Linux-2.6.12-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