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4a7d216084
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@68 42af7a65-404d-4744-a932-0658087f49c3
227 lines
8.4 KiB
C
227 lines
8.4 KiB
C
/************************************************************************************
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* up_boot.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include "up_internal.h"
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#include "dm320.h"
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/************************************************************************************
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* Private Types
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************************************************************************************/
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/************************************************************************************
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* Private Types
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************************************************************************************/
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struct section_mapping_s
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{
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uint32 physbase; /* Physical address of the region to be mapped */
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uint32 virtbase; /* Virtual address of the region to be mapped */
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uint32 mmuflags; /* MMU settings for the region (e.g., cache-able) */
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uint32 nsections; /* Number of mappings in the region */
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};
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/************************************************************************************
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* Public Variables
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************************************************************************************/
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extern uint32 _vector_start; /* Beginning of vector block */
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extern uint32 _vector_end; /* End+1 of vector block */
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/************************************************************************************
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* Private Variables
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************************************************************************************/
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static const struct section_mapping_s section_mapping[] =
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{
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{ DM320_PERIPHERALS_PSECTION, DM320_PERIPHERALS_VSECTION,
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DM320_PERIPHERALS_MMUFLAGS, DM320_PERIPHERALS_NSECTIONS},
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{ DM320_FLASH_PSECTION, DM320_FLASH_VSECTION,
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DM320_FLASH_MMUFLAGS, DM320_FLASH_NSECTIONS},
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{ DM320_CFI_PSECTION, DM320_CFI_VSECTION,
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DM320_CFI_MMUFLAGS, DM320_CFI_NSECTIONS},
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{ DM320_SSFDC_PSECTION, DM320_SSFDC_VSECTION,
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DM320_SSFDC_MMUFLAGS, DM320_SSFDC_NSECTIONS},
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{ DM320_CE1_PSECTION, DM320_CE1_VSECTION,
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DM320_CE1_MMUFLAGS, DM320_CE1_NSECTIONS},
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{ DM320_CE2_PSECTION, DM320_CE2_VSECTION,
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DM320_CE2_MMUFLAGS, DM320_CE2_NSECTIONS},
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{ DM320_VLYNQ_PSECTION, DM320_VLYNQ_VSECTION,
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DM320_VLYNQ_MMUFLAGS, DM320_VLYNQ_NSECTIONS},
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{ DM320_USBOTG_PSECTION, DM320_USBOTG_VSECTION,
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DM320_USBOTG_MMUFLAGS, DM320_USBOTG_NSECTIONS}
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};
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#define NMAPPINGS (sizeof(section_mapping) / sizeof(struct section_mapping_s))
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Name: up_setlevel1entry
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************************************************************************************/
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static inline void up_setlevel1entry(uint32 paddr, uint32 vaddr, uint32 mmuflags)
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{
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uint32 *pgtable = (uint32*)PGTABLE_BASE_VADDR;
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uint32 index = vaddr >> 20;
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/* Save the page table entry */
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pgtable[index] = (paddr | mmuflags);
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}
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/************************************************************************************
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* Name: up_setlevel2coarseentry
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************************************************************************************/
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static inline void up_setlevel2coarseentry(uint32 ctabvaddr, uint32 paddr,
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uint32 vaddr, uint32 mmuflags)
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{
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uint32 *ctable = (uint32*)ctabvaddr;
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uint32 index;
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/* The coarse table divides a 1Mb address space up into 256 entries, each
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* corresponding to 4Kb of address space. The coarse page table index is
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* related to the offset from the beginning of 1Mb region.
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*/
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index = (vaddr & 0x000ff000) >> 12;
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/* Save the coarse table entry */
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ctable[index] = (paddr | mmuflags);
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}
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/************************************************************************************
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* Name: up_setupmappings
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************************************************************************************/
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static void up_setupmappings(void)
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{
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int i, j;
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for (i = 0; i < NMAPPINGS; i++)
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{
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uint32 sect_paddr = section_mapping[i].physbase;
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uint32 sect_vaddr = section_mapping[i].virtbase;
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uint32 mmuflags = section_mapping[i].mmuflags;
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for (j = 0; j < section_mapping[i].nsections; j++)
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{
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up_setlevel1entry(sect_paddr, sect_vaddr, mmuflags);
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sect_paddr += SECTION_SIZE;
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sect_vaddr += SECTION_SIZE;
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}
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}
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}
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/************************************************************************************
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* Name: up_vectormapping
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************************************************************************************/
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static void up_vectormapping(void)
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{
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uint32 vector_paddr = DM320_IRAM_PADDR;
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uint32 vector_vaddr = DM320_VECTOR_VADDR;
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uint32 end_paddr = vector_paddr + DM320_IRAM_SIZE;
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/* We want to keep our interrupt vectors and interrupt-related logic in zero-wait
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* state internal RAM (IRAM). The DM320 has 16Kb of IRAM positioned at physical
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* address 0x0000:0000; we need to map this to 0xffff:0000.
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*/
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while (vector_paddr < end_paddr)
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{
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up_setlevel2coarseentry(PGTABLE_COARSE_BASE_VADDR,
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vector_paddr,
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vector_vaddr,
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MMU_L2_VECTORFLAGS);
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vector_paddr += 4096;
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vector_vaddr += 4096;
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}
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/* Now set the level 1 descriptor to refer to the level 2 coarse page table. */
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up_setlevel1entry(PGTABLE_COARSE_BASE_PADDR,
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DM320_VECTOR_VCOARSE,
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MMU_L1_VECTORFLAGS);
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}
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/************************************************************************************
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* Name: up_copyvectorblock
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************************************************************************************/
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static void up_copyvectorblock(void)
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{
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uint32 *src = (uint32*)&_vector_start;
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uint32 *end = (uint32*)&_vector_end;
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uint32 *dest = (uint32*)VECTOR_BASE;
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while (src < end)
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{
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*dest++ = *src++;
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}
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}
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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void up_boot(void)
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{
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/* __start provided the basic MMU mappings for SDRAM. Now provide mappings for all
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* IO regions (Including the vector region).
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*/
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up_setupmappings();
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/* Provide a special mapping for the IRAM interrupt vector positioned in high
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* memory.
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*/
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up_vectormapping();
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/* Setup up vector block. _vector_start and _vector_end are exported from
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* up_vector.S
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*/
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up_copyvectorblock();
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}
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