/*
 * Copyright (C) Michel Dänzer <michdaen@iiic.ethz.ch>
 *
 * APUS PCI routines.
 *
 * Currently, only B/CVisionPPC cards (Permedia2) are supported.
 *
 * Thanks to Geert Uytterhoeven for the idea:
 * Read values from given config space(s) for the first devices, -1 otherwise
 *
 */

#include <linux/config.h>
#ifdef CONFIG_AMIGA

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>

#include "apus_pci.h"


/* These definitions are mostly adapted from pm2fb.c */

#undef APUS_PCI_MASTER_DEBUG
#ifdef APUS_PCI_MASTER_DEBUG
#define DPRINTK(a,b...)	printk(KERN_DEBUG "apus_pci: %s: " a, __FUNCTION__ , ## b)
#else
#define DPRINTK(a,b...)
#endif 

/*
 * The _DEFINITIVE_ memory mapping/unmapping functions.
 * This is due to the fact that they're changing soooo often...
 */
#define DEFW()		wmb()
#define DEFR()		rmb()
#define DEFRW()		mb()

#define DEVNO(d)	((d)>>3)
#define FNNO(d)		((d)&7)


extern unsigned long powerup_PCI_present;

static struct pci_controller *apus_hose;


void *pci_io_base(unsigned int bus)
{
	return 0;
}


int
apus_pcibios_read_config(struct pci_bus *bus, int devfn, int offset,
			 int len, u32 *val)
{
	int fnno = FNNO(devfn);
	int devno = DEVNO(devfn);
	volatile unsigned char *cfg_data;

	if (bus->number > 0 || devno != 1) {
		*val = ~0;
		return PCIBIOS_DEVICE_NOT_FOUND;
	}
	/* base address + function offset + offset ^ endianness conversion */
	/* XXX the fnno<<5 bit seems wacky  -- paulus */
	cfg_data = apus_hose->cfg_data + (fnno<<5) + (offset ^ (len - 1));
	switch (len) {
	case 1:
		*val = readb(cfg_data);
		break;
	case 2:
		*val = readw(cfg_data);
		break;
	default:
		*val = readl(cfg_data);
		break;
	}

	DPRINTK("read b: 0x%x, d: 0x%x, f: 0x%x, o: 0x%x, l: %d, v: 0x%x\n",
		bus->number, devfn>>3, devfn&7, offset, len, *val);
	return PCIBIOS_SUCCESSFUL;
}

int
apus_pcibios_write_config(struct pci_bus *bus, int devfn, int offset,
			  int len, u32 *val)
{
	int fnno = FNNO(devfn);
	int devno = DEVNO(devfn);
	volatile unsigned char *cfg_data;

	if (bus->number > 0 || devno != 1) {
		return PCIBIOS_DEVICE_NOT_FOUND;
	}
	/* base address + function offset + offset ^ endianness conversion */
	/* XXX the fnno<<5 bit seems wacky  -- paulus */
	cfg_data = apus_hose->cfg_data + (fnno<<5) + (offset ^ (len - 1));
	switch (len) {
	case 1:
		writeb(val, cfg_data); DEFW();
		break;
	case 2:
		writew(val, cfg_data); DEFW();
		break;
	default:
		writel(val, cfg_data); DEFW();
		break;
	}

	DPRINTK("write b: 0x%x, d: 0x%x, f: 0x%x, o: 0x%x, l: %d, v: 0x%x\n",
		bus->number, devfn>>3, devfn&7, offset, len, val);
	return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops apus_pci_ops = {
	apus_pcibios_read_config,
	apus_pcibios_write_config
};

static struct resource pci_mem = { "B/CVisionPPC PCI mem", CVPPC_FB_APERTURE_ONE, CVPPC_PCI_CONFIG, IORESOURCE_MEM };

void __init
apus_pcibios_fixup(void)
{
/*	struct pci_dev *dev = pci_find_slot(0, 1<<3);
	unsigned int reg, val, offset;*/

	/* FIXME: interrupt? */
	/*dev->interrupt = xxx;*/

        request_resource(&iomem_resource, &pci_mem);
    	printk("%s: PCI mem resource requested\n", __FUNCTION__);
}

static void __init apus_pcibios_fixup_bus(struct pci_bus *bus)
{
        bus->resource[1] = &pci_mem;
}


/* 
 * This is from pm2fb.c again
 * 
 * Check if PCI (B/CVisionPPC) is available, initialize it and set up
 * the pcibios_* pointers
 */


void __init
apus_setup_pci_ptrs(void)
{
	if (!powerup_PCI_present) {
		DPRINTK("no PCI bridge detected\n");
		return;
	}
	DPRINTK("Phase5 B/CVisionPPC PCI bridge detected.\n");

	apus_hose = pcibios_alloc_controller();
	if (!apus_hose) {
		printk("apus_pci: Can't allocate PCI controller structure\n");
		return;
	}

	if (!(apus_hose->cfg_data = ioremap(CVPPC_PCI_CONFIG, 256))) {
		printk("apus_pci: unable to map PCI config region\n");
		return;
	}

	if (!(apus_hose->cfg_addr = ioremap(CSPPC_PCI_BRIDGE, 256))) {
		printk("apus_pci: unable to map PCI bridge\n");
		return;
	}

	writel(CSPPCF_BRIDGE_BIG_ENDIAN, apus_hose->cfg_addr + CSPPC_BRIDGE_ENDIAN);
	DEFW();

	writel(CVPPC_REGS_REGION,  apus_hose->cfg_data+ PCI_BASE_ADDRESS_0);
	DEFW();
	writel(CVPPC_FB_APERTURE_ONE, apus_hose->cfg_data + PCI_BASE_ADDRESS_1);
	DEFW();
	writel(CVPPC_FB_APERTURE_TWO, apus_hose->cfg_data + PCI_BASE_ADDRESS_2);
	DEFW();
	writel(CVPPC_ROM_ADDRESS, apus_hose->cfg_data + PCI_ROM_ADDRESS);
	DEFW();

	writel(0xef000000 | PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
		PCI_COMMAND_MASTER, apus_hose->cfg_data + PCI_COMMAND);
	DEFW();

	apus_hose->first_busno = 0;
	apus_hose->last_busno = 0;
	apus_hose->ops = &apus_pci_ops;
	ppc_md.pcibios_fixup = apus_pcibios_fixup;
	ppc_md.pcibios_fixup_bus = apus_pcibios_fixup_bus;

	return;
}

#endif /* CONFIG_AMIGA */
