10 files changed, 352 insertions, 46 deletions

diff --git a/arch/avr32/kernel/Makefile b/arch/avr32/kernel/Makefile
index 2d6d48f35f69..e4b6d122b033 100644
--- a/arch/avr32/kernel/Makefile
+++ b/arch/avr32/kernel/Makefile
@@ -6,9 +6,10 @@ extra-y				:= head.o vmlinux.lds
 
 obj-$(CONFIG_SUBARCH_AVR32B)    += entry-avr32b.o
 obj-y                           += syscall_table.o syscall-stubs.o irq.o
-obj-y                           += setup.o traps.o semaphore.o ptrace.o
+obj-y                           += setup.o traps.o semaphore.o ocd.o ptrace.o
 obj-y                           += signal.o sys_avr32.o process.o time.o
 obj-y                           += init_task.o switch_to.o cpu.o
 obj-$(CONFIG_MODULES)           += module.o avr32_ksyms.o
 obj-$(CONFIG_KPROBES)           += kprobes.o
 obj-$(CONFIG_STACKTRACE)        += stacktrace.o
+obj-$(CONFIG_NMI_DEBUGGING)     += nmi_debug.o
diff --git a/arch/avr32/kernel/cpu.c b/arch/avr32/kernel/cpu.c
index 2714cf6452b5..b8409caeb23d 100644
--- a/arch/avr32/kernel/cpu.c
+++ b/arch/avr32/kernel/cpu.c
@@ -13,6 +13,7 @@
 #include <linux/percpu.h>
 #include <linux/param.h>
 #include <linux/errno.h>
+#include <linux/clk.h>
 
 #include <asm/setup.h>
 #include <asm/sysreg.h>
@@ -187,9 +188,20 @@ static int __init topology_init(void)
 
 subsys_initcall(topology_init);
 
+struct chip_id_map {
+        u16     mid;
+        u16     pn;
+        const char *name;
+};
+
+static const struct chip_id_map chip_names[] = {
+        { .mid = 0x1f, .pn = 0x1e82, .name = "AT32AP700x" },
+};
+#define NR_CHIP_NAMES ARRAY_SIZE(chip_names)
+
 static const char *cpu_names[] = {
         "Morgan",
-        "AP7000",
+        "AP7",
 };
 #define NR_CPU_NAMES ARRAY_SIZE(cpu_names)
 
@@ -206,12 +218,32 @@ static const char *mmu_types[] = {
         "MPU"
 };
 
+static const char *cpu_feature_flags[] = {
+        "rmw", "dsp", "simd", "ocd", "perfctr", "java", "fpu",
+};
+
+static const char *get_chip_name(struct avr32_cpuinfo *cpu)
+{
+        unsigned int i;
+        unsigned int mid = avr32_get_manufacturer_id(cpu);
+        unsigned int pn = avr32_get_product_number(cpu);
+
+        for (i = 0; i < NR_CHIP_NAMES; i++) {
+                if (chip_names[i].mid == mid && chip_names[i].pn == pn)
+                        return chip_names[i].name;
+        }
+
+        return "(unknown)";
+}
+
 void __init setup_processor(void)
 {
         unsigned long config0, config1;
         unsigned long features;
         unsigned cpu_id, cpu_rev, arch_id, arch_rev, mmu_type;
+        unsigned device_id;
         unsigned tmp;
+        unsigned i;
 
         config0 = sysreg_read(CONFIG0);
         config1 = sysreg_read(CONFIG1);
@@ -221,11 +253,14 @@ void __init setup_processor(void)
         arch_rev = SYSREG_BFEXT(AR, config0);
         mmu_type = SYSREG_BFEXT(MMUT, config0);
 
+        device_id = ocd_read(DID);
+
         boot_cpu_data.arch_type = arch_id;
         boot_cpu_data.cpu_type = cpu_id;
         boot_cpu_data.arch_revision = arch_rev;
         boot_cpu_data.cpu_revision = cpu_rev;
         boot_cpu_data.tlb_config = mmu_type;
+        boot_cpu_data.device_id = device_id;
 
         tmp = SYSREG_BFEXT(ILSZ, config1);
         if (tmp) {
@@ -247,41 +282,34 @@ void __init setup_processor(void)
                 return;
         }
 
-        printk ("CPU: %s [%02x] revision %d (%s revision %d)\n",
+        printk ("CPU: %s chip revision %c\n", get_chip_name(&boot_cpu_data),
+                        avr32_get_chip_revision(&boot_cpu_data) + 'A');
+        printk ("CPU: %s [%02x] core revision %d (%s arch revision %d)\n",
                 cpu_names[cpu_id], cpu_id, cpu_rev,
                 arch_names[arch_id], arch_rev);
         printk ("CPU: MMU configuration: %s\n", mmu_types[mmu_type]);
 
         printk ("CPU: features:");
         features = 0;
-        if (config0 & SYSREG_BIT(CONFIG0_R)) {
+        if (config0 & SYSREG_BIT(CONFIG0_R))
                 features |= AVR32_FEATURE_RMW;
-                printk(" rmw");
-        }
-        if (config0 & SYSREG_BIT(CONFIG0_D)) {
+        if (config0 & SYSREG_BIT(CONFIG0_D))
                 features |= AVR32_FEATURE_DSP;
-                printk(" dsp");
-        }
-        if (config0 & SYSREG_BIT(CONFIG0_S)) {
+        if (config0 & SYSREG_BIT(CONFIG0_S))
                 features |= AVR32_FEATURE_SIMD;
-                printk(" simd");
-        }
-        if (config0 & SYSREG_BIT(CONFIG0_O)) {
+        if (config0 & SYSREG_BIT(CONFIG0_O))
                 features |= AVR32_FEATURE_OCD;
-                printk(" ocd");
-        }
-        if (config0 & SYSREG_BIT(CONFIG0_P)) {
+        if (config0 & SYSREG_BIT(CONFIG0_P))
                 features |= AVR32_FEATURE_PCTR;
-                printk(" perfctr");
-        }
-        if (config0 & SYSREG_BIT(CONFIG0_J)) {
+        if (config0 & SYSREG_BIT(CONFIG0_J))
                 features |= AVR32_FEATURE_JAVA;
-                printk(" java");
-        }
-        if (config0 & SYSREG_BIT(CONFIG0_F)) {
+        if (config0 & SYSREG_BIT(CONFIG0_F))
                 features |= AVR32_FEATURE_FPU;
-                printk(" fpu");
-        }
+
+        for (i = 0; i < ARRAY_SIZE(cpu_feature_flags); i++)
+                if (features & (1 << i))
+                        printk(" %s", cpu_feature_flags[i]);
+
         printk("\n");
         boot_cpu_data.features = features;
 }
@@ -291,6 +319,8 @@ static int c_show(struct seq_file *m, void *v)
 {
         unsigned int icache_size, dcache_size;
         unsigned int cpu = smp_processor_id();
+        unsigned int freq;
+        unsigned int i;
 
         icache_size = boot_cpu_data.icache.ways *
                 boot_cpu_data.icache.sets *
@@ -301,15 +331,21 @@ static int c_show(struct seq_file *m, void *v)
 
         seq_printf(m, "processor\t: %d\n", cpu);
 
+        seq_printf(m, "chip type\t: %s revision %c\n",
+                        get_chip_name(&boot_cpu_data),
+                        avr32_get_chip_revision(&boot_cpu_data) + 'A');
         if (boot_cpu_data.arch_type < NR_ARCH_NAMES)
-                seq_printf(m, "cpu family\t: %s revision %d\n",
+                seq_printf(m, "cpu arch\t: %s revision %d\n",
                            arch_names[boot_cpu_data.arch_type],
                            boot_cpu_data.arch_revision);
         if (boot_cpu_data.cpu_type < NR_CPU_NAMES)
-                seq_printf(m, "cpu type\t: %s revision %d\n",
+                seq_printf(m, "cpu core\t: %s revision %d\n",
                            cpu_names[boot_cpu_data.cpu_type],
                            boot_cpu_data.cpu_revision);
 
+        freq = (clk_get_rate(boot_cpu_data.clk) + 500) / 1000;
+        seq_printf(m, "cpu MHz\t\t: %u.%03u\n", freq / 1000, freq % 1000);
+
         seq_printf(m, "i-cache\t\t: %dK (%u ways x %u sets x %u)\n",
                    icache_size >> 10,
                    boot_cpu_data.icache.ways,
@@ -320,7 +356,13 @@ static int c_show(struct seq_file *m, void *v)
                    boot_cpu_data.dcache.ways,
                    boot_cpu_data.dcache.sets,
                    boot_cpu_data.dcache.linesz);
-        seq_printf(m, "bogomips\t: %lu.%02lu\n",
+
+        seq_printf(m, "features\t:");
+        for (i = 0; i < ARRAY_SIZE(cpu_feature_flags); i++)
+                if (boot_cpu_data.features & (1 << i))
+                        seq_printf(m, " %s", cpu_feature_flags[i]);
+
+        seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
                    boot_cpu_data.loops_per_jiffy / (500000/HZ),
                    (boot_cpu_data.loops_per_jiffy / (5000/HZ)) % 100);
 
@@ -343,7 +385,7 @@ static void c_stop(struct seq_file *m, void *v)
 
 }
 
-struct seq_operations cpuinfo_op = {
+const struct seq_operations cpuinfo_op = {
         .start  = c_start,
         .next   = c_next,
         .stop   = c_stop,
diff --git a/arch/avr32/kernel/irq.c b/arch/avr32/kernel/irq.c
index 61f2de266f62..a8e767d836aa 100644
--- a/arch/avr32/kernel/irq.c
+++ b/arch/avr32/kernel/irq.c
@@ -25,6 +25,17 @@ void ack_bad_irq(unsigned int irq)
         printk("unexpected IRQ %u\n", irq);
 }
 
+/* May be overridden by platform code */
+int __weak nmi_enable(void)
+{
+        return -ENOSYS;
+}
+
+void __weak nmi_disable(void)
+{
+
+}
+
 #ifdef CONFIG_PROC_FS
 int show_interrupts(struct seq_file *p, void *v)
 {
diff --git a/arch/avr32/kernel/kprobes.c b/arch/avr32/kernel/kprobes.c
index 799ba89b07a8..f820e9f25520 100644
--- a/arch/avr32/kernel/kprobes.c
+++ b/arch/avr32/kernel/kprobes.c
@@ -48,6 +48,7 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 void __kprobes arch_arm_kprobe(struct kprobe *p)
 {
         pr_debug("arming kprobe at %p\n", p->addr);
+        ocd_enable(NULL);
         *p->addr = BREAKPOINT_INSTRUCTION;
         flush_icache_range((unsigned long)p->addr,
                            (unsigned long)p->addr + sizeof(kprobe_opcode_t));
@@ -56,6 +57,7 @@ void __kprobes arch_arm_kprobe(struct kprobe *p)
 void __kprobes arch_disarm_kprobe(struct kprobe *p)
 {
         pr_debug("disarming kprobe at %p\n", p->addr);
+        ocd_disable(NULL);
         *p->addr = p->opcode;
         flush_icache_range((unsigned long)p->addr,
                            (unsigned long)p->addr + sizeof(kprobe_opcode_t));
@@ -260,9 +262,6 @@ int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
 
 int __init arch_init_kprobes(void)
 {
-        printk("KPROBES: Enabling monitor mode (MM|DBE)...\n");
-        ocd_write(DC, (1 << OCD_DC_MM_BIT) | (1 << OCD_DC_DBE_BIT));
-
         /* TODO: Register kretprobe trampoline */
         return 0;
 }
diff --git a/arch/avr32/kernel/nmi_debug.c b/arch/avr32/kernel/nmi_debug.c
new file mode 100644
index 000000000000..3414b8566c29
--- /dev/null
+++ b/arch/avr32/kernel/nmi_debug.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * 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/delay.h>
+#include <linux/kdebug.h>
+#include <linux/notifier.h>
+#include <linux/sched.h>
+
+#include <asm/irq.h>
+
+enum nmi_action {
+        NMI_SHOW_STATE  = 1 << 0,
+        NMI_SHOW_REGS   = 1 << 1,
+        NMI_DIE         = 1 << 2,
+        NMI_DEBOUNCE    = 1 << 3,
+};
+
+static unsigned long nmi_actions;
+
+static int nmi_debug_notify(struct notifier_block *self,
+                unsigned long val, void *data)
+{
+        struct die_args *args = data;
+
+        if (likely(val != DIE_NMI))
+                return NOTIFY_DONE;
+
+        if (nmi_actions & NMI_SHOW_STATE)
+                show_state();
+        if (nmi_actions & NMI_SHOW_REGS)
+                show_regs(args->regs);
+        if (nmi_actions & NMI_DEBOUNCE)
+                mdelay(10);
+        if (nmi_actions & NMI_DIE)
+                return NOTIFY_BAD;
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block nmi_debug_nb = {
+        .notifier_call = nmi_debug_notify,
+};
+
+static int __init nmi_debug_setup(char *str)
+{
+        char *p, *sep;
+
+        register_die_notifier(&nmi_debug_nb);
+        if (nmi_enable()) {
+                printk(KERN_WARNING "Unable to enable NMI.\n");
+                return 0;
+        }
+
+        if (*str != '=')
+                return 0;
+
+        for (p = str + 1; *p; p = sep + 1) {
+                sep = strchr(p, ',');
+                if (sep)
+                        *sep = 0;
+                if (strcmp(p, "state") == 0)
+                        nmi_actions |= NMI_SHOW_STATE;
+                else if (strcmp(p, "regs") == 0)
+                        nmi_actions |= NMI_SHOW_REGS;
+                else if (strcmp(p, "debounce") == 0)
+                        nmi_actions |= NMI_DEBOUNCE;
+                else if (strcmp(p, "die") == 0)
+                        nmi_actions |= NMI_DIE;
+                else
+                        printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
+                                p);
+                if (!sep)
+                        break;
+        }
+
+        return 0;
+}
+__setup("nmi_debug", nmi_debug_setup);
diff --git a/arch/avr32/kernel/ocd.c b/arch/avr32/kernel/ocd.c
new file mode 100644
index 000000000000..c4f023294d75
--- /dev/null
+++ b/arch/avr32/kernel/ocd.c
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * 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/sched.h>
+#include <linux/spinlock.h>
+
+#include <asm/ocd.h>
+
+static long ocd_count;
+static spinlock_t ocd_lock;
+
+/**
+ * ocd_enable - enable on-chip debugging
+ * @child: task to be debugged
+ *
+ * If @child is non-NULL, ocd_enable() first checks if debugging has
+ * already been enabled for @child, and if it has, does nothing.
+ *
+ * If @child is NULL (e.g. when debugging the kernel), or debugging
+ * has not already been enabled for it, ocd_enable() increments the
+ * reference count and enables the debugging hardware.
+ */
+void ocd_enable(struct task_struct *child)
+{
+        u32 dc;
+
+        if (child)
+                pr_debug("ocd_enable: child=%s [%u]\n",
+                                child->comm, child->pid);
+        else
+                pr_debug("ocd_enable (no child)\n");
+
+        if (!child || !test_and_set_tsk_thread_flag(child, TIF_DEBUG)) {
+                spin_lock(&ocd_lock);
+                ocd_count++;
+                dc = ocd_read(DC);
+                dc |= (1 << OCD_DC_MM_BIT) | (1 << OCD_DC_DBE_BIT);
+                ocd_write(DC, dc);
+                spin_unlock(&ocd_lock);
+        }
+}
+
+/**
+ * ocd_disable - disable on-chip debugging
+ * @child: task that was being debugged, but isn't anymore
+ *
+ * If @child is non-NULL, ocd_disable() checks if debugging is enabled
+ * for @child, and if it isn't, does nothing.
+ *
+ * If @child is NULL (e.g. when debugging the kernel), or debugging is
+ * enabled, ocd_disable() decrements the reference count, and if it
+ * reaches zero, disables the debugging hardware.
+ */
+void ocd_disable(struct task_struct *child)
+{
+        u32 dc;
+
+        if (!child)
+                pr_debug("ocd_disable (no child)\n");
+        else if (test_tsk_thread_flag(child, TIF_DEBUG))
+                pr_debug("ocd_disable: child=%s [%u]\n",
+                                child->comm, child->pid);
+
+        if (!child || test_and_clear_tsk_thread_flag(child, TIF_DEBUG)) {
+                spin_lock(&ocd_lock);
+                ocd_count--;
+
+                WARN_ON(ocd_count < 0);
+
+                if (ocd_count <= 0) {
+                        dc = ocd_read(DC);
+                        dc &= ~((1 << OCD_DC_MM_BIT) | (1 << OCD_DC_DBE_BIT));
+                        ocd_write(DC, dc);
+                }
+                spin_unlock(&ocd_lock);
+        }
+}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/module.h>
+
+static struct dentry *ocd_debugfs_root;
+static struct dentry *ocd_debugfs_DC;
+static struct dentry *ocd_debugfs_DS;
+static struct dentry *ocd_debugfs_count;
+
+static u64 ocd_DC_get(void *data)
+{
+        return ocd_read(DC);
+}
+static void ocd_DC_set(void *data, u64 val)
+{
+        ocd_write(DC, val);
+}
+DEFINE_SIMPLE_ATTRIBUTE(fops_DC, ocd_DC_get, ocd_DC_set, "0x%08llx\n");
+
+static u64 ocd_DS_get(void *data)
+{
+        return ocd_read(DS);
+}
+DEFINE_SIMPLE_ATTRIBUTE(fops_DS, ocd_DS_get, NULL, "0x%08llx\n");
+
+static u64 ocd_count_get(void *data)
+{
+        return ocd_count;
+}
+DEFINE_SIMPLE_ATTRIBUTE(fops_count, ocd_count_get, NULL, "%lld\n");
+
+static void ocd_debugfs_init(void)
+{
+        struct dentry *root;
+
+        root = debugfs_create_dir("ocd", NULL);
+        if (IS_ERR(root) || !root)
+                goto err_root;
+        ocd_debugfs_root = root;
+
+        ocd_debugfs_DC = debugfs_create_file("DC", S_IRUSR | S_IWUSR,
+                                root, NULL, &fops_DC);
+        if (!ocd_debugfs_DC)
+                goto err_DC;
+
+        ocd_debugfs_DS = debugfs_create_file("DS", S_IRUSR, root,
+                                NULL, &fops_DS);
+        if (!ocd_debugfs_DS)
+                goto err_DS;
+
+        ocd_debugfs_count = debugfs_create_file("count", S_IRUSR, root,
+                                NULL, &fops_count);
+        if (!ocd_debugfs_count)
+                goto err_count;
+
+        return;
+
+err_count:
+        debugfs_remove(ocd_debugfs_DS);
+err_DS:
+        debugfs_remove(ocd_debugfs_DC);
+err_DC:
+        debugfs_remove(ocd_debugfs_root);
+err_root:
+        printk(KERN_WARNING "OCD: Failed to create debugfs entries\n");
+}
+#else
+static inline void ocd_debugfs_init(void)
+{
+
+}
+#endif
+
+static int __init ocd_init(void)
+{
+        spin_lock_init(&ocd_lock);
+        ocd_debugfs_init();
+        return 0;
+}
+arch_initcall(ocd_init);
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 9d6dac8af7a2..eaaa69bbdc38 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -103,7 +103,7 @@ EXPORT_SYMBOL(kernel_thread);
  */
 void exit_thread(void)
 {
-        /* nothing to do */
+        ocd_disable(current);
 }
 
 void flush_thread(void)
@@ -345,6 +345,9 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
         p->thread.cpu_context.ksp = (unsigned long)childregs;
         p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
 
+        if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
+                ocd_enable(p);
+
         return 0;
 }
 
diff --git a/arch/avr32/kernel/ptrace.c b/arch/avr32/kernel/ptrace.c
index 002369e44093..1fed38fcf594 100644
--- a/arch/avr32/kernel/ptrace.c
+++ b/arch/avr32/kernel/ptrace.c
@@ -58,6 +58,7 @@ void ptrace_disable(struct task_struct *child)
 {
         clear_tsk_thread_flag(child, TIF_SINGLE_STEP);
         clear_tsk_thread_flag(child, TIF_BREAKPOINT);
+        ocd_disable(child);
 }
 
 /*
@@ -144,10 +145,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
         int ret;
 
-        pr_debug("ptrace: Enabling monitor mode...\n");
-        ocd_write(DC, ocd_read(DC) | (1 << OCD_DC_MM_BIT)
-                        | (1 << OCD_DC_DBE_BIT));
-
         switch (request) {
         /* Read the word at location addr in the child process */
         case PTRACE_PEEKTEXT:
diff --git a/arch/avr32/kernel/signal.c b/arch/avr32/kernel/signal.c
index 0ec14854a200..5616a00c10ba 100644
--- a/arch/avr32/kernel/signal.c
+++ b/arch/avr32/kernel/signal.c
@@ -270,19 +270,12 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset, int syscall)
         if (!user_mode(regs))
                 return 0;
 
-        if (try_to_freeze()) {
-                signr = 0;
-                if (!signal_pending(current))
-                        goto no_signal;
-        }
-
         if (test_thread_flag(TIF_RESTORE_SIGMASK))
                 oldset = &current->saved_sigmask;
         else if (!oldset)
                 oldset = &current->blocked;
 
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-no_signal:
         if (syscall) {
                 switch (regs->r12) {
                 case -ERESTART_RESTARTBLOCK:
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index 870c075e6314..cf6f686d9b0b 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -9,6 +9,7 @@
 #include <linux/bug.h>
 #include <linux/init.h>
 #include <linux/kallsyms.h>
+#include <linux/kdebug.h>
 #include <linux/module.h>
 #include <linux/notifier.h>
 #include <linux/sched.h>
@@ -107,9 +108,23 @@ void _exception(long signr, struct pt_regs *regs, int code,
 
 asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
 {
-        printk(KERN_ALERT "Got Non-Maskable Interrupt, dumping regs\n");
-        show_regs_log_lvl(regs, KERN_ALERT);
-        show_stack_log_lvl(current, regs->sp, regs, KERN_ALERT);
+        int ret;
+
+        nmi_enter();
+
+        ret = notify_die(DIE_NMI, "NMI", regs, 0, ecr, SIGINT);
+        switch (ret) {
+        case NOTIFY_OK:
+        case NOTIFY_STOP:
+                return;
+        case NOTIFY_BAD:
+                die("Fatal Non-Maskable Interrupt", regs, SIGINT);
+        default:
+                break;
+        }
+
+        printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
+        nmi_disable();
 }
 
 asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)