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 1cxTvd-0001FF-Li for linux-mtd@lists.infradead.org; Mon, 10 Apr 2017 07:40:04 +0000 From: Peter Pan To: , , , , , , , CC: , , Subject: [PATCH v5 5/6] nand: spi: Add generic SPI controller support Date: Mon, 10 Apr 2017 15:51:52 +0800 Message-ID: <1491810713-27795-6-git-send-email-peterpandong@micron.com> In-Reply-To: <1491810713-27795-1-git-send-email-peterpandong@micron.com> References: <1491810713-27795-1-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 | 159 +++++++++++++++++++++++++ 5 files changed, 168 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 df6c2ea..822e48d 100644 --- a/drivers/mtd/nand/spi/Makefile +++ b/drivers/mtd/nand/spi/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_MTD_SPI_NAND) += core.o obj-$(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..d354874 --- /dev/null +++ b/drivers/mtd/nand/spi/controllers/generic-spi.c @@ -0,0 +1,159 @@ +/* + * 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 + +struct gen_spi_spinand_controller { + struct spinand_controller ctrl; + struct spi_device *spi; +}; + +#define to_gen_spi_spinand_controller(c) \ + container_of(c, struct gen_spi_spinand_controller, ctrl) + +/* + * gen_spi_spinand_exec_op - 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 gen_spi_spinand_exec_op(struct spinand_device *chip, + struct spinand_op *op) +{ + struct spi_message message; + struct spi_transfer x[3]; + struct spinand_controller *scontroller = chip->controller.controller; + struct gen_spi_spinand_controller *controller; + + controller = to_gen_spi_spinand_controller(scontroller); + 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(controller->spi, &message); +} + +static struct spinand_controller_ops gen_spi_spinand_ops = { + .exec_op = gen_spi_spinand_exec_op, +}; + +static int gen_spi_spinand_probe(struct spi_device *spi) +{ + struct spinand_device *chip; + struct gen_spi_spinand_controller *controller; + struct spinand_controller *spinand_controller; + struct device *dev = &spi->dev; + u16 mode = spi->mode; + int ret; + + chip = spinand_alloc(dev); + if (IS_ERR(chip)) { + ret = PTR_ERR(chip); + goto err1; + } + controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL); + if (!controller) { + ret = -ENOMEM; + goto err2; + } + controller->spi = spi; + spinand_controller = &controller->ctrl; + spinand_controller->ops = &gen_spi_spinand_ops; + spinand_controller->caps = SPINAND_CAP_RD_X1 | SPINAND_CAP_WR_X1; + + if ((mode & SPI_RX_QUAD) && (mode & SPI_TX_QUAD)) + spinand_controller->caps |= SPINAND_CAP_RD_QUAD; + if ((mode & SPI_RX_DUAL) && (mode & SPI_TX_DUAL)) + spinand_controller->caps |= SPINAND_CAP_RD_DUAL; + if (mode & SPI_RX_QUAD) + spinand_controller->caps |= SPINAND_CAP_RD_X4; + if (mode & SPI_RX_DUAL) + spinand_controller->caps |= SPINAND_CAP_RD_X2; + if (mode & SPI_TX_QUAD) + spinand_controller->caps |= SPINAND_CAP_WR_QUAD | + SPINAND_CAP_WR_X4; + if (mode & SPI_TX_DUAL) + spinand_controller->caps |= SPINAND_CAP_WR_DUAL | + SPINAND_CAP_WR_X2; + chip->controller.controller = spinand_controller; + /* + * generic spi controller doesn't have ecc capability, + * so use on-die ecc. + */ + chip->ecc.type = SPINAND_ECC_ONDIE; + spi_set_drvdata(spi, chip); + + ret = spinand_register(chip); + if (ret) + goto err3; + + return 0; + +err3: + devm_kfree(dev, controller); +err2: + spinand_free(chip); +err1: + return ret; +} + +static int gen_spi_spinand_remove(struct spi_device *spi) +{ + struct spinand_device *chip = spi_get_drvdata(spi); + struct spinand_controller *scontroller = chip->controller.controller; + struct gen_spi_spinand_controller *controller; + + spinand_unregister(chip); + controller = to_gen_spi_spinand_controller(scontroller); + devm_kfree(&spi->dev, controller); + spinand_free(chip); + + return 0; +} + +static struct spi_driver gen_spi_spinand_driver = { + .driver = { + .name = "generic_spinand", + .owner = THIS_MODULE, + }, + .probe = gen_spi_spinand_probe, + .remove = gen_spi_spinand_remove, +}; +module_spi_driver(gen_spi_spinand_driver); + +MODULE_DESCRIPTION("Generic SPI controller to support SPI NAND"); +MODULE_AUTHOR("Peter Pan"); +MODULE_LICENSE("GPL v2"); -- 1.9.1