[deliverable/linux.git] / arch / sh / mm / pmb.c

/*
 * arch/sh/mm/pmb.c
 *
 * Privileged Space Mapping Buffer (PMB) Support.
 *
 * Copyright (C) 2005, 2006 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;
}

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;

	return pmbe;
}

void pmb_free(struct pmb_entry *pmbe)
{
	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 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;
		}
}

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));

	spin_lock_irq(&pmb_list_lock);

	pmbe->entry = PMB_NO_ENTRY;
	pmb_list_add(pmbe);

	spin_unlock_irq(&pmb_list_lock);
}

static void pmb_cache_dtor(void *pmb, struct kmem_cache *cachep, unsigned long flags)
{
	spin_lock_irq(&pmb_list_lock);
	pmb_list_del(pmb);
	spin_unlock_irq(&pmb_list_lock);
}

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, 0, pmb_cache_ctor, pmb_cache_dtor);
	BUG_ON(!pmb_cache);

	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	*
d7cdc9e8	6	* Copyright (C) 2005, 2006 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
	71	struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
	72	unsigned long flags)
	73	{
	74	struct pmb_entry *pmbe;
	75
	76	pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
	77	if (!pmbe)
	78	return ERR_PTR(-ENOMEM);
	79
	80	pmbe->vpn = vpn;
	81	pmbe->ppn = ppn;
	82	pmbe->flags = flags;
	83
	84	return pmbe;
	85	}
	86
	87	void pmb_free(struct pmb_entry *pmbe)
	88	{
	89	kmem_cache_free(pmb_cache, pmbe);
	90	}
	91
	92	/*
	93	* Must be in P2 for __set_pmb_entry()
	94	*/
	95	int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
	96	unsigned long flags, int *entry)
	97	{
98	unsigned int pos = *entry;
99
100	if (unlikely(pos == PMB_NO_ENTRY))
101	pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
102
103	repeat:
104	if (unlikely(pos > NR_PMB_ENTRIES))
105	return -ENOSPC;
106
107	if (test_and_set_bit(pos, &pmb_map)) {
108	pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
109	goto repeat;
110	}
111
112	ctrl_outl(vpn \| PMB_V, mk_pmb_addr(pos));
113
114	#ifdef CONFIG_SH_WRITETHROUGH
115	/*
116	* When we are in 32-bit address extended mode, CCR.CB becomes
117	* invalid, so care must be taken to manually adjust cacheable
118	* translations.
119	*/
120	if (likely(flags & PMB_C))
121	flags \|= PMB_WT;
122	#endif
123
124	ctrl_outl(ppn \| flags \| PMB_V, mk_pmb_data(pos));
125
126	*entry = pos;
127
128	return 0;
129	}
130
d7cdc9e8	131	int set_pmb_entry(struct pmb_entry *pmbe)
0c7b1df6	132	{
d7cdc9e8 PM	133	int ret;
d7cdc9e8 PM	134
0c7b1df6	135	jump_to_P2();
d7cdc9e8	136	ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
0c7b1df6	137	back_to_P1();
d7cdc9e8 PM	138
d7cdc9e8 PM	139	return ret;
0c7b1df6 PM	140	}
	141
	142	void clear_pmb_entry(struct pmb_entry *pmbe)
	143	{
	144	unsigned int entry = pmbe->entry;
	145	unsigned long addr;
	146
	147	/*
	148	* Don't allow clearing of wired init entries, P1 or P2 access
	149	* without a corresponding mapping in the PMB will lead to reset
	150	* by the TLB.
	151	*/
	152	if (unlikely(entry < ARRAY_SIZE(pmb_init_map) \|\|
	153	entry >= NR_PMB_ENTRIES))
	154	return;
	155
	156	jump_to_P2();
	157
	158	/* Clear V-bit */
	159	addr = mk_pmb_addr(entry);
	160	ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
	161
	162	addr = mk_pmb_data(entry);
	163	ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
	164
	165	back_to_P1();
	166
	167	clear_bit(entry, &pmb_map);
	168	}
	169
d7cdc9e8 PM	170	static DEFINE_SPINLOCK(pmb_list_lock);
	171	static struct pmb_entry *pmb_list;
	172
	173	static inline void pmb_list_add(struct pmb_entry *pmbe)
	174	{
	175	struct pmb_entry *p, tmp;
	176
	177	p = &pmb_list;
	178	while ((tmp = *p) != NULL)
	179	p = &tmp->next;
	180
	181	pmbe->next = tmp;
	182	*p = pmbe;
	183	}
	184
	185	static inline void pmb_list_del(struct pmb_entry *pmbe)
	186	{
	187	struct pmb_entry *p, tmp;
	188
	189	for (p = &pmb_list; (tmp = *p); p = &tmp->next)
	190	if (tmp == pmbe) {
	191	*p = tmp->next;
	192	return;
	193	}
	194	}
	195
	196	static struct {
	197	unsigned long size;
	198	int flag;
	199	} pmb_sizes[] = {
	200	{ .size = 0x20000000, .flag = PMB_SZ_512M, },
	201	{ .size = 0x08000000, .flag = PMB_SZ_128M, },
	202	{ .size = 0x04000000, .flag = PMB_SZ_64M, },
	203	{ .size = 0x01000000, .flag = PMB_SZ_16M, },
	204	};
	205
	206	long pmb_remap(unsigned long vaddr, unsigned long phys,
	207	unsigned long size, unsigned long flags)
	208	{
	209	struct pmb_entry *pmbp;
	210	unsigned long wanted;
	211	int pmb_flags, i;
	212
	213	/* Convert typical pgprot value to the PMB equivalent */
	214	if (flags & _PAGE_CACHABLE) {
	215	if (flags & _PAGE_WT)
	216	pmb_flags = PMB_WT;
	217	else
	218	pmb_flags = PMB_C;
	219	} else
	220	pmb_flags = PMB_WT \| PMB_UB;
	221
	222	pmbp = NULL;
	223	wanted = size;
	224
	225	again:
	226	for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
	227	struct pmb_entry *pmbe;
	228	int ret;
	229
	230	if (size < pmb_sizes[i].size)
	231	continue;
	232
	233	pmbe = pmb_alloc(vaddr, phys, pmb_flags \| pmb_sizes[i].flag);
234	if (IS_ERR(pmbe))
235	return PTR_ERR(pmbe);
236
237	ret = set_pmb_entry(pmbe);
238	if (ret != 0) {
239	pmb_free(pmbe);
240	return -EBUSY;
241	}
242
243	phys += pmb_sizes[i].size;
244	vaddr += pmb_sizes[i].size;
245	size -= pmb_sizes[i].size;
246
247	/*
248	* Link adjacent entries that span multiple PMB entries
249	* for easier tear-down.
250	*/
251	if (likely(pmbp))
252	pmbp->link = pmbe;
253
254	pmbp = pmbe;
255	}
256
257	if (size >= 0x1000000)
258	goto again;
259
260	return wanted - size;
261	}
262
263	void pmb_unmap(unsigned long addr)
264	{
265	struct pmb_entry *p, pmbe;
266
267	for (p = &pmb_list; (pmbe = *p); p = &pmbe->next)
268	if (pmbe->vpn == addr)
269	break;
270
271	if (unlikely(!pmbe))
272	return;
273
274	WARN_ON(!test_bit(pmbe->entry, &pmb_map));
275
276	do {
277	struct pmb_entry *pmblink = pmbe;
278
279	clear_pmb_entry(pmbe);
280	pmbe = pmblink->link;
281
282	pmb_free(pmblink);
283	} while (pmbe);
284	}
285
e18b890b	286	static void pmb_cache_ctor(void pmb, struct kmem_cache cachep, unsigned long flags)
0c7b1df6	287	{
d7cdc9e8 PM	288	struct pmb_entry *pmbe = pmb;
d7cdc9e8 PM	289
0c7b1df6 PM	290	memset(pmb, 0, sizeof(struct pmb_entry));
0c7b1df6 PM	291
d7cdc9e8 PM	292	spin_lock_irq(&pmb_list_lock);
	293
	294	pmbe->entry = PMB_NO_ENTRY;
	295	pmb_list_add(pmbe);
	296
	297	spin_unlock_irq(&pmb_list_lock);
	298	}
	299
e18b890b	300	static void pmb_cache_dtor(void pmb, struct kmem_cache cachep, unsigned long flags)
d7cdc9e8 PM	301	{
	302	spin_lock_irq(&pmb_list_lock);
	303	pmb_list_del(pmb);
	304	spin_unlock_irq(&pmb_list_lock);
0c7b1df6 PM	305	}
	306
	307	static int __init pmb_init(void)
	308	{
	309	unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
	310	unsigned int entry;
	311
	312	BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
	313
	314	pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry),
d7cdc9e8	315	0, 0, pmb_cache_ctor, pmb_cache_dtor);
0c7b1df6 PM	316	BUG_ON(!pmb_cache);
	317
	318	jump_to_P2();
	319
	320	/*
	321	* Ordering is important, P2 must be mapped in the PMB before we
	322	* can set PMB.SE, and P1 must be mapped before we jump back to
	323	* P1 space.
	324	*/
	325	for (entry = 0; entry < nr_entries; entry++) {
	326	struct pmb_entry *pmbe = pmb_init_map + entry;
	327
	328	__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
	329	}
	330
	331	ctrl_outl(0, PMB_IRMCR);
	332
	333	/* PMB.SE and UB[7] */
	334	ctrl_outl((1 << 31) \| (1 << 7), PMB_PASCR);
	335
	336	back_to_P1();
	337
	338	return 0;
	339	}
0c7b1df6 PM	340	arch_initcall(pmb_init);
0c7b1df6 PM	341
0c7b1df6 PM	342	static int pmb_seq_show(struct seq_file file, void iter)
	343	{
	344	int i;
	345
	346	seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
	347	"CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
	348	seq_printf(file, "ety vpn ppn size flags\n");
	349
	350	for (i = 0; i < NR_PMB_ENTRIES; i++) {
	351	unsigned long addr, data;
	352	unsigned int size;
	353	char *sz_str = NULL;
	354
	355	addr = ctrl_inl(mk_pmb_addr(i));
	356	data = ctrl_inl(mk_pmb_data(i));
	357
	358	size = data & PMB_SZ_MASK;
	359	sz_str = (size == PMB_SZ_16M) ? " 16MB":
	360	(size == PMB_SZ_64M) ? " 64MB":
	361	(size == PMB_SZ_128M) ? "128MB":
	362	"512MB";
	363
	364	/* 02: V 0x88 0x08 128MB C CB B */
	365	seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
	366	i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
	367	(addr >> 24) & 0xff, (data >> 24) & 0xff,
	368	sz_str, (data & PMB_C) ? 'C' : ' ',
	369	(data & PMB_WT) ? "WT" : "CB",
	370	(data & PMB_UB) ? "UB" : " B");
	371	}
	372
	373	return 0;
	374	}
	375
	376	static int pmb_debugfs_open(struct inode inode, struct file file)
	377	{
	378	return single_open(file, pmb_seq_show, NULL);
	379	}
	380
5dfe4c96	381	static const struct file_operations pmb_debugfs_fops = {
0c7b1df6 PM	382	.owner = THIS_MODULE,
	383	.open = pmb_debugfs_open,
	384	.read = seq_read,
	385	.llseek = seq_lseek,
	386	.release = seq_release,
	387	};
	388
	389	static int __init pmb_debugfs_init(void)
	390	{
	391	struct dentry *dentry;
	392
	393	dentry = debugfs_create_file("pmb", S_IFREG \| S_IRUGO,
	394	NULL, NULL, &pmb_debugfs_fops);
	395	if (IS_ERR(dentry))
	396	return PTR_ERR(dentry);
	397
	398	return 0;
	399	}
0c7b1df6	400	postcore_initcall(pmb_debugfs_init);