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Diffstat (limited to 'arch/mips/mm/c-sb1.c')
| -rw-r--r-- | arch/mips/mm/c-sb1.c | 535 |
1 files changed, 0 insertions, 535 deletions
diff --git a/arch/mips/mm/c-sb1.c b/arch/mips/mm/c-sb1.c deleted file mode 100644 index 85ce2842d0d..00000000000 --- a/arch/mips/mm/c-sb1.c +++ /dev/null @@ -1,535 +0,0 @@ -/* - * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) - * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org) - * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation - * Copyright (C) 2004 Maciej W. Rozycki - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ -#include <linux/init.h> -#include <linux/hardirq.h> - -#include <asm/asm.h> -#include <asm/bootinfo.h> -#include <asm/cacheops.h> -#include <asm/cpu.h> -#include <asm/mipsregs.h> -#include <asm/mmu_context.h> -#include <asm/uaccess.h> - -extern void sb1_dma_init(void); - -/* These are probed at ld_mmu time */ -static unsigned long icache_size; -static unsigned long dcache_size; - -static unsigned short icache_line_size; -static unsigned short dcache_line_size; - -static unsigned int icache_index_mask; -static unsigned int dcache_index_mask; - -static unsigned short icache_assoc; -static unsigned short dcache_assoc; - -static unsigned short icache_sets; -static unsigned short dcache_sets; - -static unsigned int icache_range_cutoff; -static unsigned int dcache_range_cutoff; - -static inline void sb1_on_each_cpu(void (*func) (void *info), void *info, - int retry, int wait) -{ - preempt_disable(); - smp_call_function(func, info, retry, wait); - func(info); - preempt_enable(); -} - -/* - * The dcache is fully coherent to the system, with one - * big caveat: the instruction stream. In other words, - * if we miss in the icache, and have dirty data in the - * L1 dcache, then we'll go out to memory (or the L2) and - * get the not-as-recent data. - * - * So the only time we have to flush the dcache is when - * we're flushing the icache. Since the L2 is fully - * coherent to everything, including I/O, we never have - * to flush it - */ - -#define cache_set_op(op, addr) \ - __asm__ __volatile__( \ - " .set noreorder \n" \ - " .set mips64\n\t \n" \ - " cache %0, (0<<13)(%1) \n" \ - " cache %0, (1<<13)(%1) \n" \ - " cache %0, (2<<13)(%1) \n" \ - " cache %0, (3<<13)(%1) \n" \ - " .set mips0 \n" \ - " .set reorder" \ - : \ - : "i" (op), "r" (addr)) - -#define sync() \ - __asm__ __volatile( \ - " .set mips64\n\t \n" \ - " sync \n" \ - " .set mips0") - -#define mispredict() \ - __asm__ __volatile__( \ - " bnezl $0, 1f \n" /* Force mispredict */ \ - "1: \n"); - -/* - * Writeback and invalidate the entire dcache - */ -static inline void __sb1_writeback_inv_dcache_all(void) -{ - unsigned long addr = 0; - - while (addr < dcache_line_size * dcache_sets) { - cache_set_op(Index_Writeback_Inv_D, addr); - addr += dcache_line_size; - } -} - -/* - * Writeback and invalidate a range of the dcache. The addresses are - * virtual, and since we're using index ops and bit 12 is part of both - * the virtual frame and physical index, we have to clear both sets - * (bit 12 set and cleared). - */ -static inline void __sb1_writeback_inv_dcache_range(unsigned long start, - unsigned long end) -{ - unsigned long index; - - start &= ~(dcache_line_size - 1); - end = (end + dcache_line_size - 1) & ~(dcache_line_size - 1); - - while (start != end) { - index = start & dcache_index_mask; - cache_set_op(Index_Writeback_Inv_D, index); - cache_set_op(Index_Writeback_Inv_D, index ^ (1<<12)); - start += dcache_line_size; - } - sync(); -} - -/* - * Writeback and invalidate a range of the dcache. With physical - * addresseses, we don't have to worry about possible bit 12 aliasing. - * XXXKW is it worth turning on KX and using hit ops with xkphys? - */ -static inline void __sb1_writeback_inv_dcache_phys_range(unsigned long start, - unsigned long end) -{ - start &= ~(dcache_line_size - 1); - end = (end + dcache_line_size - 1) & ~(dcache_line_size - 1); - - while (start != end) { - cache_set_op(Index_Writeback_Inv_D, start & dcache_index_mask); - start += dcache_line_size; - } - sync(); -} - - -/* - * Invalidate the entire icache - */ -static inline void __sb1_flush_icache_all(void) -{ - unsigned long addr = 0; - - while (addr < icache_line_size * icache_sets) { - cache_set_op(Index_Invalidate_I, addr); - addr += icache_line_size; - } -} - -/* - * Invalidate a range of the icache. The addresses are virtual, and - * the cache is virtually indexed and tagged. However, we don't - * necessarily have the right ASID context, so use index ops instead - * of hit ops. - */ -static inline void __sb1_flush_icache_range(unsigned long start, - unsigned long end) -{ - start &= ~(icache_line_size - 1); - end = (end + icache_line_size - 1) & ~(icache_line_size - 1); - - while (start != end) { - cache_set_op(Index_Invalidate_I, start & icache_index_mask); - start += icache_line_size; - } - mispredict(); - sync(); -} - -/* - * Flush the icache for a given physical page. Need to writeback the - * dcache first, then invalidate the icache. If the page isn't - * executable, nothing is required. - */ -static void local_sb1_flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn) -{ - int cpu = smp_processor_id(); - -#ifndef CONFIG_SMP - if (!(vma->vm_flags & VM_EXEC)) - return; -#endif - - __sb1_writeback_inv_dcache_range(addr, addr + PAGE_SIZE); - - /* - * Bumping the ASID is probably cheaper than the flush ... - */ - if (vma->vm_mm == current->active_mm) { - if (cpu_context(cpu, vma->vm_mm) != 0) - drop_mmu_context(vma->vm_mm, cpu); - } else - __sb1_flush_icache_range(addr, addr + PAGE_SIZE); -} - -#ifdef CONFIG_SMP -struct flush_cache_page_args { - struct vm_area_struct *vma; - unsigned long addr; - unsigned long pfn; -}; - -static void sb1_flush_cache_page_ipi(void *info) -{ - struct flush_cache_page_args *args = info; - - local_sb1_flush_cache_page(args->vma, args->addr, args->pfn); -} - -/* Dirty dcache could be on another CPU, so do the IPIs */ -static void sb1_flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn) -{ - struct flush_cache_page_args args; - - if (!(vma->vm_flags & VM_EXEC)) - return; - - addr &= PAGE_MASK; - args.vma = vma; - args.addr = addr; - args.pfn = pfn; - sb1_on_each_cpu(sb1_flush_cache_page_ipi, (void *) &args, 1, 1); -} -#else -void sb1_flush_cache_page(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn) - __attribute__((alias("local_sb1_flush_cache_page"))); -#endif - -#ifdef CONFIG_SMP -static void sb1_flush_cache_data_page_ipi(void *info) -{ - unsigned long start = (unsigned long)info; - - __sb1_writeback_inv_dcache_range(start, start + PAGE_SIZE); -} - -static void sb1_flush_cache_data_page(unsigned long addr) -{ - if (in_atomic()) - __sb1_writeback_inv_dcache_range(addr, addr + PAGE_SIZE); - else - on_each_cpu(sb1_flush_cache_data_page_ipi, (void *) addr, 1, 1); -} -#else - -static void local_sb1_flush_cache_data_page(unsigned long addr) -{ - __sb1_writeback_inv_dcache_range(addr, addr + PAGE_SIZE); -} - -void sb1_flush_cache_data_page(unsigned long) - __attribute__((alias("local_sb1_flush_cache_data_page"))); -#endif - -/* - * Invalidate all caches on this CPU - */ -static void __used local_sb1___flush_cache_all(void) -{ - __sb1_writeback_inv_dcache_all(); - __sb1_flush_icache_all(); -} - -#ifdef CONFIG_SMP -void sb1___flush_cache_all_ipi(void *ignored) - __attribute__((alias("local_sb1___flush_cache_all"))); - -static void sb1___flush_cache_all(void) -{ - sb1_on_each_cpu(sb1___flush_cache_all_ipi, 0, 1, 1); -} -#else -void sb1___flush_cache_all(void) - __attribute__((alias("local_sb1___flush_cache_all"))); -#endif - -/* - * When flushing a range in the icache, we have to first writeback - * the dcache for the same range, so new ifetches will see any - * data that was dirty in the dcache. - * - * The start/end arguments are Kseg addresses (possibly mapped Kseg). - */ - -static void local_sb1_flush_icache_range(unsigned long start, - unsigned long end) -{ - /* Just wb-inv the whole dcache if the range is big enough */ - if ((end - start) > dcache_range_cutoff) - __sb1_writeback_inv_dcache_all(); - else - __sb1_writeback_inv_dcache_range(start, end); - - /* Just flush the whole icache if the range is big enough */ - if ((end - start) > icache_range_cutoff) - __sb1_flush_icache_all(); - else - __sb1_flush_icache_range(start, end); -} - -#ifdef CONFIG_SMP -struct flush_icache_range_args { - unsigned long start; - unsigned long end; -}; - -static void sb1_flush_icache_range_ipi(void *info) -{ - struct flush_icache_range_args *args = info; - - local_sb1_flush_icache_range(args->start, args->end); -} - -void sb1_flush_icache_range(unsigned long start, unsigned long end) -{ - struct flush_icache_range_args args; - - args.start = start; - args.end = end; - sb1_on_each_cpu(sb1_flush_icache_range_ipi, &args, 1, 1); -} -#else -void sb1_flush_icache_range(unsigned long start, unsigned long end) - __attribute__((alias("local_sb1_flush_icache_range"))); -#endif - -/* - * A signal trampoline must fit into a single cacheline. - */ -static void local_sb1_flush_cache_sigtramp(unsigned long addr) -{ - cache_set_op(Index_Writeback_Inv_D, addr & dcache_index_mask); - cache_set_op(Index_Writeback_Inv_D, (addr ^ (1<<12)) & dcache_index_mask); - cache_set_op(Index_Invalidate_I, addr & icache_index_mask); - mispredict(); -} - -#ifdef CONFIG_SMP -static void sb1_flush_cache_sigtramp_ipi(void *info) -{ - unsigned long iaddr = (unsigned long) info; - local_sb1_flush_cache_sigtramp(iaddr); -} - -static void sb1_flush_cache_sigtramp(unsigned long addr) -{ - sb1_on_each_cpu(sb1_flush_cache_sigtramp_ipi, (void *) addr, 1, 1); -} -#else -void sb1_flush_cache_sigtramp(unsigned long addr) - __attribute__((alias("local_sb1_flush_cache_sigtramp"))); -#endif - - -/* - * Anything that just flushes dcache state can be ignored, as we're always - * coherent in dcache space. This is just a dummy function that all the - * nop'ed routines point to - */ -static void sb1_nop(void) -{ -} - -/* - * Cache set values (from the mips64 spec) - * 0 - 64 - * 1 - 128 - * 2 - 256 - * 3 - 512 - * 4 - 1024 - * 5 - 2048 - * 6 - 4096 - * 7 - Reserved - */ - -static unsigned int decode_cache_sets(unsigned int config_field) -{ - if (config_field == 7) { - /* JDCXXX - Find a graceful way to abort. */ - return 0; - } - return (1<<(config_field + 6)); -} - -/* - * Cache line size values (from the mips64 spec) - * 0 - No cache present. - * 1 - 4 bytes - * 2 - 8 bytes - * 3 - 16 bytes - * 4 - 32 bytes - * 5 - 64 bytes - * 6 - 128 bytes - * 7 - Reserved - */ - -static unsigned int decode_cache_line_size(unsigned int config_field) -{ - if (config_field == 0) { - return 0; - } else if (config_field == 7) { - /* JDCXXX - Find a graceful way to abort. */ - return 0; - } - return (1<<(config_field + 1)); -} - -/* - * Relevant bits of the config1 register format (from the MIPS32/MIPS64 specs) - * - * 24:22 Icache sets per way - * 21:19 Icache line size - * 18:16 Icache Associativity - * 15:13 Dcache sets per way - * 12:10 Dcache line size - * 9:7 Dcache Associativity - */ - -static char *way_string[] = { - "direct mapped", "2-way", "3-way", "4-way", - "5-way", "6-way", "7-way", "8-way", -}; - -static __init void probe_cache_sizes(void) -{ - u32 config1; - - config1 = read_c0_config1(); - icache_line_size = decode_cache_line_size((config1 >> 19) & 0x7); - dcache_line_size = decode_cache_line_size((config1 >> 10) & 0x7); - icache_sets = decode_cache_sets((config1 >> 22) & 0x7); - dcache_sets = decode_cache_sets((config1 >> 13) & 0x7); - icache_assoc = ((config1 >> 16) & 0x7) + 1; - dcache_assoc = ((config1 >> 7) & 0x7) + 1; - icache_size = icache_line_size * icache_sets * icache_assoc; - dcache_size = dcache_line_size * dcache_sets * dcache_assoc; - /* Need to remove non-index bits for index ops */ - icache_index_mask = (icache_sets - 1) * icache_line_size; - dcache_index_mask = (dcache_sets - 1) * dcache_line_size; - /* - * These are for choosing range (index ops) versus all. - * icache flushes all ways for each set, so drop icache_assoc. - * dcache flushes all ways and each setting of bit 12 for each - * index, so drop dcache_assoc and halve the dcache_sets. - */ - icache_range_cutoff = icache_sets * icache_line_size; - dcache_range_cutoff = (dcache_sets / 2) * icache_line_size; - - printk("Primary instruction cache %ldkB, %s, linesize %d bytes.\n", - icache_size >> 10, way_string[icache_assoc - 1], - icache_line_size); - printk("Primary data cache %ldkB, %s, linesize %d bytes.\n", - dcache_size >> 10, way_string[dcache_assoc - 1], - dcache_line_size); -} - -/* - * This is called from cache.c. We have to set up all the - * memory management function pointers, as well as initialize - * the caches and tlbs - */ -void __init sb1_cache_init(void) -{ - extern char except_vec2_sb1; - - /* 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_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; - local_flush_data_cache_page = (void *) sb1_nop; - flush_data_cache_page = sb1_flush_cache_data_page; - - /* 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"); - - local_sb1___flush_cache_all(); -} |