*
* 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.
+ * Copyright (C) 2005 - 2010 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
*/
#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/sysdev.h>
+#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/rwlock.h>
+#include <asm/sizes.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
+#include <asm/page.h>
#include <asm/mmu.h>
-#include <asm/io.h>
-
-#define NR_PMB_ENTRIES 16
-
-static kmem_cache_t *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, },
+#include <asm/mmu_context.h>
+
+struct pmb_entry;
+
+struct pmb_entry {
+ unsigned long vpn;
+ unsigned long ppn;
+ unsigned long flags;
+ unsigned long size;
+
+ 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 inline unsigned long mk_pmb_entry(unsigned int entry)
+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 __always_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)
+static __always_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)
+static __always_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)
+static int pmb_alloc_entry(void)
{
- struct pmb_entry *pmbe;
+ int pos;
- pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
- if (!pmbe)
- return ERR_PTR(-ENOMEM);
+ 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;
- pmbe->vpn = vpn;
- pmbe->ppn = ppn;
- pmbe->flags = flags;
-
- return pmbe;
-}
-
-void pmb_free(struct pmb_entry *pmbe)
-{
- kmem_cache_free(pmb_cache, pmbe);
+ return pos;
}
-/*
- * Must be in P2 for __set_pmb_entry()
- */
-int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
- unsigned long flags, int *entry)
+static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
+ unsigned long flags, int entry)
{
- unsigned int pos = *entry;
+ struct pmb_entry *pmbe;
+ unsigned long irqflags;
+ void *ret = NULL;
+ int pos;
- if (unlikely(pos == PMB_NO_ENTRY))
- pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
+ write_lock_irqsave(&pmb_rwlock, irqflags);
-repeat:
- if (unlikely(pos > NR_PMB_ENTRIES))
- return -ENOSPC;
+ 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;
+ }
- if (test_and_set_bit(pos, &pmb_map)) {
- pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
- goto repeat;
+ pos = entry;
}
- ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos));
+ write_unlock_irqrestore(&pmb_rwlock, irqflags);
-#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
+ pmbe = &pmb_entry_list[pos];
- ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));
+ memset(pmbe, 0, sizeof(struct pmb_entry));
- *entry = pos;
+ spin_lock_init(&pmbe->lock);
- return 0;
-}
-
-int set_pmb_entry(struct pmb_entry *pmbe)
-{
- int ret;
+ pmbe->vpn = vpn;
+ pmbe->ppn = ppn;
+ pmbe->flags = flags;
+ pmbe->entry = pos;
- jump_to_P2();
- ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
- back_to_P1();
+ return pmbe;
+out:
+ write_unlock_irqrestore(&pmb_rwlock, irqflags);
return ret;
}
-void clear_pmb_entry(struct pmb_entry *pmbe)
+static void pmb_free(struct pmb_entry *pmbe)
{
- unsigned int entry = pmbe->entry;
- unsigned long addr;
+ __clear_bit(pmbe->entry, pmb_map);
- /*
- * 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);
+ pmbe->entry = PMB_NO_ENTRY;
+ pmbe->link = NULL;
+}
- addr = mk_pmb_data(entry);
- ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
+/*
+ * 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;
- back_to_P1();
+#if defined(CONFIG_CACHE_WRITETHROUGH)
+ flags |= PMB_C | PMB_WT | PMB_UB;
+#elif defined(CONFIG_CACHE_WRITEBACK)
+ flags |= PMB_C;
+#endif
- clear_bit(entry, &pmb_map);
+ return flags;
}
-static DEFINE_SPINLOCK(pmb_list_lock);
-static struct pmb_entry *pmb_list;
+/*
+ * Must be run uncached.
+ */
+static void __set_pmb_entry(struct pmb_entry *pmbe)
+{
+ writel_uncached(pmbe->vpn | PMB_V, mk_pmb_addr(pmbe->entry));
+ writel_uncached(pmbe->ppn | pmbe->flags | PMB_V,
+ mk_pmb_data(pmbe->entry));
+}
-static inline void pmb_list_add(struct pmb_entry *pmbe)
+static void __clear_pmb_entry(struct pmb_entry *pmbe)
{
- struct pmb_entry **p, *tmp;
+ unsigned long addr, data;
+ unsigned long addr_val, data_val;
+
+ addr = mk_pmb_addr(pmbe->entry);
+ data = mk_pmb_data(pmbe->entry);
- p = &pmb_list;
- while ((tmp = *p) != NULL)
- p = &tmp->next;
+ addr_val = __raw_readl(addr);
+ data_val = __raw_readl(data);
- pmbe->next = tmp;
- *p = pmbe;
+ /* Clear V-bit */
+ writel_uncached(addr_val & ~PMB_V, addr);
+ writel_uncached(data_val & ~PMB_V, data);
}
-static inline void pmb_list_del(struct pmb_entry *pmbe)
+static void set_pmb_entry(struct pmb_entry *pmbe)
{
- struct pmb_entry **p, *tmp;
+ unsigned long flags;
- for (p = &pmb_list; (tmp = *p); p = &tmp->next)
- if (tmp == pmbe) {
- *p = tmp->next;
- return;
- }
+ spin_lock_irqsave(&pmbe->lock, flags);
+ __set_pmb_entry(pmbe);
+ spin_unlock_irqrestore(&pmbe->lock, flags);
}
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, },
+ { .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, },
};
long pmb_remap(unsigned long vaddr, unsigned long phys,
- unsigned long size, unsigned long flags)
+ unsigned long size, pgprot_t prot)
{
- struct pmb_entry *pmbp;
+ struct pmb_entry *pmbp, *pmbe;
unsigned long wanted;
int pmb_flags, i;
+ long err;
+ u64 flags;
+
+ flags = pgprot_val(prot);
+
+ pmb_flags = PMB_WT | PMB_UB;
/* 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;
+ pmb_flags |= PMB_C;
+
+ if ((flags & _PAGE_WT) == 0)
+ 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;
+ unsigned long flags;
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;
+ pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag,
+ PMB_NO_ENTRY);
+ if (IS_ERR(pmbe)) {
+ err = PTR_ERR(pmbe);
+ goto out;
}
+ spin_lock_irqsave(&pmbe->lock, flags);
+
+ __set_pmb_entry(pmbe);
+
phys += pmb_sizes[i].size;
vaddr += pmb_sizes[i].size;
size -= pmb_sizes[i].size;
+ pmbe->size = pmb_sizes[i].size;
+
/*
* Link adjacent entries that span multiple PMB entries
* for easier tear-down.
*/
- if (likely(pmbp))
+ if (likely(pmbp)) {
+ spin_lock(&pmbp->lock);
pmbp->link = pmbe;
+ 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--;
+
+ spin_unlock_irqrestore(&pmbe->lock, flags);
}
- if (size >= 0x1000000)
+ if (size >= SZ_16M)
goto again;
return wanted - size;
+
+out:
+ pmb_unmap_entry(pmbp, NR_PMB_ENTRIES);
+
+ return err;
}
void pmb_unmap(unsigned long addr)
{
- struct pmb_entry **p, *pmbe;
+ struct pmb_entry *pmbe = NULL;
+ int i;
- for (p = &pmb_list; (pmbe = *p); p = &pmbe->next)
- if (pmbe->vpn == addr)
- break;
+ read_lock(&pmb_rwlock);
- if (unlikely(!pmbe))
- return;
+ for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
+ if (test_bit(i, pmb_map)) {
+ pmbe = &pmb_entry_list[i];
+ if (pmbe->vpn == addr)
+ break;
+ }
+ }
+
+ read_unlock(&pmb_rwlock);
+
+ pmb_unmap_entry(pmbe, NR_PMB_ENTRIES);
+}
- WARN_ON(!test_bit(pmbe->entry, &pmb_map));
+static 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_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 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 void __pmb_unmap_entry(struct pmb_entry *pmbe, int depth)
+{
do {
struct pmb_entry *pmblink = pmbe;
- clear_pmb_entry(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);
+
pmbe = pmblink->link;
pmb_free(pmblink);
- } while (pmbe);
+ } 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 pmb_cache_ctor(void *pmb, kmem_cache_t *cachep, unsigned long flags)
+static __always_inline unsigned int pmb_ppn_in_range(unsigned long ppn)
{
- struct pmb_entry *pmbe = pmb;
+ return ppn >= __pa(memory_start) && ppn < __pa(memory_end);
+}
+
+static void __init pmb_notify(void)
+{
+ int i;
- memset(pmb, 0, sizeof(struct pmb_entry));
+ pr_info("PMB: boot mappings:\n");
- spin_lock_irq(&pmb_list_lock);
+ 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->entry = PMB_NO_ENTRY;
- pmb_list_add(pmbe);
+ pmbe = &pmb_entry_list[i];
- spin_unlock_irq(&pmb_list_lock);
+ pr_info(" 0x%08lx -> 0x%08lx [ %4ldMB %2scached ]\n",
+ pmbe->vpn >> PAGE_SHIFT, pmbe->ppn >> PAGE_SHIFT,
+ pmbe->size >> 20, (pmbe->flags & PMB_C) ? "" : "un");
+ }
+
+ read_unlock(&pmb_rwlock);
}
-static void pmb_cache_dtor(void *pmb, kmem_cache_t *cachep, unsigned long flags)
+/*
+ * 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)
{
- spin_lock_irq(&pmb_list_lock);
- pmb_list_del(pmb);
- spin_unlock_irq(&pmb_list_lock);
+ 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;
+ }
+
+ 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) {
+ spin_lock(&pmbp->lock);
+
+ /*
+ * 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;
+
+ spin_unlock(&pmbp->lock);
+ }
+
+ pmbp = pmbe;
+
+ spin_unlock_irqrestore(&pmbe->lock, irqflags);
+ }
}
-static int __init pmb_init(void)
+static void __init pmb_merge(struct pmb_entry *head)
{
- unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
- unsigned int entry;
+ unsigned long span, newsize;
+ struct pmb_entry *tail;
+ int i = 1, depth = 0;
- BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
+ span = newsize = head->size;
- pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry),
- 0, 0, pmb_cache_ctor, pmb_cache_dtor);
- BUG_ON(!pmb_cache);
+ tail = head->link;
+ while (tail) {
+ span += tail->size;
- jump_to_P2();
+ if (pmb_size_valid(span)) {
+ newsize = span;
+ depth = i;
+ }
+
+ /* This is the end of the line.. */
+ if (!tail->link)
+ break;
+
+ tail = tail->link;
+ i++;
+ }
/*
- * 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.
+ * The merged page size must be valid.
*/
- for (entry = 0; entry < nr_entries; entry++) {
- struct pmb_entry *pmbe = pmb_init_map + entry;
+ if (!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];
- __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
+ /*
+ * 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);
}
- ctrl_outl(0, PMB_IRMCR);
+ write_unlock_irqrestore(&pmb_rwlock, flags);
+}
- /* PMB.SE and UB[7] */
- ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR);
+#ifdef CONFIG_UNCACHED_MAPPING
+static void __init pmb_resize(void)
+{
+ int i;
- back_to_P1();
+ /*
+ * If the uncached mapping was constructed by the kernel, it will
+ * already be a reasonable size.
+ */
+ if (uncached_size == SZ_16M)
+ return;
- return 0;
+ 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.
+ */
+ 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);
+
+ spin_unlock_irqrestore(&pmbe->lock, flags);
+ }
+
+ read_lock(&pmb_rwlock);
+}
+#endif
+
+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 */
+ __raw_writel(__raw_readl(MMUCR) | MMUCR_TI, MMUCR);
+ ctrl_barrier();
+}
+
+bool __in_29bit_mode(void)
+{
+ return (__raw_readl(PMB_PASCR) & PASCR_SE) == 0;
}
-arch_initcall(pmb_init);
static int pmb_seq_show(struct seq_file *file, void *iter)
{
unsigned int size;
char *sz_str = NULL;
- addr = ctrl_inl(mk_pmb_addr(i));
- data = ctrl_inl(mk_pmb_data(i));
+ 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":
return single_open(file, pmb_seq_show, NULL);
}
-static struct file_operations pmb_debugfs_fops = {
+static const struct file_operations pmb_debugfs_fops = {
.owner = THIS_MODULE,
.open = pmb_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release,
+ .release = single_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);
+ sh_debugfs_root, NULL, &pmb_debugfs_fops);
+ if (!dentry)
+ return -ENOMEM;
if (IS_ERR(dentry))
return PTR_ERR(dentry);
return 0;
}
postcore_initcall(pmb_debugfs_init);
+
+#ifdef CONFIG_PM
+static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state)
+{
+ static pm_message_t prev_state;
+ int i;
+
+ /* Restore the PMB after a resume from hibernation */
+ if (state.event == PM_EVENT_ON &&
+ prev_state.event == PM_EVENT_FREEZE) {
+ struct pmb_entry *pmbe;
+
+ 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);
+ }
+
+ prev_state = state;
+
+ return 0;
+}
+
+static int pmb_sysdev_resume(struct sys_device *dev)
+{
+ return pmb_sysdev_suspend(dev, PMSG_ON);
+}
+
+static struct sysdev_driver pmb_sysdev_driver = {
+ .suspend = pmb_sysdev_suspend,
+ .resume = pmb_sysdev_resume,
+};
+
+static int __init pmb_sysdev_init(void)
+{
+ return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver);
+}
+subsys_initcall(pmb_sysdev_init);
+#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff