diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/mips/mm/c-r3k.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/mm/c-r3k.c')
-rw-r--r-- | arch/mips/mm/c-r3k.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/arch/mips/mm/c-r3k.c b/arch/mips/mm/c-r3k.c new file mode 100644 index 0000000000..5869df848f --- /dev/null +++ b/arch/mips/mm/c-r3k.c @@ -0,0 +1,314 @@ +// 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 + * Copyright (C) 2001, 2004, 2007 Maciej W. Rozycki + */ +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/smp.h> +#include <linux/mm.h> + +#include <asm/page.h> +#include <asm/mmu_context.h> +#include <asm/isadep.h> +#include <asm/io.h> +#include <asm/bootinfo.h> +#include <asm/cpu.h> + +static unsigned long icache_size, dcache_size; /* Size in bytes */ +static unsigned long icache_lsize, dcache_lsize; /* Size in bytes */ + +unsigned long r3k_cache_size(unsigned long ca_flags) +{ + unsigned long flags, status, dummy, size; + volatile unsigned long *p; + + p = (volatile unsigned long *) KSEG0; + + flags = read_c0_status(); + + /* isolate cache space */ + write_c0_status((ca_flags|flags)&~ST0_IEC); + + *p = 0xa5a55a5a; + dummy = *p; + status = read_c0_status(); + + if (dummy != 0xa5a55a5a || (status & ST0_CM)) { + size = 0; + } else { + for (size = 128; size <= 0x40000; size <<= 1) + *(p + size) = 0; + *p = -1; + for (size = 128; + (size <= 0x40000) && (*(p + size) == 0); + size <<= 1) + ; + if (size > 0x40000) + size = 0; + } + + write_c0_status(flags); + + return size * sizeof(*p); +} + +unsigned long r3k_cache_lsize(unsigned long ca_flags) +{ + unsigned long flags, status, lsize, i; + volatile unsigned long *p; + + p = (volatile unsigned long *) KSEG0; + + flags = read_c0_status(); + + /* isolate cache space */ + write_c0_status((ca_flags|flags)&~ST0_IEC); + + for (i = 0; i < 128; i++) + *(p + i) = 0; + *(volatile unsigned char *)p = 0; + for (lsize = 1; lsize < 128; lsize <<= 1) { + *(p + lsize); + status = read_c0_status(); + if (!(status & ST0_CM)) + break; + } + for (i = 0; i < 128; i += lsize) + *(volatile unsigned char *)(p + i) = 0; + + write_c0_status(flags); + + return lsize * sizeof(*p); +} + +static void r3k_probe_cache(void) +{ + dcache_size = r3k_cache_size(ST0_ISC); + if (dcache_size) + dcache_lsize = r3k_cache_lsize(ST0_ISC); + + icache_size = r3k_cache_size(ST0_ISC|ST0_SWC); + if (icache_size) + icache_lsize = r3k_cache_lsize(ST0_ISC|ST0_SWC); +} + +static void r3k_flush_icache_range(unsigned long start, unsigned long end) +{ + unsigned long size, i, flags; + volatile unsigned char *p; + + size = end - start; + if (size > icache_size || KSEGX(start) != KSEG0) { + start = KSEG0; + size = icache_size; + } + p = (char *)start; + + flags = read_c0_status(); + + /* isolate cache space */ + write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC); + + for (i = 0; i < size; i += 0x080) { + asm( "sb\t$0, 0x000(%0)\n\t" + "sb\t$0, 0x004(%0)\n\t" + "sb\t$0, 0x008(%0)\n\t" + "sb\t$0, 0x00c(%0)\n\t" + "sb\t$0, 0x010(%0)\n\t" + "sb\t$0, 0x014(%0)\n\t" + "sb\t$0, 0x018(%0)\n\t" + "sb\t$0, 0x01c(%0)\n\t" + "sb\t$0, 0x020(%0)\n\t" + "sb\t$0, 0x024(%0)\n\t" + "sb\t$0, 0x028(%0)\n\t" + "sb\t$0, 0x02c(%0)\n\t" + "sb\t$0, 0x030(%0)\n\t" + "sb\t$0, 0x034(%0)\n\t" + "sb\t$0, 0x038(%0)\n\t" + "sb\t$0, 0x03c(%0)\n\t" + "sb\t$0, 0x040(%0)\n\t" + "sb\t$0, 0x044(%0)\n\t" + "sb\t$0, 0x048(%0)\n\t" + "sb\t$0, 0x04c(%0)\n\t" + "sb\t$0, 0x050(%0)\n\t" + "sb\t$0, 0x054(%0)\n\t" + "sb\t$0, 0x058(%0)\n\t" + "sb\t$0, 0x05c(%0)\n\t" + "sb\t$0, 0x060(%0)\n\t" + "sb\t$0, 0x064(%0)\n\t" + "sb\t$0, 0x068(%0)\n\t" + "sb\t$0, 0x06c(%0)\n\t" + "sb\t$0, 0x070(%0)\n\t" + "sb\t$0, 0x074(%0)\n\t" + "sb\t$0, 0x078(%0)\n\t" + "sb\t$0, 0x07c(%0)\n\t" + : : "r" (p) ); + p += 0x080; + } + + write_c0_status(flags); +} + +static void r3k_flush_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long size, i, flags; + volatile unsigned char *p; + + size = end - start; + if (size > dcache_size || KSEGX(start) != KSEG0) { + start = KSEG0; + size = dcache_size; + } + p = (char *)start; + + flags = read_c0_status(); + + /* isolate cache space */ + write_c0_status((ST0_ISC|flags)&~ST0_IEC); + + for (i = 0; i < size; i += 0x080) { + asm( "sb\t$0, 0x000(%0)\n\t" + "sb\t$0, 0x004(%0)\n\t" + "sb\t$0, 0x008(%0)\n\t" + "sb\t$0, 0x00c(%0)\n\t" + "sb\t$0, 0x010(%0)\n\t" + "sb\t$0, 0x014(%0)\n\t" + "sb\t$0, 0x018(%0)\n\t" + "sb\t$0, 0x01c(%0)\n\t" + "sb\t$0, 0x020(%0)\n\t" + "sb\t$0, 0x024(%0)\n\t" + "sb\t$0, 0x028(%0)\n\t" + "sb\t$0, 0x02c(%0)\n\t" + "sb\t$0, 0x030(%0)\n\t" + "sb\t$0, 0x034(%0)\n\t" + "sb\t$0, 0x038(%0)\n\t" + "sb\t$0, 0x03c(%0)\n\t" + "sb\t$0, 0x040(%0)\n\t" + "sb\t$0, 0x044(%0)\n\t" + "sb\t$0, 0x048(%0)\n\t" + "sb\t$0, 0x04c(%0)\n\t" + "sb\t$0, 0x050(%0)\n\t" + "sb\t$0, 0x054(%0)\n\t" + "sb\t$0, 0x058(%0)\n\t" + "sb\t$0, 0x05c(%0)\n\t" + "sb\t$0, 0x060(%0)\n\t" + "sb\t$0, 0x064(%0)\n\t" + "sb\t$0, 0x068(%0)\n\t" + "sb\t$0, 0x06c(%0)\n\t" + "sb\t$0, 0x070(%0)\n\t" + "sb\t$0, 0x074(%0)\n\t" + "sb\t$0, 0x078(%0)\n\t" + "sb\t$0, 0x07c(%0)\n\t" + : : "r" (p) ); + p += 0x080; + } + + write_c0_status(flags); +} + +static inline void r3k_flush_cache_all(void) +{ +} + +static inline void r3k___flush_cache_all(void) +{ + r3k_flush_dcache_range(KSEG0, KSEG0 + dcache_size); + r3k_flush_icache_range(KSEG0, KSEG0 + icache_size); +} + +static void r3k_flush_cache_mm(struct mm_struct *mm) +{ +} + +static void r3k_flush_cache_range(struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ +} + +static void r3k_flush_cache_page(struct vm_area_struct *vma, + unsigned long addr, unsigned long pfn) +{ + unsigned long kaddr = KSEG0ADDR(pfn << PAGE_SHIFT); + int exec = vma->vm_flags & VM_EXEC; + struct mm_struct *mm = vma->vm_mm; + pmd_t *pmdp; + pte_t *ptep; + + pr_debug("cpage[%08llx,%08lx]\n", + cpu_context(smp_processor_id(), mm), addr); + + /* No ASID => no such page in the cache. */ + if (cpu_context(smp_processor_id(), mm) == 0) + return; + + pmdp = pmd_off(mm, addr); + ptep = pte_offset_kernel(pmdp, addr); + + /* Invalid => no such page in the cache. */ + if (!(pte_val(*ptep) & _PAGE_PRESENT)) + return; + + r3k_flush_dcache_range(kaddr, kaddr + PAGE_SIZE); + if (exec) + r3k_flush_icache_range(kaddr, kaddr + PAGE_SIZE); +} + +static void r3k_flush_data_cache_page(unsigned long addr) +{ +} + +static void r3k_flush_kernel_vmap_range(unsigned long vaddr, int size) +{ + BUG(); +} + +static void r3k_dma_cache_wback_inv(unsigned long start, unsigned long size) +{ + /* Catch bad driver code */ + BUG_ON(size == 0); + + iob(); + r3k_flush_dcache_range(start, start + size); +} + +void r3k_cache_init(void) +{ + extern void build_clear_page(void); + extern void build_copy_page(void); + + r3k_probe_cache(); + + flush_cache_all = r3k_flush_cache_all; + __flush_cache_all = r3k___flush_cache_all; + flush_cache_mm = r3k_flush_cache_mm; + flush_cache_range = r3k_flush_cache_range; + flush_cache_page = r3k_flush_cache_page; + flush_icache_range = r3k_flush_icache_range; + local_flush_icache_range = r3k_flush_icache_range; + __flush_icache_user_range = r3k_flush_icache_range; + __local_flush_icache_user_range = r3k_flush_icache_range; + + __flush_kernel_vmap_range = r3k_flush_kernel_vmap_range; + + flush_data_cache_page = r3k_flush_data_cache_page; + + _dma_cache_wback_inv = r3k_dma_cache_wback_inv; + _dma_cache_wback = r3k_dma_cache_wback_inv; + _dma_cache_inv = r3k_dma_cache_wback_inv; + + pr_info("Primary instruction cache %ldkB, linesize %ld bytes.\n", + icache_size >> 10, icache_lsize); + pr_info("Primary data cache %ldkB, linesize %ld bytes.\n", + dcache_size >> 10, dcache_lsize); + + build_clear_page(); + build_copy_page(); +} |