468 lines
9.5 KiB
C
468 lines
9.5 KiB
C
/*
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* arch/sh/mm/pmb.c
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*
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* Privileged Space Mapping Buffer (PMB) Support.
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*
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* Copyright (C) 2005, 2006, 2007 Paul Mundt
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*
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* P1/P2 Section mapping definitions from map32.h, which was:
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*
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* Copyright 2003 (c) Lineo Solutions,Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/err.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/io.h>
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#include <asm/mmu_context.h>
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#define NR_PMB_ENTRIES 16
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static void __pmb_unmap(struct pmb_entry *);
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static struct pmb_entry pmb_entry_list[NR_PMB_ENTRIES];
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static unsigned long pmb_map;
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static inline unsigned long mk_pmb_entry(unsigned int entry)
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{
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return (entry & PMB_E_MASK) << PMB_E_SHIFT;
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}
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static inline unsigned long mk_pmb_addr(unsigned int entry)
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{
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return mk_pmb_entry(entry) | PMB_ADDR;
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}
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static inline unsigned long mk_pmb_data(unsigned int entry)
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{
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return mk_pmb_entry(entry) | PMB_DATA;
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}
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static int pmb_alloc_entry(void)
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{
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unsigned int pos;
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repeat:
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pos = find_first_zero_bit(&pmb_map, NR_PMB_ENTRIES);
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if (unlikely(pos > NR_PMB_ENTRIES))
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return -ENOSPC;
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if (test_and_set_bit(pos, &pmb_map))
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goto repeat;
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return pos;
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}
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static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
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unsigned long flags, int entry)
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{
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struct pmb_entry *pmbe;
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int pos;
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if (entry == PMB_NO_ENTRY) {
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pos = pmb_alloc_entry();
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if (pos < 0)
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return ERR_PTR(pos);
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} else {
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if (test_bit(entry, &pmb_map))
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return ERR_PTR(-ENOSPC);
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pos = entry;
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}
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pmbe = &pmb_entry_list[pos];
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if (!pmbe)
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return ERR_PTR(-ENOMEM);
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pmbe->vpn = vpn;
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pmbe->ppn = ppn;
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pmbe->flags = flags;
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pmbe->entry = pos;
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return pmbe;
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}
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static void pmb_free(struct pmb_entry *pmbe)
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{
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int pos = pmbe->entry;
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pmbe->vpn = 0;
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pmbe->ppn = 0;
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pmbe->flags = 0;
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pmbe->entry = 0;
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clear_bit(pos, &pmb_map);
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}
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/*
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* Must be in P2 for __set_pmb_entry()
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*/
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static void __set_pmb_entry(unsigned long vpn, unsigned long ppn,
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unsigned long flags, int pos)
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{
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ctrl_outl(vpn | PMB_V, mk_pmb_addr(pos));
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#ifdef CONFIG_CACHE_WRITETHROUGH
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/*
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* When we are in 32-bit address extended mode, CCR.CB becomes
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* invalid, so care must be taken to manually adjust cacheable
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* translations.
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*/
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if (likely(flags & PMB_C))
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flags |= PMB_WT;
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#endif
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ctrl_outl(ppn | flags | PMB_V, mk_pmb_data(pos));
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}
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static void __uses_jump_to_uncached set_pmb_entry(struct pmb_entry *pmbe)
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{
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jump_to_uncached();
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__set_pmb_entry(pmbe->vpn, pmbe->ppn, pmbe->flags, pmbe->entry);
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back_to_cached();
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}
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static void __uses_jump_to_uncached clear_pmb_entry(struct pmb_entry *pmbe)
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{
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unsigned int entry = pmbe->entry;
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unsigned long addr;
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if (unlikely(entry >= NR_PMB_ENTRIES))
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return;
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jump_to_uncached();
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/* Clear V-bit */
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addr = mk_pmb_addr(entry);
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ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
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addr = mk_pmb_data(entry);
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ctrl_outl(ctrl_inl(addr) & ~PMB_V, addr);
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back_to_cached();
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}
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static struct {
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unsigned long size;
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int flag;
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} pmb_sizes[] = {
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{ .size = 0x20000000, .flag = PMB_SZ_512M, },
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{ .size = 0x08000000, .flag = PMB_SZ_128M, },
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{ .size = 0x04000000, .flag = PMB_SZ_64M, },
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{ .size = 0x01000000, .flag = PMB_SZ_16M, },
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};
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long pmb_remap(unsigned long vaddr, unsigned long phys,
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unsigned long size, unsigned long flags)
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{
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struct pmb_entry *pmbp, *pmbe;
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unsigned long wanted;
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int pmb_flags, i;
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long err;
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/* Convert typical pgprot value to the PMB equivalent */
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if (flags & _PAGE_CACHABLE) {
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if (flags & _PAGE_WT)
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pmb_flags = PMB_WT;
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else
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pmb_flags = PMB_C;
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} else
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pmb_flags = PMB_WT | PMB_UB;
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pmbp = NULL;
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wanted = size;
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again:
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for (i = 0; i < ARRAY_SIZE(pmb_sizes); i++) {
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if (size < pmb_sizes[i].size)
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continue;
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pmbe = pmb_alloc(vaddr, phys, pmb_flags | pmb_sizes[i].flag,
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PMB_NO_ENTRY);
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if (IS_ERR(pmbe)) {
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err = PTR_ERR(pmbe);
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goto out;
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}
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set_pmb_entry(pmbe);
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phys += pmb_sizes[i].size;
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vaddr += pmb_sizes[i].size;
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size -= pmb_sizes[i].size;
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/*
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* Link adjacent entries that span multiple PMB entries
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* for easier tear-down.
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*/
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if (likely(pmbp))
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pmbp->link = pmbe;
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pmbp = pmbe;
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/*
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* Instead of trying smaller sizes on every iteration
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* (even if we succeed in allocating space), try using
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* pmb_sizes[i].size again.
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*/
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i--;
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}
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if (size >= 0x1000000)
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goto again;
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return wanted - size;
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out:
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if (pmbp)
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__pmb_unmap(pmbp);
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return err;
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}
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void pmb_unmap(unsigned long addr)
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{
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struct pmb_entry *pmbe = NULL;
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int i;
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for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
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if (test_bit(i, &pmb_map)) {
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pmbe = &pmb_entry_list[i];
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if (pmbe->vpn == addr)
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break;
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}
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}
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if (unlikely(!pmbe))
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return;
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__pmb_unmap(pmbe);
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}
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static void __pmb_unmap(struct pmb_entry *pmbe)
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{
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BUG_ON(!test_bit(pmbe->entry, &pmb_map));
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do {
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struct pmb_entry *pmblink = pmbe;
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/*
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* We may be called before this pmb_entry has been
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* entered into the PMB table via set_pmb_entry(), but
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* that's OK because we've allocated a unique slot for
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* this entry in pmb_alloc() (even if we haven't filled
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* it yet).
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*
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* Therefore, calling clear_pmb_entry() is safe as no
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* other mapping can be using that slot.
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*/
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clear_pmb_entry(pmbe);
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pmbe = pmblink->link;
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pmb_free(pmblink);
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} while (pmbe);
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}
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#ifdef CONFIG_PMB
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int __uses_jump_to_uncached pmb_init(void)
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{
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unsigned int i;
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long size, ret;
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jump_to_uncached();
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/*
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* Insert PMB entries for the P1 and P2 areas so that, after
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* we've switched the MMU to 32-bit mode, the semantics of P1
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* and P2 are the same as in 29-bit mode, e.g.
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*
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* P1 - provides a cached window onto physical memory
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* P2 - provides an uncached window onto physical memory
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*/
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size = __MEMORY_START + __MEMORY_SIZE;
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ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
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BUG_ON(ret != size);
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ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
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BUG_ON(ret != size);
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ctrl_outl(0, PMB_IRMCR);
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/* PMB.SE and UB[7] */
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ctrl_outl(PASCR_SE | (1 << 7), PMB_PASCR);
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/* Flush out the TLB */
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i = ctrl_inl(MMUCR);
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i |= MMUCR_TI;
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ctrl_outl(i, MMUCR);
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back_to_cached();
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return 0;
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}
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#else
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int __uses_jump_to_uncached pmb_init(void)
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{
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int i;
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unsigned long addr, data;
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jump_to_uncached();
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for (i = 0; i < PMB_ENTRY_MAX; i++) {
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struct pmb_entry *pmbe;
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unsigned long vpn, ppn, flags;
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addr = PMB_DATA + (i << PMB_E_SHIFT);
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data = ctrl_inl(addr);
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if (!(data & PMB_V))
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continue;
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if (data & PMB_C) {
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#if defined(CONFIG_CACHE_WRITETHROUGH)
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data |= PMB_WT;
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#elif defined(CONFIG_CACHE_WRITEBACK)
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data &= ~PMB_WT;
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#else
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data &= ~(PMB_C | PMB_WT);
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#endif
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}
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ctrl_outl(data, addr);
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ppn = data & PMB_PFN_MASK;
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flags = data & (PMB_C | PMB_WT | PMB_UB);
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flags |= data & PMB_SZ_MASK;
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addr = PMB_ADDR + (i << PMB_E_SHIFT);
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data = ctrl_inl(addr);
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vpn = data & PMB_PFN_MASK;
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pmbe = pmb_alloc(vpn, ppn, flags, i);
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WARN_ON(IS_ERR(pmbe));
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}
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back_to_cached();
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return 0;
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}
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#endif /* CONFIG_PMB */
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static int pmb_seq_show(struct seq_file *file, void *iter)
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{
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int i;
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seq_printf(file, "V: Valid, C: Cacheable, WT: Write-Through\n"
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"CB: Copy-Back, B: Buffered, UB: Unbuffered\n");
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seq_printf(file, "ety vpn ppn size flags\n");
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for (i = 0; i < NR_PMB_ENTRIES; i++) {
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unsigned long addr, data;
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unsigned int size;
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char *sz_str = NULL;
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addr = ctrl_inl(mk_pmb_addr(i));
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data = ctrl_inl(mk_pmb_data(i));
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size = data & PMB_SZ_MASK;
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sz_str = (size == PMB_SZ_16M) ? " 16MB":
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(size == PMB_SZ_64M) ? " 64MB":
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(size == PMB_SZ_128M) ? "128MB":
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"512MB";
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/* 02: V 0x88 0x08 128MB C CB B */
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seq_printf(file, "%02d: %c 0x%02lx 0x%02lx %s %c %s %s\n",
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i, ((addr & PMB_V) && (data & PMB_V)) ? 'V' : ' ',
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(addr >> 24) & 0xff, (data >> 24) & 0xff,
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sz_str, (data & PMB_C) ? 'C' : ' ',
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(data & PMB_WT) ? "WT" : "CB",
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(data & PMB_UB) ? "UB" : " B");
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}
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return 0;
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}
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static int pmb_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, pmb_seq_show, NULL);
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}
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static const struct file_operations pmb_debugfs_fops = {
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.owner = THIS_MODULE,
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.open = pmb_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init pmb_debugfs_init(void)
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{
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struct dentry *dentry;
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dentry = debugfs_create_file("pmb", S_IFREG | S_IRUGO,
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sh_debugfs_root, NULL, &pmb_debugfs_fops);
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if (!dentry)
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return -ENOMEM;
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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return 0;
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}
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postcore_initcall(pmb_debugfs_init);
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#ifdef CONFIG_PM
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static int pmb_sysdev_suspend(struct sys_device *dev, pm_message_t state)
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{
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static pm_message_t prev_state;
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int i;
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/* Restore the PMB after a resume from hibernation */
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if (state.event == PM_EVENT_ON &&
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prev_state.event == PM_EVENT_FREEZE) {
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struct pmb_entry *pmbe;
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for (i = 0; i < ARRAY_SIZE(pmb_entry_list); i++) {
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if (test_bit(i, &pmb_map)) {
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pmbe = &pmb_entry_list[i];
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set_pmb_entry(pmbe);
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}
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}
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}
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prev_state = state;
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return 0;
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}
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static int pmb_sysdev_resume(struct sys_device *dev)
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{
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return pmb_sysdev_suspend(dev, PMSG_ON);
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}
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static struct sysdev_driver pmb_sysdev_driver = {
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.suspend = pmb_sysdev_suspend,
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.resume = pmb_sysdev_resume,
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};
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static int __init pmb_sysdev_init(void)
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{
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return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver);
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}
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subsys_initcall(pmb_sysdev_init);
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#endif
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