Merge master.kernel.org:/home/rmk/linux-2.6-arm

11 files changed, 354 insertions, 18 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3bfef09..ec77721 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -358,7 +358,7 @@ config HOTPLUG_CPU
 
 config LOCAL_TIMERS
 	bool "Use local timer interrupts"
-	depends on SMP && n
+	depends on SMP && REALVIEW_MPCORE
 	default y
 	help
 	  Enable support for local timers on SMP platforms, rather then the
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index c0f6a11..30494aa 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -359,7 +359,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
 	struct thread_info *thread = p->thread_info;
 	struct pt_regs *childregs;
 
-	childregs = ((struct pt_regs *)((unsigned long)thread + THREAD_START_SP)) - 1;
+	childregs = (void *)thread + THREAD_START_SP - sizeof(*regs);
 	*childregs = *regs;
 	childregs->ARM_r0 = 0;
 	childregs->ARM_sp = stack_start;
diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h
index f35d91f..b8c14e9 100644
--- a/arch/arm/lib/bitops.h
+++ b/arch/arm/lib/bitops.h
@@ -34,7 +34,7 @@
 	and	r2, r0, #7
 	mov	r3, #1
 	mov	r3, r3, lsl r2
-	save_and_disable_irqs ip, r2
+	save_and_disable_irqs ip
 	ldrb	r2, [r1, r0, lsr #3]
 	\instr	r2, r2, r3
 	strb	r2, [r1, r0, lsr #3]
@@ -54,7 +54,7 @@
 	add	r1, r1, r0, lsr #3
 	and	r3, r0, #7
 	mov	r0, #1
-	save_and_disable_irqs ip, r2
+	save_and_disable_irqs ip
 	ldrb	r2, [r1]
 	tst	r2, r0, lsl r3
 	\instr	r2, r2, r0, lsl r3
diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile
index 011a85c..36e76ba 100644
--- a/arch/arm/mach-realview/Makefile
+++ b/arch/arm/mach-realview/Makefile
@@ -5,3 +5,5 @@
 obj-y					:= core.o clock.o
 obj-$(CONFIG_MACH_REALVIEW_EB)		+= realview_eb.o
 obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o
+obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o
+obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c
index 4ea60d8..e2c6fa2 100644
--- a/arch/arm/mach-realview/core.c
+++ b/arch/arm/mach-realview/core.c
@@ -550,7 +550,7 @@ static irqreturn_t realview_timer_interrupt(int irq, void *dev_id, struct pt_reg
 
 	timer_tick(regs);
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS)
 	smp_send_timer();
 	update_process_times(user_mode(regs));
 #endif
diff --git a/arch/arm/mach-realview/hotplug.c b/arch/arm/mach-realview/hotplug.c
new file mode 100644
index 0000000..09748cb
--- /dev/null
+++ b/arch/arm/mach-realview/hotplug.c
@@ -0,0 +1,138 @@
+/*
+ *  linux/arch/arm/mach-realview/hotplug.c
+ *
+ *  Copyright (C) 2002 ARM Ltd.
+ *  All Rights Reserved
+ *
+ * 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/errno.h>
+#include <linux/smp.h>
+#include <linux/completion.h>
+
+extern volatile int pen_release;
+
+static DECLARE_COMPLETION(cpu_killed);
+
+static inline void cpu_enter_lowpower(void)
+{
+	unsigned int v;
+
+	asm volatile(	"mcr	p15, 0, %1, c7, c14, 0\n"
+	"	mcr	p15, 0, %1, c7, c5, 0\n"
+	"	mcr	p15, 0, %1, c7, c10, 4\n"
+	/*
+	 * Turn off coherency
+	 */
+	"	mrc	p15, 0, %0, c1, c0, 1\n"
+	"	bic	%0, %0, #0x20\n"
+	"	mcr	p15, 0, %0, c1, c0, 1\n"
+	"	mrc	p15, 0, %0, c1, c0, 0\n"
+	"	bic	%0, %0, #0x04\n"
+	"	mcr	p15, 0, %0, c1, c0, 0\n"
+	  : "=&r" (v)
+	  : "r" (0)
+	  : "cc");
+}
+
+static inline void cpu_leave_lowpower(void)
+{
+	unsigned int v;
+
+	asm volatile(	"mrc	p15, 0, %0, c1, c0, 0\n"
+	"	orr	%0, %0, #0x04\n"
+	"	mcr	p15, 0, %0, c1, c0, 0\n"
+	"	mrc	p15, 0, %0, c1, c0, 1\n"
+	"	orr	%0, %0, #0x20\n"
+	"	mcr	p15, 0, %0, c1, c0, 1\n"
+	  : "=&r" (v)
+	  :
+	  : "cc");
+}
+
+static inline void platform_do_lowpower(unsigned int cpu)
+{
+	/*
+	 * there is no power-control hardware on this platform, so all
+	 * we can do is put the core into WFI; this is safe as the calling
+	 * code will have already disabled interrupts
+	 */
+	for (;;) {
+		/*
+		 * here's the WFI
+		 */
+		asm(".word	0xe320f003\n"
+		    :
+		    :
+		    : "memory", "cc");
+
+		if (pen_release == cpu) {
+			/*
+			 * OK, proper wakeup, we're done
+			 */
+			break;
+		}
+
+		/*
+		 * getting here, means that we have come out of WFI without
+		 * having been woken up - this shouldn't happen
+		 *
+		 * The trouble is, letting people know about this is not really
+		 * possible, since we are currently running incoherently, and
+		 * therefore cannot safely call printk() or anything else
+		 */
+#ifdef DEBUG
+		printk("CPU%u: spurious wakeup call\n", cpu);
+#endif
+	}
+}
+
+int platform_cpu_kill(unsigned int cpu)
+{
+	return wait_for_completion_timeout(&cpu_killed, 5000);
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+void platform_cpu_die(unsigned int cpu)
+{
+#ifdef DEBUG
+	unsigned int this_cpu = hard_smp_processor_id();
+
+	if (cpu != this_cpu) {
+		printk(KERN_CRIT "Eek! platform_cpu_die running on %u, should be %u\n",
+			   this_cpu, cpu);
+		BUG();
+	}
+#endif
+
+	printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);
+	complete(&cpu_killed);
+
+	/*
+	 * we're ready for shutdown now, so do it
+	 */
+	cpu_enter_lowpower();
+	platform_do_lowpower(cpu);
+
+	/*
+	 * bring this CPU back into the world of cache
+	 * coherency, and then restore interrupts
+	 */
+	cpu_leave_lowpower();
+}
+
+int mach_cpu_disable(unsigned int cpu)
+{
+	/*
+	 * we don't allow CPU 0 to be shutdown (it is still too special
+	 * e.g. clock tick interrupts)
+	 */
+	return cpu == 0 ? -EPERM : 0;
+}
diff --git a/arch/arm/mach-realview/localtimer.c b/arch/arm/mach-realview/localtimer.c
new file mode 100644
index 0000000..5e917e3
--- /dev/null
+++ b/arch/arm/mach-realview/localtimer.c
@@ -0,0 +1,130 @@
+/*
+ *  linux/arch/arm/mach-realview/localtimer.c
+ *
+ *  Copyright (C) 2002 ARM Ltd.
+ *  All Rights Reserved
+ *
+ * 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/kernel.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/smp.h>
+
+#include <asm/mach/time.h>
+#include <asm/hardware/arm_twd.h>
+#include <asm/hardware/gic.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "core.h"
+
+#define TWD_BASE(cpu)	(__io_address(REALVIEW_TWD_BASE) + \
+			 ((cpu) * REALVIEW_TWD_SIZE))
+
+static unsigned long mpcore_timer_rate;
+
+/*
+ * local_timer_ack: checks for a local timer interrupt.
+ *
+ * If a local timer interrupt has occured, acknowledge and return 1.
+ * Otherwise, return 0.
+ */
+int local_timer_ack(void)
+{
+	void __iomem *base = TWD_BASE(smp_processor_id());
+
+	if (__raw_readl(base + TWD_TIMER_INTSTAT)) {
+		__raw_writel(1, base + TWD_TIMER_INTSTAT);
+		return 1;
+	}
+
+	return 0;
+}
+
+void __cpuinit local_timer_setup(unsigned int cpu)
+{
+	void __iomem *base = TWD_BASE(cpu);
+	unsigned int load, offset;
+	u64 waitjiffies;
+	unsigned int count;
+
+	/*
+	 * If this is the first time round, we need to work out how fast
+	 * the timer ticks
+	 */
+	if (mpcore_timer_rate == 0) {
+		printk("Calibrating local timer... ");
+
+		/* Wait for a tick to start */
+		waitjiffies = get_jiffies_64() + 1;
+
+		while (get_jiffies_64() < waitjiffies)
+			udelay(10);
+
+		/* OK, now the tick has started, let's get the timer going */
+		waitjiffies += 5;
+
+				 /* enable, no interrupt or reload */
+		__raw_writel(0x1, base + TWD_TIMER_CONTROL);
+
+				 /* maximum value */
+		__raw_writel(0xFFFFFFFFU, base + TWD_TIMER_COUNTER);
+
+		while (get_jiffies_64() < waitjiffies)
+			udelay(10);
+
+		count = __raw_readl(base + TWD_TIMER_COUNTER);
+
+		mpcore_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
+
+		printk("%lu.%02luMHz.\n", mpcore_timer_rate / 1000000,
+			(mpcore_timer_rate / 100000) % 100);
+	}
+
+	load = mpcore_timer_rate / HZ;
+
+	__raw_writel(load, base + TWD_TIMER_LOAD);
+	__raw_writel(0x7,  base + TWD_TIMER_CONTROL);
+
+	/*
+	 * Now maneuver our local tick into the right part of the jiffy.
+	 * Start by working out where within the tick our local timer
+	 * interrupt should go.
+	 */
+	offset = ((mpcore_timer_rate / HZ) / (NR_CPUS + 1)) * (cpu + 1);
+
+	/*
+	 * gettimeoffset() will return a number of us since the last tick.
+	 * Convert this number of us to a local timer tick count.
+	 * Be careful of integer overflow whilst keeping maximum precision.
+	 *
+	 * with HZ=100 and 1MHz (fpga) ~ 1GHz processor:
+	 * load = 1 ~ 10,000
+	 * mpcore_timer_rate/10000 = 100 ~ 100,000
+	 *
+	 * so the multiply value will be less than 10^9 always.
+	 */
+	load = (system_timer->offset() * (mpcore_timer_rate / 10000)) / 100;
+
+	/* Add on our offset to get the load value */
+	load = (load + offset) % (mpcore_timer_rate / HZ);
+
+	__raw_writel(load, base + TWD_TIMER_COUNTER);
+
+	/* Make sure our local interrupt controller has this enabled */
+	__raw_writel(1 << IRQ_LOCALTIMER,
+		     __io_address(REALVIEW_GIC_DIST_BASE) + GIC_DIST_ENABLE_SET);
+}
+
+/*
+ * take a local timer down
+ */
+void __cpuexit local_timer_stop(unsigned int cpu)
+{
+	__raw_writel(0, TWD_BASE(cpu) + TWD_TIMER_CONTROL);
+}
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index 09b35f6..0c7d4ac 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -175,6 +175,11 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 		max_cpus = ncores;
 
 	/*
+	 * Enable the local timer for primary CPU
+	 */
+	local_timer_setup(cpu);
+
+	/*
 	 * Initialise the possible/present maps.
 	 * cpu_possible_map describes the set of CPUs which may be present
 	 * cpu_present_map describes the set of CPUs populated
diff --git a/arch/arm/mach-s3c2410/mach-anubis.c b/arch/arm/mach-s3c2410/mach-anubis.c
index 8390b68..0f81fc0 100644
--- a/arch/arm/mach-s3c2410/mach-anubis.c
+++ b/arch/arm/mach-s3c2410/mach-anubis.c
@@ -56,8 +56,16 @@
 static struct map_desc anubis_iodesc[] __initdata = {
   /* ISA IO areas */
 
-  { (u32)S3C24XX_VA_ISA_BYTE, 0x0,	   SZ_16M, MT_DEVICE },
-  { (u32)S3C24XX_VA_ISA_WORD, 0x0,	   SZ_16M, MT_DEVICE },
+  {
+	.virtual	= (u32)S3C24XX_VA_ISA_BYTE,
+	.pfn		= __phys_to_pfn(0x0),
+	.length		= SZ_4M,
+	.type		= MT_DEVICE
+  }, {
+	.virtual	= (u32)S3C24XX_VA_ISA_WORD,
+	.pfn		= __phys_to_pfn(0x0),
+	.length 	= SZ_4M, MT_DEVICE
+  },
 
   /* we could possibly compress the next set down into a set of smaller tables
    * pagetables, but that would mean using an L2 section, and it still means
@@ -66,16 +74,41 @@ static struct map_desc anubis_iodesc[] __initdata = {
 
   /* CPLD control registers */
 
-  { (u32)ANUBIS_VA_CTRL1,	ANUBIS_PA_CTRL1,	SZ_4K, MT_DEVICE },
-  { (u32)ANUBIS_VA_CTRL2,	ANUBIS_PA_CTRL2,	SZ_4K, MT_DEVICE },
+  {
+	.virtual	= (u32)ANUBIS_VA_CTRL1,
+	.pfn		= __phys_to_pfn(ANUBIS_PA_CTRL1),
+	.length		= SZ_4K,
+	.type		= MT_DEVICE
+  }, {
+	.virtual	= (u32)ANUBIS_VA_CTRL2,
+	.pfn		= __phys_to_pfn(ANUBIS_PA_CTRL2),
+	.length		= SZ_4K,
+	.type		=MT_DEVICE
+  },
 
   /* IDE drives */
 
-  { (u32)ANUBIS_IDEPRI,		S3C2410_CS3,		SZ_1M, MT_DEVICE },
-  { (u32)ANUBIS_IDEPRIAUX,	S3C2410_CS3+(1<<26),	SZ_1M, MT_DEVICE },
-
-  { (u32)ANUBIS_IDESEC,		S3C2410_CS4,		SZ_1M, MT_DEVICE },
-  { (u32)ANUBIS_IDESECAUX,	S3C2410_CS4+(1<<26),	SZ_1M, MT_DEVICE },
+  {
+	.virtual	= (u32)ANUBIS_IDEPRI,
+	.pfn		= __phys_to_pfn(S3C2410_CS3),
+	.length		= SZ_1M,
+	.type		= MT_DEVICE
+  }, {
+	.virtual	= (u32)ANUBIS_IDEPRIAUX,
+	.pfn		= __phys_to_pfn(S3C2410_CS3+(1<<26)),
+	.length		= SZ_1M,
+	.type		= MT_DEVICE
+  }, {
+	.virtual	= (u32)ANUBIS_IDESEC,
+	.pfn		= __phys_to_pfn(S3C2410_CS4),
+	.length		= SZ_1M,
+	.type		= MT_DEVICE
+  }, {
+	.virtual	= (u32)ANUBIS_IDESECAUX,
+	.pfn		= __phys_to_pfn(S3C2410_CS4+(1<<26)),
+	.length		= SZ_1M,
+	.type		= MT_DEVICE
+  },
 };
 
 #define UCON S3C2410_UCON_DEFAULT | S3C2410_UCON_UCLK
diff --git a/arch/arm/mach-s3c2410/mach-rx3715.c b/arch/arm/mach-s3c2410/mach-rx3715.c
index 24d6901..f8d86d1 100644
--- a/arch/arm/mach-s3c2410/mach-rx3715.c
+++ b/arch/arm/mach-s3c2410/mach-rx3715.c
@@ -56,8 +56,17 @@
 static struct map_desc rx3715_iodesc[] __initdata = {
 	/* dump ISA space somewhere unused */
 
-	{ (u32)S3C24XX_VA_ISA_WORD, S3C2410_CS3, SZ_16M, MT_DEVICE },
-	{ (u32)S3C24XX_VA_ISA_BYTE, S3C2410_CS3, SZ_16M, MT_DEVICE },
+	{
+		.virtual	= (u32)S3C24XX_VA_ISA_WORD,
+		.pfn		= __phys_to_pfn(S3C2410_CS3),
+		.length		= SZ_1M,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (u32)S3C24XX_VA_ISA_BYTE,
+		.pfn		= __phys_to_pfn(S3C2410_CS3),
+		.length		= SZ_1M,
+		.type		= MT_DEVICE,
+	},
 };
 
 
diff --git a/arch/arm/mach-s3c2410/mach-smdk2440.c b/arch/arm/mach-s3c2410/mach-smdk2440.c
index d666c62..4e31118 100644
--- a/arch/arm/mach-s3c2410/mach-smdk2440.c
+++ b/arch/arm/mach-s3c2410/mach-smdk2440.c
@@ -58,8 +58,27 @@
 static struct map_desc smdk2440_iodesc[] __initdata = {
 	/* ISA IO Space map (memory space selected by A24) */
 
-	{ (u32)S3C24XX_VA_ISA_WORD, S3C2410_CS2, SZ_16M, MT_DEVICE },
-	{ (u32)S3C24XX_VA_ISA_BYTE, S3C2410_CS2, SZ_16M, MT_DEVICE },
+	{
+		.virtual	= (u32)S3C24XX_VA_ISA_WORD,
+		.pfn		= __phys_to_pfn(S3C2410_CS2),
+		.length		= 0x10000,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (u32)S3C24XX_VA_ISA_WORD + 0x10000,
+		.pfn		= __phys_to_pfn(S3C2410_CS2 + (1<<24)),
+		.length		= SZ_4M,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (u32)S3C24XX_VA_ISA_BYTE,
+		.pfn		= __phys_to_pfn(S3C2410_CS2),
+		.length		= 0x10000,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (u32)S3C24XX_VA_ISA_BYTE + 0x10000,
+		.pfn		= __phys_to_pfn(S3C2410_CS2 + (1<<24)),
+		.length		= SZ_4M,
+		.type		= MT_DEVICE,
+	}
 };
 
 #define UCON S3C2410_UCON_DEFAULT | S3C2410_UCON_UCLK