GPIO[208:209] binary value */
	i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);

	switch (i) {
	case 0:
	case 1:
	case 2:
		status |= SS_3VCARD;	/* 3V card */
		break;
	case 3:				/* 5V card, unsupported */
	default:
		status |= SS_XVCARD;	/* treated as unsupported in core */
	}

	/* GPIO214: low active power switch */
	status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;

	/* GPIO204: high-active reset line */
	status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;

	/* other stuff */
	status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
	status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;

	*value = status;

	return 0;
}

static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
{
	gpio_direction_input(GPIO_CDA);
	gpio_direction_input(GPIO_CDB);
	gpio_direction_input(GPIO_VSL);
	gpio_direction_input(GPIO_VSH);
	gpio_direction_input(GPIO_BATTDEAD);
	gpio_direction_input(GPIO_BATTWARN);
	gpio_direction_output(GPIO_RESET, 1);	/* assert reset */
	gpio_direction_output(GPIO_OUTEN, 1);	/* disable buffers */
	gpio_direction_output(GPIO_POWER, 1);	/* power off */

	return 0;
}

static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
{
	return 0;
}

static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
				    struct pccard_io_map *map)
{
	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);

	map->start = (u32)sock->virt_io;
	map->stop = map->start + IO_MAP_SIZE;

	return 0;
}

static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
				     struct pccard_mem_map *map)
{
	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);

	if (map->flags & MAP_ATTRIB)
		map->static_start = sock->phys_attr + map->card_start;
	else
		map->static_start = sock->phys_mem + map->card_start;

	return 0;
}

static struct pccard_operations xxs1500_pcmcia_operations = {
	.init			= xxs1500_pcmcia_sock_init,
	.suspend		= xxs1500_pcmcia_sock_suspend,
	.get_status		= xxs1500_pcmcia_get_status,
	.set_socket		= xxs1500_pcmcia_configure,
	.set_io_map		= au1x00_pcmcia_set_io_map,
	.set_mem_map		= au1x00_pcmcia_set_mem_map,
};

static int __devinit xxs1500_pcmcia_probe(struct platform_device *pdev)
{
	struct xxs1500_pcmcia_sock *sock;
	struct resource *r;
	int ret, irq;

	sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
	if (!sock)
		return -ENOMEM;

	ret = -ENODEV;

	/* 36bit PCMCIA Attribute area address */
	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
	if (!r) {
		dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
		goto out0;
	}
	sock->phys_attr = r->start;

	/* 36bit PCMCIA Memory area address */
	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
	if (!r) {
		dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
		goto out0;
	}
	sock->phys_mem = r->start;

	/* 36bit PCMCIA IO area address */
	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
	if (!r) {
		dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
		goto out0;
	}
	sock->phys_io = r->start;


	/*
	 * PCMCIA client drivers use the inb/outb macros to access
	 * the IO registers.  Since mips_io_port_base is added
	 * to the access address of the mips implementation of
	 * inb/outb, we need to subtract it here because we want
	 * to access the I/O or MEM address directly, without
	 * going through this "mips_io_port_base" mechanism.
	 */
	sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
				 mips_io_port_base);

	if (!sock->virt_io) {
		dev_err(&pdev->dev, "cannot remap IO area\n");
		ret = -ENOMEM;
		goto out0;
	}

	sock->socket.ops	= &xxs1500_pcmcia_operations;
	sock->socket.owner	= THIS_MODULE;
	sock->socket.pci_irq	= gpio_to_irq(GPIO_CARDIRQ);
	sock->socket.features	= SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
	sock->socket.map_size	= MEM_MAP_SIZE;
	sock->socket.io_offset	= (unsigned long)sock->virt_io;
	sock->socket.dev.parent	= &pdev->dev;
	sock->socket.resource_ops = &pccard_static_ops;

	platform_set_drvdata(pdev, sock);

	/* setup carddetect irq: use one of the 2 GPIOs as an
	 * edge detector.
	 */
	irq = gpio_to_irq(GPIO_CDA);
	irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
	ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
	if (ret) {
		dev_err(&pdev->dev, "cannot setup cd irq\n");
		goto out1;
	}

	ret = pcmcia_register_socket(&sock->socket);
	if (ret) {
		dev_err(&pdev->dev, "failed to register\n");
		goto out2;
	}

	printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");

	return 0;

out2:
	free_irq(gpio_to_irq(GPIO_CDA), sock);
out1:
	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
out0:
	kfree(sock);
	return ret;
}

static int __devexit xxs1500_pcmcia_remove(struct platform_device *pdev)
{
	struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);

	pcmcia_unregister_socket(&sock->socket);
	free_irq(gpio_to_irq(GPIO_CDA), sock);
	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
	kfree(sock);

	return 0;
}

static struct platform_driver xxs1500_pcmcia_socket_driver = {
	.driver	= {
		.name	= "xxs1500_pcmcia",
		.owner	= THIS_MODULE,
	},
	.probe		= xxs1500_pcmcia_probe,
	.remove		= __devexit_p(xxs1500_pcmcia_remove),
};

module_platform_driver(xxs1500_pcmcia_socket_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
MODULE_AUTHOR("Manuel Lauss");