unicore32 additional architecture files: pm related files

This patch adds pm related files, including hibernate and sleep supports.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>

8 files changed, 1156 insertions, 0 deletions

diff --git a/arch/unicore32/include/asm/suspend.h b/arch/unicore32/include/asm/suspend.h
new file mode 100644
index 00000000000..88a9c0f32b2
--- /dev/null
+++ b/arch/unicore32/include/asm/suspend.h
@@ -0,0 +1,30 @@
+/*
+ * linux/arch/unicore32/include/asm/suspend.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ */
+
+#ifndef __UNICORE_SUSPEND_H__
+#define __UNICORE_SUSPEND_H__
+
+#ifndef __ASSEMBLY__
+static inline int arch_prepare_suspend(void) { return 0; }
+
+#include <asm/ptrace.h>
+
+struct swsusp_arch_regs {
+        struct cpu_context_save cpu_context;    /* cpu context */
+#ifdef CONFIG_UNICORE_FPU_F64
+        struct fp_state         fpstate __attribute__((aligned(8)));
+#endif
+};
+#endif
+
+#endif /* __UNICORE_SUSPEND_H__ */
+
diff --git a/arch/unicore32/include/mach/pm.h b/arch/unicore32/include/mach/pm.h
new file mode 100644
index 00000000000..4dcd34ae194
--- /dev/null
+++ b/arch/unicore32/include/mach/pm.h
@@ -0,0 +1,43 @@
+/*
+ * linux/arch/unicore/include/mach/pm.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ */
+#ifndef __PUV3_PM_H__
+#define __PUV3_PM_H__
+
+#include <linux/suspend.h>
+
+struct puv3_cpu_pm_fns {
+        int     save_count;
+        void    (*save)(unsigned long *);
+        void    (*restore)(unsigned long *);
+        int     (*valid)(suspend_state_t state);
+        void    (*enter)(suspend_state_t state);
+        int     (*prepare)(void);
+        void    (*finish)(void);
+};
+
+extern struct puv3_cpu_pm_fns *puv3_cpu_pm_fns;
+
+/* sleep.S */
+extern void puv3_cpu_suspend(unsigned int);
+
+extern void puv3_cpu_resume(void);
+
+extern int puv3_pm_enter(suspend_state_t state);
+
+/* Defined in hibernate_asm.S */
+extern int restore_image(pgd_t *resume_pg_dir, struct pbe *restore_pblist);
+
+/* References to section boundaries */
+extern const void __nosave_begin, __nosave_end;
+
+extern struct pbe *restore_pblist;
+#endif
diff --git a/arch/unicore32/kernel/clock.c b/arch/unicore32/kernel/clock.c
new file mode 100644
index 00000000000..80323db581f
--- /dev/null
+++ b/arch/unicore32/kernel/clock.c
@@ -0,0 +1,388 @@
+/*
+ * linux/arch/unicore32/kernel/clock.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *      Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+
+#include <mach/hardware.h>
+
+/*
+ * Very simple clock implementation
+ */
+struct clk {
+        struct list_head        node;
+        unsigned long           rate;
+        const char              *name;
+};
+
+static struct clk clk_ost_clk = {
+        .name           = "OST_CLK",
+        .rate           = CLOCK_TICK_RATE,
+};
+
+static struct clk clk_mclk_clk = {
+        .name           = "MAIN_CLK",
+};
+
+static struct clk clk_bclk32_clk = {
+        .name           = "BUS32_CLK",
+};
+
+static struct clk clk_ddr_clk = {
+        .name           = "DDR_CLK",
+};
+
+static struct clk clk_vga_clk = {
+        .name           = "VGA_CLK",
+};
+
+static LIST_HEAD(clocks);
+static DEFINE_MUTEX(clocks_mutex);
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+        struct clk *p, *clk = ERR_PTR(-ENOENT);
+
+        mutex_lock(&clocks_mutex);
+        list_for_each_entry(p, &clocks, node) {
+                if (strcmp(id, p->name) == 0) {
+                        clk = p;
+                        break;
+                }
+        }
+        mutex_unlock(&clocks_mutex);
+
+        return clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_enable(struct clk *clk)
+{
+        return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+        return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+struct {
+        unsigned long rate;
+        unsigned long cfg;
+        unsigned long div;
+} vga_clk_table[] = {
+        {.rate =  25175000, .cfg = 0x00002001, .div = 0x9},
+        {.rate =  31500000, .cfg = 0x00002001, .div = 0x7},
+        {.rate =  40000000, .cfg = 0x00003801, .div = 0x9},
+        {.rate =  49500000, .cfg = 0x00003801, .div = 0x7},
+        {.rate =  65000000, .cfg = 0x00002c01, .div = 0x4},
+        {.rate =  78750000, .cfg = 0x00002400, .div = 0x7},
+        {.rate = 108000000, .cfg = 0x00002c01, .div = 0x2},
+        {.rate = 106500000, .cfg = 0x00003c01, .div = 0x3},
+        {.rate =  50650000, .cfg = 0x00106400, .div = 0x9},
+        {.rate =  61500000, .cfg = 0x00106400, .div = 0xa},
+        {.rate =  85500000, .cfg = 0x00002800, .div = 0x6},
+};
+
+struct {
+        unsigned long mrate;
+        unsigned long prate;
+} mclk_clk_table[] = {
+        {.mrate = 500000000, .prate = 0x00109801},
+        {.mrate = 525000000, .prate = 0x00104C00},
+        {.mrate = 550000000, .prate = 0x00105000},
+        {.mrate = 575000000, .prate = 0x00105400},
+        {.mrate = 600000000, .prate = 0x00105800},
+        {.mrate = 625000000, .prate = 0x00105C00},
+        {.mrate = 650000000, .prate = 0x00106000},
+        {.mrate = 675000000, .prate = 0x00106400},
+        {.mrate = 700000000, .prate = 0x00106800},
+        {.mrate = 725000000, .prate = 0x00106C00},
+        {.mrate = 750000000, .prate = 0x00107000},
+        {.mrate = 775000000, .prate = 0x00107400},
+        {.mrate = 800000000, .prate = 0x00107800},
+};
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+        if (clk == &clk_vga_clk) {
+                unsigned long pll_vgacfg, pll_vgadiv;
+                int ret, i;
+
+                /* lookup vga_clk_table */
+                ret = -EINVAL;
+                for (i = 0; i < ARRAY_SIZE(vga_clk_table); i++) {
+                        if (rate == vga_clk_table[i].rate) {
+                                pll_vgacfg = vga_clk_table[i].cfg;
+                                pll_vgadiv = vga_clk_table[i].div;
+                                ret = 0;
+                                break;
+                        }
+                }
+
+                if (ret)
+                        return ret;
+
+                if (PM_PLLVGACFG == pll_vgacfg)
+                        return 0;
+
+                /* set pll vga cfg reg. */
+                PM_PLLVGACFG = pll_vgacfg;
+
+                PM_PMCR = PM_PMCR_CFBVGA;
+                while ((PM_PLLDFCDONE & PM_PLLDFCDONE_VGADFC)
+                                != PM_PLLDFCDONE_VGADFC)
+                        udelay(100); /* about 1ms */
+
+                /* set div cfg reg. */
+                PM_PCGR |= PM_PCGR_VGACLK;
+
+                PM_DIVCFG = (PM_DIVCFG & ~PM_DIVCFG_VGACLK_MASK)
+                                | PM_DIVCFG_VGACLK(pll_vgadiv);
+
+                PM_SWRESET |= PM_SWRESET_VGADIV;
+                while ((PM_SWRESET & PM_SWRESET_VGADIV) == PM_SWRESET_VGADIV)
+                        udelay(100); /* 65536 bclk32, about 320us */
+
+                PM_PCGR &= ~PM_PCGR_VGACLK;
+        }
+#ifdef CONFIG_CPU_FREQ
+        if (clk == &clk_mclk_clk) {
+                u32 pll_rate, divstatus = PM_DIVSTATUS;
+                int ret, i;
+
+                /* lookup mclk_clk_table */
+                ret = -EINVAL;
+                for (i = 0; i < ARRAY_SIZE(mclk_clk_table); i++) {
+                        if (rate == mclk_clk_table[i].mrate) {
+                                pll_rate = mclk_clk_table[i].prate;
+                                clk_mclk_clk.rate = mclk_clk_table[i].mrate;
+                                ret = 0;
+                                break;
+                        }
+                }
+
+                if (ret)
+                        return ret;
+
+                if (clk_mclk_clk.rate)
+                        clk_bclk32_clk.rate = clk_mclk_clk.rate
+                                / (((divstatus & 0x0000f000) >> 12) + 1);
+
+                /* set pll sys cfg reg. */
+                PM_PLLSYSCFG = pll_rate;
+
+                PM_PMCR = PM_PMCR_CFBSYS;
+                while ((PM_PLLDFCDONE & PM_PLLDFCDONE_SYSDFC)
+                                != PM_PLLDFCDONE_SYSDFC)
+                        udelay(100);
+                        /* about 1ms */
+        }
+#endif
+        return 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_register(struct clk *clk)
+{
+        mutex_lock(&clocks_mutex);
+        list_add(&clk->node, &clocks);
+        mutex_unlock(&clocks_mutex);
+        printk(KERN_DEFAULT "PKUnity PM: %s %lu.%02luM\n", clk->name,
+                (clk->rate)/1000000, (clk->rate)/10000 % 100);
+        return 0;
+}
+EXPORT_SYMBOL(clk_register);
+
+void clk_unregister(struct clk *clk)
+{
+        mutex_lock(&clocks_mutex);
+        list_del(&clk->node);
+        mutex_unlock(&clocks_mutex);
+}
+EXPORT_SYMBOL(clk_unregister);
+
+struct {
+        unsigned long prate;
+        unsigned long rate;
+} pllrate_table[] = {
+        {.prate = 0x00002001, .rate = 250000000},
+        {.prate = 0x00104801, .rate = 250000000},
+        {.prate = 0x00104C01, .rate = 262500000},
+        {.prate = 0x00002401, .rate = 275000000},
+        {.prate = 0x00105001, .rate = 275000000},
+        {.prate = 0x00105401, .rate = 287500000},
+        {.prate = 0x00002801, .rate = 300000000},
+        {.prate = 0x00105801, .rate = 300000000},
+        {.prate = 0x00105C01, .rate = 312500000},
+        {.prate = 0x00002C01, .rate = 325000000},
+        {.prate = 0x00106001, .rate = 325000000},
+        {.prate = 0x00106401, .rate = 337500000},
+        {.prate = 0x00003001, .rate = 350000000},
+        {.prate = 0x00106801, .rate = 350000000},
+        {.prate = 0x00106C01, .rate = 362500000},
+        {.prate = 0x00003401, .rate = 375000000},
+        {.prate = 0x00107001, .rate = 375000000},
+        {.prate = 0x00107401, .rate = 387500000},
+        {.prate = 0x00003801, .rate = 400000000},
+        {.prate = 0x00107801, .rate = 400000000},
+        {.prate = 0x00107C01, .rate = 412500000},
+        {.prate = 0x00003C01, .rate = 425000000},
+        {.prate = 0x00108001, .rate = 425000000},
+        {.prate = 0x00108401, .rate = 437500000},
+        {.prate = 0x00004001, .rate = 450000000},
+        {.prate = 0x00108801, .rate = 450000000},
+        {.prate = 0x00108C01, .rate = 462500000},
+        {.prate = 0x00004401, .rate = 475000000},
+        {.prate = 0x00109001, .rate = 475000000},
+        {.prate = 0x00109401, .rate = 487500000},
+        {.prate = 0x00004801, .rate = 500000000},
+        {.prate = 0x00109801, .rate = 500000000},
+        {.prate = 0x00104C00, .rate = 525000000},
+        {.prate = 0x00002400, .rate = 550000000},
+        {.prate = 0x00105000, .rate = 550000000},
+        {.prate = 0x00105400, .rate = 575000000},
+        {.prate = 0x00002800, .rate = 600000000},
+        {.prate = 0x00105800, .rate = 600000000},
+        {.prate = 0x00105C00, .rate = 625000000},
+        {.prate = 0x00002C00, .rate = 650000000},
+        {.prate = 0x00106000, .rate = 650000000},
+        {.prate = 0x00106400, .rate = 675000000},
+        {.prate = 0x00003000, .rate = 700000000},
+        {.prate = 0x00106800, .rate = 700000000},
+        {.prate = 0x00106C00, .rate = 725000000},
+        {.prate = 0x00003400, .rate = 750000000},
+        {.prate = 0x00107000, .rate = 750000000},
+        {.prate = 0x00107400, .rate = 775000000},
+        {.prate = 0x00003800, .rate = 800000000},
+        {.prate = 0x00107800, .rate = 800000000},
+        {.prate = 0x00107C00, .rate = 825000000},
+        {.prate = 0x00003C00, .rate = 850000000},
+        {.prate = 0x00108000, .rate = 850000000},
+        {.prate = 0x00108400, .rate = 875000000},
+        {.prate = 0x00004000, .rate = 900000000},
+        {.prate = 0x00108800, .rate = 900000000},
+        {.prate = 0x00108C00, .rate = 925000000},
+        {.prate = 0x00004400, .rate = 950000000},
+        {.prate = 0x00109000, .rate = 950000000},
+        {.prate = 0x00109400, .rate = 975000000},
+        {.prate = 0x00004800, .rate = 1000000000},
+        {.prate = 0x00109800, .rate = 1000000000},
+};
+
+struct {
+        unsigned long prate;
+        unsigned long drate;
+} pddr_table[] = {
+        {.prate = 0x00100800, .drate = 44236800},
+        {.prate = 0x00100C00, .drate = 66355200},
+        {.prate = 0x00101000, .drate = 88473600},
+        {.prate = 0x00101400, .drate = 110592000},
+        {.prate = 0x00101800, .drate = 132710400},
+        {.prate = 0x00101C01, .drate = 154828800},
+        {.prate = 0x00102001, .drate = 176947200},
+        {.prate = 0x00102401, .drate = 199065600},
+        {.prate = 0x00102801, .drate = 221184000},
+        {.prate = 0x00102C01, .drate = 243302400},
+        {.prate = 0x00103001, .drate = 265420800},
+        {.prate = 0x00103401, .drate = 287539200},
+        {.prate = 0x00103801, .drate = 309657600},
+        {.prate = 0x00103C01, .drate = 331776000},
+        {.prate = 0x00104001, .drate = 353894400},
+};
+
+static int __init clk_init(void)
+{
+#ifdef CONFIG_PUV3_PM
+        u32 pllrate, divstatus = PM_DIVSTATUS;
+        u32 pcgr_val = PM_PCGR;
+        int i;
+
+        pcgr_val |= PM_PCGR_BCLKMME | PM_PCGR_BCLKH264E | PM_PCGR_BCLKH264D
+                        | PM_PCGR_HECLK | PM_PCGR_HDCLK;
+        PM_PCGR = pcgr_val;
+
+        pllrate = PM_PLLSYSSTATUS;
+
+        /* lookup pmclk_table */
+        clk_mclk_clk.rate = 0;
+        for (i = 0; i < ARRAY_SIZE(pllrate_table); i++) {
+                if (pllrate == pllrate_table[i].prate) {
+                        clk_mclk_clk.rate = pllrate_table[i].rate;
+                        break;
+                }
+        }
+
+        if (clk_mclk_clk.rate)
+                clk_bclk32_clk.rate = clk_mclk_clk.rate /
+                        (((divstatus & 0x0000f000) >> 12) + 1);
+
+        pllrate = PM_PLLDDRSTATUS;
+
+        /* lookup pddr_table */
+        clk_ddr_clk.rate = 0;
+        for (i = 0; i < ARRAY_SIZE(pddr_table); i++) {
+                if (pllrate == pddr_table[i].prate) {
+                        clk_ddr_clk.rate = pddr_table[i].drate;
+                        break;
+                }
+        }
+
+        pllrate = PM_PLLVGASTATUS;
+
+        /* lookup pvga_table */
+        clk_vga_clk.rate = 0;
+        for (i = 0; i < ARRAY_SIZE(pllrate_table); i++) {
+                if (pllrate == pllrate_table[i].prate) {
+                        clk_vga_clk.rate = pllrate_table[i].rate;
+                        break;
+                }
+        }
+
+        if (clk_vga_clk.rate)
+                clk_vga_clk.rate = clk_vga_clk.rate /
+                        (((divstatus & 0x00f00000) >> 20) + 1);
+
+        clk_register(&clk_vga_clk);
+#endif
+#ifdef CONFIG_ARCH_FPGA
+        clk_ddr_clk.rate = 33000000;
+        clk_mclk_clk.rate = 33000000;
+        clk_bclk32_clk.rate = 33000000;
+#endif
+        clk_register(&clk_ddr_clk);
+        clk_register(&clk_mclk_clk);
+        clk_register(&clk_bclk32_clk);
+        clk_register(&clk_ost_clk);
+        return 0;
+}
+core_initcall(clk_init);
diff --git a/arch/unicore32/kernel/cpu-ucv2.c b/arch/unicore32/kernel/cpu-ucv2.c
new file mode 100644
index 00000000000..4a99f62584c
--- /dev/null
+++ b/arch/unicore32/kernel/cpu-ucv2.c
@@ -0,0 +1,93 @@
+/*
+ * linux/arch/unicore32/kernel/cpu-ucv2.c: clock scaling for the UniCore-II
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *      Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+
+#include <mach/hardware.h>
+
+static struct cpufreq_driver ucv2_driver;
+
+/* make sure that only the "userspace" governor is run
+ * -- anything else wouldn't make sense on this platform, anyway.
+ */
+int ucv2_verify_speed(struct cpufreq_policy *policy)
+{
+        if (policy->cpu)
+                return -EINVAL;
+
+        cpufreq_verify_within_limits(policy,
+                        policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
+
+        return 0;
+}
+
+static unsigned int ucv2_getspeed(unsigned int cpu)
+{
+        struct clk *mclk = clk_get(NULL, "MAIN_CLK");
+
+        if (cpu)
+                return 0;
+        return clk_get_rate(mclk)/1000;
+}
+
+static int ucv2_target(struct cpufreq_policy *policy,
+                         unsigned int target_freq,
+                         unsigned int relation)
+{
+        unsigned int cur = ucv2_getspeed(0);
+        struct cpufreq_freqs freqs;
+        struct clk *mclk = clk_get(NULL, "MAIN_CLK");
+
+        cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+        if (!clk_set_rate(mclk, target_freq * 1000)) {
+                freqs.old = cur;
+                freqs.new = target_freq;
+                freqs.cpu = 0;
+        }
+
+        cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+        return 0;
+}
+
+static int __init ucv2_cpu_init(struct cpufreq_policy *policy)
+{
+        if (policy->cpu != 0)
+                return -EINVAL;
+        policy->cur = ucv2_getspeed(0);
+        policy->min = policy->cpuinfo.min_freq = 250000;
+        policy->max = policy->cpuinfo.max_freq = 1000000;
+        policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+        return 0;
+}
+
+static struct cpufreq_driver ucv2_driver = {
+        .flags          = CPUFREQ_STICKY,
+        .verify         = ucv2_verify_speed,
+        .target         = ucv2_target,
+        .get            = ucv2_getspeed,
+        .init           = ucv2_cpu_init,
+        .name           = "UniCore-II",
+};
+
+static int __init ucv2_cpufreq_init(void)
+{
+        return cpufreq_register_driver(&ucv2_driver);
+}
+
+arch_initcall(ucv2_cpufreq_init);
diff --git a/arch/unicore32/kernel/hibernate.c b/arch/unicore32/kernel/hibernate.c
new file mode 100644
index 00000000000..7d0f0b7983a
--- /dev/null
+++ b/arch/unicore32/kernel/hibernate.c
@@ -0,0 +1,160 @@
+/*
+ *  linux/arch/unicore32/kernel/hibernate.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *      Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ */
+
+#include <linux/gfp.h>
+#include <linux/suspend.h>
+#include <linux/bootmem.h>
+
+#include <asm/system.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/suspend.h>
+
+#include "mach/pm.h"
+
+/* Pointer to the temporary resume page tables */
+pgd_t *resume_pg_dir;
+
+struct swsusp_arch_regs swsusp_arch_regs_cpu0;
+
+/*
+ * Create a middle page table on a resume-safe page and put a pointer to it in
+ * the given global directory entry.  This only returns the gd entry
+ * in non-PAE compilation mode, since the middle layer is folded.
+ */
+static pmd_t *resume_one_md_table_init(pgd_t *pgd)
+{
+        pud_t *pud;
+        pmd_t *pmd_table;
+
+        pud = pud_offset(pgd, 0);
+        pmd_table = pmd_offset(pud, 0);
+
+        return pmd_table;
+}
+
+/*
+ * Create a page table on a resume-safe page and place a pointer to it in
+ * a middle page directory entry.
+ */
+static pte_t *resume_one_page_table_init(pmd_t *pmd)
+{
+        if (pmd_none(*pmd)) {
+                pte_t *page_table = (pte_t *)get_safe_page(GFP_ATOMIC);
+                if (!page_table)
+                        return NULL;
+
+                set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_KERNEL_TABLE));
+
+                BUG_ON(page_table != pte_offset_kernel(pmd, 0));
+
+                return page_table;
+        }
+
+        return pte_offset_kernel(pmd, 0);
+}
+
+/*
+ * This maps the physical memory to kernel virtual address space, a total
+ * of max_low_pfn pages, by creating page tables starting from address
+ * PAGE_OFFSET.  The page tables are allocated out of resume-safe pages.
+ */
+static int resume_physical_mapping_init(pgd_t *pgd_base)
+{
+        unsigned long pfn;
+        pgd_t *pgd;
+        pmd_t *pmd;
+        pte_t *pte;
+        int pgd_idx, pmd_idx;
+
+        pgd_idx = pgd_index(PAGE_OFFSET);
+        pgd = pgd_base + pgd_idx;
+        pfn = 0;
+
+        for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
+                pmd = resume_one_md_table_init(pgd);
+                if (!pmd)
+                        return -ENOMEM;
+
+                if (pfn >= max_low_pfn)
+                        continue;
+
+                for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD; pmd++, pmd_idx++) {
+                        pte_t *max_pte;
+
+                        if (pfn >= max_low_pfn)
+                                break;
+
+                        /* Map with normal page tables.
+                         * NOTE: We can mark everything as executable here
+                         */
+                        pte = resume_one_page_table_init(pmd);
+                        if (!pte)
+                                return -ENOMEM;
+
+                        max_pte = pte + PTRS_PER_PTE;
+                        for (; pte < max_pte; pte++, pfn++) {
+                                if (pfn >= max_low_pfn)
+                                        break;
+
+                                set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC));
+                        }
+                }
+        }
+
+        return 0;
+}
+
+static inline void resume_init_first_level_page_table(pgd_t *pg_dir)
+{
+}
+
+int swsusp_arch_resume(void)
+{
+        int error;
+
+        resume_pg_dir = (pgd_t *)get_safe_page(GFP_ATOMIC);
+        if (!resume_pg_dir)
+                return -ENOMEM;
+
+        resume_init_first_level_page_table(resume_pg_dir);
+        error = resume_physical_mapping_init(resume_pg_dir);
+        if (error)
+                return error;
+
+        /* We have got enough memory and from now on we cannot recover */
+        restore_image(resume_pg_dir, restore_pblist);
+        return 0;
+}
+
+/*
+ *      pfn_is_nosave - check if given pfn is in the 'nosave' section
+ */
+
+int pfn_is_nosave(unsigned long pfn)
+{
+        unsigned long begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
+        unsigned long end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
+
+        return (pfn >= begin_pfn) && (pfn < end_pfn);
+}
+
+void save_processor_state(void)
+{
+}
+
+void restore_processor_state(void)
+{
+        local_flush_tlb_all();
+}
diff --git a/arch/unicore32/kernel/hibernate_asm.S b/arch/unicore32/kernel/hibernate_asm.S
new file mode 100644
index 00000000000..cc3c65253c8
--- /dev/null
+++ b/arch/unicore32/kernel/hibernate_asm.S
@@ -0,0 +1,117 @@
+/*
+ * linux/arch/unicore32/kernel/hibernate_asm.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *      Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ */
+
+#include <linux/sys.h>
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <generated/asm-offsets.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/assembler.h>
+
+@ restore_image(pgd_t *resume_pg_dir, struct pbe *restore_pblist)
+@ r0: resume_pg_dir
+@ r1: restore_pblist
+@ copy restore_pblist pages
+@ restore registers from swsusp_arch_regs_cpu0
+@
+ENTRY(restore_image)
+        sub     r0, r0, #PAGE_OFFSET
+        mov     r5, #0
+        movc    p0.c6, r5, #6   @invalidate ITLB & DTLB
+        movc    p0.c2, r0, #0
+        nop
+        nop
+        nop
+        nop
+        nop
+        nop
+        nop
+
+        .p2align 4,,7
+101:
+        csub.a  r1, #0
+        beq     109f
+
+        ldw     r6, [r1+], #PBE_ADDRESS
+        ldw     r7, [r1+], #PBE_ORIN_ADDRESS
+
+        movl    ip, #128
+102:    ldm.w   (r8 - r15), [r6]+
+        stm.w   (r8 - r15), [r7]+
+        sub.a   ip, ip, #1
+        bne     102b
+
+        ldw     r1, [r1+], #PBE_NEXT
+        b       101b
+
+        .p2align 4,,7
+109:
+        /* go back to the original page tables */
+        ldw     r0, =swapper_pg_dir
+        sub     r0, r0, #PAGE_OFFSET
+        mov     r5, #0
+        movc    p0.c6, r5, #6
+        movc    p0.c2, r0, #0
+        nop
+        nop
+        nop
+        nop
+        nop
+        nop
+        nop
+
+#ifdef  CONFIG_UNICORE_FPU_F64
+        ldw     ip, 1f
+        add     ip, ip, #SWSUSP_FPSTATE
+        lfm.w   (f0  - f7 ), [ip]+
+        lfm.w   (f8  - f15), [ip]+
+        lfm.w   (f16 - f23), [ip]+
+        lfm.w   (f24 - f31), [ip]+
+        ldw     r4, [ip]
+        ctf     r4, s31
+#endif
+        mov     r0, #0x0
+        ldw     ip, 1f
+        add     ip, ip, #SWSUSP_CPU
+        ldm.w   (r4 - r15), [ip]+
+        ldm     (r16 - r27, sp, pc), [ip]+      @ Load all regs saved previously
+
+        .align  2
+1:      .long   swsusp_arch_regs_cpu0
+
+
+@ swsusp_arch_suspend()
+@ - prepare pc for resume, return from function without swsusp_save on resume
+@ - save registers in swsusp_arch_regs_cpu0
+@ - call swsusp_save write suspend image
+
+ENTRY(swsusp_arch_suspend)
+        ldw     ip, 1f
+        add     ip, ip, #SWSUSP_CPU
+        stm.w   (r4 - r15), [ip]+
+        stm.w   (r16 - r27, sp, lr), [ip]+
+
+#ifdef  CONFIG_UNICORE_FPU_F64
+        ldw     ip, 1f
+        add     ip, ip, #SWSUSP_FPSTATE
+        sfm.w   (f0  - f7 ), [ip]+
+        sfm.w   (f8  - f15), [ip]+
+        sfm.w   (f16 - f23), [ip]+
+        sfm.w   (f24 - f31), [ip]+
+        cff     r4, s31
+        stw     r4, [ip]
+#endif
+        b       swsusp_save                     @ no return
+
+1:      .long   swsusp_arch_regs_cpu0
diff --git a/arch/unicore32/kernel/pm.c b/arch/unicore32/kernel/pm.c
new file mode 100644
index 00000000000..784bc2db3b2
--- /dev/null
+++ b/arch/unicore32/kernel/pm.c
@@ -0,0 +1,123 @@
+/*
+ * linux/arch/unicore32/kernel/pm.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *      Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/pm.h>
+
+#include "setup.h"
+
+struct puv3_cpu_pm_fns *puv3_cpu_pm_fns;
+static unsigned long *sleep_save;
+
+int puv3_pm_enter(suspend_state_t state)
+{
+        unsigned long sleep_save_checksum = 0, checksum = 0;
+        int i;
+
+        /* skip registers saving for standby */
+        if (state != PM_SUSPEND_STANDBY) {
+                puv3_cpu_pm_fns->save(sleep_save);
+                /* before sleeping, calculate and save a checksum */
+                for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
+                        sleep_save_checksum += sleep_save[i];
+        }
+
+        /* *** go zzz *** */
+        puv3_cpu_pm_fns->enter(state);
+        cpu_init();
+#ifdef CONFIG_INPUT_KEYBOARD
+        puv3_ps2_init();
+#endif
+#ifdef CONFIG_PCI
+        pci_puv3_preinit();
+#endif
+        if (state != PM_SUSPEND_STANDBY) {
+                /* after sleeping, validate the checksum */
+                for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
+                        checksum += sleep_save[i];
+
+                /* if invalid, display message and wait for a hardware reset */
+                if (checksum != sleep_save_checksum) {
+                        while (1)
+                                puv3_cpu_pm_fns->enter(state);
+                }
+                puv3_cpu_pm_fns->restore(sleep_save);
+        }
+
+        pr_debug("*** made it back from resume\n");
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(puv3_pm_enter);
+
+unsigned long sleep_phys_sp(void *sp)
+{
+        return virt_to_phys(sp);
+}
+
+static int puv3_pm_valid(suspend_state_t state)
+{
+        if (puv3_cpu_pm_fns)
+                return puv3_cpu_pm_fns->valid(state);
+
+        return -EINVAL;
+}
+
+static int puv3_pm_prepare(void)
+{
+        int ret = 0;
+
+        if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare)
+                ret = puv3_cpu_pm_fns->prepare();
+
+        return ret;
+}
+
+static void puv3_pm_finish(void)
+{
+        if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish)
+                puv3_cpu_pm_fns->finish();
+}
+
+static struct platform_suspend_ops puv3_pm_ops = {
+        .valid          = puv3_pm_valid,
+        .enter          = puv3_pm_enter,
+        .prepare        = puv3_pm_prepare,
+        .finish         = puv3_pm_finish,
+};
+
+static int __init puv3_pm_init(void)
+{
+        if (!puv3_cpu_pm_fns) {
+                printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n");
+                return -EINVAL;
+        }
+
+        sleep_save = kmalloc(puv3_cpu_pm_fns->save_count
+                                * sizeof(unsigned long), GFP_KERNEL);
+        if (!sleep_save) {
+                printk(KERN_ERR "failed to alloc memory for pm save\n");
+                return -ENOMEM;
+        }
+
+        suspend_set_ops(&puv3_pm_ops);
+        return 0;
+}
+
+device_initcall(puv3_pm_init);
diff --git a/arch/unicore32/kernel/sleep.S b/arch/unicore32/kernel/sleep.S
new file mode 100644
index 00000000000..f7c3fc87f7f
--- /dev/null
+++ b/arch/unicore32/kernel/sleep.S
@@ -0,0 +1,202 @@
+/*
+ * linux/arch/unicore32/kernel/sleep.S
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
+ *      Copyright (C) 2001-2010 Guan Xuetao
+ *
+ * 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.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <mach/hardware.h>
+
+                .text
+
+pkunity_cpu_save_cp:
+
+        @ get coprocessor registers
+
+        movc    r3, p0.c7, #0                   @ PID
+        movc    r4, p0.c2, #0                   @ translation table base addr
+        movc    r5, p0.c1, #0                   @ control reg
+
+
+        @ store them plus current virtual stack ptr on stack
+        mov     r6, sp
+        stm.w   (r3 - r6), [sp-]
+
+        mov     pc, lr
+
+pkunity_cpu_save_sp:
+        @ preserve phys address of stack
+        mov     r0, sp
+        stw.w   lr, [sp+], #-4
+        b.l     sleep_phys_sp
+        ldw     r1, =sleep_save_sp
+        stw     r0, [r1]
+        ldw.w   pc, [sp]+, #4
+
+/*
+ * puv3_cpu_suspend()
+ *
+ * Forces CPU into sleep state.
+ *
+ * r0 = value for PWRMODE M field for desired sleep state
+ */
+
+ENTRY(puv3_cpu_suspend)
+        stm.w   (r16 - r27, lr), [sp-]          @ save registers on stack
+        stm.w   (r4 - r15), [sp-]               @ save registers on stack
+
+#ifdef  CONFIG_UNICORE_FPU_F64
+        sfm.w   (f0  - f7 ), [sp-]
+        sfm.w   (f8  - f15), [sp-]
+        sfm.w   (f16 - f23), [sp-]
+        sfm.w   (f24 - f31), [sp-]
+        cff     r4, s31
+        stm.w   (r4), [sp-]
+#endif
+        b.l     pkunity_cpu_save_cp
+
+        b.l     pkunity_cpu_save_sp
+
+        @ clean data cache
+        mov     r1, #0
+        movc    p0.c5, r1, #14
+        nop
+        nop
+        nop
+        nop
+
+
+
+        @ DDR2 BaseAddr
+        ldw     r0, =io_p2v(PKUNITY_DDR2CTRL_BASE)
+
+        @ PM BaseAddr
+        ldw     r1, =io_p2v(PKUNITY_PM_BASE)
+
+        @ set PLL_SYS_CFG reg, 275
+        movl    r6, #0x00002401
+        stw     r6, [r1+], #0x18
+        @ set PLL_DDR_CFG reg, 66MHz
+        movl    r6, #0x00100c00
+        stw     r6, [r1+], #0x1c
+
+        @ set wake up source
+        movl    r8, #0x800001ff         @ epip4d
+        stw     r8, [r1+], #0xc
+
+        @ set PGSR
+        movl    r5, #0x40000
+        stw     r5, [r1+], #0x10
+
+        @ prepare DDR2 refresh settings
+        ldw     r5, [r0+], #0x24
+        or      r5, r5, #0x00000001
+
+        @ prepare PMCR for PLL changing
+        movl    r6, #0xc
+
+        @ prepare for closing PLL
+        movl    r7, #0x1
+
+        @ prepare sleep mode
+        mov     r8, #0x1
+
+@       movl    r0, 0x11111111
+@       put_word_ocd r0
+        b       pkunity_cpu_do_suspend
+
+        .ltorg
+        .align  5
+pkunity_cpu_do_suspend:
+        b       101f
+        @ put DDR2 into self-refresh
+100:    stw     r5, [r0+], #0x24
+        @ change PLL
+        stw     r6, [r1]
+        b       1f
+
+        .ltorg
+        .align  5
+101:    b       102f
+        @ wait for PLL changing complete
+1:      ldw     r6, [r1+], #0x44
+        csub.a  r6, #0x1
+        bne     1b
+        b       2f
+
+        .ltorg
+        .align  5
+102:    b       100b
+        @ close PLL
+2:      stw     r7, [r1+], #0x4
+        @ enter sleep mode
+        stw     r8, [r1]
+3:      b       3b
+
+
+
+
+/*
+ * puv3_cpu_resume()
+ *
+ * entry point from bootloader into kernel during resume
+ *
+ * Note: Yes, part of the following code is located into the .data section.
+ *       This is to allow sleep_save_sp to be accessed with a relative load
+ *       while we can't rely on any MMU translation.  We could have put
+ *       sleep_save_sp in the .text section as well, but some setups might
+ *       insist on it to be truly read-only.
+ */
+
+        .data
+        .align 5
+ENTRY(puv3_cpu_resume)
+@       movl    r0, 0x20202020
+@       put_word_ocd r0
+
+        ldw     r0, sleep_save_sp               @ stack phys addr
+        ldw     r2, =resume_after_mmu           @ its absolute virtual address
+        ldm     (r3 - r6), [r0]+                @ CP regs + virt stack ptr
+        mov     sp, r6                          @ CP regs + virt stack ptr
+
+        mov     r1, #0
+        movc    p0.c6, r1, #6                   @ invalidate I & D TLBs
+        movc    p0.c5, r1, #28                  @ invalidate I & D caches, BTB
+
+        movc    p0.c7, r3, #0                   @ PID
+        movc    p0.c2, r4, #0                   @ translation table base addr
+        movc    p0.c1, r5, #0                   @ control reg, turn on mmu
+        nop
+        jump    r2
+        nop
+        nop
+        nop
+        nop
+        nop
+
+sleep_save_sp:
+        .word   0                               @ preserve stack phys ptr here
+
+        .text
+resume_after_mmu:
+@       movl    r0, 0x30303030
+@       put_word_ocd r0
+
+#ifdef  CONFIG_UNICORE_FPU_F64
+        lfm.w   (f0  - f7 ), [sp]+
+        lfm.w   (f8  - f15), [sp]+
+        lfm.w   (f16 - f23), [sp]+
+        lfm.w   (f24 - f31), [sp]+
+        ldm.w   (r4), [sp]+
+        ctf     r4, s31
+#endif
+        ldm.w   (r4 - r15), [sp]+               @ restore registers from stack
+        ldm.w   (r16 - r27, pc), [sp]+          @ return to caller