Linux-2.6.12-rc2v2.6.12-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, 194 insertions, 0 deletions

diff --git a/arch/ppc/platforms/chrp_time.c b/arch/ppc/platforms/chrp_time.c
new file mode 100644
index 000000000000..e2be0c838d8a
--- /dev/null
+++ b/arch/ppc/platforms/chrp_time.c
@@ -0,0 +1,194 @@
+/*
+ *  arch/ppc/platforms/chrp_time.c
+ *
+ *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *
+ * Adapted for PowerPC (PReP) by Gary Thomas
+ * Modified by Cort Dougan (cort@cs.nmt.edu).
+ * Copied and modified from arch/i386/kernel/time.c
+ *
+ */
+#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/interrupt.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/kernel_stat.h>
+#include <linux/mc146818rtc.h>
+#include <linux/init.h>
+#include <linux/bcd.h>
+
+#include <asm/segment.h>
+#include <asm/io.h>
+#include <asm/nvram.h>
+#include <asm/prom.h>
+#include <asm/sections.h>
+#include <asm/time.h>
+
+extern spinlock_t rtc_lock;
+
+static int nvram_as1 = NVRAM_AS1;
+static int nvram_as0 = NVRAM_AS0;
+static int nvram_data = NVRAM_DATA;
+
+long __init chrp_time_init(void)
+{
+        struct device_node *rtcs;
+        int base;
+
+        rtcs = find_compatible_devices("rtc", "pnpPNP,b00");
+        if (rtcs == NULL)
+                rtcs = find_compatible_devices("rtc", "ds1385-rtc");
+        if (rtcs == NULL || rtcs->addrs == NULL)
+                return 0;
+        base = rtcs->addrs[0].address;
+        nvram_as1 = 0;
+        nvram_as0 = base;
+        nvram_data = base + 1;
+
+        return 0;
+}
+
+int __chrp chrp_cmos_clock_read(int addr)
+{
+        if (nvram_as1 != 0)
+                outb(addr>>8, nvram_as1);
+        outb(addr, nvram_as0);
+        return (inb(nvram_data));
+}
+
+void __chrp chrp_cmos_clock_write(unsigned long val, int addr)
+{
+        if (nvram_as1 != 0)
+                outb(addr>>8, nvram_as1);
+        outb(addr, nvram_as0);
+        outb(val, nvram_data);
+        return;
+}
+
+/*
+ * Set the hardware clock. -- Cort
+ */
+int __chrp chrp_set_rtc_time(unsigned long nowtime)
+{
+        unsigned char save_control, save_freq_select;
+        struct rtc_time tm;
+
+        spin_lock(&rtc_lock);
+        to_tm(nowtime, &tm);
+
+        save_control = chrp_cmos_clock_read(RTC_CONTROL); /* tell the clock it's being set */
+
+        chrp_cmos_clock_write((save_control|RTC_SET), RTC_CONTROL);
+
+        save_freq_select = chrp_cmos_clock_read(RTC_FREQ_SELECT); /* stop and reset prescaler */
+
+        chrp_cmos_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
+
+        tm.tm_year -= 1900;
+        if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+                BIN_TO_BCD(tm.tm_sec);
+                BIN_TO_BCD(tm.tm_min);
+                BIN_TO_BCD(tm.tm_hour);
+                BIN_TO_BCD(tm.tm_mon);
+                BIN_TO_BCD(tm.tm_mday);
+                BIN_TO_BCD(tm.tm_year);
+        }
+        chrp_cmos_clock_write(tm.tm_sec,RTC_SECONDS);
+        chrp_cmos_clock_write(tm.tm_min,RTC_MINUTES);
+        chrp_cmos_clock_write(tm.tm_hour,RTC_HOURS);
+        chrp_cmos_clock_write(tm.tm_mon,RTC_MONTH);
+        chrp_cmos_clock_write(tm.tm_mday,RTC_DAY_OF_MONTH);
+        chrp_cmos_clock_write(tm.tm_year,RTC_YEAR);
+
+        /* The following flags have to be released exactly in this order,
+         * otherwise the DS12887 (popular MC146818A clone with integrated
+         * battery and quartz) will not reset the oscillator and will not
+         * update precisely 500 ms later. You won't find this mentioned in
+         * the Dallas Semiconductor data sheets, but who believes data
+         * sheets anyway ...                           -- Markus Kuhn
+         */
+        chrp_cmos_clock_write(save_control, RTC_CONTROL);
+        chrp_cmos_clock_write(save_freq_select, RTC_FREQ_SELECT);
+
+        if ( (time_state == TIME_ERROR) || (time_state == TIME_BAD) )
+                time_state = TIME_OK;
+        spin_unlock(&rtc_lock);
+        return 0;
+}
+
+unsigned long __chrp chrp_get_rtc_time(void)
+{
+        unsigned int year, mon, day, hour, min, sec;
+        int uip, i;
+
+        /* The Linux interpretation of the CMOS clock register contents:
+         * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
+         * RTC registers show the second which has precisely just started.
+         * Let's hope other operating systems interpret the RTC the same way.
+         */
+
+        /* Since the UIP flag is set for about 2.2 ms and the clock
+         * is typically written with a precision of 1 jiffy, trying
+         * to obtain a precision better than a few milliseconds is
+         * an illusion. Only consistency is interesting, this also
+         * allows to use the routine for /dev/rtc without a potential
+         * 1 second kernel busy loop triggered by any reader of /dev/rtc.
+         */
+
+        for ( i = 0; i<1000000; i++) {
+                uip = chrp_cmos_clock_read(RTC_FREQ_SELECT);
+                sec = chrp_cmos_clock_read(RTC_SECONDS);
+                min = chrp_cmos_clock_read(RTC_MINUTES);
+                hour = chrp_cmos_clock_read(RTC_HOURS);
+                day = chrp_cmos_clock_read(RTC_DAY_OF_MONTH);
+                mon = chrp_cmos_clock_read(RTC_MONTH);
+                year = chrp_cmos_clock_read(RTC_YEAR);
+                uip |= chrp_cmos_clock_read(RTC_FREQ_SELECT);
+                if ((uip & RTC_UIP)==0) break;
+        }
+
+        if (!(chrp_cmos_clock_read(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
+          {
+            BCD_TO_BIN(sec);
+            BCD_TO_BIN(min);
+            BCD_TO_BIN(hour);
+            BCD_TO_BIN(day);
+            BCD_TO_BIN(mon);
+            BCD_TO_BIN(year);
+          }
+        if ((year += 1900) < 1970)
+                year += 100;
+        return mktime(year, mon, day, hour, min, sec);
+}
+
+
+void __init chrp_calibrate_decr(void)
+{
+        struct device_node *cpu;
+        unsigned int freq, *fp;
+
+        if (via_calibrate_decr())
+                return;
+
+        /*
+         * The cpu node should have a timebase-frequency property
+         * to tell us the rate at which the decrementer counts.
+         */
+        freq = 16666000;                /* hardcoded default */
+        cpu = find_type_devices("cpu");
+        if (cpu != 0) {
+                fp = (unsigned int *)
+                        get_property(cpu, "timebase-frequency", NULL);
+                if (fp != 0)
+                        freq = *fp;
+        }
+        printk("time_init: decrementer frequency = %u.%.6u MHz\n",
+               freq/1000000, freq%1000000);
+        tb_ticks_per_jiffy = freq / HZ;
+        tb_to_us = mulhwu_scale_factor(freq, 1000000);
+}