diff options
Diffstat (limited to 'arch/blackfin/mach-common/head.S')
| -rw-r--r-- | arch/blackfin/mach-common/head.S | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S deleted file mode 100644 index 31515f0146f9..000000000000 --- a/arch/blackfin/mach-common/head.S +++ /dev/null @@ -1,229 +0,0 @@ -/* - * Common Blackfin startup code - * - * Copyright 2004-2008 Analog Devices Inc. - * - * 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> -#include <asm/asm-offsets.h> - -__INIT - -ENTRY(__init_clear_bss) - r2 = r2 - r1; - cc = r2 == 0; - if cc jump .L_bss_done; - r2 >>= 2; - p1 = r1; - p2 = r2; - lsetup (1f, 1f) lc0 = p2; -1: [p1++] = r0; -.L_bss_done: - rts; -ENDPROC(__init_clear_bss) - -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; - - /* Optimization register tricks: keep a base value in the - * reserved P registers so we use the load/store with an - * offset syntax. R0 = [P5 + <constant>]; - * P5 - core MMR base - * R6 - 0 - */ - r6 = 0; - p5.l = 0; - p5.h = hi(COREMMR_BASE); - - /* Zero out registers required by Blackfin ABI */ - - /* Disable circular buffers */ - L0 = r6; - L1 = r6; - L2 = r6; - L3 = r6; - - /* Disable hardware loops in case we were started by 'go' */ - LC0 = r6; - LC1 = r6; - - /* - * Clear ITEST_COMMAND and DTEST_COMMAND registers, - * Leaving these as non-zero can confuse the emulator - */ - [p5 + (DTEST_COMMAND - COREMMR_BASE)] = r6; - [p5 + (ITEST_COMMAND - COREMMR_BASE)] = r6; - CSYNC; - - trace_buffer_init(p0,r0); - - /* Turn off the icache */ - r1 = [p5 + (IMEM_CONTROL - COREMMR_BASE)]; - BITCLR (r1, ENICPLB_P); - [p5 + (IMEM_CONTROL - COREMMR_BASE)] = r1; - SSYNC; - - /* Turn off the dcache */ - r1 = [p5 + (DMEM_CONTROL - COREMMR_BASE)]; - BITCLR (r1, ENDCPLB_P); - [p5 + (DMEM_CONTROL - COREMMR_BASE)] = r1; - SSYNC; - - /* in case of double faults, save a few things */ - p1.l = _initial_pda; - p1.h = _initial_pda; - r4 = RETX; -#ifdef CONFIG_DEBUG_DOUBLEFAULT - /* Only save these if we are storing them, - * This happens here, since L1 gets clobbered - * below - */ - GET_PDA(p0, r0); - r0 = [p0 + PDA_DF_RETX]; - r1 = [p0 + PDA_DF_DCPLB]; - r2 = [p0 + PDA_DF_ICPLB]; - r3 = [p0 + PDA_DF_SEQSTAT]; - [p1 + PDA_INIT_DF_RETX] = r0; - [p1 + PDA_INIT_DF_DCPLB] = r1; - [p1 + PDA_INIT_DF_ICPLB] = r2; - [p1 + PDA_INIT_DF_SEQSTAT] = r3; -#endif - [p1 + PDA_INIT_RETX] = r4; - - /* Initialize stack pointer */ - sp.l = _init_thread_union + THREAD_SIZE; - sp.h = _init_thread_union + THREAD_SIZE; - fp = sp; - usp = sp; - -#ifdef CONFIG_EARLY_PRINTK - call _init_early_exception_vectors; - r0 = (EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU); - sti r0; -#endif - - r0 = r6; - /* Zero out all of the fun bss regions */ -#if L1_DATA_A_LENGTH > 0 - r1.l = __sbss_l1; - r1.h = __sbss_l1; - r2.l = __ebss_l1; - r2.h = __ebss_l1; - call __init_clear_bss -#endif -#if L1_DATA_B_LENGTH > 0 - r1.l = __sbss_b_l1; - r1.h = __sbss_b_l1; - r2.l = __ebss_b_l1; - r2.h = __ebss_b_l1; - call __init_clear_bss -#endif -#if L2_LENGTH > 0 - r1.l = __sbss_l2; - r1.h = __sbss_l2; - r2.l = __ebss_l2; - r2.h = __ebss_l2; - call __init_clear_bss -#endif - r1.l = ___bss_start; - r1.h = ___bss_start; - r2.l = ___bss_stop; - r2.h = ___bss_stop; - call __init_clear_bss - - /* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */ - call _bfin_relocate_l1_mem; - -#ifdef CONFIG_ROMKERNEL - call _bfin_relocate_xip_data; -#endif - -#ifdef CONFIG_BFIN_KERNEL_CLOCK - /* Only use on-chip scratch space for stack when absolutely required - * to avoid Anomaly 05000227 ... we know the init_clocks() func only - * uses L1 text and stack space and no other memory region. - */ -# define KERNEL_CLOCK_STACK (L1_SCRATCH_START + L1_SCRATCH_LENGTH - 12) - sp.l = lo(KERNEL_CLOCK_STACK); - sp.h = hi(KERNEL_CLOCK_STACK); - call _init_clocks; - sp = usp; /* usp hasn't been touched, so restore from there */ -#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 */ - - p1.l = _real_start; - p1.h = _real_start; - [p5 + (EVT15 - COREMMR_BASE)] = p1; - csync; - -#ifdef CONFIG_EARLY_PRINTK - r0 = (EVT_IVG15 | EVT_IVHW | EVT_IRPTEN | EVT_EVX | EVT_NMI | EVT_RST | EVT_EMU) (z); -#else - r0 = EVT_IVG15 (z); -#endif - sti r0; - - raise 15; -#ifdef CONFIG_EARLY_PRINTK - p0.l = _early_trap; - p0.h = _early_trap; -#else - p0.l = .LWAIT_HERE; - p0.h = .LWAIT_HERE; -#endif - 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; - /* Pass the u-boot arguments to the global value command line */ - R0 = R7; - call _cmdline_init; - - sp += -12 + 4; /* +4 is for reti loading above */ - call _init_pda - sp += 12; - jump.l _start_kernel; -ENDPROC(_real_start) - -__FINIT |