Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / vr41xx / common / pmu.c

diff --git a/kernel/arch/mips/vr41xx/common/pmu.c b/kernel/arch/mips/vr41xx/common/pmu.c
new file mode 100644 (file)
index 0000000..d7f7558
--- /dev/null
+++ b/kernel/arch/mips/vr41xx/common/pmu.c
@@ -0,0 +1,135 @@
+/*
+ *  pmu.c, Power Management Unit routines for NEC VR4100 series.
+ *
+ *  Copyright (C) 2003-2007  Yoichi Yuasa <yuasa@linux-mips.org>
+ *
+ *  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.
+ *
+ *  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 <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 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);