PPC32: make the idle loop able to be platform-specific.

arch/ppc/kernel/Makefile

@@ -23,13 +23,13 @@ obj-y				:= entry.o traps.o irq.o idle.o time.o misc.o \
 					process.o signal.o ptrace.o align.o \
 					semaphore.o syscalls.o setup.o \
 					cputable.o ppc_htab.o
-obj-$(CONFIG_6xx)		+= l2cr.o
+obj-$(CONFIG_6xx)		+= l2cr.o ppc6xx_idle.o
+obj-$(CONFIG_ALL_PPC)		+= ppc6xx_idle.o
 obj-$(CONFIG_MODULES)		+= ppc_ksyms.o
 obj-$(CONFIG_PCI)		+= pci.o 
 ifneq ($(CONFIG_PPC_ISERIES),y)
 obj-$(CONFIG_PCI)		+= pci-dma.o
 endif
-obj-$(CONFIG_PPCBUG_NVRAM)	+= prep_nvram.o
 obj-$(CONFIG_KGDB)		+= ppc-stub.o
 obj-$(CONFIG_SMP)		+= smp.o
 obj-$(CONFIG_TAU)		+= temp.o

arch/ppc/kernel/iSeries_idle.c

+/*
+ * BK Id: %F% %I% %G% %U% %#%
+ */
+/*
+ * Idle task for iSeries.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/cache.h>
+#include <asm/cputable.h>
+#include <asm/machdep.h>
+#include <asm/time.h>
+#include <asm/iSeries/LparData.h>
+#include <asm/iSeries/HvCall.h>
+#include <asm/hardirq.h>
+
+static void yield_shared_processor(void);
+static void run_light_on(int on);
+
+extern unsigned long yield_count;
+
+void iSeries_idle(void)
+{
+	if (!need_resched()) {
+		/* Turn off the run light */
+		run_light_on(0);
+		yield_shared_processor(); 
+		HMT_low();
+
+#ifdef CONFIG_SMP
+		set_thread_flag(TIF_POLLING_NRFLAG);
+		while (!need_resched())
+			barrier();
+		clear_thread_flag(TIF_POLLING_NRFLAG);
+#endif
+	}
+
+	if (need_resched()) {
+		run_light_on(1);
+		schedule();
+		return;
+	}
+
+}
+
+extern void fake_interrupt(void);
+extern u64  get_tb64(void);
+
+static void run_light_on(int on)
+{
+	unsigned long CTRL;
+
+	CTRL = mfspr(CTRLF);
+	CTRL = on? (CTRL | RUNLATCH): (CTRL & ~RUNLATCH);
+	mtspr(CTRLT, CTRL);
+}
+
+static void yield_shared_processor(void)
+{
+	struct Paca *paca;
+	u64 tb;
+
+	/* Poll for I/O events */
+	local_irq_disable();
+	local_irq_enable();
+	
+	paca = (struct Paca *)mfspr(SPRG1);
+	if ( paca->xLpPaca.xSharedProc ) {
+		HvCall_setEnabledInterrupts( HvCall_MaskIPI |
+                        HvCall_MaskLpEvent |
+                        HvCall_MaskLpProd |
+                        HvCall_MaskTimeout );
+
+		/*
+		 * Check here for any of the above pending...
+		 * IPI and Decrementers are indicated in ItLpPaca
+		 * LpEvents are indicated on the LpQueue
+		 *
+		 * Disabling/enabling will check for LpEvents, IPIs
+		 * and decrementers
+		 */
+		local_irq_disable();
+		local_irq_enable();
+
+		++yield_count;
+
+		/* Get current tb value */
+		tb = get_tb64();
+		/* Compute future tb value when yield will expire */
+		tb += tb_ticks_per_jiffy;
+		HvCall_yieldProcessor( HvCall_YieldTimed, tb );
+
+		/* Check here for any of the above pending or timeout expired*/
+		local_irq_disable();
+		/*
+		 * The decrementer stops during the yield.  Just force
+		 * a fake decrementer now and the timer_interrupt
+		 * code will straighten it all out
+		 */
+		paca->xLpPaca.xDecrInt = 1;
+		local_irq_enable();
+	}
+}

arch/ppc/kernel/idle.c

@@ -2,7 +2,8 @@
  * Idle daemon for PowerPC.  Idle daemon will handle any action
  * that needs to be taken when the system becomes idle.
  *
- * Written by Cort Dougan (cort@cs.nmt.edu)
+ * Written by Cort Dougan (cort@cs.nmt.edu).  Subsequently hacked
+ * on by Tom Rini, Armin Kuster, Paul Mackerras and others.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -29,175 +30,39 @@
 #include <asm/mmu.h>
 #include <asm/cache.h>
 #include <asm/cputable.h>
-#ifdef CONFIG_PPC_ISERIES
-#include <asm/time.h>
-#include <asm/iSeries/LparData.h>
-#include <asm/iSeries/HvCall.h>
-#include <asm/hardirq.h>
-
-static void yield_shared_processor(void);
-static void run_light_on(int on);
-
-extern unsigned long yield_count;
-
-#else /* CONFIG_PPC_ISERIES */
-#define run_light_on(x)         do { } while (0)
-#endif /* CONFIG_PPC_ISERIES */
-
-void power_save(void);
-
-unsigned long zero_paged_on;
-unsigned long powersave_nap;
+#include <asm/machdep.h>
 
 void default_idle(void)
 {
-	int do_power_save = 0;
+	void (*powersave)(void);
 
-	/* Check if CPU can powersave */
-	if (cur_cpu_spec[smp_processor_id()]->cpu_features &
-		(CPU_FTR_CAN_DOZE | CPU_FTR_CAN_NAP))
-		do_power_save = 1;
+	powersave = ppc_md.power_save;
 
-#ifdef CONFIG_PPC_ISERIES
-	if (!current->need_resched) {
-		/* Turn off the run light */
-		run_light_on(0);
-		yield_shared_processor(); 
-	}
-	HMT_low();
-#endif
-#ifdef CONFIG_SMP
-	if (!do_power_save) {
 	if (!need_resched()) {
+		if (powersave != NULL)
+			powersave();
+#ifdef CONFIG_SMP
+		else {
 			set_thread_flag(TIF_POLLING_NRFLAG);
-			while (!test_thread_flag(TIF_NEED_RESCHED))
+			while (!need_resched())
 				barrier();
 			clear_thread_flag(TIF_POLLING_NRFLAG);
 		}
-	}
 #endif
-	if (do_power_save && !need_resched())
-		power_save();
-
-	if (need_resched()) {
-		run_light_on(1);
-		schedule();
-	}
-#ifdef CONFIG_PPC_ISERIES
-	else {
-		run_light_on(0);
-		yield_shared_processor();
-		HMT_low();
 	}
-#endif /* CONFIG_PPC_ISERIES */
+	if (need_resched())
+		schedule();
 }
 
 /*
- * SMP entry into the idle task - calls the same thing as the
- * non-smp versions. -- Cort
+ * The body of the idle task.
  */
 int cpu_idle(void)
 {
 	for (;;)
+		if (ppc_md.idle != NULL)
+			ppc_md.idle();
+		else
 			default_idle();
 	return 0; 
 }
-
-void power_save(void)
-{
-	unsigned long hid0;
-	int nap = powersave_nap;
-	
-	/* 7450 has no DOZE mode mode, we return if powersave_nap
-	 * isn't enabled
-	 */
-	if (!(nap || (cur_cpu_spec[smp_processor_id()]->cpu_features & CPU_FTR_CAN_DOZE)))
-		return;
-	/*
-	 * Disable interrupts to prevent a lost wakeup
-	 * when going to sleep.  This is necessary even with
-	 * RTLinux since we are not guaranteed an interrupt
-	 * didn't come in and is waiting for a local_irq_enable() before
-	 * emulating one.  This way, we really do hard disable.
-	 * 
-	 * We assume that we're sti-ed when we come in here.  We
-	 * are in the idle loop so if we're cli-ed then it's a bug
-	 * anyway.
-	 *  -- Cort
-	 */
-	_nmask_and_or_msr(MSR_EE, 0);
-	if (!need_resched())
-	{
-		asm("mfspr %0,1008" : "=r" (hid0) :);
-		hid0 &= ~(HID0_NAP | HID0_SLEEP | HID0_DOZE);
-		hid0 |= (powersave_nap? HID0_NAP: HID0_DOZE) | HID0_DPM;
-		asm("mtspr 1008,%0" : : "r" (hid0));
-		
-		/* set the POW bit in the MSR, and enable interrupts
-		 * so we wake up sometime! */
-		_nmask_and_or_msr(0, MSR_POW | MSR_EE);
-	}
-	_nmask_and_or_msr(0, MSR_EE);
-}
-
-#ifdef CONFIG_PPC_ISERIES
-
-extern void fake_interrupt(void);
-extern u64  get_tb64(void);
-
-void run_light_on(int on)
-{
-	unsigned long CTRL;
-
-	CTRL = mfspr(CTRLF);
-	CTRL = on? (CTRL | RUNLATCH): (CTRL & ~RUNLATCH);
-	mtspr(CTRLT, CTRL);
-}
-
-void yield_shared_processor(void)
-{
-	struct Paca *paca;
-	u64 tb;
-
-	/* Poll for I/O events */
-	local_irq_disable();
-	local_irq_enable();
-	
-	paca = (struct Paca *)mfspr(SPRG1);
-	if ( paca->xLpPaca.xSharedProc ) {
-		HvCall_setEnabledInterrupts( HvCall_MaskIPI |
-                        HvCall_MaskLpEvent |
-                        HvCall_MaskLpProd |
-                        HvCall_MaskTimeout );
-
-		/*
-		 * Check here for any of the above pending...
-		 * IPI and Decrementers are indicated in ItLpPaca
-		 * LpEvents are indicated on the LpQueue
-		 *
-		 * Disabling/enabling will check for LpEvents, IPIs
-		 * and decrementers
-		 */
-		local_irq_disable();
-		local_irq_enable();
-
-		++yield_count;
-
-		/* Get current tb value */
-		tb = get_tb64();
-		/* Compute future tb value when yield will expire */
-		tb += tb_ticks_per_jiffy;
-		HvCall_yieldProcessor( HvCall_YieldTimed, tb );
-
-		/* Check here for any of the above pending or timeout expired*/
-		local_irq_disable();
-		/*
-		 * The decrementer stops during the yield.  Just force
-		 * a fake decrementer now and the timer_interrupt
-		 * code will straighten it all out
-		 */
-		paca->xLpPaca.xDecrInt = 1;
-		local_irq_enable();
-	}
-}
-#endif /* CONFIG_PPC_ISERIES */

arch/ppc/kernel/ppc6xx_idle.c

+/*
+ * BK Id: %F% %I% %G% %U% %#%
+ */
+/*
+ * power_save() rountine for classic PPC CPUs.
+ *
+ * Written by Cort Dougan (cort@cs.nmt.edu)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/stringify.h>
+
+#include <asm/cputable.h>
+#include <asm/current.h>
+#include <asm/processor.h>
+
+unsigned long powersave_nap = 0;
+
+#define DSSALL		.long	(0x1f<<26)+(0x10<<21)+(0x336<<1)
+
+void
+ppc6xx_idle(void)
+{
+	unsigned long hid0;
+	int nap = powersave_nap;
+
+	/* 7450 has no DOZE mode mode, we return if powersave_nap
+	 * isn't enabled
+	 */
+	if (!(nap || (cur_cpu_spec[smp_processor_id()]->cpu_features
+		      & CPU_FTR_CAN_DOZE)))
+		return;
+	/*
+	 * Disable interrupts to prevent a lost wakeup
+	 * when going to sleep.  This is necessary even with
+	 * RTLinux since we are not guaranteed an interrupt
+	 * didn't come in and is waiting for a __sti() before
+	 * emulating one.  This way, we really do hard disable.
+	 *
+	 * We assume that we're sti-ed when we come in here.  We
+	 * are in the idle loop so if we're cli-ed then it's a bug
+	 * anyway.
+	 *  -- Cort
+	 */
+	_nmask_and_or_msr(MSR_EE, 0);
+	if (!need_resched()) {
+		__asm__ __volatile__("mfspr %0,1008":"=r"(hid0):);
+		hid0 &= ~(HID0_NAP | HID0_SLEEP | HID0_DOZE);
+		hid0 |= (powersave_nap ? HID0_NAP : HID0_DOZE) | HID0_DPM;
+		__asm__ __volatile__("mtspr 1008,%0"::"r"(hid0));
+		/* Flush pending data streams, consider this instruction
+		 * exist on all altivec capable CPUs
+		 */
+		__asm__ __volatile__("98:	" __stringify(DSSALL) "\n"
+				     "	sync\n"
+				     "99:\n"
+				     ".section __ftr_fixup,\"a\"\n"
+				     "	.long %0\n"
+				     "	.long %1\n"
+				     "	.long 98b\n"
+				     "	.long 99b\n"
+				     ".previous"::"i"
+				     (CPU_FTR_ALTIVEC), "i"(CPU_FTR_ALTIVEC));
+
+		/* set the POW bit in the MSR, and enable interrupts
+		 * so we wake up sometime! */
+		_nmask_and_or_msr(0, MSR_POW | MSR_EE);
+	}
+	_nmask_and_or_msr(0, MSR_EE);
+}

arch/ppc/kernel/setup.c

@@ -54,6 +54,8 @@ extern void xmon_map_scc(void);
 extern void kgdb_map_scc(void);
 #endif
 
+extern void ppc6xx_idle(void);
+
 extern boot_infos_t *boot_infos;
 char saved_command_line[256];
 unsigned char aux_device_present;
@@ -528,6 +530,10 @@ machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 	strcpy(cmd_line, CONFIG_CMDLINE);
 #endif /* CONFIG_CMDLINE */
 
+#if defined(CONFIG_6xx) || defined(CONFIG_ALL_PPC)
+	ppc_md.power_save = ppc6xx_idle;
+#endif
+
 	platform_init(r3, r4, r5, r6, r7);
 
 	if (ppc_md.progress)

arch/ppc/platforms/iSeries_setup.c

@@ -57,6 +57,7 @@ static void setup_iSeries_cache_sizes( void );
 extern void iSeries_pci_Initialize(void);
 static int iSeries_show_cpuinfo(struct seq_file *m);
 static int iSeries_show_percpuinfo(struct seq_file *m, int i);
+extern void iSeries_idle(void);
 extern struct pci_ops iSeries_pci_ops;
 
 /* Global Variables */
@@ -537,6 +538,8 @@ iSeries_setup_arch(void)
 	mf_init();
 	viopath_init();
 */
+
+	ppc_md.idle = iSeries_idle;
 }
 
 /*

include/asm-ppc/machdep.h

@@ -37,6 +37,9 @@ struct machdep_calls {
 	void		(*power_off)(void);
 	void		(*halt)(void);
 
+	void		(*idle)(void);
+	void		(*power_save)(void);
+
 	long		(*time_init)(void); /* Optional, may be NULL */
 	int		(*set_rtc_time)(unsigned long nowtime);
 	unsigned long	(*get_rtc_time)(void);