aboutsummaryrefslogtreecommitdiff
path: root/drivers/pcmcia/bfin_cf_pcmcia.c
blob: 971991bab975a2ec0c91ab2724b9dd8c7f9cb90d (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
/*
 * file: drivers/pcmcia/bfin_cf.c
 *
 * based on: drivers/pcmcia/omap_cf.c
 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
 *
 * Copyright (c) 2005 David Brownell
 * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
 *
 * bugs:         enter bugs at http://blackfin.uclinux.org/
 *
 * 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, 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; see the file copying.
 * if not, write to the free software foundation,
 * 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/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <pcmcia/ss.h>
#include <pcmcia/cisreg.h>
#include <asm/gpio.h>

#define	SZ_1K	0x00000400
#define	SZ_8K	0x00002000
#define	SZ_2K	(2 * SZ_1K)

#define	POLL_INTERVAL	(2 * HZ)

#define	CF_ATASEL_ENA 	0x20311802	/* Inverts RESET */
#define	CF_ATASEL_DIS 	0x20311800

#define bfin_cf_present(pfx) (gpio_get_value(pfx))

/*--------------------------------------------------------------------------*/

static const char driver_name[] = "bfin_cf_pcmcia";

struct bfin_cf_socket {
	struct pcmcia_socket socket;

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

	struct platform_device *pdev;
	unsigned long phys_cf_io;
	unsigned long phys_cf_attr;
	u_int irq;
	u_short cd_pfx;
};

/*--------------------------------------------------------------------------*/
static int bfin_cf_reset(void)
{
	outw(0, CF_ATASEL_ENA);
	mdelay(200);
	outw(0, CF_ATASEL_DIS);

	return 0;
}

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

/* the timer is primarily to kick this socket's pccardd */
static void bfin_cf_timer(unsigned long _cf)
{
	struct bfin_cf_socket *cf = (void *)_cf;
	unsigned short present = bfin_cf_present(cf->cd_pfx);

	if (present != cf->present) {
		cf->present = present;
		dev_dbg(&cf->pdev->dev, ": card %s\n",
			 present ? "present" : "gone");
		pcmcia_parse_events(&cf->socket, SS_DETECT);
	}

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

static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
	struct bfin_cf_socket *cf;

	if (!sp)
		return -EINVAL;

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

	if (bfin_cf_present(cf->cd_pfx)) {
		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
		s->pcmcia_irq = 0;
		s->pci_irq = cf->irq;

	} else
		*sp = 0;
	return 0;
}

static int
bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{

	struct bfin_cf_socket *cf;
	cf = container_of(sock, struct bfin_cf_socket, socket);

	switch (s->Vcc) {
	case 0:
	case 33:
		break;
	case 50:
		break;
	default:
		return -EINVAL;
	}

	if (s->flags & SS_RESET) {
		disable_irq(cf->irq);
		bfin_cf_reset();
		enable_irq(cf->irq);
	}

	dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
		 s->Vcc, s->io_irq, s->flags, s->csc_mask);

	return 0;
}

static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
{
	return bfin_cf_set_socket(s, &dead_socket);
}

/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */

static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
	struct bfin_cf_socket *cf;

	cf = container_of(s, struct bfin_cf_socket, socket);
	io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
	io->start = cf->phys_cf_io;
	io->stop = io->start + SZ_2K - 1;
	return 0;
}

static int
bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
	struct bfin_cf_socket *cf;

	if (map->card_start)
		return -EINVAL;
	cf = container_of(s, struct bfin_cf_socket, socket);
	map->static_start = cf->phys_cf_io;
	map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
	if (map->flags & MAP_ATTRIB)
		map->static_start = cf->phys_cf_attr;

	return 0;
}

static struct pccard_operations bfin_cf_ops = {
	.init = bfin_cf_ss_init,
	.suspend = bfin_cf_ss_suspend,
	.get_status = bfin_cf_get_status,
	.set_socket = bfin_cf_set_socket,
	.set_io_map = bfin_cf_set_io_map,
	.set_mem_map = bfin_cf_set_mem_map,
};

/*--------------------------------------------------------------------------*/

static int bfin_cf_probe(struct platform_device *pdev)
{
	struct bfin_cf_socket *cf;
	struct resource *io_mem, *attr_mem;
	int irq;
	unsigned short cd_pfx;
	int status = 0;

	dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0)
		return -EINVAL;

	cd_pfx = platform_get_irq(pdev, 1);	/*Card Detect GPIO PIN */

	if (gpio_request(cd_pfx, "pcmcia: CD")) {
		dev_err(&pdev->dev,
		       "Failed ro request Card Detect GPIO_%d\n",
		       cd_pfx);
		return -EBUSY;
	}
	gpio_direction_input(cd_pfx);

	cf = kzalloc(sizeof *cf, GFP_KERNEL);
	if (!cf) {
		gpio_free(cd_pfx);
		return -ENOMEM;
	}

	cf->cd_pfx = cd_pfx;

	setup_timer(&cf->timer, bfin_cf_timer, (unsigned long)cf);

	cf->pdev = pdev;
	platform_set_drvdata(pdev, cf);

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

	irq_set_irq_type(irq, IRQF_TRIGGER_LOW);

	io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	if (!io_mem || !attr_mem)
		goto fail0;

	cf->phys_cf_io = io_mem->start;
	cf->phys_cf_attr = attr_mem->start;

	/* pcmcia layer only remaps "real" memory */
	cf->socket.io_offset = (unsigned long)
	    ioremap(cf->phys_cf_io, SZ_2K);

	if (!cf->socket.io_offset)
		goto fail0;

	dev_err(&pdev->dev, ": on irq %d\n", irq);

	dev_dbg(&pdev->dev, ": %s\n",
		 bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");

	cf->socket.owner = THIS_MODULE;
	cf->socket.dev.parent = &pdev->dev;
	cf->socket.ops = &bfin_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 = SZ_2K;

	status = pcmcia_register_socket(&cf->socket);
	if (status < 0)
		goto fail2;

	cf->active = 1;
	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
	return 0;

fail2:
	iounmap((void __iomem *)cf->socket.io_offset);
	release_mem_region(cf->phys_cf_io, SZ_8K);

fail0:
	gpio_free(cf->cd_pfx);
	kfree(cf);
	platform_set_drvdata(pdev, NULL);

	return status;
}

static int bfin_cf_remove(struct platform_device *pdev)
{
	struct bfin_cf_socket *cf = platform_get_drvdata(pdev);

	gpio_free(cf->cd_pfx);
	cf->active = 0;
	pcmcia_unregister_socket(&cf->socket);
	del_timer_sync(&cf->timer);
	iounmap((void __iomem *)cf->socket.io_offset);
	release_mem_region(cf->phys_cf_io, SZ_8K);
	platform_set_drvdata(pdev, NULL);
	kfree(cf);
	return 0;
}

static struct platform_driver bfin_cf_driver = {
	.driver = {
		   .name = driver_name,
		   .owner = THIS_MODULE,
		   },
	.probe = bfin_cf_probe,
	.remove = bfin_cf_remove,
};

module_platform_driver(bfin_cf_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
MODULE_LICENSE("GPL");