[POWERPC] pasemi: Idle loops
authorOlof Johansson <olof@lixom.net>
Sun, 4 Feb 2007 22:36:51 +0000 (16:36 -0600)
committerPaul Mackerras <paulus@samba.org>
Wed, 7 Feb 2007 03:03:22 +0000 (14:03 +1100)
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>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
arch/powerpc/kernel/Makefile
arch/powerpc/kernel/cpu_setup_pa6t.S [new file with mode: 0644]
arch/powerpc/kernel/cputable.c
arch/powerpc/platforms/pasemi/Makefile
arch/powerpc/platforms/pasemi/idle.c [new file with mode: 0644]
arch/powerpc/platforms/pasemi/pasemi.h
arch/powerpc/platforms/pasemi/powersave.S [new file with mode: 0644]
arch/powerpc/platforms/pasemi/setup.c
include/asm-powerpc/reg.h

index d2ded19e40643f4b7bafdaa28ba89ad0b443462d..8120d428ebfdf0e2cf51beb8d2106a6bd1ddaa0a 100644 (file)
@@ -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
diff --git a/arch/powerpc/kernel/cpu_setup_pa6t.S b/arch/powerpc/kernel/cpu_setup_pa6t.S
new file mode 100644 (file)
index 0000000..4047be2
--- /dev/null
@@ -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 4939b3d56dfbd2ea2c3601a9c299b933cee97f99..dd17dffbf05863fea22ab3c65133a0d1dd0a17ef 100644 (file)
@@ -43,6 +43,8 @@ extern void __setup_cpu_745x(unsigned long offset, struct cpu_spec* spec);
 #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 1be1a993c5f529c670e76b34e90519b64b0f877b..fe4da46074bbc8c7199c9806b666c666e52d83bc 100644 (file)
@@ -1 +1,2 @@
-obj-y  += setup.o pci.o time.o
+obj-y  += setup.o pci.o time.o idle.o powersave.o
+
diff --git a/arch/powerpc/platforms/pasemi/idle.c b/arch/powerpc/platforms/pasemi/idle.c
new file mode 100644 (file)
index 0000000..1ca3ff3
--- /dev/null
@@ -0,0 +1,88 @@
+/*
+ * 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 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.system_reset_exception = pasemi_system_reset_exception;
+       ppc_md.power_save = modes[current_mode].entry;
+       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 51c2a2397ecf100b8caba82c46c6b3af827f8309..94fd00cc6a10fdf023e270bf144b00bf5717ddd5 100644 (file)
@@ -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 */
diff --git a/arch/powerpc/platforms/pasemi/powersave.S b/arch/powerpc/platforms/pasemi/powersave.S
new file mode 100644 (file)
index 0000000..6d0fba6
--- /dev/null
@@ -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 4142873a87ef504080046aeaf28495163e2dda89..f69f5e76618f6dcdcf056d6c4ee9e617da8dafe6 100644 (file)
@@ -82,7 +82,7 @@ void __init pas_setup_arch(void)
        conswitchp = &dummy_con;
 #endif
 
-       printk(KERN_DEBUG "Using default idle loop\n");
+       pasemi_idle_init();
 }
 
 /* No legacy IO on our parts */
index 0279d4ec5211ddfa5579dd81e8be12841f54503a..923df6ceaa5c418b40251d2b3f083ca29a42bd5e 100644 (file)
 #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 */