| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * r2300.c: R2000 and R3000 specific mmu/cache code. |
| * |
| * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
| * |
| * with a lot of changes to make this thing work for R3000s |
| * Tx39XX R4k style caches added. HK |
| * Copyright (C) 1998, 1999, 2000 Harald Koerfgen |
| * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov |
| */ |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/smp.h> |
| #include <linux/mm.h> |
| |
| #include <asm/cacheops.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/mmu_context.h> |
| #include <asm/isadep.h> |
| #include <asm/io.h> |
| #include <asm/bootinfo.h> |
| #include <asm/cpu.h> |
| |
| /* For R3000 cores with R4000 style caches */ |
| static unsigned long icache_size, dcache_size; /* Size in bytes */ |
| |
| #include <asm/r4kcache.h> |
| |
| /* This sequence is required to ensure icache is disabled immediately */ |
| #define TX39_STOP_STREAMING() \ |
| __asm__ __volatile__( \ |
| ".set push\n\t" \ |
| ".set noreorder\n\t" \ |
| "b 1f\n\t" \ |
| "nop\n\t" \ |
| "1:\n\t" \ |
| ".set pop" \ |
| ) |
| |
| /* TX39H-style cache flush routines. */ |
| static void tx39h_flush_icache_all(void) |
| { |
| unsigned long flags, config; |
| |
| /* disable icache (set ICE#) */ |
| local_irq_save(flags); |
| config = read_c0_conf(); |
| write_c0_conf(config & ~TX39_CONF_ICE); |
| TX39_STOP_STREAMING(); |
| blast_icache16(); |
| write_c0_conf(config); |
| local_irq_restore(flags); |
| } |
| |
| static void tx39h_dma_cache_wback_inv(unsigned long addr, unsigned long size) |
| { |
| /* Catch bad driver code */ |
| BUG_ON(size == 0); |
| |
| iob(); |
| blast_inv_dcache_range(addr, addr + size); |
| } |
| |
| |
| /* TX39H2,TX39H3 */ |
| static inline void tx39_blast_dcache_page(unsigned long addr) |
| { |
| if (current_cpu_type() != CPU_TX3912) |
| blast_dcache16_page(addr); |
| } |
| |
| static inline void tx39_blast_dcache_page_indexed(unsigned long addr) |
| { |
| blast_dcache16_page_indexed(addr); |
| } |
| |
| static inline void tx39_blast_dcache(void) |
| { |
| blast_dcache16(); |
| } |
| |
| static inline void tx39_blast_icache_page(unsigned long addr) |
| { |
| unsigned long flags, config; |
| /* disable icache (set ICE#) */ |
| local_irq_save(flags); |
| config = read_c0_conf(); |
| write_c0_conf(config & ~TX39_CONF_ICE); |
| TX39_STOP_STREAMING(); |
| blast_icache16_page(addr); |
| write_c0_conf(config); |
| local_irq_restore(flags); |
| } |
| |
| static inline void tx39_blast_icache_page_indexed(unsigned long addr) |
| { |
| unsigned long flags, config; |
| /* disable icache (set ICE#) */ |
| local_irq_save(flags); |
| config = read_c0_conf(); |
| write_c0_conf(config & ~TX39_CONF_ICE); |
| TX39_STOP_STREAMING(); |
| blast_icache16_page_indexed(addr); |
| write_c0_conf(config); |
| local_irq_restore(flags); |
| } |
| |
| static inline void tx39_blast_icache(void) |
| { |
| unsigned long flags, config; |
| /* disable icache (set ICE#) */ |
| local_irq_save(flags); |
| config = read_c0_conf(); |
| write_c0_conf(config & ~TX39_CONF_ICE); |
| TX39_STOP_STREAMING(); |
| blast_icache16(); |
| write_c0_conf(config); |
| local_irq_restore(flags); |
| } |
| |
| static void tx39__flush_cache_vmap(void) |
| { |
| tx39_blast_dcache(); |
| } |
| |
| static void tx39__flush_cache_vunmap(void) |
| { |
| tx39_blast_dcache(); |
| } |
| |
| static inline void tx39_flush_cache_all(void) |
| { |
| if (!cpu_has_dc_aliases) |
| return; |
| |
| tx39_blast_dcache(); |
| } |
| |
| static inline void tx39___flush_cache_all(void) |
| { |
| tx39_blast_dcache(); |
| tx39_blast_icache(); |
| } |
| |
| static void tx39_flush_cache_mm(struct mm_struct *mm) |
| { |
| if (!cpu_has_dc_aliases) |
| return; |
| |
| if (cpu_context(smp_processor_id(), mm) != 0) |
| tx39_blast_dcache(); |
| } |
| |
| static void tx39_flush_cache_range(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end) |
| { |
| if (!cpu_has_dc_aliases) |
| return; |
| if (!(cpu_context(smp_processor_id(), vma->vm_mm))) |
| return; |
| |
| tx39_blast_dcache(); |
| } |
| |
| static void tx39_flush_cache_page(struct vm_area_struct *vma, unsigned long page, unsigned long pfn) |
| { |
| int exec = vma->vm_flags & VM_EXEC; |
| struct mm_struct *mm = vma->vm_mm; |
| pgd_t *pgdp; |
| p4d_t *p4dp; |
| pud_t *pudp; |
| pmd_t *pmdp; |
| pte_t *ptep; |
| |
| /* |
| * If ownes no valid ASID yet, cannot possibly have gotten |
| * this page into the cache. |
| */ |
| if (cpu_context(smp_processor_id(), mm) == 0) |
| return; |
| |
| page &= PAGE_MASK; |
| pgdp = pgd_offset(mm, page); |
| p4dp = p4d_offset(pgdp, page); |
| pudp = pud_offset(p4dp, page); |
| pmdp = pmd_offset(pudp, page); |
| ptep = pte_offset(pmdp, page); |
| |
| /* |
| * If the page isn't marked valid, the page cannot possibly be |
| * in the cache. |
| */ |
| if (!(pte_val(*ptep) & _PAGE_PRESENT)) |
| return; |
| |
| /* |
| * Doing flushes for another ASID than the current one is |
| * too difficult since stupid R4k caches do a TLB translation |
| * for every cache flush operation. So we do indexed flushes |
| * in that case, which doesn't overly flush the cache too much. |
| */ |
| if ((mm == current->active_mm) && (pte_val(*ptep) & _PAGE_VALID)) { |
| if (cpu_has_dc_aliases || exec) |
| tx39_blast_dcache_page(page); |
| if (exec) |
| tx39_blast_icache_page(page); |
| |
| return; |
| } |
| |
| /* |
| * Do indexed flush, too much work to get the (possible) TLB refills |
| * to work correctly. |
| */ |
| if (cpu_has_dc_aliases || exec) |
| tx39_blast_dcache_page_indexed(page); |
| if (exec) |
| tx39_blast_icache_page_indexed(page); |
| } |
| |
| static void local_tx39_flush_data_cache_page(void * addr) |
| { |
| tx39_blast_dcache_page((unsigned long)addr); |
| } |
| |
| static void tx39_flush_data_cache_page(unsigned long addr) |
| { |
| tx39_blast_dcache_page(addr); |
| } |
| |
| static void tx39_flush_icache_range(unsigned long start, unsigned long end) |
| { |
| if (end - start > dcache_size) |
| tx39_blast_dcache(); |
| else |
| protected_blast_dcache_range(start, end); |
| |
| if (end - start > icache_size) |
| tx39_blast_icache(); |
| else { |
| unsigned long flags, config; |
| /* disable icache (set ICE#) */ |
| local_irq_save(flags); |
| config = read_c0_conf(); |
| write_c0_conf(config & ~TX39_CONF_ICE); |
| TX39_STOP_STREAMING(); |
| protected_blast_icache_range(start, end); |
| write_c0_conf(config); |
| local_irq_restore(flags); |
| } |
| } |
| |
| static void tx39_flush_kernel_vmap_range(unsigned long vaddr, int size) |
| { |
| BUG(); |
| } |
| |
| static void tx39_dma_cache_wback_inv(unsigned long addr, unsigned long size) |
| { |
| unsigned long end; |
| |
| if (((size | addr) & (PAGE_SIZE - 1)) == 0) { |
| end = addr + size; |
| do { |
| tx39_blast_dcache_page(addr); |
| addr += PAGE_SIZE; |
| } while(addr != end); |
| } else if (size > dcache_size) { |
| tx39_blast_dcache(); |
| } else { |
| blast_dcache_range(addr, addr + size); |
| } |
| } |
| |
| static void tx39_dma_cache_inv(unsigned long addr, unsigned long size) |
| { |
| unsigned long end; |
| |
| if (((size | addr) & (PAGE_SIZE - 1)) == 0) { |
| end = addr + size; |
| do { |
| tx39_blast_dcache_page(addr); |
| addr += PAGE_SIZE; |
| } while(addr != end); |
| } else if (size > dcache_size) { |
| tx39_blast_dcache(); |
| } else { |
| blast_inv_dcache_range(addr, addr + size); |
| } |
| } |
| |
| static __init void tx39_probe_cache(void) |
| { |
| unsigned long config; |
| |
| config = read_c0_conf(); |
| |
| icache_size = 1 << (10 + ((config & TX39_CONF_ICS_MASK) >> |
| TX39_CONF_ICS_SHIFT)); |
| dcache_size = 1 << (10 + ((config & TX39_CONF_DCS_MASK) >> |
| TX39_CONF_DCS_SHIFT)); |
| |
| current_cpu_data.icache.linesz = 16; |
| switch (current_cpu_type()) { |
| case CPU_TX3912: |
| current_cpu_data.icache.ways = 1; |
| current_cpu_data.dcache.ways = 1; |
| current_cpu_data.dcache.linesz = 4; |
| break; |
| |
| case CPU_TX3927: |
| current_cpu_data.icache.ways = 2; |
| current_cpu_data.dcache.ways = 2; |
| current_cpu_data.dcache.linesz = 16; |
| break; |
| |
| case CPU_TX3922: |
| default: |
| current_cpu_data.icache.ways = 1; |
| current_cpu_data.dcache.ways = 1; |
| current_cpu_data.dcache.linesz = 16; |
| break; |
| } |
| } |
| |
| void tx39_cache_init(void) |
| { |
| extern void build_clear_page(void); |
| extern void build_copy_page(void); |
| unsigned long config; |
| |
| config = read_c0_conf(); |
| config &= ~TX39_CONF_WBON; |
| write_c0_conf(config); |
| |
| tx39_probe_cache(); |
| |
| switch (current_cpu_type()) { |
| case CPU_TX3912: |
| /* TX39/H core (writethru direct-map cache) */ |
| __flush_cache_vmap = tx39__flush_cache_vmap; |
| __flush_cache_vunmap = tx39__flush_cache_vunmap; |
| flush_cache_all = tx39h_flush_icache_all; |
| __flush_cache_all = tx39h_flush_icache_all; |
| flush_cache_mm = (void *) tx39h_flush_icache_all; |
| flush_cache_range = (void *) tx39h_flush_icache_all; |
| flush_cache_page = (void *) tx39h_flush_icache_all; |
| flush_icache_range = (void *) tx39h_flush_icache_all; |
| local_flush_icache_range = (void *) tx39h_flush_icache_all; |
| |
| local_flush_data_cache_page = (void *) tx39h_flush_icache_all; |
| flush_data_cache_page = (void *) tx39h_flush_icache_all; |
| |
| _dma_cache_wback_inv = tx39h_dma_cache_wback_inv; |
| |
| shm_align_mask = PAGE_SIZE - 1; |
| |
| break; |
| |
| case CPU_TX3922: |
| case CPU_TX3927: |
| default: |
| /* TX39/H2,H3 core (writeback 2way-set-associative cache) */ |
| /* board-dependent init code may set WBON */ |
| |
| __flush_cache_vmap = tx39__flush_cache_vmap; |
| __flush_cache_vunmap = tx39__flush_cache_vunmap; |
| |
| flush_cache_all = tx39_flush_cache_all; |
| __flush_cache_all = tx39___flush_cache_all; |
| flush_cache_mm = tx39_flush_cache_mm; |
| flush_cache_range = tx39_flush_cache_range; |
| flush_cache_page = tx39_flush_cache_page; |
| flush_icache_range = tx39_flush_icache_range; |
| local_flush_icache_range = tx39_flush_icache_range; |
| |
| __flush_kernel_vmap_range = tx39_flush_kernel_vmap_range; |
| |
| local_flush_data_cache_page = local_tx39_flush_data_cache_page; |
| flush_data_cache_page = tx39_flush_data_cache_page; |
| |
| _dma_cache_wback_inv = tx39_dma_cache_wback_inv; |
| _dma_cache_wback = tx39_dma_cache_wback_inv; |
| _dma_cache_inv = tx39_dma_cache_inv; |
| |
| shm_align_mask = max_t(unsigned long, |
| (dcache_size / current_cpu_data.dcache.ways) - 1, |
| PAGE_SIZE - 1); |
| |
| break; |
| } |
| |
| __flush_icache_user_range = flush_icache_range; |
| __local_flush_icache_user_range = local_flush_icache_range; |
| |
| current_cpu_data.icache.waysize = icache_size / current_cpu_data.icache.ways; |
| current_cpu_data.dcache.waysize = dcache_size / current_cpu_data.dcache.ways; |
| |
| current_cpu_data.icache.sets = |
| current_cpu_data.icache.waysize / current_cpu_data.icache.linesz; |
| current_cpu_data.dcache.sets = |
| current_cpu_data.dcache.waysize / current_cpu_data.dcache.linesz; |
| |
| if (current_cpu_data.dcache.waysize > PAGE_SIZE) |
| current_cpu_data.dcache.flags |= MIPS_CACHE_ALIASES; |
| |
| current_cpu_data.icache.waybit = 0; |
| current_cpu_data.dcache.waybit = 0; |
| |
| printk("Primary instruction cache %ldkB, linesize %d bytes\n", |
| icache_size >> 10, current_cpu_data.icache.linesz); |
| printk("Primary data cache %ldkB, linesize %d bytes\n", |
| dcache_size >> 10, current_cpu_data.dcache.linesz); |
| |
| build_clear_page(); |
| build_copy_page(); |
| tx39h_flush_icache_all(); |
| } |