78f6db9952
This patch removes the use of the IRQF_DISABLED flag from miscellaneous code in mach-xxx and plat-xxx This flag is a NOOP since 2.6.35 and it will be removed one day. Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
330 lines
7.2 KiB
C
330 lines
7.2 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 <linux/io.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/mach-types.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
#include <asm/system_misc.h>
|
|
|
|
#include <asm/mach/arch.h>
|
|
#include <asm/mach/irq.h>
|
|
#include <asm/mach/map.h>
|
|
|
|
#include <asm/mach/time.h>
|
|
|
|
#include "core.h"
|
|
|
|
static void ebsa110_mask_irq(struct irq_data *d)
|
|
{
|
|
__raw_writeb(1 << d->irq, IRQ_MCLR);
|
|
}
|
|
|
|
static void ebsa110_unmask_irq(struct irq_data *d)
|
|
{
|
|
__raw_writeb(1 << d->irq, IRQ_MSET);
|
|
}
|
|
|
|
static struct irq_chip ebsa110_irq_chip = {
|
|
.irq_ack = ebsa110_mask_irq,
|
|
.irq_mask = ebsa110_mask_irq,
|
|
.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++) {
|
|
irq_set_chip_and_handler(irq, &ebsa110_irq_chip,
|
|
handle_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 = (unsigned long)IRQ_STAT,
|
|
.pfn = __phys_to_pfn(TRICK4_PHYS),
|
|
.length = TRICK4_SIZE,
|
|
.type = MT_DEVICE
|
|
}, { /* IRQ_MASK/IRQ_MSET */
|
|
.virtual = (unsigned long)IRQ_MASK,
|
|
.pfn = __phys_to_pfn(TRICK3_PHYS),
|
|
.length = TRICK3_SIZE,
|
|
.type = MT_DEVICE
|
|
}, { /* SOFT_BASE */
|
|
.virtual = (unsigned long)SOFT_BASE,
|
|
.pfn = __phys_to_pfn(TRICK1_PHYS),
|
|
.length = TRICK1_SIZE,
|
|
.type = MT_DEVICE
|
|
}, { /* PIT_BASE */
|
|
.virtual = (unsigned long)PIT_BASE,
|
|
.pfn = __phys_to_pfn(TRICK0_PHYS),
|
|
.length = TRICK0_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));
|
|
}
|
|
|
|
static void __iomem *ebsa110_ioremap_caller(phys_addr_t cookie, size_t size,
|
|
unsigned int flags, void *caller)
|
|
{
|
|
return (void __iomem *)cookie;
|
|
}
|
|
|
|
static void ebsa110_iounmap(volatile void __iomem *io_addr)
|
|
{}
|
|
|
|
static void __init ebsa110_init_early(void)
|
|
{
|
|
arch_ioremap_caller = ebsa110_ioremap_caller;
|
|
arch_iounmap = ebsa110_iounmap;
|
|
}
|
|
|
|
#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 u32 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 * 1000;
|
|
}
|
|
|
|
static irqreturn_t
|
|
ebsa110_timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
u32 count;
|
|
|
|
/* 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();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction ebsa110_timer_irq = {
|
|
.name = "EBSA110 Timer Tick",
|
|
.flags = IRQF_TIMER | IRQF_IRQPOLL,
|
|
.handler = ebsa110_timer_interrupt,
|
|
};
|
|
|
|
/*
|
|
* Set up timer interrupt.
|
|
*/
|
|
void __init ebsa110_timer_init(void)
|
|
{
|
|
arch_gettimeoffset = ebsa110_gettimeoffset;
|
|
|
|
/*
|
|
* 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 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,
|
|
};
|
|
|
|
/*
|
|
* EBSA110 idling methodology:
|
|
*
|
|
* We can not execute the "wait for interrupt" instruction since that
|
|
* will stop our MCLK signal (which provides the clock for the glue
|
|
* logic, and therefore the timer interrupt).
|
|
*
|
|
* Instead, we spin, polling the IRQ_STAT register for the occurrence
|
|
* of any interrupt with core clock down to the memory clock.
|
|
*/
|
|
static void ebsa110_idle(void)
|
|
{
|
|
const char *irq_stat = (char *)0xff000000;
|
|
|
|
/* disable clock switching */
|
|
asm volatile ("mcr p15, 0, ip, c15, c2, 2" : : : "cc");
|
|
|
|
/* wait for an interrupt to occur */
|
|
while (!*irq_stat);
|
|
|
|
/* enable clock switching */
|
|
asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc");
|
|
}
|
|
|
|
static int __init ebsa110_init(void)
|
|
{
|
|
arm_pm_idle = ebsa110_idle;
|
|
return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));
|
|
}
|
|
|
|
arch_initcall(ebsa110_init);
|
|
|
|
static void ebsa110_restart(enum reboot_mode mode, const char *cmd)
|
|
{
|
|
soft_restart(0x80000000);
|
|
}
|
|
|
|
MACHINE_START(EBSA110, "EBSA110")
|
|
/* Maintainer: Russell King */
|
|
.atag_offset = 0x400,
|
|
.reserve_lp0 = 1,
|
|
.reserve_lp2 = 1,
|
|
.map_io = ebsa110_map_io,
|
|
.init_early = ebsa110_init_early,
|
|
.init_irq = ebsa110_init_irq,
|
|
.init_time = ebsa110_timer_init,
|
|
.restart = ebsa110_restart,
|
|
MACHINE_END
|