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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: Dinh Nguyen <dinguyen@altera.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
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5 changed files with 200 additions and 1 deletions
23
Documentation/devicetree/bindings/mtd/denali-nand.txt
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23
Documentation/devicetree/bindings/mtd/denali-nand.txt
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@ -0,0 +1,23 @@
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* Denali NAND controller
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Required properties:
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- compatible : should be "denali,denali-nand-dt"
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- reg : should contain registers location and length for data and reg.
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- reg-names: Should contain the reg names "nand_data" and "denali_reg"
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- interrupts : The interrupt number.
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- dm-mask : DMA bit mask
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The device tree may optionally contain sub-nodes describing partitions of the
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address space. See partition.txt for more detail.
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Examples:
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nand: nand@ff900000 {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "denali,denali-nand-dt";
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reg = <0xff900000 0x100000>, <0xffb80000 0x10000>;
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reg-names = "nand_data", "denali_reg";
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interrupts = <0 144 4>;
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dma-mask = <0xffffffff>;
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};
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@ -70,6 +70,13 @@ config MTD_NAND_DENALI_PCI
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Enable the driver for NAND flash on Intel Moorestown, using the
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Denali NAND controller core.
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config MTD_NAND_DENALI_DT
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tristate "Support Denali NAND controller as a DT device"
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depends on HAVE_CLK && MTD_NAND_DENALI
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help
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Enable the driver for NAND flash on platforms using a Denali NAND
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controller as a DT device.
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config MTD_NAND_DENALI_SCRATCH_REG_ADDR
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hex "Denali NAND size scratch register address"
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default "0xFF108018"
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@ -14,6 +14,7 @@ obj-$(CONFIG_MTD_NAND_AMS_DELTA) += ams-delta.o
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obj-$(CONFIG_MTD_NAND_AUTCPU12) += autcpu12.o
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obj-$(CONFIG_MTD_NAND_DENALI) += denali.o
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obj-$(CONFIG_MTD_NAND_DENALI_PCI) += denali_pci.o
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obj-$(CONFIG_MTD_NAND_DENALI_DT) += denali_dt.o
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obj-$(CONFIG_MTD_NAND_AU1550) += au1550nd.o
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obj-$(CONFIG_MTD_NAND_BF5XX) += bf5xx_nand.o
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obj-$(CONFIG_MTD_NAND_PPCHAMELEONEVB) += ppchameleonevb.o
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@ -466,6 +466,7 @@ struct nand_buf {
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#define INTEL_CE4100 1
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#define INTEL_MRST 2
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#define DT 3
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struct denali_nand_info {
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struct mtd_info mtd;
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167
drivers/mtd/nand/denali_dt.c
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167
drivers/mtd/nand/denali_dt.c
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/*
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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 <linux/slab.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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static void __iomem *request_and_map(struct device *dev,
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const struct resource *res)
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{
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void __iomem *ptr;
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if (!devm_request_mem_region(dev, res->start, resource_size(res),
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"denali-dt")) {
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dev_err(dev, "unable to request %s\n", res->name);
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return NULL;
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}
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ptr = devm_ioremap_nocache(dev, res->start, resource_size(res));
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if (!res)
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dev_err(dev, "ioremap_nocache of %s failed!", res->name);
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return ptr;
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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 __devinit 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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struct denali_nand_info *denali;
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int ret;
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const struct of_device_id *of_id;
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of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
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if (of_id) {
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ofdev->id_entry = of_id->data;
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} else {
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pr_err("Failed to find the right device id.\n");
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return -ENOMEM;
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}
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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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denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
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nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
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if (!denali_reg || !nand_data) {
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dev_err(&ofdev->dev, "resources not completely defined\n");
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return -EINVAL;
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}
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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 -ENXIO;
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}
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denali->flash_reg = request_and_map(&ofdev->dev, denali_reg);
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if (!denali->flash_reg)
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return -ENOMEM;
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denali->flash_mem = request_and_map(&ofdev->dev, nand_data);
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if (!denali->flash_mem)
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return -ENOMEM;
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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 = 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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clk_put(dt->clk);
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return ret;
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}
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static int __devexit 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(dt->clk);
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clk_put(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 = __devexit_p(denali_dt_remove),
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.driver = {
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.name = "denali-nand-dt",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(denali_nand_dt_ids),
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},
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};
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static int __init denali_init_dt(void)
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{
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return platform_driver_register(&denali_dt_driver);
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}
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module_init(denali_init_dt);
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static void __exit denali_exit_dt(void)
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{
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platform_driver_unregister(&denali_dt_driver);
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}
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module_exit(denali_exit_dt);
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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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