Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 00000000000..f24827581dd
--- /dev/null
+++ b/arch/ppc64/kernel/pmac_time.c
@@ -0,0 +1,201 @@
+/*
+ * Support for periodic interrupts (100 per second) and for getting
+ * the current time from the RTC on Power Macintoshes.
+ *
+ * We use the decrementer register for our periodic interrupts.
+ *
+ * Paul Mackerras	August 1996.
+ * Copyright (C) 1996 Paul Mackerras.
+ * Copyright (C) 2003-2005 Benjamin Herrenschmidt.
+ *
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <linux/interrupt.h>
+
+#include <asm/sections.h>
+#include <asm/prom.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/machdep.h>
+#include <asm/time.h>
+#include <asm/nvram.h>
+#include <asm/smu.h>
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+extern void setup_default_decr(void);
+
+extern unsigned long ppc_tb_freq;
+extern unsigned long ppc_proc_freq;
+
+/* Apparently the RTC stores seconds since 1 Jan 1904 */
+#define RTC_OFFSET	2082844800
+
+/*
+ * Calibrate the decrementer frequency with the VIA timer 1.
+ */
+#define VIA_TIMER_FREQ_6	4700000	/* time 1 frequency * 6 */
+
+extern struct timezone sys_tz;
+extern void to_tm(int tim, struct rtc_time * tm);
+
+void __pmac pmac_get_rtc_time(struct rtc_time *tm)
+{
+	switch(sys_ctrler) {
+#ifdef CONFIG_ADB_PMU
+	case SYS_CTRLER_PMU: {
+		/* TODO: Move that to a function in the PMU driver */
+		struct adb_request req;
+		unsigned int now;
+
+		if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
+			return;
+		pmu_wait_complete(&req);
+		if (req.reply_len != 4)
+			printk(KERN_ERR "pmac_get_rtc_time: PMU returned a %d"
+			       " bytes reply\n", req.reply_len);
+		now = (req.reply[0] << 24) + (req.reply[1] << 16)
+			+ (req.reply[2] << 8) + req.reply[3];
+		DBG("get: %u -> %u\n", (int)now, (int)(now - RTC_OFFSET));
+		now -= RTC_OFFSET;
+
+		to_tm(now, tm);
+		tm->tm_year -= 1900;
+		tm->tm_mon -= 1;
+	
+		DBG("-> tm_mday: %d, tm_mon: %d, tm_year: %d, %d:%02d:%02d\n",
+		    tm->tm_mday, tm->tm_mon, tm->tm_year,
+		    tm->tm_hour, tm->tm_min, tm->tm_sec);
+		break;
+	}
+#endif /* CONFIG_ADB_PMU */
+
+#ifdef CONFIG_PMAC_SMU
+	case SYS_CTRLER_SMU:
+		smu_get_rtc_time(tm);
+		break;
+#endif /* CONFIG_PMAC_SMU */
+	default:
+		;
+	}
+}
+
+int __pmac pmac_set_rtc_time(struct rtc_time *tm)
+{
+	switch(sys_ctrler) {
+#ifdef CONFIG_ADB_PMU
+	case SYS_CTRLER_PMU: {
+		/* TODO: Move that to a function in the PMU driver */
+		struct adb_request req;
+		unsigned int nowtime;
+
+		DBG("set: tm_mday: %d, tm_mon: %d, tm_year: %d,"
+		    " %d:%02d:%02d\n",
+		    tm->tm_mday, tm->tm_mon, tm->tm_year,
+		    tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+		nowtime = mktime(tm->tm_year + 1900, tm->tm_mon + 1,
+				 tm->tm_mday, tm->tm_hour, tm->tm_min,
+				 tm->tm_sec);
+
+		DBG("-> %u -> %u\n", (int)nowtime,
+		    (int)(nowtime + RTC_OFFSET));
+		nowtime += RTC_OFFSET;
+
+		if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
+				nowtime >> 24, nowtime >> 16,
+				nowtime >> 8, nowtime) < 0)
+			return -ENXIO;
+		pmu_wait_complete(&req);
+		if (req.reply_len != 0)
+			printk(KERN_ERR "pmac_set_rtc_time: PMU returned a %d"
+			       " bytes reply\n", req.reply_len);
+		return 0;
+	}
+#endif /* CONFIG_ADB_PMU */
+
+#ifdef CONFIG_PMAC_SMU
+	case SYS_CTRLER_SMU:
+		return smu_set_rtc_time(tm);
+#endif /* CONFIG_PMAC_SMU */
+	default:
+		return -ENODEV;
+	}
+}
+
+void __init pmac_get_boot_time(struct rtc_time *tm)
+{
+	pmac_get_rtc_time(tm);
+
+#ifdef disabled__CONFIG_NVRAM
+	s32 delta = 0;
+	int dst;
+	
+	delta = ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x9)) << 16;
+	delta |= ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xa)) << 8;
+	delta |= pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xb);
+	if (delta & 0x00800000UL)
+		delta |= 0xFF000000UL;
+	dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
+	printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
+		dst ? "on" : "off");
+#endif
+}
+
+/*
+ * Query the OF and get the decr frequency.
+ * This was taken from the pmac time_init() when merging the prep/pmac
+ * time functions.
+ */
+void __init pmac_calibrate_decr(void)
+{
+	struct device_node *cpu;
+	unsigned int freq, *fp;
+	struct div_result divres;
+
+	/*
+	 * The cpu node should have a timebase-frequency property
+	 * to tell us the rate at which the decrementer counts.
+	 */
+	cpu = find_type_devices("cpu");
+	if (cpu == 0)
+		panic("can't find cpu node in time_init");
+	fp = (unsigned int *) get_property(cpu, "timebase-frequency", NULL);
+	if (fp == 0)
+		panic("can't get cpu timebase frequency");
+	freq = *fp;
+	printk("time_init: decrementer frequency = %u.%.6u MHz\n",
+	       freq/1000000, freq%1000000);
+	tb_ticks_per_jiffy = freq / HZ;
+	tb_ticks_per_sec = tb_ticks_per_jiffy * HZ;
+	tb_ticks_per_usec = freq / 1000000;
+	tb_to_us = mulhwu_scale_factor(freq, 1000000);
+	div128_by_32( 1024*1024, 0, tb_ticks_per_sec, &divres );
+	tb_to_xs = divres.result_low;
+	ppc_tb_freq = freq;
+
+	fp = (unsigned int *)get_property(cpu, "clock-frequency", NULL);
+	if (fp == 0)
+		panic("can't get cpu processor frequency");
+	ppc_proc_freq = *fp;
+
+	setup_default_decr();
+}
+