cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

plat_nand.c (4030B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Generic NAND driver
      4 *
      5 * Author: Vitaly Wool <vitalywool@gmail.com>
      6 */
      7
      8#include <linux/err.h>
      9#include <linux/io.h>
     10#include <linux/module.h>
     11#include <linux/platform_device.h>
     12#include <linux/slab.h>
     13#include <linux/mtd/mtd.h>
     14#include <linux/mtd/platnand.h>
     15
     16struct plat_nand_data {
     17	struct nand_controller	controller;
     18	struct nand_chip	chip;
     19	void __iomem		*io_base;
     20};
     21
     22static int plat_nand_attach_chip(struct nand_chip *chip)
     23{
     24	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&
     25	    chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
     26		chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
     27
     28	return 0;
     29}
     30
     31static const struct nand_controller_ops plat_nand_ops = {
     32	.attach_chip = plat_nand_attach_chip,
     33};
     34
     35/*
     36 * Probe for the NAND device.
     37 */
     38static int plat_nand_probe(struct platform_device *pdev)
     39{
     40	struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
     41	struct plat_nand_data *data;
     42	struct mtd_info *mtd;
     43	const char **part_types;
     44	int err = 0;
     45
     46	if (!pdata) {
     47		dev_err(&pdev->dev, "platform_nand_data is missing\n");
     48		return -EINVAL;
     49	}
     50
     51	if (pdata->chip.nr_chips < 1) {
     52		dev_err(&pdev->dev, "invalid number of chips specified\n");
     53		return -EINVAL;
     54	}
     55
     56	/* Allocate memory for the device structure (and zero it) */
     57	data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
     58			    GFP_KERNEL);
     59	if (!data)
     60		return -ENOMEM;
     61
     62	data->controller.ops = &plat_nand_ops;
     63	nand_controller_init(&data->controller);
     64	data->chip.controller = &data->controller;
     65
     66	data->io_base = devm_platform_ioremap_resource(pdev, 0);
     67	if (IS_ERR(data->io_base))
     68		return PTR_ERR(data->io_base);
     69
     70	nand_set_flash_node(&data->chip, pdev->dev.of_node);
     71	mtd = nand_to_mtd(&data->chip);
     72	mtd->dev.parent = &pdev->dev;
     73
     74	data->chip.legacy.IO_ADDR_R = data->io_base;
     75	data->chip.legacy.IO_ADDR_W = data->io_base;
     76	data->chip.legacy.cmd_ctrl = pdata->ctrl.cmd_ctrl;
     77	data->chip.legacy.dev_ready = pdata->ctrl.dev_ready;
     78	data->chip.legacy.select_chip = pdata->ctrl.select_chip;
     79	data->chip.legacy.write_buf = pdata->ctrl.write_buf;
     80	data->chip.legacy.read_buf = pdata->ctrl.read_buf;
     81	data->chip.legacy.chip_delay = pdata->chip.chip_delay;
     82	data->chip.options |= pdata->chip.options;
     83	data->chip.bbt_options |= pdata->chip.bbt_options;
     84
     85	platform_set_drvdata(pdev, data);
     86
     87	/* Handle any platform specific setup */
     88	if (pdata->ctrl.probe) {
     89		err = pdata->ctrl.probe(pdev);
     90		if (err)
     91			goto out;
     92	}
     93
     94	/*
     95	 * This driver assumes that the default ECC engine should be TYPE_SOFT.
     96	 * Set ->engine_type before registering the NAND devices in order to
     97	 * provide a driver specific default value.
     98	 */
     99	data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
    100
    101	/* Scan to find existence of the device */
    102	err = nand_scan(&data->chip, pdata->chip.nr_chips);
    103	if (err)
    104		goto out;
    105
    106	part_types = pdata->chip.part_probe_types;
    107
    108	err = mtd_device_parse_register(mtd, part_types, NULL,
    109					pdata->chip.partitions,
    110					pdata->chip.nr_partitions);
    111
    112	if (!err)
    113		return err;
    114
    115	nand_cleanup(&data->chip);
    116out:
    117	if (pdata->ctrl.remove)
    118		pdata->ctrl.remove(pdev);
    119	return err;
    120}
    121
    122/*
    123 * Remove a NAND device.
    124 */
    125static int plat_nand_remove(struct platform_device *pdev)
    126{
    127	struct plat_nand_data *data = platform_get_drvdata(pdev);
    128	struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
    129	struct nand_chip *chip = &data->chip;
    130	int ret;
    131
    132	ret = mtd_device_unregister(nand_to_mtd(chip));
    133	WARN_ON(ret);
    134	nand_cleanup(chip);
    135	if (pdata->ctrl.remove)
    136		pdata->ctrl.remove(pdev);
    137
    138	return 0;
    139}
    140
    141static const struct of_device_id plat_nand_match[] = {
    142	{ .compatible = "gen_nand" },
    143	{},
    144};
    145MODULE_DEVICE_TABLE(of, plat_nand_match);
    146
    147static struct platform_driver plat_nand_driver = {
    148	.probe	= plat_nand_probe,
    149	.remove	= plat_nand_remove,
    150	.driver	= {
    151		.name		= "gen_nand",
    152		.of_match_table = plat_nand_match,
    153	},
    154};
    155
    156module_platform_driver(plat_nand_driver);
    157
    158MODULE_LICENSE("GPL");
    159MODULE_AUTHOR("Vitaly Wool");
    160MODULE_DESCRIPTION("Simple generic NAND driver");
    161MODULE_ALIAS("platform:gen_nand");