summaryrefslogtreecommitdiffstats
path: root/drivers/pcmcia/electra_cf.c
blob: 06ad3e5e7d3d246b9acab61dd049a3f41c430f50 (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
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
/*
 * Copyright (C) 2007 PA Semi, Inc
 *
 * Maintained by: Olof Johansson <olof@lixom.net>
 *
 * Based on drivers/pcmcia/omap_cf.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/of_platform.h>
#include <linux/slab.h>

#include <pcmcia/ss.h>

static const char driver_name[] = "electra-cf";

struct electra_cf_socket {
	struct pcmcia_socket	socket;

	struct timer_list	timer;
	unsigned		present:1;
	unsigned		active:1;

	struct platform_device	*ofdev;
	unsigned long		mem_phys;
	void __iomem *		mem_base;
	unsigned long		mem_size;
	void __iomem *		io_virt;
	unsigned int		io_base;
	unsigned int		io_size;
	u_int			irq;
	struct resource		iomem;
	void __iomem *		gpio_base;
	int			gpio_detect;
	int			gpio_vsense;
	int			gpio_3v;
	int			gpio_5v;
};

#define	POLL_INTERVAL		(2 * HZ)


static int electra_cf_present(struct electra_cf_socket *cf)
{
	unsigned int gpio;

	gpio = in_le32(cf->gpio_base+0x40);
	return !(gpio & (1 << cf->gpio_detect));
}

static int electra_cf_ss_init(struct pcmcia_socket *s)
{
	return 0;
}

/* the timer is primarily to kick this socket's pccardd */
static void electra_cf_timer(unsigned long _cf)
{
	struct electra_cf_socket *cf = (void *) _cf;
	int present = electra_cf_present(cf);

	if (present != cf->present) {
		cf->present = present;
		pcmcia_parse_events(&cf->socket, SS_DETECT);
	}

	if (cf->active)
		mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
}

static irqreturn_t electra_cf_irq(int irq, void *_cf)
{
	electra_cf_timer((unsigned long)_cf);
	return IRQ_HANDLED;
}

static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
	struct electra_cf_socket *cf;

	if (!sp)
		return -EINVAL;

	cf = container_of(s, struct electra_cf_socket, socket);

	/* NOTE CF is always 3VCARD */
	if (electra_cf_present(cf)) {
		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;

		s->pci_irq = cf->irq;
	} else
		*sp = 0;
	return 0;
}

static int electra_cf_set_socket(struct pcmcia_socket *sock,
				 struct socket_state_t *s)
{
	unsigned int gpio;
	unsigned int vcc;
	struct electra_cf_socket *cf;

	cf = container_of(sock, struct electra_cf_socket, socket);

	/* "reset" means no power in our case */
	vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;

	switch (vcc) {
	case 0:
		gpio = 0;
		break;
	case 33:
		gpio = (1 << cf->gpio_3v);
		break;
	case 5:
		gpio = (1 << cf->gpio_5v);
		break;
	default:
		return -EINVAL;
	}

	gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
	gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
	out_le32(cf->gpio_base+0x90, gpio);

	pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
		driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);

	return 0;
}

static int electra_cf_set_io_map(struct pcmcia_socket *s,
				 struct pccard_io_map *io)
{
	return 0;
}

static int electra_cf_set_mem_map(struct pcmcia_socket *s,
				  struct pccard_mem_map *map)
{
	struct electra_cf_socket *cf;

	if (map->card_start)
		return -EINVAL;
	cf = container_of(s, struct electra_cf_socket, socket);
	map->static_start = cf->mem_phys;
	map->flags &= MAP_ACTIVE|MAP_ATTRIB;
	if (!(map->flags & MAP_ATTRIB))
		map->static_start += 0x800;
	return 0;
}

static struct pccard_operations electra_cf_ops = {
	.init			= electra_cf_ss_init,
	.get_status		= electra_cf_get_status,
	.set_socket		= electra_cf_set_socket,
	.set_io_map		= electra_cf_set_io_map,
	.set_mem_map		= electra_cf_set_mem_map,
};

static int __devinit electra_cf_probe(struct platform_device *ofdev)
{
	struct device *device = &ofdev->dev;
	struct device_node *np = ofdev->dev.of_node;
	struct electra_cf_socket   *cf;
	struct resource mem, io;
	int status;
	const unsigned int *prop;
	int err;
	struct vm_struct *area;

	err = of_address_to_resource(np, 0, &mem);
	if (err)
		return -EINVAL;

	err = of_address_to_resource(np, 1, &io);
	if (err)
		return -EINVAL;

	cf = kzalloc(sizeof *cf, GFP_KERNEL);
	if (!cf)
		return -ENOMEM;

	setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
	cf->irq = NO_IRQ;

	cf->ofdev = ofdev;
	cf->mem_phys = mem.start;
	cf->mem_size = PAGE_ALIGN(resource_size(&mem));
	cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
	cf->io_size = PAGE_ALIGN(resource_size(&io));

	area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
	if (area == NULL)
		return -ENOMEM;

	cf->io_virt = (void __iomem *)(area->addr);

	cf->gpio_base = ioremap(0xfc103000, 0x1000);
	dev_set_drvdata(device, cf);

	if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
	    (__ioremap_at(io.start, cf->io_virt, cf->io_size,
		_PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
		dev_err(device, "can't ioremap ranges\n");
		status = -ENOMEM;
		goto fail1;
	}


	cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;

	cf->iomem.start = (unsigned long)cf->mem_base;
	cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
	cf->iomem.flags = IORESOURCE_MEM;

	cf->irq = irq_of_parse_and_map(np, 0);

	status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
			     driver_name, cf);
	if (status < 0) {
		dev_err(device, "request_irq failed\n");
		goto fail1;
	}

	cf->socket.pci_irq = cf->irq;

	prop = of_get_property(np, "card-detect-gpio", NULL);
	if (!prop)
		goto fail1;
	cf->gpio_detect = *prop;

	prop = of_get_property(np, "card-vsense-gpio", NULL);
	if (!prop)
		goto fail1;
	cf->gpio_vsense = *prop;

	prop = of_get_property(np, "card-3v-gpio", NULL);
	if (!prop)
		goto fail1;
	cf->gpio_3v = *prop;

	prop = of_get_property(np, "card-5v-gpio", NULL);
	if (!prop)
		goto fail1;
	cf->gpio_5v = *prop;

	cf->socket.io_offset = cf->io_base;

	/* reserve chip-select regions */
	if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
		status = -ENXIO;
		dev_err(device, "Can't claim memory region\n");
		goto fail1;
	}

	if (!request_region(cf->io_base, cf->io_size, driver_name)) {
		status = -ENXIO;
		dev_err(device, "Can't claim I/O region\n");
		goto fail2;
	}

	cf->socket.owner = THIS_MODULE;
	cf->socket.dev.parent = &ofdev->dev;
	cf->socket.ops = &electra_cf_ops;
	cf->socket.resource_ops = &pccard_static_ops;
	cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
				SS_CAP_MEM_ALIGN;
	cf->socket.map_size = 0x800;

	status = pcmcia_register_socket(&cf->socket);
	if (status < 0) {
		dev_err(device, "pcmcia_register_socket failed\n");
		goto fail3;
	}

	dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
		 cf->mem_phys, io.start, cf->irq);

	cf->active = 1;
	electra_cf_timer((unsigned long)cf);
	return 0;

fail3:
	release_region(cf->io_base, cf->io_size);
fail2:
	release_mem_region(cf->mem_phys, cf->mem_size);
fail1:
	if (cf->irq != NO_IRQ)
		free_irq(cf->irq, cf);

	if (cf->io_virt)
		__iounmap_at(cf->io_virt, cf->io_size);
	if (cf->mem_base)
		iounmap(cf->mem_base);
	if (cf->gpio_base)
		iounmap(cf->gpio_base);
	device_init_wakeup(&ofdev->dev, 0);
	kfree(cf);
	return status;

}

static int __devexit electra_cf_remove(struct platform_device *ofdev)
{
	struct device *device = &ofdev->dev;
	struct electra_cf_socket *cf;

	cf = dev_get_drvdata(device);

	cf->active = 0;
	pcmcia_unregister_socket(&cf->socket);
	free_irq(cf->irq, cf);
	del_timer_sync(&cf->timer);

	__iounmap_at(cf->io_virt, cf->io_size);
	iounmap(cf->mem_base);
	iounmap(cf->gpio_base);
	release_mem_region(cf->mem_phys, cf->mem_size);
	release_region(cf->io_base, cf->io_size);

	kfree(cf);

	return 0;
}

static const struct of_device_id electra_cf_match[] = {
	{
		.compatible   = "electra-cf",
	},
	{},
};
MODULE_DEVICE_TABLE(of, electra_cf_match);

static struct platform_driver electra_cf_driver = {
	.driver = {
		.name = (char *)driver_name,
		.owner = THIS_MODULE,
		.of_match_table = electra_cf_match,
	},
	.probe	  = electra_cf_probe,
	.remove   = electra_cf_remove,
};

static int __init electra_cf_init(void)
{
	return platform_driver_register(&electra_cf_driver);
}
module_init(electra_cf_init);

static void __exit electra_cf_exit(void)
{
	platform_driver_unregister(&electra_cf_driver);
}
module_exit(electra_cf_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("PA Semi Electra CF driver");
OpenPOWER on IntegriCloud