File: omap_cf.c

package info (click to toggle)
linux 4.19.20-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 954,852 kB
  • sloc: ansic: 16,749,828; asm: 271,286; makefile: 38,257; sh: 32,808; perl: 27,671; python: 21,022; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (359 lines) | stat: -rw-r--r-- 8,963 bytes parent folder | download | duplicates (7)
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
/*
 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
 *
 * Copyright (c) 2005 David Brownell
 *
 * 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.
 */

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

#include <pcmcia/ss.h>

#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/sizes.h>

#include <mach/mux.h>
#include <mach/tc.h>


/* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
 * hard-wired timings to support Compact Flash memory cards; they won't work
 * with various other devices (like WLAN adapters) without some external
 * logic to help out.
 *
 * NOTE:  CF controller docs disagree with address space docs as to where
 * CF_BASE really lives; this is a doc erratum.
 */
#define	CF_BASE	0xfffe2800

/* status; read after IRQ */
#define CF_STATUS			(CF_BASE + 0x00)
#	define	CF_STATUS_BAD_READ	(1 << 2)
#	define	CF_STATUS_BAD_WRITE	(1 << 1)
#	define	CF_STATUS_CARD_DETECT	(1 << 0)

/* which chipselect (CS0..CS3) is used for CF (active low) */
#define CF_CFG				(CF_BASE + 0x02)

/* card reset */
#define CF_CONTROL			(CF_BASE + 0x04)
#	define	CF_CONTROL_RESET	(1 << 0)

#define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))

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

static const char driver_name[] = "omap_cf";

struct omap_cf_socket {
	struct pcmcia_socket	socket;

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

	struct platform_device	*pdev;
	unsigned long		phys_cf;
	u_int			irq;
	struct resource		iomem;
};

#define	POLL_INTERVAL		(2 * HZ)

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

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

/* the timer is primarily to kick this socket's pccardd */
static void omap_cf_timer(struct timer_list *t)
{
	struct omap_cf_socket	*cf = from_timer(cf, t, timer);
	unsigned		present = omap_cf_present();

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

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

/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
 * claim the card's IRQ.  It may also detect some card insertions, but
 * not removals; it can't always eliminate timer irqs.
 */
static irqreturn_t omap_cf_irq(int irq, void *_cf)
{
	struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf;

	omap_cf_timer(&cf->timer);
	return IRQ_HANDLED;
}

static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
	if (!sp)
		return -EINVAL;

	/* NOTE CF is always 3VCARD */
	if (omap_cf_present()) {
		struct omap_cf_socket	*cf;

		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
		cf = container_of(s, struct omap_cf_socket, socket);
		s->pcmcia_irq = 0;
		s->pci_irq = cf->irq;
	} else
		*sp = 0;
	return 0;
}

static int
omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{
	u16		control;

	/* REVISIT some non-OSK boards may support power switching */
	switch (s->Vcc) {
	case 0:
	case 33:
		break;
	default:
		return -EINVAL;
	}

	control = omap_readw(CF_CONTROL);
	if (s->flags & SS_RESET)
		omap_writew(CF_CONTROL_RESET, CF_CONTROL);
	else
		omap_writew(0, CF_CONTROL);

	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 omap_cf_ss_suspend(struct pcmcia_socket *s)
{
	pr_debug("%s: %s\n", driver_name, __func__);
	return omap_cf_set_socket(s, &dead_socket);
}

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

static int
omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
	struct omap_cf_socket	*cf;

	cf = container_of(s, struct omap_cf_socket, socket);
	io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
	io->start = cf->phys_cf + SZ_4K;
	io->stop = io->start + SZ_2K - 1;
	return 0;
}

static int
omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
	struct omap_cf_socket	*cf;

	if (map->card_start)
		return -EINVAL;
	cf = container_of(s, struct omap_cf_socket, socket);
	map->static_start = cf->phys_cf;
	map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
	if (map->flags & MAP_ATTRIB)
		map->static_start += SZ_2K;
	return 0;
}

static struct pccard_operations omap_cf_ops = {
	.init			= omap_cf_ss_init,
	.suspend		= omap_cf_ss_suspend,
	.get_status		= omap_cf_get_status,
	.set_socket		= omap_cf_set_socket,
	.set_io_map		= omap_cf_set_io_map,
	.set_mem_map		= omap_cf_set_mem_map,
};

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

/*
 * NOTE:  right now the only board-specific platform_data is
 * "what chipselect is used".  Boards could want more.
 */

static int __init omap_cf_probe(struct platform_device *pdev)
{
	unsigned		seg;
	struct omap_cf_socket	*cf;
	int			irq;
	int			status;

	seg = (int) pdev->dev.platform_data;
	if (seg == 0 || seg > 3)
		return -ENODEV;

	/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return -EINVAL;

	cf = kzalloc(sizeof *cf, GFP_KERNEL);
	if (!cf)
		return -ENOMEM;
	timer_setup(&cf->timer, omap_cf_timer, 0);

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

	/* this primarily just shuts up irq handling noise */
	status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
			driver_name, cf);
	if (status < 0)
		goto fail0;
	cf->irq = irq;
	cf->socket.pci_irq = irq;

	switch (seg) {
	/* NOTE: CS0 could be configured too ... */
	case 1:
		cf->phys_cf = OMAP_CS1_PHYS;
		break;
	case 2:
		cf->phys_cf = OMAP_CS2_PHYS;
		break;
	case 3:
		cf->phys_cf = omap_cs3_phys();
		break;
	default:
		goto  fail1;
	}
	cf->iomem.start = cf->phys_cf;
	cf->iomem.end = cf->iomem.end + SZ_8K - 1;
	cf->iomem.flags = IORESOURCE_MEM;

	/* pcmcia layer only remaps "real" memory */
	cf->socket.io_offset = (unsigned long)
			ioremap(cf->phys_cf + SZ_4K, SZ_2K);
	if (!cf->socket.io_offset)
		goto fail1;

	if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
		goto fail1;

	/* NOTE:  CF conflicts with MMC1 */
	omap_cfg_reg(W11_1610_CF_CD1);
	omap_cfg_reg(P11_1610_CF_CD2);
	omap_cfg_reg(R11_1610_CF_IOIS16);
	omap_cfg_reg(V10_1610_CF_IREQ);
	omap_cfg_reg(W10_1610_CF_RESET);

	omap_writew(~(1 << seg), CF_CFG);

	pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);

	/* NOTE:  better EMIFS setup might support more cards; but the
	 * TRM only shows how to affect regular flash signals, not their
	 * CF/PCMCIA variants...
	 */
	pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
		seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
	omap_writel(0x0004a1b3, EMIFS_CCS(seg));	/* synch mode 4 etc */
	omap_writel(0x00000000, EMIFS_ACS(seg));	/* OE hold/setup */

	/* CF uses armxor_ck, which is "always" available */

	pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
		omap_readw(CF_STATUS), omap_readw(CF_CFG),
		omap_readw(CF_CONTROL),
		omap_cf_present() ? "present" : "(not present)");

	cf->socket.owner = THIS_MODULE;
	cf->socket.dev.parent = &pdev->dev;
	cf->socket.ops = &omap_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;
	cf->socket.io[0].res = &cf->iomem;

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

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

fail2:
	release_mem_region(cf->phys_cf, SZ_8K);
fail1:
	if (cf->socket.io_offset)
		iounmap((void __iomem *) cf->socket.io_offset);
	free_irq(irq, cf);
fail0:
	kfree(cf);
	return status;
}

static int __exit omap_cf_remove(struct platform_device *pdev)
{
	struct omap_cf_socket *cf = platform_get_drvdata(pdev);

	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, SZ_8K);
	free_irq(cf->irq, cf);
	kfree(cf);
	return 0;
}

static struct platform_driver omap_cf_driver = {
	.driver = {
		.name	= (char *) driver_name,
	},
	.remove		= __exit_p(omap_cf_remove),
};

static int __init omap_cf_init(void)
{
	if (cpu_is_omap16xx())
		return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
	return -ENODEV;
}

static void __exit omap_cf_exit(void)
{
	if (cpu_is_omap16xx())
		platform_driver_unregister(&omap_cf_driver);
}

module_init(omap_cf_init);
module_exit(omap_cf_exit);

MODULE_DESCRIPTION("OMAP CF Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:omap_cf");