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/*
* drivers/mtd/nand/orion_nand.c
*
* NAND support for Marvell Orion SoC platforms
*
* Tzachi Perelstein <tzachi@marvell.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <mach/hardware.h>
#include <plat/orion_nand.h>
static void orion_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *nc = mtd->priv;
struct orion_nand_data *board = nc->priv;
u32 offs;
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
offs = (1 << board->cle);
else if (ctrl & NAND_ALE)
offs = (1 << board->ale);
else
return;
if (nc->options & NAND_BUSWIDTH_16)
offs <<= 1;
writeb(cmd, nc->IO_ADDR_W + offs);
}
static void orion_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct nand_chip *chip = mtd->priv;
void __iomem *io_base = chip->IO_ADDR_R;
uint64_t *buf64;
int i = 0;
while (len && (unsigned long)buf & 7) {
*buf++ = readb(io_base);
len--;
}
buf64 = (uint64_t *)buf;
while (i < len/8) {
/*
* Since GCC has no proper constraint (PR 43518)
* force x variable to r2/r3 registers as ldrd instruction
* requires first register to be even.
*/
register uint64_t x asm ("r2");
asm volatile ("ldrd\t%0, [%1]" : "=&r" (x) : "r" (io_base));
buf64[i++] = x;
}
i *= 8;
while (i < len)
buf[i++] = readb(io_base);
}
static int __init orion_nand_probe(struct platform_device *pdev)
{
struct mtd_info *mtd;
struct nand_chip *nc;
struct orion_nand_data *board;
struct resource *res;
struct clk *clk;
void __iomem *io_base;
int ret = 0;
nc = kzalloc(sizeof(struct nand_chip) + sizeof(struct mtd_info), GFP_KERNEL);
if (!nc) {
printk(KERN_ERR "orion_nand: failed to allocate device structure.\n");
ret = -ENOMEM;
goto no_res;
}
mtd = (struct mtd_info *)(nc + 1);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENODEV;
goto no_res;
}
io_base = ioremap(res->start, resource_size(res));
if (!io_base) {
printk(KERN_ERR "orion_nand: ioremap failed\n");
ret = -EIO;
goto no_res;
}
board = pdev->dev.platform_data;
mtd->priv = nc;
mtd->owner = THIS_MODULE;
nc->priv = board;
nc->IO_ADDR_R = nc->IO_ADDR_W = io_base;
nc->cmd_ctrl = orion_nand_cmd_ctrl;
nc->read_buf = orion_nand_read_buf;
nc->ecc.mode = NAND_ECC_SOFT;
if (board->chip_delay)
nc->chip_delay = board->chip_delay;
if (board->width == 16)
nc->options |= NAND_BUSWIDTH_16;
if (board->dev_ready)
nc->dev_ready = board->dev_ready;
platform_set_drvdata(pdev, mtd);
/* Not all platforms can gate the clock, so it is not
an error if the clock does not exists. */
clk = clk_get(&pdev->dev, NULL);
if (!IS_ERR(clk)) {
clk_prepare_enable(clk);
clk_put(clk);
}
if (nand_scan(mtd, 1)) {
ret = -ENXIO;
goto no_dev;
}
mtd->name = "orion_nand";
ret = mtd_device_parse_register(mtd, NULL, NULL, board->parts,
board->nr_parts);
if (ret) {
nand_release(mtd);
goto no_dev;
}
return 0;
no_dev:
platform_set_drvdata(pdev, NULL);
iounmap(io_base);
no_res:
kfree(nc);
return ret;
}
static int __devexit orion_nand_remove(struct platform_device *pdev)
{
struct mtd_info *mtd = platform_get_drvdata(pdev);
struct nand_chip *nc = mtd->priv;
struct clk *clk;
nand_release(mtd);
iounmap(nc->IO_ADDR_W);
kfree(nc);
clk = clk_get(&pdev->dev, NULL);
if (!IS_ERR(clk)) {
clk_disable_unprepare(clk);
clk_put(clk);
}
return 0;
}
static struct platform_driver orion_nand_driver = {
.remove = __devexit_p(orion_nand_remove),
.driver = {
.name = "orion_nand",
.owner = THIS_MODULE,
},
};
static int __init orion_nand_init(void)
{
return platform_driver_probe(&orion_nand_driver, orion_nand_probe);
}
static void __exit orion_nand_exit(void)
{
platform_driver_unregister(&orion_nand_driver);
}
module_init(orion_nand_init);
module_exit(orion_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tzachi Perelstein");
MODULE_DESCRIPTION("NAND glue for Orion platforms");
MODULE_ALIAS("platform:orion_nand");
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