aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pcmcia/bcm63xx_pcmcia.c
blob: 16f573173471a89afac887d1df1a8ba118e95a46 (plain) (blame)
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
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/gpio.h>

#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>
#include "bcm63xx_pcmcia.h"

#define PFX	"bcm63xx_pcmcia: "

#ifdef CONFIG_CARDBUS
/* if cardbus is used, platform device needs reference to actual pci
 * device */
static struct pci_dev *bcm63xx_cb_dev;
#endif

/*
 * read/write helper for pcmcia regs
 */
static inline u32 pcmcia_readl(struct bcm63xx_pcmcia_socket *skt, u32 off)
{
	return bcm_readl(skt->base + off);
}

static inline void pcmcia_writel(struct bcm63xx_pcmcia_socket *skt,
				 u32 val, u32 off)
{
	bcm_writel(val, skt->base + off);
}

/*
 * This callback should (re-)initialise the socket, turn on status
 * interrupts and PCMCIA bus, and wait for power to stabilise so that
 * the card status signals report correctly.
 *
 * Hardware cannot do that.
 */
static int bcm63xx_pcmcia_sock_init(struct pcmcia_socket *sock)
{
	return 0;
}

/*
 * This callback should remove power on the socket, disable IRQs from
 * the card, turn off status interrupts, and disable the PCMCIA bus.
 *
 * Hardware cannot do that.
 */
static int bcm63xx_pcmcia_suspend(struct pcmcia_socket *sock)
{
	return 0;
}

/*
 * Implements the set_socket() operation for the in-kernel PCMCIA
 * service (formerly SS_SetSocket in Card Services). We more or
 * less punt all of this work and let the kernel handle the details
 * of power configuration, reset, &c. We also record the value of
 * `state' in order to regurgitate it to the PCMCIA core later.
 */
static int bcm63xx_pcmcia_set_socket(struct pcmcia_socket *sock,
				     socket_state_t *state)
{
	struct bcm63xx_pcmcia_socket *skt;
	unsigned long flags;
	u32 val;

	skt = sock->driver_data;

	spin_lock_irqsave(&skt->lock, flags);

	/* note: hardware cannot control socket power, so we will
	 * always report SS_POWERON */

	/* apply socket reset */
	val = pcmcia_readl(skt, PCMCIA_C1_REG);
	if (state->flags & SS_RESET)
		val |= PCMCIA_C1_RESET_MASK;
	else
		val &= ~PCMCIA_C1_RESET_MASK;

	/* reverse reset logic for cardbus card */
	if (skt->card_detected && (skt->card_type & CARD_CARDBUS))
		val ^= PCMCIA_C1_RESET_MASK;

	pcmcia_writel(skt, val, PCMCIA_C1_REG);

	/* keep requested state for event reporting */
	skt->requested_state = *state;

	spin_unlock_irqrestore(&skt->lock, flags);

	return 0;
}

/*
 * identity cardtype from VS[12] input, CD[12] input while only VS2 is
 * floating, and CD[12] input while only VS1 is floating
 */
enum {
	IN_VS1 = (1 << 0),
	IN_VS2 = (1 << 1),
	IN_CD1_VS2H = (1 << 2),
	IN_CD2_VS2H = (1 << 3),
	IN_CD1_VS1H = (1 << 4),
	IN_CD2_VS1H = (1 << 5),
};

static const u8 vscd_to_cardtype[] = {

	/* VS1 float, VS2 float */
	[IN_VS1 | IN_VS2] = (CARD_PCCARD | CARD_5V),

	/* VS1 grounded, VS2 float */
	[IN_VS2] = (CARD_PCCARD | CARD_5V | CARD_3V),

	/* VS1 grounded, VS2 grounded */
	[0] = (CARD_PCCARD | CARD_5V | CARD_3V | CARD_XV),

	/* VS1 tied to CD1, VS2 float */
	[IN_VS1 | IN_VS2 | IN_CD1_VS1H] = (CARD_CARDBUS | CARD_3V),

	/* VS1 grounded, VS2 tied to CD2 */
	[IN_VS2 | IN_CD2_VS2H] = (CARD_CARDBUS | CARD_3V | CARD_XV),

	/* VS1 tied to CD2, VS2 grounded */
	[IN_VS1 | IN_CD2_VS1H] = (CARD_CARDBUS | CARD_3V | CARD_XV | CARD_YV),

	/* VS1 float, VS2 grounded */
	[IN_VS1] = (CARD_PCCARD | CARD_XV),

	/* VS1 float, VS2 tied to CD2 */
	[IN_VS1 | IN_VS2 | IN_CD2_VS2H] = (CARD_CARDBUS | CARD_3V),

	/* VS1 float, VS2 tied to CD1 */
	[IN_VS1 | IN_VS2 | IN_CD1_VS2H] = (CARD_CARDBUS | CARD_XV | CARD_YV),

	/* VS1 tied to CD2, VS2 float */
	[IN_VS1 | IN_VS2 | IN_CD2_VS1H] = (CARD_CARDBUS | CARD_YV),

	/* VS2 grounded, VS1 is tied to CD1, CD2 is grounded */
	[IN_VS1 | IN_CD1_VS1H] = 0, /* ignore cardbay */
};

/*
 * poll hardware to check card insertion status
 */
static unsigned int __get_socket_status(struct bcm63xx_pcmcia_socket *skt)
{
	unsigned int stat;
	u32 val;

	stat = 0;

	/* check CD for card presence */
	val = pcmcia_readl(skt, PCMCIA_C1_REG);

	if (!(val & PCMCIA_C1_CD1_MASK) && !(val & PCMCIA_C1_CD2_MASK))
		stat |= SS_DETECT;

	/* if new insertion, detect cardtype */
	if ((stat & SS_DETECT) && !skt->card_detected) {
		unsigned int stat = 0;

		/* float VS1, float VS2 */
		val |= PCMCIA_C1_VS1OE_MASK;
		val |= PCMCIA_C1_VS2OE_MASK;
		pcmcia_writel(skt, val, PCMCIA_C1_REG);

		/* wait for output to stabilize and read VS[12] */
		udelay(10);
		val = pcmcia_readl(skt, PCMCIA_C1_REG);
		stat |= (val & PCMCIA_C1_VS1_MASK) ? IN_VS1 : 0;
		stat |= (val & PCMCIA_C1_VS2_MASK) ? IN_VS2 : 0;

		/* drive VS1 low, float VS2 */
		val &= ~PCMCIA_C1_VS1OE_MASK;
		val |= PCMCIA_C1_VS2OE_MASK;
		pcmcia_writel(skt, val, PCMCIA_C1_REG);

		/* wait for output to stabilize and read CD[12] */
		udelay(10);
		val = pcmcia_readl(skt, PCMCIA_C1_REG);
		stat |= (val & PCMCIA_C1_CD1_MASK) ? IN_CD1_VS2H : 0;
		stat |= (val & PCMCIA_C1_CD2_MASK) ? IN_CD2_VS2H : 0;

		/* float VS1, drive VS2 low */
		val |= PCMCIA_C1_VS1OE_MASK;
		val &= ~PCMCIA_C1_VS2OE_MASK;
		pcmcia_writel(skt, val, PCMCIA_C1_REG);

		/* wait for output to stabilize and read CD[12] */
		udelay(10);
		val = pcmcia_readl(skt, PCMCIA_C1_REG);
		stat |= (val & PCMCIA_C1_CD1_MASK) ? IN_CD1_VS1H : 0;
		stat |= (val & PCMCIA_C1_CD2_MASK) ? IN_CD2_VS1H : 0;

		/* guess cardtype from all this */
		skt->card_type = vscd_to_cardtype[stat];
		if (!skt->card_type)
			dev_err(&skt->socket.dev, "unsupported card type\n");

		/* drive both VS pin to 0 again */
		val &= ~(PCMCIA_C1_VS1OE_MASK | PCMCIA_C1_VS2OE_MASK);

		/* enable correct logic */
		val &= ~(PCMCIA_C1_EN_PCMCIA_MASK | PCMCIA_C1_EN_CARDBUS_MASK);
		if (skt->card_type & CARD_PCCARD)
			val |= PCMCIA_C1_EN_PCMCIA_MASK;
		else
			val |= PCMCIA_C1_EN_CARDBUS_MASK;

		pcmcia_writel(skt, val, PCMCIA_C1_REG);
	}
	skt->card_detected = (stat & SS_DETECT) ? 1 : 0;

	/* report card type/voltage */
	if (skt->card_type & CARD_CARDBUS)
		stat |= SS_CARDBUS;
	if (skt->card_type & CARD_3V)
		stat |= SS_3VCARD;
	if (skt->card_type & CARD_XV)
		stat |= SS_XVCARD;
	stat |= SS_POWERON;

	if (gpio_get_value(skt->pd->ready_gpio))
		stat |= SS_READY;

	return stat;
}

/*
 * core request to get current socket status
 */
static int bcm63xx_pcmcia_get_status(struct pcmcia_socket *sock,
				     unsigned int *status)
{
	struct bcm63xx_pcmcia_socket *skt;

	skt = sock->driver_data;

	spin_lock_bh(&skt->lock);
	*status = __get_socket_status(skt);
	spin_unlock_bh(&skt->lock);

	return 0;
}

/*
 * socket polling timer callback
 */
static void bcm63xx_pcmcia_poll(struct timer_list *t)
{
	struct bcm63xx_pcmcia_socket *skt;
	unsigned int stat, events;

	skt = from_timer(skt, t, timer);

	spin_lock_bh(&skt->lock);

	stat = __get_socket_status(skt);

	/* keep only changed bits, and mask with required one from the
	 * core */
	events = (stat ^ skt->old_status) & skt->requested_state.csc_mask;
	skt->old_status = stat;
	spin_unlock_bh(&skt->lock);

	if (events)
		pcmcia_parse_events(&skt->socket, events);

	mod_timer(&skt->timer,
		  jiffies + msecs_to_jiffies(BCM63XX_PCMCIA_POLL_RATE));
}

static int bcm63xx_pcmcia_set_io_map(struct pcmcia_socket *sock,
				     struct pccard_io_map *map)
{
	/* this doesn't seem to be called by pcmcia layer if static
	 * mapping is used */
	return 0;
}

static int bcm63xx_pcmcia_set_mem_map(struct pcmcia_socket *sock,
				      struct pccard_mem_map *map)
{
	struct bcm63xx_pcmcia_socket *skt;
	struct resource *res;

	skt = sock->driver_data;
	if (map->flags & MAP_ATTRIB)
		res = skt->attr_res;
	else
		res = skt->common_res;

	map->static_start = res->start + map->card_start;
	return 0;
}

static struct pccard_operations bcm63xx_pcmcia_operations = {
	.init			= bcm63xx_pcmcia_sock_init,
	.suspend		= bcm63xx_pcmcia_suspend,
	.get_status		= bcm63xx_pcmcia_get_status,
	.set_socket		= bcm63xx_pcmcia_set_socket,
	.set_io_map		= bcm63xx_pcmcia_set_io_map,
	.set_mem_map		= bcm63xx_pcmcia_set_mem_map,
};

/*
 * register pcmcia socket to core
 */
static int bcm63xx_drv_pcmcia_probe(struct platform_device *pdev)
{
	struct bcm63xx_pcmcia_socket *skt;
	struct pcmcia_socket *sock;
	struct resource *res, *irq_res;
	unsigned int regmem_size = 0, iomem_size = 0;
	u32 val;
	int ret;

	skt = kzalloc(sizeof(*skt), GFP_KERNEL);
	if (!skt)
		return -ENOMEM;
	spin_lock_init(&skt->lock);
	sock = &skt->socket;
	sock->driver_data = skt;

	/* make sure we have all resources we need */
	skt->common_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	skt->attr_res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	skt->pd = pdev->dev.platform_data;
	if (!skt->common_res || !skt->attr_res || !irq_res || !skt->pd) {
		ret = -EINVAL;
		goto err;
	}

	/* remap pcmcia registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regmem_size = resource_size(res);
	if (!request_mem_region(res->start, regmem_size, "bcm63xx_pcmcia")) {
		ret = -EINVAL;
		goto err;
	}
	skt->reg_res = res;

	skt->base = ioremap(res->start, regmem_size);
	if (!skt->base) {
		ret = -ENOMEM;
		goto err;
	}

	/* remap io registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
	iomem_size = resource_size(res);
	skt->io_base = ioremap(res->start, iomem_size);
	if (!skt->io_base) {
		ret = -ENOMEM;
		goto err;
	}

	/* resources are static */
	sock->resource_ops = &pccard_static_ops;
	sock->ops = &bcm63xx_pcmcia_operations;
	sock->owner = THIS_MODULE;
	sock->dev.parent = &pdev->dev;
	sock->features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
	sock->io_offset = (unsigned long)skt->io_base;
	sock->pci_irq = irq_res->start;

#ifdef CONFIG_CARDBUS
	sock->cb_dev = bcm63xx_cb_dev;
	if (bcm63xx_cb_dev)
		sock->features |= SS_CAP_CARDBUS;
#endif

	/* assume common & attribute memory have the same size */
	sock->map_size = resource_size(skt->common_res);

	/* initialize polling timer */
	timer_setup(&skt->timer, bcm63xx_pcmcia_poll, 0);

	/* initialize  pcmcia  control register,  drive  VS[12] to  0,
	 * leave CB IDSEL to the old  value since it is set by the PCI
	 * layer */
	val = pcmcia_readl(skt, PCMCIA_C1_REG);
	val &= PCMCIA_C1_CBIDSEL_MASK;
	val |= PCMCIA_C1_EN_PCMCIA_GPIO_MASK;
	pcmcia_writel(skt, val, PCMCIA_C1_REG);

	/*
	 * Hardware has only one set of timings registers, not one for
	 * each memory access type, so we configure them for the
	 * slowest one: attribute memory.
	 */
	val = PCMCIA_C2_DATA16_MASK;
	val |= 10 << PCMCIA_C2_RWCOUNT_SHIFT;
	val |= 6 << PCMCIA_C2_INACTIVE_SHIFT;
	val |= 3 << PCMCIA_C2_SETUP_SHIFT;
	val |= 3 << PCMCIA_C2_HOLD_SHIFT;
	pcmcia_writel(skt, val, PCMCIA_C2_REG);

	ret = pcmcia_register_socket(sock);
	if (ret)
		goto err;

	/* start polling socket */
	mod_timer(&skt->timer,
		  jiffies + msecs_to_jiffies(BCM63XX_PCMCIA_POLL_RATE));

	platform_set_drvdata(pdev, skt);
	return 0;

err:
	if (skt->io_base)
		iounmap(skt->io_base);
	if (skt->base)
		iounmap(skt->base);
	if (skt->reg_res)
		release_mem_region(skt->reg_res->start, regmem_size);
	kfree(skt);
	return ret;
}

static int bcm63xx_drv_pcmcia_remove(struct platform_device *pdev)
{
	struct bcm63xx_pcmcia_socket *skt;
	struct resource *res;

	skt = platform_get_drvdata(pdev);
	del_timer_sync(&skt->timer);
	iounmap(skt->base);
	iounmap(skt->io_base);
	res = skt->reg_res;
	release_mem_region(res->start, resource_size(res));
	kfree(skt);
	return 0;
}

struct platform_driver bcm63xx_pcmcia_driver = {
	.probe	= bcm63xx_drv_pcmcia_probe,
	.remove	= bcm63xx_drv_pcmcia_remove,
	.driver	= {
		.name	= "bcm63xx_pcmcia",
		.owner  = THIS_MODULE,
	},
};

#ifdef CONFIG_CARDBUS
static int bcm63xx_cb_probe(struct pci_dev *dev,
				      const struct pci_device_id *id)
{
	/* keep pci device */
	bcm63xx_cb_dev = dev;
	return platform_driver_register(&bcm63xx_pcmcia_driver);
}

static void bcm63xx_cb_exit(struct pci_dev *dev)
{
	platform_driver_unregister(&bcm63xx_pcmcia_driver);
	bcm63xx_cb_dev = NULL;
}

static const struct pci_device_id bcm63xx_cb_table[] = {
	{
		.vendor		= PCI_VENDOR_ID_BROADCOM,
		.device		= BCM6348_CPU_ID,
		.subvendor	= PCI_VENDOR_ID_BROADCOM,
		.subdevice	= PCI_ANY_ID,
		.class		= PCI_CLASS_BRIDGE_CARDBUS << 8,
		.class_mask	= ~0,
	},

	{
		.vendor		= PCI_VENDOR_ID_BROADCOM,
		.device		= BCM6358_CPU_ID,
		.subvendor	= PCI_VENDOR_ID_BROADCOM,
		.subdevice	= PCI_ANY_ID,
		.class		= PCI_CLASS_BRIDGE_CARDBUS << 8,
		.class_mask	= ~0,
	},

	{ },
};

MODULE_DEVICE_TABLE(pci, bcm63xx_cb_table);

static struct pci_driver bcm63xx_cardbus_driver = {
	.name		= "bcm63xx_cardbus",
	.id_table	= bcm63xx_cb_table,
	.probe		= bcm63xx_cb_probe,
	.remove		= bcm63xx_cb_exit,
};
#endif

/*
 * if cardbus support is enabled, register our platform device after
 * our fake cardbus bridge has been registered
 */
static int __init bcm63xx_pcmcia_init(void)
{
#ifdef CONFIG_CARDBUS
	return pci_register_driver(&bcm63xx_cardbus_driver);
#else
	return platform_driver_register(&bcm63xx_pcmcia_driver);
#endif
}

static void __exit bcm63xx_pcmcia_exit(void)
{
#ifdef CONFIG_CARDBUS
	return pci_unregister_driver(&bcm63xx_cardbus_driver);
#else
	platform_driver_unregister(&bcm63xx_pcmcia_driver);
#endif
}

module_init(bcm63xx_pcmcia_init);
module_exit(bcm63xx_pcmcia_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
MODULE_DESCRIPTION("Linux PCMCIA Card Services: bcm63xx Socket Controller");