be72a4aa8e
The Denali NAND controller IP has various customizable features. SoC vendors can choose desired functions when a delivery RTL is created. It means there are several variants for this IP. For example, the Intel version is equipped with 32bit DMA, whereas the IP for UniPhier SoC family with 64bit DMA. This driver was originally written for some Intel platforms with Intel specific things hard-coded. What is worse, the revision register of this IP does not work to distinguish such features. We need to do something to make the driver available for other SoCs. Let's introduce a caps member to the denali_nand_info structure to switch on/off various features. Also, add struct denali_dt_data to store the capability associated with compatible string. Boris suggested this approach in discussion [1] instead of a new DT property for every feature. [1] https://lkml.org/lkml/2016/3/29/142 Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
131 lines
3.2 KiB
C
131 lines
3.2 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 caps;
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};
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static const struct of_device_id denali_nand_dt_ids[] = {
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{ .compatible = "denali,denali-nand-dt" },
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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 u64 denali_dma_mask;
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static int denali_dt_probe(struct platform_device *ofdev)
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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(&ofdev->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(&ofdev->dev);
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if (data)
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denali->caps = data->caps;
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denali->platform = DT;
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denali->dev = &ofdev->dev;
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denali->irq = platform_get_irq(ofdev, 0);
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if (denali->irq < 0) {
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dev_err(&ofdev->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(ofdev, IORESOURCE_MEM, "denali_reg");
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denali->flash_reg = devm_ioremap_resource(&ofdev->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(ofdev, IORESOURCE_MEM, "nand_data");
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denali->flash_mem = devm_ioremap_resource(&ofdev->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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if (!of_property_read_u32(ofdev->dev.of_node,
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"dma-mask", (u32 *)&denali_dma_mask)) {
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denali->dev->dma_mask = &denali_dma_mask;
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} else {
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denali->dev->dma_mask = NULL;
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}
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dt->clk = devm_clk_get(&ofdev->dev, NULL);
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if (IS_ERR(dt->clk)) {
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dev_err(&ofdev->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(ofdev, 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 *ofdev)
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{
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struct denali_dt *dt = platform_get_drvdata(ofdev);
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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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