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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Add IBM Cyclone support to Xen.
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 01966dd718a84c35c5baa1e16cd7db7c904f810e
# Parent b7e975425dd677520c630f92e2a2d6d2668cb1d5
Add IBM Cyclone support to Xen.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r b7e975425dd6 -r 01966dd718a8 xen/arch/x86/time.c
--- a/xen/arch/x86/time.c Wed Jul 27 15:32:44 2005
+++ b/xen/arch/x86/time.c Wed Jul 27 16:18:02 2005
@@ -199,13 +199,13 @@
outb(CALIBRATE_LATCH >> 8, PIT_CH2);
tsc_calibrate_status = 1;
- wmb();
+ wmb();
while ( (inb(0x61) & 0x20) == 0 )
continue;
tsc_calibrate_status = 2;
- wmb();
+ wmb();
while ( atomic_read(&tsc_calibrate_gang) != 0 )
mb();
@@ -232,7 +232,6 @@
atomic_dec(&tsc_calibrate_gang);
}
-
/************************************************************
* PLATFORM TIMER 1: PROGRAMMABLE INTERVAL TIMER (LEGACY PIT)
@@ -280,6 +279,8 @@
platform_timer_stamp = pit_counter64;
set_time_scale(&platform_timer_scale, CLOCK_TICK_RATE);
+ printk("Platform timer is PIT\n");
+
return 1;
}
@@ -318,12 +319,12 @@
if ( (hpet_address == 0) && opt_hpet_force )
{
- printk(KERN_WARNING "WARNING: Enabling HPET base manually!\n");
+ printk(KERN_WARNING "WARNING: Enabling HPET base manually!\n");
outl(0x800038a0, 0xcf8);
outl(0xff000001, 0xcfc);
outl(0x800038a0, 0xcf8);
hpet_address = inl(0xcfc) & 0xfffffffe;
- printk(KERN_WARNING "WARNING: Enabled HPET at %#lx.\n",
hpet_address);
+ printk(KERN_WARNING "WARNING: Enabled HPET at %#lx.\n", hpet_address);
}
if ( hpet_address == 0 )
@@ -382,6 +383,89 @@
init_ac_timer(&hpet_overflow_timer, hpet_overflow, NULL, 0);
hpet_overflow(NULL);
platform_timer_stamp = hpet_counter64;
+
+ printk("Platform timer is HPET\n");
+
+ return 1;
+}
+
+/************************************************************
+ * PLATFORM TIMER 3: IBM 'CYCLONE' TIMER
+ */
+
+int use_cyclone;
+
+/*
+ * Although the counter is read via a 64-bit register, I believe it is actually
+ * a 40-bit counter. Since this will wrap, I read only the low 32 bits and
+ * periodically fold into a 64-bit software counter, just as for PIT and HPET.
+ */
+#define CYCLONE_CBAR_ADDR 0xFEB00CD0
+#define CYCLONE_PMCC_OFFSET 0x51A0
+#define CYCLONE_MPMC_OFFSET 0x51D0
+#define CYCLONE_MPCS_OFFSET 0x51A8
+#define CYCLONE_TIMER_FREQ 100000000
+
+/* Protected by platform_timer_lock. */
+static u64 cyclone_counter64;
+static u32 cyclone_stamp;
+static struct ac_timer cyclone_overflow_timer;
+static volatile u32 *cyclone_timer; /* Cyclone MPMC0 register */
+
+static void cyclone_overflow(void *unused)
+{
+ u32 counter;
+
+ spin_lock(&platform_timer_lock);
+ counter = *cyclone_timer;
+ cyclone_counter64 += (u32)(counter - cyclone_stamp);
+ cyclone_stamp = counter;
+ spin_unlock(&platform_timer_lock);
+
+ set_ac_timer(&cyclone_overflow_timer, NOW() + MILLISECS(20000));
+}
+
+static u64 read_cyclone_count(void)
+{
+ return cyclone_counter64 + (u32)(*cyclone_timer - cyclone_stamp);
+}
+
+static volatile u32 *map_cyclone_reg(unsigned long regaddr)
+{
+ unsigned long pageaddr = regaddr & PAGE_MASK;
+ unsigned long offset = regaddr & ~PAGE_MASK;
+ set_fixmap_nocache(FIX_CYCLONE_TIMER, pageaddr);
+ return (volatile u32 *)(fix_to_virt(FIX_CYCLONE_TIMER) + offset);
+}
+
+static int init_cyclone(void)
+{
+ u32 base;
+
+ if ( !use_cyclone )
+ return 0;
+
+ /* Find base address. */
+ base = *(map_cyclone_reg(CYCLONE_CBAR_ADDR));
+ if ( base == 0 )
+ {
+ printk(KERN_ERR "Cyclone: Could not find valid CBAR value.\n");
+ return 0;
+ }
+
+ /* Enable timer and map the counter register. */
+ *(map_cyclone_reg(base + CYCLONE_PMCC_OFFSET)) = 1;
+ *(map_cyclone_reg(base + CYCLONE_MPCS_OFFSET)) = 1;
+ cyclone_timer = map_cyclone_reg(base + CYCLONE_MPMC_OFFSET);
+
+ read_platform_count = read_cyclone_count;
+
+ init_ac_timer(&cyclone_overflow_timer, cyclone_overflow, NULL, 0);
+ cyclone_overflow(NULL);
+ platform_timer_stamp = cyclone_counter64;
+ set_time_scale(&platform_timer_scale, CYCLONE_TIMER_FREQ);
+
+ printk("Platform timer is IBM Cyclone\n");
return 1;
}
@@ -427,7 +511,7 @@
static void init_platform_timer(void)
{
- if ( !init_hpet() )
+ if ( !init_cyclone() && !init_hpet() )
BUG_ON(!init_pit());
}
diff -r b7e975425dd6 -r 01966dd718a8 xen/include/asm-x86/fixmap.h
--- a/xen/include/asm-x86/fixmap.h Wed Jul 27 15:32:44 2005
+++ b/xen/include/asm-x86/fixmap.h Wed Jul 27 16:18:02 2005
@@ -31,6 +31,7 @@
FIX_ACPI_BEGIN,
FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
FIX_HPET_BASE,
+ FIX_CYCLONE_TIMER,
__end_of_fixed_addresses
};
diff -r b7e975425dd6 -r 01966dd718a8
xen/include/asm-x86/mach-summit/mach_mpparse.h
--- a/xen/include/asm-x86/mach-summit/mach_mpparse.h Wed Jul 27 15:32:44 2005
+++ b/xen/include/asm-x86/mach-summit/mach_mpparse.h Wed Jul 27 16:18:02 2005
@@ -30,7 +30,7 @@
(!strncmp(productid, "VIGIL SMP", 9)
|| !strncmp(productid, "EXA", 3)
|| !strncmp(productid, "RUTHLESS SMP", 12))){
- /*use_cyclone = 1;*/ /*enable cyclone-timer*/
+ use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
/*usb_early_handoff = 1;*/
return 1;
@@ -44,7 +44,7 @@
if (!strncmp(oem_id, "IBM", 3) &&
(!strncmp(oem_table_id, "SERVIGIL", 8)
|| !strncmp(oem_table_id, "EXA", 3))){
- /*use_cyclone = 1;*/ /*enable cyclone-timer*/
+ use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
/*usb_early_handoff = 1;*/
return 1;
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