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Tue, 9 Apr 2019 11:28:42 -0500 Received: from DLEE107.ent.ti.com (157.170.170.37) by DLEE112.ent.ti.com (157.170.170.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 9 Apr 2019 11:28:41 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE107.ent.ti.com (157.170.170.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Tue, 9 Apr 2019 11:28:41 -0500 Received: from a0132425.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id x39GSVQE128531; Tue, 9 Apr 2019 11:28:39 -0500 From: Vignesh Raghavendra To: Boris Brezillon , Marek Vasut , Richard Weinberger , Tudor Ambarus Subject: [PATCH 2/2] mtd: spi-nor: Rework hwcaps selection for the spi-mem case Date: Tue, 9 Apr 2019 21:56:51 +0530 Message-ID: <20190409162651.24593-3-vigneshr@ti.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190409162651.24593-1-vigneshr@ti.com> References: <20190409162651.24593-1-vigneshr@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190409_092849_177360_3ABF301D X-CRM114-Status: GOOD ( 23.08 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yogesh Narayan Gaur , Vignesh Raghavendra , linux-kernel@vger.kernel.org, Frieder Schrempf , linux-mtd@lists.infradead.org, Miquel Raynal Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org From: Boris Brezillon 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. Signed-off-by: Boris Brezillon Signed-off-by: Vignesh Raghavendra --- Chagnes wrt RFC: Fix checkpatch issues Rebase onto latest drivers/mtd/spi-nor/spi-nor.c | 164 ++++++++++++++++++++++++++-------- include/linux/mtd/spi-nor.h | 14 +++ 2 files changed, 142 insertions(+), 36 deletions(-) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 03c8c346c9ae..d48ae3c9661d 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -2852,6 +2852,110 @@ static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr, return ret; } +static int spi_nor_spimem_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; + + /* + * First test with 3 address bytes. The opcode itself might already + * be a 4B addressing opcode but we don't care, because SPI controller + * implementation should not check the opcode, but just the sequence. + */ + if (!spi_mem_supports_op(nor->spimem, &op)) + return -ENOTSUPP; + + /* Now test with 4 address bytes. */ + op.addr.nbytes = 4; + if (!spi_mem_supports_op(nor->spimem, &op)) + return -ENOTSUPP; + + return 0; +} + +static int spi_nor_spimem_check_progop(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); + + /* + * First test with 3 address bytes. The opcode itself might already + * be a 4B addressing opcode but we don't care, because SPI controller + * implementation should not check the opcode, but just the sequence. + */ + if (!spi_mem_supports_op(nor->spimem, &op)) + return -ENOTSUPP; + + /* Now test with 4 address bytes. */ + op.addr.nbytes = 4; + if (!spi_mem_supports_op(nor->spimem, &op)) + return -ENOTSUPP; + + return 0; +} + +static void +spi_nor_spimem_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; + + /* Start with read commands. */ + for (cap = 0; cap < 32; cap++) { + int idx; + + if (!(*hwcaps & BIT(cap))) + continue; + + idx = spi_nor_hwcaps_read2cmd(BIT(cap)); + if (idx < 0) + continue; + + if (spi_nor_spimem_check_readop(nor, ¶ms->reads[idx])) + *hwcaps &= ~BIT(cap); + } + + /* Now check program commands. */ + for (cap = 0; cap < 32; cap++) { + int idx; + + if (!(*hwcaps & BIT(cap))) + continue; + + idx = spi_nor_hwcaps_pp2cmd(BIT(cap)); + if (idx < 0) + continue; + + if (spi_nor_spimem_check_progop(nor, + ¶ms->page_programs[idx])) + *hwcaps &= ~BIT(cap); + } +} + /** * spi_nor_read_sfdp_dma_unsafe() - read Serial Flash Discoverable Parameters. * @nor: pointer to a 'struct spi_nor' @@ -4259,16 +4363,25 @@ static int spi_nor_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; + if (nor->spimem) { + /* + * 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_spimem_adjust_hwcaps(nor, params, &shared_mask); + } else { + /* + * SPI n-n-n protocols are not supported when the SPI + * controller directly implements the spi_nor interface. + * Yet another reason to switch to spi-mem. + */ + ignored_mask = SNOR_HWCAPS_X_X_X; + if (shared_mask & ignored_mask) { + dev_dbg(nor->dev, + "SPI n-n-n protocols are not supported.\n"); + shared_mask &= ~ignored_mask; + } } /* Select the (Fast) Read command. */ @@ -4591,11 +4704,11 @@ static int spi_nor_probe(struct spi_mem *spimem) struct spi_device *spi = spimem->spi; struct flash_platform_data *data; struct spi_nor *nor; - struct spi_nor_hwcaps hwcaps = { - .mask = SNOR_HWCAPS_READ | - SNOR_HWCAPS_READ_FAST | - SNOR_HWCAPS_PP, - }; + /* + * Enable all caps by default. The core will mask them after + * checking what's really supported using spi_mem_supports_op(). + */ + struct spi_nor_hwcaps hwcaps = { .mask = SNOR_HWCAPS_ALL }; char *flash_name; int ret; @@ -4624,27 +4737,6 @@ static int spi_nor_probe(struct spi_mem *spimem) spi_mem_set_drvdata(spimem, nor); - 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; - } - if (data && data->name) nor->mtd.name = data->name; diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index ac16745f5ef8..1d56c437f553 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -523,6 +523,20 @@ 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) + /** * spi_nor_scan() - scan the SPI NOR * @nor: the spi_nor structure -- 2.21.0 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/