1 files changed, 207 insertions, 0 deletions

diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
new file mode 100644
index 000000000000..191b4e974c4b
--- /dev/null
+++ b/arch/blackfin/mach-common/head.S
@@ -0,0 +1,207 @@
+/*
+ * Common Blackfin startup code
+ *
+ * Copyright 2004-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/blackfin.h>
+#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;
+
+        /* Save RETX, in case of doublefault */
+        p0.l = ___retx;
+        p0.h = ___retx;
+        R0 = RETX;
+        [P0] = R0;
+
+        /* 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
+
+ENTRY(_real_start)
+        /* Enable nested interrupts */
+        [--sp] = reti;
+
+        /* watchdog off for now */
+        p0.l = lo(WDOG_CTL);
+        p0.h = hi(WDOG_CTL);
+        r0 = 0xAD6(z);
+        w[p0] = r0;
+        ssync;
+
+        /* Zero out the bss region
+         * Note: this will fail if bss is 0 bytes ...
+         */
+        r0 = 0 (z);
+        r1.l = ___bss_start;
+        r1.h = ___bss_start;
+        r2.l = ___bss_stop;
+        r2.h = ___bss_stop;
+        r2 = r2 - r1;
+        r2 >>= 2;
+        p1 = r1;
+        p2 = r2;
+        lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
+.L_clear_bss:
+        [p1++] = r0;
+
+        /* In case there is a NULL pointer reference,
+         * zero out region before stext
+         */
+        p1 = r0;
+        r2.l = __stext;
+        r2.h = __stext;
+        r2 >>= 2;
+        p2 = r2;
+        lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
+.L_clear_zero:
+        [p1++] = r0;
+
+        /* Pass the u-boot arguments to the global value command line */
+        R0 = R7;
+        call _cmdline_init;
+
+        /* Load the current thread pointer and stack */
+        sp.l = _init_thread_union;
+        sp.h = _init_thread_union;
+        p1 = THREAD_SIZE (z);
+        sp = sp + p1;
+        usp = sp;
+        fp = sp;
+        jump.l _start_kernel;
+ENDPROC(_real_start)
+
+__FINIT