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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsARMTMS570
*
* @brief This source file contains the Parameter Overlay Module (POM) support
* implementation.
*/
/*
* Copyright (C) 2014 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <string.h>
#include <bsp/tms570-pom.h>
#include <bsp/linker-symbols.h>
#include <rtems/score/armv4.h>
#include <bsp.h>
/*
* Placement of exceptions target addresses in memory
* when insructions with opcode 0xe59ff018
* ldr pc, [pc, #0x18]
* are used to fill ARM exception vectors area
*/
typedef struct{
uint32_t reserved1;
uint32_t except_addr_undef;
uint32_t except_addr_swi;
uint32_t except_addr_prefetch;
uint32_t except_addr_abort;
uint32_t reserved2;
uint32_t except_addr_irq;
uint32_t except_addr_fiq;
}vec_remap_table;
void bsp_block_on_exception(void);
void bsp_block_on_exception(void){
while(1);
}
extern char bsp_int_vec_overlay_start[];
/*
* Global overlay target address holds shared MSB bits for all regions
* It is set to linker RAM_INT_VEC region - i.e. area reserved
* at internal SRAM memory start, address 0x08000000
*/
uint32_t pom_global_overlay_target_address_start =
(uintptr_t)bsp_int_vec_overlay_start;
/**
* @brief initialize and clear parameters overlay module (POM)
*
* clears all remap regions. The actual POM enable is left to the first user.
*
* @retval Void
*/
void tms570_initialize_and_clear(void)
{
int i;
TMS570_POM.GLBCTRL = 0 | (TMS570_POM_GLBCTRL_OTADDR(~0) &
pom_global_overlay_target_address_start);
for ( i = 0; i < TMS570_POM_REGIONS; ++i ) {
TMS570_POM.REG[i].REGSIZE = TMS570_POM_REGSIZE_SIZE(TMS570_POM_REGSIZE_DISABLED);
}
}
/**
* @brief remaps vector table
*
* transfer the rtems start vector table to address 0x0
*
* @retval Void
*/
void tms570_pom_remap(void)
{
void *vec_overlay_start = (void *) pom_global_overlay_target_address_start;
void *addr_tab = (char *) bsp_start_vector_table_begin + 64;
if (vec_overlay_start == addr_tab) {
return;
}
/*
* Copy RTEMS the first level exception processing code
* to RAM area which can be used for later as POM overlay
* of Flash vectors. The code is expected to have for of eight
* ldr pc, [pc,#0x18]
* instructions followed by eight words with actual exception
* service routines target addresses. This is case of RTEMS default
* table found in
* c/src/lib/libbsp/arm/shared/start/start.S
*/
rtems_cache_invalidate_multiple_data_lines(addr_tab, 64);
memcpy(vec_overlay_start, addr_tab, 64);
rtems_cache_flush_multiple_data_lines(vec_overlay_start, 64);
rtems_cache_invalidate_multiple_instruction_lines(vec_overlay_start, 64);
#if 0
{
/* Fill exception table by catch error infinite loop for debugging */
vec_remap_table* vec_table = (vec_remap_table*)(vec_overlay_start+32);
vec_table->except_addr_undef = (uint32_t)bsp_block_on_exception;
vec_table->except_addr_swi = (uint32_t)bsp_block_on_exception;
vec_table->except_addr_prefetch = (uint32_t)bsp_block_on_exception;//_ARMV4_Exception_prefetch_abort;
vec_table->except_addr_abort = (uint32_t)bsp_block_on_exception;//_ARMV4_Exception_data_abort;
vec_table->except_addr_irq = (uint32_t)_ARMV4_Exception_interrupt;
vec_table->except_addr_fiq = (uint32_t)bsp_block_on_exception;//_ARMV4_Exception_interrupt;
}
#endif
/*
* The overlay vectors replacement area cannot be used directly
* to replace jump instructions on start of Flash because instruction
* fetch through POM is not reliable supported (works in most times
* but sometimes fails).
* Area of 64 bytes starting at address 0x00000040 is replaced.
* This way target addresses are placed between 0x00000060
* and 0x0000007F. If boot loader startup code contains instructions
* ldr pc,[pc,#0x58]
* (opcode 0xe59ff058) then the jump target addresses are replaced
* by pointers to actual RTEMS exceptions service functions.
*/
TMS570_POM.REG[0].PROGSTART = TMS570_POM_PROGSTART_STARTADDRESS(64);
TMS570_POM.REG[0].OVLSTART = TMS570_POM_OVLSTART_STARTADDRESS(vec_overlay_start);
TMS570_POM.REG[0].REGSIZE = TMS570_POM_REGSIZE_SIZE(TMS570_POM_REGSIZE_64B);
TMS570_POM.GLBCTRL = TMS570_POM_GLBCTRL_ON_OFF(0xa) |
TMS570_POM_GLBCTRL_ETO(0xa) |
(TMS570_POM_GLBCTRL_OTADDR(~0) &
pom_global_overlay_target_address_start);
}
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