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)
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)
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
* 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)
/*
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
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)
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