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/*
* (C) Copyright 2010
* Stefan Roese, DENX Software Engineering, sr@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/ppc4xx.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/cache.h>
#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR) || \
defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2)
#if defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC)
#if defined(CONFIG_405EX)
/*
* Currently only 405EX uses 16bit data bus width as an alternative
* option to 32bit data width (SDRAM0_MCOPT1_WDTH)
*/
#define SDRAM_DATA_ALT_WIDTH 2
#else
#define SDRAM_DATA_ALT_WIDTH 8
#endif
#if defined(CONFIG_SYS_OCM_BASE)
#define CONFIG_FUNC_ISRAM_ADDR CONFIG_SYS_OCM_BASE
#endif
#if defined(CONFIG_SYS_ISRAM_BASE)
#define CONFIG_FUNC_ISRAM_ADDR CONFIG_SYS_ISRAM_BASE
#endif
#if !defined(CONFIG_FUNC_ISRAM_ADDR)
#error "No internal SRAM/OCM provided!"
#endif
#define force_inline inline __attribute__ ((always_inline))
static inline void machine_check_disable(void)
{
mtmsr(mfmsr() & ~MSR_ME);
}
static inline void machine_check_enable(void)
{
mtmsr(mfmsr() | MSR_ME);
}
/*
* These helper functions need to be inlined, since they
* are called from the functions running from internal SRAM.
* SDRAM operation is forbidden at that time, so calling
* functions in SDRAM has to be avoided.
*/
static force_inline void wait_ddr_idle(void)
{
u32 val;
do {
mfsdram(SDRAM_MCSTAT, val);
} while ((val & SDRAM_MCSTAT_IDLE_MASK) == SDRAM_MCSTAT_IDLE_NOT);
}
static force_inline void recalibrate_ddr(void)
{
u32 val;
/*
* Rewrite RQDC & RFDC to calibrate again. If this is not
* done, the SDRAM controller is working correctly after
* changing the MCOPT1_MCHK bits.
*/
mfsdram(SDRAM_RQDC, val);
mtsdram(SDRAM_RQDC, val);
mfsdram(SDRAM_RFDC, val);
mtsdram(SDRAM_RFDC, val);
}
static force_inline void set_mcopt1_mchk(u32 bits)
{
u32 val;
wait_ddr_idle();
mfsdram(SDRAM_MCOPT1, val);
mtsdram(SDRAM_MCOPT1, (val & ~SDRAM_MCOPT1_MCHK_MASK) | bits);
recalibrate_ddr();
}
/*
* The next 2 functions are copied to internal SRAM/OCM and run
* there. No function calls allowed here. No SDRAM acitivity should
* be done here.
*/
static void inject_ecc_error(void *ptr, int par)
{
/*
* Taken from PPC460EX/EXr/GT users manual (Rev 1.21)
* 22.2.17.13 ECC Diagnostics
*
* Items 1 ... 5 are already done by now, running from RAM
* with ECC enabled
*/
out_be32(ptr, 0x00000000);
in_be32(ptr);
/* 6. Set memory controller to no error checking */
set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_NON);
/* 7. Modify one or two bits for error simulation */
if (par == 1)
out_be32(ptr, in_be32(ptr) ^ 0x00000001);
else
out_be32(ptr, in_be32(ptr) ^ 0x00000003);
/* 8. Wait for SDRAM idle */
in_be32(ptr);
set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_CHK_REP);
/* Wait for SDRAM idle */
wait_ddr_idle();
/* Continue with 9. in calling function... */
}
static void rewrite_ecc_parity(void *ptr, int par)
{
u32 current_address = (u32)ptr;
u32 end_address;
u32 address_increment;
u32 mcopt1;
/*
* Fill ECC parity byte again. Otherwise further accesses to
* the failure address will result in exceptions.
*/
/* Wait for SDRAM idle */
in_be32(0x00000000);
set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_GEN);
/* ECC bit set method for non-cached memory */
mfsdram(SDRAM_MCOPT1, mcopt1);
if ((mcopt1 & SDRAM_MCOPT1_DMWD_MASK) == SDRAM_MCOPT1_DMWD_32)
address_increment = 4;
else
address_increment = SDRAM_DATA_ALT_WIDTH;
end_address = current_address + CONFIG_SYS_CACHELINE_SIZE;
while (current_address < end_address) {
*((unsigned long *)current_address) = 0;
current_address += address_increment;
}
set_mcopt1_mchk(SDRAM_MCOPT1_MCHK_CHK_REP);
/* Wait for SDRAM idle */
wait_ddr_idle();
}
static int do_ecctest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
u32 old_val;
u32 val;
u32 *ptr;
void (*sram_func)(u32 *, int);
int error;
if (argc < 3) {
return cmd_usage(cmdtp);
}
ptr = (u32 *)simple_strtoul(argv[1], NULL, 16);
error = simple_strtoul(argv[2], NULL, 16);
if ((error < 1) || (error > 2)) {
return cmd_usage(cmdtp);
}
printf("Using address %p for %d bit ECC error injection\n",
ptr, error);
/*
* Save value to restore it later on
*/
old_val = in_be32(ptr);
/*
* Copy ECC injection function into internal SRAM/OCM
*/
sram_func = (void *)CONFIG_FUNC_ISRAM_ADDR;
memcpy((void *)CONFIG_FUNC_ISRAM_ADDR, inject_ecc_error, 0x10000);
/*
* Disable interrupts and exceptions before calling this
* function in internal SRAM/OCM
*/
disable_interrupts();
machine_check_disable();
eieio();
/*
* Jump to ECC simulation function in internal SRAM/OCM
*/
(*sram_func)(ptr, error);
/* 10. Read the corresponding address */
val = in_be32(ptr);
/*
* Read and print ECC status register/info:
* The faulting address is only known upon uncorrectable ECC
* errors.
*/
mfsdram(SDRAM_ECCES, val);
if (val & SDRAM_ECCES_CE)
printf("ECC: Correctable error\n");
if (val & SDRAM_ECCES_UE) {
printf("ECC: Uncorrectable error at 0x%02x%08x\n",
mfdcr(SDRAM_ERRADDULL), mfdcr(SDRAM_ERRADDLLL));
}
/*
* Clear pending interrupts/exceptions
*/
mtsdram(SDRAM_ECCES, 0xffffffff);
mtdcr(SDRAM_ERRSTATLL, 0xff000000);
set_mcsr(get_mcsr());
/* Now enable interrupts and exceptions again */
eieio();
machine_check_enable();
enable_interrupts();
/*
* The ECC parity byte need to be re-written for the
* corresponding address. Otherwise future accesses to it
* will result in exceptions.
*
* Jump to ECC parity generation function
*/
memcpy((void *)CONFIG_FUNC_ISRAM_ADDR, rewrite_ecc_parity, 0x10000);
(*sram_func)(ptr, 0);
/*
* Restore value in corresponding address
*/
out_be32(ptr, old_val);
return 0;
}
U_BOOT_CMD(
ecctest, 3, 0, do_ecctest,
"Test ECC by single and double error bit injection",
"address 1/2"
);
#endif /* defined(CONFIG_DDR_ECC) || defined(CONFIG_SDRAM_ECC) */
#endif /* defined(CONFIG_SDRAM_PPC4xx_IBM_DDR)... */