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12#undef DEBUG
13
14#include <linux/errno.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/param.h>
18#include <linux/string.h>
19#include <linux/mm.h>
20#include <linux/init.h>
21#include <linux/time.h>
22#include <linux/adb.h>
23#include <linux/pmu.h>
24#include <linux/interrupt.h>
25#include <linux/mc146818rtc.h>
26#include <linux/bcd.h>
27
28#include <asm/sections.h>
29#include <asm/prom.h>
30#include <asm/io.h>
31#include <asm/pgtable.h>
32#include <asm/machdep.h>
33#include <asm/time.h>
34
35#include "maple.h"
36
37#ifdef DEBUG
38#define DBG(x...) printk(x)
39#else
40#define DBG(x...)
41#endif
42
43static int maple_rtc_addr;
44
45static int maple_clock_read(int addr)
46{
47 outb_p(addr, maple_rtc_addr);
48 return inb_p(maple_rtc_addr+1);
49}
50
51static void maple_clock_write(unsigned long val, int addr)
52{
53 outb_p(addr, maple_rtc_addr);
54 outb_p(val, maple_rtc_addr+1);
55}
56
57void maple_get_rtc_time(struct rtc_time *tm)
58{
59 do {
60 tm->tm_sec = maple_clock_read(RTC_SECONDS);
61 tm->tm_min = maple_clock_read(RTC_MINUTES);
62 tm->tm_hour = maple_clock_read(RTC_HOURS);
63 tm->tm_mday = maple_clock_read(RTC_DAY_OF_MONTH);
64 tm->tm_mon = maple_clock_read(RTC_MONTH);
65 tm->tm_year = maple_clock_read(RTC_YEAR);
66 } while (tm->tm_sec != maple_clock_read(RTC_SECONDS));
67
68 if (!(maple_clock_read(RTC_CONTROL) & RTC_DM_BINARY)
69 || RTC_ALWAYS_BCD) {
70 tm->tm_sec = bcd2bin(tm->tm_sec);
71 tm->tm_min = bcd2bin(tm->tm_min);
72 tm->tm_hour = bcd2bin(tm->tm_hour);
73 tm->tm_mday = bcd2bin(tm->tm_mday);
74 tm->tm_mon = bcd2bin(tm->tm_mon);
75 tm->tm_year = bcd2bin(tm->tm_year);
76 }
77 if ((tm->tm_year + 1900) < 1970)
78 tm->tm_year += 100;
79
80 tm->tm_wday = -1;
81}
82
83int maple_set_rtc_time(struct rtc_time *tm)
84{
85 unsigned char save_control, save_freq_select;
86 int sec, min, hour, mon, mday, year;
87
88 spin_lock(&rtc_lock);
89
90 save_control = maple_clock_read(RTC_CONTROL);
91
92 maple_clock_write((save_control|RTC_SET), RTC_CONTROL);
93
94 save_freq_select = maple_clock_read(RTC_FREQ_SELECT);
95
96 maple_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
97
98 sec = tm->tm_sec;
99 min = tm->tm_min;
100 hour = tm->tm_hour;
101 mon = tm->tm_mon;
102 mday = tm->tm_mday;
103 year = tm->tm_year;
104
105 if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
106 sec = bin2bcd(sec);
107 min = bin2bcd(min);
108 hour = bin2bcd(hour);
109 mon = bin2bcd(mon);
110 mday = bin2bcd(mday);
111 year = bin2bcd(year);
112 }
113 maple_clock_write(sec, RTC_SECONDS);
114 maple_clock_write(min, RTC_MINUTES);
115 maple_clock_write(hour, RTC_HOURS);
116 maple_clock_write(mon, RTC_MONTH);
117 maple_clock_write(mday, RTC_DAY_OF_MONTH);
118 maple_clock_write(year, RTC_YEAR);
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126
127 maple_clock_write(save_control, RTC_CONTROL);
128 maple_clock_write(save_freq_select, RTC_FREQ_SELECT);
129
130 spin_unlock(&rtc_lock);
131
132 return 0;
133}
134
135static struct resource rtc_iores = {
136 .name = "rtc",
137 .flags = IORESOURCE_IO | IORESOURCE_BUSY,
138};
139
140time64_t __init maple_get_boot_time(void)
141{
142 struct rtc_time tm;
143 struct device_node *rtcs;
144
145 rtcs = of_find_compatible_node(NULL, "rtc", "pnpPNP,b00");
146 if (rtcs) {
147 struct resource r;
148 if (of_address_to_resource(rtcs, 0, &r)) {
149 printk(KERN_EMERG "Maple: Unable to translate RTC"
150 " address\n");
151 goto bail;
152 }
153 if (!(r.flags & IORESOURCE_IO)) {
154 printk(KERN_EMERG "Maple: RTC address isn't PIO!\n");
155 goto bail;
156 }
157 maple_rtc_addr = r.start;
158 printk(KERN_INFO "Maple: Found RTC at IO 0x%x\n",
159 maple_rtc_addr);
160 }
161 bail:
162 if (maple_rtc_addr == 0) {
163 maple_rtc_addr = RTC_PORT(0);
164 printk(KERN_INFO "Maple: No device node for RTC, assuming "
165 "legacy address (0x%x)\n", maple_rtc_addr);
166 }
167
168 rtc_iores.start = maple_rtc_addr;
169 rtc_iores.end = maple_rtc_addr + 7;
170 request_resource(&ioport_resource, &rtc_iores);
171
172 maple_get_rtc_time(&tm);
173 return rtc_tm_to_time64(&tm);
174}
175
176
