168 lines
4.0 KiB
C
168 lines
4.0 KiB
C
/*
|
|
* 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");
|