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e7beeeec85
Commit 271707b1d8 ("mtd: nand: denali: max_banks calculation
changed in revision 5.1") added a revision check to support the
new max_banks encoding. Its git-log states "The encoding of
max_banks changed in Denali revision 5.1".
There are exceptional cases, for example, the revision register on
some UniPhier SoCs says the IP is 5.0 but the max_banks is encoded
in the new format.
This IP updates the resister specification from time to time (often
breaking the backward compatibility), but the revision number is not
incremented correctly.
The max_banks is not only the case that needs revision checking.
Let's allow to override an incorrect revision number.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/*
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* NAND Flash Controller Device Driver for DT
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*
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* Copyright © 2011, Picochip.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include "denali.h"
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struct denali_dt {
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struct denali_nand_info denali;
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struct clk *clk;
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};
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struct denali_dt_data {
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unsigned int revision;
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unsigned int caps;
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};
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static const struct denali_dt_data denali_socfpga_data = {
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.caps = DENALI_CAP_HW_ECC_FIXUP,
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};
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static const struct of_device_id denali_nand_dt_ids[] = {
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{
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.compatible = "altr,socfpga-denali-nand",
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.data = &denali_socfpga_data,
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
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static int denali_dt_probe(struct platform_device *pdev)
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{
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struct resource *denali_reg, *nand_data;
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struct denali_dt *dt;
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const struct denali_dt_data *data;
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struct denali_nand_info *denali;
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int ret;
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dt = devm_kzalloc(&pdev->dev, sizeof(*dt), GFP_KERNEL);
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if (!dt)
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return -ENOMEM;
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denali = &dt->denali;
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data = of_device_get_match_data(&pdev->dev);
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if (data) {
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denali->revision = data->revision;
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denali->caps = data->caps;
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}
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denali->platform = DT;
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denali->dev = &pdev->dev;
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denali->irq = platform_get_irq(pdev, 0);
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if (denali->irq < 0) {
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dev_err(&pdev->dev, "no irq defined\n");
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return denali->irq;
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}
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denali_reg = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"denali_reg");
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denali->flash_reg = devm_ioremap_resource(&pdev->dev, denali_reg);
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if (IS_ERR(denali->flash_reg))
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return PTR_ERR(denali->flash_reg);
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nand_data = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"nand_data");
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denali->flash_mem = devm_ioremap_resource(&pdev->dev, nand_data);
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if (IS_ERR(denali->flash_mem))
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return PTR_ERR(denali->flash_mem);
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dt->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(dt->clk)) {
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dev_err(&pdev->dev, "no clk available\n");
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return PTR_ERR(dt->clk);
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}
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clk_prepare_enable(dt->clk);
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ret = denali_init(denali);
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if (ret)
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goto out_disable_clk;
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platform_set_drvdata(pdev, dt);
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return 0;
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out_disable_clk:
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clk_disable_unprepare(dt->clk);
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return ret;
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}
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static int denali_dt_remove(struct platform_device *pdev)
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{
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struct denali_dt *dt = platform_get_drvdata(pdev);
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denali_remove(&dt->denali);
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clk_disable_unprepare(dt->clk);
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return 0;
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}
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static struct platform_driver denali_dt_driver = {
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.probe = denali_dt_probe,
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.remove = denali_dt_remove,
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.driver = {
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.name = "denali-nand-dt",
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.of_match_table = denali_nand_dt_ids,
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},
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};
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module_platform_driver(denali_dt_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jamie Iles");
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MODULE_DESCRIPTION("DT driver for Denali NAND controller");
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