Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 245 insertions, 0 deletions

diff --git a/arch/arm/mach-ebsa110/core.c b/arch/arm/mach-ebsa110/core.c
new file mode 100644
index 000000000000..ef362d44949d
--- /dev/null
+++ b/arch/arm/mach-ebsa110/core.c
@@ -0,0 +1,245 @@
+/*
+ *  linux/arch/arm/mach-ebsa110/core.c
+ *
+ *  Copyright (C) 1998-2001 Russell King
+ *
+ * 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.
+ *
+ *  Extra MM routines for the EBSA-110 architecture
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/serial_8250.h>
+#include <linux/init.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/mach-types.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/system.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/map.h>
+
+#include <asm/mach/time.h>
+
+#define IRQ_MASK		0xfe000000	/* read */
+#define IRQ_MSET		0xfe000000	/* write */
+#define IRQ_STAT		0xff000000	/* read */
+#define IRQ_MCLR		0xff000000	/* write */
+
+static void ebsa110_mask_irq(unsigned int irq)
+{
+	__raw_writeb(1 << irq, IRQ_MCLR);
+}
+
+static void ebsa110_unmask_irq(unsigned int irq)
+{
+	__raw_writeb(1 << irq, IRQ_MSET);
+}
+
+static struct irqchip ebsa110_irq_chip = {
+	.ack	= ebsa110_mask_irq,
+	.mask	= ebsa110_mask_irq,
+	.unmask = ebsa110_unmask_irq,
+};
+ 
+static void __init ebsa110_init_irq(void)
+{
+	unsigned long flags;
+	unsigned int irq;
+
+	local_irq_save(flags);
+	__raw_writeb(0xff, IRQ_MCLR);
+	__raw_writeb(0x55, IRQ_MSET);
+	__raw_writeb(0x00, IRQ_MSET);
+	if (__raw_readb(IRQ_MASK) != 0x55)
+		while (1);
+	__raw_writeb(0xff, IRQ_MCLR);	/* clear all interrupt enables */
+	local_irq_restore(flags);
+
+	for (irq = 0; irq < NR_IRQS; irq++) {
+		set_irq_chip(irq, &ebsa110_irq_chip);
+		set_irq_handler(irq, do_level_IRQ);
+		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+	}
+}
+
+static struct map_desc ebsa110_io_desc[] __initdata = {
+	/*
+	 * sparse external-decode ISAIO space
+	 */
+	{ IRQ_STAT,    TRICK4_PHYS, PGDIR_SIZE,  MT_DEVICE }, /* IRQ_STAT/IRQ_MCLR */
+	{ IRQ_MASK,    TRICK3_PHYS, PGDIR_SIZE,  MT_DEVICE }, /* IRQ_MASK/IRQ_MSET */
+	{ SOFT_BASE,   TRICK1_PHYS, PGDIR_SIZE,  MT_DEVICE }, /* SOFT_BASE */
+	{ PIT_BASE,    TRICK0_PHYS, PGDIR_SIZE,  MT_DEVICE }, /* PIT_BASE */
+
+	/*
+	 * self-decode ISAIO space
+	 */
+	{ ISAIO_BASE,  ISAIO_PHYS,  ISAIO_SIZE,  MT_DEVICE },
+	{ ISAMEM_BASE, ISAMEM_PHYS, ISAMEM_SIZE, MT_DEVICE }
+};
+
+static void __init ebsa110_map_io(void)
+{
+	iotable_init(ebsa110_io_desc, ARRAY_SIZE(ebsa110_io_desc));
+}
+
+
+#define PIT_CTRL		(PIT_BASE + 0x0d)
+#define PIT_T2			(PIT_BASE + 0x09)
+#define PIT_T1			(PIT_BASE + 0x05)
+#define PIT_T0			(PIT_BASE + 0x01)
+
+/*
+ * This is the rate at which your MCLK signal toggles (in Hz)
+ * This was measured on a 10 digit frequency counter sampling
+ * over 1 second.
+ */
+#define MCLK	47894000
+
+/*
+ * This is the rate at which the PIT timers get clocked
+ */
+#define CLKBY7	(MCLK / 7)
+
+/*
+ * This is the counter value.  We tick at 200Hz on this platform.
+ */
+#define COUNT	((CLKBY7 + (HZ / 2)) / HZ)
+
+/*
+ * Get the time offset from the system PIT.  Note that if we have missed an
+ * interrupt, then the PIT counter will roll over (ie, be negative).
+ * This actually works out to be convenient.
+ */
+static unsigned long ebsa110_gettimeoffset(void)
+{
+	unsigned long offset, count;
+
+	__raw_writeb(0x40, PIT_CTRL);
+	count = __raw_readb(PIT_T1);
+	count |= __raw_readb(PIT_T1) << 8;
+
+	/*
+	 * If count > COUNT, make the number negative.
+	 */
+	if (count > COUNT)
+		count |= 0xffff0000;
+
+	offset = COUNT;
+	offset -= count;
+
+	/*
+	 * `offset' is in units of timer counts.  Convert
+	 * offset to units of microseconds.
+	 */
+	offset = offset * (1000000 / HZ) / COUNT;
+
+	return offset;
+}
+
+static irqreturn_t
+ebsa110_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	u32 count;
+
+	write_seqlock(&xtime_lock);
+
+	/* latch and read timer 1 */
+	__raw_writeb(0x40, PIT_CTRL);
+	count = __raw_readb(PIT_T1);
+	count |= __raw_readb(PIT_T1) << 8;
+
+	count += COUNT;
+
+	__raw_writeb(count & 0xff, PIT_T1);
+	__raw_writeb(count >> 8, PIT_T1);
+
+	timer_tick(regs);
+
+	write_sequnlock(&xtime_lock);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction ebsa110_timer_irq = {
+	.name		= "EBSA110 Timer Tick",
+	.flags		= SA_INTERRUPT,
+	.handler	= ebsa110_timer_interrupt
+};
+
+/*
+ * Set up timer interrupt.
+ */
+static void __init ebsa110_timer_init(void)
+{
+	/*
+	 * Timer 1, mode 2, LSB/MSB
+	 */
+	__raw_writeb(0x70, PIT_CTRL);
+	__raw_writeb(COUNT & 0xff, PIT_T1);
+	__raw_writeb(COUNT >> 8, PIT_T1);
+
+	setup_irq(IRQ_EBSA110_TIMER0, &ebsa110_timer_irq);
+}
+
+static struct sys_timer ebsa110_timer = {
+	.init		= ebsa110_timer_init,
+	.offset		= ebsa110_gettimeoffset,
+};
+
+static struct plat_serial8250_port serial_platform_data[] = {
+	{
+		.iobase		= 0x3f8,
+		.irq		= 1,
+		.uartclk	= 1843200,
+		.regshift	= 0,
+		.iotype		= UPIO_PORT,
+		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+	},
+	{
+		.iobase		= 0x2f8,
+		.irq		= 2,
+		.uartclk	= 1843200,
+		.regshift	= 0,
+		.iotype		= UPIO_PORT,
+		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
+	},
+	{ },
+};
+
+static struct platform_device serial_device = {
+	.name			= "serial8250",
+	.id			= 0,
+	.dev			= {
+		.platform_data	= serial_platform_data,
+	},
+};
+
+static int __init ebsa110_init(void)
+{
+	return platform_device_register(&serial_device);
+}
+
+arch_initcall(ebsa110_init);
+
+MACHINE_START(EBSA110, "EBSA110")
+	MAINTAINER("Russell King")
+	BOOT_MEM(0x00000000, 0xe0000000, 0xe0000000)
+	BOOT_PARAMS(0x00000400)
+	DISABLE_PARPORT(0)
+	DISABLE_PARPORT(2)
+	SOFT_REBOOT
+	MAPIO(ebsa110_map_io)
+	INITIRQ(ebsa110_init_irq)
+	.timer		= &ebsa110_timer,
+MACHINE_END