297 lines
6.3 KiB
C
297 lines
6.3 KiB
C
/*
|
|
* 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/IRQ_MCLR */
|
|
.virtual = IRQ_STAT,
|
|
.pfn = __phys_to_pfn(TRICK4_PHYS),
|
|
.length = PGDIR_SIZE,
|
|
.type = MT_DEVICE
|
|
}, { /* IRQ_MASK/IRQ_MSET */
|
|
.virtual = IRQ_MASK,
|
|
.pfn = __phys_to_pfn(TRICK3_PHYS),
|
|
.length = PGDIR_SIZE,
|
|
.type = MT_DEVICE
|
|
}, { /* SOFT_BASE */
|
|
.virtual = SOFT_BASE,
|
|
.pfn = __phys_to_pfn(TRICK1_PHYS),
|
|
.length = PGDIR_SIZE,
|
|
.type = MT_DEVICE
|
|
}, { /* PIT_BASE */
|
|
.virtual = PIT_BASE,
|
|
.pfn = __phys_to_pfn(TRICK0_PHYS),
|
|
.length = PGDIR_SIZE,
|
|
.type = MT_DEVICE
|
|
},
|
|
|
|
/*
|
|
* self-decode ISAIO space
|
|
*/
|
|
{
|
|
.virtual = ISAIO_BASE,
|
|
.pfn = __phys_to_pfn(ISAIO_PHYS),
|
|
.length = ISAIO_SIZE,
|
|
.type = MT_DEVICE
|
|
}, {
|
|
.virtual = ISAMEM_BASE,
|
|
.pfn = __phys_to_pfn(ISAMEM_PHYS),
|
|
.length = ISAMEM_SIZE,
|
|
.type = 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 = IRQF_DISABLED | IRQF_TIMER,
|
|
.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 = PLAT8250_DEV_PLATFORM,
|
|
.dev = {
|
|
.platform_data = serial_platform_data,
|
|
},
|
|
};
|
|
|
|
static struct resource am79c961_resources[] = {
|
|
{
|
|
.start = 0x220,
|
|
.end = 0x238,
|
|
.flags = IORESOURCE_IO,
|
|
}, {
|
|
.start = IRQ_EBSA110_ETHERNET,
|
|
.end = IRQ_EBSA110_ETHERNET,
|
|
.flags = IORESOURCE_IRQ,
|
|
},
|
|
};
|
|
|
|
static struct platform_device am79c961_device = {
|
|
.name = "am79c961",
|
|
.id = -1,
|
|
.num_resources = ARRAY_SIZE(am79c961_resources),
|
|
.resource = am79c961_resources,
|
|
};
|
|
|
|
static struct platform_device *ebsa110_devices[] = {
|
|
&serial_device,
|
|
&am79c961_device,
|
|
};
|
|
|
|
static int __init ebsa110_init(void)
|
|
{
|
|
return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));
|
|
}
|
|
|
|
arch_initcall(ebsa110_init);
|
|
|
|
MACHINE_START(EBSA110, "EBSA110")
|
|
/* Maintainer: Russell King */
|
|
.phys_io = 0xe0000000,
|
|
.io_pg_offst = ((0xe0000000) >> 18) & 0xfffc,
|
|
.boot_params = 0x00000400,
|
|
.reserve_lp0 = 1,
|
|
.reserve_lp2 = 1,
|
|
.soft_reboot = 1,
|
|
.map_io = ebsa110_map_io,
|
|
.init_irq = ebsa110_init_irq,
|
|
.timer = &ebsa110_timer,
|
|
MACHINE_END
|