[PATCH] GTOD: add scx200 HRT clocksource

Add a GTOD clocksource driver based on the Geode SCx200's Hi-Res Timer.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 101 insertions, 0 deletions

diff --git a/drivers/clocksource/scx200_hrt.c b/drivers/clocksource/scx200_hrt.c
new file mode 100644
index 000000000000..d418b8297211
--- /dev/null
+++ b/drivers/clocksource/scx200_hrt.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2006 Jim Cromie
+ *
+ * This is a clocksource driver for the Geode SCx200's 1 or 27 MHz
+ * high-resolution timer.  The Geode SC-1100 (at least) has a buggy
+ * time stamp counter (TSC), which loses time unless 'idle=poll' is
+ * given as a boot-arg. In its absence, the Generic Timekeeping code
+ * will detect and de-rate the bad TSC, allowing this timer to take
+ * over timekeeping duties.
+ *
+ * Based on work by John Stultz, and Ted Phelps (in a 2.6.12-rc6 patch)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ */
+
+#include <linux/clocksource.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/scx200.h>
+
+#define NAME "scx200_hrt"
+
+static int mhz27;
+module_param(mhz27, int, 0);    /* load time only */
+MODULE_PARM_DESC(mhz27, "count at 27.0 MHz (default is 1.0 MHz)");
+
+static int ppm;
+module_param(ppm, int, 0);      /* load time only */
+MODULE_PARM_DESC(ppm, "+-adjust to actual XO freq (ppm)");
+
+/* HiRes Timer configuration register address */
+#define SCx200_TMCNFG_OFFSET (SCx200_TIMER_OFFSET + 5)
+
+/* and config settings */
+#define HR_TMEN (1 << 0)        /* timer interrupt enable */
+#define HR_TMCLKSEL (1 << 1)    /* 1|0 counts at 27|1 MHz */
+#define HR_TM27MPD (1 << 2)     /* 1 turns off input clock (power-down) */
+
+/* The base timer frequency, * 27 if selected */
+#define HRT_FREQ   1000000
+
+static cycle_t read_hrt(void)
+{
+        /* Read the timer value */
+        return (cycle_t) inl(scx200_cb_base + SCx200_TIMER_OFFSET);
+}
+
+#define HRT_SHIFT_1     22
+#define HRT_SHIFT_27    26
+
+static struct clocksource cs_hrt = {
+        .name           = "scx200_hrt",
+        .rating         = 250,
+        .read           = read_hrt,
+        .mask           = CLOCKSOURCE_MASK(32),
+        .is_continuous  = 1,
+        /* mult, shift are set based on mhz27 flag */
+};
+
+static int __init init_hrt_clocksource(void)
+{
+        /* Make sure scx200 has initializedd the configuration block */
+        if (!scx200_cb_present())
+                return -ENODEV;
+
+        /* Reserve the timer's ISA io-region for ourselves */
+        if (!request_region(scx200_cb_base + SCx200_TIMER_OFFSET,
+                            SCx200_TIMER_SIZE,
+                            "NatSemi SCx200 High-Resolution Timer")) {
+                printk(KERN_WARNING NAME ": unable to lock timer region\n");
+                return -ENODEV;
+        }
+
+        /* write timer config */
+        outb(HR_TMEN | (mhz27) ? HR_TMCLKSEL : 0,
+             scx200_cb_base + SCx200_TMCNFG_OFFSET);
+
+        if (mhz27) {
+                cs_hrt.shift = HRT_SHIFT_27;
+                cs_hrt.mult = clocksource_hz2mult((HRT_FREQ + ppm) * 27,
+                                                  cs_hrt.shift);
+        } else {
+                cs_hrt.shift = HRT_SHIFT_1;
+                cs_hrt.mult = clocksource_hz2mult(HRT_FREQ + ppm,
+                                                  cs_hrt.shift);
+        }
+        printk(KERN_INFO "enabling scx200 high-res timer (%s MHz +%d ppm)\n",
+                mhz27 ? "27":"1", ppm);
+
+        return clocksource_register(&cs_hrt);
+}
+
+module_init(init_hrt_clocksource);
+
+MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
+MODULE_DESCRIPTION("clocksource on SCx200 HiRes Timer");
+MODULE_LICENSE("GPL");