time.c (5d14a18d59b661356409e5a1f624236155a209ba) time.c (35499c0195e46f479cf6ac16ad8d3f394b5fcc10)
1/*
2 * Support for periodic interrupts (100 per second) and for getting
3 * the current time from the RTC on Power Macintoshes.
4 *
5 * We use the decrementer register for our periodic interrupts.
6 *
7 * Paul Mackerras August 1996.
8 * Copyright (C) 1996 Paul Mackerras.

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28#include <asm/sections.h>
29#include <asm/prom.h>
30#include <asm/system.h>
31#include <asm/io.h>
32#include <asm/pgtable.h>
33#include <asm/machdep.h>
34#include <asm/time.h>
35#include <asm/nvram.h>
1/*
2 * Support for periodic interrupts (100 per second) and for getting
3 * the current time from the RTC on Power Macintoshes.
4 *
5 * We use the decrementer register for our periodic interrupts.
6 *
7 * Paul Mackerras August 1996.
8 * Copyright (C) 1996 Paul Mackerras.

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28#include <asm/sections.h>
29#include <asm/prom.h>
30#include <asm/system.h>
31#include <asm/io.h>
32#include <asm/pgtable.h>
33#include <asm/machdep.h>
34#include <asm/time.h>
35#include <asm/nvram.h>
36#include <asm/smu.h>
36
37#undef DEBUG
38
39#ifdef DEBUG
40#define DBG(x...) printk(x)
41#else
42#define DBG(x...)
43#endif

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63#define T1MODE 0xc0 /* Timer 1 mode */
64#define T1MODE_CONT 0x40 /* continuous interrupts */
65
66/* Bits in IFR and IER */
67#define T1_INT 0x40 /* Timer 1 interrupt */
68
69long __init pmac_time_init(void)
70{
37
38#undef DEBUG
39
40#ifdef DEBUG
41#define DBG(x...) printk(x)
42#else
43#define DBG(x...)
44#endif

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64#define T1MODE 0xc0 /* Timer 1 mode */
65#define T1MODE_CONT 0x40 /* continuous interrupts */
66
67/* Bits in IFR and IER */
68#define T1_INT 0x40 /* Timer 1 interrupt */
69
70long __init pmac_time_init(void)
71{
71#ifdef CONFIG_NVRAM
72 s32 delta = 0;
72 s32 delta = 0;
73#ifdef CONFIG_NVRAM
73 int dst;
74
75 delta = ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x9)) << 16;
76 delta |= ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xa)) << 8;
77 delta |= pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xb);
78 if (delta & 0x00800000UL)
79 delta |= 0xFF000000UL;
80 dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
81 printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
82 dst ? "on" : "off");
74 int dst;
75
76 delta = ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x9)) << 16;
77 delta |= ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xa)) << 8;
78 delta |= pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xb);
79 if (delta & 0x00800000UL)
80 delta |= 0xFF000000UL;
81 dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
82 printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
83 dst ? "on" : "off");
83 return delta;
84#else
85 return 0;
86#endif
84#endif
85 return delta;
87}
88
86}
87
89unsigned long pmac_get_boot_time(void)
88static void to_rtc_time(unsigned long now, struct rtc_time *tm)
90{
89{
91#if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU)
90 to_tm(now, tm);
91 tm->tm_year -= 1900;
92 tm->tm_mon -= 1;
93}
94
95static unsigned long from_rtc_time(struct rtc_time *tm)
96{
97 return mktime(tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
98 tm->tm_hour, tm->tm_min, tm->tm_sec);
99}
100
101#ifdef CONFIG_ADB_CUDA
102static unsigned long cuda_get_time(void)
103{
92 struct adb_request req;
93 unsigned long now;
104 struct adb_request req;
105 unsigned long now;
94#endif
95
106
96 /* Get the time from the RTC */
97 switch (sys_ctrler) {
98#ifdef CONFIG_ADB_CUDA
99 case SYS_CTRLER_CUDA:
100 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
101 return 0;
102 while (!req.complete)
103 cuda_poll();
104 if (req.reply_len != 7)
105 printk(KERN_ERR "pmac_get_rtc_time: got %d byte reply\n",
106 req.reply_len);
107 now = (req.reply[3] << 24) + (req.reply[4] << 16)
108 + (req.reply[5] << 8) + req.reply[6];
109 return now - RTC_OFFSET;
110#endif /* CONFIG_ADB_CUDA */
111#ifdef CONFIG_ADB_PMU
112 case SYS_CTRLER_PMU:
113 if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
114 return 0;
115 while (!req.complete)
116 pmu_poll();
117 if (req.reply_len != 4)
118 printk(KERN_ERR "pmac_get_rtc_time: got %d byte reply\n",
119 req.reply_len);
120 now = (req.reply[0] << 24) + (req.reply[1] << 16)
121 + (req.reply[2] << 8) + req.reply[3];
122 return now - RTC_OFFSET;
123#endif /* CONFIG_ADB_PMU */
124 default: ;
125 }
107 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
108 return 0;
109 while (!req.complete)
110 cuda_poll();
111 if (req.reply_len != 7)
112 printk(KERN_ERR "cuda_get_time: got %d byte reply\n",
113 req.reply_len);
114 now = (req.reply[3] << 24) + (req.reply[4] << 16)
115 + (req.reply[5] << 8) + req.reply[6];
116 if (now < RTC_OFFSET)
117 return 0;
118 return now - RTC_OFFSET;
119}
120
121#define cuda_get_rtc_time(tm) to_rtc_time(cuda_get_time(), (tm))
122
123static int cuda_set_rtc_time(struct rtc_time *tm)
124{
125 unsigned int nowtime;
126 struct adb_request req;
127
128 nowtime = from_rtc_time(tm) + RTC_OFFSET;
129 if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
130 nowtime >> 24, nowtime >> 16, nowtime >> 8,
131 nowtime) < 0)
132 return -ENXIO;
133 while (!req.complete)
134 cuda_poll();
135 if ((req.reply_len != 3) && (req.reply_len != 7))
136 printk(KERN_ERR "cuda_set_rtc_time: got %d byte reply\n",
137 req.reply_len);
126 return 0;
127}
128
138 return 0;
139}
140
129void pmac_get_rtc_time(struct rtc_time *tm)
141#else
142#define cuda_get_time() 0
143#define cuda_get_rtc_time(tm)
144#define cuda_set_rtc_time(tm) 0
145#endif
146
147#ifdef CONFIG_ADB_PMU
148static unsigned long pmu_get_time(void)
130{
149{
150 struct adb_request req;
131 unsigned long now;
132
151 unsigned long now;
152
133 now = pmac_get_boot_time();
134 to_tm(now, tm);
135 tm->tm_year -= 1900;
136 tm->tm_mon -= 1; /* month is 0-based */
153 if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
154 return 0;
155 pmu_wait_complete(&req);
156 if (req.reply_len != 4)
157 printk(KERN_ERR "pmu_get_time: got %d byte reply from PMU\n",
158 req.reply_len);
159 now = (req.reply[0] << 24) + (req.reply[1] << 16)
160 + (req.reply[2] << 8) + req.reply[3];
161 if (now < RTC_OFFSET)
162 return 0;
163 return now - RTC_OFFSET;
137}
138
164}
165
139int pmac_set_rtc_time(struct rtc_time *tm)
166#define pmu_get_rtc_time(tm) to_rtc_time(pmu_get_time(), (tm))
167
168static int pmu_set_rtc_time(struct rtc_time *tm)
140{
169{
141 unsigned long nowtime;
142#if defined(CONFIG_ADB_CUDA) || defined(CONFIG_ADB_PMU)
170 unsigned int nowtime;
143 struct adb_request req;
171 struct adb_request req;
172
173 nowtime = from_rtc_time(tm) + RTC_OFFSET;
174 if (pmu_request(&req, NULL, 5, PMU_SET_RTC, nowtime >> 24,
175 nowtime >> 16, nowtime >> 8, nowtime) < 0)
176 return -ENXIO;
177 pmu_wait_complete(&req);
178 if (req.reply_len != 0)
179 printk(KERN_ERR "pmu_set_rtc_time: %d byte reply from PMU\n",
180 req.reply_len);
181 return 0;
182}
183
184#else
185#define pmu_get_time() 0
186#define pmu_get_rtc_time(tm)
187#define pmu_set_rtc_time(tm) 0
144#endif
145
188#endif
189
146 nowtime = mktime(tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
147 tm->tm_hour, tm->tm_min, tm->tm_sec);
148 nowtime += RTC_OFFSET;
190#ifdef CONFIG_PMAC_SMU
191static unsigned long smu_get_time(void)
192{
193 struct rtc_time tm;
149
194
195 if (smu_get_rtc_time(&tm, 1))
196 return 0;
197 return from_rtc_time(&tm);
198}
199
200#else
201#define smu_get_time() 0
202#define smu_get_rtc_time(tm, spin)
203#define smu_set_rtc_time(tm, spin) 0
204#endif
205
206unsigned long pmac_get_boot_time(void)
207{
208 /* Get the time from the RTC, used only at boot time */
150 switch (sys_ctrler) {
209 switch (sys_ctrler) {
151#ifdef CONFIG_ADB_CUDA
152 case SYS_CTRLER_CUDA:
210 case SYS_CTRLER_CUDA:
153 if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
154 nowtime >> 24, nowtime >> 16, nowtime >> 8,
155 nowtime) < 0)
156 return 0;
157 while (!req.complete)
158 cuda_poll();
159 if ((req.reply_len != 3) && (req.reply_len != 7))
160 printk(KERN_ERR "pmac_set_rtc_time: got %d byte reply\n",
161 req.reply_len);
162 return 1;
163#endif /* CONFIG_ADB_CUDA */
164#ifdef CONFIG_ADB_PMU
211 return cuda_get_time();
165 case SYS_CTRLER_PMU:
212 case SYS_CTRLER_PMU:
166 if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
167 nowtime >> 24, nowtime >> 16, nowtime >> 8, nowtime) < 0)
168 return 0;
169 while (!req.complete)
170 pmu_poll();
171 if (req.reply_len != 0)
172 printk(KERN_ERR "pmac_set_rtc_time: got %d byte reply\n",
173 req.reply_len);
174 return 1;
175#endif /* CONFIG_ADB_PMU */
213 return pmu_get_time();
214 case SYS_CTRLER_SMU:
215 return smu_get_time();
176 default:
177 return 0;
178 }
179}
180
216 default:
217 return 0;
218 }
219}
220
221void pmac_get_rtc_time(struct rtc_time *tm)
222{
223 /* Get the time from the RTC, used only at boot time */
224 switch (sys_ctrler) {
225 case SYS_CTRLER_CUDA:
226 cuda_get_rtc_time(tm);
227 break;
228 case SYS_CTRLER_PMU:
229 pmu_get_rtc_time(tm);
230 break;
231 case SYS_CTRLER_SMU:
232 smu_get_rtc_time(tm, 1);
233 break;
234 default:
235 ;
236 }
237}
238
239int pmac_set_rtc_time(struct rtc_time *tm)
240{
241 switch (sys_ctrler) {
242 case SYS_CTRLER_CUDA:
243 return cuda_set_rtc_time(tm);
244 case SYS_CTRLER_PMU:
245 return pmu_set_rtc_time(tm);
246 case SYS_CTRLER_SMU:
247 return smu_set_rtc_time(tm, 1);
248 default:
249 return -ENODEV;
250 }
251}
252
253#ifdef CONFIG_PPC32
181/*
182 * Calibrate the decrementer register using VIA timer 1.
183 * This is used both on powermacs and CHRP machines.
184 */
254/*
255 * Calibrate the decrementer register using VIA timer 1.
256 * This is used both on powermacs and CHRP machines.
257 */
185int __init
186via_calibrate_decr(void)
258int __init via_calibrate_decr(void)
187{
188 struct device_node *vias;
189 volatile unsigned char __iomem *via;
190 int count = VIA_TIMER_FREQ_6 / 100;
191 unsigned int dstart, dend;
192
193 vias = find_devices("via-cuda");
194 if (vias == 0)

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212 dstart = get_dec();
213 /* clear the interrupt & wait until it hits 0 again */
214 in_8(&via[T1CL]);
215 while ((in_8(&via[IFR]) & T1_INT) == 0)
216 ;
217 dend = get_dec();
218
219 ppc_tb_freq = (dstart - dend) * 100 / 6;
259{
260 struct device_node *vias;
261 volatile unsigned char __iomem *via;
262 int count = VIA_TIMER_FREQ_6 / 100;
263 unsigned int dstart, dend;
264
265 vias = find_devices("via-cuda");
266 if (vias == 0)

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284 dstart = get_dec();
285 /* clear the interrupt & wait until it hits 0 again */
286 in_8(&via[T1CL]);
287 while ((in_8(&via[IFR]) & T1_INT) == 0)
288 ;
289 dend = get_dec();
290
291 ppc_tb_freq = (dstart - dend) * 100 / 6;
220 tb_ticks_per_jiffy = (dstart - dend) / ((6 * HZ)/100);
221
292
222 printk(KERN_INFO "via_calibrate_decr: ticks per jiffy = %lu (%u ticks)\n",
223 tb_ticks_per_jiffy, dstart - dend);
224
225 iounmap(via);
226
227 return 1;
228}
293 iounmap(via);
294
295 return 1;
296}
297#endif
229
230#ifdef CONFIG_PM
231/*
232 * Reset the time after a sleep.
233 */
234static int
235time_sleep_notify(struct pmu_sleep_notifier *self, int when)
236{

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257
258static struct pmu_sleep_notifier time_sleep_notifier = {
259 time_sleep_notify, SLEEP_LEVEL_MISC,
260};
261#endif /* CONFIG_PM */
262
263/*
264 * Query the OF and get the decr frequency.
298
299#ifdef CONFIG_PM
300/*
301 * Reset the time after a sleep.
302 */
303static int
304time_sleep_notify(struct pmu_sleep_notifier *self, int when)
305{

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326
327static struct pmu_sleep_notifier time_sleep_notifier = {
328 time_sleep_notify, SLEEP_LEVEL_MISC,
329};
330#endif /* CONFIG_PM */
331
332/*
333 * Query the OF and get the decr frequency.
265 * This was taken from the pmac time_init() when merging the prep/pmac
266 * time functions.
267 */
334 */
268void __init
269pmac_calibrate_decr(void)
335void __init pmac_calibrate_decr(void)
270{
336{
271 struct device_node *cpu;
272 unsigned int freq, *fp;
273
274#ifdef CONFIG_PM
337#ifdef CONFIG_PM
338 /* XXX why here? */
275 pmu_register_sleep_notifier(&time_sleep_notifier);
276#endif /* CONFIG_PM */
277
339 pmu_register_sleep_notifier(&time_sleep_notifier);
340#endif /* CONFIG_PM */
341
342 generic_calibrate_decr();
343
344#ifdef CONFIG_PPC32
278 /* We assume MacRISC2 machines have correct device-tree
279 * calibration. That's better since the VIA itself seems
280 * to be slightly off. --BenH
281 */
282 if (!machine_is_compatible("MacRISC2") &&
283 !machine_is_compatible("MacRISC3") &&
284 !machine_is_compatible("MacRISC4"))
285 if (via_calibrate_decr())
286 return;
287
288 /* Special case: QuickSilver G4s seem to have a badly calibrated
289 * timebase-frequency in OF, VIA is much better on these. We should
290 * probably implement calibration based on the KL timer on these
291 * machines anyway... -BenH
292 */
293 if (machine_is_compatible("PowerMac3,5"))
294 if (via_calibrate_decr())
295 return;
345 /* We assume MacRISC2 machines have correct device-tree
346 * calibration. That's better since the VIA itself seems
347 * to be slightly off. --BenH
348 */
349 if (!machine_is_compatible("MacRISC2") &&
350 !machine_is_compatible("MacRISC3") &&
351 !machine_is_compatible("MacRISC4"))
352 if (via_calibrate_decr())
353 return;
354
355 /* Special case: QuickSilver G4s seem to have a badly calibrated
356 * timebase-frequency in OF, VIA is much better on these. We should
357 * probably implement calibration based on the KL timer on these
358 * machines anyway... -BenH
359 */
360 if (machine_is_compatible("PowerMac3,5"))
361 if (via_calibrate_decr())
362 return;
296 /*
297 * The cpu node should have a timebase-frequency property
298 * to tell us the rate at which the decrementer counts.
299 */
300 cpu = find_type_devices("cpu");
301 if (cpu == 0)
302 panic("can't find cpu node in time_init");
303 fp = (unsigned int *) get_property(cpu, "timebase-frequency", NULL);
304 if (fp == 0)
305 panic("can't get cpu timebase frequency");
306 freq = *fp;
307 printk("time_init: decrementer frequency = %u.%.6u MHz\n",
308 freq/1000000, freq%1000000);
309 ppc_tb_freq = freq;
363#endif
310}
364}