Blackfin arch: unify the duplicated portions of __start and split mach-specific piece...

[safe/jmp/linux-2.6] / arch / blackfin / mach-common / head.S

diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
index 6a989a0..2c69ad4 100644 (file)
--- a/arch/blackfin/mach-common/head.S
+++ b/arch/blackfin/mach-common/head.S
@@ -14,13 +14,140 @@
 #include <asm/thread_info.h>
 #include <asm/trace.h>
 
+__INIT
+
+#define INITIAL_STACK  (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12)
+
+ENTRY(__start)
+       /* R0: argument of command line string, passed from uboot, save it */
+       R7 = R0;
+       /* Enable Cycle Counter and Nesting Of Interrupts */
+#ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
+       R0 = SYSCFG_SNEN;
+#else
+       R0 = SYSCFG_SNEN | SYSCFG_CCEN;
+#endif
+       SYSCFG = R0;
+       R0 = 0;
+
+       /* Clear Out All the data and pointer Registers */
+       R1 = R0;
+       R2 = R0;
+       R3 = R0;
+       R4 = R0;
+       R5 = R0;
+       R6 = R0;
+
+       P0 = R0;
+       P1 = R0;
+       P2 = R0;
+       P3 = R0;
+       P4 = R0;
+       P5 = R0;
+
+       LC0 = r0;
+       LC1 = r0;
+       L0 = r0;
+       L1 = r0;
+       L2 = r0;
+       L3 = r0;
+
+       /* Clear Out All the DAG Registers */
+       B0 = r0;
+       B1 = r0;
+       B2 = r0;
+       B3 = r0;
+
+       I0 = r0;
+       I1 = r0;
+       I2 = r0;
+       I3 = r0;
+
+       M0 = r0;
+       M1 = r0;
+       M2 = r0;
+       M3 = r0;
+
+       trace_buffer_init(p0,r0);
+       P0 = R1;
+       R0 = R1;
+
+       /* Turn off the icache */
+       p0.l = LO(IMEM_CONTROL);
+       p0.h = HI(IMEM_CONTROL);
+       R1 = [p0];
+       R0 = ~ENICPLB;
+       R0 = R0 & R1;
+       [p0] = R0;
+       SSYNC;
+
+       /* Turn off the dcache */
+       p0.l = LO(DMEM_CONTROL);
+       p0.h = HI(DMEM_CONTROL);
+       R1 = [p0];
+       R0 = ~ENDCPLB;
+       R0 = R0 & R1;
+       [p0] = R0;
+       SSYNC;
+
+       /* Let each Blackfin family do its own thing */
+       call _mach_early_start;
+
+       /* Initialize stack pointer */
+       sp.l = lo(INITIAL_STACK);
+       sp.h = hi(INITIAL_STACK);
+       fp = sp;
+       usp = sp;
+
+#ifdef CONFIG_EARLY_PRINTK
+       call _init_early_exception_vectors;
+#endif
+
+       /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
+       call _bf53x_relocate_l1_mem;
+#ifdef CONFIG_BFIN_KERNEL_CLOCK
+       call _start_dma_code;
+#endif
+
+       /* This section keeps the processor in supervisor mode
+        * during kernel boot.  Switches to user mode at end of boot.
+        * See page 3-9 of Hardware Reference manual for documentation.
+        */
+
+       /* EVT15 = _real_start */
+
+       p0.l = lo(EVT15);
+       p0.h = hi(EVT15);
+       p1.l = _real_start;
+       p1.h = _real_start;
+       [p0] = p1;
+       csync;
+
+       p0.l = lo(IMASK);
+       p0.h = hi(IMASK);
+       p1.l = IMASK_IVG15;
+       p1.h = 0x0;
+       [p0] = p1;
+       csync;
+
+       raise 15;
+       p0.l = .LWAIT_HERE;
+       p0.h = .LWAIT_HERE;
+       reti = p0;
+#if ANOMALY_05000281
+       nop; nop; nop;
+#endif
+       rti;
+
+.LWAIT_HERE:
+       jump .LWAIT_HERE;
+ENDPROC(__start)
+
 /* A little BF561 glue ... */
 #ifndef WDOG_CTL
 # define WDOG_CTL WDOGA_CTL
 #endif
 
-__INIT
-
 ENTRY(_real_start)
        /* Enable nested interrupts */
        [--sp] = reti;