1 files changed, 134 insertions, 134 deletions

diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index aade31102112..280f6a166035 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -35,29 +35,9 @@
 
 static void __pmb_unmap(struct pmb_entry *);
 
-static struct kmem_cache *pmb_cache;
+static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
 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;
@@ -73,81 +53,68 @@ 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)
+static int pmb_alloc_entry(void)
 {
-        struct pmb_entry **p, *tmp;
+        unsigned int pos;
 
-        p = &pmb_list;
-        while ((tmp = *p) != NULL)
-                p = &tmp->next;
+repeat:
+        pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
 
-        pmbe->next = tmp;
-        *p = pmbe;
-}
+        if (unlikely(pos > NR_PMB_ENTRIES))
+                return -ENOSPC;
 
-static inline void pmb_list_del(struct pmb_entry *pmbe)
-{
-        struct pmb_entry **p, *tmp;
+        if (test_and_set_bit(pos, &pmb_map))
+                goto repeat;
 
-        for (p = &pmb_list; (tmp = *p); p = &tmp->next)
-                if (tmp == pmbe) {
-                        *p = tmp->next;
-                        return;
-                }
+        return pos;
 }
 
-struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
-                            unsigned long flags)
+static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
+                                   unsigned long flags, int entry)
 {
         struct pmb_entry *pmbe;
+        int pos;
+
+        if (entry == PMB_NO_ENTRY) {
+                pos = pmb_alloc_entry();
+                if (pos < 0)
+                        return ERR_PTR(pos);
+        } else {
+                if (test_bit(entry, &pmb_map))
+                        return ERR_PTR(-ENOSPC);
+                pos = entry;
+        }
 
-        pmbe = kmem_cache_alloc(pmb_cache, GFP_KERNEL);
+        pmbe = &pmb_entry_list[pos];
         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);
+        pmbe->entry     = pos;
 
         return pmbe;
 }
 
-void pmb_free(struct pmb_entry *pmbe)
+static void pmb_free(struct pmb_entry *pmbe)
 {
-        spin_lock_irq(&pmb_list_lock);
-        pmb_list_del(pmbe);
-        spin_unlock_irq(&pmb_list_lock);
+        int pos = pmbe->entry;
 
-        kmem_cache_free(pmb_cache, pmbe);
+        pmbe->vpn       = 0;
+        pmbe->ppn       = 0;
+        pmbe->flags     = 0;
+        pmbe->entry     = 0;
+
+        clear_bit(pos, &pmb_map);
 }
 
 /*
  * Must be in P2 for __set_pmb_entry()
  */
-int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
-                    unsigned long flags, int *entry)
+static void __set_pmb_entry(unsigned long vpn, unsigned long ppn,
+                            unsigned long flags, int pos)
 {
-        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_CACHE_WRITETHROUGH
@@ -161,35 +128,21 @@ repeat:
 #endif
 
         ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));
-
-        *entry = pos;
-
-        return 0;
 }
 
-int __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe)
+static void __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe)
 {
-        int ret;
-
         jump_to_uncached();
-        ret = __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &pmbe->entry);
+        __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, pmbe->entry);
         back_to_cached();
-
-        return ret;
 }
 
-void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe)
+static void __uses_jump_to_uncached 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))
+        if (unlikely(entry >= NR_PMB_ENTRIES))
                 return;
 
         jump_to_uncached();
@@ -202,8 +155,6 @@ void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe)
         ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
 
         back_to_cached();
-
-        clear_bit(entry, &pmb_map);
 }
 
 
@@ -239,23 +190,17 @@ long pmb_remap(unsigned long vaddr, unsigned long phys,
 
 again:
         for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
-                int ret;
-
                 if (size < pmb_sizes[i].size)
                         continue;
 
-                pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag);
+                pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag,
+                                 PMB_NO_ENTRY);
                 if (IS_ERR(pmbe)) {
                         err = PTR_ERR(pmbe);
                         goto out;
                 }
 
-                ret = set_pmb_entry(pmbe);
-                if (ret != 0) {
-                        pmb_free(pmbe);
-                        err = -EBUSY;
-                        goto out;
-                }
+                set_pmb_entry(pmbe);
 
                 phys    += pmb_sizes[i].size;
                 vaddr   += pmb_sizes[i].size;
@@ -292,11 +237,16 @@ out:
 
 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;
+        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;
+                }
+        }
 
         if (unlikely(!pmbe))
                 return;
@@ -306,13 +256,22 @@ void pmb_unmap(unsigned long addr)
 
 static void __pmb_unmap(struct pmb_entry *pmbe)
 {
-        WARN_ON(!test_bit(pmbe->entry, &pmb_map));
+        BUG_ON(!test_bit(pmbe->entry, &pmb_map));
 
         do {
                 struct pmb_entry *pmblink = pmbe;
 
-                if (pmbe->entry != PMB_NO_ENTRY)
-                        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;
 
@@ -320,42 +279,34 @@ static void __pmb_unmap(struct pmb_entry *pmbe)
         } while (pmbe);
 }
 
-static void pmb_cache_ctor(void *pmb)
+#ifdef CONFIG_PMB
+int __uses_jump_to_uncached pmb_init(void)
 {
-        struct pmb_entry *pmbe = pmb;
-
-        memset(pmb, 0, sizeof(struct pmb_entry));
-
-        pmbe->entry = PMB_NO_ENTRY;
-}
-
-static int __uses_jump_to_uncached pmb_init(void)
-{
-        unsigned int nr_entries = ARRAY_SIZE(pmb_init_map);
-        unsigned int entry, i;
-
-        BUG_ON(unlikely(nr_entries >= NR_PMB_ENTRIES));
-
-        pmb_cache = kmem_cache_create("pmb", sizeof(struct pmb_entry), 0,
-                                      SLAB_PANIC, pmb_cache_ctor);
+        unsigned int i;
+        long size, ret;
 
         jump_to_uncached();
 
         /*
-         * 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.
+         * Insert PMB entries for the P1 and P2 areas so that, after
+         * we've switched the MMU to 32-bit mode, the semantics of P1
+         * and P2 are the same as in 29-bit mode, e.g.
+         *
+         *      P1 - provides a cached window onto physical memory
+         *      P2 - provides an uncached window onto physical memory
          */
-        for (entry = 0; entry < nr_entries; entry++) {
-                struct pmb_entry *pmbe = pmb_init_map + entry;
+        size = __MEMORY_START + __MEMORY_SIZE;
 
-                __set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, &entry);
-        }
+        ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
+        BUG_ON(ret != size);
+
+        ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
+        BUG_ON(ret != size);
 
         ctrl_outl(0, PMB_IRMCR);
 
         /* PMB.SE and UB[7] */
-        ctrl_outl((1 << 31) | (1 << 7), PMB_PASCR);
+        ctrl_outl(PASCR_SE | (1 << 7), PMB_PASCR);
 
         /* Flush out the TLB */
         i =  ctrl_inl(MMUCR);
@@ -366,7 +317,53 @@ static int __uses_jump_to_uncached pmb_init(void)
 
         return 0;
 }
-arch_initcall(pmb_init);
+#else
+int __uses_jump_to_uncached pmb_init(void)
+{
+        int i;
+        unsigned long addr, data;
+
+        jump_to_uncached();
+
+        for (i = 0; i < PMB_ENTRY_MAX; i++) {
+                struct pmb_entry *pmbe;
+                unsigned long vpn, ppn, flags;
+
+                addr = PMB_DATA + (i << PMB_E_SHIFT);
+                data = ctrl_inl(addr);
+                if (!(data & PMB_V))
+                        continue;
+
+                if (data & PMB_C) {
+#if defined(CONFIG_CACHE_WRITETHROUGH)
+                        data |= PMB_WT;
+#elif defined(CONFIG_CACHE_WRITEBACK)
+                        data &= ~PMB_WT;
+#else
+                        data &= ~(PMB_C | PMB_WT);
+#endif
+                }
+                ctrl_outl(data, addr);
+
+                ppn = data & PMB_PFN_MASK;
+
+                flags = data & (PMB_C | PMB_WT | PMB_UB);
+                flags |= data & PMB_SZ_MASK;
+
+                addr = PMB_ADDR + (i << PMB_E_SHIFT);
+                data = ctrl_inl(addr);
+
+                vpn = data & PMB_PFN_MASK;
+
+                pmbe = pmb_alloc(vpn, ppn, flags, i);
+                WARN_ON(IS_ERR(pmbe));
+        }
+
+        back_to_cached();
+
+        return 0;
+}
+#endif /* CONFIG_PMB */
 
 static int pmb_seq_show(struct seq_file *file, void *iter)
 {
@@ -434,15 +431,18 @@ postcore_initcall(pmb_debugfs_init);
 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;
-                spin_lock_irq(&pmb_list_lock);
-                for (pmbe = pmb_list; pmbe; pmbe = pmbe->next)
-                        set_pmb_entry(pmbe);
-                spin_unlock_irq(&pmb_list_lock);
+                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);
+                        }
+                }
         }
         prev_state = state;
         return 0;