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path: root/drivers/clocksource/acpi_pm.c
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Diffstat (limited to 'drivers/clocksource/acpi_pm.c')
-rw-r--r--drivers/clocksource/acpi_pm.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 7b46faf2231..5ca1d80de18 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -215,3 +215,22 @@ pm_good:
* but we still need to load before device_initcall
*/
fs_initcall(init_acpi_pm_clocksource);
+
+/*
+ * Allow an override of the IOPort. Stupid BIOSes do not tell us about
+ * the PMTimer, but we might know where it is.
+ */
+static int __init parse_pmtmr(char *arg)
+{
+ unsigned long base;
+
+ if (strict_strtoul(arg, 16, &base))
+ return -EINVAL;
+
+ printk(KERN_INFO "PMTMR IOPort override: 0x%04x -> 0x%04lx\n",
+ (unsigned int)pmtmr_ioport, base);
+ pmtmr_ioport = base;
+
+ return 1;
+}
+__setup("pmtmr=", parse_pmtmr);