From f3acb02386f4d5df6e5b5eb96302f169c28933db Mon Sep 17 00:00:00 2001 From: Sherry Sun Date: Mon, 20 Jan 2020 11:13:14 +0800 Subject: drivers: ddr: imx8mp: Add inline ECC feature support the DRAM Controller in i.MX8MP will support a feature called "Inline ECC". This is supported for all 3 supported DRAM technologies (LPDDR4, DDR4 and DDR3L). When this feature is enabled by software, the DRAM Controller reserves 12.5% of DRAM capacity for ECC information, and presents only the non-ECC portion (lower 87.5% of the installed capacity of DRAM) to the rest of the SoC. The DRAM memory can be divided into 8 regions so that if a use case only requires ECC protection on a subset of memory, then only that subset of memory need support inline ECC. If this occurs, then there is no performance penalty accessing the non-ECC-protected memory (no need to access ECC for this portion of the memory map). This is all configured with the DRAM Controller. Signed-off-by: Sherry Sun Signed-off-by: Peng Fan --- drivers/ddr/imx/imx8m/Kconfig | 7 ++++ drivers/ddr/imx/imx8m/ddr_init.c | 72 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) (limited to 'drivers/ddr') diff --git a/drivers/ddr/imx/imx8m/Kconfig b/drivers/ddr/imx/imx8m/Kconfig index 5bf61eb258..a5f5524fbe 100644 --- a/drivers/ddr/imx/imx8m/Kconfig +++ b/drivers/ddr/imx/imx8m/Kconfig @@ -29,4 +29,11 @@ config SAVED_DRAM_TIMING_BASE info into memory for low power use. OCRAM_S is used for this purpose on i.MX8MM. default 0x180000 + +config IMX8M_DRAM_INLINE_ECC + bool "imx8mp inline ECC" + depends on IMX8MP && IMX8M_LPDDR4 + help + Select this config if you want to use inline ecc feature for + imx8mp-evk board. endmenu diff --git a/drivers/ddr/imx/imx8m/ddr_init.c b/drivers/ddr/imx/imx8m/ddr_init.c index de302937d0..664966c41b 100644 --- a/drivers/ddr/imx/imx8m/ddr_init.c +++ b/drivers/ddr/imx/imx8m/ddr_init.c @@ -21,6 +21,76 @@ void ddr_cfg_umctl2(struct dram_cfg_param *ddrc_cfg, int num) } } +#ifdef CONFIG_IMX8M_DRAM_INLINE_ECC +void ddrc_inline_ecc_scrub(unsigned int start_address, + unsigned int range_address) +{ + unsigned int tmp; + + /* Step1: Enable quasi-dynamic programming */ + reg32_write(DDRC_SWCTL(0), 0x00000000); + /* Step2: Set ECCCFG1.ecc_parity_region_lock to 1 */ + reg32setbit(DDRC_ECCCFG1(0), 0x4); + /* Step3: Block the AXI ports from taking the transaction */ + reg32_write(DDRC_PCTRL_0(0), 0x0); + /* Step4: Set scrub start address */ + reg32_write(DDRC_SBRSTART0(0), start_address); + /* Step5: Set scrub range address */ + reg32_write(DDRC_SBRRANGE0(0), range_address); + /* Step6: Set scrub_mode to write */ + reg32_write(DDRC_SBRCTL(0), 0x00000014); + /* Step7: Set the desired pattern through SBRWDATA0 registers */ + reg32_write(DDRC_SBRWDATA0(0), 0x55aa55aa); + /* Step8: Enable the SBR by programming SBRCTL.scrub_en=1 */ + reg32setbit(DDRC_SBRCTL(0), 0x0); + /* Step9: Poll SBRSTAT.scrub_done=1 */ + tmp = reg32_read(DDRC_SBRSTAT(0)); + while (tmp != 0x00000002) + tmp = reg32_read(DDRC_SBRSTAT(0)) & 0x2; + /* Step10: Poll SBRSTAT.scrub_busy=0 */ + tmp = reg32_read(DDRC_SBRSTAT(0)); + while (tmp != 0x0) + tmp = reg32_read(DDRC_SBRSTAT(0)) & 0x1; + /* Step11: Disable SBR by programming SBRCTL.scrub_en=0 */ + clrbits_le32(DDRC_SBRCTL(0), 0x1); + /* Step12: Prepare for normal scrub operation(Read) and set scrub_interval*/ + reg32_write(DDRC_SBRCTL(0), 0x100); + /* Step13: Enable the SBR by programming SBRCTL.scrub_en=1 */ + reg32_write(DDRC_SBRCTL(0), 0x101); + /* Step14: Enable AXI ports by programming */ + reg32_write(DDRC_PCTRL_0(0), 0x1); + /* Step15: Disable quasi-dynamic programming */ + reg32_write(DDRC_SWCTL(0), 0x00000001); +} + +void ddrc_inline_ecc_scrub_end(unsigned int start_address, + unsigned int range_address) +{ + /* Step1: Enable quasi-dynamic programming */ + reg32_write(DDRC_SWCTL(0), 0x00000000); + /* Step2: Block the AXI ports from taking the transaction */ + reg32_write(DDRC_PCTRL_0(0), 0x0); + /* Step3: Set scrub start address */ + reg32_write(DDRC_SBRSTART0(0), start_address); + /* Step4: Set scrub range address */ + reg32_write(DDRC_SBRRANGE0(0), range_address); + /* Step5: Disable SBR by programming SBRCTL.scrub_en=0 */ + clrbits_le32(DDRC_SBRCTL(0), 0x1); + /* Step6: Prepare for normal scrub operation(Read) and set scrub_interval */ + reg32_write(DDRC_SBRCTL(0), 0x100); + /* Step7: Enable the SBR by programming SBRCTL.scrub_en=1 */ + reg32_write(DDRC_SBRCTL(0), 0x101); + /* Step8: Enable AXI ports by programming */ + reg32_write(DDRC_PCTRL_0(0), 0x1); + /* Step9: Disable quasi-dynamic programming */ + reg32_write(DDRC_SWCTL(0), 0x00000001); +} +#endif + +void __weak board_dram_ecc_scrub(void) +{ +} + int ddr_init(struct dram_timing_info *dram_timing) { unsigned int tmp, initial_drate, target_freq; @@ -169,6 +239,8 @@ int ddr_init(struct dram_timing_info *dram_timing) reg32_write(DDRC_PCTRL_0(0), 0x00000001); debug("DDRINFO: ddrmix config done\n"); + board_dram_ecc_scrub(); + /* save the dram timing config into memory */ dram_config_save(dram_timing, CONFIG_SAVED_DRAM_TIMING_BASE); -- cgit v1.2.3