/*
   * arch/sh/mm/pmb.c
   *
   * Privileged Space Mapping Buffer (PMB) Support.
   *
   * Copyright (C) 2005 - 2011  Paul Mundt
   * Copyright (C) 2010  Matt Fleming
   *
   * 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/syscore_ops.h>
  #include <linux/cpu.h>
  #include <linux/module.h>
  #include <linux/bitops.h>
  #include <linux/debugfs.h>
  #include <linux/fs.h>
  #include <linux/seq_file.h>
  #include <linux/err.h>
  #include <linux/io.h>
  #include <linux/spinlock.h>
  #include <linux/vmalloc.h>
  #include <asm/cacheflush.h>
  #include <asm/sizes.h>
  #include <asm/uaccess.h>
  #include <asm/pgtable.h>
  #include <asm/page.h>
  #include <asm/mmu.h>
  #include <asm/mmu_context.h>
  
  struct pmb_entry;
  
  struct pmb_entry {
  	unsigned long vpn;
  	unsigned long ppn;
  	unsigned long flags;
  	unsigned long size;
  
  	raw_spinlock_t lock;
  
  	/*
  	 * 0 .. NR_PMB_ENTRIES for specific entry selection, or
  	 * PMB_NO_ENTRY to search for a free one
  	 */
  	int entry;
  
  	/* Adjacent entry link for contiguous multi-entry mappings */
  	struct pmb_entry *link;
  };
  
  static struct {
  	unsigned long size;
  	int flag;
  } pmb_sizes[] = {
  	{ .size	= SZ_512M, .flag = PMB_SZ_512M, },
  	{ .size = SZ_128M, .flag = PMB_SZ_128M, },
  	{ .size = SZ_64M,  .flag = PMB_SZ_64M,  },
  	{ .size = SZ_16M,  .flag = PMB_SZ_16M,  },
  };
  
  static void pmb_unmap_entry(struct pmb_entry *, int depth);
  
  static DEFINE_RWLOCK(pmb_rwlock);
  static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
  static DECLARE_BITMAP(pmb_map, NR_PMB_ENTRIES);
  
  static unsigned int pmb_iomapping_enabled;
  
  static __always_inline unsigned long mk_pmb_entry(unsigned int entry)
  {
  	return (entry & PMB_E_MASK) << PMB_E_SHIFT;
  }
  
  static __always_inline unsigned long mk_pmb_addr(unsigned int entry)
  {
  	return mk_pmb_entry(entry) | PMB_ADDR;
  }
  
  static __always_inline unsigned long mk_pmb_data(unsigned int entry)
  {
  	return mk_pmb_entry(entry) | PMB_DATA;
  }
  
  static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn)
  {
  	return ppn >= __pa(memory_start) && ppn < __pa(memory_end);
  }
  
  /*
   * Ensure that the PMB entries match our cache configuration.
   *
   * When we are in 32-bit address extended mode, CCR.CB becomes
   * invalid, so care must be taken to manually adjust cacheable
   * translations.
   */
  static __always_inline unsigned long pmb_cache_flags(void)
  {
  	unsigned long flags = 0;
  
  #if defined(CONFIG_CACHE_OFF)
  	flags |= PMB_WT | PMB_UB;
  #elif defined(CONFIG_CACHE_WRITETHROUGH)
  	flags |= PMB_C | PMB_WT | PMB_UB;
  #elif defined(CONFIG_CACHE_WRITEBACK)
  	flags |= PMB_C;
  #endif
  
  	return flags;
  }
  
  /*
   * Convert typical pgprot value to the PMB equivalent
   */
  static inline unsigned long pgprot_to_pmb_flags(pgprot_t prot)
  {
  	unsigned long pmb_flags = 0;
  	u64 flags = pgprot_val(prot);
  
  	if (flags & _PAGE_CACHABLE)
  		pmb_flags |= PMB_C;
  	if (flags & _PAGE_WT)
  		pmb_flags |= PMB_WT | PMB_UB;
  
  	return pmb_flags;
  }
  
  static inline bool pmb_can_merge(struct pmb_entry *a, struct pmb_entry *b)
  {
  	return (b->vpn == (a->vpn + a->size)) &&
  	       (b->ppn == (a->ppn + a->size)) &&
  	       (b->flags == a->flags);
  }
  
  static bool pmb_mapping_exists(unsigned long vaddr, phys_addr_t phys,
  			       unsigned long size)
  {
  	int i;
  
  	read_lock(&pmb_rwlock);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
  		struct pmb_entry *pmbe, *iter;
  		unsigned long span;
  
  		if (!test_bit(i, pmb_map))
  			continue;
  
  		pmbe = &pmb_entry_list[i];
  
  		/*
  		 * See if VPN and PPN are bounded by an existing mapping.
  		 */
  		if ((vaddr < pmbe->vpn) || (vaddr >= (pmbe->vpn + pmbe->size)))
  			continue;
  		if ((phys < pmbe->ppn) || (phys >= (pmbe->ppn + pmbe->size)))
  			continue;
  
  		/*
  		 * Now see if we're in range of a simple mapping.
  		 */
  		if (size <= pmbe->size) {
  			read_unlock(&pmb_rwlock);
  			return true;
  		}
  
  		span = pmbe->size;
  
  		/*
  		 * Finally for sizes that involve compound mappings, walk
  		 * the chain.
  		 */
  		for (iter = pmbe->link; iter; iter = iter->link)
  			span += iter->size;
  
  		/*
  		 * Nothing else to do if the range requirements are met.
  		 */
  		if (size <= span) {
  			read_unlock(&pmb_rwlock);
  			return true;
  		}
  	}
  
  	read_unlock(&pmb_rwlock);
  	return false;
  }
  
  static bool pmb_size_valid(unsigned long size)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
  		if (pmb_sizes[i].size == size)
  			return true;
  
  	return false;
  }
  
  static inline bool pmb_addr_valid(unsigned long addr, unsigned long size)
  {
  	return (addr >= P1SEG && (addr + size - 1) < P3SEG);
  }
  
  static inline bool pmb_prot_valid(pgprot_t prot)
  {
  	return (pgprot_val(prot) & _PAGE_USER) == 0;
  }
  
  static int pmb_size_to_flags(unsigned long size)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
  		if (pmb_sizes[i].size == size)
  			return pmb_sizes[i].flag;
  
  	return 0;
  }
  
  static int pmb_alloc_entry(void)
  {
  	int pos;
  
  	pos = find_first_zero_bit(pmb_map, NR_PMB_ENTRIES);
  	if (pos >= 0 && pos < NR_PMB_ENTRIES)
  		__set_bit(pos, pmb_map);
  	else
  		pos = -ENOSPC;
  
  	return pos;
  }
  
  static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
  				   unsigned long flags, int entry)
  {
  	struct pmb_entry *pmbe;
  	unsigned long irqflags;
  	void *ret = NULL;
  	int pos;
  
  	write_lock_irqsave(&pmb_rwlock, irqflags);
  
  	if (entry == PMB_NO_ENTRY) {
  		pos = pmb_alloc_entry();
  		if (unlikely(pos < 0)) {
  			ret = ERR_PTR(pos);
  			goto out;
  		}
  	} else {
  		if (__test_and_set_bit(entry, pmb_map)) {
  			ret = ERR_PTR(-ENOSPC);
  			goto out;
  		}
  
  		pos = entry;
  	}
  
  	write_unlock_irqrestore(&pmb_rwlock, irqflags);
  
  	pmbe = &pmb_entry_list[pos];
  
  	memset(pmbe, 0, sizeof(struct pmb_entry));
  
  	raw_spin_lock_init(&pmbe->lock);
  
  	pmbe->vpn	= vpn;
  	pmbe->ppn	= ppn;
  	pmbe->flags	= flags;
  	pmbe->entry	= pos;
  
  	return pmbe;
  
  out:
  	write_unlock_irqrestore(&pmb_rwlock, irqflags);
  	return ret;
  }
  
  static void pmb_free(struct pmb_entry *pmbe)
  {
  	__clear_bit(pmbe->entry, pmb_map);
  
  	pmbe->entry	= PMB_NO_ENTRY;
  	pmbe->link	= NULL;
  }
  
  /*
   * Must be run uncached.
   */
  static void __set_pmb_entry(struct pmb_entry *pmbe)
  {
  	unsigned long addr, data;
  
  	addr = mk_pmb_addr(pmbe->entry);
  	data = mk_pmb_data(pmbe->entry);
  
  	jump_to_uncached();
  
  	/* Set V-bit */
  	__raw_writel(pmbe->vpn | PMB_V, addr);
  	__raw_writel(pmbe->ppn | pmbe->flags | PMB_V, data);
  
  	back_to_cached();
  }
  
  static void __clear_pmb_entry(struct pmb_entry *pmbe)
  {
  	unsigned long addr, data;
  	unsigned long addr_val, data_val;
  
  	addr = mk_pmb_addr(pmbe->entry);
  	data = mk_pmb_data(pmbe->entry);
  
  	addr_val = __raw_readl(addr);
  	data_val = __raw_readl(data);
  
  	/* Clear V-bit */
  	writel_uncached(addr_val & ~PMB_V, addr);
  	writel_uncached(data_val & ~PMB_V, data);
  }
  
  #ifdef CONFIG_PM
  static void set_pmb_entry(struct pmb_entry *pmbe)
  {
  	unsigned long flags;
  
  	raw_spin_lock_irqsave(&pmbe->lock, flags);
  	__set_pmb_entry(pmbe);
  	raw_spin_unlock_irqrestore(&pmbe->lock, flags);
  }
  #endif /* CONFIG_PM */
  
  int pmb_bolt_mapping(unsigned long vaddr, phys_addr_t phys,
  		     unsigned long size, pgprot_t prot)
  {
  	struct pmb_entry *pmbp, *pmbe;
  	unsigned long orig_addr, orig_size;
  	unsigned long flags, pmb_flags;
  	int i, mapped;
  
  	if (size < SZ_16M)
  		return -EINVAL;
  	if (!pmb_addr_valid(vaddr, size))
  		return -EFAULT;
  	if (pmb_mapping_exists(vaddr, phys, size))
  		return 0;
  
  	orig_addr = vaddr;
  	orig_size = size;
  
  	flush_tlb_kernel_range(vaddr, vaddr + size);
  
  	pmb_flags = pgprot_to_pmb_flags(prot);
  	pmbp = NULL;
  
  	do {
  		for (i = mapped = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
  			if (size < pmb_sizes[i].size)
  				continue;
  
  			pmbe = pmb_alloc(vaddr, phys, pmb_flags |
  					 pmb_sizes[i].flag, PMB_NO_ENTRY);
  			if (IS_ERR(pmbe)) {
  				pmb_unmap_entry(pmbp, mapped);
  				return PTR_ERR(pmbe);
  			}
  
  			raw_spin_lock_irqsave(&pmbe->lock, flags);
  
  			pmbe->size = pmb_sizes[i].size;
  
  			__set_pmb_entry(pmbe);
  
  			phys	+= pmbe->size;
  			vaddr	+= pmbe->size;
  			size	-= pmbe->size;
  
  			/*
  			 * Link adjacent entries that span multiple PMB
  			 * entries for easier tear-down.
  			 */
  			if (likely(pmbp)) {
  				raw_spin_lock_nested(&pmbp->lock,
  						     SINGLE_DEPTH_NESTING);
  				pmbp->link = pmbe;
  				raw_spin_unlock(&pmbp->lock);
  			}
  
  			pmbp = pmbe;
  
  			/*
  			 * Instead of trying smaller sizes on every
  			 * iteration (even if we succeed in allocating
  			 * space), try using pmb_sizes[i].size again.
  			 */
  			i--;
  			mapped++;
  
  			raw_spin_unlock_irqrestore(&pmbe->lock, flags);
  		}
  	} while (size >= SZ_16M);
  
  	flush_cache_vmap(orig_addr, orig_addr + orig_size);
  
  	return 0;
  }
  
  void __iomem *pmb_remap_caller(phys_addr_t phys, unsigned long size,
  			       pgprot_t prot, void *caller)
  {
  	unsigned long vaddr;
  	phys_addr_t offset, last_addr;
  	phys_addr_t align_mask;
  	unsigned long aligned;
  	struct vm_struct *area;
  	int i, ret;
  
  	if (!pmb_iomapping_enabled)
  		return NULL;
  
  	/*
  	 * Small mappings need to go through the TLB.
  	 */
  	if (size < SZ_16M)
  		return ERR_PTR(-EINVAL);
  	if (!pmb_prot_valid(prot))
  		return ERR_PTR(-EINVAL);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++)
  		if (size >= pmb_sizes[i].size)
  			break;
  
  	last_addr = phys + size;
  	align_mask = ~(pmb_sizes[i].size - 1);
  	offset = phys & ~align_mask;
  	phys &= align_mask;
  	aligned = ALIGN(last_addr, pmb_sizes[i].size) - phys;
  
  	/*
  	 * XXX: This should really start from uncached_end, but this
  	 * causes the MMU to reset, so for now we restrict it to the
  	 * 0xb000...0xc000 range.
  	 */
  	area = __get_vm_area_caller(aligned, VM_IOREMAP, 0xb0000000,
  				    P3SEG, caller);
  	if (!area)
  		return NULL;
  
  	area->phys_addr = phys;
  	vaddr = (unsigned long)area->addr;
  
  	ret = pmb_bolt_mapping(vaddr, phys, size, prot);
  	if (unlikely(ret != 0))
  		return ERR_PTR(ret);
  
  	return (void __iomem *)(offset + (char *)vaddr);
  }
  
  int pmb_unmap(void __iomem *addr)
  {
  	struct pmb_entry *pmbe = NULL;
  	unsigned long vaddr = (unsigned long __force)addr;
  	int i, found = 0;
  
  	read_lock(&pmb_rwlock);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
  		if (test_bit(i, pmb_map)) {
  			pmbe = &pmb_entry_list[i];
  			if (pmbe->vpn == vaddr) {
  				found = 1;
  				break;
  			}
  		}
  	}
  
  	read_unlock(&pmb_rwlock);
  
  	if (found) {
  		pmb_unmap_entry(pmbe, NR_PMB_ENTRIES);
  		return 0;
  	}
  
  	return -EINVAL;
  }
  
  static void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
  {
  	do {
  		struct pmb_entry *pmblink = pmbe;
  
  		/*
  		 * We may be called before this pmb_entry has been
  		 * entered into the PMB table via set_pmb_entry(), but
  		 * that's OK because we've allocated a unique slot for
  		 * this entry in pmb_alloc() (even if we haven't filled
  		 * it yet).
  		 *
  		 * Therefore, calling __clear_pmb_entry() is safe as no
  		 * other mapping can be using that slot.
  		 */
  		__clear_pmb_entry(pmbe);
  
  		flush_cache_vunmap(pmbe->vpn, pmbe->vpn + pmbe->size);
  
  		pmbe = pmblink->link;
  
  		pmb_free(pmblink);
  	} while (pmbe && --depth);
  }
  
  static void pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
  {
  	unsigned long flags;
  
  	if (unlikely(!pmbe))
  		return;
  
  	write_lock_irqsave(&pmb_rwlock, flags);
  	__pmb_unmap_entry(pmbe, depth);
  	write_unlock_irqrestore(&pmb_rwlock, flags);
  }
  
  static void __init pmb_notify(void)
  {
  	int i;
  
  	pr_info("PMB: boot mappings:
  ");
  
  	read_lock(&pmb_rwlock);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
  		struct pmb_entry *pmbe;
  
  		if (!test_bit(i, pmb_map))
  			continue;
  
  		pmbe = &pmb_entry_list[i];
  
  		pr_info("       0x%08lx -> 0x%08lx [ %4ldMB %2scached ]
  ",
  			pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT,
  			pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un");
  	}
  
  	read_unlock(&pmb_rwlock);
  }
  
  /*
   * Sync our software copy of the PMB mappings with those in hardware. The
   * mappings in the hardware PMB were either set up by the bootloader or
   * very early on by the kernel.
   */
  static void __init pmb_synchronize(void)
  {
  	struct pmb_entry *pmbp = NULL;
  	int i, j;
  
  	/*
  	 * Run through the initial boot mappings, log the established
  	 * ones, and blow away anything that falls outside of the valid
  	 * PPN range. Specifically, we only care about existing mappings
  	 * that impact the cached/uncached sections.
  	 *
  	 * Note that touching these can be a bit of a minefield; the boot
  	 * loader can establish multi-page mappings with the same caching
  	 * attributes, so we need to ensure that we aren't modifying a
  	 * mapping that we're presently executing from, or may execute
  	 * from in the case of straddling page boundaries.
  	 *
  	 * In the future we will have to tidy up after the boot loader by
  	 * jumping between the cached and uncached mappings and tearing
  	 * down alternating mappings while executing from the other.
  	 */
  	for (i = 0; i < NR_PMB_ENTRIES; i++) {
  		unsigned long addr, data;
  		unsigned long addr_val, data_val;
  		unsigned long ppn, vpn, flags;
  		unsigned long irqflags;
  		unsigned int size;
  		struct pmb_entry *pmbe;
  
  		addr = mk_pmb_addr(i);
  		data = mk_pmb_data(i);
  
  		addr_val = __raw_readl(addr);
  		data_val = __raw_readl(data);
  
  		/*
  		 * Skip over any bogus entries
  		 */
  		if (!(data_val & PMB_V) || !(addr_val & PMB_V))
  			continue;
  
  		ppn = data_val & PMB_PFN_MASK;
  		vpn = addr_val & PMB_PFN_MASK;
  
  		/*
  		 * Only preserve in-range mappings.
  		 */
  		if (!pmb_ppn_in_range(ppn)) {
  			/*
  			 * Invalidate anything out of bounds.
  			 */
  			writel_uncached(addr_val & ~PMB_V, addr);
  			writel_uncached(data_val & ~PMB_V, data);
  			continue;
  		}
  
  		/*
  		 * Update the caching attributes if necessary
  		 */
  		if (data_val & PMB_C) {
  			data_val &= ~PMB_CACHE_MASK;
  			data_val |= pmb_cache_flags();
  
  			writel_uncached(data_val, data);
  		}
  
  		size = data_val & PMB_SZ_MASK;
  		flags = size | (data_val & PMB_CACHE_MASK);
  
  		pmbe = pmb_alloc(vpn, ppn, flags, i);
  		if (IS_ERR(pmbe)) {
  			WARN_ON_ONCE(1);
  			continue;
  		}
  
  		raw_spin_lock_irqsave(&pmbe->lock, irqflags);
  
  		for (j = 0; j < ARRAY_SIZE(pmb_sizes); j++)
  			if (pmb_sizes[j].flag == size)
  				pmbe->size = pmb_sizes[j].size;
  
  		if (pmbp) {
  			raw_spin_lock_nested(&pmbp->lock, SINGLE_DEPTH_NESTING);
  			/*
  			 * Compare the previous entry against the current one to
  			 * see if the entries span a contiguous mapping. If so,
  			 * setup the entry links accordingly. Compound mappings
  			 * are later coalesced.
  			 */
  			if (pmb_can_merge(pmbp, pmbe))
  				pmbp->link = pmbe;
  			raw_spin_unlock(&pmbp->lock);
  		}
  
  		pmbp = pmbe;
  
  		raw_spin_unlock_irqrestore(&pmbe->lock, irqflags);
  	}
  }
  
  static void __init pmb_merge(struct pmb_entry *head)
  {
  	unsigned long span, newsize;
  	struct pmb_entry *tail;
  	int i = 1, depth = 0;
  
  	span = newsize = head->size;
  
  	tail = head->link;
  	while (tail) {
  		span += tail->size;
  
  		if (pmb_size_valid(span)) {
  			newsize = span;
  			depth = i;
  		}
  
  		/* This is the end of the line.. */
  		if (!tail->link)
  			break;
  
  		tail = tail->link;
  		i++;
  	}
  
  	/*
  	 * The merged page size must be valid.
  	 */
  	if (!depth || !pmb_size_valid(newsize))
  		return;
  
  	head->flags &= ~PMB_SZ_MASK;
  	head->flags |= pmb_size_to_flags(newsize);
  
  	head->size = newsize;
  
  	__pmb_unmap_entry(head->link, depth);
  	__set_pmb_entry(head);
  }
  
  static void __init pmb_coalesce(void)
  {
  	unsigned long flags;
  	int i;
  
  	write_lock_irqsave(&pmb_rwlock, flags);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
  		struct pmb_entry *pmbe;
  
  		if (!test_bit(i, pmb_map))
  			continue;
  
  		pmbe = &pmb_entry_list[i];
  
  		/*
  		 * We're only interested in compound mappings
  		 */
  		if (!pmbe->link)
  			continue;
  
  		/*
  		 * Nothing to do if it already uses the largest possible
  		 * page size.
  		 */
  		if (pmbe->size == SZ_512M)
  			continue;
  
  		pmb_merge(pmbe);
  	}
  
  	write_unlock_irqrestore(&pmb_rwlock, flags);
  }
  
  #ifdef CONFIG_UNCACHED_MAPPING
  static void __init pmb_resize(void)
  {
  	int i;
  
  	/*
  	 * If the uncached mapping was constructed by the kernel, it will
  	 * already be a reasonable size.
  	 */
  	if (uncached_size == SZ_16M)
  		return;
  
  	read_lock(&pmb_rwlock);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
  		struct pmb_entry *pmbe;
  		unsigned long flags;
  
  		if (!test_bit(i, pmb_map))
  			continue;
  
  		pmbe = &pmb_entry_list[i];
  
  		if (pmbe->vpn != uncached_start)
  			continue;
  
  		/*
  		 * Found it, now resize it.
  		 */
  		raw_spin_lock_irqsave(&pmbe->lock, flags);
  
  		pmbe->size = SZ_16M;
  		pmbe->flags &= ~PMB_SZ_MASK;
  		pmbe->flags |= pmb_size_to_flags(pmbe->size);
  
  		uncached_resize(pmbe->size);
  
  		__set_pmb_entry(pmbe);
  
  		raw_spin_unlock_irqrestore(&pmbe->lock, flags);
  	}
  
  	read_unlock(&pmb_rwlock);
  }
  #endif
  
  static int __init early_pmb(char *p)
  {
  	if (!p)
  		return 0;
  
  	if (strstr(p, "iomap"))
  		pmb_iomapping_enabled = 1;
  
  	return 0;
  }
  early_param("pmb", early_pmb);
  
  void __init pmb_init(void)
  {
  	/* Synchronize software state */
  	pmb_synchronize();
  
  	/* Attempt to combine compound mappings */
  	pmb_coalesce();
  
  #ifdef CONFIG_UNCACHED_MAPPING
  	/* Resize initial mappings, if necessary */
  	pmb_resize();
  #endif
  
  	/* Log them */
  	pmb_notify();
  
  	writel_uncached(0, PMB_IRMCR);
  
  	/* Flush out the TLB */
  	local_flush_tlb_all();
  	ctrl_barrier();
  }
  
  bool __in_29bit_mode(void)
  {
          return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0;
  }
  
  static int pmb_seq_show(struct seq_file *file, void *iter)
  {
  	int i;
  
  	seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through
  "
  			 "CB: Copy-Back, B: Buffered, UB: Unbuffered
  ");
  	seq_printf(file, "ety   vpn  ppn  size   flags
  ");
  
  	for (i = 0; i < NR_PMB_ENTRIES; i++) {
  		unsigned long addr, data;
  		unsigned int size;
  		char *sz_str = NULL;
  
  		addr = __raw_readl(mk_pmb_addr(i));
  		data = __raw_readl(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
  ",
  			   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	= single_release,
  };
  
  static int __init pmb_debugfs_init(void)
  {
  	struct dentry *dentry;
  
  	dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
  				     arch_debugfs_dir, NULL, &pmb_debugfs_fops);
  	if (!dentry)
  		return -ENOMEM;
  
  	return 0;
  }
  subsys_initcall(pmb_debugfs_init);
  
  #ifdef CONFIG_PM
  static void pmb_syscore_resume(void)
  {
  	struct pmb_entry *pmbe;
  	int i;
  
  	read_lock(&pmb_rwlock);
  
  	for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
  		if (test_bit(i, pmb_map)) {
  			pmbe = &pmb_entry_list[i];
  			set_pmb_entry(pmbe);
  		}
  	}
  
  	read_unlock(&pmb_rwlock);
  }
  
  static struct syscore_ops pmb_syscore_ops = {
  	.resume = pmb_syscore_resume,
  };
  
  static int __init pmb_sysdev_init(void)
  {
  	register_syscore_ops(&pmb_syscore_ops);
  	return 0;
  }
  subsys_initcall(pmb_sysdev_init);
  #endif