nile4.c

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/*
 *  arch/mips/ddb5074/nile4.c -- NEC Vrc-5074 Nile 4 support routines
 *
 *  Copyright (C) 2000 Geert Uytterhoeven <[e-mail]>
 *                     Sony Software Development Center Europe (SDCE), Brussels
 *
 *  $Id$
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <asm/nile4.h>


    /*
     *  Physical Device Address Registers
     *
     *  Note: 32 bit addressing only!
     */

void nile4_set_pdar(u32 pdar, u32 phys, u32 size, int width, int on_memory_bus,
		    int visible)
{
    u32 maskbits;
    u32 widthbits;

    if (pdar > NILE4_BOOTCS || (pdar & 7)) {
	printk("nile4_set_pdar: invalid pdar %d\n", pdar);
	return;
    }
    if (pdar == NILE4_INTCS && size != 0x00200000) {
	printk("nile4_set_pdar: INTCS size must be 2 MB\n");
	return;
    }
    switch (size) {
#if 0	/* We don't support 4 GB yet */
	case 0x100000000:	/* 4 GB */
	    maskbits = 4;
	    break;
#endif
	case 0x80000000:	/* 2 GB */
	    maskbits = 5;
	    break;
	case 0x40000000:	/* 1 GB */
	    maskbits = 6;
	    break;
	case 0x20000000:	/* 512 MB */
	    maskbits = 7;
	    break;
	case 0x10000000:	/* 256 MB */
	    maskbits = 8;
	    break;
	case 0x08000000:	/* 128 MB */
	    maskbits = 9;
	    break;
	case 0x04000000:	/* 64 MB */
	    maskbits = 10;
	    break;
	case 0x02000000:	/* 32 MB */
	    maskbits = 11;
	    break;
	case 0x01000000:	/* 16 MB */
	    maskbits = 12;
	    break;
	case 0x00800000:	/* 8 MB */
	    maskbits = 13;
	    break;
	case 0x00400000:	/* 4 MB */
	    maskbits = 14;
	    break;
	case 0x00200000:	/* 2 MB */
	    maskbits = 15;
	    break;
	case 0:			/* OFF */
	    maskbits = 0;
	    break;
	default:
	    printk("nile4_set_pdar: unsupported size %p\n", (void *)size);
	    return;
    }
    switch (width) {
	case 8:
	    widthbits = 0;
	    break;
	case 16:
	    widthbits = 1;
	    break;
	case 32:
	    widthbits = 2;
	    break;
	case 64:
	    widthbits = 3;
	    break;
	default:
	    printk("nile4_set_pdar: unsupported width %d\n", width);
	    return;
    }
    nile4_out32(pdar, maskbits | (on_memory_bus ? 0x10 : 0) |
    		      (visible ? 0x20 : 0) | (widthbits << 6) |
		      (phys & 0xffe00000));
    nile4_out32(pdar+4, 0);
    /*
     *  When programming a PDAR, the register should be read immediately after
     *  writing it. This ensures that address decoders are properly configured.
     */
    (void)nile4_in32(pdar);
    (void)nile4_in32(pdar+4);
}


    /*
     *  PCI Master Registers
     *
     *  Note: 32 bit addressing only!
     */

void nile4_set_pmr(u32 pmr, u32 type, u32 addr)
{
    if (pmr != NILE4_PCIINIT0 && pmr != NILE4_PCIINIT1) {
	printk("nile4_set_pmr: invalid pmr %d\n", pmr);
	return;
    }
    switch (type) {
	case NILE4_PCICMD_IACK:	/* PCI Interrupt Acknowledge */
	case NILE4_PCICMD_IO:	/* PCI I/O Space */
	case NILE4_PCICMD_MEM:	/* PCI Memory Space */
	case NILE4_PCICMD_CFG:	/* PCI Configuration Space */
	    break;
	default:
	    printk("nile4_set_pmr: invalid type %d\n", type);
	    return;
    }
    nile4_out32(pmr, (type << 1) | 0x10 | (addr & 0xffe00000));
    nile4_out32(pmr+4, 0);
}


    /*
     *  Interrupt Programming
     */

void nile4_map_irq(int nile4_irq, int cpu_irq)
{
    u32 offset, t;

    offset = NILE4_INTCTRL;
    if (nile4_irq >= 8) {
	offset += 4;
	nile4_irq -= 8;
    }
    t = nile4_in32(offset);
    t &= ~(7 << (nile4_irq*4));
    t |= cpu_irq << (nile4_irq*4);
    nile4_out32(offset, t);
}

void nile4_map_irq_all(int cpu_irq)
{
    u32 all, t;
    
    all = cpu_irq;
    all |= all << 4;
    all |= all << 8;
    all |= all << 16;
    t = nile4_in32(NILE4_INTCTRL);
    t &= 0x88888888;
    t |= all;
    nile4_out32(NILE4_INTCTRL, t);
    t = nile4_in32(NILE4_INTCTRL+4);
    t &= 0x88888888;
    t |= all;
    nile4_out32(NILE4_INTCTRL+4, t);
}

void nile4_enable_irq(int nile4_irq)
{
    u32 offset, t;

    offset = NILE4_INTCTRL;
    if (nile4_irq >= 8) {
	offset += 4;
	nile4_irq -= 8;
    }
    t = nile4_in32(offset);
    t |= 8 << (nile4_irq*4);
    nile4_out32(offset, t);
}

void nile4_disable_irq(int nile4_irq)
{
    u32 offset, t;

    offset = NILE4_INTCTRL;
    if (nile4_irq >= 8) {
	offset += 4;
	nile4_irq -= 8;
    }
    t = nile4_in32(offset);
    t &= ~(8 << (nile4_irq*4));
    nile4_out32(offset, t);
}

void nile4_disable_irq_all(void)
{
    nile4_out32(NILE4_INTCTRL, 0);
    nile4_out32(NILE4_INTCTRL+4, 0);
}

u16 nile4_get_irq_stat(int cpu_irq)
{
    return nile4_in16(NILE4_INTSTAT0+cpu_irq*2);
}

void nile4_enable_irq_output(int cpu_irq)
{
    u32 t;

    t = nile4_in32(NILE4_INTSTAT1+4);
    t |= 1 << (16+cpu_irq);
    nile4_out32(NILE4_INTSTAT1, t);
}

void nile4_disable_irq_output(int cpu_irq)
{
    u32 t;

    t = nile4_in32(NILE4_INTSTAT1+4);
    t &= ~(1 << (16+cpu_irq));
    nile4_out32(NILE4_INTSTAT1, t);
}

void nile4_set_pci_irq_polarity(int pci_irq, int high)
{
    u32 t;

    t = nile4_in32(NILE4_INTPPES);
    if (high)
	t &= ~(1 << (pci_irq*2));
    else
	t |= 1 << (pci_irq*2);
    nile4_out32(NILE4_INTPPES, t);
}

void nile4_set_pci_irq_level_or_edge(int pci_irq, int level)
{
    u32 t;

    t = nile4_in32(NILE4_INTPPES);
    if (level)
	t |= 2 << (pci_irq*2);
    else
	t &= ~(2 << (pci_irq*2));
    nile4_out32(NILE4_INTPPES, t);
}

void nile4_clear_irq(int nile4_irq)
{
    nile4_out32(NILE4_INTCLR, 1 << nile4_irq);
}

void nile4_clear_irq_mask(u32 mask)
{
    nile4_out32(NILE4_INTCLR, mask);
}

u8 nile4_i8259_iack(void)
{
    u8 irq;

    /* Set window 0 for interrupt acknowledge */
    nile4_set_pmr(NILE4_PCIINIT0, NILE4_PCICMD_IACK, 0);
    irq = *(volatile u8 *)NILE4_PCI_IACK_BASE;
    /* Set window 0 for PCI I/O space */
    nile4_set_pmr(NILE4_PCIINIT0, NILE4_PCICMD_IO, 0);
    return irq;
}

#if 0
void nile4_dump_irq_status(void)
{
    printk("CPUSTAT = %p:%p\n", (void *)nile4_in32(NILE4_CPUSTAT+4),
    				(void *)nile4_in32(NILE4_CPUSTAT));
    printk("INTCTRL = %p:%p\n", (void *)nile4_in32(NILE4_INTCTRL+4),
    				(void *)nile4_in32(NILE4_INTCTRL));
    printk("INTSTAT0 = %p:%p\n", (void *)nile4_in32(NILE4_INTSTAT0+4),
    				(void *)nile4_in32(NILE4_INTSTAT0));
    printk("INTSTAT1 = %p:%p\n", (void *)nile4_in32(NILE4_INTSTAT1+4),
    				(void *)nile4_in32(NILE4_INTSTAT1));
    printk("INTCLR = %p:%p\n", (void *)nile4_in32(NILE4_INTCLR+4),
    				(void *)nile4_in32(NILE4_INTCLR));
    printk("INTPPES = %p:%p\n", (void *)nile4_in32(NILE4_INTPPES+4),
    				(void *)nile4_in32(NILE4_INTPPES));
}
#endif