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Diffstat (limited to 'arch/m68knommu/platform/coldfire/head.S')
| -rw-r--r-- | arch/m68knommu/platform/coldfire/head.S | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/arch/m68knommu/platform/coldfire/head.S b/arch/m68knommu/platform/coldfire/head.S deleted file mode 100644 index 129bff4956b5..000000000000 --- a/arch/m68knommu/platform/coldfire/head.S +++ /dev/null @@ -1,250 +0,0 @@ -/*****************************************************************************/ - -/* - * head.S -- common startup code for ColdFire CPUs. - * - * (C) Copyright 1999-2010, Greg Ungerer <gerg@snapgear.com>. - */ - -/*****************************************************************************/ - -#include <linux/sys.h> -#include <linux/linkage.h> -#include <linux/init.h> -#include <asm/asm-offsets.h> -#include <asm/coldfire.h> -#include <asm/mcfsim.h> -#include <asm/thread_info.h> - -/*****************************************************************************/ - -/* - * If we don't have a fixed memory size, then lets build in code - * to auto detect the DRAM size. Obviously this is the prefered - * method, and should work for most boards. It won't work for those - * that do not have their RAM starting at address 0, and it only - * works on SDRAM (not boards fitted with SRAM). - */ -#if CONFIG_RAMSIZE != 0 -.macro GET_MEM_SIZE - movel #CONFIG_RAMSIZE,%d0 /* hard coded memory size */ -.endm - -#elif defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \ - defined(CONFIG_M5249) || defined(CONFIG_M527x) || \ - defined(CONFIG_M528x) || defined(CONFIG_M5307) || \ - defined(CONFIG_M5407) -/* - * Not all these devices have exactly the same DRAM controller, - * but the DCMR register is virtually identical - give or take - * a couple of bits. The only exception is the 5272 devices, their - * DRAM controller is quite different. - */ -.macro GET_MEM_SIZE - movel MCFSIM_DMR0,%d0 /* get mask for 1st bank */ - btst #0,%d0 /* check if region enabled */ - beq 1f - andl #0xfffc0000,%d0 - beq 1f - addl #0x00040000,%d0 /* convert mask to size */ -1: - movel MCFSIM_DMR1,%d1 /* get mask for 2nd bank */ - btst #0,%d1 /* check if region enabled */ - beq 2f - andl #0xfffc0000,%d1 - beq 2f - addl #0x00040000,%d1 - addl %d1,%d0 /* total mem size in d0 */ -2: -.endm - -#elif defined(CONFIG_M5272) -.macro GET_MEM_SIZE - movel MCF_MBAR+MCFSIM_CSOR7,%d0 /* get SDRAM address mask */ - andil #0xfffff000,%d0 /* mask out chip select options */ - negl %d0 /* negate bits */ -.endm - -#elif defined(CONFIG_M520x) -.macro GET_MEM_SIZE - clrl %d0 - movel MCFSIM_SDCS0, %d2 /* Get SDRAM chip select 0 config */ - andl #0x1f, %d2 /* Get only the chip select size */ - beq 3f /* Check if it is enabled */ - addql #1, %d2 /* Form exponent */ - moveql #1, %d0 - lsll %d2, %d0 /* 2 ^ exponent */ -3: - movel MCFSIM_SDCS1, %d2 /* Get SDRAM chip select 1 config */ - andl #0x1f, %d2 /* Get only the chip select size */ - beq 4f /* Check if it is enabled */ - addql #1, %d2 /* Form exponent */ - moveql #1, %d1 - lsll %d2, %d1 /* 2 ^ exponent */ - addl %d1, %d0 /* Total size of SDRAM in d0 */ -4: -.endm - -#else -#error "ERROR: I don't know how to probe your boards memory size?" -#endif - -/*****************************************************************************/ - -/* - * Boards and platforms can do specific early hardware setup if - * they need to. Most don't need this, define away if not required. - */ -#ifndef PLATFORM_SETUP -#define PLATFORM_SETUP -#endif - -/*****************************************************************************/ - -.global _start -.global _rambase -.global _ramvec -.global _ramstart -.global _ramend -#if defined(CONFIG_UBOOT) -.global _init_sp -#endif - -/*****************************************************************************/ - -.data - -/* - * During startup we store away the RAM setup. These are not in the - * bss, since their values are determined and written before the bss - * has been cleared. - */ -_rambase: -.long 0 -_ramvec: -.long 0 -_ramstart: -.long 0 -_ramend: -.long 0 -#if defined(CONFIG_UBOOT) -_init_sp: -.long 0 -#endif - -/*****************************************************************************/ - -__HEAD - -/* - * This is the codes first entry point. This is where it all - * begins... - */ - -_start: - nop /* filler */ - movew #0x2700, %sr /* no interrupts */ -#if defined(CONFIG_UBOOT) - movel %sp,_init_sp /* save initial stack pointer */ -#endif - - /* - * Do any platform or board specific setup now. Most boards - * don't need anything. Those exceptions are define this in - * their board specific includes. - */ - PLATFORM_SETUP - - /* - * Create basic memory configuration. Set VBR accordingly, - * and size memory. - */ - movel #CONFIG_VECTORBASE,%a7 - movec %a7,%VBR /* set vectors addr */ - movel %a7,_ramvec - - movel #CONFIG_RAMBASE,%a7 /* mark the base of RAM */ - movel %a7,_rambase - - GET_MEM_SIZE /* macro code determines size */ - addl %a7,%d0 - movel %d0,_ramend /* set end ram addr */ - - /* - * Now that we know what the memory is, lets enable cache - * and get things moving. This is Coldfire CPU specific. Not - * all version cores have identical cache register setup. But - * it is very similar. Define the exact settings in the headers - * then the code here is the same for all. - */ - movel #CACHE_INIT,%d0 /* invalidate whole cache */ - movec %d0,%CACR - nop - movel #ACR0_MODE,%d0 /* set RAM region for caching */ - movec %d0,%ACR0 - movel #ACR1_MODE,%d0 /* anything else to cache? */ - movec %d0,%ACR1 -#ifdef ACR2_MODE - movel #ACR2_MODE,%d0 - movec %d0,%ACR2 - movel #ACR3_MODE,%d0 - movec %d0,%ACR3 -#endif - movel #CACHE_MODE,%d0 /* enable cache */ - movec %d0,%CACR - nop - -#ifdef CONFIG_ROMFS_FS - /* - * Move ROM filesystem above bss :-) - */ - lea _sbss,%a0 /* get start of bss */ - lea _ebss,%a1 /* set up destination */ - movel %a0,%a2 /* copy of bss start */ - - movel 8(%a0),%d0 /* get size of ROMFS */ - addql #8,%d0 /* allow for rounding */ - andl #0xfffffffc, %d0 /* whole words */ - - addl %d0,%a0 /* copy from end */ - addl %d0,%a1 /* copy from end */ - movel %a1,_ramstart /* set start of ram */ - -_copy_romfs: - movel -(%a0),%d0 /* copy dword */ - movel %d0,-(%a1) - cmpl %a0,%a2 /* check if at end */ - bne _copy_romfs - -#else /* CONFIG_ROMFS_FS */ - lea _ebss,%a1 - movel %a1,_ramstart -#endif /* CONFIG_ROMFS_FS */ - - - /* - * Zero out the bss region. - */ - lea _sbss,%a0 /* get start of bss */ - lea _ebss,%a1 /* get end of bss */ - clrl %d0 /* set value */ -_clear_bss: - movel %d0,(%a0)+ /* clear each word */ - cmpl %a0,%a1 /* check if at end */ - bne _clear_bss - - /* - * Load the current task pointer and stack. - */ - lea init_thread_union,%a0 - lea THREAD_SIZE(%a0),%sp - - /* - * Assember start up done, start code proper. - */ - jsr start_kernel /* start Linux kernel */ - -_exit: - jmp _exit /* should never get here */ - -/*****************************************************************************/ |
