On Wed, Nov 04, 2009 at 05:05:47PM +0800, Wu Zhangjin wrote:
> diff --git a/arch/mips/loongson/fuloong-2f/irq.c b/arch/mips/loongson/fuloong-2f/irq.c
> new file mode 100644
> index 0000000..22c45fd
> --- /dev/null
> +++ b/arch/mips/loongson/fuloong-2f/irq.c
> @@ -0,0 +1,114 @@
> +/*
> + * Copyright (C) 2007 Lemote Inc.
> + * Author: Fuxin Zhang, zhangfx@xxxxxxxxxx
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +
> +#include <linux/interrupt.h>
> +
> +#include <asm/irq_cpu.h>
> +#include <asm/i8259.h>
> +#include <asm/mipsregs.h>
> +
> +#include <loongson.h>
> +#include <machine.h>
> +
> +#define LOONGSON_TIMER_IRQ (MIPS_CPU_IRQ_BASE + 7) /* cpu timer */
> +#define LOONGSON_PERFCNT_IRQ (MIPS_CPU_IRQ_BASE + 6) /* cpu perf counter */
> +#define LOONGSON_NORTH_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 6) /* bonito */
> +#define LOONGSON_UART_IRQ (MIPS_CPU_IRQ_BASE + 3) /* cpu serial port */
> +#define LOONGSON_SOUTH_BRIDGE_IRQ (MIPS_CPU_IRQ_BASE + 2) /* i8259 */
> +
> +#define LOONGSON_INT_BIT_INT0 (1 << 11)
> +#define LOONGSON_INT_BIT_INT1 (1 << 12)
> +
> +static int mach_i8259_irq(void)
> +{
> + int irq, isr, imr;
> +
> + irq = -1;
> +
> + if ((LOONGSON_INTISR & LOONGSON_INTEN) & LOONGSON_INT_BIT_INT0) {
> + imr = inb(0x21) | (inb(0xa1) << 8);
> + isr = inb(0x20) | (inb(0xa0) << 8);
> + isr &= ~0x4; /* irq2 for cascade */
> + isr &= ~imr;
> + irq = ffs(isr) - 1;
> + }
Any reason why you're not using i8259_irq() from <asm/i8259.h> here?
That function not only gets the locking right, it also minimizes the number
of accesses to the i8259 - which even on modern silicon can be stuningly
slow.
> +#if 1
> + pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &val);
> + printk(KERN_INFO "cs5536 acc latency 0x%x\n", val);
> + pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xc0);
> +#endif
Seems like left over debug code?
> + return;
> +}
And a useless return statement at the end of a void function.
Ralf
