Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753964AbdGSLuI (ORCPT ); Wed, 19 Jul 2017 07:50:08 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:59104 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753073AbdGSLuG (ORCPT ); Wed, 19 Jul 2017 07:50:06 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 90692609C6 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=absahu@codeaurora.org From: Abhishek Sahu To: dwmw2@infradead.org, computersforpeace@gmail.com, boris.brezillon@free-electrons.com, marek.vasut@gmail.com, richard@nod.at, cyrille.pitchen@wedev4u.fr, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, andy.gross@linaro.org, architt@codeaurora.org, sricharan@codeaurora.org, Abhishek Sahu Subject: [PATCH v2 08/25] mtd: nand: qcom: reorganize nand page write Date: Wed, 19 Jul 2017 17:17:56 +0530 Message-Id: <1500464893-11352-9-git-send-email-absahu@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1500464893-11352-1-git-send-email-absahu@codeaurora.org> References: <1500464893-11352-1-git-send-email-absahu@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4572 Lines: 132 Each NAND page consist of multiple codewords. Following is sequence for NAND page write according to hardware guide. 1. Program Power-up configuration, page row, page column address and flash configuration registers. 2. Write NAND_FLASH_CMD followed by NANC_EXEC_CMD for each codeword. 3. Read NAND_FLASH_STATUS for each codeword. The step 1 should be done once for each page and step 2,3 should be done for each codeword. Currently, all the 3 steps are being done for each codeword which is wrong. Now this patch reorganizes page write functions to configure page specific register once and per codeword specific registers for each NAND ECC step. Signed-off-by: Abhishek Sahu --- drivers/mtd/nand/qcom_nandc.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/drivers/mtd/nand/qcom_nandc.c b/drivers/mtd/nand/qcom_nandc.c index 27ea594..5b71478 100644 --- a/drivers/mtd/nand/qcom_nandc.c +++ b/drivers/mtd/nand/qcom_nandc.c @@ -638,15 +638,24 @@ static void config_nand_single_cw_page_read(struct qcom_nand_controller *nandc) config_nand_cw_read(nandc); } -static void config_cw_write_pre(struct qcom_nand_controller *nandc) +/* + * Helper to prepare DMA descriptors used to configure registers needed for + * before writing a NAND page. + */ +static void config_nand_page_write(struct qcom_nand_controller *nandc) { - write_reg_dma(nandc, NAND_FLASH_CMD, 3); + write_reg_dma(nandc, NAND_ADDR0, 2); write_reg_dma(nandc, NAND_DEV0_CFG0, 3); write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1); } -static void config_cw_write_post(struct qcom_nand_controller *nandc) +/* + * Helper to prepare DMA descriptors for configuring registers + * before writing each codeword in NAND page. + */ +static void config_nand_cw_write(struct qcom_nand_controller *nandc) { + write_reg_dma(nandc, NAND_FLASH_CMD, 1); write_reg_dma(nandc, NAND_EXEC_CMD, 1); read_reg_dma(nandc, NAND_FLASH_STATUS, 1); @@ -1329,6 +1338,7 @@ static int qcom_nandc_write_page(struct mtd_info *mtd, struct nand_chip *chip, host->use_ecc = true; update_rw_regs(host, ecc->steps, false); + config_nand_page_write(nandc); for (i = 0; i < ecc->steps; i++) { int data_size, oob_size; @@ -1342,7 +1352,6 @@ static int qcom_nandc_write_page(struct mtd_info *mtd, struct nand_chip *chip, oob_size = ecc->bytes; } - config_cw_write_pre(nandc); write_data_dma(nandc, FLASH_BUF_ACC, data_buf, data_size); @@ -1360,7 +1369,7 @@ static int qcom_nandc_write_page(struct mtd_info *mtd, struct nand_chip *chip, oob_buf, oob_size); } - config_cw_write_post(nandc); + config_nand_cw_write(nandc); data_buf += data_size; oob_buf += oob_size; @@ -1393,6 +1402,7 @@ static int qcom_nandc_write_page_raw(struct mtd_info *mtd, host->use_ecc = false; update_rw_regs(host, ecc->steps, false); + config_nand_page_write(nandc); for (i = 0; i < ecc->steps; i++) { int data_size1, data_size2, oob_size1, oob_size2; @@ -1411,8 +1421,6 @@ static int qcom_nandc_write_page_raw(struct mtd_info *mtd, oob_size2 = host->ecc_bytes_hw + host->spare_bytes; } - config_cw_write_pre(nandc); - write_data_dma(nandc, reg_off, data_buf, data_size1); reg_off += data_size1; data_buf += data_size1; @@ -1428,7 +1436,7 @@ static int qcom_nandc_write_page_raw(struct mtd_info *mtd, write_data_dma(nandc, reg_off, oob_buf, oob_size2); oob_buf += oob_size2; - config_cw_write_post(nandc); + config_nand_cw_write(nandc); } ret = submit_descs(nandc); @@ -1478,10 +1486,10 @@ static int qcom_nandc_write_oob(struct mtd_info *mtd, struct nand_chip *chip, set_address(host, host->cw_size * (ecc->steps - 1), page); update_rw_regs(host, 1, false); - config_cw_write_pre(nandc); + config_nand_page_write(nandc); write_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer, data_size + oob_size); - config_cw_write_post(nandc); + config_nand_cw_write(nandc); ret = submit_descs(nandc); @@ -1563,9 +1571,9 @@ static int qcom_nandc_block_markbad(struct mtd_info *mtd, loff_t ofs) set_address(host, host->cw_size * (ecc->steps - 1), page); update_rw_regs(host, 1, false); - config_cw_write_pre(nandc); + config_nand_page_write(nandc); write_data_dma(nandc, FLASH_BUF_ACC, nandc->data_buffer, host->cw_size); - config_cw_write_post(nandc); + config_nand_cw_write(nandc); ret = submit_descs(nandc); -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation