diff options
Diffstat (limited to 'target/linux/x86-2.6/patches/100-scx200_hr_timer.patch')
| -rw-r--r-- | target/linux/x86-2.6/patches/100-scx200_hr_timer.patch | 320 |
1 files changed, 0 insertions, 320 deletions
diff --git a/target/linux/x86-2.6/patches/100-scx200_hr_timer.patch b/target/linux/x86-2.6/patches/100-scx200_hr_timer.patch deleted file mode 100644 index 38fc16a74c..0000000000 --- a/target/linux/x86-2.6/patches/100-scx200_hr_timer.patch +++ /dev/null @@ -1,320 +0,0 @@ -SCx200 High Resolution Timer Patch for Linux 2.6 -http://www.gnusto.com/scx200-hr-timer.html - -diff -Naurp linux-2.6.12-rc6.orig/arch/i386/Kconfig linux-2.6.12-rc6/arch/i386/Kconfig ---- linux-2.6.12-rc6.orig/arch/i386/Kconfig 2005-06-07 14:56:02.000000000 +0100 -+++ linux-2.6.12-rc6/arch/i386/Kconfig 2005-06-07 16:43:19.000000000 +0100 -@@ -458,6 +458,17 @@ config HPET_EMULATE_RTC - bool "Provide RTC interrupt" - depends on HPET_TIMER && RTC=y - -+config SCx200HR_TIMER -+ bool "NatSemi SCx200 27MHz High-Resolution Timer Support" -+ help -+ Some of the AMD (formerly National Semiconductor) Geode -+ processors, notably the SC1100, suffer from a buggy time -+ stamp counter which causes them to lose time when the -+ processor is sleeping. Enable this option to use the -+ on-board 27Mz high-resolution timer to keep time instead. -+ depends on (SCx200) -+ default n -+ - config SMP - bool "Symmetric multi-processing support" - ---help--- -diff -Naurp linux-2.6.12-rc6.orig/arch/i386/kernel/scx200.c linux-2.6.12-rc6/arch/i386/kernel/scx200.c ---- linux-2.6.12-rc6.orig/arch/i386/kernel/scx200.c 2005-06-07 14:56:02.000000000 +0100 -+++ linux-2.6.12-rc6/arch/i386/kernel/scx200.c 2005-06-07 16:43:19.000000000 +0100 -@@ -27,6 +27,10 @@ long scx200_gpio_shadow[2]; - - unsigned scx200_cb_base = 0; - -+#ifdef CONFIG_SCx200HR_TIMER -+extern void __devinit scx200hr_timer_enable(void); -+#endif -+ - static struct pci_device_id scx200_tbl[] = { - { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, - { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, -@@ -83,6 +87,9 @@ static int __devinit scx200_probe(struct - printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base); - } - -+#ifdef CONFIG_SCx200HR_TIMER -+ scx200hr_timer_enable(); -+#endif - return 0; - } - -diff -Naurp linux-2.6.12-rc6.orig/arch/i386/kernel/timers/Makefile linux-2.6.12-rc6/arch/i386/kernel/timers/Makefile ---- linux-2.6.12-rc6.orig/arch/i386/kernel/timers/Makefile 2004-03-11 18:21:13.000000000 +0000 -+++ linux-2.6.12-rc6/arch/i386/kernel/timers/Makefile 2005-06-07 16:43:19.000000000 +0100 -@@ -5,5 +5,6 @@ - obj-y := timer.o timer_none.o timer_tsc.o timer_pit.o common.o - - obj-$(CONFIG_X86_CYCLONE_TIMER) += timer_cyclone.o -+obj-$(CONFIG_SCx200HR_TIMER) += timer_scx200hr.o - obj-$(CONFIG_HPET_TIMER) += timer_hpet.o - obj-$(CONFIG_X86_PM_TIMER) += timer_pm.o -diff -Naurp linux-2.6.12-rc6.orig/arch/i386/kernel/timers/timer.c linux-2.6.12-rc6/arch/i386/kernel/timers/timer.c ---- linux-2.6.12-rc6.orig/arch/i386/kernel/timers/timer.c 2004-12-26 14:07:37.000000000 +0000 -+++ linux-2.6.12-rc6/arch/i386/kernel/timers/timer.c 2005-06-07 16:43:19.000000000 +0100 -@@ -13,6 +13,9 @@ - #endif - /* list of timers, ordered by preference, NULL terminated */ - static struct init_timer_opts* __initdata timers[] = { -+#ifdef CONFIG_SCx200HR_TIMER -+ &timer_scx200hr_init, -+#endif - #ifdef CONFIG_X86_CYCLONE_TIMER - &timer_cyclone_init, - #endif -diff -Naurp linux-2.6.12-rc6.orig/arch/i386/kernel/timers/timer_scx200hr.c linux-2.6.12-rc6/arch/i386/kernel/timers/timer_scx200hr.c ---- linux-2.6.12-rc6.orig/arch/i386/kernel/timers/timer_scx200hr.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.12-rc6/arch/i386/kernel/timers/timer_scx200hr.c 2005-06-07 16:43:19.000000000 +0100 -@@ -0,0 +1,220 @@ -+/* -+ * Copyright (C) 2005 Ted Phelps -+ * -+ * This is a clock driver for the Geode SCx200's 27MHz high-resolution -+ * timer as the system clock replacing its buggy time stamp counter. -+ * -+ * Based on parts of timer_hpet.c, timer_tsc.c and timer_pit.c. -+ * -+ * 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 <asm/timer.h> -+#include <linux/init.h> -+#include <linux/pci.h> -+#include <linux/seq_file.h> -+#include <linux/scx200.h> -+ -+#define NAME "scx200hr" -+ -+/* Read the clock */ -+#define SCx200HR_CLOCK() inl(scx200_cb_base + SCx200_TIMER_OFFSET) -+ -+/* High-resolution timer configuration address */ -+#define SCx200_TMCNFG_OFFSET (SCx200_TIMER_OFFSET + 5) -+ -+/* Set this bit to disable the 27 MHz input clock */ -+#define HR_TM27MPD (1 << 2) -+ -+/* Set this bit to update the count-up timer once per cycle of the -+ * 27MHz timer, clear it to update the timer once every 27 cycles -+ * (effectively producing a 1MHz counter) */ -+#define HR_TMCLKSEL (1 << 1) -+ -+/* Set this bit to enable the high-resolution timer interrupt */ -+#define HR_TMEN (1 << 0) -+ -+/* The frequency of the timer. Change this to 27000000 and set -+ * HR_TMCLKSEL in scx200hr_enable to run at the faster clock rate. At -+ * this point in time there is no point in doing so since times are -+ * recorded in usec except for the monotonic clock, which is only used -+ * by the hangcheck-timer. */ -+#define HR_FREQ 1000000 -+ -+/* The number of cycles of the high-resolution timer we expect to see -+ * in a single tick. Note that the result is <<8 for greater precision*/ -+#define HR_CYCLES_PER_TICK \ -+ (SH_DIV(HR_FREQ / 1000000 * TICK_NSEC, 1000, 8)) -+ -+/* The number of cycles of the high-resolution timer we expect to see -+ * in one microsecond, <<8 */ -+#define HR_CYCLES_PER_US ((HR_FREQ / 1000000) << 8) -+ -+ -+/* The value of the timer at the last interrupt */ -+static u32 clock_at_last_interrupt; -+ -+/* The number of high-resolution clock cycles beyond what we would -+ have expected that the last tick occurred, <<8 for greater precision */ -+static long clock_delay; -+ -+/* The total number of timer nanoseconds between the time the timer -+ * went live and the most recent tick. */ -+static unsigned long long total_ns; -+ -+/* A lock to guard access to the monotonic clock-related variables -+ * (total_ns and clocal_at_last_interrupt). Note that these are also -+ * protected by the xtime lock. */ -+static seqlock_t hr_lock = SEQLOCK_UNLOCKED; -+ -+/* Nonzero if the timer has been selected */ -+static int enable_scx200hr; -+ -+static int __init scx200hr_init(char *override) -+{ -+ /* Watch for a command-line clock= override */ -+ if (override[0] && strncmp(override, NAME, sizeof(NAME) - 1) != 0) { -+ return -ENODEV; -+ } -+ -+ /* Note that we should try to enable this timer once the -+ * configuration block address is known */ -+ printk(KERN_WARNING NAME ": timer not yet accessible; will probe later.\n"); -+ enable_scx200hr = 1; -+ return -EAGAIN; -+} -+ -+/* Called by the timer interrupt. The xtime_lock will be held. */ -+static void mark_offset_scx200hr(void) -+{ -+ u32 now, delta; -+ -+ /* Avoid races between the interrupt handler and monotonic_clock */ -+ write_seqlock(&hr_lock); -+ -+ /* Determine how many cycles have elapsed since the last interrupt */ -+ now = SCx200HR_CLOCK(); -+ delta = (now - clock_at_last_interrupt) << 8; -+ clock_at_last_interrupt = now; -+ -+ /* Update the total us count and remainder */ -+ total_ns += (delta * 1000) / HR_CYCLES_PER_US; -+ -+ /* The monotonic clock is safe now */ -+ write_sequnlock(&hr_lock); -+ -+ /* Adjust for interrupt handling delay */ -+ delta += clock_delay; -+ -+ /* The high-resolution timer is driven by a different crystal -+ * to the main CPU, so there's no guarantee that the 1KHz -+ * interrupt rate will coincide with the timer. This keeps -+ * the jiffies count in line with the high-resolution timer, -+ * which makes it possible for NTP to do its magic */ -+ if (delta < HR_CYCLES_PER_TICK) { -+#if 1 -+ /* Didn't go over 1000us: decrement jiffies to balance -+ * out increment in do_timer. This will cause some -+ * jitter if the frequency offset is large, as that -+ * adjustment will be applied about 1ms late. */ -+ jiffies_64--; -+ clock_delay = delta; -+#else /* !1 */ -+ clock_delay = 0; -+#endif /* 1 */ -+ } else if (delta < (HR_CYCLES_PER_TICK << 1) + (HR_CYCLES_PER_TICK >> 1)) { -+ clock_delay = delta - HR_CYCLES_PER_TICK; -+ } else { -+ jiffies_64 += delta / HR_CYCLES_PER_TICK - 2; -+ clock_delay = HR_CYCLES_PER_TICK + delta % HR_CYCLES_PER_TICK; -+ } -+} -+ -+/* Called by gettimeofday(). Returns the number of microseconds since -+ * the last interrupt. This is called with the xtime_lock held.*/ -+static unsigned long get_offset_scx200hr(void) -+{ -+ u32 delta; -+ -+ /* Get the time now and determine how many cycles have -+ * transpired since the interrupt, adjusting for timer -+ * interrupt jitter. */ -+ delta = ((SCx200HR_CLOCK() - clock_at_last_interrupt) << 8) + clock_delay; -+ -+ /* Convert from cycles<<8 to microseconds */ -+ return delta / HR_CYCLES_PER_US; -+} -+ -+/* Returns the number of nanoseconds since the init of the timer. */ -+static unsigned long long monotonic_clock_scx200hr(void) -+{ -+ u32 delta, seq; -+ unsigned long long ns; -+ -+ /* This function is *not* called with xtime_lock held, so we -+ * need to get the hr_lock to ensure we're not competing with -+ * mark_offset_scx200hr. */ -+ do { -+ seq = read_seqbegin(&hr_lock); -+ ns = total_ns; -+ delta = SCx200HR_CLOCK() - clock_at_last_interrupt; -+ } while (read_seqretry(&hr_lock, seq)); -+ -+ /* Convert cycles to microseconds and add. */ -+ return ns + delta * 1000 / HR_CYCLES_PER_US; -+} -+ -+/* scx200hr timer_opts struct */ -+struct timer_opts timer_scx200hr = { -+ .name = NAME, -+ .mark_offset = mark_offset_scx200hr, -+ .get_offset = get_offset_scx200hr, -+ .monotonic_clock = monotonic_clock_scx200hr, -+ .delay = NULL -+}; -+ -+/* And the init_timer struct */ -+struct init_timer_opts __devinitdata timer_scx200hr_init = { -+ .init = scx200hr_init, -+ .opts = &timer_scx200hr -+}; -+ -+ -+/* Switch from the original timer to the high-resolution timer */ -+void __devinit scx200hr_timer_enable(void) -+{ -+ /* Make sure the timer was requested and that the -+ * configuration block is present */ -+ if (!enable_scx200hr || !scx200_cb_present()) { -+ return; -+ } -+ -+ /* Reserve the timer 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; -+ } -+ -+ /* Configure the timer */ -+ outb(0, scx200_cb_base + SCx200_TMCNFG_OFFSET); -+ -+ /* Record the current value of the timer. */ -+ clock_at_last_interrupt = SCx200HR_CLOCK(); -+ -+ /* Get the current value of the monotonic clock */ -+ total_ns = cur_timer->monotonic_clock(); -+ -+ /* Switch from the original timer functions to ours, but keep -+ * the current delay function since loops_per_jiffy will have -+ * been computed using that */ -+ timer_scx200hr.delay = cur_timer->delay; -+ cur_timer = &timer_scx200hr; -+ -+ printk(KERN_INFO "switching to scx200 high-resolution timer (%lu cpt)\n", -+ HR_CYCLES_PER_TICK); -+} -diff -Naurp linux-2.6.12-rc6.orig/include/asm-i386/timer.h linux-2.6.12-rc6/include/asm-i386/timer.h ---- linux-2.6.12-rc6.orig/include/asm-i386/timer.h 2005-06-07 14:56:11.000000000 +0100 -+++ linux-2.6.12-rc6/include/asm-i386/timer.h 2005-06-07 16:43:19.000000000 +0100 -@@ -50,6 +50,9 @@ extern struct init_timer_opts timer_tsc_ - #ifdef CONFIG_X86_CYCLONE_TIMER - extern struct init_timer_opts timer_cyclone_init; - #endif -+#ifdef CONFIG_SCx200HR_TIMER -+extern struct init_timer_opts timer_scx200hr_init; -+#endif - - extern unsigned long calibrate_tsc(void); - extern void init_cpu_khz(void); -diff -Naurp linux-2.6.12-rc6.orig/include/linux/scx200.h linux-2.6.12-rc6/include/linux/scx200.h ---- linux-2.6.12-rc6.orig/include/linux/scx200.h 2005-06-07 14:56:11.000000000 +0100 -+++ linux-2.6.12-rc6/include/linux/scx200.h 2005-06-07 16:43:19.000000000 +0100 -@@ -32,7 +32,7 @@ extern unsigned scx200_cb_base; - - /* High Resolution Timer */ - #define SCx200_TIMER_OFFSET 0x08 --#define SCx200_TIMER_SIZE 0x05 -+#define SCx200_TIMER_SIZE 0x06 - - /* Clock Generators */ - #define SCx200_CLOCKGEN_OFFSET 0x10 |