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Diffstat (limited to 'arch/arm/mm/proc-mohawk.S')
| -rw-r--r-- | arch/arm/mm/proc-mohawk.S | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-mohawk.S b/arch/arm/mm/proc-mohawk.S new file mode 100644 index 000000000..1645ccaff --- /dev/null +++ b/arch/arm/mm/proc-mohawk.S @@ -0,0 +1,444 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * linux/arch/arm/mm/proc-mohawk.S: MMU functions for Marvell PJ1 core + * + * PJ1 (codename Mohawk) is a hybrid of the xscale3 and Marvell's own core. + * + * Heavily based on proc-arm926.S and proc-xsc3.S + */ + +#include <linux/linkage.h> +#include <linux/init.h> +#include <linux/pgtable.h> +#include <asm/assembler.h> +#include <asm/hwcap.h> +#include <asm/pgtable-hwdef.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#include "proc-macros.S" + +/* + * This is the maximum size of an area which will be flushed. If the + * area is larger than this, then we flush the whole cache. + */ +#define CACHE_DLIMIT 32768 + +/* + * The cache line size of the L1 D cache. + */ +#define CACHE_DLINESIZE 32 + +/* + * cpu_mohawk_proc_init() + */ +ENTRY(cpu_mohawk_proc_init) + ret lr + +/* + * cpu_mohawk_proc_fin() + */ +ENTRY(cpu_mohawk_proc_fin) + mrc p15, 0, r0, c1, c0, 0 @ ctrl register + bic r0, r0, #0x1800 @ ...iz........... + bic r0, r0, #0x0006 @ .............ca. + mcr p15, 0, r0, c1, c0, 0 @ disable caches + ret lr + +/* + * cpu_mohawk_reset(loc) + * + * Perform a soft reset of the system. Put the CPU into the + * same state as it would be if it had been reset, and branch + * to what would be the reset vector. + * + * loc: location to jump to for soft reset + * + * (same as arm926) + */ + .align 5 + .pushsection .idmap.text, "ax" +ENTRY(cpu_mohawk_reset) + mov ip, #0 + mcr p15, 0, ip, c7, c7, 0 @ invalidate I,D caches + mcr p15, 0, ip, c7, c10, 4 @ drain WB + mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs + mrc p15, 0, ip, c1, c0, 0 @ ctrl register + bic ip, ip, #0x0007 @ .............cam + bic ip, ip, #0x1100 @ ...i...s........ + mcr p15, 0, ip, c1, c0, 0 @ ctrl register + ret r0 +ENDPROC(cpu_mohawk_reset) + .popsection + +/* + * cpu_mohawk_do_idle() + * + * Called with IRQs disabled + */ + .align 5 +ENTRY(cpu_mohawk_do_idle) + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + mcr p15, 0, r0, c7, c0, 4 @ wait for interrupt + ret lr + +/* + * flush_icache_all() + * + * Unconditionally clean and invalidate the entire icache. + */ +ENTRY(mohawk_flush_icache_all) + mov r0, #0 + mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache + ret lr +ENDPROC(mohawk_flush_icache_all) + +/* + * flush_user_cache_all() + * + * Clean and invalidate all cache entries in a particular + * address space. + */ +ENTRY(mohawk_flush_user_cache_all) + /* FALLTHROUGH */ + +/* + * flush_kern_cache_all() + * + * Clean and invalidate the entire cache. + */ +ENTRY(mohawk_flush_kern_cache_all) + mov r2, #VM_EXEC + mov ip, #0 +__flush_whole_cache: + mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache + tst r2, #VM_EXEC + mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache + mcrne p15, 0, ip, c7, c10, 0 @ drain write buffer + ret lr + +/* + * flush_user_cache_range(start, end, flags) + * + * Clean and invalidate a range of cache entries in the + * specified address range. + * + * - start - start address (inclusive) + * - end - end address (exclusive) + * - flags - vm_flags describing address space + * + * (same as arm926) + */ +ENTRY(mohawk_flush_user_cache_range) + mov ip, #0 + sub r3, r1, r0 @ calculate total size + cmp r3, #CACHE_DLIMIT + bgt __flush_whole_cache +1: tst r2, #VM_EXEC + mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry + mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry + add r0, r0, #CACHE_DLINESIZE + mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry + mcrne p15, 0, r0, c7, c5, 1 @ invalidate I entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + tst r2, #VM_EXEC + mcrne p15, 0, ip, c7, c10, 4 @ drain WB + ret lr + +/* + * coherent_kern_range(start, end) + * + * Ensure coherency between the Icache and the Dcache in the + * region described by start, end. If you have non-snooping + * Harvard caches, you need to implement this function. + * + * - start - virtual start address + * - end - virtual end address + */ +ENTRY(mohawk_coherent_kern_range) + /* FALLTHROUGH */ + +/* + * coherent_user_range(start, end) + * + * Ensure coherency between the Icache and the Dcache in the + * region described by start, end. If you have non-snooping + * Harvard caches, you need to implement this function. + * + * - start - virtual start address + * - end - virtual end address + * + * (same as arm926) + */ +ENTRY(mohawk_coherent_user_range) + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry + mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mcr p15, 0, r0, c7, c10, 4 @ drain WB + mov r0, #0 + ret lr + +/* + * flush_kern_dcache_area(void *addr, size_t size) + * + * Ensure no D cache aliasing occurs, either with itself or + * the I cache + * + * - addr - kernel address + * - size - region size + */ +ENTRY(mohawk_flush_kern_dcache_area) + add r1, r0, r1 +1: mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache + mcr p15, 0, r0, c7, c10, 4 @ drain WB + ret lr + +/* + * dma_inv_range(start, end) + * + * Invalidate (discard) the specified virtual address range. + * May not write back any entries. If 'start' or 'end' + * are not cache line aligned, those lines must be written + * back. + * + * - start - virtual start address + * - end - virtual end address + * + * (same as v4wb) + */ +mohawk_dma_inv_range: + tst r0, #CACHE_DLINESIZE - 1 + mcrne p15, 0, r0, c7, c10, 1 @ clean D entry + tst r1, #CACHE_DLINESIZE - 1 + mcrne p15, 0, r1, c7, c10, 1 @ clean D entry + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mcr p15, 0, r0, c7, c10, 4 @ drain WB + ret lr + +/* + * dma_clean_range(start, end) + * + * Clean the specified virtual address range. + * + * - start - virtual start address + * - end - virtual end address + * + * (same as v4wb) + */ +mohawk_dma_clean_range: + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mcr p15, 0, r0, c7, c10, 4 @ drain WB + ret lr + +/* + * dma_flush_range(start, end) + * + * Clean and invalidate the specified virtual address range. + * + * - start - virtual start address + * - end - virtual end address + */ +ENTRY(mohawk_dma_flush_range) + bic r0, r0, #CACHE_DLINESIZE - 1 +1: + mcr p15, 0, r0, c7, c14, 1 @ clean+invalidate D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mcr p15, 0, r0, c7, c10, 4 @ drain WB + ret lr + +/* + * dma_map_area(start, size, dir) + * - start - kernel virtual start address + * - size - size of region + * - dir - DMA direction + */ +ENTRY(mohawk_dma_map_area) + add r1, r1, r0 + cmp r2, #DMA_TO_DEVICE + beq mohawk_dma_clean_range + bcs mohawk_dma_inv_range + b mohawk_dma_flush_range +ENDPROC(mohawk_dma_map_area) + +/* + * dma_unmap_area(start, size, dir) + * - start - kernel virtual start address + * - size - size of region + * - dir - DMA direction + */ +ENTRY(mohawk_dma_unmap_area) + ret lr +ENDPROC(mohawk_dma_unmap_area) + + .globl mohawk_flush_kern_cache_louis + .equ mohawk_flush_kern_cache_louis, mohawk_flush_kern_cache_all + + @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) + define_cache_functions mohawk + +ENTRY(cpu_mohawk_dcache_clean_area) +1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry + add r0, r0, #CACHE_DLINESIZE + subs r1, r1, #CACHE_DLINESIZE + bhi 1b + mcr p15, 0, r0, c7, c10, 4 @ drain WB + ret lr + +/* + * cpu_mohawk_switch_mm(pgd) + * + * Set the translation base pointer to be as described by pgd. + * + * pgd: new page tables + */ + .align 5 +ENTRY(cpu_mohawk_switch_mm) + mov ip, #0 + mcr p15, 0, ip, c7, c14, 0 @ clean & invalidate all D cache + mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache + mcr p15, 0, ip, c7, c10, 4 @ drain WB + orr r0, r0, #0x18 @ cache the page table in L2 + mcr p15, 0, r0, c2, c0, 0 @ load page table pointer + mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs + ret lr + +/* + * cpu_mohawk_set_pte_ext(ptep, pte, ext) + * + * Set a PTE and flush it out + */ + .align 5 +ENTRY(cpu_mohawk_set_pte_ext) +#ifdef CONFIG_MMU + armv3_set_pte_ext + mov r0, r0 + mcr p15, 0, r0, c7, c10, 1 @ clean D entry + mcr p15, 0, r0, c7, c10, 4 @ drain WB + ret lr +#endif + +.globl cpu_mohawk_suspend_size +.equ cpu_mohawk_suspend_size, 4 * 6 +#ifdef CONFIG_ARM_CPU_SUSPEND +ENTRY(cpu_mohawk_do_suspend) + stmfd sp!, {r4 - r9, lr} + mrc p14, 0, r4, c6, c0, 0 @ clock configuration, for turbo mode + mrc p15, 0, r5, c15, c1, 0 @ CP access reg + mrc p15, 0, r6, c13, c0, 0 @ PID + mrc p15, 0, r7, c3, c0, 0 @ domain ID + mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg + mrc p15, 0, r9, c1, c0, 0 @ control reg + bic r4, r4, #2 @ clear frequency change bit + stmia r0, {r4 - r9} @ store cp regs + ldmia sp!, {r4 - r9, pc} +ENDPROC(cpu_mohawk_do_suspend) + +ENTRY(cpu_mohawk_do_resume) + ldmia r0, {r4 - r9} @ load cp regs + mov ip, #0 + mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB + mcr p15, 0, ip, c7, c10, 4 @ drain write (&fill) buffer + mcr p15, 0, ip, c7, c5, 4 @ flush prefetch buffer + mcr p15, 0, ip, c8, c7, 0 @ invalidate I & D TLBs + mcr p14, 0, r4, c6, c0, 0 @ clock configuration, turbo mode. + mcr p15, 0, r5, c15, c1, 0 @ CP access reg + mcr p15, 0, r6, c13, c0, 0 @ PID + mcr p15, 0, r7, c3, c0, 0 @ domain ID + orr r1, r1, #0x18 @ cache the page table in L2 + mcr p15, 0, r1, c2, c0, 0 @ translation table base addr + mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg + mov r0, r9 @ control register + b cpu_resume_mmu +ENDPROC(cpu_mohawk_do_resume) +#endif + + .type __mohawk_setup, #function +__mohawk_setup: + mov r0, #0 + mcr p15, 0, r0, c7, c7 @ invalidate I,D caches + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + mcr p15, 0, r0, c8, c7 @ invalidate I,D TLBs + orr r4, r4, #0x18 @ cache the page table in L2 + mcr p15, 0, r4, c2, c0, 0 @ load page table pointer + + mov r0, #0 @ don't allow CP access + mcr p15, 0, r0, c15, c1, 0 @ write CP access register + + adr r5, mohawk_crval + ldmia r5, {r5, r6} + mrc p15, 0, r0, c1, c0 @ get control register + bic r0, r0, r5 + orr r0, r0, r6 + ret lr + + .size __mohawk_setup, . - __mohawk_setup + + /* + * R + * .RVI ZFRS BLDP WCAM + * .011 1001 ..00 0101 + * + */ + .type mohawk_crval, #object +mohawk_crval: + crval clear=0x00007f3f, mmuset=0x00003905, ucset=0x00001134 + + __INITDATA + + @ define struct processor (see <asm/proc-fns.h> and proc-macros.S) + define_processor_functions mohawk, dabort=v5t_early_abort, pabort=legacy_pabort + + .section ".rodata" + + string cpu_arch_name, "armv5te" + string cpu_elf_name, "v5" + string cpu_mohawk_name, "Marvell 88SV331x" + + .align + + .section ".proc.info.init", "a" + + .type __88sv331x_proc_info,#object +__88sv331x_proc_info: + .long 0x56158000 @ Marvell 88SV331x (MOHAWK) + .long 0xfffff000 + .long PMD_TYPE_SECT | \ + PMD_SECT_BUFFERABLE | \ + PMD_SECT_CACHEABLE | \ + PMD_BIT4 | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ + .long PMD_TYPE_SECT | \ + PMD_BIT4 | \ + PMD_SECT_AP_WRITE | \ + PMD_SECT_AP_READ + initfn __mohawk_setup, __88sv331x_proc_info + .long cpu_arch_name + .long cpu_elf_name + .long HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP + .long cpu_mohawk_name + .long mohawk_processor_functions + .long v4wbi_tlb_fns + .long v4wb_user_fns + .long mohawk_cache_fns + .size __88sv331x_proc_info, . - __88sv331x_proc_info |