aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/powermac/pfunc_base.c
blob: 9b7150f104147f7de2bdce33da432321bd936c01 (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
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
#include <linux/config.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>

#include <asm/pmac_feature.h>
#include <asm/pmac_pfunc.h>

#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...)	printk(fmt)
#else
#define DBG(fmt...)
#endif

static irqreturn_t macio_gpio_irq(int irq, void *data, struct pt_regs *regs)
{
	pmf_do_irq(data);

	return IRQ_HANDLED;
}

static int macio_do_gpio_irq_enable(struct pmf_function *func)
{
	if (func->node->n_intrs < 1)
		return -EINVAL;

	return request_irq(func->node->intrs[0].line, macio_gpio_irq, 0,
			   func->node->name, func);
}

static int macio_do_gpio_irq_disable(struct pmf_function *func)
{
	if (func->node->n_intrs < 1)
		return -EINVAL;

	free_irq(func->node->intrs[0].line, func);
	return 0;
}

static int macio_do_gpio_write(PMF_STD_ARGS, u8 value, u8 mask)
{
	u8 __iomem *addr = (u8 __iomem *)func->driver_data;
	unsigned long flags;
	u8 tmp;

	/* Check polarity */
	if (args && args->count && !args->u[0].v)
		value = ~value;

	/* Toggle the GPIO */
	spin_lock_irqsave(&feature_lock, flags);
	tmp = readb(addr);
	tmp = (tmp & ~mask) | (value & mask);
	DBG("Do write 0x%02x to GPIO %s (%p)\n",
	    tmp, func->node->full_name, addr);
	writeb(tmp, addr);
	spin_unlock_irqrestore(&feature_lock, flags);

	return 0;
}

static int macio_do_gpio_read(PMF_STD_ARGS, u8 mask, int rshift, u8 xor)
{
	u8 __iomem *addr = (u8 __iomem *)func->driver_data;
	u32 value;

	/* Check if we have room for reply */
	if (args == NULL || args->count == 0 || args->u[0].p == NULL)
		return -EINVAL;

	value = readb(addr);
	*args->u[0].p = ((value & mask) >> rshift) ^ xor;

	return 0;
}

static int macio_do_delay(PMF_STD_ARGS, u32 duration)
{
	/* assume we can sleep ! */
	msleep((duration + 999) / 1000);
	return 0;
}

static struct pmf_handlers macio_gpio_handlers = {
	.irq_enable	= macio_do_gpio_irq_enable,
	.irq_disable	= macio_do_gpio_irq_disable,
	.write_gpio	= macio_do_gpio_write,
	.read_gpio	= macio_do_gpio_read,
	.delay		= macio_do_delay,
};

static void macio_gpio_init_one(struct macio_chip *macio)
{
	struct device_node *gparent, *gp;

	/*
	 * Find the "gpio" parent node
	 */

	for (gparent = NULL;
	     (gparent = of_get_next_child(macio->of_node, gparent)) != NULL;)
		if (strcmp(gparent->name, "gpio") == 0)
			break;
	if (gparent == NULL)
		return;

	DBG("Installing GPIO functions for macio %s\n",
	    macio->of_node->full_name);

	/*
	 * Ok, got one, we dont need anything special to track them down, so
	 * we just create them all
	 */
	for (gp = NULL; (gp = of_get_next_child(gparent, gp)) != NULL;) {
		u32 *reg = (u32 *)get_property(gp, "reg", NULL);
		unsigned long offset;
		if (reg == NULL)
			continue;
		offset = *reg;
		/* Deal with old style device-tree. We can safely hard code the
		 * offset for now too even if it's a bit gross ...
		 */
		if (offset < 0x50)
			offset += 0x50;
		offset += (unsigned long)macio->base;
		pmf_register_driver(gp, &macio_gpio_handlers, (void *)offset);
	}

	DBG("Calling initial GPIO functions for macio %s\n",
	    macio->of_node->full_name);

	/* And now we run all the init ones */
	for (gp = NULL; (gp = of_get_next_child(gparent, gp)) != NULL;)
		pmf_do_functions(gp, NULL, 0, PMF_FLAGS_ON_INIT, NULL);

	/* Note: We do not at this point implement the "at sleep" or "at wake"
	 * functions. I yet to find any for GPIOs anyway
	 */
}

static int macio_do_write_reg32(PMF_STD_ARGS, u32 offset, u32 value, u32 mask)
{
	struct macio_chip *macio = func->driver_data;
	unsigned long flags;

	spin_lock_irqsave(&feature_lock, flags);
	MACIO_OUT32(offset, (MACIO_IN32(offset) & ~mask) | (value & mask));
	spin_unlock_irqrestore(&feature_lock, flags);
	return 0;
}

static int macio_do_read_reg32(PMF_STD_ARGS, u32 offset)
{
	struct macio_chip *macio = func->driver_data;

	/* Check if we have room for reply */
	if (args == NULL || args->count == 0 || args->u[0].p == NULL)
		return -EINVAL;

	*args->u[0].p = MACIO_IN32(offset);
	return 0;
}

static int macio_do_write_reg8(PMF_STD_ARGS, u32 offset, u8 value, u8 mask)
{
	struct macio_chip *macio = func->driver_data;
	unsigned long flags;

	spin_lock_irqsave(&feature_lock, flags);
	MACIO_OUT8(offset, (MACIO_IN8(offset) & ~mask) | (value & mask));
	spin_unlock_irqrestore(&feature_lock, flags);
	return 0;
}

static int macio_do_read_reg8(PMF_STD_ARGS, u32 offset)
{
	struct macio_chip *macio = func->driver_data;

	/* Check if we have room for reply */
	if (args == NULL || args->count == 0 || args->u[0].p == NULL)
		return -EINVAL;

	*((u8 *)(args->u[0].p)) = MACIO_IN8(offset);
	return 0;
}

static int macio_do_read_reg32_msrx(PMF_STD_ARGS, u32 offset, u32 mask,
				    u32 shift, u32 xor)
{
	struct macio_chip *macio = func->driver_data;

	/* Check if we have room for reply */
	if (args == NULL || args->count == 0 || args->u[0].p == NULL)
		return -EINVAL;

	*args->u[0].p = ((MACIO_IN32(offset) & mask) >> shift) ^ xor;
	return 0;
}

static int macio_do_read_reg8_msrx(PMF_STD_ARGS, u32 offset, u32 mask,
				   u32 shift, u32 xor)
{
	struct macio_chip *macio = func->driver_data;

	/* Check if we have room for reply */
	if (args == NULL || args->count == 0 || args->u[0].p == NULL)
		return -EINVAL;

	*((u8 *)(args->u[0].p)) = ((MACIO_IN8(offset) & mask) >> shift) ^ xor;
	return 0;
}

static int macio_do_write_reg32_slm(PMF_STD_ARGS, u32 offset, u32 shift,
				    u32 mask)
{
	struct macio_chip *macio = func->driver_data;
	unsigned long flags;
	u32 tmp, val;

	/* Check args */
	if (args == NULL || args->count == 0)
		return -EINVAL;

	spin_lock_irqsave(&feature_lock, flags);
	tmp = MACIO_IN32(offset);
	val = args->u[0].v << shift;
	tmp = (tmp & ~mask) | (val & mask);
	MACIO_OUT32(offset, tmp);
	spin_unlock_irqrestore(&feature_lock, flags);
	return 0;
}

static int macio_do_write_reg8_slm(PMF_STD_ARGS, u32 offset, u32 shift,
				   u32 mask)
{
	struct macio_chip *macio = func->driver_data;
	unsigned long flags;
	u32 tmp, val;

	/* Check args */
	if (args == NULL || args->count == 0)
		return -EINVAL;

	spin_lock_irqsave(&feature_lock, flags);
	tmp = MACIO_IN8(offset);
	val = args->u[0].v << shift;
	tmp = (tmp & ~mask) | (val & mask);
	MACIO_OUT8(offset, tmp);
	spin_unlock_irqrestore(&feature_lock, flags);
	return 0;
}

static struct pmf_handlers macio_mmio_handlers = {
	.write_reg32		= macio_do_write_reg32,
	.read_reg32		= macio_do_read_reg32,
	.write_reg8		= macio_do_write_reg8,
	.read_reg32		= macio_do_read_reg8,
	.read_reg32_msrx	= macio_do_read_reg32_msrx,
	.read_reg8_msrx		= macio_do_read_reg8_msrx,
	.write_reg32_slm	= macio_do_write_reg32_slm,
	.write_reg8_slm		= macio_do_write_reg8_slm,
	.delay			= macio_do_delay,
};

static void macio_mmio_init_one(struct macio_chip *macio)
{
	DBG("Installing MMIO functions for macio %s\n",
	    macio->of_node->full_name);

	pmf_register_driver(macio->of_node, &macio_mmio_handlers, macio);
}

static struct device_node *unin_hwclock;

static int unin_do_write_reg32(PMF_STD_ARGS, u32 offset, u32 value, u32 mask)
{
	unsigned long flags;

	spin_lock_irqsave(&feature_lock, flags);
	/* This is fairly bogus in darwin, but it should work for our needs
	 * implemeted that way:
	 */
	UN_OUT(offset, (UN_IN(offset) & ~mask) | (value & mask));
	spin_unlock_irqrestore(&feature_lock, flags);
	return 0;
}


static struct pmf_handlers unin_mmio_handlers = {
	.write_reg32		= unin_do_write_reg32,
	.delay			= macio_do_delay,
};

static void uninorth_install_pfunc(void)
{
	struct device_node *np;

	DBG("Installing functions for UniN %s\n",
	    uninorth_node->full_name);

	/*
	 * Install handlers for the bridge itself
	 */
	pmf_register_driver(uninorth_node, &unin_mmio_handlers, NULL);
	pmf_do_functions(uninorth_node, NULL, 0, PMF_FLAGS_ON_INIT, NULL);


	/*
	 * Install handlers for the hwclock child if any
	 */
	for (np = NULL; (np = of_get_next_child(uninorth_node, np)) != NULL;)
		if (strcmp(np->name, "hw-clock") == 0) {
			unin_hwclock = np;
			break;
		}
	if (unin_hwclock) {
		DBG("Installing functions for UniN clock %s\n",
		    unin_hwclock->full_name);
		pmf_register_driver(unin_hwclock, &unin_mmio_handlers, NULL);
		pmf_do_functions(unin_hwclock, NULL, 0, PMF_FLAGS_ON_INIT,
				 NULL);
	}
}

/* We export this as the SMP code might init us early */
int __init pmac_pfunc_base_install(void)
{
	static int pfbase_inited;
	int i;

	if (pfbase_inited)
		return 0;
	pfbase_inited = 1;


	DBG("Installing base platform functions...\n");

	/*
	 * Locate mac-io chips and install handlers
	 */
	for (i = 0 ; i < MAX_MACIO_CHIPS; i++) {
		if (macio_chips[i].of_node) {
			macio_mmio_init_one(&macio_chips[i]);
			macio_gpio_init_one(&macio_chips[i]);
		}
	}

	/*
	 * Install handlers for northbridge and direct mapped hwclock
	 * if any. We do not implement the config space access callback
	 * which is only ever used for functions that we do not call in
	 * the current driver (enabling/disabling cells in U2, mostly used
	 * to restore the PCI settings, we do that differently)
	 */
	if (uninorth_node && uninorth_base)
		uninorth_install_pfunc();

	DBG("All base functions installed\n");

	return 0;
}

arch_initcall(pmac_pfunc_base_install);

#ifdef CONFIG_PM

/* Those can be called by pmac_feature. Ultimately, I should use a sysdev
 * or a device, but for now, that's good enough until I sort out some
 * ordering issues. Also, we do not bother with GPIOs, as so far I yet have
 * to see a case where a GPIO function has the on-suspend or on-resume bit
 */
void pmac_pfunc_base_suspend(void)
{
	int i;

	for (i = 0 ; i < MAX_MACIO_CHIPS; i++) {
		if (macio_chips[i].of_node)
			pmf_do_functions(macio_chips[i].of_node, NULL, 0,
					 PMF_FLAGS_ON_SLEEP, NULL);
	}
	if (uninorth_node)
		pmf_do_functions(uninorth_node, NULL, 0,
				 PMF_FLAGS_ON_SLEEP, NULL);
	if (unin_hwclock)
		pmf_do_functions(unin_hwclock, NULL, 0,
				 PMF_FLAGS_ON_SLEEP, NULL);
}

void pmac_pfunc_base_resume(void)
{
	int i;

	if (unin_hwclock)
		pmf_do_functions(unin_hwclock, NULL, 0,
				 PMF_FLAGS_ON_WAKE, NULL);
	if (uninorth_node)
		pmf_do_functions(uninorth_node, NULL, 0,
				 PMF_FLAGS_ON_WAKE, NULL);
	for (i = 0 ; i < MAX_MACIO_CHIPS; i++) {
		if (macio_chips[i].of_node)
			pmf_do_functions(macio_chips[i].of_node, NULL, 0,
					 PMF_FLAGS_ON_WAKE, NULL);
	}
}

#endif /* CONFIG_PM */