Initial import

1 files changed, 256 insertions, 0 deletions

diff --git a/arch/mips/kernel/idle.c b/arch/mips/kernel/idle.c
new file mode 100644
index 000000000..e4f62b787
--- /dev/null
+++ b/arch/mips/kernel/idle.c
@@ -0,0 +1,256 @@
+/*
+ * MIPS idle loop and WAIT instruction support.
+ *
+ * Copyright (C) xxxx  the Anonymous
+ * Copyright (C) 1994 - 2006 Ralf Baechle
+ * Copyright (C) 2003, 2004  Maciej W. Rozycki
+ * Copyright (C) 2001, 2004, 2011, 2012	 MIPS Technologies, Inc.
+ *
+ * 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/export.h>
+#include <linux/init.h>
+#include <linux/irqflags.h>
+#include <linux/printk.h>
+#include <linux/sched.h>
+#include <asm/cpu.h>
+#include <asm/cpu-info.h>
+#include <asm/cpu-type.h>
+#include <asm/idle.h>
+#include <asm/mipsregs.h>
+
+/*
+ * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
+ * the implementation of the "wait" feature differs between CPU families. This
+ * points to the function that implements CPU specific wait.
+ * The wait instruction stops the pipeline and reduces the power consumption of
+ * the CPU very much.
+ */
+void (*cpu_wait)(void);
+EXPORT_SYMBOL(cpu_wait);
+
+static void r3081_wait(void)
+{
+	unsigned long cfg = read_c0_conf();
+	write_c0_conf(cfg | R30XX_CONF_HALT);
+	local_irq_enable();
+}
+
+static void r39xx_wait(void)
+{
+	if (!need_resched())
+		write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
+	local_irq_enable();
+}
+
+void r4k_wait(void)
+{
+	local_irq_enable();
+	__r4k_wait();
+}
+
+/*
+ * This variant is preferable as it allows testing need_resched and going to
+ * sleep depending on the outcome atomically.  Unfortunately the "It is
+ * implementation-dependent whether the pipeline restarts when a non-enabled
+ * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
+ * using this version a gamble.
+ */
+void r4k_wait_irqoff(void)
+{
+	if (!need_resched())
+		__asm__(
+		"	.set	push		\n"
+		"	.set	arch=r4000	\n"
+		"	wait			\n"
+		"	.set	pop		\n");
+	local_irq_enable();
+}
+
+/*
+ * The RM7000 variant has to handle erratum 38.	 The workaround is to not
+ * have any pending stores when the WAIT instruction is executed.
+ */
+static void rm7k_wait_irqoff(void)
+{
+	if (!need_resched())
+		__asm__(
+		"	.set	push					\n"
+		"	.set	arch=r4000				\n"
+		"	.set	noat					\n"
+		"	mfc0	$1, $12					\n"
+		"	sync						\n"
+		"	mtc0	$1, $12		# stalls until W stage	\n"
+		"	wait						\n"
+		"	mtc0	$1, $12		# stalls until W stage	\n"
+		"	.set	pop					\n");
+	local_irq_enable();
+}
+
+/*
+ * Au1 'wait' is only useful when the 32kHz counter is used as timer,
+ * since coreclock (and the cp0 counter) stops upon executing it. Only an
+ * interrupt can wake it, so they must be enabled before entering idle modes.
+ */
+static void au1k_wait(void)
+{
+	unsigned long c0status = read_c0_status() | 1;	/* irqs on */
+
+	__asm__(
+	"	.set	arch=r4000			\n"
+	"	cache	0x14, 0(%0)		\n"
+	"	cache	0x14, 32(%0)		\n"
+	"	sync				\n"
+	"	mtc0	%1, $12			\n" /* wr c0status */
+	"	wait				\n"
+	"	nop				\n"
+	"	nop				\n"
+	"	nop				\n"
+	"	nop				\n"
+	"	.set	mips0			\n"
+	: : "r" (au1k_wait), "r" (c0status));
+}
+
+static int __initdata nowait;
+
+static int __init wait_disable(char *s)
+{
+	nowait = 1;
+
+	return 1;
+}
+
+__setup("nowait", wait_disable);
+
+void __init check_wait(void)
+{
+	struct cpuinfo_mips *c = &current_cpu_data;
+
+	if (nowait) {
+		printk("Wait instruction disabled.\n");
+		return;
+	}
+
+	switch (current_cpu_type()) {
+	case CPU_R3081:
+	case CPU_R3081E:
+		cpu_wait = r3081_wait;
+		break;
+	case CPU_TX3927:
+		cpu_wait = r39xx_wait;
+		break;
+	case CPU_R4200:
+/*	case CPU_R4300: */
+	case CPU_R4600:
+	case CPU_R4640:
+	case CPU_R4650:
+	case CPU_R4700:
+	case CPU_R5000:
+	case CPU_R5500:
+	case CPU_NEVADA:
+	case CPU_4KC:
+	case CPU_4KEC:
+	case CPU_4KSC:
+	case CPU_5KC:
+	case CPU_25KF:
+	case CPU_PR4450:
+	case CPU_BMIPS3300:
+	case CPU_BMIPS4350:
+	case CPU_BMIPS4380:
+	case CPU_BMIPS5000:
+	case CPU_CAVIUM_OCTEON:
+	case CPU_CAVIUM_OCTEON_PLUS:
+	case CPU_CAVIUM_OCTEON2:
+	case CPU_CAVIUM_OCTEON3:
+	case CPU_JZRISC:
+	case CPU_LOONGSON1:
+	case CPU_XLR:
+	case CPU_XLP:
+		cpu_wait = r4k_wait;
+		break;
+
+	case CPU_RM7000:
+		cpu_wait = rm7k_wait_irqoff;
+		break;
+
+	case CPU_PROAPTIV:
+	case CPU_P5600:
+		/*
+		 * Incoming Fast Debug Channel (FDC) data during a wait
+		 * instruction causes the wait never to resume, even if an
+		 * interrupt is received. Avoid using wait at all if FDC data is
+		 * likely to be received.
+		 */
+		if (IS_ENABLED(CONFIG_MIPS_EJTAG_FDC_TTY))
+			break;
+		/* fall through */
+	case CPU_M14KC:
+	case CPU_M14KEC:
+	case CPU_24K:
+	case CPU_34K:
+	case CPU_1004K:
+	case CPU_1074K:
+	case CPU_INTERAPTIV:
+	case CPU_M5150:
+	case CPU_QEMU_GENERIC:
+		cpu_wait = r4k_wait;
+		if (read_c0_config7() & MIPS_CONF7_WII)
+			cpu_wait = r4k_wait_irqoff;
+		break;
+
+	case CPU_74K:
+		cpu_wait = r4k_wait;
+		if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
+			cpu_wait = r4k_wait_irqoff;
+		break;
+
+	case CPU_TX49XX:
+		cpu_wait = r4k_wait_irqoff;
+		break;
+	case CPU_ALCHEMY:
+		cpu_wait = au1k_wait;
+		break;
+	case CPU_20KC:
+		/*
+		 * WAIT on Rev1.0 has E1, E2, E3 and E16.
+		 * WAIT on Rev2.0 and Rev3.0 has E16.
+		 * Rev3.1 WAIT is nop, why bother
+		 */
+		if ((c->processor_id & 0xff) <= 0x64)
+			break;
+
+		/*
+		 * Another rev is incremeting c0_count at a reduced clock
+		 * rate while in WAIT mode.  So we basically have the choice
+		 * between using the cp0 timer as clocksource or avoiding
+		 * the WAIT instruction.  Until more details are known,
+		 * disable the use of WAIT for 20Kc entirely.
+		   cpu_wait = r4k_wait;
+		 */
+		break;
+	default:
+		break;
+	}
+}
+
+void arch_cpu_idle(void)
+{
+	if (cpu_wait)
+		cpu_wait();
+	else
+		local_irq_enable();
+}
+
+#ifdef CONFIG_CPU_IDLE
+
+int mips_cpuidle_wait_enter(struct cpuidle_device *dev,
+			    struct cpuidle_driver *drv, int index)
+{
+	arch_cpu_idle();
+	return index;
+}
+
+#endif