From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailout.micron.com ([137.201.242.129]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1coP1a-0008TK-RT for linux-mtd@lists.infradead.org; Thu, 16 Mar 2017 06:36:40 +0000 From: Peter Pan To: , , , , , CC: , , Subject: [PATCH v3 7/8] nand: spi: Add generic SPI controller support Date: Thu, 16 Mar 2017 14:47:36 +0800 Message-ID: <1489646857-10112-8-git-send-email-peterpandong@micron.com> In-Reply-To: <1489646857-10112-1-git-send-email-peterpandong@micron.com> References: <1489646857-10112-1-git-send-email-peterpandong@micron.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This commit supports to use generic spi controller as spi nand controller. Signed-off-by: Peter Pan --- drivers/mtd/nand/spi/Kconfig | 2 + drivers/mtd/nand/spi/Makefile | 1 + drivers/mtd/nand/spi/controllers/Kconfig | 5 + drivers/mtd/nand/spi/controllers/Makefile | 1 + drivers/mtd/nand/spi/controllers/generic-spi.c | 158 +++++++++++++++++++++++++ 5 files changed, 167 insertions(+) create mode 100644 drivers/mtd/nand/spi/controllers/Kconfig create mode 100644 drivers/mtd/nand/spi/controllers/Makefile create mode 100644 drivers/mtd/nand/spi/controllers/generic-spi.c diff --git a/drivers/mtd/nand/spi/Kconfig b/drivers/mtd/nand/spi/Kconfig index d77c46e..6bd1c65 100644 --- a/drivers/mtd/nand/spi/Kconfig +++ b/drivers/mtd/nand/spi/Kconfig @@ -3,3 +3,5 @@ menuconfig MTD_SPI_NAND depends on MTD_NAND help This is the framework for the SPI NAND device drivers. + +source "drivers/mtd/nand/spi/controllers/Kconfig" diff --git a/drivers/mtd/nand/spi/Makefile b/drivers/mtd/nand/spi/Makefile index db0b91b..6ad5f24 100644 --- a/drivers/mtd/nand/spi/Makefile +++ b/drivers/mtd/nand/spi/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_MTD_SPI_NAND) += core.o obj-$(CONFIG_MTD_SPI_NAND) += manufactures.o obj-$(CONFIG_MTD_SPI_NAND) += micron.o +obj-$(CONFIG_MTD_SPI_NAND) += controllers/ diff --git a/drivers/mtd/nand/spi/controllers/Kconfig b/drivers/mtd/nand/spi/controllers/Kconfig new file mode 100644 index 0000000..8ab7023 --- /dev/null +++ b/drivers/mtd/nand/spi/controllers/Kconfig @@ -0,0 +1,5 @@ +config GENERIC_SPI_NAND + tristate "SPI NAND with generic SPI bus Support" + depends on MTD_SPI_NAND && SPI + help + This is to support SPI NAND device with generic SPI bus. diff --git a/drivers/mtd/nand/spi/controllers/Makefile b/drivers/mtd/nand/spi/controllers/Makefile new file mode 100644 index 0000000..46cbf29 --- /dev/null +++ b/drivers/mtd/nand/spi/controllers/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_GENERIC_SPI_NAND) += generic-spi.o diff --git a/drivers/mtd/nand/spi/controllers/generic-spi.c b/drivers/mtd/nand/spi/controllers/generic-spi.c new file mode 100644 index 0000000..38b4a56 --- /dev/null +++ b/drivers/mtd/nand/spi/controllers/generic-spi.c @@ -0,0 +1,158 @@ +/* + * Copyright (c) 2009-2017 Micron Technology, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include +#include +#include +#include +#include + +/* + * generic_spinand_cmd_fn - to process a command to send to the SPI NAND + * by generic SPI bus + * @chip: SPI NAND device structure + * @op: SPI NAND operation descriptor + */ +static int generic_spinand_cmd_fn(struct spinand_device *chip, + struct spinand_op *op) +{ + struct spi_message message; + struct spi_transfer x[3]; + struct spi_device *spi = spinand_get_controller_data(chip); + + spi_message_init(&message); + memset(x, 0, sizeof(x)); + x[0].len = 1; + x[0].tx_nbits = 1; + x[0].tx_buf = &op->cmd; + spi_message_add_tail(&x[0], &message); + + if (op->n_addr + op->dummy_bytes) { + x[1].len = op->n_addr + op->dummy_bytes; + x[1].tx_nbits = op->addr_nbits; + x[1].tx_buf = op->addr; + spi_message_add_tail(&x[1], &message); + } + if (op->n_tx) { + x[2].len = op->n_tx; + x[2].tx_nbits = op->data_nbits; + x[2].tx_buf = op->tx_buf; + spi_message_add_tail(&x[2], &message); + } else if (op->n_rx) { + x[2].len = op->n_rx; + x[2].rx_nbits = op->data_nbits; + x[2].rx_buf = op->rx_buf; + spi_message_add_tail(&x[2], &message); + } + return spi_sync(spi, &message); +} + +static struct spinand_controller_ops generic_spi_ops = { + .exec_op = generic_spinand_cmd_fn, +}; + +static int generic_spinand_probe(struct spi_device *spi) +{ + struct spinand_device *chip; + struct mtd_info *mtd; + struct spinand_controller *controller; + struct spinand_ecc_engine *ecc_engine; + int ret; + u32 max_speed_hz = spi->max_speed_hz; + + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (!chip) { + ret = -ENOMEM; + goto err1; + } + mtd = spinand_to_mtd(chip); + controller = kzalloc(sizeof(*controller), GFP_KERNEL); + if (!controller) { + ret = -ENOMEM; + goto err2; + } + controller->ops = &generic_spi_ops; + controller->caps = SPINAND_CAP_RD_X1 | SPINAND_CAP_WR_X1; + if (spi->mode & SPI_RX_QUAD) + controller->caps |= SPINAND_CAP_RD_QUAD | SPINAND_CAP_RD_X4; + if (spi->mode & SPI_RX_DUAL) + controller->caps |= SPINAND_CAP_RD_DUAL | SPINAND_CAP_RD_X2; + if (spi->mode & SPI_TX_QUAD) + controller->caps |= SPINAND_CAP_WR_QUAD | SPINAND_CAP_WR_X4; + if (spi->mode & SPI_TX_DUAL) + controller->caps |= SPINAND_CAP_WR_DUAL | SPINAND_CAP_WR_X2; + chip->controller = controller; + ecc_engine = kzalloc(sizeof(*ecc_engine), GFP_KERNEL); + if (!ecc_engine) { + ret = -ENOMEM; + goto err3; + } + ecc_engine->mode = SPINAND_ECC_ONDIE; + chip->ecc.engine = ecc_engine; + spinand_set_controller_data(chip, spi); + spi_set_drvdata(spi, chip); + spi->max_speed_hz = min_t(int, 25000000, max_speed_hz); + ret = spinand_detect(chip); + if (ret) + goto err4; + + spi->max_speed_hz = max_speed_hz; + ret = spinand_init(chip); + if (ret) + goto err5; + + mtd_set_of_node(mtd, spi->dev.of_node); + + ret = mtd_device_register(mtd, NULL, 0); + if (!ret) + return 0; + +err5: + spinand_cleanup(chip); +err4: + kfree(ecc_engine); +err3: + kfree(controller); +err2: + kfree(chip); +err1: + return ret; +} + +static int generic_spinand_remove(struct spi_device *spi) +{ + struct spinand_device *chip = spi_get_drvdata(spi); + struct mtd_info *mtd = spinand_to_mtd(chip); + + mtd_device_unregister(mtd); + spinand_cleanup(chip); + kfree(chip->ecc.engine); + kfree(chip->controller); + kfree(chip); + + return 0; +} + +static struct spi_driver generic_spinand_driver = { + .driver = { + .name = "generic_spinand", + .owner = THIS_MODULE, + }, + .probe = generic_spinand_probe, + .remove = generic_spinand_remove, +}; +module_spi_driver(generic_spinand_driver); + +MODULE_DESCRIPTION("Generic SPI controller to support SPI NAND"); +MODULE_AUTHOR("Peter Pan"); +MODULE_LICENSE("GPL v2"); -- 1.9.1