From: Olof Johansson <olof@lixom•net>
To: Paul Mackerras <paulus@samba•org>
Cc: linuxppc-dev@ozlabs•org
Subject: [PATCH] [4/9] pasemi: Idle loops
Date: Thu, 01 Feb 2007 22:54:52 -0600 [thread overview]
Message-ID: <20070202045508.379230000@lixom.net> (raw)
In-Reply-To: 20070202045448.145851000@lixom.net
Powersave support on PA6T. Right now it only uses 'doze' mode, and
will default to no savings (spin).
Signed-off-by: Olof Johansson <olof@lixom•net>
Index: merge/arch/powerpc/platforms/pasemi/idle.c
===================================================================
--- /dev/null
+++ merge/arch/powerpc/platforms/pasemi/idle.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Maintained by: Olof Johansson <olof@lixom•net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/machdep.h>
+#include <asm/reg.h>
+
+#include "pasemi.h"
+
+struct sleep_mode {
+ char *name;
+ void (*entry)(void);
+};
+
+static struct sleep_mode modes[] = {
+ { .name = "spin", .entry = &idle_spin },
+ { .name = "doze", .entry = &idle_doze },
+};
+
+static int current_mode = 0;
+
+static void pasemi_idle(void)
+{
+ while (1) {
+ /* XXXOJN oprofile off? */
+ while (!need_resched())
+ modes[current_mode].entry();
+
+ /* XXXOJN oprofile on? */
+ preempt_enable_no_resched();
+ schedule();
+ preempt_disable();
+ }
+}
+
+static int pasemi_system_reset_exception(struct pt_regs *regs)
+{
+ /* If we were woken up from power savings, we need to return
+ * to the calling function, since nip is not saved across
+ * all modes.
+ */
+
+ if (regs->msr & SRR1_WAKEMASK)
+ regs->nip = regs->link;
+
+ switch (regs->msr & SRR1_WAKEMASK) {
+ case SRR1_WAKEEE:
+ do_IRQ(regs);
+ break;
+ case SRR1_WAKEDEC:
+ timer_interrupt(regs);
+ break;
+ default:
+ /* do system reset */
+ return 0;
+ }
+ /* everything handled */
+ regs->msr |= MSR_RI;
+ return 1;
+}
+
+void __init pasemi_idle_init(void)
+{
+ ppc_md.idle_loop = pasemi_idle;
+ ppc_md.system_reset_exception = pasemi_system_reset_exception;
+ printk(KERN_INFO "Using PA6T idle loop (%s)\n", modes[current_mode].name);
+}
+
+static int __init idle_param(char *p)
+{
+ int i;
+ for (i = 0; i < sizeof(modes)/sizeof(struct sleep_mode); i++) {
+ if (!strcmp(modes[i].name, p)) {
+ current_mode = i;
+ break;
+ }
+ }
+ return 0;
+}
+
+early_param("idle", idle_param);
Index: merge/arch/powerpc/platforms/pasemi/Makefile
===================================================================
--- merge.orig/arch/powerpc/platforms/pasemi/Makefile
+++ merge/arch/powerpc/platforms/pasemi/Makefile
@@ -1 +1,2 @@
-obj-y += setup.o pci.o time.o
+obj-y += setup.o pci.o time.o idle.o powersave.o
+
Index: merge/arch/powerpc/platforms/pasemi/setup.c
===================================================================
--- merge.orig/arch/powerpc/platforms/pasemi/setup.c
+++ merge/arch/powerpc/platforms/pasemi/setup.c
@@ -92,7 +92,7 @@ void __init pas_setup_arch(void)
#endif
}
- printk(KERN_DEBUG "Using default idle loop\n");
+ pasemi_idle_init();
}
/* No legacy IO on our parts */
Index: merge/arch/powerpc/platforms/pasemi/pasemi.h
===================================================================
--- merge.orig/arch/powerpc/platforms/pasemi/pasemi.h
+++ merge/arch/powerpc/platforms/pasemi/pasemi.h
@@ -4,4 +4,11 @@
extern unsigned long pas_get_boot_time(void);
extern void pas_pci_init(void);
+extern void __init pasemi_idle_init(void);
+
+/* Power savings modes, implemented in asm */
+extern void idle_spin(void);
+extern void idle_doze(void);
+
+
#endif /* _PASEMI_PASEMI_H */
Index: merge/arch/powerpc/kernel/Makefile
===================================================================
--- merge.orig/arch/powerpc/kernel/Makefile
+++ merge/arch/powerpc/kernel/Makefile
@@ -17,6 +17,7 @@ obj-y += vdso32/
obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
signal_64.o ptrace32.o \
paca.o cpu_setup_ppc970.o \
+ cpu_setup_pa6t.o \
firmware.o sysfs.o nvram_64.o
obj-$(CONFIG_PPC64) += vdso64/
obj-$(CONFIG_ALTIVEC) += vecemu.o vector.o
Index: merge/arch/powerpc/kernel/cpu_setup_pa6t.S
===================================================================
--- /dev/null
+++ merge/arch/powerpc/kernel/cpu_setup_pa6t.S
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Maintained by: Olof Johansson <olof@lixom•net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/cputable.h>
+#include <asm/ppc_asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/cache.h>
+
+/* Right now, restore and setup are the same thing */
+_GLOBAL(__restore_cpu_pa6t)
+_GLOBAL(__setup_cpu_pa6t)
+ /* Do nothing if not running in HV mode */
+ mfmsr r0
+ rldicl. r0,r0,4,63
+ beqlr
+
+ mfspr r0,SPRN_HID5
+ ori r0,r0,0x30
+ mtspr SPRN_HID5,r0
+
+ mfspr r0,SPRN_LPCR
+ ori r0,r0,0x7000
+ mtspr SPRN_LPCR,r0
+
+ blr
Index: merge/arch/powerpc/kernel/cputable.c
===================================================================
--- merge.orig/arch/powerpc/kernel/cputable.c
+++ merge/arch/powerpc/kernel/cputable.c
@@ -43,6 +43,8 @@ extern void __setup_cpu_745x(unsigned lo
#ifdef CONFIG_PPC64
extern void __setup_cpu_ppc970(unsigned long offset, struct cpu_spec* spec);
extern void __setup_cpu_ppc970MP(unsigned long offset, struct cpu_spec* spec);
+extern void __setup_cpu_pa6t(unsigned long offset, struct cpu_spec* spec);
+extern void __restore_cpu_pa6t(unsigned long offset, struct cpu_spec* spec);
extern void __restore_cpu_ppc970(void);
#endif /* CONFIG_PPC64 */
@@ -369,6 +371,8 @@ static struct cpu_spec cpu_specs[] = {
.dcache_bsize = 64,
.num_pmcs = 6,
.pmc_type = PPC_PMC_PA6T,
+ .cpu_setup = __setup_cpu_pa6t,
+ .cpu_restore = __restore_cpu_pa6t,
.platform = "pa6t",
},
{ /* default match */
Index: merge/arch/powerpc/platforms/pasemi/powersave.S
===================================================================
--- /dev/null
+++ merge/arch/powerpc/platforms/pasemi/powersave.S
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Maintained by: Olof Johansson <olof@lixom•net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/ppc_asm.h>
+#include <asm/cputable.h>
+#include <asm/cache.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+
+/* Power savings opcodes since not all binutils have them at this time */
+#define DOZE .long 0x4c000324
+#define NAP .long 0x4c000364
+#define SLEEP .long 0x4c0003a4
+#define RVW .long 0x4c0003e4
+
+/* Common sequence to do before going to any of the
+ * powersavings modes.
+ */
+
+#define PRE_SLEEP_SEQUENCE \
+ std r3,8(r1); \
+ ptesync ; \
+ ld r3,8(r1); \
+1: cmpd r3,r3; \
+ bne 1b
+
+_doze:
+ PRE_SLEEP_SEQUENCE
+ DOZE
+ b .
+
+
+_GLOBAL(idle_spin)
+ blr
+
+_GLOBAL(idle_doze)
+ LOAD_REG_ADDR(r3, _doze)
+ b sleep_common
+
+/* Add more modes here later */
+
+sleep_common:
+ mflr r0
+ std r0, 16(r1)
+ stdu r1,-64(r1)
+
+ LOAD_REG_IMMEDIATE(r6,MSR_DR|MSR_IR|MSR_ME|MSR_EE)
+ mfmsr r4
+ andc r5,r4,r6
+ mtmsrd r5,0
+
+ mtctr r3
+ bctrl
+
+ mtmsrd r4,0
+
+ addi r1,r1,64
+ ld r0,16(r1)
+ mtlr r0
+ blr
+
Index: merge/include/asm-powerpc/reg.h
===================================================================
--- merge.orig/include/asm-powerpc/reg.h
+++ merge/include/asm-powerpc/reg.h
@@ -166,6 +166,7 @@
#define SPRN_TBWU 0x11D /* Time Base Upper Register (super, R/W) */
#define SPRN_SPURR 0x134 /* Scaled PURR */
#define SPRN_HIOR 0x137 /* 970 Hypervisor interrupt offset */
+#define SPRN_LPCR 0x13E /* LPAR Control Register */
#define SPRN_DBAT0L 0x219 /* Data BAT 0 Lower Register */
#define SPRN_DBAT0U 0x218 /* Data BAT 0 Upper Register */
#define SPRN_DBAT1L 0x21B /* Data BAT 1 Lower Register */
--
next prev parent reply other threads:[~2007-02-02 5:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-02 4:54 [PATCH] [0/9] PA Semi patches Olof Johansson
2007-02-02 4:54 ` [PATCH] [1/9] pasemi: Default root device Olof Johansson
2007-02-02 22:28 ` Geoff Levand
2007-02-04 22:18 ` Olof Johansson
2007-02-04 22:37 ` Olof Johansson
2007-02-02 4:54 ` [PATCH] [2/9] pasemi: UART udbg support Olof Johansson
2007-02-02 4:54 ` [PATCH] [3/9] pasemi: Machine check handler Olof Johansson
2007-02-04 23:49 ` Benjamin Herrenschmidt
2007-02-05 4:19 ` Olof Johansson
2007-02-02 4:54 ` Olof Johansson [this message]
2007-02-03 8:27 ` [PATCH] [4/9] pasemi: Idle loops Arnd Bergmann
2007-02-04 22:25 ` Olof Johansson
2007-02-02 4:54 ` [PATCH] [5/9] pasemi: Implement restart Olof Johansson
2007-02-02 6:07 ` Kumar Gala
2007-02-02 18:46 ` Olof Johansson
2007-02-02 4:54 ` [PATCH] [6/9] pasemi: SMP timebase sync Olof Johansson
2007-02-02 4:54 ` [PATCH] [7/9] pasemi: Configure DMA controller interrupts Olof Johansson
2007-02-04 23:53 ` Benjamin Herrenschmidt
2007-02-05 4:52 ` Olof Johansson
2007-02-02 4:54 ` [PATCH] [8/9] pasemi: iommu support Olof Johansson
2007-02-02 4:54 ` [PATCH] [9/9] pasemi: defconfig Olof Johansson
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