Merge tag 'metag-for-v3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag

Pull Metag architecture changes from James Hogan:
 - Infrastructure and DT files for TZ1090 SoC (pin control drivers
   already merged via pinctrl tree).
 - Panic on boot instead of just warning if cache aliasing possible.
 - Various SMP/hotplug fixes.
 - Various other randconfig/sparse fixes.

* tag 'metag-for-v3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag: (24 commits)
  metag: move EXPORT_SYMBOL(csum_partial) to metag_ksyms.c
  metag: cpu hotplug: route_irq: preserve irq mask
  metag: kick: add missing irq_enter/exit to kick_handler()
  metag: smp: don't spin waiting for CPU to start
  metag: smp: enable irqs after set_cpu_online
  metag: use clear_tasks_mm_cpumask()
  metag: tz1090: select and instantiate pinctrl-tz1090-pdc
  metag: tz1090: select and instantiate pinctrl-tz1090
  metag: don't check for cache aliasing on smp cpu boot
  metag: panic if cache aliasing possible
  metag: *.dts: include using preprocessor
  metag: add <dt-bindings/> symlink
  metag/.gitignore: Extend the *.dtb pattern to match the dtb.S files
  metag/traps: include setup.h for the per_cpu_trap_init declaration
  metag/traps: Mark die() as __noreturn to match the declaration.
  metag/processor.h: Add missing cpuinfo_op declaration.
  metag/setup: Restrict scope for the capabilities variable
  metag/mm/cache: Restrict scope for metag_lnkget_probe
  metag/asm/irq.h: Declare init_IRQ
  metag/kernel/irq.c: Declare root_domain as static
  ...

9 files changed, 118 insertions, 45 deletions

diff --git a/arch/metag/kernel/cachepart.c b/arch/metag/kernel/cachepart.c
index 954548b1bea8..0a2385fa2a1d 100644
--- a/arch/metag/kernel/cachepart.c
+++ b/arch/metag/kernel/cachepart.c
@@ -100,22 +100,23 @@ void check_for_cache_aliasing(int thread_id)
 		thread_cache_size =
 				get_thread_cache_size(cache_type, thread_id);
 		if (thread_cache_size < 0)
-			pr_emerg("Can't read %s cache size", \
+			pr_emerg("Can't read %s cache size\n",
 				 cache_type ? "DCACHE" : "ICACHE");
 		else if (thread_cache_size == 0)
 			/* Cache is off. No need to check for aliasing */
 			continue;
 		if (thread_cache_size / CACHE_ASSOCIATIVITY > PAGE_SIZE) {
-			pr_emerg("Cache aliasing detected in %s on Thread %d",
+			pr_emerg("Potential cache aliasing detected in %s on Thread %d\n",
 				 cache_type ? "DCACHE" : "ICACHE", thread_id);
-			pr_warn("Total %s size: %u bytes",
-				cache_type ? "DCACHE" : "ICACHE ",
+			pr_warn("Total %s size: %u bytes\n",
+				cache_type ? "DCACHE" : "ICACHE",
 				cache_type ? get_dcache_size()
 				: get_icache_size());
-			pr_warn("Thread %s size: %d bytes",
+			pr_warn("Thread %s size: %d bytes\n",
 				cache_type ? "CACHE" : "ICACHE",
 				thread_cache_size);
-			pr_warn("Page Size: %lu bytes", PAGE_SIZE);
+			pr_warn("Page Size: %lu bytes\n", PAGE_SIZE);
+			panic("Potential cache aliasing detected");
 		}
 	}
 }
diff --git a/arch/metag/kernel/clock.c b/arch/metag/kernel/clock.c
index defc84056f18..6339c9c6d0ab 100644
--- a/arch/metag/kernel/clock.c
+++ b/arch/metag/kernel/clock.c
@@ -8,8 +8,10 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/io.h>
+#include <linux/of.h>
 
 #include <asm/param.h>
 #include <asm/clock.h>
@@ -34,8 +36,63 @@ static unsigned long get_core_freq_default(void)
 #endif
 }
 
+static struct clk *clk_core;
+
+/* Clk based get_core_freq callback. */
+static unsigned long get_core_freq_clk(void)
+{
+	return clk_get_rate(clk_core);
+}
+
+/**
+ * init_metag_core_clock() - Set up core clock from devicetree.
+ *
+ * Checks to see if a "core" clock is provided in the device tree, and overrides
+ * the get_core_freq callback to use it.
+ */
+static void __init init_metag_core_clock(void)
+{
+	/*
+	 * See if a core clock is provided by the devicetree (and
+	 * registered by the init callback above).
+	 */
+	struct device_node *node;
+	node = of_find_compatible_node(NULL, NULL, "img,meta");
+	if (!node) {
+		pr_warn("%s: no compatible img,meta DT node found\n",
+			__func__);
+		return;
+	}
+
+	clk_core = of_clk_get_by_name(node, "core");
+	if (IS_ERR(clk_core)) {
+		pr_warn("%s: no core clock found in DT\n",
+			__func__);
+		return;
+	}
+
+	/*
+	 * Override the core frequency callback to use
+	 * this clk.
+	 */
+	_meta_clock.get_core_freq = get_core_freq_clk;
+}
+
+/**
+ * init_metag_clocks() - Set up clocks from devicetree.
+ *
+ * Set up important clocks from device tree. In particular any needed for clock
+ * sources.
+ */
+void __init init_metag_clocks(void)
+{
+	init_metag_core_clock();
+
+	pr_info("Core clock frequency: %lu Hz\n", get_coreclock());
+}
+
 /**
- * setup_meta_clocks() - Set up the Meta clock.
+ * setup_meta_clocks() - Early set up of the Meta clock.
  * @desc:	Clock descriptor usually provided by machine description
  *
  * Ensures all callbacks are valid.
diff --git a/arch/metag/kernel/irq.c b/arch/metag/kernel/irq.c
index 87707efeb0a3..2a2c9d55187e 100644
--- a/arch/metag/kernel/irq.c
+++ b/arch/metag/kernel/irq.c
@@ -25,7 +25,7 @@ static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
 static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
 #endif
 
-struct irq_domain *root_domain;
+static struct irq_domain *root_domain;
 
 static unsigned int startup_meta_irq(struct irq_data *data)
 {
@@ -279,11 +279,12 @@ static void route_irq(struct irq_data *data, unsigned int irq, unsigned int cpu)
 {
 	struct irq_desc *desc = irq_to_desc(irq);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
+	unsigned long flags;
 
-	raw_spin_lock_irq(&desc->lock);
+	raw_spin_lock_irqsave(&desc->lock, flags);
 	if (chip->irq_set_affinity)
 		chip->irq_set_affinity(data, cpumask_of(cpu), false);
-	raw_spin_unlock_irq(&desc->lock);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
 }
 
 /*
diff --git a/arch/metag/kernel/kick.c b/arch/metag/kernel/kick.c
index 50fcbec98cd2..beb377621322 100644
--- a/arch/metag/kernel/kick.c
+++ b/arch/metag/kernel/kick.c
@@ -26,6 +26,8 @@
  * pass it as an argument.
  */
 #include <linux/export.h>
+#include <linux/hardirq.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/types.h>
@@ -66,6 +68,7 @@ EXPORT_SYMBOL(kick_unregister_func);
 TBIRES
 kick_handler(TBIRES State, int SigNum, int Triggers, int Inst, PTBI pTBI)
 {
+	struct pt_regs *old_regs;
 	struct kick_irq_handler *kh;
 	struct list_head *lh;
 	int handled = 0;
@@ -79,6 +82,9 @@ kick_handler(TBIRES State, int SigNum, int Triggers, int Inst, PTBI pTBI)
 
 	trace_hardirqs_off();
 
+	old_regs = set_irq_regs((struct pt_regs *)State.Sig.pCtx);
+	irq_enter();
+
 	/*
 	 * There is no need to disable interrupts here because we
 	 * can't nest KICK interrupts in a KICK interrupt handler.
@@ -97,5 +103,8 @@ kick_handler(TBIRES State, int SigNum, int Triggers, int Inst, PTBI pTBI)
 
 	WARN_ON(!handled);
 
+	irq_exit();
+	set_irq_regs(old_regs);
+
 	return tail_end(ret);
 }
diff --git a/arch/metag/kernel/metag_ksyms.c b/arch/metag/kernel/metag_ksyms.c
index ec872ef14eb1..215c94ad63ac 100644
--- a/arch/metag/kernel/metag_ksyms.c
+++ b/arch/metag/kernel/metag_ksyms.c
@@ -1,5 +1,7 @@
 #include <linux/export.h>
+#include <linux/types.h>
 
+#include <asm/checksum.h>
 #include <asm/div64.h>
 #include <asm/ftrace.h>
 #include <asm/page.h>
@@ -15,6 +17,9 @@ EXPORT_SYMBOL(max_pfn);
 EXPORT_SYMBOL(min_low_pfn);
 #endif
 
+/* Network checksum functions */
+EXPORT_SYMBOL(csum_partial);
+
 /* TBI symbols */
 EXPORT_SYMBOL(__TBI);
 EXPORT_SYMBOL(__TBIFindSeg);
diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c
index 4f5726f1a55b..c396cd0b425f 100644
--- a/arch/metag/kernel/setup.c
+++ b/arch/metag/kernel/setup.c
@@ -20,6 +20,7 @@
 #include <linux/memblock.h>
 #include <linux/mm.h>
 #include <linux/of_fdt.h>
+#include <linux/of_platform.h>
 #include <linux/pfn.h>
 #include <linux/root_dev.h>
 #include <linux/sched.h>
@@ -424,6 +425,9 @@ static int __init customize_machine(void)
 	/* customizes platform devices, or adds new ones */
 	if (machine_desc->init_machine)
 		machine_desc->init_machine();
+	else
+		of_platform_populate(NULL, of_default_bus_match_table, NULL,
+				     NULL);
 	return 0;
 }
 arch_initcall(customize_machine);
@@ -587,20 +591,20 @@ PTBI pTBI_get(unsigned int cpu)
 EXPORT_SYMBOL(pTBI_get);
 
 #if defined(CONFIG_METAG_DSP) && defined(CONFIG_METAG_FPU)
-char capabilites[] = "dsp fpu";
+static char capabilities[] = "dsp fpu";
 #elif defined(CONFIG_METAG_DSP)
-char capabilites[] = "dsp";
+static char capabilities[] = "dsp";
 #elif defined(CONFIG_METAG_FPU)
-char capabilites[] = "fpu";
+static char capabilities[] = "fpu";
 #else
-char capabilites[] = "";
+static char capabilities[] = "";
 #endif
 
 static struct ctl_table caps_kern_table[] = {
 	{
 		.procname	= "capabilities",
-		.data		= capabilites,
-		.maxlen		= sizeof(capabilites),
+		.data		= capabilities,
+		.maxlen		= sizeof(capabilities),
 		.mode		= 0444,
 		.proc_handler	= proc_dostring,
 	},
diff --git a/arch/metag/kernel/smp.c b/arch/metag/kernel/smp.c
index f443ec9a7cbe..e413875cf6d2 100644
--- a/arch/metag/kernel/smp.c
+++ b/arch/metag/kernel/smp.c
@@ -8,6 +8,7 @@
  * published by the Free Software Foundation.
  */
 #include <linux/atomic.h>
+#include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
@@ -62,6 +63,8 @@ static DEFINE_PER_CPU(struct ipi_data, ipi_data) = {
 
 static DEFINE_SPINLOCK(boot_lock);
 
+static DECLARE_COMPLETION(cpu_running);
+
 /*
  * "thread" is assumed to be a valid Meta hardware thread ID.
  */
@@ -235,20 +238,12 @@ int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *idle)
 	 */
 	ret = boot_secondary(thread, idle);
 	if (ret == 0) {
-		unsigned long timeout;
-
 		/*
 		 * CPU was successfully started, wait for it
 		 * to come online or time out.
 		 */
-		timeout = jiffies + HZ;
-		while (time_before(jiffies, timeout)) {
-			if (cpu_online(cpu))
-				break;
-
-			udelay(10);
-			barrier();
-		}
+		wait_for_completion_timeout(&cpu_running,
+					    msecs_to_jiffies(1000));
 
 		if (!cpu_online(cpu))
 			ret = -EIO;
@@ -276,7 +271,6 @@ static DECLARE_COMPLETION(cpu_killed);
 int __cpuexit __cpu_disable(void)
 {
 	unsigned int cpu = smp_processor_id();
-	struct task_struct *p;
 
 	/*
 	 * Take this CPU offline.  Once we clear this, we can't return,
@@ -296,12 +290,7 @@ int __cpuexit __cpu_disable(void)
 	flush_cache_all();
 	local_flush_tlb_all();
 
-	read_lock(&tasklist_lock);
-	for_each_process(p) {
-		if (p->mm)
-			cpumask_clear_cpu(cpu, mm_cpumask(p->mm));
-	}
-	read_unlock(&tasklist_lock);
+	clear_tasks_mm_cpumask(cpu);
 
 	return 0;
 }
@@ -385,12 +374,7 @@ asmlinkage void secondary_start_kernel(void)
 
 	setup_priv();
 
-	/*
-	 * Enable local interrupts.
-	 */
-	tbi_startup_interrupt(TBID_SIGNUM_TRT);
 	notify_cpu_starting(cpu);
-	local_irq_enable();
 
 	pr_info("CPU%u (thread %u): Booted secondary processor\n",
 		cpu, cpu_2_hwthread_id[cpu]);
@@ -402,12 +386,13 @@ asmlinkage void secondary_start_kernel(void)
 	 * OK, now it's safe to let the boot CPU continue
 	 */
 	set_cpu_online(cpu, true);
+	complete(&cpu_running);
 
 	/*
-	 * Check for cache aliasing.
-	 * Preemption is disabled
+	 * Enable local interrupts.
 	 */
-	check_for_cache_aliasing(cpu);
+	tbi_startup_interrupt(TBID_SIGNUM_TRT);
+	local_irq_enable();
 
 	/*
 	 * OK, it's off to the idle thread for us
diff --git a/arch/metag/kernel/time.c b/arch/metag/kernel/time.c
index 17dc10733b2f..f1c8c53dace7 100644
--- a/arch/metag/kernel/time.c
+++ b/arch/metag/kernel/time.c
@@ -5,11 +5,21 @@
  *
  */
 
-#include <linux/init.h>
-
 #include <clocksource/metag_generic.h>
+#include <linux/clk-provider.h>
+#include <linux/init.h>
+#include <asm/clock.h>
 
 void __init time_init(void)
 {
+#ifdef CONFIG_COMMON_CLK
+	/* Init clocks from device tree */
+	of_clk_init(NULL);
+#endif
+
+	/* Init meta clocks, particularly the core clock */
+	init_metag_clocks();
+
+	/* Set up the timer clock sources */
 	metag_generic_timer_init();
 }
diff --git a/arch/metag/kernel/traps.c b/arch/metag/kernel/traps.c
index 2ceeaae5b199..c00ade0228ef 100644
--- a/arch/metag/kernel/traps.c
+++ b/arch/metag/kernel/traps.c
@@ -33,6 +33,7 @@
 #include <asm/siginfo.h>
 #include <asm/traps.h>
 #include <asm/hwthread.h>
+#include <asm/setup.h>
 #include <asm/switch.h>
 #include <asm/user_gateway.h>
 #include <asm/syscall.h>
@@ -87,8 +88,8 @@ const char *trap_name(int trapno)
 
 static DEFINE_SPINLOCK(die_lock);
 
-void die(const char *str, struct pt_regs *regs, long err,
-	 unsigned long addr)
+void __noreturn die(const char *str, struct pt_regs *regs,
+		    long err, unsigned long addr)
 {
 	static int die_counter;