xref: /openbmc/linux/drivers/macintosh/via-pmu.c (revision 93cfa6fb)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Device driver for the PMU in Apple PowerBooks and PowerMacs.
4  *
5  * The VIA (versatile interface adapter) interfaces to the PMU,
6  * a 6805 microprocessor core whose primary function is to control
7  * battery charging and system power on the PowerBook 3400 and 2400.
8  * The PMU also controls the ADB (Apple Desktop Bus) which connects
9  * to the keyboard and mouse, as well as the non-volatile RAM
10  * and the RTC (real time clock) chip.
11  *
12  * Copyright (C) 1998 Paul Mackerras and Fabio Riccardi.
13  * Copyright (C) 2001-2002 Benjamin Herrenschmidt
14  * Copyright (C) 2006-2007 Johannes Berg
15  *
16  * THIS DRIVER IS BECOMING A TOTAL MESS !
17  *  - Cleanup atomically disabling reply to PMU events after
18  *    a sleep or a freq. switch
19  *
20  */
21 #include <linux/stdarg.h>
22 #include <linux/mutex.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <linux/miscdevice.h>
29 #include <linux/blkdev.h>
30 #include <linux/pci.h>
31 #include <linux/slab.h>
32 #include <linux/poll.h>
33 #include <linux/adb.h>
34 #include <linux/pmu.h>
35 #include <linux/cuda.h>
36 #include <linux/module.h>
37 #include <linux/spinlock.h>
38 #include <linux/pm.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <linux/init.h>
42 #include <linux/interrupt.h>
43 #include <linux/device.h>
44 #include <linux/syscore_ops.h>
45 #include <linux/freezer.h>
46 #include <linux/syscalls.h>
47 #include <linux/suspend.h>
48 #include <linux/cpu.h>
49 #include <linux/compat.h>
50 #include <linux/of_address.h>
51 #include <linux/of_irq.h>
52 #include <linux/uaccess.h>
53 #include <linux/pgtable.h>
54 #include <asm/machdep.h>
55 #include <asm/io.h>
56 #include <asm/sections.h>
57 #include <asm/irq.h>
58 #ifdef CONFIG_PPC_PMAC
59 #include <asm/pmac_feature.h>
60 #include <asm/pmac_pfunc.h>
61 #include <asm/pmac_low_i2c.h>
62 #include <asm/mmu_context.h>
63 #include <asm/cputable.h>
64 #include <asm/time.h>
65 #include <asm/backlight.h>
66 #else
67 #include <asm/macintosh.h>
68 #include <asm/macints.h>
69 #include <asm/mac_via.h>
70 #endif
71 
72 #include "via-pmu-event.h"
73 
74 /* Some compile options */
75 #undef DEBUG_SLEEP
76 
77 /* How many iterations between battery polls */
78 #define BATTERY_POLLING_COUNT	2
79 
80 static DEFINE_MUTEX(pmu_info_proc_mutex);
81 
82 /* VIA registers - spaced 0x200 bytes apart */
83 #define RS		0x200		/* skip between registers */
84 #define B		0		/* B-side data */
85 #define A		RS		/* A-side data */
86 #define DIRB		(2*RS)		/* B-side direction (1=output) */
87 #define DIRA		(3*RS)		/* A-side direction (1=output) */
88 #define T1CL		(4*RS)		/* Timer 1 ctr/latch (low 8 bits) */
89 #define T1CH		(5*RS)		/* Timer 1 counter (high 8 bits) */
90 #define T1LL		(6*RS)		/* Timer 1 latch (low 8 bits) */
91 #define T1LH		(7*RS)		/* Timer 1 latch (high 8 bits) */
92 #define T2CL		(8*RS)		/* Timer 2 ctr/latch (low 8 bits) */
93 #define T2CH		(9*RS)		/* Timer 2 counter (high 8 bits) */
94 #define SR		(10*RS)		/* Shift register */
95 #define ACR		(11*RS)		/* Auxiliary control register */
96 #define PCR		(12*RS)		/* Peripheral control register */
97 #define IFR		(13*RS)		/* Interrupt flag register */
98 #define IER		(14*RS)		/* Interrupt enable register */
99 #define ANH		(15*RS)		/* A-side data, no handshake */
100 
101 /* Bits in B data register: both active low */
102 #ifdef CONFIG_PPC_PMAC
103 #define TACK		0x08		/* Transfer acknowledge (input) */
104 #define TREQ		0x10		/* Transfer request (output) */
105 #else
106 #define TACK		0x02
107 #define TREQ		0x04
108 #endif
109 
110 /* Bits in ACR */
111 #define SR_CTRL		0x1c		/* Shift register control bits */
112 #define SR_EXT		0x0c		/* Shift on external clock */
113 #define SR_OUT		0x10		/* Shift out if 1 */
114 
115 /* Bits in IFR and IER */
116 #define IER_SET		0x80		/* set bits in IER */
117 #define IER_CLR		0		/* clear bits in IER */
118 #define SR_INT		0x04		/* Shift register full/empty */
119 #define CB2_INT		0x08
120 #define CB1_INT		0x10		/* transition on CB1 input */
121 
122 static volatile enum pmu_state {
123 	uninitialized = 0,
124 	idle,
125 	sending,
126 	intack,
127 	reading,
128 	reading_intr,
129 	locked,
130 } pmu_state;
131 
132 static volatile enum int_data_state {
133 	int_data_empty,
134 	int_data_fill,
135 	int_data_ready,
136 	int_data_flush
137 } int_data_state[2] = { int_data_empty, int_data_empty };
138 
139 static struct adb_request *current_req;
140 static struct adb_request *last_req;
141 static struct adb_request *req_awaiting_reply;
142 static unsigned char interrupt_data[2][32];
143 static int interrupt_data_len[2];
144 static int int_data_last;
145 static unsigned char *reply_ptr;
146 static int data_index;
147 static int data_len;
148 static volatile int adb_int_pending;
149 static volatile int disable_poll;
150 static int pmu_kind = PMU_UNKNOWN;
151 static int pmu_fully_inited;
152 static int pmu_has_adb;
153 #ifdef CONFIG_PPC_PMAC
154 static volatile unsigned char __iomem *via1;
155 static volatile unsigned char __iomem *via2;
156 static struct device_node *vias;
157 static struct device_node *gpio_node;
158 #endif
159 static unsigned char __iomem *gpio_reg;
160 static int gpio_irq = 0;
161 static int gpio_irq_enabled = -1;
162 static volatile int pmu_suspended;
163 static DEFINE_SPINLOCK(pmu_lock);
164 static u8 pmu_intr_mask;
165 static int pmu_version;
166 static int drop_interrupts;
167 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
168 static int option_lid_wakeup = 1;
169 #endif /* CONFIG_SUSPEND && CONFIG_PPC32 */
170 static unsigned long async_req_locks;
171 
172 #define NUM_IRQ_STATS 13
173 static unsigned int pmu_irq_stats[NUM_IRQ_STATS];
174 
175 static struct proc_dir_entry *proc_pmu_root;
176 static struct proc_dir_entry *proc_pmu_info;
177 static struct proc_dir_entry *proc_pmu_irqstats;
178 static struct proc_dir_entry *proc_pmu_options;
179 static int option_server_mode;
180 
181 int pmu_battery_count;
182 static int pmu_cur_battery;
183 unsigned int pmu_power_flags = PMU_PWR_AC_PRESENT;
184 struct pmu_battery_info pmu_batteries[PMU_MAX_BATTERIES];
185 static int query_batt_timer = BATTERY_POLLING_COUNT;
186 static struct adb_request batt_req;
187 static struct proc_dir_entry *proc_pmu_batt[PMU_MAX_BATTERIES];
188 
189 int asleep;
190 
191 #ifdef CONFIG_ADB
192 static int adb_dev_map;
193 static int pmu_adb_flags;
194 
195 static int pmu_probe(void);
196 static int pmu_init(void);
197 static int pmu_send_request(struct adb_request *req, int sync);
198 static int pmu_adb_autopoll(int devs);
199 static int pmu_adb_reset_bus(void);
200 #endif /* CONFIG_ADB */
201 
202 static int init_pmu(void);
203 static void pmu_start(void);
204 static irqreturn_t via_pmu_interrupt(int irq, void *arg);
205 static irqreturn_t gpio1_interrupt(int irq, void *arg);
206 #ifdef CONFIG_PROC_FS
207 static int pmu_info_proc_show(struct seq_file *m, void *v);
208 static int pmu_irqstats_proc_show(struct seq_file *m, void *v);
209 static int pmu_battery_proc_show(struct seq_file *m, void *v);
210 #endif
211 static void pmu_pass_intr(unsigned char *data, int len);
212 static const struct proc_ops pmu_options_proc_ops;
213 
214 #ifdef CONFIG_ADB
215 const struct adb_driver via_pmu_driver = {
216 	.name         = "PMU",
217 	.probe        = pmu_probe,
218 	.init         = pmu_init,
219 	.send_request = pmu_send_request,
220 	.autopoll     = pmu_adb_autopoll,
221 	.poll         = pmu_poll_adb,
222 	.reset_bus    = pmu_adb_reset_bus,
223 };
224 #endif /* CONFIG_ADB */
225 
226 extern void low_sleep_handler(void);
227 extern void enable_kernel_altivec(void);
228 extern void enable_kernel_fp(void);
229 
230 #ifdef DEBUG_SLEEP
231 int pmu_polled_request(struct adb_request *req);
232 void pmu_blink(int n);
233 #endif
234 
235 /*
236  * This table indicates for each PMU opcode:
237  * - the number of data bytes to be sent with the command, or -1
238  *   if a length byte should be sent,
239  * - the number of response bytes which the PMU will return, or
240  *   -1 if it will send a length byte.
241  */
242 static const s8 pmu_data_len[256][2] = {
243 /*	   0	   1	   2	   3	   4	   5	   6	   7  */
244 /*00*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
245 /*08*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
246 /*10*/	{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
247 /*18*/	{ 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
248 /*20*/	{-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
249 /*28*/	{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
250 /*30*/	{ 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
251 /*38*/	{ 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
252 /*40*/	{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
253 /*48*/	{ 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
254 /*50*/	{ 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
255 /*58*/	{ 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
256 /*60*/	{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
257 /*68*/	{ 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
258 /*70*/	{ 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
259 /*78*/	{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
260 /*80*/	{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
261 /*88*/	{ 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
262 /*90*/	{ 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
263 /*98*/	{ 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
264 /*a0*/	{ 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
265 /*a8*/	{ 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
266 /*b0*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
267 /*b8*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
268 /*c0*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
269 /*c8*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
270 /*d0*/	{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
271 /*d8*/	{ 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
272 /*e0*/	{-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
273 /*e8*/	{ 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
274 /*f0*/	{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
275 /*f8*/	{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
276 };
277 
278 static char *pbook_type[] = {
279 	"Unknown PowerBook",
280 	"PowerBook 2400/3400/3500(G3)",
281 	"PowerBook G3 Series",
282 	"1999 PowerBook G3",
283 	"Core99"
284 };
285 
find_via_pmu(void)286 int __init find_via_pmu(void)
287 {
288 #ifdef CONFIG_PPC_PMAC
289 	int err;
290 	u64 taddr;
291 	struct resource res;
292 
293 	if (pmu_state != uninitialized)
294 		return 1;
295 	vias = of_find_node_by_name(NULL, "via-pmu");
296 	if (vias == NULL)
297 		return 0;
298 
299 	err = of_address_to_resource(vias, 0, &res);
300 	if (err) {
301 		printk(KERN_ERR "via-pmu: Error getting \"reg\" property !\n");
302 		goto fail;
303 	}
304 	taddr = res.start;
305 
306 	pmu_has_adb = 1;
307 
308 	pmu_intr_mask =	PMU_INT_PCEJECT |
309 			PMU_INT_SNDBRT |
310 			PMU_INT_ADB |
311 			PMU_INT_TICK;
312 
313 	if (of_node_name_eq(vias->parent, "ohare") ||
314 	    of_device_is_compatible(vias->parent, "ohare"))
315 		pmu_kind = PMU_OHARE_BASED;
316 	else if (of_device_is_compatible(vias->parent, "paddington"))
317 		pmu_kind = PMU_PADDINGTON_BASED;
318 	else if (of_device_is_compatible(vias->parent, "heathrow"))
319 		pmu_kind = PMU_HEATHROW_BASED;
320 	else if (of_device_is_compatible(vias->parent, "Keylargo")
321 		 || of_device_is_compatible(vias->parent, "K2-Keylargo")) {
322 		struct device_node *gpiop;
323 		struct device_node *adbp;
324 
325 		pmu_kind = PMU_KEYLARGO_BASED;
326 		adbp = of_find_node_by_type(NULL, "adb");
327 		pmu_has_adb = (adbp != NULL);
328 		of_node_put(adbp);
329 		pmu_intr_mask =	PMU_INT_PCEJECT |
330 				PMU_INT_SNDBRT |
331 				PMU_INT_ADB |
332 				PMU_INT_TICK |
333 				PMU_INT_ENVIRONMENT;
334 
335 		gpiop = of_find_node_by_name(NULL, "gpio");
336 		if (gpiop) {
337 			if (!of_address_to_resource(gpiop, 0, &res))
338 				gpio_reg = ioremap(res.start, 0x10);
339 			of_node_put(gpiop);
340 		}
341 		if (gpio_reg == NULL) {
342 			printk(KERN_ERR "via-pmu: Can't find GPIO reg !\n");
343 			goto fail;
344 		}
345 	} else
346 		pmu_kind = PMU_UNKNOWN;
347 
348 	via1 = via2 = ioremap(taddr, 0x2000);
349 	if (via1 == NULL) {
350 		printk(KERN_ERR "via-pmu: Can't map address !\n");
351 		goto fail_via_remap;
352 	}
353 
354 	out_8(&via1[IER], IER_CLR | 0x7f);	/* disable all intrs */
355 	out_8(&via1[IFR], 0x7f);			/* clear IFR */
356 
357 	pmu_state = idle;
358 
359 	if (!init_pmu())
360 		goto fail_init;
361 
362 	sys_ctrler = SYS_CTRLER_PMU;
363 
364 	return 1;
365 
366  fail_init:
367 	iounmap(via1);
368 	via1 = via2 = NULL;
369  fail_via_remap:
370 	iounmap(gpio_reg);
371 	gpio_reg = NULL;
372  fail:
373 	of_node_put(vias);
374 	vias = NULL;
375 	pmu_state = uninitialized;
376 	return 0;
377 #else
378 	if (macintosh_config->adb_type != MAC_ADB_PB2)
379 		return 0;
380 
381 	pmu_kind = PMU_UNKNOWN;
382 
383 	pmu_has_adb = 1;
384 
385 	pmu_intr_mask =	PMU_INT_PCEJECT |
386 			PMU_INT_SNDBRT |
387 			PMU_INT_ADB |
388 			PMU_INT_TICK;
389 
390 	pmu_state = idle;
391 
392 	if (!init_pmu()) {
393 		pmu_state = uninitialized;
394 		return 0;
395 	}
396 
397 	return 1;
398 #endif /* !CONFIG_PPC_PMAC */
399 }
400 
401 #ifdef CONFIG_ADB
pmu_probe(void)402 static int pmu_probe(void)
403 {
404 	return pmu_state == uninitialized ? -ENODEV : 0;
405 }
406 
pmu_init(void)407 static int pmu_init(void)
408 {
409 	return pmu_state == uninitialized ? -ENODEV : 0;
410 }
411 #endif /* CONFIG_ADB */
412 
413 /*
414  * We can't wait until pmu_init gets called, that happens too late.
415  * It happens after IDE and SCSI initialization, which can take a few
416  * seconds, and by that time the PMU could have given up on us and
417  * turned us off.
418  * Thus this is called with arch_initcall rather than device_initcall.
419  */
via_pmu_start(void)420 static int __init via_pmu_start(void)
421 {
422 	unsigned int __maybe_unused irq;
423 
424 	if (pmu_state == uninitialized)
425 		return -ENODEV;
426 
427 	batt_req.complete = 1;
428 
429 #ifdef CONFIG_PPC_PMAC
430 	irq = irq_of_parse_and_map(vias, 0);
431 	if (!irq) {
432 		printk(KERN_ERR "via-pmu: can't map interrupt\n");
433 		return -ENODEV;
434 	}
435 	/* We set IRQF_NO_SUSPEND because we don't want the interrupt
436 	 * to be disabled between the 2 passes of driver suspend, we
437 	 * control our own disabling for that one
438 	 */
439 	if (request_irq(irq, via_pmu_interrupt, IRQF_NO_SUSPEND,
440 			"VIA-PMU", (void *)0)) {
441 		printk(KERN_ERR "via-pmu: can't request irq %d\n", irq);
442 		return -ENODEV;
443 	}
444 
445 	if (pmu_kind == PMU_KEYLARGO_BASED) {
446 		gpio_node = of_find_node_by_name(NULL, "extint-gpio1");
447 		if (gpio_node == NULL)
448 			gpio_node = of_find_node_by_name(NULL,
449 							 "pmu-interrupt");
450 		if (gpio_node)
451 			gpio_irq = irq_of_parse_and_map(gpio_node, 0);
452 
453 		if (gpio_irq) {
454 			if (request_irq(gpio_irq, gpio1_interrupt,
455 					IRQF_NO_SUSPEND, "GPIO1 ADB",
456 					(void *)0))
457 				printk(KERN_ERR "pmu: can't get irq %d"
458 				       " (GPIO1)\n", gpio_irq);
459 			else
460 				gpio_irq_enabled = 1;
461 		}
462 	}
463 
464 	/* Enable interrupts */
465 	out_8(&via1[IER], IER_SET | SR_INT | CB1_INT);
466 #else
467 	if (request_irq(IRQ_MAC_ADB_SR, via_pmu_interrupt, IRQF_NO_SUSPEND,
468 			"VIA-PMU-SR", NULL)) {
469 		pr_err("%s: couldn't get SR irq\n", __func__);
470 		return -ENODEV;
471 	}
472 	if (request_irq(IRQ_MAC_ADB_CL, via_pmu_interrupt, IRQF_NO_SUSPEND,
473 			"VIA-PMU-CL", NULL)) {
474 		pr_err("%s: couldn't get CL irq\n", __func__);
475 		free_irq(IRQ_MAC_ADB_SR, NULL);
476 		return -ENODEV;
477 	}
478 #endif /* !CONFIG_PPC_PMAC */
479 
480 	pmu_fully_inited = 1;
481 
482 	/* Make sure PMU settle down before continuing. This is _very_ important
483 	 * since the IDE probe may shut interrupts down for quite a bit of time. If
484 	 * a PMU communication is pending while this happens, the PMU may timeout
485 	 * Not that on Core99 machines, the PMU keeps sending us environement
486 	 * messages, we should find a way to either fix IDE or make it call
487 	 * pmu_suspend() before masking interrupts. This can also happens while
488 	 * scolling with some fbdevs.
489 	 */
490 	do {
491 		pmu_poll();
492 	} while (pmu_state != idle);
493 
494 	return 0;
495 }
496 
497 arch_initcall(via_pmu_start);
498 
499 /*
500  * This has to be done after pci_init, which is a subsys_initcall.
501  */
via_pmu_dev_init(void)502 static int __init via_pmu_dev_init(void)
503 {
504 	if (pmu_state == uninitialized)
505 		return -ENODEV;
506 
507 #ifdef CONFIG_PMAC_BACKLIGHT
508 	/* Initialize backlight */
509 	pmu_backlight_init();
510 #endif
511 
512 #ifdef CONFIG_PPC32
513   	if (of_machine_is_compatible("AAPL,3400/2400") ||
514   		of_machine_is_compatible("AAPL,3500")) {
515 		int mb = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
516 			NULL, PMAC_MB_INFO_MODEL, 0);
517 		pmu_battery_count = 1;
518 		if (mb == PMAC_TYPE_COMET)
519 			pmu_batteries[0].flags |= PMU_BATT_TYPE_COMET;
520 		else
521 			pmu_batteries[0].flags |= PMU_BATT_TYPE_HOOPER;
522 	} else if (of_machine_is_compatible("AAPL,PowerBook1998") ||
523 		of_machine_is_compatible("PowerBook1,1")) {
524 		pmu_battery_count = 2;
525 		pmu_batteries[0].flags |= PMU_BATT_TYPE_SMART;
526 		pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
527 	} else {
528 		struct device_node* prim =
529 			of_find_node_by_name(NULL, "power-mgt");
530 		const u32 *prim_info = NULL;
531 		if (prim)
532 			prim_info = of_get_property(prim, "prim-info", NULL);
533 		if (prim_info) {
534 			/* Other stuffs here yet unknown */
535 			pmu_battery_count = (prim_info[6] >> 16) & 0xff;
536 			pmu_batteries[0].flags |= PMU_BATT_TYPE_SMART;
537 			if (pmu_battery_count > 1)
538 				pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
539 		}
540 		of_node_put(prim);
541 	}
542 #endif /* CONFIG_PPC32 */
543 
544 	/* Create /proc/pmu */
545 	proc_pmu_root = proc_mkdir("pmu", NULL);
546 	if (proc_pmu_root) {
547 		long i;
548 
549 		for (i=0; i<pmu_battery_count; i++) {
550 			char title[16];
551 			sprintf(title, "battery_%ld", i);
552 			proc_pmu_batt[i] = proc_create_single_data(title, 0,
553 					proc_pmu_root, pmu_battery_proc_show,
554 					(void *)i);
555 		}
556 
557 		proc_pmu_info = proc_create_single("info", 0, proc_pmu_root,
558 				pmu_info_proc_show);
559 		proc_pmu_irqstats = proc_create_single("interrupts", 0,
560 				proc_pmu_root, pmu_irqstats_proc_show);
561 		proc_pmu_options = proc_create("options", 0600, proc_pmu_root,
562 						&pmu_options_proc_ops);
563 	}
564 	return 0;
565 }
566 
567 device_initcall(via_pmu_dev_init);
568 
569 static int
init_pmu(void)570 init_pmu(void)
571 {
572 	int timeout;
573 	struct adb_request req;
574 
575 	/* Negate TREQ. Set TACK to input and TREQ to output. */
576 	out_8(&via2[B], in_8(&via2[B]) | TREQ);
577 	out_8(&via2[DIRB], (in_8(&via2[DIRB]) | TREQ) & ~TACK);
578 
579 	pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
580 	timeout =  100000;
581 	while (!req.complete) {
582 		if (--timeout < 0) {
583 			printk(KERN_ERR "init_pmu: no response from PMU\n");
584 			return 0;
585 		}
586 		udelay(10);
587 		pmu_poll();
588 	}
589 
590 	/* ack all pending interrupts */
591 	timeout = 100000;
592 	interrupt_data[0][0] = 1;
593 	while (interrupt_data[0][0] || pmu_state != idle) {
594 		if (--timeout < 0) {
595 			printk(KERN_ERR "init_pmu: timed out acking intrs\n");
596 			return 0;
597 		}
598 		if (pmu_state == idle)
599 			adb_int_pending = 1;
600 		via_pmu_interrupt(0, NULL);
601 		udelay(10);
602 	}
603 
604 	/* Tell PMU we are ready.  */
605 	if (pmu_kind == PMU_KEYLARGO_BASED) {
606 		pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
607 		while (!req.complete)
608 			pmu_poll();
609 	}
610 
611 	/* Read PMU version */
612 	pmu_request(&req, NULL, 1, PMU_GET_VERSION);
613 	pmu_wait_complete(&req);
614 	if (req.reply_len > 0)
615 		pmu_version = req.reply[0];
616 
617 	/* Read server mode setting */
618 	if (pmu_kind == PMU_KEYLARGO_BASED) {
619 		pmu_request(&req, NULL, 2, PMU_POWER_EVENTS,
620 			    PMU_PWR_GET_POWERUP_EVENTS);
621 		pmu_wait_complete(&req);
622 		if (req.reply_len == 2) {
623 			if (req.reply[1] & PMU_PWR_WAKEUP_AC_INSERT)
624 				option_server_mode = 1;
625 			printk(KERN_INFO "via-pmu: Server Mode is %s\n",
626 			       option_server_mode ? "enabled" : "disabled");
627 		}
628 	}
629 
630 	printk(KERN_INFO "PMU driver v%d initialized for %s, firmware: %02x\n",
631 	       PMU_DRIVER_VERSION, pbook_type[pmu_kind], pmu_version);
632 
633 	return 1;
634 }
635 
636 int
pmu_get_model(void)637 pmu_get_model(void)
638 {
639 	return pmu_kind;
640 }
641 
pmu_set_server_mode(int server_mode)642 static void pmu_set_server_mode(int server_mode)
643 {
644 	struct adb_request req;
645 
646 	if (pmu_kind != PMU_KEYLARGO_BASED)
647 		return;
648 
649 	option_server_mode = server_mode;
650 	pmu_request(&req, NULL, 2, PMU_POWER_EVENTS, PMU_PWR_GET_POWERUP_EVENTS);
651 	pmu_wait_complete(&req);
652 	if (req.reply_len < 2)
653 		return;
654 	if (server_mode)
655 		pmu_request(&req, NULL, 4, PMU_POWER_EVENTS,
656 			    PMU_PWR_SET_POWERUP_EVENTS,
657 			    req.reply[0], PMU_PWR_WAKEUP_AC_INSERT);
658 	else
659 		pmu_request(&req, NULL, 4, PMU_POWER_EVENTS,
660 			    PMU_PWR_CLR_POWERUP_EVENTS,
661 			    req.reply[0], PMU_PWR_WAKEUP_AC_INSERT);
662 	pmu_wait_complete(&req);
663 }
664 
665 /* This new version of the code for 2400/3400/3500 powerbooks
666  * is inspired from the implementation in gkrellm-pmu
667  */
668 static void
done_battery_state_ohare(struct adb_request * req)669 done_battery_state_ohare(struct adb_request* req)
670 {
671 #ifdef CONFIG_PPC_PMAC
672 	/* format:
673 	 *  [0]    :  flags
674 	 *    0x01 :  AC indicator
675 	 *    0x02 :  charging
676 	 *    0x04 :  battery exist
677 	 *    0x08 :
678 	 *    0x10 :
679 	 *    0x20 :  full charged
680 	 *    0x40 :  pcharge reset
681 	 *    0x80 :  battery exist
682 	 *
683 	 *  [1][2] :  battery voltage
684 	 *  [3]    :  CPU temperature
685 	 *  [4]    :  battery temperature
686 	 *  [5]    :  current
687 	 *  [6][7] :  pcharge
688 	 *              --tkoba
689 	 */
690 	unsigned int bat_flags = PMU_BATT_TYPE_HOOPER;
691 	long pcharge, charge, vb, vmax, lmax;
692 	long vmax_charging, vmax_charged;
693 	long amperage, voltage, time, max;
694 	int mb = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
695 			NULL, PMAC_MB_INFO_MODEL, 0);
696 
697 	if (req->reply[0] & 0x01)
698 		pmu_power_flags |= PMU_PWR_AC_PRESENT;
699 	else
700 		pmu_power_flags &= ~PMU_PWR_AC_PRESENT;
701 
702 	if (mb == PMAC_TYPE_COMET) {
703 		vmax_charged = 189;
704 		vmax_charging = 213;
705 		lmax = 6500;
706 	} else {
707 		vmax_charged = 330;
708 		vmax_charging = 330;
709 		lmax = 6500;
710 	}
711 	vmax = vmax_charged;
712 
713 	/* If battery installed */
714 	if (req->reply[0] & 0x04) {
715 		bat_flags |= PMU_BATT_PRESENT;
716 		if (req->reply[0] & 0x02)
717 			bat_flags |= PMU_BATT_CHARGING;
718 		vb = (req->reply[1] << 8) | req->reply[2];
719 		voltage = (vb * 265 + 72665) / 10;
720 		amperage = req->reply[5];
721 		if ((req->reply[0] & 0x01) == 0) {
722 			if (amperage > 200)
723 				vb += ((amperage - 200) * 15)/100;
724 		} else if (req->reply[0] & 0x02) {
725 			vb = (vb * 97) / 100;
726 			vmax = vmax_charging;
727 		}
728 		charge = (100 * vb) / vmax;
729 		if (req->reply[0] & 0x40) {
730 			pcharge = (req->reply[6] << 8) + req->reply[7];
731 			if (pcharge > lmax)
732 				pcharge = lmax;
733 			pcharge *= 100;
734 			pcharge = 100 - pcharge / lmax;
735 			if (pcharge < charge)
736 				charge = pcharge;
737 		}
738 		if (amperage > 0)
739 			time = (charge * 16440) / amperage;
740 		else
741 			time = 0;
742 		max = 100;
743 		amperage = -amperage;
744 	} else
745 		charge = max = amperage = voltage = time = 0;
746 
747 	pmu_batteries[pmu_cur_battery].flags = bat_flags;
748 	pmu_batteries[pmu_cur_battery].charge = charge;
749 	pmu_batteries[pmu_cur_battery].max_charge = max;
750 	pmu_batteries[pmu_cur_battery].amperage = amperage;
751 	pmu_batteries[pmu_cur_battery].voltage = voltage;
752 	pmu_batteries[pmu_cur_battery].time_remaining = time;
753 #endif /* CONFIG_PPC_PMAC */
754 
755 	clear_bit(0, &async_req_locks);
756 }
757 
758 static void
done_battery_state_smart(struct adb_request * req)759 done_battery_state_smart(struct adb_request* req)
760 {
761 	/* format:
762 	 *  [0] : format of this structure (known: 3,4,5)
763 	 *  [1] : flags
764 	 *
765 	 *  format 3 & 4:
766 	 *
767 	 *  [2] : charge
768 	 *  [3] : max charge
769 	 *  [4] : current
770 	 *  [5] : voltage
771 	 *
772 	 *  format 5:
773 	 *
774 	 *  [2][3] : charge
775 	 *  [4][5] : max charge
776 	 *  [6][7] : current
777 	 *  [8][9] : voltage
778 	 */
779 
780 	unsigned int bat_flags = PMU_BATT_TYPE_SMART;
781 	int amperage;
782 	unsigned int capa, max, voltage;
783 
784 	if (req->reply[1] & 0x01)
785 		pmu_power_flags |= PMU_PWR_AC_PRESENT;
786 	else
787 		pmu_power_flags &= ~PMU_PWR_AC_PRESENT;
788 
789 
790 	capa = max = amperage = voltage = 0;
791 
792 	if (req->reply[1] & 0x04) {
793 		bat_flags |= PMU_BATT_PRESENT;
794 		switch(req->reply[0]) {
795 			case 3:
796 			case 4: capa = req->reply[2];
797 				max = req->reply[3];
798 				amperage = *((signed char *)&req->reply[4]);
799 				voltage = req->reply[5];
800 				break;
801 			case 5: capa = (req->reply[2] << 8) | req->reply[3];
802 				max = (req->reply[4] << 8) | req->reply[5];
803 				amperage = *((signed short *)&req->reply[6]);
804 				voltage = (req->reply[8] << 8) | req->reply[9];
805 				break;
806 			default:
807 				pr_warn("pmu.c: unrecognized battery info, "
808 					"len: %d, %4ph\n", req->reply_len,
809 							   req->reply);
810 				break;
811 		}
812 	}
813 
814 	if ((req->reply[1] & 0x01) && (amperage > 0))
815 		bat_flags |= PMU_BATT_CHARGING;
816 
817 	pmu_batteries[pmu_cur_battery].flags = bat_flags;
818 	pmu_batteries[pmu_cur_battery].charge = capa;
819 	pmu_batteries[pmu_cur_battery].max_charge = max;
820 	pmu_batteries[pmu_cur_battery].amperage = amperage;
821 	pmu_batteries[pmu_cur_battery].voltage = voltage;
822 	if (amperage) {
823 		if ((req->reply[1] & 0x01) && (amperage > 0))
824 			pmu_batteries[pmu_cur_battery].time_remaining
825 				= ((max-capa) * 3600) / amperage;
826 		else
827 			pmu_batteries[pmu_cur_battery].time_remaining
828 				= (capa * 3600) / (-amperage);
829 	} else
830 		pmu_batteries[pmu_cur_battery].time_remaining = 0;
831 
832 	pmu_cur_battery = (pmu_cur_battery + 1) % pmu_battery_count;
833 
834 	clear_bit(0, &async_req_locks);
835 }
836 
837 static void
query_battery_state(void)838 query_battery_state(void)
839 {
840 	if (test_and_set_bit(0, &async_req_locks))
841 		return;
842 	if (pmu_kind == PMU_OHARE_BASED)
843 		pmu_request(&batt_req, done_battery_state_ohare,
844 			1, PMU_BATTERY_STATE);
845 	else
846 		pmu_request(&batt_req, done_battery_state_smart,
847 			2, PMU_SMART_BATTERY_STATE, pmu_cur_battery+1);
848 }
849 
850 #ifdef CONFIG_PROC_FS
pmu_info_proc_show(struct seq_file * m,void * v)851 static int pmu_info_proc_show(struct seq_file *m, void *v)
852 {
853 	seq_printf(m, "PMU driver version     : %d\n", PMU_DRIVER_VERSION);
854 	seq_printf(m, "PMU firmware version   : %02x\n", pmu_version);
855 	seq_printf(m, "AC Power               : %d\n",
856 		((pmu_power_flags & PMU_PWR_AC_PRESENT) != 0) || pmu_battery_count == 0);
857 	seq_printf(m, "Battery count          : %d\n", pmu_battery_count);
858 
859 	return 0;
860 }
861 
pmu_irqstats_proc_show(struct seq_file * m,void * v)862 static int pmu_irqstats_proc_show(struct seq_file *m, void *v)
863 {
864 	int i;
865 	static const char *irq_names[NUM_IRQ_STATS] = {
866 		"Unknown interrupt (type 0)",
867 		"Unknown interrupt (type 1)",
868 		"PC-Card eject button",
869 		"Sound/Brightness button",
870 		"ADB message",
871 		"Battery state change",
872 		"Environment interrupt",
873 		"Tick timer",
874 		"Ghost interrupt (zero len)",
875 		"Empty interrupt (empty mask)",
876 		"Max irqs in a row",
877 		"Total CB1 triggered events",
878 		"Total GPIO1 triggered events",
879         };
880 
881 	for (i = 0; i < NUM_IRQ_STATS; i++) {
882 		seq_printf(m, " %2u: %10u (%s)\n",
883 			     i, pmu_irq_stats[i], irq_names[i]);
884 	}
885 	return 0;
886 }
887 
pmu_battery_proc_show(struct seq_file * m,void * v)888 static int pmu_battery_proc_show(struct seq_file *m, void *v)
889 {
890 	long batnum = (long)m->private;
891 
892 	seq_putc(m, '\n');
893 	seq_printf(m, "flags      : %08x\n", pmu_batteries[batnum].flags);
894 	seq_printf(m, "charge     : %d\n", pmu_batteries[batnum].charge);
895 	seq_printf(m, "max_charge : %d\n", pmu_batteries[batnum].max_charge);
896 	seq_printf(m, "current    : %d\n", pmu_batteries[batnum].amperage);
897 	seq_printf(m, "voltage    : %d\n", pmu_batteries[batnum].voltage);
898 	seq_printf(m, "time rem.  : %d\n", pmu_batteries[batnum].time_remaining);
899 	return 0;
900 }
901 
pmu_options_proc_show(struct seq_file * m,void * v)902 static int pmu_options_proc_show(struct seq_file *m, void *v)
903 {
904 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
905 	if (pmu_kind == PMU_KEYLARGO_BASED &&
906 	    pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) >= 0)
907 		seq_printf(m, "lid_wakeup=%d\n", option_lid_wakeup);
908 #endif
909 	if (pmu_kind == PMU_KEYLARGO_BASED)
910 		seq_printf(m, "server_mode=%d\n", option_server_mode);
911 
912 	return 0;
913 }
914 
pmu_options_proc_open(struct inode * inode,struct file * file)915 static int pmu_options_proc_open(struct inode *inode, struct file *file)
916 {
917 	return single_open(file, pmu_options_proc_show, NULL);
918 }
919 
pmu_options_proc_write(struct file * file,const char __user * buffer,size_t count,loff_t * pos)920 static ssize_t pmu_options_proc_write(struct file *file,
921 		const char __user *buffer, size_t count, loff_t *pos)
922 {
923 	char tmp[33];
924 	char *label, *val;
925 	size_t fcount = count;
926 
927 	if (!count)
928 		return -EINVAL;
929 	if (count > 32)
930 		count = 32;
931 	if (copy_from_user(tmp, buffer, count))
932 		return -EFAULT;
933 	tmp[count] = 0;
934 
935 	label = tmp;
936 	while(*label == ' ')
937 		label++;
938 	val = label;
939 	while(*val && (*val != '=')) {
940 		if (*val == ' ')
941 			*val = 0;
942 		val++;
943 	}
944 	if ((*val) == 0)
945 		return -EINVAL;
946 	*(val++) = 0;
947 	while(*val == ' ')
948 		val++;
949 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
950 	if (pmu_kind == PMU_KEYLARGO_BASED &&
951 	    pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) >= 0)
952 		if (!strcmp(label, "lid_wakeup"))
953 			option_lid_wakeup = ((*val) == '1');
954 #endif
955 	if (pmu_kind == PMU_KEYLARGO_BASED && !strcmp(label, "server_mode")) {
956 		int new_value;
957 		new_value = ((*val) == '1');
958 		if (new_value != option_server_mode)
959 			pmu_set_server_mode(new_value);
960 	}
961 	return fcount;
962 }
963 
964 static const struct proc_ops pmu_options_proc_ops = {
965 	.proc_open	= pmu_options_proc_open,
966 	.proc_read	= seq_read,
967 	.proc_lseek	= seq_lseek,
968 	.proc_release	= single_release,
969 	.proc_write	= pmu_options_proc_write,
970 };
971 #endif
972 
973 #ifdef CONFIG_ADB
974 /* Send an ADB command */
pmu_send_request(struct adb_request * req,int sync)975 static int pmu_send_request(struct adb_request *req, int sync)
976 {
977 	int i, ret;
978 
979 	if (pmu_state == uninitialized || !pmu_fully_inited) {
980 		req->complete = 1;
981 		return -ENXIO;
982 	}
983 
984 	ret = -EINVAL;
985 
986 	switch (req->data[0]) {
987 	case PMU_PACKET:
988 		for (i = 0; i < req->nbytes - 1; ++i)
989 			req->data[i] = req->data[i+1];
990 		--req->nbytes;
991 		if (pmu_data_len[req->data[0]][1] != 0) {
992 			req->reply[0] = ADB_RET_OK;
993 			req->reply_len = 1;
994 		} else
995 			req->reply_len = 0;
996 		ret = pmu_queue_request(req);
997 		break;
998 	case CUDA_PACKET:
999 		switch (req->data[1]) {
1000 		case CUDA_GET_TIME:
1001 			if (req->nbytes != 2)
1002 				break;
1003 			req->data[0] = PMU_READ_RTC;
1004 			req->nbytes = 1;
1005 			req->reply_len = 3;
1006 			req->reply[0] = CUDA_PACKET;
1007 			req->reply[1] = 0;
1008 			req->reply[2] = CUDA_GET_TIME;
1009 			ret = pmu_queue_request(req);
1010 			break;
1011 		case CUDA_SET_TIME:
1012 			if (req->nbytes != 6)
1013 				break;
1014 			req->data[0] = PMU_SET_RTC;
1015 			req->nbytes = 5;
1016 			for (i = 1; i <= 4; ++i)
1017 				req->data[i] = req->data[i+1];
1018 			req->reply_len = 3;
1019 			req->reply[0] = CUDA_PACKET;
1020 			req->reply[1] = 0;
1021 			req->reply[2] = CUDA_SET_TIME;
1022 			ret = pmu_queue_request(req);
1023 			break;
1024 		}
1025 		break;
1026 	case ADB_PACKET:
1027 	    	if (!pmu_has_adb)
1028     			return -ENXIO;
1029 		for (i = req->nbytes - 1; i > 1; --i)
1030 			req->data[i+2] = req->data[i];
1031 		req->data[3] = req->nbytes - 2;
1032 		req->data[2] = pmu_adb_flags;
1033 		/*req->data[1] = req->data[1];*/
1034 		req->data[0] = PMU_ADB_CMD;
1035 		req->nbytes += 2;
1036 		req->reply_expected = 1;
1037 		req->reply_len = 0;
1038 		ret = pmu_queue_request(req);
1039 		break;
1040 	}
1041 	if (ret) {
1042 		req->complete = 1;
1043 		return ret;
1044 	}
1045 
1046 	if (sync)
1047 		while (!req->complete)
1048 			pmu_poll();
1049 
1050 	return 0;
1051 }
1052 
1053 /* Enable/disable autopolling */
__pmu_adb_autopoll(int devs)1054 static int __pmu_adb_autopoll(int devs)
1055 {
1056 	struct adb_request req;
1057 
1058 	if (devs) {
1059 		pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
1060 			    adb_dev_map >> 8, adb_dev_map);
1061 		pmu_adb_flags = 2;
1062 	} else {
1063 		pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
1064 		pmu_adb_flags = 0;
1065 	}
1066 	while (!req.complete)
1067 		pmu_poll();
1068 	return 0;
1069 }
1070 
pmu_adb_autopoll(int devs)1071 static int pmu_adb_autopoll(int devs)
1072 {
1073 	if (pmu_state == uninitialized || !pmu_fully_inited || !pmu_has_adb)
1074 		return -ENXIO;
1075 
1076 	adb_dev_map = devs;
1077 	return __pmu_adb_autopoll(devs);
1078 }
1079 
1080 /* Reset the ADB bus */
pmu_adb_reset_bus(void)1081 static int pmu_adb_reset_bus(void)
1082 {
1083 	struct adb_request req;
1084 	int save_autopoll = adb_dev_map;
1085 
1086 	if (pmu_state == uninitialized || !pmu_fully_inited || !pmu_has_adb)
1087 		return -ENXIO;
1088 
1089 	/* anyone got a better idea?? */
1090 	__pmu_adb_autopoll(0);
1091 
1092 	req.nbytes = 4;
1093 	req.done = NULL;
1094 	req.data[0] = PMU_ADB_CMD;
1095 	req.data[1] = ADB_BUSRESET;
1096 	req.data[2] = 0;
1097 	req.data[3] = 0;
1098 	req.data[4] = 0;
1099 	req.reply_len = 0;
1100 	req.reply_expected = 1;
1101 	if (pmu_queue_request(&req) != 0) {
1102 		printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
1103 		return -EIO;
1104 	}
1105 	pmu_wait_complete(&req);
1106 
1107 	if (save_autopoll != 0)
1108 		__pmu_adb_autopoll(save_autopoll);
1109 
1110 	return 0;
1111 }
1112 #endif /* CONFIG_ADB */
1113 
1114 /* Construct and send a pmu request */
1115 int
pmu_request(struct adb_request * req,void (* done)(struct adb_request *),int nbytes,...)1116 pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
1117 	    int nbytes, ...)
1118 {
1119 	va_list list;
1120 	int i;
1121 
1122 	if (pmu_state == uninitialized)
1123 		return -ENXIO;
1124 
1125 	if (nbytes < 0 || nbytes > 32) {
1126 		printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
1127 		req->complete = 1;
1128 		return -EINVAL;
1129 	}
1130 	req->nbytes = nbytes;
1131 	req->done = done;
1132 	va_start(list, nbytes);
1133 	for (i = 0; i < nbytes; ++i)
1134 		req->data[i] = va_arg(list, int);
1135 	va_end(list);
1136 	req->reply_len = 0;
1137 	req->reply_expected = 0;
1138 	return pmu_queue_request(req);
1139 }
1140 
1141 int
pmu_queue_request(struct adb_request * req)1142 pmu_queue_request(struct adb_request *req)
1143 {
1144 	unsigned long flags;
1145 	int nsend;
1146 
1147 	if (pmu_state == uninitialized) {
1148 		req->complete = 1;
1149 		return -ENXIO;
1150 	}
1151 	if (req->nbytes <= 0) {
1152 		req->complete = 1;
1153 		return 0;
1154 	}
1155 	nsend = pmu_data_len[req->data[0]][0];
1156 	if (nsend >= 0 && req->nbytes != nsend + 1) {
1157 		req->complete = 1;
1158 		return -EINVAL;
1159 	}
1160 
1161 	req->next = NULL;
1162 	req->sent = 0;
1163 	req->complete = 0;
1164 
1165 	spin_lock_irqsave(&pmu_lock, flags);
1166 	if (current_req) {
1167 		last_req->next = req;
1168 		last_req = req;
1169 	} else {
1170 		current_req = req;
1171 		last_req = req;
1172 		if (pmu_state == idle)
1173 			pmu_start();
1174 	}
1175 	spin_unlock_irqrestore(&pmu_lock, flags);
1176 
1177 	return 0;
1178 }
1179 
1180 static inline void
wait_for_ack(void)1181 wait_for_ack(void)
1182 {
1183 	/* Sightly increased the delay, I had one occurrence of the message
1184 	 * reported
1185 	 */
1186 	int timeout = 4000;
1187 	while ((in_8(&via2[B]) & TACK) == 0) {
1188 		if (--timeout < 0) {
1189 			printk(KERN_ERR "PMU not responding (!ack)\n");
1190 			return;
1191 		}
1192 		udelay(10);
1193 	}
1194 }
1195 
1196 /* New PMU seems to be very sensitive to those timings, so we make sure
1197  * PCI is flushed immediately */
1198 static inline void
send_byte(int x)1199 send_byte(int x)
1200 {
1201 	out_8(&via1[ACR], in_8(&via1[ACR]) | SR_OUT | SR_EXT);
1202 	out_8(&via1[SR], x);
1203 	out_8(&via2[B], in_8(&via2[B]) & ~TREQ);	/* assert TREQ */
1204 	(void)in_8(&via2[B]);
1205 }
1206 
1207 static inline void
recv_byte(void)1208 recv_byte(void)
1209 {
1210 	out_8(&via1[ACR], (in_8(&via1[ACR]) & ~SR_OUT) | SR_EXT);
1211 	in_8(&via1[SR]);		/* resets SR */
1212 	out_8(&via2[B], in_8(&via2[B]) & ~TREQ);
1213 	(void)in_8(&via2[B]);
1214 }
1215 
1216 static inline void
pmu_done(struct adb_request * req)1217 pmu_done(struct adb_request *req)
1218 {
1219 	void (*done)(struct adb_request *) = req->done;
1220 	mb();
1221 	req->complete = 1;
1222     	/* Here, we assume that if the request has a done member, the
1223     	 * struct request will survive to setting req->complete to 1
1224     	 */
1225 	if (done)
1226 		(*done)(req);
1227 }
1228 
1229 static void
pmu_start(void)1230 pmu_start(void)
1231 {
1232 	struct adb_request *req;
1233 
1234 	/* assert pmu_state == idle */
1235 	/* get the packet to send */
1236 	req = current_req;
1237 	if (!req || pmu_state != idle
1238 	    || (/*req->reply_expected && */req_awaiting_reply))
1239 		return;
1240 
1241 	pmu_state = sending;
1242 	data_index = 1;
1243 	data_len = pmu_data_len[req->data[0]][0];
1244 
1245 	/* Sounds safer to make sure ACK is high before writing. This helped
1246 	 * kill a problem with ADB and some iBooks
1247 	 */
1248 	wait_for_ack();
1249 	/* set the shift register to shift out and send a byte */
1250 	send_byte(req->data[0]);
1251 }
1252 
1253 void
pmu_poll(void)1254 pmu_poll(void)
1255 {
1256 	if (pmu_state == uninitialized)
1257 		return;
1258 	if (disable_poll)
1259 		return;
1260 	via_pmu_interrupt(0, NULL);
1261 }
1262 
1263 void
pmu_poll_adb(void)1264 pmu_poll_adb(void)
1265 {
1266 	if (pmu_state == uninitialized)
1267 		return;
1268 	if (disable_poll)
1269 		return;
1270 	/* Kicks ADB read when PMU is suspended */
1271 	adb_int_pending = 1;
1272 	do {
1273 		via_pmu_interrupt(0, NULL);
1274 	} while (pmu_suspended && (adb_int_pending || pmu_state != idle
1275 		|| req_awaiting_reply));
1276 }
1277 
1278 void
pmu_wait_complete(struct adb_request * req)1279 pmu_wait_complete(struct adb_request *req)
1280 {
1281 	if (pmu_state == uninitialized)
1282 		return;
1283 	while((pmu_state != idle && pmu_state != locked) || !req->complete)
1284 		via_pmu_interrupt(0, NULL);
1285 }
1286 
1287 /* This function loops until the PMU is idle and prevents it from
1288  * anwsering to ADB interrupts. pmu_request can still be called.
1289  * This is done to avoid spurrious shutdowns when we know we'll have
1290  * interrupts switched off for a long time
1291  */
1292 void
pmu_suspend(void)1293 pmu_suspend(void)
1294 {
1295 	unsigned long flags;
1296 
1297 	if (pmu_state == uninitialized)
1298 		return;
1299 
1300 	spin_lock_irqsave(&pmu_lock, flags);
1301 	pmu_suspended++;
1302 	if (pmu_suspended > 1) {
1303 		spin_unlock_irqrestore(&pmu_lock, flags);
1304 		return;
1305 	}
1306 
1307 	do {
1308 		spin_unlock_irqrestore(&pmu_lock, flags);
1309 		if (req_awaiting_reply)
1310 			adb_int_pending = 1;
1311 		via_pmu_interrupt(0, NULL);
1312 		spin_lock_irqsave(&pmu_lock, flags);
1313 		if (!adb_int_pending && pmu_state == idle && !req_awaiting_reply) {
1314 			if (gpio_irq >= 0)
1315 				disable_irq_nosync(gpio_irq);
1316 			out_8(&via1[IER], CB1_INT | IER_CLR);
1317 			spin_unlock_irqrestore(&pmu_lock, flags);
1318 			break;
1319 		}
1320 	} while (1);
1321 }
1322 
1323 void
pmu_resume(void)1324 pmu_resume(void)
1325 {
1326 	unsigned long flags;
1327 
1328 	if (pmu_state == uninitialized || pmu_suspended < 1)
1329 		return;
1330 
1331 	spin_lock_irqsave(&pmu_lock, flags);
1332 	pmu_suspended--;
1333 	if (pmu_suspended > 0) {
1334 		spin_unlock_irqrestore(&pmu_lock, flags);
1335 		return;
1336 	}
1337 	adb_int_pending = 1;
1338 	if (gpio_irq >= 0)
1339 		enable_irq(gpio_irq);
1340 	out_8(&via1[IER], CB1_INT | IER_SET);
1341 	spin_unlock_irqrestore(&pmu_lock, flags);
1342 	pmu_poll();
1343 }
1344 
1345 /* Interrupt data could be the result data from an ADB cmd */
1346 static void
pmu_handle_data(unsigned char * data,int len)1347 pmu_handle_data(unsigned char *data, int len)
1348 {
1349 	unsigned char ints;
1350 	int idx;
1351 	int i = 0;
1352 
1353 	asleep = 0;
1354 	if (drop_interrupts || len < 1) {
1355 		adb_int_pending = 0;
1356 		pmu_irq_stats[8]++;
1357 		return;
1358 	}
1359 
1360 	/* Get PMU interrupt mask */
1361 	ints = data[0];
1362 
1363 	/* Record zero interrupts for stats */
1364 	if (ints == 0)
1365 		pmu_irq_stats[9]++;
1366 
1367 	/* Hack to deal with ADB autopoll flag */
1368 	if (ints & PMU_INT_ADB)
1369 		ints &= ~(PMU_INT_ADB_AUTO | PMU_INT_AUTO_SRQ_POLL);
1370 
1371 next:
1372 	if (ints == 0) {
1373 		if (i > pmu_irq_stats[10])
1374 			pmu_irq_stats[10] = i;
1375 		return;
1376 	}
1377 	i++;
1378 
1379 	idx = ffs(ints) - 1;
1380 	ints &= ~BIT(idx);
1381 
1382 	pmu_irq_stats[idx]++;
1383 
1384 	/* Note: for some reason, we get an interrupt with len=1,
1385 	 * data[0]==0 after each normal ADB interrupt, at least
1386 	 * on the Pismo. Still investigating...  --BenH
1387 	 */
1388 	switch (BIT(idx)) {
1389 	case PMU_INT_ADB:
1390 		if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
1391 			struct adb_request *req = req_awaiting_reply;
1392 			if (!req) {
1393 				printk(KERN_ERR "PMU: extra ADB reply\n");
1394 				return;
1395 			}
1396 			req_awaiting_reply = NULL;
1397 			if (len <= 2)
1398 				req->reply_len = 0;
1399 			else {
1400 				memcpy(req->reply, data + 1, len - 1);
1401 				req->reply_len = len - 1;
1402 			}
1403 			pmu_done(req);
1404 		} else {
1405 #ifdef CONFIG_XMON
1406 			if (len == 4 && data[1] == 0x2c) {
1407 				extern int xmon_wants_key, xmon_adb_keycode;
1408 				if (xmon_wants_key) {
1409 					xmon_adb_keycode = data[2];
1410 					return;
1411 				}
1412 			}
1413 #endif /* CONFIG_XMON */
1414 #ifdef CONFIG_ADB
1415 			/*
1416 			 * XXX On the [23]400 the PMU gives us an up
1417 			 * event for keycodes 0x74 or 0x75 when the PC
1418 			 * card eject buttons are released, so we
1419 			 * ignore those events.
1420 			 */
1421 			if (!(pmu_kind == PMU_OHARE_BASED && len == 4
1422 			      && data[1] == 0x2c && data[3] == 0xff
1423 			      && (data[2] & ~1) == 0xf4))
1424 				adb_input(data+1, len-1, 1);
1425 #endif /* CONFIG_ADB */
1426 		}
1427 		break;
1428 
1429 	/* Sound/brightness button pressed */
1430 	case PMU_INT_SNDBRT:
1431 #ifdef CONFIG_PMAC_BACKLIGHT
1432 		if (len == 3)
1433 			pmac_backlight_set_legacy_brightness_pmu(data[1] >> 4);
1434 #endif
1435 		break;
1436 
1437 	/* Tick interrupt */
1438 	case PMU_INT_TICK:
1439 		/* Environment or tick interrupt, query batteries */
1440 		if (pmu_battery_count) {
1441 			if ((--query_batt_timer) == 0) {
1442 				query_battery_state();
1443 				query_batt_timer = BATTERY_POLLING_COUNT;
1444 			}
1445 		}
1446 		break;
1447 
1448 	case PMU_INT_ENVIRONMENT:
1449 		if (pmu_battery_count)
1450 			query_battery_state();
1451 		pmu_pass_intr(data, len);
1452 		/* len == 6 is probably a bad check. But how do I
1453 		 * know what PMU versions send what events here? */
1454 		if (IS_ENABLED(CONFIG_ADB_PMU_EVENT) && len == 6) {
1455 			via_pmu_event(PMU_EVT_POWER, !!(data[1]&8));
1456 			via_pmu_event(PMU_EVT_LID, data[1]&1);
1457 		}
1458 		break;
1459 
1460 	default:
1461 	       pmu_pass_intr(data, len);
1462 	}
1463 	goto next;
1464 }
1465 
1466 static struct adb_request*
pmu_sr_intr(void)1467 pmu_sr_intr(void)
1468 {
1469 	struct adb_request *req;
1470 	int bite = 0;
1471 
1472 	if (in_8(&via2[B]) & TREQ) {
1473 		printk(KERN_ERR "PMU: spurious SR intr (%x)\n", in_8(&via2[B]));
1474 		return NULL;
1475 	}
1476 	/* The ack may not yet be low when we get the interrupt */
1477 	while ((in_8(&via2[B]) & TACK) != 0)
1478 			;
1479 
1480 	/* if reading grab the byte, and reset the interrupt */
1481 	if (pmu_state == reading || pmu_state == reading_intr)
1482 		bite = in_8(&via1[SR]);
1483 
1484 	/* reset TREQ and wait for TACK to go high */
1485 	out_8(&via2[B], in_8(&via2[B]) | TREQ);
1486 	wait_for_ack();
1487 
1488 	switch (pmu_state) {
1489 	case sending:
1490 		req = current_req;
1491 		if (data_len < 0) {
1492 			data_len = req->nbytes - 1;
1493 			send_byte(data_len);
1494 			break;
1495 		}
1496 		if (data_index <= data_len) {
1497 			send_byte(req->data[data_index++]);
1498 			break;
1499 		}
1500 		req->sent = 1;
1501 		data_len = pmu_data_len[req->data[0]][1];
1502 		if (data_len == 0) {
1503 			pmu_state = idle;
1504 			current_req = req->next;
1505 			if (req->reply_expected)
1506 				req_awaiting_reply = req;
1507 			else
1508 				return req;
1509 		} else {
1510 			pmu_state = reading;
1511 			data_index = 0;
1512 			reply_ptr = req->reply + req->reply_len;
1513 			recv_byte();
1514 		}
1515 		break;
1516 
1517 	case intack:
1518 		data_index = 0;
1519 		data_len = -1;
1520 		pmu_state = reading_intr;
1521 		reply_ptr = interrupt_data[int_data_last];
1522 		recv_byte();
1523 		if (gpio_irq >= 0 && !gpio_irq_enabled) {
1524 			enable_irq(gpio_irq);
1525 			gpio_irq_enabled = 1;
1526 		}
1527 		break;
1528 
1529 	case reading:
1530 	case reading_intr:
1531 		if (data_len == -1) {
1532 			data_len = bite;
1533 			if (bite > 32)
1534 				printk(KERN_ERR "PMU: bad reply len %d\n", bite);
1535 		} else if (data_index < 32) {
1536 			reply_ptr[data_index++] = bite;
1537 		}
1538 		if (data_index < data_len) {
1539 			recv_byte();
1540 			break;
1541 		}
1542 
1543 		if (pmu_state == reading_intr) {
1544 			pmu_state = idle;
1545 			int_data_state[int_data_last] = int_data_ready;
1546 			interrupt_data_len[int_data_last] = data_len;
1547 		} else {
1548 			req = current_req;
1549 			/*
1550 			 * For PMU sleep and freq change requests, we lock the
1551 			 * PMU until it's explicitly unlocked. This avoids any
1552 			 * spurrious event polling getting in
1553 			 */
1554 			current_req = req->next;
1555 			req->reply_len += data_index;
1556 			if (req->data[0] == PMU_SLEEP || req->data[0] == PMU_CPU_SPEED)
1557 				pmu_state = locked;
1558 			else
1559 				pmu_state = idle;
1560 			return req;
1561 		}
1562 		break;
1563 
1564 	default:
1565 		printk(KERN_ERR "via_pmu_interrupt: unknown state %d?\n",
1566 		       pmu_state);
1567 	}
1568 	return NULL;
1569 }
1570 
1571 static irqreturn_t
via_pmu_interrupt(int irq,void * arg)1572 via_pmu_interrupt(int irq, void *arg)
1573 {
1574 	unsigned long flags;
1575 	int intr;
1576 	int nloop = 0;
1577 	int int_data = -1;
1578 	struct adb_request *req = NULL;
1579 	int handled = 0;
1580 
1581 	/* This is a bit brutal, we can probably do better */
1582 	spin_lock_irqsave(&pmu_lock, flags);
1583 	++disable_poll;
1584 
1585 	for (;;) {
1586 		/* On 68k Macs, VIA interrupts are dispatched individually.
1587 		 * Unless we are polling, the relevant IRQ flag has already
1588 		 * been cleared.
1589 		 */
1590 		intr = 0;
1591 		if (IS_ENABLED(CONFIG_PPC_PMAC) || !irq) {
1592 			intr = in_8(&via1[IFR]) & (SR_INT | CB1_INT);
1593 			out_8(&via1[IFR], intr);
1594 		}
1595 #ifndef CONFIG_PPC_PMAC
1596 		switch (irq) {
1597 		case IRQ_MAC_ADB_CL:
1598 			intr = CB1_INT;
1599 			break;
1600 		case IRQ_MAC_ADB_SR:
1601 			intr = SR_INT;
1602 			break;
1603 		}
1604 #endif
1605 		if (intr == 0)
1606 			break;
1607 		handled = 1;
1608 		if (++nloop > 1000) {
1609 			printk(KERN_DEBUG "PMU: stuck in intr loop, "
1610 			       "intr=%x, ier=%x pmu_state=%d\n",
1611 			       intr, in_8(&via1[IER]), pmu_state);
1612 			break;
1613 		}
1614 		if (intr & CB1_INT) {
1615 			adb_int_pending = 1;
1616 			pmu_irq_stats[11]++;
1617 		}
1618 		if (intr & SR_INT) {
1619 			req = pmu_sr_intr();
1620 			if (req)
1621 				break;
1622 		}
1623 #ifndef CONFIG_PPC_PMAC
1624 		break;
1625 #endif
1626 	}
1627 
1628 recheck:
1629 	if (pmu_state == idle) {
1630 		if (adb_int_pending) {
1631 			if (int_data_state[0] == int_data_empty)
1632 				int_data_last = 0;
1633 			else if (int_data_state[1] == int_data_empty)
1634 				int_data_last = 1;
1635 			else
1636 				goto no_free_slot;
1637 			pmu_state = intack;
1638 			int_data_state[int_data_last] = int_data_fill;
1639 			/* Sounds safer to make sure ACK is high before writing.
1640 			 * This helped kill a problem with ADB and some iBooks
1641 			 */
1642 			wait_for_ack();
1643 			send_byte(PMU_INT_ACK);
1644 			adb_int_pending = 0;
1645 		} else if (current_req)
1646 			pmu_start();
1647 	}
1648 no_free_slot:
1649 	/* Mark the oldest buffer for flushing */
1650 	if (int_data_state[!int_data_last] == int_data_ready) {
1651 		int_data_state[!int_data_last] = int_data_flush;
1652 		int_data = !int_data_last;
1653 	} else if (int_data_state[int_data_last] == int_data_ready) {
1654 		int_data_state[int_data_last] = int_data_flush;
1655 		int_data = int_data_last;
1656 	}
1657 	--disable_poll;
1658 	spin_unlock_irqrestore(&pmu_lock, flags);
1659 
1660 	/* Deal with completed PMU requests outside of the lock */
1661 	if (req) {
1662 		pmu_done(req);
1663 		req = NULL;
1664 	}
1665 
1666 	/* Deal with interrupt datas outside of the lock */
1667 	if (int_data >= 0) {
1668 		pmu_handle_data(interrupt_data[int_data], interrupt_data_len[int_data]);
1669 		spin_lock_irqsave(&pmu_lock, flags);
1670 		++disable_poll;
1671 		int_data_state[int_data] = int_data_empty;
1672 		int_data = -1;
1673 		goto recheck;
1674 	}
1675 
1676 	return IRQ_RETVAL(handled);
1677 }
1678 
1679 void
pmu_unlock(void)1680 pmu_unlock(void)
1681 {
1682 	unsigned long flags;
1683 
1684 	spin_lock_irqsave(&pmu_lock, flags);
1685 	if (pmu_state == locked)
1686 		pmu_state = idle;
1687 	adb_int_pending = 1;
1688 	spin_unlock_irqrestore(&pmu_lock, flags);
1689 }
1690 
1691 
1692 static __maybe_unused irqreturn_t
gpio1_interrupt(int irq,void * arg)1693 gpio1_interrupt(int irq, void *arg)
1694 {
1695 	unsigned long flags;
1696 
1697 	if ((in_8(gpio_reg + 0x9) & 0x02) == 0) {
1698 		spin_lock_irqsave(&pmu_lock, flags);
1699 		if (gpio_irq_enabled > 0) {
1700 			disable_irq_nosync(gpio_irq);
1701 			gpio_irq_enabled = 0;
1702 		}
1703 		pmu_irq_stats[12]++;
1704 		adb_int_pending = 1;
1705 		spin_unlock_irqrestore(&pmu_lock, flags);
1706 		via_pmu_interrupt(0, NULL);
1707 		return IRQ_HANDLED;
1708 	}
1709 	return IRQ_NONE;
1710 }
1711 
1712 void
pmu_enable_irled(int on)1713 pmu_enable_irled(int on)
1714 {
1715 	struct adb_request req;
1716 
1717 	if (pmu_state == uninitialized)
1718 		return ;
1719 	if (pmu_kind == PMU_KEYLARGO_BASED)
1720 		return ;
1721 
1722 	pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
1723 	    (on ? PMU_POW_ON : PMU_POW_OFF));
1724 	pmu_wait_complete(&req);
1725 }
1726 
1727 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
1728 #define RTC_OFFSET	2082844800
1729 
pmu_get_time(void)1730 time64_t pmu_get_time(void)
1731 {
1732 	struct adb_request req;
1733 	u32 now;
1734 
1735 	if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
1736 		return 0;
1737 	pmu_wait_complete(&req);
1738 	if (req.reply_len != 4)
1739 		pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
1740 	now = (req.reply[0] << 24) + (req.reply[1] << 16) +
1741 	      (req.reply[2] << 8) + req.reply[3];
1742 	return (time64_t)now - RTC_OFFSET;
1743 }
1744 
pmu_set_rtc_time(struct rtc_time * tm)1745 int pmu_set_rtc_time(struct rtc_time *tm)
1746 {
1747 	u32 now;
1748 	struct adb_request req;
1749 
1750 	now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
1751 	if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
1752 	                now >> 24, now >> 16, now >> 8, now) < 0)
1753 		return -ENXIO;
1754 	pmu_wait_complete(&req);
1755 	if (req.reply_len != 0)
1756 		pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
1757 	return 0;
1758 }
1759 
1760 void
pmu_restart(void)1761 pmu_restart(void)
1762 {
1763 	struct adb_request req;
1764 
1765 	if (pmu_state == uninitialized)
1766 		return;
1767 
1768 	local_irq_disable();
1769 
1770 	drop_interrupts = 1;
1771 
1772 	if (pmu_kind != PMU_KEYLARGO_BASED) {
1773 		pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB |
1774 						PMU_INT_TICK );
1775 		while(!req.complete)
1776 			pmu_poll();
1777 	}
1778 
1779 	pmu_request(&req, NULL, 1, PMU_RESET);
1780 	pmu_wait_complete(&req);
1781 	for (;;)
1782 		;
1783 }
1784 
1785 void
pmu_shutdown(void)1786 pmu_shutdown(void)
1787 {
1788 	struct adb_request req;
1789 
1790 	if (pmu_state == uninitialized)
1791 		return;
1792 
1793 	local_irq_disable();
1794 
1795 	drop_interrupts = 1;
1796 
1797 	if (pmu_kind != PMU_KEYLARGO_BASED) {
1798 		pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB |
1799 						PMU_INT_TICK );
1800 		pmu_wait_complete(&req);
1801 	} else {
1802 		/* Disable server mode on shutdown or we'll just
1803 		 * wake up again
1804 		 */
1805 		pmu_set_server_mode(0);
1806 	}
1807 
1808 	pmu_request(&req, NULL, 5, PMU_SHUTDOWN,
1809 		    'M', 'A', 'T', 'T');
1810 	pmu_wait_complete(&req);
1811 	for (;;)
1812 		;
1813 }
1814 
1815 int
pmu_present(void)1816 pmu_present(void)
1817 {
1818 	return pmu_state != uninitialized;
1819 }
1820 
1821 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
1822 /*
1823  * Put the powerbook to sleep.
1824  */
1825 
1826 static u32 save_via[8];
1827 static int __fake_sleep;
1828 
1829 static void
save_via_state(void)1830 save_via_state(void)
1831 {
1832 	save_via[0] = in_8(&via1[ANH]);
1833 	save_via[1] = in_8(&via1[DIRA]);
1834 	save_via[2] = in_8(&via1[B]);
1835 	save_via[3] = in_8(&via1[DIRB]);
1836 	save_via[4] = in_8(&via1[PCR]);
1837 	save_via[5] = in_8(&via1[ACR]);
1838 	save_via[6] = in_8(&via1[T1CL]);
1839 	save_via[7] = in_8(&via1[T1CH]);
1840 }
1841 static void
restore_via_state(void)1842 restore_via_state(void)
1843 {
1844 	out_8(&via1[ANH],  save_via[0]);
1845 	out_8(&via1[DIRA], save_via[1]);
1846 	out_8(&via1[B],    save_via[2]);
1847 	out_8(&via1[DIRB], save_via[3]);
1848 	out_8(&via1[PCR],  save_via[4]);
1849 	out_8(&via1[ACR],  save_via[5]);
1850 	out_8(&via1[T1CL], save_via[6]);
1851 	out_8(&via1[T1CH], save_via[7]);
1852 	out_8(&via1[IER], IER_CLR | 0x7f);	/* disable all intrs */
1853 	out_8(&via1[IFR], 0x7f);			/* clear IFR */
1854 	out_8(&via1[IER], IER_SET | SR_INT | CB1_INT);
1855 }
1856 
1857 #define	GRACKLE_PM	(1<<7)
1858 #define GRACKLE_DOZE	(1<<5)
1859 #define	GRACKLE_NAP	(1<<4)
1860 #define	GRACKLE_SLEEP	(1<<3)
1861 
powerbook_sleep_grackle(void)1862 static int powerbook_sleep_grackle(void)
1863 {
1864 	unsigned long save_l2cr;
1865 	unsigned short pmcr1;
1866 	struct adb_request req;
1867 	struct pci_dev *grackle;
1868 
1869 	grackle = pci_get_domain_bus_and_slot(0, 0, 0);
1870 	if (!grackle)
1871 		return -ENODEV;
1872 
1873 	/* Turn off various things. Darwin does some retry tests here... */
1874 	pmu_request(&req, NULL, 2, PMU_POWER_CTRL0, PMU_POW0_OFF|PMU_POW0_HARD_DRIVE);
1875 	pmu_wait_complete(&req);
1876 	pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
1877 		PMU_POW_OFF|PMU_POW_BACKLIGHT|PMU_POW_IRLED|PMU_POW_MEDIABAY);
1878 	pmu_wait_complete(&req);
1879 
1880 	/* For 750, save backside cache setting and disable it */
1881 	save_l2cr = _get_L2CR();	/* (returns -1 if not available) */
1882 
1883 	if (!__fake_sleep) {
1884 		/* Ask the PMU to put us to sleep */
1885 		pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
1886 		pmu_wait_complete(&req);
1887 	}
1888 
1889 	/* The VIA is supposed not to be restored correctly*/
1890 	save_via_state();
1891 	/* We shut down some HW */
1892 	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,1);
1893 
1894 	pci_read_config_word(grackle, 0x70, &pmcr1);
1895 	/* Apparently, MacOS uses NAP mode for Grackle ??? */
1896 	pmcr1 &= ~(GRACKLE_DOZE|GRACKLE_SLEEP);
1897 	pmcr1 |= GRACKLE_PM|GRACKLE_NAP;
1898 	pci_write_config_word(grackle, 0x70, pmcr1);
1899 
1900 	/* Call low-level ASM sleep handler */
1901 	if (__fake_sleep)
1902 		mdelay(5000);
1903 	else
1904 		low_sleep_handler();
1905 
1906 	/* We're awake again, stop grackle PM */
1907 	pci_read_config_word(grackle, 0x70, &pmcr1);
1908 	pmcr1 &= ~(GRACKLE_PM|GRACKLE_DOZE|GRACKLE_SLEEP|GRACKLE_NAP);
1909 	pci_write_config_word(grackle, 0x70, pmcr1);
1910 
1911 	pci_dev_put(grackle);
1912 
1913 	/* Make sure the PMU is idle */
1914 	pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,0);
1915 	restore_via_state();
1916 
1917 	/* Restore L2 cache */
1918 	if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
1919  		_set_L2CR(save_l2cr);
1920 
1921 	/* Restore userland MMU context */
1922 	switch_mmu_context(NULL, current->active_mm, NULL);
1923 
1924 	/* Power things up */
1925 	pmu_unlock();
1926 	pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
1927 	pmu_wait_complete(&req);
1928 	pmu_request(&req, NULL, 2, PMU_POWER_CTRL0,
1929 			PMU_POW0_ON|PMU_POW0_HARD_DRIVE);
1930 	pmu_wait_complete(&req);
1931 	pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
1932 			PMU_POW_ON|PMU_POW_BACKLIGHT|PMU_POW_CHARGER|PMU_POW_IRLED|PMU_POW_MEDIABAY);
1933 	pmu_wait_complete(&req);
1934 
1935 	return 0;
1936 }
1937 
1938 static int
powerbook_sleep_Core99(void)1939 powerbook_sleep_Core99(void)
1940 {
1941 	unsigned long save_l2cr;
1942 	unsigned long save_l3cr;
1943 	struct adb_request req;
1944 
1945 	if (pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) < 0) {
1946 		printk(KERN_ERR "Sleep mode not supported on this machine\n");
1947 		return -ENOSYS;
1948 	}
1949 
1950 	if (num_online_cpus() > 1 || cpu_is_offline(0))
1951 		return -EAGAIN;
1952 
1953 	/* Stop environment and ADB interrupts */
1954 	pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, 0);
1955 	pmu_wait_complete(&req);
1956 
1957 	/* Tell PMU what events will wake us up */
1958 	pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_CLR_WAKEUP_EVENTS,
1959 		0xff, 0xff);
1960 	pmu_wait_complete(&req);
1961 	pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_SET_WAKEUP_EVENTS,
1962 		0, PMU_PWR_WAKEUP_KEY |
1963 		(option_lid_wakeup ? PMU_PWR_WAKEUP_LID_OPEN : 0));
1964 	pmu_wait_complete(&req);
1965 
1966 	/* Save the state of the L2 and L3 caches */
1967 	save_l3cr = _get_L3CR();	/* (returns -1 if not available) */
1968 	save_l2cr = _get_L2CR();	/* (returns -1 if not available) */
1969 
1970 	if (!__fake_sleep) {
1971 		/* Ask the PMU to put us to sleep */
1972 		pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
1973 		pmu_wait_complete(&req);
1974 	}
1975 
1976 	/* The VIA is supposed not to be restored correctly*/
1977 	save_via_state();
1978 
1979 	/* Shut down various ASICs. There's a chance that we can no longer
1980 	 * talk to the PMU after this, so I moved it to _after_ sending the
1981 	 * sleep command to it. Still need to be checked.
1982 	 */
1983 	pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 1);
1984 
1985 	/* Call low-level ASM sleep handler */
1986 	if (__fake_sleep)
1987 		mdelay(5000);
1988 	else
1989 		low_sleep_handler();
1990 
1991 	/* Restore Apple core ASICs state */
1992 	pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 0);
1993 
1994 	/* Restore VIA */
1995 	restore_via_state();
1996 
1997 	/* tweak LPJ before cpufreq is there */
1998 	loops_per_jiffy *= 2;
1999 
2000 	/* Restore video */
2001 	pmac_call_early_video_resume();
2002 
2003 	/* Restore L2 cache */
2004 	if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
2005  		_set_L2CR(save_l2cr);
2006 	/* Restore L3 cache */
2007 	if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
2008  		_set_L3CR(save_l3cr);
2009 
2010 	/* Restore userland MMU context */
2011 	switch_mmu_context(NULL, current->active_mm, NULL);
2012 
2013 	/* Tell PMU we are ready */
2014 	pmu_unlock();
2015 	pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
2016 	pmu_wait_complete(&req);
2017 	pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
2018 	pmu_wait_complete(&req);
2019 
2020 	/* Restore LPJ, cpufreq will adjust the cpu frequency */
2021 	loops_per_jiffy /= 2;
2022 
2023 	return 0;
2024 }
2025 
2026 #define PB3400_MEM_CTRL		0xf8000000
2027 #define PB3400_MEM_CTRL_SLEEP	0x70
2028 
2029 static void __iomem *pb3400_mem_ctrl;
2030 
powerbook_sleep_init_3400(void)2031 static void powerbook_sleep_init_3400(void)
2032 {
2033 	/* map in the memory controller registers */
2034 	pb3400_mem_ctrl = ioremap(PB3400_MEM_CTRL, 0x100);
2035 	if (pb3400_mem_ctrl == NULL)
2036 		printk(KERN_WARNING "ioremap failed: sleep won't be possible");
2037 }
2038 
powerbook_sleep_3400(void)2039 static int powerbook_sleep_3400(void)
2040 {
2041 	int i, x;
2042 	unsigned int hid0;
2043 	unsigned long msr;
2044 	struct adb_request sleep_req;
2045 	unsigned int __iomem *mem_ctrl_sleep;
2046 
2047 	if (pb3400_mem_ctrl == NULL)
2048 		return -ENOMEM;
2049 	mem_ctrl_sleep = pb3400_mem_ctrl + PB3400_MEM_CTRL_SLEEP;
2050 
2051 	/* Set the memory controller to keep the memory refreshed
2052 	   while we're asleep */
2053 	for (i = 0x403f; i >= 0x4000; --i) {
2054 		out_be32(mem_ctrl_sleep, i);
2055 		do {
2056 			x = (in_be32(mem_ctrl_sleep) >> 16) & 0x3ff;
2057 		} while (x == 0);
2058 		if (x >= 0x100)
2059 			break;
2060 	}
2061 
2062 	/* Ask the PMU to put us to sleep */
2063 	pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
2064 	pmu_wait_complete(&sleep_req);
2065 	pmu_unlock();
2066 
2067 	pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 1);
2068 
2069 	asleep = 1;
2070 
2071 	/* Put the CPU into sleep mode */
2072 	hid0 = mfspr(SPRN_HID0);
2073 	hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
2074 	mtspr(SPRN_HID0, hid0);
2075 	local_irq_enable();
2076 	msr = mfmsr() | MSR_POW;
2077 	while (asleep) {
2078 		mb();
2079 		mtmsr(msr);
2080 		isync();
2081 	}
2082 	local_irq_disable();
2083 
2084 	/* OK, we're awake again, start restoring things */
2085 	out_be32(mem_ctrl_sleep, 0x3f);
2086 	pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 0);
2087 
2088 	return 0;
2089 }
2090 
2091 #endif /* CONFIG_SUSPEND && CONFIG_PPC32 */
2092 
2093 /*
2094  * Support for /dev/pmu device
2095  */
2096 #define RB_SIZE		0x10
2097 struct pmu_private {
2098 	struct list_head list;
2099 	int	rb_get;
2100 	int	rb_put;
2101 	struct rb_entry {
2102 		unsigned short len;
2103 		unsigned char data[16];
2104 	}	rb_buf[RB_SIZE];
2105 	wait_queue_head_t wait;
2106 	spinlock_t lock;
2107 #if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
2108 	int	backlight_locker;
2109 #endif
2110 };
2111 
2112 static LIST_HEAD(all_pmu_pvt);
2113 static DEFINE_SPINLOCK(all_pvt_lock);
2114 
2115 static void
pmu_pass_intr(unsigned char * data,int len)2116 pmu_pass_intr(unsigned char *data, int len)
2117 {
2118 	struct pmu_private *pp;
2119 	struct list_head *list;
2120 	int i;
2121 	unsigned long flags;
2122 
2123 	if (len > sizeof(pp->rb_buf[0].data))
2124 		len = sizeof(pp->rb_buf[0].data);
2125 	spin_lock_irqsave(&all_pvt_lock, flags);
2126 	for (list = &all_pmu_pvt; (list = list->next) != &all_pmu_pvt; ) {
2127 		pp = list_entry(list, struct pmu_private, list);
2128 		spin_lock(&pp->lock);
2129 		i = pp->rb_put + 1;
2130 		if (i >= RB_SIZE)
2131 			i = 0;
2132 		if (i != pp->rb_get) {
2133 			struct rb_entry *rp = &pp->rb_buf[pp->rb_put];
2134 			rp->len = len;
2135 			memcpy(rp->data, data, len);
2136 			pp->rb_put = i;
2137 			wake_up_interruptible(&pp->wait);
2138 		}
2139 		spin_unlock(&pp->lock);
2140 	}
2141 	spin_unlock_irqrestore(&all_pvt_lock, flags);
2142 }
2143 
2144 static int
pmu_open(struct inode * inode,struct file * file)2145 pmu_open(struct inode *inode, struct file *file)
2146 {
2147 	struct pmu_private *pp;
2148 	unsigned long flags;
2149 
2150 	pp = kmalloc(sizeof(struct pmu_private), GFP_KERNEL);
2151 	if (!pp)
2152 		return -ENOMEM;
2153 	pp->rb_get = pp->rb_put = 0;
2154 	spin_lock_init(&pp->lock);
2155 	init_waitqueue_head(&pp->wait);
2156 	mutex_lock(&pmu_info_proc_mutex);
2157 	spin_lock_irqsave(&all_pvt_lock, flags);
2158 #if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
2159 	pp->backlight_locker = 0;
2160 #endif
2161 	list_add(&pp->list, &all_pmu_pvt);
2162 	spin_unlock_irqrestore(&all_pvt_lock, flags);
2163 	file->private_data = pp;
2164 	mutex_unlock(&pmu_info_proc_mutex);
2165 	return 0;
2166 }
2167 
2168 static ssize_t
pmu_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)2169 pmu_read(struct file *file, char __user *buf,
2170 			size_t count, loff_t *ppos)
2171 {
2172 	struct pmu_private *pp = file->private_data;
2173 	DECLARE_WAITQUEUE(wait, current);
2174 	unsigned long flags;
2175 	int ret = 0;
2176 
2177 	if (count < 1 || !pp)
2178 		return -EINVAL;
2179 
2180 	spin_lock_irqsave(&pp->lock, flags);
2181 	add_wait_queue(&pp->wait, &wait);
2182 	set_current_state(TASK_INTERRUPTIBLE);
2183 
2184 	for (;;) {
2185 		ret = -EAGAIN;
2186 		if (pp->rb_get != pp->rb_put) {
2187 			int i = pp->rb_get;
2188 			struct rb_entry *rp = &pp->rb_buf[i];
2189 			ret = rp->len;
2190 			spin_unlock_irqrestore(&pp->lock, flags);
2191 			if (ret > count)
2192 				ret = count;
2193 			if (ret > 0 && copy_to_user(buf, rp->data, ret))
2194 				ret = -EFAULT;
2195 			if (++i >= RB_SIZE)
2196 				i = 0;
2197 			spin_lock_irqsave(&pp->lock, flags);
2198 			pp->rb_get = i;
2199 		}
2200 		if (ret >= 0)
2201 			break;
2202 		if (file->f_flags & O_NONBLOCK)
2203 			break;
2204 		ret = -ERESTARTSYS;
2205 		if (signal_pending(current))
2206 			break;
2207 		spin_unlock_irqrestore(&pp->lock, flags);
2208 		schedule();
2209 		spin_lock_irqsave(&pp->lock, flags);
2210 	}
2211 	__set_current_state(TASK_RUNNING);
2212 	remove_wait_queue(&pp->wait, &wait);
2213 	spin_unlock_irqrestore(&pp->lock, flags);
2214 
2215 	return ret;
2216 }
2217 
2218 static ssize_t
pmu_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)2219 pmu_write(struct file *file, const char __user *buf,
2220 			 size_t count, loff_t *ppos)
2221 {
2222 	return 0;
2223 }
2224 
2225 static __poll_t
pmu_fpoll(struct file * filp,poll_table * wait)2226 pmu_fpoll(struct file *filp, poll_table *wait)
2227 {
2228 	struct pmu_private *pp = filp->private_data;
2229 	__poll_t mask = 0;
2230 	unsigned long flags;
2231 
2232 	if (!pp)
2233 		return 0;
2234 	poll_wait(filp, &pp->wait, wait);
2235 	spin_lock_irqsave(&pp->lock, flags);
2236 	if (pp->rb_get != pp->rb_put)
2237 		mask |= EPOLLIN;
2238 	spin_unlock_irqrestore(&pp->lock, flags);
2239 	return mask;
2240 }
2241 
2242 static int
pmu_release(struct inode * inode,struct file * file)2243 pmu_release(struct inode *inode, struct file *file)
2244 {
2245 	struct pmu_private *pp = file->private_data;
2246 	unsigned long flags;
2247 
2248 	if (pp) {
2249 		file->private_data = NULL;
2250 		spin_lock_irqsave(&all_pvt_lock, flags);
2251 		list_del(&pp->list);
2252 		spin_unlock_irqrestore(&all_pvt_lock, flags);
2253 
2254 #if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
2255 		if (pp->backlight_locker)
2256 			pmac_backlight_enable();
2257 #endif
2258 
2259 		kfree(pp);
2260 	}
2261 	return 0;
2262 }
2263 
2264 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
pmac_suspend_disable_irqs(void)2265 static void pmac_suspend_disable_irqs(void)
2266 {
2267 	/* Call platform functions marked "on sleep" */
2268 	pmac_pfunc_i2c_suspend();
2269 	pmac_pfunc_base_suspend();
2270 }
2271 
powerbook_sleep(suspend_state_t state)2272 static int powerbook_sleep(suspend_state_t state)
2273 {
2274 	int error = 0;
2275 
2276 	/* Wait for completion of async requests */
2277 	while (!batt_req.complete)
2278 		pmu_poll();
2279 
2280 	/* Giveup the lazy FPU & vec so we don't have to back them
2281 	 * up from the low level code
2282 	 */
2283 	enable_kernel_fp();
2284 
2285 #ifdef CONFIG_ALTIVEC
2286 	if (cpu_has_feature(CPU_FTR_ALTIVEC))
2287 		enable_kernel_altivec();
2288 #endif /* CONFIG_ALTIVEC */
2289 
2290 	switch (pmu_kind) {
2291 	case PMU_OHARE_BASED:
2292 		error = powerbook_sleep_3400();
2293 		break;
2294 	case PMU_HEATHROW_BASED:
2295 	case PMU_PADDINGTON_BASED:
2296 		error = powerbook_sleep_grackle();
2297 		break;
2298 	case PMU_KEYLARGO_BASED:
2299 		error = powerbook_sleep_Core99();
2300 		break;
2301 	default:
2302 		return -ENOSYS;
2303 	}
2304 
2305 	if (error)
2306 		return error;
2307 
2308 	mdelay(100);
2309 
2310 	return 0;
2311 }
2312 
pmac_suspend_enable_irqs(void)2313 static void pmac_suspend_enable_irqs(void)
2314 {
2315 	/* Force a poll of ADB interrupts */
2316 	adb_int_pending = 1;
2317 	via_pmu_interrupt(0, NULL);
2318 
2319 	mdelay(10);
2320 
2321 	/* Call platform functions marked "on wake" */
2322 	pmac_pfunc_base_resume();
2323 	pmac_pfunc_i2c_resume();
2324 }
2325 
pmu_sleep_valid(suspend_state_t state)2326 static int pmu_sleep_valid(suspend_state_t state)
2327 {
2328 	return state == PM_SUSPEND_MEM
2329 		&& (pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, -1) >= 0);
2330 }
2331 
2332 static const struct platform_suspend_ops pmu_pm_ops = {
2333 	.enter = powerbook_sleep,
2334 	.valid = pmu_sleep_valid,
2335 };
2336 
register_pmu_pm_ops(void)2337 static int register_pmu_pm_ops(void)
2338 {
2339 	if (pmu_kind == PMU_OHARE_BASED)
2340 		powerbook_sleep_init_3400();
2341 	ppc_md.suspend_disable_irqs = pmac_suspend_disable_irqs;
2342 	ppc_md.suspend_enable_irqs = pmac_suspend_enable_irqs;
2343 	suspend_set_ops(&pmu_pm_ops);
2344 
2345 	return 0;
2346 }
2347 
2348 device_initcall(register_pmu_pm_ops);
2349 #endif
2350 
pmu_ioctl(struct file * filp,u_int cmd,u_long arg)2351 static int pmu_ioctl(struct file *filp,
2352 		     u_int cmd, u_long arg)
2353 {
2354 	__u32 __user *argp = (__u32 __user *)arg;
2355 	int error = -EINVAL;
2356 
2357 	switch (cmd) {
2358 #ifdef CONFIG_PPC_PMAC
2359 	case PMU_IOC_SLEEP:
2360 		if (!capable(CAP_SYS_ADMIN))
2361 			return -EACCES;
2362 		return pm_suspend(PM_SUSPEND_MEM);
2363 	case PMU_IOC_CAN_SLEEP:
2364 		if (pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, -1) < 0)
2365 			return put_user(0, argp);
2366 		else
2367 			return put_user(1, argp);
2368 #endif
2369 
2370 #ifdef CONFIG_PMAC_BACKLIGHT_LEGACY
2371 	/* Compatibility ioctl's for backlight */
2372 	case PMU_IOC_GET_BACKLIGHT:
2373 	{
2374 		int brightness;
2375 
2376 		brightness = pmac_backlight_get_legacy_brightness();
2377 		if (brightness < 0)
2378 			return brightness;
2379 		else
2380 			return put_user(brightness, argp);
2381 
2382 	}
2383 	case PMU_IOC_SET_BACKLIGHT:
2384 	{
2385 		int brightness;
2386 
2387 		error = get_user(brightness, argp);
2388 		if (error)
2389 			return error;
2390 
2391 		return pmac_backlight_set_legacy_brightness(brightness);
2392 	}
2393 #ifdef CONFIG_INPUT_ADBHID
2394 	case PMU_IOC_GRAB_BACKLIGHT: {
2395 		struct pmu_private *pp = filp->private_data;
2396 
2397 		if (pp->backlight_locker)
2398 			return 0;
2399 
2400 		pp->backlight_locker = 1;
2401 		pmac_backlight_disable();
2402 
2403 		return 0;
2404 	}
2405 #endif /* CONFIG_INPUT_ADBHID */
2406 #endif /* CONFIG_PMAC_BACKLIGHT_LEGACY */
2407 
2408 	case PMU_IOC_GET_MODEL:
2409 	    	return put_user(pmu_kind, argp);
2410 	case PMU_IOC_HAS_ADB:
2411 		return put_user(pmu_has_adb, argp);
2412 	}
2413 	return error;
2414 }
2415 
pmu_unlocked_ioctl(struct file * filp,u_int cmd,u_long arg)2416 static long pmu_unlocked_ioctl(struct file *filp,
2417 			       u_int cmd, u_long arg)
2418 {
2419 	int ret;
2420 
2421 	mutex_lock(&pmu_info_proc_mutex);
2422 	ret = pmu_ioctl(filp, cmd, arg);
2423 	mutex_unlock(&pmu_info_proc_mutex);
2424 
2425 	return ret;
2426 }
2427 
2428 #ifdef CONFIG_COMPAT
2429 #define PMU_IOC_GET_BACKLIGHT32	_IOR('B', 1, compat_size_t)
2430 #define PMU_IOC_SET_BACKLIGHT32	_IOW('B', 2, compat_size_t)
2431 #define PMU_IOC_GET_MODEL32	_IOR('B', 3, compat_size_t)
2432 #define PMU_IOC_HAS_ADB32	_IOR('B', 4, compat_size_t)
2433 #define PMU_IOC_CAN_SLEEP32	_IOR('B', 5, compat_size_t)
2434 #define PMU_IOC_GRAB_BACKLIGHT32 _IOR('B', 6, compat_size_t)
2435 
compat_pmu_ioctl(struct file * filp,u_int cmd,u_long arg)2436 static long compat_pmu_ioctl (struct file *filp, u_int cmd, u_long arg)
2437 {
2438 	switch (cmd) {
2439 	case PMU_IOC_SLEEP:
2440 		break;
2441 	case PMU_IOC_GET_BACKLIGHT32:
2442 		cmd = PMU_IOC_GET_BACKLIGHT;
2443 		break;
2444 	case PMU_IOC_SET_BACKLIGHT32:
2445 		cmd = PMU_IOC_SET_BACKLIGHT;
2446 		break;
2447 	case PMU_IOC_GET_MODEL32:
2448 		cmd = PMU_IOC_GET_MODEL;
2449 		break;
2450 	case PMU_IOC_HAS_ADB32:
2451 		cmd = PMU_IOC_HAS_ADB;
2452 		break;
2453 	case PMU_IOC_CAN_SLEEP32:
2454 		cmd = PMU_IOC_CAN_SLEEP;
2455 		break;
2456 	case PMU_IOC_GRAB_BACKLIGHT32:
2457 		cmd = PMU_IOC_GRAB_BACKLIGHT;
2458 		break;
2459 	default:
2460 		return -ENOIOCTLCMD;
2461 	}
2462 	return pmu_unlocked_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2463 }
2464 #endif
2465 
2466 static const struct file_operations pmu_device_fops = {
2467 	.read		= pmu_read,
2468 	.write		= pmu_write,
2469 	.poll		= pmu_fpoll,
2470 	.unlocked_ioctl	= pmu_unlocked_ioctl,
2471 #ifdef CONFIG_COMPAT
2472 	.compat_ioctl	= compat_pmu_ioctl,
2473 #endif
2474 	.open		= pmu_open,
2475 	.release	= pmu_release,
2476 	.llseek		= noop_llseek,
2477 };
2478 
2479 static struct miscdevice pmu_device = {
2480 	PMU_MINOR, "pmu", &pmu_device_fops
2481 };
2482 
pmu_device_init(void)2483 static int pmu_device_init(void)
2484 {
2485 	if (pmu_state == uninitialized)
2486 		return 0;
2487 	if (misc_register(&pmu_device) < 0)
2488 		printk(KERN_ERR "via-pmu: cannot register misc device.\n");
2489 	return 0;
2490 }
2491 device_initcall(pmu_device_init);
2492 
2493 
2494 #ifdef DEBUG_SLEEP
2495 static inline void
polled_handshake(void)2496 polled_handshake(void)
2497 {
2498 	via2[B] &= ~TREQ; eieio();
2499 	while ((via2[B] & TACK) != 0)
2500 		;
2501 	via2[B] |= TREQ; eieio();
2502 	while ((via2[B] & TACK) == 0)
2503 		;
2504 }
2505 
2506 static inline void
polled_send_byte(int x)2507 polled_send_byte(int x)
2508 {
2509 	via1[ACR] |= SR_OUT | SR_EXT; eieio();
2510 	via1[SR] = x; eieio();
2511 	polled_handshake();
2512 }
2513 
2514 static inline int
polled_recv_byte(void)2515 polled_recv_byte(void)
2516 {
2517 	int x;
2518 
2519 	via1[ACR] = (via1[ACR] & ~SR_OUT) | SR_EXT; eieio();
2520 	x = via1[SR]; eieio();
2521 	polled_handshake();
2522 	x = via1[SR]; eieio();
2523 	return x;
2524 }
2525 
2526 int
pmu_polled_request(struct adb_request * req)2527 pmu_polled_request(struct adb_request *req)
2528 {
2529 	unsigned long flags;
2530 	int i, l, c;
2531 
2532 	req->complete = 1;
2533 	c = req->data[0];
2534 	l = pmu_data_len[c][0];
2535 	if (l >= 0 && req->nbytes != l + 1)
2536 		return -EINVAL;
2537 
2538 	local_irq_save(flags);
2539 	while (pmu_state != idle)
2540 		pmu_poll();
2541 
2542 	while ((via2[B] & TACK) == 0)
2543 		;
2544 	polled_send_byte(c);
2545 	if (l < 0) {
2546 		l = req->nbytes - 1;
2547 		polled_send_byte(l);
2548 	}
2549 	for (i = 1; i <= l; ++i)
2550 		polled_send_byte(req->data[i]);
2551 
2552 	l = pmu_data_len[c][1];
2553 	if (l < 0)
2554 		l = polled_recv_byte();
2555 	for (i = 0; i < l; ++i)
2556 		req->reply[i + req->reply_len] = polled_recv_byte();
2557 
2558 	if (req->done)
2559 		(*req->done)(req);
2560 
2561 	local_irq_restore(flags);
2562 	return 0;
2563 }
2564 
2565 /* N.B. This doesn't work on the 3400 */
pmu_blink(int n)2566 void pmu_blink(int n)
2567 {
2568 	struct adb_request req;
2569 
2570 	memset(&req, 0, sizeof(req));
2571 
2572 	for (; n > 0; --n) {
2573 		req.nbytes = 4;
2574 		req.done = NULL;
2575 		req.data[0] = 0xee;
2576 		req.data[1] = 4;
2577 		req.data[2] = 0;
2578 		req.data[3] = 1;
2579 		req.reply[0] = ADB_RET_OK;
2580 		req.reply_len = 1;
2581 		req.reply_expected = 0;
2582 		pmu_polled_request(&req);
2583 		mdelay(50);
2584 		req.nbytes = 4;
2585 		req.done = NULL;
2586 		req.data[0] = 0xee;
2587 		req.data[1] = 4;
2588 		req.data[2] = 0;
2589 		req.data[3] = 0;
2590 		req.reply[0] = ADB_RET_OK;
2591 		req.reply_len = 1;
2592 		req.reply_expected = 0;
2593 		pmu_polled_request(&req);
2594 		mdelay(50);
2595 	}
2596 	mdelay(50);
2597 }
2598 #endif /* DEBUG_SLEEP */
2599 
2600 #if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
2601 int pmu_sys_suspended;
2602 
pmu_syscore_suspend(void)2603 static int pmu_syscore_suspend(void)
2604 {
2605 	/* Suspend PMU event interrupts */
2606 	pmu_suspend();
2607 	pmu_sys_suspended = 1;
2608 
2609 #ifdef CONFIG_PMAC_BACKLIGHT
2610 	/* Tell backlight code not to muck around with the chip anymore */
2611 	pmu_backlight_set_sleep(1);
2612 #endif
2613 
2614 	return 0;
2615 }
2616 
pmu_syscore_resume(void)2617 static void pmu_syscore_resume(void)
2618 {
2619 	struct adb_request req;
2620 
2621 	if (!pmu_sys_suspended)
2622 		return;
2623 
2624 	/* Tell PMU we are ready */
2625 	pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
2626 	pmu_wait_complete(&req);
2627 
2628 #ifdef CONFIG_PMAC_BACKLIGHT
2629 	/* Tell backlight code it can use the chip again */
2630 	pmu_backlight_set_sleep(0);
2631 #endif
2632 	/* Resume PMU event interrupts */
2633 	pmu_resume();
2634 	pmu_sys_suspended = 0;
2635 }
2636 
2637 static struct syscore_ops pmu_syscore_ops = {
2638 	.suspend = pmu_syscore_suspend,
2639 	.resume = pmu_syscore_resume,
2640 };
2641 
pmu_syscore_register(void)2642 static int pmu_syscore_register(void)
2643 {
2644 	register_syscore_ops(&pmu_syscore_ops);
2645 
2646 	return 0;
2647 }
2648 subsys_initcall(pmu_syscore_register);
2649 #endif /* CONFIG_SUSPEND && CONFIG_PPC32 */
2650 
2651 EXPORT_SYMBOL(pmu_request);
2652 EXPORT_SYMBOL(pmu_queue_request);
2653 EXPORT_SYMBOL(pmu_poll);
2654 EXPORT_SYMBOL(pmu_poll_adb);
2655 EXPORT_SYMBOL(pmu_wait_complete);
2656 EXPORT_SYMBOL(pmu_suspend);
2657 EXPORT_SYMBOL(pmu_resume);
2658 EXPORT_SYMBOL(pmu_unlock);
2659 #if defined(CONFIG_PPC32)
2660 EXPORT_SYMBOL(pmu_enable_irled);
2661 EXPORT_SYMBOL(pmu_battery_count);
2662 EXPORT_SYMBOL(pmu_batteries);
2663 EXPORT_SYMBOL(pmu_power_flags);
2664 #endif /* CONFIG_SUSPEND && CONFIG_PPC32 */
2665 
2666