diff options
Diffstat (limited to 'arch/arm/mach-uniphier/lowlevel_init.S')
| -rw-r--r-- | arch/arm/mach-uniphier/lowlevel_init.S | 102 |
1 files changed, 94 insertions, 8 deletions
diff --git a/arch/arm/mach-uniphier/lowlevel_init.S b/arch/arm/mach-uniphier/lowlevel_init.S index 291337070e..dd03ad8143 100644 --- a/arch/arm/mach-uniphier/lowlevel_init.S +++ b/arch/arm/mach-uniphier/lowlevel_init.S @@ -29,12 +29,16 @@ ENTRY(lowlevel_init) bl debug_ll_init #endif + bl setup_init_ram @ RAM area for stack and page talbe + /* * Now we are using the page table embedded in the Boot ROM. * It is not handy since it is not a straight mapped table for sLD3. - * What we need to do next is to switch over to the page table in SPL. + * Also, the access to the external bus is prohibited. What we need + * to do next is to create a page table and switch over to it. */ - ldr r3, =init_page_table @ page table must be 16KB aligned + bl create_page_table + bl v7_flush_dcache_all /* Disable MMU and Dcache before switching Page Table */ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register) @@ -43,8 +47,6 @@ ENTRY(lowlevel_init) bl enable_mmu - bl setup_init_ram @ RAM area for temporary stack pointer - mov lr, r8 @ restore link mov pc, lr @ back to my caller ENDPROC(lowlevel_init) @@ -55,7 +57,7 @@ ENTRY(enable_mmu) orr r0, r0, #0x20 @ disable TTBR1 mcr p15, 0, r0, c2, c0, 2 - orr r0, r3, #0x8 @ Outer Cacheability for table walks: WBWA + orr r0, r12, #0x8 @ Outer Cacheability for table walks: WBWA mcr p15, 0, r0, c2, c0, 0 @ TTBR0 mov r0, #0 @@ -82,8 +84,9 @@ ENDPROC(enable_mmu) * For PH1-Pro4 or older SoCs, the size of WAY is 32KB. * It is large enough for tmp RAM. */ -#define BOOT_RAM_SIZE (SZ_32K) -#define BOOT_WAY_BITS (0x00000100) /* way 8 */ +#define BOOT_RAM_SIZE (SZ_32K) +#define BOOT_RAM_BASE ((CONFIG_SPL_STACK) - (BOOT_RAM_SIZE)) +#define BOOT_WAY_BITS (0x00000100) /* way 8 */ ENTRY(setup_init_ram) /* @@ -96,7 +99,7 @@ ENTRY(setup_init_ram) ldr r0, = 0x00408006 @ touch to zero with address range ldr r1, = SSCOQM str r0, [r1] - ldr r0, = (CONFIG_SPL_STACK - BOOT_RAM_SIZE) @ base address + ldr r0, = BOOT_RAM_BASE ldr r1, = SSCOQAD str r0, [r1] ldr r0, = BOOT_RAM_SIZE @@ -119,3 +122,86 @@ ENTRY(setup_init_ram) mov pc, lr ENDPROC(setup_init_ram) + +#define DEVICE 0x00002002 /* Non-shareable Device */ +#define NORMAL 0x0000000e /* Normal Memory Write-Back, No Write-Allocate */ + +ENTRY(create_page_table) + ldr r0, = DEVICE + ldr r1, = BOOT_RAM_BASE + mov r12, r1 @ r12 is preserved during D-cache flush +0: str r0, [r1], #4 @ specify all the sections as Device + adds r0, r0, #0x00100000 + bcc 0b + + ldr r0, = NORMAL + str r0, [r12] @ mark the first section as Normal + add r0, r0, #0x00100000 + str r0, [r12, #4] @ mark the second section as Normal + mov pc, lr +ENDPROC(create_page_table) + +/* We don't use Thumb instructions for now */ +#define ARM(x...) x +#define THUMB(x...) + +/* + * v7_flush_dcache_all() + * + * Flush the whole D-cache. + * + * Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode) + * + * - mm - mm_struct describing address space + * + * Note: copied from arch/arm/mm/cache-v7.S of Linux 4.4 + */ +ENTRY(v7_flush_dcache_all) + dmb @ ensure ordering with previous memory accesses + mrc p15, 1, r0, c0, c0, 1 @ read clidr + mov r3, r0, lsr #23 @ move LoC into position + ands r3, r3, #7 << 1 @ extract LoC*2 from clidr + beq finished @ if loc is 0, then no need to clean +start_flush_levels: + mov r10, #0 @ start clean at cache level 0 +flush_levels: + add r2, r10, r10, lsr #1 @ work out 3x current cache level + mov r1, r0, lsr r2 @ extract cache type bits from clidr + and r1, r1, #7 @ mask of the bits for current cache only + cmp r1, #2 @ see what cache we have at this level + blt skip @ skip if no cache, or just i-cache + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + isb @ isb to sych the new cssr&csidr + mrc p15, 1, r1, c0, c0, 0 @ read the new csidr + and r2, r1, #7 @ extract the length of the cache lines + add r2, r2, #4 @ add 4 (line length offset) + movw r4, #0x3ff + ands r4, r4, r1, lsr #3 @ find maximum number on the way size + clz r5, r4 @ find bit position of way size increment + movw r7, #0x7fff + ands r7, r7, r1, lsr #13 @ extract max number of the index size +loop1: + mov r9, r7 @ create working copy of max index +loop2: + ARM( orr r11, r10, r4, lsl r5 ) @ factor way and cache number into r11 + THUMB( lsl r6, r4, r5 ) + THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11 + ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11 + THUMB( lsl r6, r9, r2 ) + THUMB( orr r11, r11, r6 ) @ factor index number into r11 + mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way + subs r9, r9, #1 @ decrement the index + bge loop2 + subs r4, r4, #1 @ decrement the way + bge loop1 +skip: + add r10, r10, #2 @ increment cache number + cmp r3, r10 + bgt flush_levels +finished: + mov r10, #0 @ swith back to cache level 0 + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + dsb st + isb + mov pc, lr +ENDPROC(v7_flush_dcache_all) |
