Author: mav
Date: Sat Sep 18 16:57:05 2010
New Revision: 212825
URL: http://svn.freebsd.org/changeset/base/212825
Log:
Add basic cpu_sleep() support for Marvell SoCs. This drops my SheevaPlug's
heatsink termperature in open air from 49C to 43C when idle.
Modified:
head/sys/arm/arm/cpufunc.c
head/sys/arm/arm/cpufunc_asm_sheeva.S
head/sys/arm/include/cpufunc.h
Modified: head/sys/arm/arm/cpufunc.c
==============================================================================
--- head/sys/arm/arm/cpufunc.c Sat Sep 18 15:03:31 2010 (r212824)
+++ head/sys/arm/arm/cpufunc.c Sat Sep 18 16:57:05 2010 (r212825)
@@ -397,7 +397,7 @@ struct cpu_functions sheeva_cpufuncs = {
cpufunc_nullop, /* flush_brnchtgt_C */
(void *)cpufunc_nullop, /* flush_brnchtgt_E */
- (void *)cpufunc_nullop, /* sleep */
+ sheeva_cpu_sleep, /* sleep */
/* Soft functions */
@@ -1076,6 +1076,9 @@ set_cpufuncs()
FC_DCACHE_STREAM_EN | FC_WR_ALLOC_EN |
FC_BRANCH_TARG_BUF_DIS | FC_L2CACHE_EN);
}
+
+ /* Use powersave on this CPU. */
+ cpu_do_powersave = 1;
} else
cpufuncs = armv5_ec_cpufuncs;
Modified: head/sys/arm/arm/cpufunc_asm_sheeva.S
==============================================================================
--- head/sys/arm/arm/cpufunc_asm_sheeva.S Sat Sep 18 15:03:31 2010
(r212824)
+++ head/sys/arm/arm/cpufunc_asm_sheeva.S Sat Sep 18 16:57:05 2010
(r212825)
@@ -392,3 +392,10 @@ ENTRY(sheeva_control_ext)
mcrne p15, 1, r2, c15, c1, 0 /* Write new control register */
mov r0, r3 /* Return old value */
RET
+
+ENTRY(sheeva_cpu_sleep)
+ mov r0, #0
+ mcr p15, 0, r0, c7, c10, 4 /* Drain write buffer */
+ mcr p15, 0, r0, c7, c0, 4 /* Wait for interrupt */
+ mov pc, lr
+
Modified: head/sys/arm/include/cpufunc.h
==============================================================================
--- head/sys/arm/include/cpufunc.h Sat Sep 18 15:03:31 2010
(r212824)
+++ head/sys/arm/include/cpufunc.h Sat Sep 18 16:57:05 2010
(r212825)
@@ -400,6 +400,7 @@ extern unsigned arm10_dcache_index_max;
extern unsigned arm10_dcache_index_inc;
u_int sheeva_control_ext (u_int, u_int);
+void sheeva_cpu_sleep (int);
void sheeva_setttb (u_int);
void sheeva_dcache_wbinv_range (vm_offset_t, vm_size_t);
void sheeva_dcache_inv_range (vm_offset_t, vm_size_t);
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