[linux-2.6-block.git] / arch / sh / mm / pmb.c

/*
 * arch/sh/mm/pmb.c
 *
 * Privileged Space Mapping Buffer (PMB) Support.
 *
 * Copyright (C) 2005, 2006, 2007 Paul Mundt
 *
 * P1/P2 Section mapping definitions from map32.h, which was:
 *
 *	Copyright 2003 (c) Lineo Solutions,Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/err.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/io.h>

#define NR_PMB_ENTRIES	16

static struct kmem_cache *pmb_cache;
static unsigned long pmb_map;

static struct pmb_entry pmb_init_map[] = {
	/* vpn         ppn         flags (ub/sz/c/wt) */

	/* P1 Section Mappings */
	{ 0x80000000, 0x00000000, PMB_SZ_64M  | PMB_C, },
	{ 0x84000000, 0x04000000, PMB_SZ_64M  | PMB_C, },
	{ 0x88000000, 0x08000000, PMB_SZ_128M | PMB_C, },
	{ 0x90000000, 0x10000000, PMB_SZ_64M  | PMB_C, },
	{ 0x94000000, 0x14000000, PMB_SZ_64M  | PMB_C, },
	{ 0x98000000, 0x18000000, PMB_SZ_64M  | PMB_C, },

	/* P2 Section Mappings */
	{ 0xa0000000, 0x00000000, PMB_UB | PMB_SZ_64M  | PMB_WT, },
	{ 0xa4000000, 0x04000000, PMB_UB | PMB_SZ_64M  | PMB_WT, },
	{ 0xa8000000, 0x08000000, PMB_UB | PMB_SZ_128M | PMB_WT, },
	{ 0xb0000000, 0x10000000, PMB_UB | PMB_SZ_64M  | PMB_WT, },
	{ 0xb4000000, 0x14000000, PMB_UB | PMB_SZ_64M  | PMB_WT, },
	{ 0xb8000000, 0x18000000, PMB_UB | PMB_SZ_64M  | PMB_WT, },
};

static inline unsigned long mk_pmb_entry(unsigned int entry)
{
	return (entry & PMB_E_MASK) << PMB_E_SHIFT;
}

static inline unsigned long mk_pmb_addr(unsigned int entry)
{
	return mk_pmb_entry(entry) | PMB_ADDR;
}

static inline unsigned long mk_pmb_data(unsigned int entry)
{
	return mk_pmb_entry(entry) | PMB_DATA;
}

static DEFINE_SPINLOCK(pmb_list_lock);
static struct pmb_entry *pmb_list;

static inline void pmb_list_add(struct pmb_entry *pmbe)
{
	struct pmb_entry **p, *tmp;

	p = &pmb_list;
	while ((tmp = *p) != NULL)
		p = &tmp->next;

	pmbe->next = tmp;
	*p = pmbe;
}

static inline void pmb_list_del(struct pmb_entry *pmbe)
{
	struct pmb_entry **p, *tmp;

	for (p = &pmb_list; (tmp = *p); p = &tmp->next)
		if (tmp == pmbe) {
			*p = tmp->next;
			return;
		}
}

struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
			    unsigned long flags)
{
	struct pmb_entry *pmbe;

	pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
	if (!pmbe)
		return ERR_PTR(-ENOMEM);

	pmbe->vpn	= vpn;
	pmbe->ppn	= ppn;
	pmbe->flags	= flags;

	spin_lock_irq(&pmb_list_lock);
	pmb_list_add(pmbe);
	spin_unlock_irq(&pmb_list_lock);

	return pmbe;
}

void pmb_free(struct pmb_entry *pmbe)
{
	spin_lock_irq(&pmb_list_lock);
	pmb_list_del(pmbe);
	spin_unlock_irq(&pmb_list_lock);

	kmem_cache_free(pmb_cache, pmbe);
}

/*
 * Must be in P2 for __set_pmb_entry()
 */
int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
		    unsigned long flags, int *entry)
{
	unsigned int pos = *entry;

	if (unlikely(pos == PMB_NO_ENTRY))
		pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);

repeat:
	if (unlikely(pos > NR_PMB_ENTRIES))
		return -ENOSPC;

	if (test_and_set_bit(pos, &pmb_map)) {
		pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
		goto repeat;
	}

	ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos));

#ifdef CONFIG_SH_WRITETHROUGH
	/*
	 * When we are in 32-bit address extended mode, CCR.CB becomes
	 * invalid, so care must be taken to manually adjust cacheable
	 * translations.
	 */
	if (likely(flags & PMB_C))
		flags |= PMB_WT;
#endif

	ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));

	*entry = pos;

	return 0;
}

int set_pmb_entry(struct pmb_entry *pmbe)
{
	int ret;

	jump_to_P2();
	ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
	back_to_P1();

	return ret;
}

void clear_pmb_entry(struct pmb_entry *pmbe)
{
	unsigned int entry = pmbe->entry;
	unsigned long addr;

	/*
	 * Don't allow clearing of wired init entries, P1 or P2 access
	 * without a corresponding mapping in the PMB will lead to reset
	 * by the TLB.
	 */
	if (unlikely(entry < ARRAY_SIZE(pmb_init_map) ||
		     entry >= NR_PMB_ENTRIES))
		return;

	jump_to_P2();

	/* Clear V-bit */
	addr = mk_pmb_addr(entry);
	ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);

	addr = mk_pmb_data(entry);
	ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);

	back_to_P1();

	clear_bit(entry, &pmb_map);
}


static struct {
	unsigned long size;
	int flag;
} pmb_sizes[] = {
	{ .size	= 0x20000000, .flag = PMB_SZ_512M, },
	{ .size = 0x08000000, .flag = PMB_SZ_128M, },
	{ .size = 0x04000000, .flag = PMB_SZ_64M,  },
	{ .size = 0x01000000, .flag = PMB_SZ_16M,  },
};

long pmb_remap(unsigned long vaddr, unsigned long phys,
	       unsigned long size, unsigned long flags)
{
	struct pmb_entry *pmbp;
	unsigned long wanted;
	int pmb_flags, i;

	/* Convert typical pgprot value to the PMB equivalent */
	if (flags & _PAGE_CACHABLE) {
		if (flags & _PAGE_WT)
			pmb_flags = PMB_WT;
		else
			pmb_flags = PMB_C;
	} else
		pmb_flags = PMB_WT | PMB_UB;

	pmbp = NULL;
	wanted = size;

again:
	for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
		struct pmb_entry *pmbe;
		int ret;

		if (size < pmb_sizes[i].size)
			continue;

		pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag);
		if (IS_ERR(pmbe))
			return PTR_ERR(pmbe);

		ret = set_pmb_entry(pmbe);
		if (ret != 0) {
			pmb_free(pmbe);
			return -EBUSY;
		}

		phys	+= pmb_sizes[i].size;
		vaddr	+= pmb_sizes[i].size;
		size	-= pmb_sizes[i].size;

		/*
		 * Link adjacent entries that span multiple PMB entries
		 * for easier tear-down.
		 */
		if (likely(pmbp))
			pmbp->link = pmbe;

		pmbp = pmbe;
	}

	if (size >= 0x1000000)
		goto again;

	return wanted - size;
}

void pmb_unmap(unsigned long addr)
{
	struct pmb_entry **p, *pmbe;

	for (p = &pmb_list; (pmbe = *p); p = &pmbe->next)
		if (pmbe->vpn == addr)
			break;

	if (unlikely(!pmbe))
		return;

	WARN_ON(!test_bit(pmbe->entry, &pmb_map));

	do {
		struct pmb_entry *pmblink = pmbe;

		clear_pmb_entry(pmbe);
		pmbe = pmblink->link;

		pmb_free(pmblink);
	} while (pmbe);
}

static void pmb_cache_ctor(void *pmb, struct kmem_cache *cachep,
			   unsigned long flags)
{
	struct pmb_entry *pmbe = pmb;

	memset(pmb, 0, sizeof(struct pmb_entry));

	pmbe->entry = PMB_NO_ENTRY;
}

static int __init pmb_init(void)
{
	unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
	unsigned int entry;

	BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));

	pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0,
				      SLAB_PANIC, pmb_cache_ctor);

	jump_to_P2();

	/*
	 * Ordering is important, P2 must be mapped in the PMB before we
	 * can set PMB.SE, and P1 must be mapped before we jump back to
	 * P1 space.
	 */
	for (entry = 0; entry < nr_entries; entry++) {
		struct pmb_entry *pmbe = pmb_init_map + entry;

		__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
	}

	ctrl_outl(0, PMB_IRMCR);

	/* PMB.SE and UB[7] */
	ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR);

	back_to_P1();

	return 0;
}
arch_initcall(pmb_init);

static int pmb_seq_show(struct seq_file *file, void *iter)
{
	int i;

	seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
			 "CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
	seq_printf(file, "ety   vpn  ppn  size   flags\n");

	for (i = 0; i < NR_PMB_ENTRIES; i++) {
		unsigned long addr, data;
		unsigned int size;
		char *sz_str = NULL;

		addr = ctrl_inl(mk_pmb_addr(i));
		data = ctrl_inl(mk_pmb_data(i));

		size = data & PMB_SZ_MASK;
		sz_str = (size == PMB_SZ_16M)  ? " 16MB":
			 (size == PMB_SZ_64M)  ? " 64MB":
			 (size == PMB_SZ_128M) ? "128MB":
					         "512MB";

		/* 02: V 0x88 0x08 128MB C CB  B */
		seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
			   i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
			   (addr >> 24) & 0xff, (data >> 24) & 0xff,
			   sz_str, (data & PMB_C) ? 'C' : ' ',
			   (data & PMB_WT) ? "WT" : "CB",
			   (data & PMB_UB) ? "UB" : " B");
	}

	return 0;
}

static int pmb_debugfs_open(struct inode *inode, struct file *file)
{
	return single_open(file, pmb_seq_show, NULL);
}

static const struct file_operations pmb_debugfs_fops = {
	.owner		= THIS_MODULE,
	.open		= pmb_debugfs_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init pmb_debugfs_init(void)
{
	struct dentry *dentry;

	dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
				     NULL, NULL, &pmb_debugfs_fops);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);

	return 0;
}
postcore_initcall(pmb_debugfs_init);
Commit	Line	Data
0c7b1df6 PM	1	/*
	2	* arch/sh/mm/pmb.c
	3	*
	4	* Privileged Space Mapping Buffer (PMB) Support.
	5	*
38c425f6	6	* Copyright (C) 2005, 2006, 2007 Paul Mundt
0c7b1df6 PM	7	*
	8	* P1/P2 Section mapping definitions from map32.h, which was:
	9	*
	10	* Copyright 2003 (c) Lineo Solutions,Inc.
	11	*
	12	* This file is subject to the terms and conditions of the GNU General Public
	13	* License. See the file "COPYING" in the main directory of this archive
	14	* for more details.
	15	*/
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/slab.h>
	20	#include <linux/bitops.h>
	21	#include <linux/debugfs.h>
	22	#include <linux/fs.h>
	23	#include <linux/seq_file.h>
	24	#include <linux/err.h>
	25	#include <asm/system.h>
	26	#include <asm/uaccess.h>
d7cdc9e8	27	#include <asm/pgtable.h>
0c7b1df6 PM	28	#include <asm/mmu.h>
	29	#include <asm/io.h>
	30
	31	#define NR_PMB_ENTRIES 16
	32
e18b890b	33	static struct kmem_cache *pmb_cache;
0c7b1df6 PM	34	static unsigned long pmb_map;
	35
	36	static struct pmb_entry pmb_init_map[] = {
	37	/* vpn ppn flags (ub/sz/c/wt) */
	38
	39	/* P1 Section Mappings */
	40	{ 0x80000000, 0x00000000, PMB_SZ_64M \| PMB_C, },
	41	{ 0x84000000, 0x04000000, PMB_SZ_64M \| PMB_C, },
	42	{ 0x88000000, 0x08000000, PMB_SZ_128M \| PMB_C, },
	43	{ 0x90000000, 0x10000000, PMB_SZ_64M \| PMB_C, },
	44	{ 0x94000000, 0x14000000, PMB_SZ_64M \| PMB_C, },
	45	{ 0x98000000, 0x18000000, PMB_SZ_64M \| PMB_C, },
	46
	47	/* P2 Section Mappings */
	48	{ 0xa0000000, 0x00000000, PMB_UB \| PMB_SZ_64M \| PMB_WT, },
	49	{ 0xa4000000, 0x04000000, PMB_UB \| PMB_SZ_64M \| PMB_WT, },
	50	{ 0xa8000000, 0x08000000, PMB_UB \| PMB_SZ_128M \| PMB_WT, },
	51	{ 0xb0000000, 0x10000000, PMB_UB \| PMB_SZ_64M \| PMB_WT, },
	52	{ 0xb4000000, 0x14000000, PMB_UB \| PMB_SZ_64M \| PMB_WT, },
	53	{ 0xb8000000, 0x18000000, PMB_UB \| PMB_SZ_64M \| PMB_WT, },
	54	};
	55
	56	static inline unsigned long mk_pmb_entry(unsigned int entry)
	57	{
	58	return (entry & PMB_E_MASK) << PMB_E_SHIFT;
	59	}
	60
	61	static inline unsigned long mk_pmb_addr(unsigned int entry)
	62	{
	63	return mk_pmb_entry(entry) \| PMB_ADDR;
	64	}
	65
	66	static inline unsigned long mk_pmb_data(unsigned int entry)
	67	{
	68	return mk_pmb_entry(entry) \| PMB_DATA;
	69	}
	70
38c425f6 PM	71	static DEFINE_SPINLOCK(pmb_list_lock);
	72	static struct pmb_entry *pmb_list;
	73
	74	static inline void pmb_list_add(struct pmb_entry *pmbe)
	75	{
	76	struct pmb_entry *p, tmp;
	77
	78	p = &pmb_list;
	79	while ((tmp = *p) != NULL)
	80	p = &tmp->next;
	81
	82	pmbe->next = tmp;
	83	*p = pmbe;
	84	}
	85
	86	static inline void pmb_list_del(struct pmb_entry *pmbe)
	87	{
	88	struct pmb_entry *p, tmp;
	89
	90	for (p = &pmb_list; (tmp = *p); p = &tmp->next)
	91	if (tmp == pmbe) {
	92	*p = tmp->next;
	93	return;
	94	}
	95	}
	96
0c7b1df6 PM	97	struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
	98	unsigned long flags)
	99	{
	100	struct pmb_entry *pmbe;
	101
	102	pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
	103	if (!pmbe)
	104	return ERR_PTR(-ENOMEM);
	105
	106	pmbe->vpn = vpn;
	107	pmbe->ppn = ppn;
	108	pmbe->flags = flags;
	109
38c425f6 PM	110	spin_lock_irq(&pmb_list_lock);
	111	pmb_list_add(pmbe);
	112	spin_unlock_irq(&pmb_list_lock);
	113
0c7b1df6 PM	114	return pmbe;
	115	}
	116
	117	void pmb_free(struct pmb_entry *pmbe)
	118	{
38c425f6 PM	119	spin_lock_irq(&pmb_list_lock);
	120	pmb_list_del(pmbe);
	121	spin_unlock_irq(&pmb_list_lock);
	122
0c7b1df6 PM	123	kmem_cache_free(pmb_cache, pmbe);
	124	}
	125
	126	/*
	127	* Must be in P2 for __set_pmb_entry()
	128	*/
	129	int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
	130	unsigned long flags, int *entry)
	131	{
	132	unsigned int pos = *entry;
	133
	134	if (unlikely(pos == PMB_NO_ENTRY))
	135	pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
	136
	137	repeat:
	138	if (unlikely(pos > NR_PMB_ENTRIES))
	139	return -ENOSPC;
	140
	141	if (test_and_set_bit(pos, &pmb_map)) {
	142	pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
	143	goto repeat;
	144	}
	145
	146	ctrl_outl(vpn \| PMB_V, mk_pmb_addr(pos));
	147
	148	#ifdef CONFIG_SH_WRITETHROUGH
	149	/*
	150	* When we are in 32-bit address extended mode, CCR.CB becomes
	151	* invalid, so care must be taken to manually adjust cacheable
	152	* translations.
	153	*/
	154	if (likely(flags & PMB_C))
	155	flags \|= PMB_WT;
	156	#endif
	157
	158	ctrl_outl(ppn \| flags \| PMB_V, mk_pmb_data(pos));
	159
	160	*entry = pos;
	161
	162	return 0;
	163	}
	164
d7cdc9e8	165	int set_pmb_entry(struct pmb_entry *pmbe)
0c7b1df6	166	{
d7cdc9e8 PM	167	int ret;
d7cdc9e8 PM	168
0c7b1df6	169	jump_to_P2();
d7cdc9e8	170	ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
0c7b1df6	171	back_to_P1();
d7cdc9e8 PM	172
d7cdc9e8 PM	173	return ret;
0c7b1df6 PM	174	}
	175
	176	void clear_pmb_entry(struct pmb_entry *pmbe)
	177	{
	178	unsigned int entry = pmbe->entry;
	179	unsigned long addr;
	180
	181	/*
	182	* Don't allow clearing of wired init entries, P1 or P2 access
	183	* without a corresponding mapping in the PMB will lead to reset
	184	* by the TLB.
	185	*/
	186	if (unlikely(entry < ARRAY_SIZE(pmb_init_map) \|\|
	187	entry >= NR_PMB_ENTRIES))
	188	return;
	189
	190	jump_to_P2();
	191
	192	/* Clear V-bit */
	193	addr = mk_pmb_addr(entry);
	194	ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
	195
	196	addr = mk_pmb_data(entry);
	197	ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
	198
	199	back_to_P1();
	200
	201	clear_bit(entry, &pmb_map);
	202	}
	203
d7cdc9e8 PM	204
	205	static struct {
	206	unsigned long size;
	207	int flag;
	208	} pmb_sizes[] = {
	209	{ .size = 0x20000000, .flag = PMB_SZ_512M, },
	210	{ .size = 0x08000000, .flag = PMB_SZ_128M, },
	211	{ .size = 0x04000000, .flag = PMB_SZ_64M, },
	212	{ .size = 0x01000000, .flag = PMB_SZ_16M, },
	213	};
	214
	215	long pmb_remap(unsigned long vaddr, unsigned long phys,
	216	unsigned long size, unsigned long flags)
	217	{
	218	struct pmb_entry *pmbp;
	219	unsigned long wanted;
	220	int pmb_flags, i;
	221
	222	/* Convert typical pgprot value to the PMB equivalent */
	223	if (flags & _PAGE_CACHABLE) {
	224	if (flags & _PAGE_WT)
	225	pmb_flags = PMB_WT;
	226	else
	227	pmb_flags = PMB_C;
	228	} else
	229	pmb_flags = PMB_WT \| PMB_UB;
	230
	231	pmbp = NULL;
	232	wanted = size;
	233
	234	again:
	235	for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
	236	struct pmb_entry *pmbe;
	237	int ret;
	238
	239	if (size < pmb_sizes[i].size)
	240	continue;
	241
	242	pmbe = pmb_alloc(vaddr, phys, pmb_flags \| pmb_sizes[i].flag);
	243	if (IS_ERR(pmbe))
	244	return PTR_ERR(pmbe);
	245
	246	ret = set_pmb_entry(pmbe);
	247	if (ret != 0) {
	248	pmb_free(pmbe);
	249	return -EBUSY;
	250	}
	251
	252	phys += pmb_sizes[i].size;
	253	vaddr += pmb_sizes[i].size;
	254	size -= pmb_sizes[i].size;
	255
	256	/*
	257	* Link adjacent entries that span multiple PMB entries
	258	* for easier tear-down.
	259	*/
	260	if (likely(pmbp))
	261	pmbp->link = pmbe;
	262
	263	pmbp = pmbe;
	264	}
	265
	266	if (size >= 0x1000000)
	267	goto again;
268
269	return wanted - size;
270	}
271
272	void pmb_unmap(unsigned long addr)
273	{
274	struct pmb_entry *p, pmbe;
275
276	for (p = &pmb_list; (pmbe = *p); p = &pmbe->next)
277	if (pmbe->vpn == addr)
278	break;
279
280	if (unlikely(!pmbe))
281	return;
282
283	WARN_ON(!test_bit(pmbe->entry, &pmb_map));
284
285	do {
286	struct pmb_entry *pmblink = pmbe;
287
288	clear_pmb_entry(pmbe);
289	pmbe = pmblink->link;
290
291	pmb_free(pmblink);
292	} while (pmbe);
293	}
294
38c425f6 PM	295	static void pmb_cache_ctor(void pmb, struct kmem_cache cachep,
38c425f6 PM	296	unsigned long flags)
0c7b1df6	297	{
d7cdc9e8 PM	298	struct pmb_entry *pmbe = pmb;
d7cdc9e8 PM	299
0c7b1df6 PM	300	memset(pmb, 0, sizeof(struct pmb_entry));
0c7b1df6 PM	301
d7cdc9e8	302	pmbe->entry = PMB_NO_ENTRY;
0c7b1df6 PM	303	}
	304
	305	static int __init pmb_init(void)
	306	{
	307	unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
	308	unsigned int entry;
	309
	310	BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
	311
0e6b9c98	312	pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0,
20c2df83	313	SLAB_PANIC, pmb_cache_ctor);
0c7b1df6 PM	314
	315	jump_to_P2();
	316
	317	/*
	318	* Ordering is important, P2 must be mapped in the PMB before we
	319	* can set PMB.SE, and P1 must be mapped before we jump back to
	320	* P1 space.
	321	*/
	322	for (entry = 0; entry < nr_entries; entry++) {
	323	struct pmb_entry *pmbe = pmb_init_map + entry;
	324
	325	__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
	326	}
	327
	328	ctrl_outl(0, PMB_IRMCR);
	329
	330	/* PMB.SE and UB[7] */
	331	ctrl_outl((1 << 31) \| (1 << 7), PMB_PASCR);
	332
	333	back_to_P1();
	334
	335	return 0;
	336	}
0c7b1df6 PM	337	arch_initcall(pmb_init);
0c7b1df6 PM	338
0c7b1df6 PM	339	static int pmb_seq_show(struct seq_file file, void iter)
	340	{
	341	int i;
	342
	343	seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
	344	"CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
	345	seq_printf(file, "ety vpn ppn size flags\n");
	346
	347	for (i = 0; i < NR_PMB_ENTRIES; i++) {
	348	unsigned long addr, data;
	349	unsigned int size;
	350	char *sz_str = NULL;
	351
	352	addr = ctrl_inl(mk_pmb_addr(i));
	353	data = ctrl_inl(mk_pmb_data(i));
	354
	355	size = data & PMB_SZ_MASK;
	356	sz_str = (size == PMB_SZ_16M) ? " 16MB":
	357	(size == PMB_SZ_64M) ? " 64MB":
	358	(size == PMB_SZ_128M) ? "128MB":
	359	"512MB";
	360
	361	/* 02: V 0x88 0x08 128MB C CB B */
	362	seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
	363	i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
	364	(addr >> 24) & 0xff, (data >> 24) & 0xff,
	365	sz_str, (data & PMB_C) ? 'C' : ' ',
	366	(data & PMB_WT) ? "WT" : "CB",
	367	(data & PMB_UB) ? "UB" : " B");
	368	}
	369
	370	return 0;
	371	}
	372
	373	static int pmb_debugfs_open(struct inode inode, struct file file)
	374	{
	375	return single_open(file, pmb_seq_show, NULL);
	376	}
	377
5dfe4c96	378	static const struct file_operations pmb_debugfs_fops = {
0c7b1df6 PM	379	.owner = THIS_MODULE,
	380	.open = pmb_debugfs_open,
	381	.read = seq_read,
	382	.llseek = seq_lseek,
	383	.release = seq_release,
	384	};
	385
	386	static int __init pmb_debugfs_init(void)
	387	{
	388	struct dentry *dentry;
	389
	390	dentry = debugfs_create_file("pmb", S_IFREG \| S_IRUGO,
	391	NULL, NULL, &pmb_debugfs_fops);
	392	if (IS_ERR(dentry))
	393	return PTR_ERR(dentry);
	394
	395	return 0;
	396	}
0c7b1df6	397	postcore_initcall(pmb_debugfs_init);