From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 04 Mar 2026 12:24:38 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vxkLF-007xxA-2J for lore@lore.pengutronix.de; Wed, 04 Mar 2026 12:24:38 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1vxkLF-0002a0-Qv for lore@pengutronix.de; Wed, 04 Mar 2026 12:24:38 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=TX+xrLk0GY/Ps9Gv2E+xSAgwT3xYxd5rStCMKxkhLsw=; b=SZw0bi8wbzqlULi5cFUlIZWkwe 7kQG0gMH+LLW3KgbDfujMR3DL/y895c7me/hhUCreApN8RXWNH+W3KtHrDof8u00YXUTpslcg0le4 J6PQUWmk7GVj06oKaBVqsSQ23E6D/k5U5VDPpMgRFar+lh8ooO4PNvBHnAlZYWvYqfaPrbC5SnHgz QHLf7DbUPXE9jCgGu1XzgzhZOrDsQNGdWiDwp5Y+Shp79e2Hm6KuzLpuukiZqLgz1vAw0o97vioIB sKdg/PKFVn+s9vOhIn0N+tMStbSaUYkaukbxvNfhOLQUTREBoWMc1k7y8NzuC5P3iz5diUoczOzMH sh8neyiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vxkKq-0000000H5I0-2fMS; Wed, 04 Mar 2026 11:24:12 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vxkKn-0000000H5F1-0Dsa for barebox@lists.infradead.org; Wed, 04 Mar 2026 11:24:11 +0000 Received: from ptz.office.stw.pengutronix.de ([2a0a:edc0:0:900:1d::77] helo=ratatoskr.trumtrar.info) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1vxkKk-0002He-B5; Wed, 04 Mar 2026 12:24:06 +0100 From: Steffen Trumtrar Date: Wed, 04 Mar 2026 12:23:44 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260304-v2026-02-0-topic-imx8-ecc-v1-3-700698530c5c@pengutronix.de> References: <20260304-v2026-02-0-topic-imx8-ecc-v1-0-700698530c5c@pengutronix.de> In-Reply-To: <20260304-v2026-02-0-topic-imx8-ecc-v1-0-700698530c5c@pengutronix.de> To: barebox@lists.infradead.org, Sascha Hauer Cc: Steffen Trumtrar , David Jander X-Mailer: b4 0.14.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260304_032409_098446_8E56005A X-CRM114-Status: GOOD ( 12.76 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.7 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 3/4] drivers: ddr: imx8m: ddr_init.c: support ECC scrubbing X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) From: David Jander This code comes from u-boot [1] and was introducesd in commit [2]. A fix from the patch [3] is also included, which doesn't seem to be added to u-boot, yet. [1] https://github.com/u-boot/u-boot/ [2] commit f3acb02386f4 ("drivers: ddr: imx8mp: Add inline ECC feature support") [3] https://patchwork.ozlabs.org/project/uboot/patch/20230123091702.7472-32-peng.fan@oss.nxp.com/ Signed-off-by: David Jander Signed-off-by: Steffen Trumtrar --- arch/arm/mach-imx/Kconfig | 8 +++++ drivers/ddr/imx/imx8m_ddr_init.c | 73 ++++++++++++++++++++++++++++++++++++++++ include/soc/imx8m/ddr.h | 11 ++++++ 3 files changed, 92 insertions(+) diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig index d244c57580..75b04cf70f 100644 --- a/arch/arm/mach-imx/Kconfig +++ b/arch/arm/mach-imx/Kconfig @@ -1026,6 +1026,14 @@ config HABV3_IMG_CRT_DER endif +config IMX8MP_DRAM_ECC + bool "Enable LPDDR4 ECC feature on i.MX8MP boards" + depends on ARCH_IMX8MP + help + The i.MX8MP SoC supports ECC on the LPDDR4 memory. Select Y to enable + this feature. The total amount of memory available will be reduced by + 1/8th. + endmenu endif diff --git a/drivers/ddr/imx/imx8m_ddr_init.c b/drivers/ddr/imx/imx8m_ddr_init.c index c16e04d274..6398a2b971 100644 --- a/drivers/ddr/imx/imx8m_ddr_init.c +++ b/drivers/ddr/imx/imx8m_ddr_init.c @@ -45,6 +45,74 @@ static void ddr_cfg_umctl2(struct dram_controller *dram, struct dram_cfg_param * } } +#ifdef CONFIG_IMX8MP_DRAM_ECC +void ddrc_inline_ecc_scrub(unsigned int start_address, + unsigned int range_address) +{ + unsigned int tmp; + + pr_debug("ECC scrub %08x-%08x\n", start_address, range_address); + /* 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), 0xff20); + /* Step13: Enable the SBR by programming SBRCTL.scrub_en=1 */ + reg32_write(DDRC_SBRCTL(0), 0xff21); + /* 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) +{ + pr_debug("ECC end %08x-%08x\n", start_address, 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 + static unsigned int g_cdd_rr_max[4]; static unsigned int g_cdd_rw_max[4]; static unsigned int g_cdd_wr_max[4]; @@ -642,6 +710,11 @@ int imx8m_ddr_init(struct dram_controller *dram, struct dram_timing_info *dram_t reg32_write(DDRC_PCTRL_0(0), 0x00000001); pr_debug("ddrmix config done\n"); +#ifdef CONFIG_IMX8MP_DRAM_ECC + if (dram->ddrc_type == DDRC_TYPE_MP) + board_dram_ecc_scrub(); +#endif + /* save the dram timing config into memory */ dram_config_save(dram, dram_timing, IMX8M_SAVED_DRAM_TIMING_BASE); diff --git a/include/soc/imx8m/ddr.h b/include/soc/imx8m/ddr.h index 5df07772b3..08ebf61da0 100644 --- a/include/soc/imx8m/ddr.h +++ b/include/soc/imx8m/ddr.h @@ -186,6 +186,8 @@ #define DDRC_SBRWDATA0(X) (DDRC_IPS_BASE_ADDR(X) + 0xf2c) #define DDRC_SBRWDATA1(X) (DDRC_IPS_BASE_ADDR(X) + 0xf30) #define DDRC_PDCH(X) (DDRC_IPS_BASE_ADDR(X) + 0xf34) +#define DDRC_SBRSTART0(X) (DDRC_IPS_BASE_ADDR(X) + 0xf38) +#define DDRC_SBRRANGE0(X) (DDRC_IPS_BASE_ADDR(X) + 0xf40) #define DDRC_FREQ1_DERATEEN(X) (DDRC_IPS_BASE_ADDR(X) + 0x2020) #define DDRC_FREQ1_DERATEINT(X) (DDRC_IPS_BASE_ADDR(X) + 0x2024) @@ -380,4 +382,13 @@ static inline void imx8m_ddr_load_train_code(enum dram_type dram_type, ddr_load_train_code(&imx8m_dram_controller, dram_type, fw_type); } +#define DDRC_PHY_REG(x) ((x) * 4) + +void board_dram_ecc_scrub(void); + +void ddrc_inline_ecc_scrub(unsigned int start_address, + unsigned int range_address); +void ddrc_inline_ecc_scrub_end(unsigned int start_address, + unsigned int range_address); + #endif -- 2.52.0