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ddr: altera: Add ECC DRAM scrubbing support for Arria10

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The SDRAM must first be rewritten by zeroes if ECC is used to initialize
the ECC metadata. Make the CPU overwrite the DRAM with zeroes in such a
case. This scrubbing implementation turns the caches on temporarily, then
overwrites the whole RAM with zeroes, flushes the caches and turns them
off again. This provides satisfactory performance.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
This commit is contained in:
Marek Vasut 2018-05-28 17:22:47 +02:00
parent 93a8ed8685
commit 07252f6f7e
1 changed files with 27 additions and 0 deletions
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27
drivers/ddr/altera/sdram_arria10.c
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@ -215,6 +215,30 @@ static int ddr_setup(void)
return 0;
}
static int sdram_is_ecc_enabled(void)
{
return !!(readl(&socfpga_ecc_hmc_base->eccctrl) &
ALT_ECC_HMC_OCP_ECCCTL_ECC_EN_SET_MSK);
}
/* Initialize SDRAM ECC bits to avoid false DBE */
static void sdram_init_ecc_bits(u32 size)
{
icache_enable();
memset(0, 0, 0x8000);
gd->arch.tlb_addr = 0x4000;
gd->arch.tlb_size = PGTABLE_SIZE;
dcache_enable();
printf("DDRCAL: Scrubbing ECC RAM (%i MiB).\n", size >> 20);
memset((void *)0x8000, 0, size - 0x8000);
flush_dcache_all();
printf("DDRCAL: Scrubbing ECC RAM done.\n");
dcache_disable();
}
/* Function to startup the SDRAM*/
static int sdram_startup(void)
{
@ -711,5 +735,8 @@ int ddr_calibration_sequence(void)
if (of_sdram_firewall_setup(gd->fdt_blob))
puts("FW: Error Configuring Firewall\n");
if (sdram_is_ecc_enabled())
sdram_init_ecc_bits(gd->ram_size);
return 0;
}