core.c

linux 内核源代码

/*
 *  linux/arch/arm/mach-clps7500/core.c
 *
 *  Copyright (C) 1998 Russell King
 *  Copyright (C) 1999 Nexus Electronics Ltd
 *
 * Extra MM routines for CL7500 architecture
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/serial_8250.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>

#include <asm/hardware.h>
#include <asm/hardware/iomd.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach-types.h>

unsigned int vram_size;

static void cl7500_ack_irq_a(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << irq;
	val = iomd_readb(IOMD_IRQMASKA);
	iomd_writeb(val & ~mask, IOMD_IRQMASKA);
	iomd_writeb(mask, IOMD_IRQCLRA);
}

static void cl7500_mask_irq_a(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << irq;
	val = iomd_readb(IOMD_IRQMASKA);
	iomd_writeb(val & ~mask, IOMD_IRQMASKA);
}

static void cl7500_unmask_irq_a(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << irq;
	val = iomd_readb(IOMD_IRQMASKA);
	iomd_writeb(val | mask, IOMD_IRQMASKA);
}

static struct irq_chip clps7500_a_chip = {
	.ack	= cl7500_ack_irq_a,
	.mask	= cl7500_mask_irq_a,
	.unmask	= cl7500_unmask_irq_a,
};

static void cl7500_mask_irq_b(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_IRQMASKB);
	iomd_writeb(val & ~mask, IOMD_IRQMASKB);
}

static void cl7500_unmask_irq_b(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_IRQMASKB);
	iomd_writeb(val | mask, IOMD_IRQMASKB);
}

static struct irq_chip clps7500_b_chip = {
	.ack	= cl7500_mask_irq_b,
	.mask	= cl7500_mask_irq_b,
	.unmask	= cl7500_unmask_irq_b,
};

static void cl7500_mask_irq_c(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_IRQMASKC);
	iomd_writeb(val & ~mask, IOMD_IRQMASKC);
}

static void cl7500_unmask_irq_c(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_IRQMASKC);
	iomd_writeb(val | mask, IOMD_IRQMASKC);
}

static struct irq_chip clps7500_c_chip = {
	.ack	= cl7500_mask_irq_c,
	.mask	= cl7500_mask_irq_c,
	.unmask	= cl7500_unmask_irq_c,
};

static void cl7500_mask_irq_d(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_IRQMASKD);
	iomd_writeb(val & ~mask, IOMD_IRQMASKD);
}

static void cl7500_unmask_irq_d(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_IRQMASKD);
	iomd_writeb(val | mask, IOMD_IRQMASKD);
}

static struct irq_chip clps7500_d_chip = {
	.ack	= cl7500_mask_irq_d,
	.mask	= cl7500_mask_irq_d,
	.unmask	= cl7500_unmask_irq_d,
};

static void cl7500_mask_irq_dma(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_DMAMASK);
	iomd_writeb(val & ~mask, IOMD_DMAMASK);
}

static void cl7500_unmask_irq_dma(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_DMAMASK);
	iomd_writeb(val | mask, IOMD_DMAMASK);
}

static struct irq_chip clps7500_dma_chip = {
	.ack	= cl7500_mask_irq_dma,
	.mask	= cl7500_mask_irq_dma,
	.unmask	= cl7500_unmask_irq_dma,
};

static void cl7500_mask_irq_fiq(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_FIQMASK);
	iomd_writeb(val & ~mask, IOMD_FIQMASK);
}

static void cl7500_unmask_irq_fiq(unsigned int irq)
{
	unsigned int val, mask;

	mask = 1 << (irq & 7);
	val = iomd_readb(IOMD_FIQMASK);
	iomd_writeb(val | mask, IOMD_FIQMASK);
}

static struct irq_chip clps7500_fiq_chip = {
	.ack	= cl7500_mask_irq_fiq,
	.mask	= cl7500_mask_irq_fiq,
	.unmask	= cl7500_unmask_irq_fiq,
};

static void cl7500_no_action(unsigned int irq)
{
}

static struct irq_chip clps7500_no_chip = {
	.ack	= cl7500_no_action,
	.mask	= cl7500_no_action,
	.unmask	= cl7500_no_action,
};

static struct irqaction irq_isa = {
	.handler = no_action,
	.mask = CPU_MASK_NONE,
	.name = "isa",
};

static void __init clps7500_init_irq(void)
{
	unsigned int irq, flags;

	iomd_writeb(0, IOMD_IRQMASKA);
	iomd_writeb(0, IOMD_IRQMASKB);
	iomd_writeb(0, IOMD_FIQMASK);
	iomd_writeb(0, IOMD_DMAMASK);

	for (irq = 0; irq < NR_IRQS; irq++) {
		flags = IRQF_VALID;

		if (irq <= 6 || (irq >= 9 && irq <= 15) ||
		    (irq >= 48 && irq <= 55))
			flags |= IRQF_PROBE;

		switch (irq) {
		case 0 ... 7:
			set_irq_chip(irq, &clps7500_a_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;

		case 8 ... 15:
			set_irq_chip(irq, &clps7500_b_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;

		case 16 ... 22:
			set_irq_chip(irq, &clps7500_dma_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;

		case 24 ... 31:
			set_irq_chip(irq, &clps7500_c_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;

		case 40 ... 47:
			set_irq_chip(irq, &clps7500_d_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;

		case 48 ... 55:
			set_irq_chip(irq, &clps7500_no_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;

		case 64 ... 72:
			set_irq_chip(irq, &clps7500_fiq_chip);
			set_irq_handler(irq, handle_level_irq);
			set_irq_flags(irq, flags);
			break;
		}
	}

	setup_irq(IRQ_ISA, &irq_isa);
}

static struct map_desc cl7500_io_desc[] __initdata = {
	{ 	/* IO space	*/
		.virtual	= (unsigned long)IO_BASE,
		.pfn		= __phys_to_pfn(IO_START),
		.length		= IO_SIZE,
		.type		= MT_DEVICE
	}, {	/* ISA space	*/
		.virtual	= ISA_BASE,
		.pfn		= __phys_to_pfn(ISA_START),
		.length		= ISA_SIZE,
		.type		= MT_DEVICE
	}, {	/* Flash	*/
		.virtual	= FLASH_BASE,
		.pfn		= __phys_to_pfn(FLASH_START),
		.length		= FLASH_SIZE,
		.type		= MT_DEVICE
	}, {	/* LED		*/
		.virtual	= LED_BASE,
		.pfn		= __phys_to_pfn(LED_START),
		.length		= LED_SIZE,
		.type		= MT_DEVICE
	}
};

static void __init clps7500_map_io(void)
{
	iotable_init(cl7500_io_desc, ARRAY_SIZE(cl7500_io_desc));
}

extern void ioctime_init(void);
extern unsigned long ioc_timer_gettimeoffset(void);

static irqreturn_t
clps7500_timer_interrupt(int irq, void *dev_id)
{
	write_seqlock(&xtime_lock);

	timer_tick();

	/* Why not using do_leds interface?? */
	{
		/* Twinkle the lights. */
		static int count, state = 0xff00;
		if (count-- == 0) {
			state ^= 0x100;
			count = 25;
			*((volatile unsigned int *)LED_ADDRESS) = state;
		}
	}

	write_sequnlock(&xtime_lock);

	return IRQ_HANDLED;
}

static struct irqaction clps7500_timer_irq = {
	.name		= "CLPS7500 Timer Tick",
	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
	.handler	= clps7500_timer_interrupt,
};

/*
 * Set up timer interrupt.
 */
static void __init clps7500_timer_init(void)
{
	ioctime_init();
	setup_irq(IRQ_TIMER, &clps7500_timer_irq);
}

static struct sys_timer clps7500_timer = {
	.init		= clps7500_timer_init,
	.offset		= ioc_timer_gettimeoffset,
};

static struct plat_serial8250_port serial_platform_data[] = {
	{
		.mapbase	= 0x03010fe0,
		.irq		= 10,
		.uartclk	= 1843200,
		.regshift	= 2,
		.iotype		= UPIO_MEM,
		.flags		= UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
	},
	{
		.mapbase	= 0x03010be0,
		.irq		= 0,
		.uartclk	= 1843200,
		.regshift	= 2,
		.iotype		= UPIO_MEM,
		.flags		= UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
	},
	{
		.iobase		= ISASLOT_IO + 0x2e8,
		.irq		= 41,
		.uartclk	= 1843200,
		.regshift	= 0,
		.iotype		= UPIO_PORT,
		.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
	},
	{
		.iobase		= ISASLOT_IO + 0x3e8,
		.irq		= 40,
		.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 void __init clps7500_init(void)
{
	platform_device_register(&serial_device);
}

MACHINE_START(CLPS7500, "CL-PS7500")
	/* Maintainer: Philip Blundell */
	.phys_io	= 0x03000000,
	.io_pg_offst	= ((0xe0000000) >> 18) & 0xfffc,
	.map_io		= clps7500_map_io,
	.init_irq	= clps7500_init_irq,
	.init_machine	= clps7500_init,
	.timer		= &clps7500_timer,
MACHINE_END