aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ppc64/kernel/pmac_time.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ppc64/kernel/pmac_time.c')
-rw-r--r--arch/ppc64/kernel/pmac_time.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/pmac_time.c b/arch/ppc64/kernel/pmac_time.c
new file mode 100644
index 000000000000..f24827581dd7
--- /dev/null
+++ b/arch/ppc64/kernel/pmac_time.c
@@ -0,0 +1,201 @@
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.
9 * Copyright (C) 2003-2005 Benjamin Herrenschmidt.
10 *
11 */
12#include <linux/config.h>
13#include <linux/errno.h>
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/param.h>
17#include <linux/string.h>
18#include <linux/mm.h>
19#include <linux/init.h>
20#include <linux/time.h>
21#include <linux/adb.h>
22#include <linux/pmu.h>
23#include <linux/interrupt.h>
24
25#include <asm/sections.h>
26#include <asm/prom.h>
27#include <asm/system.h>
28#include <asm/io.h>
29#include <asm/pgtable.h>
30#include <asm/machdep.h>
31#include <asm/time.h>
32#include <asm/nvram.h>
33#include <asm/smu.h>
34
35#undef DEBUG
36
37#ifdef DEBUG
38#define DBG(x...) printk(x)
39#else
40#define DBG(x...)
41#endif
42
43extern void setup_default_decr(void);
44
45extern unsigned long ppc_tb_freq;
46extern unsigned long ppc_proc_freq;
47
48/* Apparently the RTC stores seconds since 1 Jan 1904 */
49#define RTC_OFFSET 2082844800
50
51/*
52 * Calibrate the decrementer frequency with the VIA timer 1.
53 */
54#define VIA_TIMER_FREQ_6 4700000 /* time 1 frequency * 6 */
55
56extern struct timezone sys_tz;
57extern void to_tm(int tim, struct rtc_time * tm);
58
59void __pmac pmac_get_rtc_time(struct rtc_time *tm)
60{
61 switch(sys_ctrler) {
62#ifdef CONFIG_ADB_PMU
63 case SYS_CTRLER_PMU: {
64 /* TODO: Move that to a function in the PMU driver */
65 struct adb_request req;
66 unsigned int now;
67
68 if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
69 return;
70 pmu_wait_complete(&req);
71 if (req.reply_len != 4)
72 printk(KERN_ERR "pmac_get_rtc_time: PMU returned a %d"
73 " bytes reply\n", req.reply_len);
74 now = (req.reply[0] << 24) + (req.reply[1] << 16)
75 + (req.reply[2] << 8) + req.reply[3];
76 DBG("get: %u -> %u\n", (int)now, (int)(now - RTC_OFFSET));
77 now -= RTC_OFFSET;
78
79 to_tm(now, tm);
80 tm->tm_year -= 1900;
81 tm->tm_mon -= 1;
82
83 DBG("-> tm_mday: %d, tm_mon: %d, tm_year: %d, %d:%02d:%02d\n",
84 tm->tm_mday, tm->tm_mon, tm->tm_year,
85 tm->tm_hour, tm->tm_min, tm->tm_sec);
86 break;
87 }
88#endif /* CONFIG_ADB_PMU */
89
90#ifdef CONFIG_PMAC_SMU
91 case SYS_CTRLER_SMU:
92 smu_get_rtc_time(tm);
93 break;
94#endif /* CONFIG_PMAC_SMU */
95 default:
96 ;
97 }
98}
99
100int __pmac pmac_set_rtc_time(struct rtc_time *tm)
101{
102 switch(sys_ctrler) {
103#ifdef CONFIG_ADB_PMU
104 case SYS_CTRLER_PMU: {
105 /* TODO: Move that to a function in the PMU driver */
106 struct adb_request req;
107 unsigned int nowtime;
108
109 DBG("set: tm_mday: %d, tm_mon: %d, tm_year: %d,"
110 " %d:%02d:%02d\n",
111 tm->tm_mday, tm->tm_mon, tm->tm_year,
112 tm->tm_hour, tm->tm_min, tm->tm_sec);
113
114 nowtime = mktime(tm->tm_year + 1900, tm->tm_mon + 1,
115 tm->tm_mday, tm->tm_hour, tm->tm_min,
116 tm->tm_sec);
117
118 DBG("-> %u -> %u\n", (int)nowtime,
119 (int)(nowtime + RTC_OFFSET));
120 nowtime += RTC_OFFSET;
121
122 if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
123 nowtime >> 24, nowtime >> 16,
124 nowtime >> 8, nowtime) < 0)
125 return -ENXIO;
126 pmu_wait_complete(&req);
127 if (req.reply_len != 0)
128 printk(KERN_ERR "pmac_set_rtc_time: PMU returned a %d"
129 " bytes reply\n", req.reply_len);
130 return 0;
131 }
132#endif /* CONFIG_ADB_PMU */
133
134#ifdef CONFIG_PMAC_SMU
135 case SYS_CTRLER_SMU:
136 return smu_set_rtc_time(tm);
137#endif /* CONFIG_PMAC_SMU */
138 default:
139 return -ENODEV;
140 }
141}
142
143void __init pmac_get_boot_time(struct rtc_time *tm)
144{
145 pmac_get_rtc_time(tm);
146
147#ifdef disabled__CONFIG_NVRAM
148 s32 delta = 0;
149 int dst;
150
151 delta = ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x9)) << 16;
152 delta |= ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xa)) << 8;
153 delta |= pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xb);
154 if (delta & 0x00800000UL)
155 delta |= 0xFF000000UL;
156 dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
157 printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
158 dst ? "on" : "off");
159#endif
160}
161
162/*
163 * Query the OF and get the decr frequency.
164 * This was taken from the pmac time_init() when merging the prep/pmac
165 * time functions.
166 */
167void __init pmac_calibrate_decr(void)
168{
169 struct device_node *cpu;
170 unsigned int freq, *fp;
171 struct div_result divres;
172
173 /*
174 * The cpu node should have a timebase-frequency property
175 * to tell us the rate at which the decrementer counts.
176 */
177 cpu = find_type_devices("cpu");
178 if (cpu == 0)
179 panic("can't find cpu node in time_init");
180 fp = (unsigned int *) get_property(cpu, "timebase-frequency", NULL);
181 if (fp == 0)
182 panic("can't get cpu timebase frequency");
183 freq = *fp;
184 printk("time_init: decrementer frequency = %u.%.6u MHz\n",
185 freq/1000000, freq%1000000);
186 tb_ticks_per_jiffy = freq / HZ;
187 tb_ticks_per_sec = tb_ticks_per_jiffy * HZ;
188 tb_ticks_per_usec = freq / 1000000;
189 tb_to_us = mulhwu_scale_factor(freq, 1000000);
190 div128_by_32( 1024*1024, 0, tb_ticks_per_sec, &divres );
191 tb_to_xs = divres.result_low;
192 ppc_tb_freq = freq;
193
194 fp = (unsigned int *)get_property(cpu, "clock-frequency", NULL);
195 if (fp == 0)
196 panic("can't get cpu processor frequency");
197 ppc_proc_freq = *fp;
198
199 setup_default_decr();
200}
201
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-01 23:45:13 -0500