Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751386AbdFEX3y (ORCPT ); Mon, 5 Jun 2017 19:29:54 -0400 Received: from conuserg-10.nifty.com ([210.131.2.77]:32133 "EHLO conuserg-10.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751279AbdFEXZR (ORCPT ); Mon, 5 Jun 2017 19:25:17 -0400 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-10.nifty.com v55NMD5n004412 X-Nifty-SrcIP: [118.110.19.204] From: Masahiro Yamada To: linux-mtd@lists.infradead.org Cc: Enrico Jorns , Artem Bityutskiy , Dinh Nguyen , Boris Brezillon , Marek Vasut , Graham Moore , David Woodhouse , Masami Hiramatsu , Chuanxiao Dong , Jassi Brar , Masahiro Yamada , Cyrille Pitchen , linux-kernel@vger.kernel.org, Brian Norris , Richard Weinberger Subject: [PATCH v4 13/23] mtd: nand: denali: fix NAND_CMD_PARAM handling Date: Tue, 6 Jun 2017 08:21:52 +0900 Message-Id: <1496704922-12261-14-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1496704922-12261-1-git-send-email-yamada.masahiro@socionext.com> References: <1496704922-12261-1-git-send-email-yamada.masahiro@socionext.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6742 Lines: 223 NAND_CMD_PARAM is not working at all due to multiple bugs. [1] The command 0x90 issued instead of 0xec The command code 0x90 is hard-code as index_addr(denali, addr | 0, 0x90) So, Read ID (0x90) command is sent to the device instead of Read Parameter Page (0xec). [2] only first 8 bytes are read Even if [1] is fixed, the current implementation is problematic. The only first 8 bytes are read by MAP11 command, and put into the temporal buffer: for (i = 0; i < 8; i++) { index_addr_read_data(denali, addr | 2, &id); write_byte_to_buf(denali, id); } Obviously, this is not sufficient for NAND_CMD_PARAM; the ONFi parameters are 256-byte long. This is still insufficient. As you see in nand_flash_detect_onfi() reads out (256 * 3) bytes at maximum (Redundant Parameter Pages). However, changing the loop to for (i = 0; i < 768; i++) is a crazy idea. At the point of the chip->cmdfunc() call, we cannot know how many times chip->read_byte() will be called. So, pre-reading enough number of bytes in the chip->cmdfunc() is a design mistake. [3] no wait for R/B# The current code handles NAND_CMD_READID and NAND_CMD_PARAM in the same way, but this is also wrong. The difference between them is that Read ID command does not toggle R/B# whereas the Read Parameter Page command requires R/B#. Without the wait for R/B# interrupt, wrong data are retrieved. In order to fix those problems, data read cycle of the MAP11 command has been moved to chip->read_byte(). Data are read out as needed. Another good thing is early temporal buffer is not needed any more. The ugly devm_kzalloc()/devm_kfree() dance has been killed. Signed-off-by: Masahiro Yamada --- Changes in v4: None Changes in v3: None Changes in v2: - Newly added drivers/mtd/nand/denali.c | 95 +++++++++++++++-------------------------------- drivers/mtd/nand/denali.h | 2 - 2 files changed, 30 insertions(+), 67 deletions(-) diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c index 372c871..4d46202 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -85,28 +85,6 @@ static void index_addr(struct denali_nand_info *denali, iowrite32(data, denali->flash_mem + 0x10); } -/* Perform an indexed read of the device */ -static void index_addr_read_data(struct denali_nand_info *denali, - uint32_t address, uint32_t *pdata) -{ - iowrite32(address, denali->flash_mem); - *pdata = ioread32(denali->flash_mem + 0x10); -} - -/* - * We need to buffer some data for some of the NAND core routines. - * The operations manage buffering that data. - */ -static void reset_buf(struct denali_nand_info *denali) -{ - denali->buf.head = denali->buf.tail = 0; -} - -static void write_byte_to_buf(struct denali_nand_info *denali, uint8_t byte) -{ - denali->buf.buf[denali->buf.tail++] = byte; -} - /* Reset the flash controller */ static uint16_t denali_nand_reset(struct denali_nand_info *denali) { @@ -286,6 +264,15 @@ static void setup_ecc_for_xfer(struct denali_nand_info *denali, bool ecc_en, iowrite32(transfer_spare_flag, denali->flash_reg + TRANSFER_SPARE_REG); } +static uint8_t denali_read_byte(struct mtd_info *mtd) +{ + struct denali_nand_info *denali = mtd_to_denali(mtd); + + iowrite32(MODE_11 | BANK(denali->flash_bank) | 2, denali->flash_mem); + + return ioread32(denali->flash_mem + 0x10); +} + /* * sends a pipeline command operation to the controller. See the Denali NAND * controller's user guide for more information (section 4.2.3.6). @@ -828,17 +815,6 @@ static int denali_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip, return 0; } -static uint8_t denali_read_byte(struct mtd_info *mtd) -{ - struct denali_nand_info *denali = mtd_to_denali(mtd); - uint8_t result = 0xff; - - if (denali->buf.head < denali->buf.tail) - result = denali->buf.buf[denali->buf.head++]; - - return result; -} - static void denali_select_chip(struct mtd_info *mtd, int chip) { struct denali_nand_info *denali = mtd_to_denali(mtd); @@ -873,43 +849,40 @@ static void denali_cmdfunc(struct mtd_info *mtd, unsigned int cmd, int col, int page) { struct denali_nand_info *denali = mtd_to_denali(mtd); - uint32_t addr, id; - int i; + uint32_t addr, irq_status; + int wait_ready = 0; switch (cmd) { - case NAND_CMD_STATUS: - reset_buf(denali); - addr = MODE_11 | BANK(denali->flash_bank); - index_addr(denali, addr | 0, cmd); - index_addr_read_data(denali, addr | 2, &id); - write_byte_to_buf(denali, id); + case NAND_CMD_PARAM: + wait_ready = 1; break; + case NAND_CMD_STATUS: case NAND_CMD_READID: - case NAND_CMD_PARAM: - reset_buf(denali); - /* - * sometimes ManufactureId read from register is not right - * e.g. some of Micron MT29F32G08QAA MLC NAND chips - * So here we send READID cmd to NAND insteand - */ - addr = MODE_11 | BANK(denali->flash_bank); - index_addr(denali, addr | 0, 0x90); - index_addr(denali, addr | 1, col); - for (i = 0; i < 8; i++) { - index_addr_read_data(denali, addr | 2, &id); - write_byte_to_buf(denali, id); - } break; case NAND_CMD_RESET: reset_bank(denali); break; case NAND_CMD_READOOB: /* TODO: Read OOB data */ - break; + return; default: pr_err(": unsupported command received 0x%x\n", cmd); - break; + return; } + + denali_reset_irq(denali); + + addr = MODE_11 | BANK(denali->flash_bank); + index_addr(denali, addr | 0, cmd); + if (col != -1) + index_addr(denali, addr | 1, col); + + if (!wait_ready) + return; + + irq_status = denali_wait_for_irq(denali, INTR__INT_ACT); + if (!(irq_status & INTR__INT_ACT)) + dev_err(denali->dev, "failed to issue command 0x%x\n", cmd); } #define DIV_ROUND_DOWN_ULL(ll, d) \ @@ -1244,12 +1217,6 @@ int denali_init(struct denali_nand_info *denali) struct mtd_info *mtd = nand_to_mtd(chip); int ret; - /* allocate a temporary buffer for nand_scan_ident() */ - denali->buf.buf = devm_kzalloc(denali->dev, PAGE_SIZE, - GFP_DMA | GFP_KERNEL); - if (!denali->buf.buf) - return -ENOMEM; - mtd->dev.parent = denali->dev; denali_hw_init(denali); denali_drv_init(denali); @@ -1289,8 +1256,6 @@ int denali_init(struct denali_nand_info *denali) if (ret) goto disable_irq; - /* allocate the right size buffer now */ - devm_kfree(denali->dev, denali->buf.buf); denali->buf.buf = devm_kzalloc(denali->dev, mtd->writesize + mtd->oobsize, GFP_KERNEL); diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h index a46473a..54f21f4 100644 --- a/drivers/mtd/nand/denali.h +++ b/drivers/mtd/nand/denali.h @@ -306,8 +306,6 @@ #define MODE_11 0x0C000000 struct nand_buf { - int head; - int tail; uint8_t *buf; dma_addr_t dma_buf; }; -- 2.7.4