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Commit 30f9f2fb authored by Dinh Nguyen's avatar Dinh Nguyen Committed by Artem Bityutskiy
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mtd: denali: add a DT driver 



Add a device tree version of the Denali NAND driver. Based
on an original patch from Jamie Iles to add a MMIO version
of this driver.

Signed-off-by: default avatarDinh Nguyen <dinguyen@altera.com>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
parent 2a0a288e

Documentation/devicetree/bindings/mtd/denali-nand.txt

0 → 100644
+23 −0
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* Denali NAND controller



Required properties:

  - compatible : should be "denali,denali-nand-dt"

  - reg : should contain registers location and length for data and reg.

  - reg-names: Should contain the reg names "nand_data" and "denali_reg"

  - interrupts : The interrupt number.

  - dm-mask : DMA bit mask



The device tree may optionally contain sub-nodes describing partitions of the

address space. See partition.txt for more detail.



Examples:



nand: nand@ff900000 {

	#address-cells = <1>;

	#size-cells = <1>;

	compatible = "denali,denali-nand-dt";

	reg = <0xff900000 0x100000>, <0xffb80000 0x10000>;

	reg-names = "nand_data", "denali_reg";

	interrupts = <0 144 4>;

	dma-mask = <0xffffffff>;

};

drivers/mtd/nand/Kconfig

+8 −1
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@@ -70,6 +70,13 @@ config MTD_NAND_DENALI_PCI 
          Enable the driver for NAND flash on Intel Moorestown, using the

          Denali NAND controller core.



config MTD_NAND_DENALI_DT

	tristate "Support Denali NAND controller as a DT device"

	depends on HAVE_CLK && MTD_NAND_DENALI

	help

	  Enable the driver for NAND flash on platforms using a Denali NAND

	  controller as a DT device.



config MTD_NAND_DENALI_SCRATCH_REG_ADDR

        hex "Denali NAND size scratch register address"

        default "0xFF108018"

drivers/mtd/nand/Makefile

+1 −0
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@@ -14,6 +14,7 @@ obj-$(CONFIG_MTD_NAND_AMS_DELTA) += ams-delta.o 
obj-$(CONFIG_MTD_NAND_AUTCPU12)		+= autcpu12.o

obj-$(CONFIG_MTD_NAND_DENALI)		+= denali.o

obj-$(CONFIG_MTD_NAND_DENALI_PCI)	+= denali_pci.o

obj-$(CONFIG_MTD_NAND_DENALI_DT)	+= denali_dt.o

obj-$(CONFIG_MTD_NAND_AU1550)		+= au1550nd.o

obj-$(CONFIG_MTD_NAND_BF5XX)		+= bf5xx_nand.o

obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB)	+= ppchameleonevb.o

drivers/mtd/nand/denali.h

+1 −0
Original line number Diff line number Diff line
@@ -466,6 +466,7 @@ struct nand_buf { 


#define INTEL_CE4100	1

#define INTEL_MRST	2

#define DT		3



struct denali_nand_info {

	struct mtd_info mtd;

drivers/mtd/nand/denali_dt.c

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/*

 * NAND Flash Controller Device Driver for DT

 *

 * Copyright © 2011, Picochip.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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 <linux/clk.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/slab.h>



#include "denali.h"



struct denali_dt {

	struct denali_nand_info	denali;

	struct clk		*clk;

};



static void __iomem *request_and_map(struct device *dev,

				     const struct resource *res)

{

	void __iomem *ptr;



	if (!devm_request_mem_region(dev, res->start, resource_size(res),

				     "denali-dt")) {

		dev_err(dev, "unable to request %s\n", res->name);

		return NULL;

	}



	ptr = devm_ioremap_nocache(dev, res->start, resource_size(res));

	if (!res)

		dev_err(dev, "ioremap_nocache of %s failed!", res->name);



	return ptr;

}



static const struct of_device_id denali_nand_dt_ids[] = {

		{ .compatible = "denali,denali-nand-dt" },

		{ /* sentinel */ }

	};



MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);



static u64 denali_dma_mask;



static int __devinit denali_dt_probe(struct platform_device *ofdev)

{

	struct resource *denali_reg, *nand_data;

	struct denali_dt *dt;

	struct denali_nand_info *denali;

	int ret;

	const struct of_device_id *of_id;



	of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);

	if (of_id) {

		ofdev->id_entry = of_id->data;

	} else {

		pr_err("Failed to find the right device id.\n");

		return -ENOMEM;

	}



	dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);

	if (!dt)

		return -ENOMEM;

	denali = &dt->denali;



	denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");

	nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");

	if (!denali_reg || !nand_data) {

		dev_err(&ofdev->dev, "resources not completely defined\n");

		return -EINVAL;

	}



	denali->platform = DT;

	denali->dev = &ofdev->dev;

	denali->irq = platform_get_irq(ofdev, 0);

	if (denali->irq < 0) {

		dev_err(&ofdev->dev, "no irq defined\n");

		return -ENXIO;

	}



	denali->flash_reg = request_and_map(&ofdev->dev, denali_reg);

	if (!denali->flash_reg)

		return -ENOMEM;



	denali->flash_mem = request_and_map(&ofdev->dev, nand_data);

	if (!denali->flash_mem)

		return -ENOMEM;



	if (!of_property_read_u32(ofdev->dev.of_node,

		"dma-mask", (u32 *)&denali_dma_mask)) {

		denali->dev->dma_mask = &denali_dma_mask;

	} else {

		denali->dev->dma_mask = NULL;

	}



	dt->clk = clk_get(&ofdev->dev, NULL);

	if (IS_ERR(dt->clk)) {

		dev_err(&ofdev->dev, "no clk available\n");

		return PTR_ERR(dt->clk);

	}

	clk_prepare_enable(dt->clk);



	ret = denali_init(denali);

	if (ret)

		goto out_disable_clk;



	platform_set_drvdata(ofdev, dt);

	return 0;



out_disable_clk:

	clk_disable_unprepare(dt->clk);

	clk_put(dt->clk);



	return ret;

}



static int __devexit denali_dt_remove(struct platform_device *ofdev)

{

	struct denali_dt *dt = platform_get_drvdata(ofdev);



	denali_remove(&dt->denali);

	clk_disable(dt->clk);

	clk_put(dt->clk);



	return 0;

}



static struct platform_driver denali_dt_driver = {

	.probe		= denali_dt_probe,

	.remove		= __devexit_p(denali_dt_remove),

	.driver		= {

		.name	= "denali-nand-dt",

		.owner	= THIS_MODULE,

		.of_match_table	= of_match_ptr(denali_nand_dt_ids),

	},

};



static int __init denali_init_dt(void)

{

	return platform_driver_register(&denali_dt_driver);

}

module_init(denali_init_dt);



static void __exit denali_exit_dt(void)

{

	platform_driver_unregister(&denali_dt_driver);

}

module_exit(denali_exit_dt);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Jamie Iles");

MODULE_DESCRIPTION("DT driver for Denali NAND controller");