[linux-2.6-block.git] / drivers / char / agp / parisc-agp.c

/*
 * HP Quicksilver AGP GART routines
 *
 * Copyright (c) 2006, Kyle McMartin <kyle@parisc-linux.org>
 *
 * Based on drivers/char/agpgart/hp-agp.c which is
 * (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/klist.h>
#include <linux/agp_backend.h>
#include <linux/log2.h>

#include <asm-parisc/parisc-device.h>
#include <asm-parisc/ropes.h>

#include "agp.h"

#define DRVNAME	"quicksilver"
#define DRVPFX	DRVNAME ": "

#define AGP8X_MODE_BIT		3
#define AGP8X_MODE		(1 << AGP8X_MODE_BIT)

static struct _parisc_agp_info {
	void __iomem *ioc_regs;
	void __iomem *lba_regs;

	int lba_cap_offset;

	u64 *gatt;
	u64 gatt_entries;

	u64 gart_base;
	u64 gart_size;

	int io_page_size;
	int io_pages_per_kpage;
} parisc_agp_info;

static struct gatt_mask parisc_agp_masks[] =
{
        {
		.mask = SBA_PDIR_VALID_BIT,
		.type = 0
	}
};

static struct aper_size_info_fixed parisc_agp_sizes[] =
{
        {0, 0, 0},              /* filled in by parisc_agp_fetch_size() */
};

static int
parisc_agp_fetch_size(void)
{
	int size;

	size = parisc_agp_info.gart_size / MB(1);
	parisc_agp_sizes[0].size = size;
	agp_bridge->current_size = (void *) &parisc_agp_sizes[0];

	return size;
}

static int
parisc_agp_configure(void)
{
	struct _parisc_agp_info *info = &parisc_agp_info;

	agp_bridge->gart_bus_addr = info->gart_base;
	agp_bridge->capndx = info->lba_cap_offset;
	agp_bridge->mode = readl(info->lba_regs+info->lba_cap_offset+PCI_AGP_STATUS);

	return 0;
}

static void
parisc_agp_tlbflush(struct agp_memory *mem)
{
	struct _parisc_agp_info *info = &parisc_agp_info;

	writeq(info->gart_base | ilog2(info->gart_size), info->ioc_regs+IOC_PCOM);
	readq(info->ioc_regs+IOC_PCOM);	/* flush */
}

static int
parisc_agp_create_gatt_table(struct agp_bridge_data *bridge)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
	int i;

	for (i = 0; i < info->gatt_entries; i++) {
		info->gatt[i] = (unsigned long)agp_bridge->scratch_page;
	}

	return 0;
}

static int
parisc_agp_free_gatt_table(struct agp_bridge_data *bridge)
{
	struct _parisc_agp_info *info = &parisc_agp_info;

	info->gatt[0] = SBA_AGPGART_COOKIE;

	return 0;
}

static int
parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
	int i, k;
	off_t j, io_pg_start;
	int io_pg_count;

	if (type != 0 || mem->type != 0) {
		return -EINVAL;
	}

	io_pg_start = info->io_pages_per_kpage * pg_start;
	io_pg_count = info->io_pages_per_kpage * mem->page_count;
	if ((io_pg_start + io_pg_count) > info->gatt_entries) {
		return -EINVAL;
	}

	j = io_pg_start;
	while (j < (io_pg_start + io_pg_count)) {
		if (info->gatt[j])
			return -EBUSY;
		j++;
	}

	if (!mem->is_flushed) {
		global_cache_flush();
		mem->is_flushed = true;
	}

	for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
		unsigned long paddr;

		paddr = mem->memory[i];
		for (k = 0;
		     k < info->io_pages_per_kpage;
		     k++, j++, paddr += info->io_page_size) {
			info->gatt[j] =
				agp_bridge->driver->mask_memory(agp_bridge,
					paddr, type);
		}
	}

	agp_bridge->driver->tlb_flush(mem);

	return 0;
}

static int
parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
	int i, io_pg_start, io_pg_count;

	if (type != 0 || mem->type != 0) {
		return -EINVAL;
	}

	io_pg_start = info->io_pages_per_kpage * pg_start;
	io_pg_count = info->io_pages_per_kpage * mem->page_count;
	for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
		info->gatt[i] = agp_bridge->scratch_page;
	}

	agp_bridge->driver->tlb_flush(mem);
	return 0;
}

static unsigned long
parisc_agp_mask_memory(struct agp_bridge_data *bridge,
		    unsigned long addr, int type)
{
	return SBA_PDIR_VALID_BIT | addr;
}

static void
parisc_agp_enable(struct agp_bridge_data *bridge, u32 mode)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
	u32 command;

	command = readl(info->lba_regs + info->lba_cap_offset + PCI_AGP_STATUS);

	command = agp_collect_device_status(bridge, mode, command);
	command |= 0x00000100;

	writel(command, info->lba_regs + info->lba_cap_offset + PCI_AGP_COMMAND);

	agp_device_command(command, (mode & AGP8X_MODE) != 0);
}

static const struct agp_bridge_driver parisc_agp_driver = {
	.owner			= THIS_MODULE,
	.size_type		= FIXED_APER_SIZE,
	.configure		= parisc_agp_configure,
	.fetch_size		= parisc_agp_fetch_size,
	.tlb_flush		= parisc_agp_tlbflush,
	.mask_memory		= parisc_agp_mask_memory,
	.masks			= parisc_agp_masks,
	.agp_enable		= parisc_agp_enable,
	.cache_flush		= global_cache_flush,
	.create_gatt_table	= parisc_agp_create_gatt_table,
	.free_gatt_table	= parisc_agp_free_gatt_table,
	.insert_memory		= parisc_agp_insert_memory,
	.remove_memory		= parisc_agp_remove_memory,
	.alloc_by_type		= agp_generic_alloc_by_type,
	.free_by_type		= agp_generic_free_by_type,
	.agp_alloc_page		= agp_generic_alloc_page,
	.agp_destroy_page	= agp_generic_destroy_page,
	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
	.cant_use_aperture	= true,
};

static int __init
agp_ioc_init(void __iomem *ioc_regs)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
        u64 iova_base, *io_pdir, io_tlb_ps;
        int io_tlb_shift;

        printk(KERN_INFO DRVPFX "IO PDIR shared with sba_iommu\n");

        info->ioc_regs = ioc_regs;

        io_tlb_ps = readq(info->ioc_regs+IOC_TCNFG);
        switch (io_tlb_ps) {
        case 0: io_tlb_shift = 12; break;
        case 1: io_tlb_shift = 13; break;
        case 2: io_tlb_shift = 14; break;
        case 3: io_tlb_shift = 16; break;
        default:
                printk(KERN_ERR DRVPFX "Invalid IOTLB page size "
                       "configuration 0x%llx\n", io_tlb_ps);
                info->gatt = NULL;
                info->gatt_entries = 0;
                return -ENODEV;
        }
        info->io_page_size = 1 << io_tlb_shift;
        info->io_pages_per_kpage = PAGE_SIZE / info->io_page_size;

        iova_base = readq(info->ioc_regs+IOC_IBASE) & ~0x1;
        info->gart_base = iova_base + PLUTO_IOVA_SIZE - PLUTO_GART_SIZE;

        info->gart_size = PLUTO_GART_SIZE;
        info->gatt_entries = info->gart_size / info->io_page_size;

        io_pdir = phys_to_virt(readq(info->ioc_regs+IOC_PDIR_BASE));
        info->gatt = &io_pdir[(PLUTO_IOVA_SIZE/2) >> PAGE_SHIFT];

        if (info->gatt[0] != SBA_AGPGART_COOKIE) {
                info->gatt = NULL;
                info->gatt_entries = 0;
                printk(KERN_ERR DRVPFX "No reserved IO PDIR entry found; "
                       "GART disabled\n");
                return -ENODEV;
        }

        return 0;
}

static int
lba_find_capability(int cap)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
        u16 status;
        u8 pos, id;
        int ttl = 48;

        status = readw(info->lba_regs + PCI_STATUS);
        if (!(status & PCI_STATUS_CAP_LIST))
                return 0;
        pos = readb(info->lba_regs + PCI_CAPABILITY_LIST);
        while (ttl-- && pos >= 0x40) {
                pos &= ~3;
                id = readb(info->lba_regs + pos + PCI_CAP_LIST_ID);
                if (id == 0xff)
                        break;
                if (id == cap)
                        return pos;
                pos = readb(info->lba_regs + pos + PCI_CAP_LIST_NEXT);
        }
        return 0;
}

static int __init
agp_lba_init(void __iomem *lba_hpa)
{
	struct _parisc_agp_info *info = &parisc_agp_info;
        int cap;

	info->lba_regs = lba_hpa;
        info->lba_cap_offset = lba_find_capability(PCI_CAP_ID_AGP);

        cap = readl(lba_hpa + info->lba_cap_offset) & 0xff;
        if (cap != PCI_CAP_ID_AGP) {
                printk(KERN_ERR DRVPFX "Invalid capability ID 0x%02x at 0x%x\n",
                       cap, info->lba_cap_offset);
                return -ENODEV;
        }

        return 0;
}

static int __init
parisc_agp_setup(void __iomem *ioc_hpa, void __iomem *lba_hpa)
{
	struct pci_dev *fake_bridge_dev = NULL;
	struct agp_bridge_data *bridge;
	int error = 0;

	fake_bridge_dev = alloc_pci_dev();
	if (!fake_bridge_dev) {
		error = -ENOMEM;
		goto fail;
	}

	error = agp_ioc_init(ioc_hpa);
	if (error)
		goto fail;

	error = agp_lba_init(lba_hpa);
	if (error)
		goto fail;

	bridge = agp_alloc_bridge();
	if (!bridge) {
		error = -ENOMEM;
		goto fail;
	}
	bridge->driver = &parisc_agp_driver;

	fake_bridge_dev->vendor = PCI_VENDOR_ID_HP;
	fake_bridge_dev->device = PCI_DEVICE_ID_HP_PCIX_LBA;
	bridge->dev = fake_bridge_dev;

	error = agp_add_bridge(bridge);

fail:
	return error;
}

static struct device *next_device(struct klist_iter *i) {
	struct klist_node * n = klist_next(i);
	return n ? container_of(n, struct device, knode_parent) : NULL;
}

static int
parisc_agp_init(void)
{
	extern struct sba_device *sba_list;

	int err = -1;
	struct parisc_device *sba = NULL, *lba = NULL;
	struct lba_device *lbadev = NULL;
	struct device *dev = NULL;
	struct klist_iter i;

	if (!sba_list)
		goto out;

	/* Find our parent Pluto */
	sba = sba_list->dev;
	if (!IS_PLUTO(sba)) {
		printk(KERN_INFO DRVPFX "No Pluto found, so no AGPGART for you.\n");
		goto out;
	}

	/* Now search our Pluto for our precious AGP device... */
	klist_iter_init(&sba->dev.klist_children, &i);
	while ((dev = next_device(&i))) {
		struct parisc_device *padev = to_parisc_device(dev);
		if (IS_QUICKSILVER(padev))
			lba = padev;
	}
	klist_iter_exit(&i);

	if (!lba) {
		printk(KERN_INFO DRVPFX "No AGP devices found.\n");
		goto out;
	}

	lbadev = parisc_get_drvdata(lba);

	/* w00t, let's go find our cookies... */
	parisc_agp_setup(sba_list->ioc[0].ioc_hpa, lbadev->hba.base_addr);

	return 0;

out:
	return err;
}

module_init(parisc_agp_init);

MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>");
MODULE_LICENSE("GPL");
Commit	Line	Data
08a64368 KM	1	/*
	2	* HP Quicksilver AGP GART routines
	3	*
	4	* Copyright (c) 2006, Kyle McMartin <kyle@parisc-linux.org>
	5	*
	6	* Based on drivers/char/agpgart/hp-agp.c which is
	7	* (c) Copyright 2002, 2003 Hewlett-Packard Development Company, L.P.
	8	* Bjorn Helgaas <bjorn.helgaas@hp.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/pci.h>
	18	#include <linux/init.h>
	19	#include <linux/klist.h>
	20	#include <linux/agp_backend.h>
e57aa839	21	#include <linux/log2.h>
08a64368 KM	22
	23	#include <asm-parisc/parisc-device.h>
	24	#include <asm-parisc/ropes.h>
	25
	26	#include "agp.h"
	27
	28	#define DRVNAME "quicksilver"
	29	#define DRVPFX DRVNAME ": "
	30
08a64368 KM	31	#define AGP8X_MODE_BIT 3
	32	#define AGP8X_MODE (1 << AGP8X_MODE_BIT)
	33
	34	static struct _parisc_agp_info {
	35	void __iomem *ioc_regs;
	36	void __iomem *lba_regs;
	37
	38	int lba_cap_offset;
	39
	40	u64 *gatt;
	41	u64 gatt_entries;
	42
	43	u64 gart_base;
	44	u64 gart_size;
	45
	46	int io_page_size;
	47	int io_pages_per_kpage;
	48	} parisc_agp_info;
	49
	50	static struct gatt_mask parisc_agp_masks[] =
	51	{
	52	{
	53	.mask = SBA_PDIR_VALID_BIT,
	54	.type = 0
	55	}
	56	};
	57
	58	static struct aper_size_info_fixed parisc_agp_sizes[] =
	59	{
	60	{0, 0, 0}, /* filled in by parisc_agp_fetch_size() */
	61	};
	62
	63	static int
	64	parisc_agp_fetch_size(void)
	65	{
	66	int size;
	67
	68	size = parisc_agp_info.gart_size / MB(1);
	69	parisc_agp_sizes[0].size = size;
	70	agp_bridge->current_size = (void *) &parisc_agp_sizes[0];
	71
	72	return size;
	73	}
	74
	75	static int
	76	parisc_agp_configure(void)
	77	{
	78	struct _parisc_agp_info *info = &parisc_agp_info;
	79
	80	agp_bridge->gart_bus_addr = info->gart_base;
	81	agp_bridge->capndx = info->lba_cap_offset;
	82	agp_bridge->mode = readl(info->lba_regs+info->lba_cap_offset+PCI_AGP_STATUS);
	83
	84	return 0;
	85	}
	86
	87	static void
	88	parisc_agp_tlbflush(struct agp_memory *mem)
	89	{
	90	struct _parisc_agp_info *info = &parisc_agp_info;
	91
e57aa839	92	writeq(info->gart_base \| ilog2(info->gart_size), info->ioc_regs+IOC_PCOM);
08a64368 KM	93	readq(info->ioc_regs+IOC_PCOM); /* flush */
	94	}
	95
	96	static int
	97	parisc_agp_create_gatt_table(struct agp_bridge_data *bridge)
	98	{
	99	struct _parisc_agp_info *info = &parisc_agp_info;
	100	int i;
	101
	102	for (i = 0; i < info->gatt_entries; i++) {
	103	info->gatt[i] = (unsigned long)agp_bridge->scratch_page;
	104	}
	105
	106	return 0;
	107	}
	108
	109	static int
	110	parisc_agp_free_gatt_table(struct agp_bridge_data *bridge)
	111	{
	112	struct _parisc_agp_info *info = &parisc_agp_info;
	113
	114	info->gatt[0] = SBA_AGPGART_COOKIE;
	115
	116	return 0;
	117	}
	118
	119	static int
	120	parisc_agp_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
	121	{
	122	struct _parisc_agp_info *info = &parisc_agp_info;
	123	int i, k;
	124	off_t j, io_pg_start;
	125	int io_pg_count;
	126
	127	if (type != 0 \|\| mem->type != 0) {
	128	return -EINVAL;
	129	}
	130
	131	io_pg_start = info->io_pages_per_kpage * pg_start;
	132	io_pg_count = info->io_pages_per_kpage * mem->page_count;
	133	if ((io_pg_start + io_pg_count) > info->gatt_entries) {
	134	return -EINVAL;
	135	}
	136
	137	j = io_pg_start;
	138	while (j < (io_pg_start + io_pg_count)) {
	139	if (info->gatt[j])
	140	return -EBUSY;
	141	j++;
	142	}
	143
c7258012	144	if (!mem->is_flushed) {
08a64368	145	global_cache_flush();
c7258012	146	mem->is_flushed = true;
08a64368 KM	147	}
	148
	149	for (i = 0, j = io_pg_start; i < mem->page_count; i++) {
	150	unsigned long paddr;
	151
	152	paddr = mem->memory[i];
	153	for (k = 0;
	154	k < info->io_pages_per_kpage;
	155	k++, j++, paddr += info->io_page_size) {
	156	info->gatt[j] =
	157	agp_bridge->driver->mask_memory(agp_bridge,
	158	paddr, type);
	159	}
	160	}
	161
	162	agp_bridge->driver->tlb_flush(mem);
	163
	164	return 0;
	165	}
	166
	167	static int
	168	parisc_agp_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
	169	{
	170	struct _parisc_agp_info *info = &parisc_agp_info;
	171	int i, io_pg_start, io_pg_count;
	172
	173	if (type != 0 \|\| mem->type != 0) {
	174	return -EINVAL;
	175	}
	176
	177	io_pg_start = info->io_pages_per_kpage * pg_start;
	178	io_pg_count = info->io_pages_per_kpage * mem->page_count;
	179	for (i = io_pg_start; i < io_pg_count + io_pg_start; i++) {
	180	info->gatt[i] = agp_bridge->scratch_page;
	181	}
	182
	183	agp_bridge->driver->tlb_flush(mem);
	184	return 0;
	185	}
	186
	187	static unsigned long
	188	parisc_agp_mask_memory(struct agp_bridge_data *bridge,
	189	unsigned long addr, int type)
	190	{
	191	return SBA_PDIR_VALID_BIT \| addr;
	192	}
	193
	194	static void
	195	parisc_agp_enable(struct agp_bridge_data *bridge, u32 mode)
	196	{
	197	struct _parisc_agp_info *info = &parisc_agp_info;
	198	u32 command;
	199
	200	command = readl(info->lba_regs + info->lba_cap_offset + PCI_AGP_STATUS);
	201
	202	command = agp_collect_device_status(bridge, mode, command);
	203	command \|= 0x00000100;
	204
	205	writel(command, info->lba_regs + info->lba_cap_offset + PCI_AGP_COMMAND);
	206
	207	agp_device_command(command, (mode & AGP8X_MODE) != 0);
	208	}
	209
fb55a0de	210	static const struct agp_bridge_driver parisc_agp_driver = {
08a64368 KM	211	.owner = THIS_MODULE,
	212	.size_type = FIXED_APER_SIZE,
	213	.configure = parisc_agp_configure,
	214	.fetch_size = parisc_agp_fetch_size,
	215	.tlb_flush = parisc_agp_tlbflush,
	216	.mask_memory = parisc_agp_mask_memory,
	217	.masks = parisc_agp_masks,
	218	.agp_enable = parisc_agp_enable,
	219	.cache_flush = global_cache_flush,
	220	.create_gatt_table = parisc_agp_create_gatt_table,
	221	.free_gatt_table = parisc_agp_free_gatt_table,
	222	.insert_memory = parisc_agp_insert_memory,
	223	.remove_memory = parisc_agp_remove_memory,
	224	.alloc_by_type = agp_generic_alloc_by_type,
	225	.free_by_type = agp_generic_free_by_type,
	226	.agp_alloc_page = agp_generic_alloc_page,
	227	.agp_destroy_page = agp_generic_destroy_page,
bf1e5989	228	.agp_type_to_mask_type = agp_generic_type_to_mask_type,
c7258012	229	.cant_use_aperture = true,
08a64368 KM	230	};
	231
	232	static int __init
	233	agp_ioc_init(void __iomem *ioc_regs)
	234	{
	235	struct _parisc_agp_info *info = &parisc_agp_info;
423c8ece	236	u64 iova_base, *io_pdir, io_tlb_ps;
08a64368 KM	237	int io_tlb_shift;
	238
	239	printk(KERN_INFO DRVPFX "IO PDIR shared with sba_iommu\n");
	240
	241	info->ioc_regs = ioc_regs;
	242
	243	io_tlb_ps = readq(info->ioc_regs+IOC_TCNFG);
	244	switch (io_tlb_ps) {
	245	case 0: io_tlb_shift = 12; break;
	246	case 1: io_tlb_shift = 13; break;
	247	case 2: io_tlb_shift = 14; break;
	248	case 3: io_tlb_shift = 16; break;
	249	default:
	250	printk(KERN_ERR DRVPFX "Invalid IOTLB page size "
	251	"configuration 0x%llx\n", io_tlb_ps);
	252	info->gatt = NULL;
	253	info->gatt_entries = 0;
	254	return -ENODEV;
	255	}
	256	info->io_page_size = 1 << io_tlb_shift;
	257	info->io_pages_per_kpage = PAGE_SIZE / info->io_page_size;
	258
	259	iova_base = readq(info->ioc_regs+IOC_IBASE) & ~0x1;
	260	info->gart_base = iova_base + PLUTO_IOVA_SIZE - PLUTO_GART_SIZE;
	261
	262	info->gart_size = PLUTO_GART_SIZE;
	263	info->gatt_entries = info->gart_size / info->io_page_size;
	264
	265	io_pdir = phys_to_virt(readq(info->ioc_regs+IOC_PDIR_BASE));
	266	info->gatt = &io_pdir[(PLUTO_IOVA_SIZE/2) >> PAGE_SHIFT];
	267
	268	if (info->gatt[0] != SBA_AGPGART_COOKIE) {
	269	info->gatt = NULL;
	270	info->gatt_entries = 0;
	271	printk(KERN_ERR DRVPFX "No reserved IO PDIR entry found; "
	272	"GART disabled\n");
	273	return -ENODEV;
	274	}
	275
	276	return 0;
	277	}
	278
	279	static int
	280	lba_find_capability(int cap)
	281	{
	282	struct _parisc_agp_info *info = &parisc_agp_info;
	283	u16 status;
	284	u8 pos, id;
	285	int ttl = 48;
	286
	287	status = readw(info->lba_regs + PCI_STATUS);
	288	if (!(status & PCI_STATUS_CAP_LIST))
	289	return 0;
	290	pos = readb(info->lba_regs + PCI_CAPABILITY_LIST);
	291	while (ttl-- && pos >= 0x40) {
	292	pos &= ~3;
	293	id = readb(info->lba_regs + pos + PCI_CAP_LIST_ID);
	294	if (id == 0xff)
	295	break;
	296	if (id == cap)
	297	return pos;
	298	pos = readb(info->lba_regs + pos + PCI_CAP_LIST_NEXT);
	299	}
	300	return 0;
301	}
302
303	static int __init
304	agp_lba_init(void __iomem *lba_hpa)
305	{
306	struct _parisc_agp_info *info = &parisc_agp_info;
307	int cap;
308
309	info->lba_regs = lba_hpa;
310	info->lba_cap_offset = lba_find_capability(PCI_CAP_ID_AGP);
311
312	cap = readl(lba_hpa + info->lba_cap_offset) & 0xff;
313	if (cap != PCI_CAP_ID_AGP) {
314	printk(KERN_ERR DRVPFX "Invalid capability ID 0x%02x at 0x%x\n",
315	cap, info->lba_cap_offset);
316	return -ENODEV;
317	}
318
319	return 0;
320	}
321
322	static int __init
323	parisc_agp_setup(void __iomem ioc_hpa, void __iomem lba_hpa)
324	{
325	struct pci_dev *fake_bridge_dev = NULL;
326	struct agp_bridge_data *bridge;
327	int error = 0;
328
bab41e9b	329	fake_bridge_dev = alloc_pci_dev();
08a64368 KM	330	if (!fake_bridge_dev) {
	331	error = -ENOMEM;
	332	goto fail;
	333	}
	334
	335	error = agp_ioc_init(ioc_hpa);
	336	if (error)
	337	goto fail;
	338
	339	error = agp_lba_init(lba_hpa);
	340	if (error)
	341	goto fail;
	342
	343	bridge = agp_alloc_bridge();
	344	if (!bridge) {
	345	error = -ENOMEM;
	346	goto fail;
	347	}
	348	bridge->driver = &parisc_agp_driver;
	349
	350	fake_bridge_dev->vendor = PCI_VENDOR_ID_HP;
	351	fake_bridge_dev->device = PCI_DEVICE_ID_HP_PCIX_LBA;
	352	bridge->dev = fake_bridge_dev;
	353
	354	error = agp_add_bridge(bridge);
	355
	356	fail:
	357	return error;
	358	}
	359
	360	static struct device next_device(struct klist_iter i) {
	361	struct klist_node * n = klist_next(i);
	362	return n ? container_of(n, struct device, knode_parent) : NULL;
	363	}
	364
	365	static int
	366	parisc_agp_init(void)
	367	{
	368	extern struct sba_device *sba_list;
	369
	370	int err = -1;
	371	struct parisc_device sba = NULL, lba = NULL;
	372	struct lba_device *lbadev = NULL;
	373	struct device *dev = NULL;
	374	struct klist_iter i;
	375
	376	if (!sba_list)
	377	goto out;
	378
	379	/* Find our parent Pluto */
	380	sba = sba_list->dev;
	381	if (!IS_PLUTO(sba)) {
	382	printk(KERN_INFO DRVPFX "No Pluto found, so no AGPGART for you.\n");
	383	goto out;
	384	}
	385
	386	/* Now search our Pluto for our precious AGP device... */
	387	klist_iter_init(&sba->dev.klist_children, &i);
	388	while ((dev = next_device(&i))) {
	389	struct parisc_device *padev = to_parisc_device(dev);
	390	if (IS_QUICKSILVER(padev))
	391	lba = padev;
	392	}
	393	klist_iter_exit(&i);
394
395	if (!lba) {
396	printk(KERN_INFO DRVPFX "No AGP devices found.\n");
397	goto out;
398	}
399
400	lbadev = parisc_get_drvdata(lba);
401
402	/* w00t, let's go find our cookies... */
403	parisc_agp_setup(sba_list->ioc[0].ioc_hpa, lbadev->hba.base_addr);
404
405	return 0;
406
407	out:
408	return err;
409	}
410
411	module_init(parisc_agp_init);
412
413	MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>");
414	MODULE_LICENSE("GPL");