1 files changed, 123 insertions, 0 deletions
diff --git a/arch/mips/vr41xx/common/pmu.c b/arch/mips/vr41xx/common/pmu.c
new file mode 100644
index 000000000..93cc7e0b3
--- /dev/null
+++ b/arch/mips/vr41xx/common/pmu.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  pmu.c, Power Management Unit routines for NEC VR4100 series.
+ *
+ *  Copyright (C) 2003-2007  Yoichi Yuasa <yuasa@linux-mips.org>
+ */
+#include <linux/cpu.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/pm.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cpu.h>
+#include <asm/idle.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/reboot.h>
+
+#define PMU_TYPE1_BASE	0x0b0000a0UL
+#define PMU_TYPE1_SIZE	0x0eUL
+
+#define PMU_TYPE2_BASE	0x0f0000c0UL
+#define PMU_TYPE2_SIZE	0x10UL
+
+#define PMUCNT2REG	0x06
+ #define SOFTRST	0x0010
+
+static void __iomem *pmu_base;
+
+#define pmu_read(offset)		readw(pmu_base + (offset))
+#define pmu_write(offset, value)	writew((value), pmu_base + (offset))
+
+static void __cpuidle vr41xx_cpu_wait(void)
+{
+	local_irq_disable();
+	if (!need_resched())
+		/*
+		 * "standby" sets IE bit of the CP0_STATUS to 1.
+		 */
+		__asm__("standby;\n");
+	else
+		local_irq_enable();
+}
+
+static inline void software_reset(void)
+{
+	uint16_t pmucnt2;
+
+	switch (current_cpu_type()) {
+	case CPU_VR4122:
+	case CPU_VR4131:
+	case CPU_VR4133:
+		pmucnt2 = pmu_read(PMUCNT2REG);
+		pmucnt2 |= SOFTRST;
+		pmu_write(PMUCNT2REG, pmucnt2);
+		break;
+	default:
+		set_c0_status(ST0_BEV | ST0_ERL);
+		change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
+		__flush_cache_all();
+		write_c0_wired(0);
+		__asm__("jr	%0"::"r"(0xbfc00000));
+		break;
+	}
+}
+
+static void vr41xx_restart(char *command)
+{
+	local_irq_disable();
+	software_reset();
+	while (1) ;
+}
+
+static void vr41xx_halt(void)
+{
+	local_irq_disable();
+	printk(KERN_NOTICE "\nYou can turn off the power supply\n");
+	__asm__("hibernate;\n");
+}
+
+static int __init vr41xx_pmu_init(void)
+{
+	unsigned long start, size;
+
+	switch (current_cpu_type()) {
+	case CPU_VR4111:
+	case CPU_VR4121:
+		start = PMU_TYPE1_BASE;
+		size = PMU_TYPE1_SIZE;
+		break;
+	case CPU_VR4122:
+	case CPU_VR4131:
+	case CPU_VR4133:
+		start = PMU_TYPE2_BASE;
+		size = PMU_TYPE2_SIZE;
+		break;
+	default:
+		printk("Unexpected CPU of NEC VR4100 series\n");
+		return -ENODEV;
+	}
+
+	if (request_mem_region(start, size, "PMU") == NULL)
+		return -EBUSY;
+
+	pmu_base = ioremap(start, size);
+	if (pmu_base == NULL) {
+		release_mem_region(start, size);
+		return -EBUSY;
+	}
+
+	cpu_wait = vr41xx_cpu_wait;
+	_machine_restart = vr41xx_restart;
+	_machine_halt = vr41xx_halt;
+	pm_power_off = vr41xx_halt;
+
+	return 0;
+}
+
+core_initcall(vr41xx_pmu_init);