65f1f5a2c3
This may have made sense on a paranoid day with pass 1 BCM1250 processors
that were throwing cache error exception left and right for no good
reason. On modern silicion that hardly makes sense and the code had
gotten just an obscurity ...
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
556 lines
14 KiB
C
556 lines
14 KiB
C
/*
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* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
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* Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org)
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* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
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* Copyright (C) 2004 Maciej W. Rozycki
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <asm/asm.h>
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#include <asm/bootinfo.h>
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#include <asm/cacheops.h>
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#include <asm/cpu.h>
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#include <asm/mipsregs.h>
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#include <asm/mmu_context.h>
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#include <asm/uaccess.h>
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extern void sb1_dma_init(void);
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/* These are probed at ld_mmu time */
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static unsigned long icache_size;
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static unsigned long dcache_size;
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static unsigned short icache_line_size;
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static unsigned short dcache_line_size;
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static unsigned int icache_index_mask;
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static unsigned int dcache_index_mask;
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static unsigned short icache_assoc;
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static unsigned short dcache_assoc;
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static unsigned short icache_sets;
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static unsigned short dcache_sets;
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static unsigned int icache_range_cutoff;
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static unsigned int dcache_range_cutoff;
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/*
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* The dcache is fully coherent to the system, with one
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* big caveat: the instruction stream. In other words,
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* if we miss in the icache, and have dirty data in the
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* L1 dcache, then we'll go out to memory (or the L2) and
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* get the not-as-recent data.
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*
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* So the only time we have to flush the dcache is when
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* we're flushing the icache. Since the L2 is fully
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* coherent to everything, including I/O, we never have
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* to flush it
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*/
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#define cache_set_op(op, addr) \
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__asm__ __volatile__( \
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" .set noreorder \n" \
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" .set mips64\n\t \n" \
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" cache %0, (0<<13)(%1) \n" \
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" cache %0, (1<<13)(%1) \n" \
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" cache %0, (2<<13)(%1) \n" \
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" cache %0, (3<<13)(%1) \n" \
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" .set mips0 \n" \
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" .set reorder" \
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: \
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: "i" (op), "r" (addr))
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#define sync() \
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__asm__ __volatile( \
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" .set mips64\n\t \n" \
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" sync \n" \
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" .set mips0")
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#define mispredict() \
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__asm__ __volatile__( \
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" bnezl $0, 1f \n" /* Force mispredict */ \
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"1: \n");
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/*
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* Writeback and invalidate the entire dcache
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*/
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static inline void __sb1_writeback_inv_dcache_all(void)
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{
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unsigned long addr = 0;
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while (addr < dcache_line_size * dcache_sets) {
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cache_set_op(Index_Writeback_Inv_D, addr);
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addr += dcache_line_size;
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}
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}
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/*
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* Writeback and invalidate a range of the dcache. The addresses are
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* virtual, and since we're using index ops and bit 12 is part of both
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* the virtual frame and physical index, we have to clear both sets
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* (bit 12 set and cleared).
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*/
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static inline void __sb1_writeback_inv_dcache_range(unsigned long start,
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unsigned long end)
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{
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unsigned long index;
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start &= ~(dcache_line_size - 1);
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end = (end + dcache_line_size - 1) & ~(dcache_line_size - 1);
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while (start != end) {
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index = start & dcache_index_mask;
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cache_set_op(Index_Writeback_Inv_D, index);
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cache_set_op(Index_Writeback_Inv_D, index ^ (1<<12));
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start += dcache_line_size;
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}
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sync();
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}
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/*
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* Writeback and invalidate a range of the dcache. With physical
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* addresseses, we don't have to worry about possible bit 12 aliasing.
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* XXXKW is it worth turning on KX and using hit ops with xkphys?
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*/
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static inline void __sb1_writeback_inv_dcache_phys_range(unsigned long start,
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unsigned long end)
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{
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start &= ~(dcache_line_size - 1);
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end = (end + dcache_line_size - 1) & ~(dcache_line_size - 1);
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while (start != end) {
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cache_set_op(Index_Writeback_Inv_D, start & dcache_index_mask);
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start += dcache_line_size;
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}
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sync();
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}
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/*
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* Invalidate the entire icache
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*/
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static inline void __sb1_flush_icache_all(void)
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{
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unsigned long addr = 0;
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while (addr < icache_line_size * icache_sets) {
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cache_set_op(Index_Invalidate_I, addr);
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addr += icache_line_size;
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}
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}
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/*
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* Flush the icache for a given physical page. Need to writeback the
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* dcache first, then invalidate the icache. If the page isn't
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* executable, nothing is required.
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*/
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static void local_sb1_flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn)
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{
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int cpu = smp_processor_id();
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#ifndef CONFIG_SMP
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if (!(vma->vm_flags & VM_EXEC))
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return;
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#endif
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__sb1_writeback_inv_dcache_range(addr, addr + PAGE_SIZE);
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/*
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* Bumping the ASID is probably cheaper than the flush ...
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*/
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if (cpu_context(cpu, vma->vm_mm) != 0)
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drop_mmu_context(vma->vm_mm, cpu);
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}
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#ifdef CONFIG_SMP
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struct flush_cache_page_args {
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struct vm_area_struct *vma;
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unsigned long addr;
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unsigned long pfn;
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};
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static void sb1_flush_cache_page_ipi(void *info)
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{
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struct flush_cache_page_args *args = info;
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local_sb1_flush_cache_page(args->vma, args->addr, args->pfn);
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}
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/* Dirty dcache could be on another CPU, so do the IPIs */
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static void sb1_flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn)
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{
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struct flush_cache_page_args args;
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if (!(vma->vm_flags & VM_EXEC))
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return;
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addr &= PAGE_MASK;
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args.vma = vma;
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args.addr = addr;
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args.pfn = pfn;
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on_each_cpu(sb1_flush_cache_page_ipi, (void *) &args, 1, 1);
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}
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#else
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void sb1_flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn)
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__attribute__((alias("local_sb1_flush_cache_page")));
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#endif
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/*
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* Invalidate a range of the icache. The addresses are virtual, and
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* the cache is virtually indexed and tagged. However, we don't
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* necessarily have the right ASID context, so use index ops instead
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* of hit ops.
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*/
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static inline void __sb1_flush_icache_range(unsigned long start,
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unsigned long end)
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{
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start &= ~(icache_line_size - 1);
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end = (end + icache_line_size - 1) & ~(icache_line_size - 1);
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while (start != end) {
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cache_set_op(Index_Invalidate_I, start & icache_index_mask);
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start += icache_line_size;
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}
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mispredict();
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sync();
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}
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/*
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* Invalidate all caches on this CPU
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*/
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static void __attribute_used__ local_sb1___flush_cache_all(void)
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{
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__sb1_writeback_inv_dcache_all();
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__sb1_flush_icache_all();
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}
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#ifdef CONFIG_SMP
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void sb1___flush_cache_all_ipi(void *ignored)
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__attribute__((alias("local_sb1___flush_cache_all")));
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static void sb1___flush_cache_all(void)
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{
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on_each_cpu(sb1___flush_cache_all_ipi, 0, 1, 1);
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}
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#else
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void sb1___flush_cache_all(void)
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__attribute__((alias("local_sb1___flush_cache_all")));
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#endif
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/*
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* When flushing a range in the icache, we have to first writeback
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* the dcache for the same range, so new ifetches will see any
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* data that was dirty in the dcache.
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*
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* The start/end arguments are Kseg addresses (possibly mapped Kseg).
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*/
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static void local_sb1_flush_icache_range(unsigned long start,
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unsigned long end)
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{
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/* Just wb-inv the whole dcache if the range is big enough */
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if ((end - start) > dcache_range_cutoff)
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__sb1_writeback_inv_dcache_all();
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else
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__sb1_writeback_inv_dcache_range(start, end);
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/* Just flush the whole icache if the range is big enough */
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if ((end - start) > icache_range_cutoff)
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__sb1_flush_icache_all();
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else
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__sb1_flush_icache_range(start, end);
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}
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#ifdef CONFIG_SMP
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struct flush_icache_range_args {
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unsigned long start;
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unsigned long end;
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};
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static void sb1_flush_icache_range_ipi(void *info)
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{
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struct flush_icache_range_args *args = info;
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local_sb1_flush_icache_range(args->start, args->end);
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}
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void sb1_flush_icache_range(unsigned long start, unsigned long end)
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{
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struct flush_icache_range_args args;
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args.start = start;
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args.end = end;
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on_each_cpu(sb1_flush_icache_range_ipi, &args, 1, 1);
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}
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#else
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void sb1_flush_icache_range(unsigned long start, unsigned long end)
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__attribute__((alias("local_sb1_flush_icache_range")));
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#endif
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/*
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* Flush the icache for a given physical page. Need to writeback the
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* dcache first, then invalidate the icache. If the page isn't
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* executable, nothing is required.
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*/
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static void local_sb1_flush_icache_page(struct vm_area_struct *vma,
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struct page *page)
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{
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unsigned long start;
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int cpu = smp_processor_id();
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#ifndef CONFIG_SMP
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if (!(vma->vm_flags & VM_EXEC))
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return;
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#endif
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/* Need to writeback any dirty data for that page, we have the PA */
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start = (unsigned long)(page-mem_map) << PAGE_SHIFT;
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__sb1_writeback_inv_dcache_phys_range(start, start + PAGE_SIZE);
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/*
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* If there's a context, bump the ASID (cheaper than a flush,
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* since we don't know VAs!)
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*/
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if (cpu_context(cpu, vma->vm_mm) != 0) {
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drop_mmu_context(vma->vm_mm, cpu);
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}
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}
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#ifdef CONFIG_SMP
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struct flush_icache_page_args {
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struct vm_area_struct *vma;
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struct page *page;
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};
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static void sb1_flush_icache_page_ipi(void *info)
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{
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struct flush_icache_page_args *args = info;
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local_sb1_flush_icache_page(args->vma, args->page);
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}
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/* Dirty dcache could be on another CPU, so do the IPIs */
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static void sb1_flush_icache_page(struct vm_area_struct *vma,
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struct page *page)
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{
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struct flush_icache_page_args args;
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if (!(vma->vm_flags & VM_EXEC))
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return;
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args.vma = vma;
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args.page = page;
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on_each_cpu(sb1_flush_icache_page_ipi, (void *) &args, 1, 1);
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}
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#else
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void sb1_flush_icache_page(struct vm_area_struct *vma, struct page *page)
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__attribute__((alias("local_sb1_flush_icache_page")));
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#endif
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/*
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* A signal trampoline must fit into a single cacheline.
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*/
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static void local_sb1_flush_cache_sigtramp(unsigned long addr)
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{
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cache_set_op(Index_Writeback_Inv_D, addr & dcache_index_mask);
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cache_set_op(Index_Writeback_Inv_D, (addr ^ (1<<12)) & dcache_index_mask);
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cache_set_op(Index_Invalidate_I, addr & icache_index_mask);
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mispredict();
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}
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#ifdef CONFIG_SMP
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static void sb1_flush_cache_sigtramp_ipi(void *info)
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{
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unsigned long iaddr = (unsigned long) info;
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local_sb1_flush_cache_sigtramp(iaddr);
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}
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static void sb1_flush_cache_sigtramp(unsigned long addr)
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{
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on_each_cpu(sb1_flush_cache_sigtramp_ipi, (void *) addr, 1, 1);
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}
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#else
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void sb1_flush_cache_sigtramp(unsigned long addr)
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__attribute__((alias("local_sb1_flush_cache_sigtramp")));
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#endif
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/*
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* Anything that just flushes dcache state can be ignored, as we're always
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* coherent in dcache space. This is just a dummy function that all the
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* nop'ed routines point to
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*/
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static void sb1_nop(void)
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{
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}
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/*
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* Cache set values (from the mips64 spec)
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* 0 - 64
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* 1 - 128
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* 2 - 256
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* 3 - 512
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* 4 - 1024
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* 5 - 2048
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* 6 - 4096
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* 7 - Reserved
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*/
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static unsigned int decode_cache_sets(unsigned int config_field)
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{
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if (config_field == 7) {
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/* JDCXXX - Find a graceful way to abort. */
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return 0;
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}
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return (1<<(config_field + 6));
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}
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/*
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* Cache line size values (from the mips64 spec)
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* 0 - No cache present.
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* 1 - 4 bytes
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* 2 - 8 bytes
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* 3 - 16 bytes
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* 4 - 32 bytes
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* 5 - 64 bytes
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* 6 - 128 bytes
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* 7 - Reserved
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*/
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static unsigned int decode_cache_line_size(unsigned int config_field)
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{
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if (config_field == 0) {
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return 0;
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} else if (config_field == 7) {
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/* JDCXXX - Find a graceful way to abort. */
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return 0;
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}
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return (1<<(config_field + 1));
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}
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/*
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* Relevant bits of the config1 register format (from the MIPS32/MIPS64 specs)
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*
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* 24:22 Icache sets per way
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* 21:19 Icache line size
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* 18:16 Icache Associativity
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* 15:13 Dcache sets per way
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* 12:10 Dcache line size
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* 9:7 Dcache Associativity
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*/
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static char *way_string[] = {
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"direct mapped", "2-way", "3-way", "4-way",
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"5-way", "6-way", "7-way", "8-way",
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};
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static __init void probe_cache_sizes(void)
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{
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u32 config1;
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config1 = read_c0_config1();
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icache_line_size = decode_cache_line_size((config1 >> 19) & 0x7);
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dcache_line_size = decode_cache_line_size((config1 >> 10) & 0x7);
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icache_sets = decode_cache_sets((config1 >> 22) & 0x7);
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dcache_sets = decode_cache_sets((config1 >> 13) & 0x7);
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icache_assoc = ((config1 >> 16) & 0x7) + 1;
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dcache_assoc = ((config1 >> 7) & 0x7) + 1;
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icache_size = icache_line_size * icache_sets * icache_assoc;
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dcache_size = dcache_line_size * dcache_sets * dcache_assoc;
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/* Need to remove non-index bits for index ops */
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icache_index_mask = (icache_sets - 1) * icache_line_size;
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dcache_index_mask = (dcache_sets - 1) * dcache_line_size;
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/*
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* These are for choosing range (index ops) versus all.
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* icache flushes all ways for each set, so drop icache_assoc.
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* dcache flushes all ways and each setting of bit 12 for each
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* index, so drop dcache_assoc and halve the dcache_sets.
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*/
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icache_range_cutoff = icache_sets * icache_line_size;
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dcache_range_cutoff = (dcache_sets / 2) * icache_line_size;
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printk("Primary instruction cache %ldkB, %s, linesize %d bytes.\n",
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icache_size >> 10, way_string[icache_assoc - 1],
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icache_line_size);
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printk("Primary data cache %ldkB, %s, linesize %d bytes.\n",
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dcache_size >> 10, way_string[dcache_assoc - 1],
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dcache_line_size);
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}
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/*
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* This is called from cache.c. We have to set up all the
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* memory management function pointers, as well as initialize
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* the caches and tlbs
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*/
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void sb1_cache_init(void)
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{
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extern char except_vec2_sb1;
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extern char handle_vec2_sb1;
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/* Special cache error handler for SB1 */
|
|
set_uncached_handler (0x100, &except_vec2_sb1, 0x80);
|
|
|
|
probe_cache_sizes();
|
|
|
|
#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
|
|
sb1_dma_init();
|
|
#endif
|
|
|
|
/*
|
|
* None of these are needed for the SB1 - the Dcache is
|
|
* physically indexed and tagged, so no virtual aliasing can
|
|
* occur
|
|
*/
|
|
flush_cache_range = (void *) sb1_nop;
|
|
flush_cache_mm = (void (*)(struct mm_struct *))sb1_nop;
|
|
flush_cache_all = sb1_nop;
|
|
|
|
/* These routines are for Icache coherence with the Dcache */
|
|
flush_icache_range = sb1_flush_icache_range;
|
|
flush_icache_page = sb1_flush_icache_page;
|
|
flush_icache_all = __sb1_flush_icache_all; /* local only */
|
|
|
|
/* This implies an Icache flush too, so can't be nop'ed */
|
|
flush_cache_page = sb1_flush_cache_page;
|
|
|
|
flush_cache_sigtramp = sb1_flush_cache_sigtramp;
|
|
flush_data_cache_page = (void *) sb1_nop;
|
|
|
|
/* Full flush */
|
|
__flush_cache_all = sb1___flush_cache_all;
|
|
|
|
change_c0_config(CONF_CM_CMASK, CONF_CM_DEFAULT);
|
|
|
|
/*
|
|
* This is the only way to force the update of K0 to complete
|
|
* before subsequent instruction fetch.
|
|
*/
|
|
__asm__ __volatile__(
|
|
".set push \n"
|
|
" .set noat \n"
|
|
" .set noreorder \n"
|
|
" .set mips3 \n"
|
|
" " STR(PTR_LA) " $1, 1f \n"
|
|
" " STR(MTC0) " $1, $14 \n"
|
|
" eret \n"
|
|
"1: .set pop"
|
|
:
|
|
:
|
|
: "memory");
|
|
|
|
flush_cache_all();
|
|
}
|