From patchwork Mon Mar 23 20:15:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pratyush Yadav X-Patchwork-Id: 1260260 X-Patchwork-Delegate: jagannadh.teki@gmail.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de (client-ip=85.214.62.61; helo=phobos.denx.de; envelope-from=u-boot-bounces@lists.denx.de; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=ti.com header.i=@ti.com header.a=rsa-sha256 header.s=ti-com-17Q1 header.b=D0Ctulbn; dkim-atps=neutral Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 48mQfm3s96z9sR4 for ; Tue, 24 Mar 2020 07:17:52 +1100 (AEDT) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 420DF81860; Mon, 23 Mar 2020 21:16:50 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (1024-bit key; unprotected) header.d=ti.com header.i=@ti.com header.b="D0Ctulbn"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 36A79817D0; Mon, 23 Mar 2020 21:15:56 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de X-Spam-Level: X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,SPF_HELO_NONE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.2 Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id D9AE4811FC for ; Mon, 23 Mar 2020 21:15:39 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=p.yadav@ti.com Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 02NKFchR072810; Mon, 23 Mar 2020 15:15:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1584994538; bh=csGkKwpXt7C0vy3/wk3GjBepVbz4M9Bl1791uM1WcHw=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=D0CtulbnFl5gykxzVoryQ6diWUvb3Pz+6jF3MyxhkMV/sSFwNkRbkwtAhDRH5MXu0 hykYqge8lq6YD+zoLQg6CQHykimvM1yJkBPAhs6Z+bCzzMY+QSh5obnt7pGj06YGpf fX3WPSqNrCeD8DwN6mvzuaQyaABULprYuBLA0grc= Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 02NKFcQR008840 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 23 Mar 2020 15:15:38 -0500 Received: from DFLE103.ent.ti.com (10.64.6.24) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Mon, 23 Mar 2020 15:15:38 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE103.ent.ti.com (10.64.6.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Mon, 23 Mar 2020 15:15:37 -0500 Received: from pratyush-OptiPlex-790.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 02NKFKEn092283; Mon, 23 Mar 2020 15:15:36 -0500 From: Pratyush Yadav To: Jagan Teki , Vignesh Raghavendra CC: Pratyush Yadav , , Sekhar Nori Subject: [PATCH v2 08/16] mtd: spi-nor-core: Rework hwcaps selection Date: Tue, 24 Mar 2020 01:45:10 +0530 Message-ID: <20200323201519.20341-9-p.yadav@ti.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200323201519.20341-1-p.yadav@ti.com> References: <20200323201519.20341-1-p.yadav@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.30rc1 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.102.2 at phobos.denx.de X-Virus-Status: Clean The spi-mem layer provides a spi_mem_supports_op() function to check whether a specific operation is supported by the controller or not. This is much more accurate than the hwcaps selection logic based on SPI_{RX,TX}_ flags. Rework the hwcaps selection logic to use spi_mem_supports_op() when nor->spimem != NULL. Based on the Linux commit c76f5089796a (mtd: spi-nor: Rework hwcaps selection for the spi-mem case, 2019-08-06) Based-on-patch-by: Boris Brezillon Signed-off-by: Pratyush Yadav --- drivers/mtd/spi/spi-nor-core.c | 168 +++++++++++++++++++++++++-------- include/linux/mtd/spi-nor.h | 14 +++ 2 files changed, 144 insertions(+), 38 deletions(-) diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index 88b19978ed..f324d3c483 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -2285,6 +2285,124 @@ static int spi_nor_hwcaps_pp2cmd(u32 hwcaps) ARRAY_SIZE(hwcaps_pp2cmd)); } +/** + * spi_nor_check_op - check if the operation is supported by controller + * @nor: pointer to a 'struct spi_nor' + * @op: pointer to op template to be checked + * + * Returns 0 if operation is supported, -ENOTSUPP otherwise. + */ +static int spi_nor_check_op(struct spi_nor *nor, + struct spi_mem_op *op) +{ + /* + * First test with 4 address bytes. The opcode itself might be a 3B + * addressing opcode but we don't care, because SPI controller + * implementation should not check the opcode, but just the sequence. + */ + op->addr.nbytes = 4; + if (!spi_mem_supports_op(nor->spi, op)) { + if (nor->mtd.size > SZ_16M) + return -ENOTSUPP; + + /* If flash size <= 16MB, 3 address bytes are sufficient */ + op->addr.nbytes = 3; + if (!spi_mem_supports_op(nor->spi, op)) + return -ENOTSUPP; + } + + return 0; +} + +/** + * spi_nor_check_readop - check if the read op is supported by controller + * @nor: pointer to a 'struct spi_nor' + * @read: pointer to op template to be checked + * + * Returns 0 if operation is supported, -ENOTSUPP otherwise. + */ +static int spi_nor_check_readop(struct spi_nor *nor, + const struct spi_nor_read_command *read) +{ + struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(read->opcode, 1), + SPI_MEM_OP_ADDR(3, 0, 1), + SPI_MEM_OP_DUMMY(0, 1), + SPI_MEM_OP_DATA_IN(0, NULL, 1)); + + op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(read->proto); + op.addr.buswidth = spi_nor_get_protocol_addr_nbits(read->proto); + op.data.buswidth = spi_nor_get_protocol_data_nbits(read->proto); + op.dummy.buswidth = op.addr.buswidth; + op.dummy.nbytes = (read->num_mode_clocks + read->num_wait_states) * + op.dummy.buswidth / 8; + + return spi_nor_check_op(nor, &op); +} + +/** + * spi_nor_check_pp - check if the page program op is supported by controller + * @nor: pointer to a 'struct spi_nor' + * @pp: pointer to op template to be checked + * + * Returns 0 if operation is supported, -ENOTSUPP otherwise. + */ +static int spi_nor_check_pp(struct spi_nor *nor, + const struct spi_nor_pp_command *pp) +{ + struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(pp->opcode, 1), + SPI_MEM_OP_ADDR(3, 0, 1), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_OUT(0, NULL, 1)); + + op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(pp->proto); + op.addr.buswidth = spi_nor_get_protocol_addr_nbits(pp->proto); + op.data.buswidth = spi_nor_get_protocol_data_nbits(pp->proto); + + return spi_nor_check_op(nor, &op); +} + +/** + * spi_nor_adjust_hwcaps - Find optimal Read/Write protocol based on SPI + * controller capabilities + * @nor: pointer to a 'struct spi_nor' + * @params: pointer to the 'struct spi_nor_flash_parameter' + * representing SPI NOR flash capabilities + * @hwcaps: pointer to resulting capabilities after adjusting + * according to controller and flash's capability + */ +static void +spi_nor_adjust_hwcaps(struct spi_nor *nor, + const struct spi_nor_flash_parameter *params, + u32 *hwcaps) +{ + unsigned int cap; + + /* DTR modes are not supported yet, mask them all. */ + *hwcaps &= ~SNOR_HWCAPS_DTR; + + /* X-X-X modes are not supported yet, mask them all. */ + *hwcaps &= ~SNOR_HWCAPS_X_X_X; + + for (cap = 0; cap < sizeof(*hwcaps) * BITS_PER_BYTE; cap++) { + int rdidx, ppidx; + + if (!(*hwcaps & BIT(cap))) + continue; + + rdidx = spi_nor_hwcaps_read2cmd(BIT(cap)); + if (rdidx >= 0 && + spi_nor_check_readop(nor, ¶ms->reads[rdidx])) + *hwcaps &= ~BIT(cap); + + ppidx = spi_nor_hwcaps_pp2cmd(BIT(cap)); + if (ppidx < 0) + continue; + + if (spi_nor_check_pp(nor, ¶ms->page_programs[ppidx])) + *hwcaps &= ~BIT(cap); + } +} + static int spi_nor_select_read(struct spi_nor *nor, const struct spi_nor_flash_parameter *params, u32 shared_hwcaps) @@ -2368,7 +2486,7 @@ static int spi_nor_default_setup(struct spi_nor *nor, const struct spi_nor_flash_parameter *params, const struct spi_nor_hwcaps *hwcaps) { - u32 ignored_mask, shared_mask; + u32 shared_mask; bool enable_quad_io; int err; @@ -2378,17 +2496,12 @@ static int spi_nor_default_setup(struct spi_nor *nor, */ shared_mask = hwcaps->mask & params->hwcaps.mask; - /* SPI n-n-n protocols are not supported yet. */ - ignored_mask = (SNOR_HWCAPS_READ_2_2_2 | - SNOR_HWCAPS_READ_4_4_4 | - SNOR_HWCAPS_READ_8_8_8 | - SNOR_HWCAPS_PP_4_4_4 | - SNOR_HWCAPS_PP_8_8_8); - if (shared_mask & ignored_mask) { - dev_dbg(nor->dev, - "SPI n-n-n protocols are not supported yet.\n"); - shared_mask &= ~ignored_mask; - } + /* + * When called from spi_nor_probe(), all caps are set and we need to + * discard some of them based on what the SPI controller actually + * supports (using spi_mem_supports_op()). + */ + spi_nor_adjust_hwcaps(nor, params, &shared_mask); /* Select the (Fast) Read command. */ err = spi_nor_select_read(nor, params, shared_mask); @@ -2483,12 +2596,12 @@ int spi_nor_scan(struct spi_nor *nor) struct spi_nor_flash_parameter params; const struct flash_info *info = NULL; struct mtd_info *mtd = &nor->mtd; - struct spi_nor_hwcaps hwcaps = { - .mask = SNOR_HWCAPS_READ | - SNOR_HWCAPS_READ_FAST | - SNOR_HWCAPS_PP, - }; struct spi_slave *spi = nor->spi; + /* + * Enable all caps by default. The core will mask them after + * checking what's really supported using spi_mem_supports_op(). + */ + const struct spi_nor_hwcaps hwcaps = { .mask = SNOR_HWCAPS_ALL }; int ret; /* Reset SPI protocol for all commands. */ @@ -2502,27 +2615,6 @@ int spi_nor_scan(struct spi_nor *nor) nor->setup = spi_nor_default_setup; - if (spi->mode & SPI_RX_OCTAL) { - hwcaps.mask |= SNOR_HWCAPS_READ_1_1_8; - - if (spi->mode & SPI_TX_OCTAL) - hwcaps.mask |= (SNOR_HWCAPS_READ_1_8_8 | - SNOR_HWCAPS_PP_1_1_8 | - SNOR_HWCAPS_PP_1_8_8); - } else if (spi->mode & SPI_RX_QUAD) { - hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4; - - if (spi->mode & SPI_TX_QUAD) - hwcaps.mask |= (SNOR_HWCAPS_READ_1_4_4 | - SNOR_HWCAPS_PP_1_1_4 | - SNOR_HWCAPS_PP_1_4_4); - } else if (spi->mode & SPI_RX_DUAL) { - hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2; - - if (spi->mode & SPI_TX_DUAL) - hwcaps.mask |= SNOR_HWCAPS_READ_1_2_2; - } - info = spi_nor_read_id(nor); if (IS_ERR_OR_NULL(info)) return -ENOENT; diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index eb5d2794f3..4a11999eeb 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -311,6 +311,20 @@ struct spi_nor_hwcaps { #define SNOR_HWCAPS_PP_1_8_8 BIT(21) #define SNOR_HWCAPS_PP_8_8_8 BIT(22) +#define SNOR_HWCAPS_X_X_X (SNOR_HWCAPS_READ_2_2_2 | \ + SNOR_HWCAPS_READ_4_4_4 | \ + SNOR_HWCAPS_READ_8_8_8 | \ + SNOR_HWCAPS_PP_4_4_4 | \ + SNOR_HWCAPS_PP_8_8_8) + +#define SNOR_HWCAPS_DTR (SNOR_HWCAPS_READ_1_1_1_DTR | \ + SNOR_HWCAPS_READ_1_2_2_DTR | \ + SNOR_HWCAPS_READ_1_4_4_DTR | \ + SNOR_HWCAPS_READ_1_8_8_DTR) + +#define SNOR_HWCAPS_ALL (SNOR_HWCAPS_READ_MASK | \ + SNOR_HWCAPS_PP_MASK) + struct spi_nor_read_command { u8 num_mode_clocks; u8 num_wait_states;