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236 lines
5.4 KiB
236 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright © 2008 Ilya Yanok, Emcraft Systems |
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*/ |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/rawnand.h> |
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#include <linux/mtd/partitions.h> |
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#include <linux/of_address.h> |
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#include <linux/of_platform.h> |
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#include <linux/io.h> |
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#define FPGA_NAND_CMD_MASK (0x7 << 28) |
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#define FPGA_NAND_CMD_COMMAND (0x0 << 28) |
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#define FPGA_NAND_CMD_ADDR (0x1 << 28) |
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#define FPGA_NAND_CMD_READ (0x2 << 28) |
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#define FPGA_NAND_CMD_WRITE (0x3 << 28) |
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#define FPGA_NAND_BUSY (0x1 << 15) |
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#define FPGA_NAND_ENABLE (0x1 << 31) |
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#define FPGA_NAND_DATA_SHIFT 16 |
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struct socrates_nand_host { |
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struct nand_controller controller; |
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struct nand_chip nand_chip; |
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void __iomem *io_base; |
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struct device *dev; |
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}; |
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/** |
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* socrates_nand_write_buf - write buffer to chip |
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* @this: NAND chip object |
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* @buf: data buffer |
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* @len: number of bytes to write |
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*/ |
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static void socrates_nand_write_buf(struct nand_chip *this, const uint8_t *buf, |
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int len) |
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{ |
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int i; |
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struct socrates_nand_host *host = nand_get_controller_data(this); |
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for (i = 0; i < len; i++) { |
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out_be32(host->io_base, FPGA_NAND_ENABLE | |
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FPGA_NAND_CMD_WRITE | |
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(buf[i] << FPGA_NAND_DATA_SHIFT)); |
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} |
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} |
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/** |
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* socrates_nand_read_buf - read chip data into buffer |
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* @this: NAND chip object |
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* @buf: buffer to store date |
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* @len: number of bytes to read |
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*/ |
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static void socrates_nand_read_buf(struct nand_chip *this, uint8_t *buf, |
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int len) |
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{ |
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int i; |
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struct socrates_nand_host *host = nand_get_controller_data(this); |
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uint32_t val; |
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val = FPGA_NAND_ENABLE | FPGA_NAND_CMD_READ; |
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out_be32(host->io_base, val); |
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for (i = 0; i < len; i++) { |
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buf[i] = (in_be32(host->io_base) >> |
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FPGA_NAND_DATA_SHIFT) & 0xff; |
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} |
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} |
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/** |
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* socrates_nand_read_byte - read one byte from the chip |
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* @mtd: MTD device structure |
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*/ |
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static uint8_t socrates_nand_read_byte(struct nand_chip *this) |
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{ |
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uint8_t byte; |
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socrates_nand_read_buf(this, &byte, sizeof(byte)); |
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return byte; |
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} |
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/* |
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* Hardware specific access to control-lines |
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*/ |
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static void socrates_nand_cmd_ctrl(struct nand_chip *nand_chip, int cmd, |
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unsigned int ctrl) |
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{ |
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struct socrates_nand_host *host = nand_get_controller_data(nand_chip); |
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uint32_t val; |
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if (cmd == NAND_CMD_NONE) |
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return; |
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if (ctrl & NAND_CLE) |
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val = FPGA_NAND_CMD_COMMAND; |
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else |
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val = FPGA_NAND_CMD_ADDR; |
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if (ctrl & NAND_NCE) |
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val |= FPGA_NAND_ENABLE; |
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val |= (cmd & 0xff) << FPGA_NAND_DATA_SHIFT; |
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out_be32(host->io_base, val); |
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} |
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/* |
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* Read the Device Ready pin. |
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*/ |
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static int socrates_nand_device_ready(struct nand_chip *nand_chip) |
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{ |
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struct socrates_nand_host *host = nand_get_controller_data(nand_chip); |
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if (in_be32(host->io_base) & FPGA_NAND_BUSY) |
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return 0; /* busy */ |
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return 1; |
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} |
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static int socrates_attach_chip(struct nand_chip *chip) |
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{ |
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chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; |
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if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) |
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chip->ecc.algo = NAND_ECC_ALGO_HAMMING; |
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return 0; |
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} |
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static const struct nand_controller_ops socrates_ops = { |
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.attach_chip = socrates_attach_chip, |
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}; |
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/* |
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* Probe for the NAND device. |
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*/ |
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static int socrates_nand_probe(struct platform_device *ofdev) |
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{ |
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struct socrates_nand_host *host; |
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struct mtd_info *mtd; |
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struct nand_chip *nand_chip; |
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int res; |
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/* Allocate memory for the device structure (and zero it) */ |
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host = devm_kzalloc(&ofdev->dev, sizeof(*host), GFP_KERNEL); |
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if (!host) |
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return -ENOMEM; |
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host->io_base = of_iomap(ofdev->dev.of_node, 0); |
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if (host->io_base == NULL) { |
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dev_err(&ofdev->dev, "ioremap failed\n"); |
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return -EIO; |
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} |
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nand_chip = &host->nand_chip; |
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mtd = nand_to_mtd(nand_chip); |
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host->dev = &ofdev->dev; |
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nand_controller_init(&host->controller); |
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host->controller.ops = &socrates_ops; |
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nand_chip->controller = &host->controller; |
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/* link the private data structures */ |
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nand_set_controller_data(nand_chip, host); |
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nand_set_flash_node(nand_chip, ofdev->dev.of_node); |
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mtd->name = "socrates_nand"; |
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mtd->dev.parent = &ofdev->dev; |
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nand_chip->legacy.cmd_ctrl = socrates_nand_cmd_ctrl; |
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nand_chip->legacy.read_byte = socrates_nand_read_byte; |
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nand_chip->legacy.write_buf = socrates_nand_write_buf; |
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nand_chip->legacy.read_buf = socrates_nand_read_buf; |
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nand_chip->legacy.dev_ready = socrates_nand_device_ready; |
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/* TODO: I have no idea what real delay is. */ |
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nand_chip->legacy.chip_delay = 20; /* 20us command delay time */ |
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dev_set_drvdata(&ofdev->dev, host); |
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res = nand_scan(nand_chip, 1); |
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if (res) |
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goto out; |
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res = mtd_device_register(mtd, NULL, 0); |
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if (!res) |
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return res; |
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nand_cleanup(nand_chip); |
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out: |
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iounmap(host->io_base); |
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return res; |
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} |
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/* |
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* Remove a NAND device. |
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*/ |
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static int socrates_nand_remove(struct platform_device *ofdev) |
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{ |
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struct socrates_nand_host *host = dev_get_drvdata(&ofdev->dev); |
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struct nand_chip *chip = &host->nand_chip; |
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int ret; |
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ret = mtd_device_unregister(nand_to_mtd(chip)); |
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WARN_ON(ret); |
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nand_cleanup(chip); |
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iounmap(host->io_base); |
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return 0; |
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} |
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static const struct of_device_id socrates_nand_match[] = |
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{ |
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{ |
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.compatible = "abb,socrates-nand", |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, socrates_nand_match); |
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static struct platform_driver socrates_nand_driver = { |
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.driver = { |
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.name = "socrates_nand", |
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.of_match_table = socrates_nand_match, |
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}, |
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.probe = socrates_nand_probe, |
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.remove = socrates_nand_remove, |
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}; |
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module_platform_driver(socrates_nand_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Ilya Yanok"); |
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MODULE_DESCRIPTION("NAND driver for Socrates board");
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