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arm: spear: Add command to switch between 1-bit HW ECC and SW BCH4

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This patch adds the "nandecc" command to switch between the SPEAr600 internal
1-bit HW ECC and the 4-bit SW BCH4 ECC. This can be needed to support NAND
chips with a stronger ECC than 1-bit, as on the x600. And to dynamically
switch between both ECC schemes for backwards compatibility.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Stefan Roese 2015-09-02 11:10:58 +02:00 committed by Tom Rini
parent 1a103c6caa
commit da53ba0219
2 changed files with 35 additions and 0 deletions
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34
arch/arm/cpu/arm926ejs/spear/cpu.c
View file

@ -83,3 +83,37 @@ int print_cpuinfo(void)
return 0;
}
#endif
#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_NAND_ECC_BCH)
static int do_switch_ecc(cmd_tbl_t *cmdtp, int flag, int argc,
char *const argv[])
{
if (argc != 2)
goto usage;
if (strncmp(argv[1], "hw", 2) == 0) {
/* 1-bit HW ECC */
printf("Switching to 1-bit HW ECC\n");
fsmc_nand_switch_ecc(1);
} else if (strncmp(argv[1], "bch4", 2) == 0) {
/* 4-bit SW ECC BCH4 */
printf("Switching to 4-bit SW ECC (BCH4)\n");
fsmc_nand_switch_ecc(4);
} else {
goto usage;
}
return 0;
usage:
printf("Usage: nandecc %s\n", cmdtp->usage);
return 1;
}
U_BOOT_CMD(
nandecc, 2, 0, do_switch_ecc,
"switch NAND ECC calculation algorithm",
"hw|bch4 - Switch between NAND hardware 1-bit HW and"
" 4-bit SW BCH\n"
);
#endif

1
arch/arm/include/asm/arch-spear/spr_misc.h
View file

@ -253,5 +253,6 @@ struct misc_regs {
#define SOC_SPEAR320 203
extern int get_socrev(void);
int fsmc_nand_switch_ecc(uint32_t eccstrength);
#endif