linux/drivers/mtd/nand/raw/pasemi_nand.c
Thomas Gleixner 4505153954 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that 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 you should have received a copy of the gnu general
  public license along with this program if not write to the free
  software foundation inc 59 temple place suite 330 boston ma 02111
  1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 136 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000436.384967451@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:06 +02:00

216 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2006-2007 PA Semi, Inc
*
* Author: Egor Martovetsky <egor@pasemi.com>
* Maintained by: Olof Johansson <olof@lixom.net>
*
* Driver for the PWRficient onchip NAND flash interface
*/
#undef DEBUG
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <asm/io.h>
#define LBICTRL_LPCCTL_NR 0x00004000
#define CLE_PIN_CTL 15
#define ALE_PIN_CTL 14
static unsigned int lpcctl;
static struct mtd_info *pasemi_nand_mtd;
static const char driver_name[] = "pasemi-nand";
static void pasemi_read_buf(struct nand_chip *chip, u_char *buf, int len)
{
while (len > 0x800) {
memcpy_fromio(buf, chip->legacy.IO_ADDR_R, 0x800);
buf += 0x800;
len -= 0x800;
}
memcpy_fromio(buf, chip->legacy.IO_ADDR_R, len);
}
static void pasemi_write_buf(struct nand_chip *chip, const u_char *buf,
int len)
{
while (len > 0x800) {
memcpy_toio(chip->legacy.IO_ADDR_R, buf, 0x800);
buf += 0x800;
len -= 0x800;
}
memcpy_toio(chip->legacy.IO_ADDR_R, buf, len);
}
static void pasemi_hwcontrol(struct nand_chip *chip, int cmd,
unsigned int ctrl)
{
if (cmd == NAND_CMD_NONE)
return;
if (ctrl & NAND_CLE)
out_8(chip->legacy.IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
else
out_8(chip->legacy.IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
/* Push out posted writes */
eieio();
inl(lpcctl);
}
int pasemi_device_ready(struct nand_chip *chip)
{
return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
}
static int pasemi_nand_probe(struct platform_device *ofdev)
{
struct device *dev = &ofdev->dev;
struct pci_dev *pdev;
struct device_node *np = dev->of_node;
struct resource res;
struct nand_chip *chip;
int err = 0;
err = of_address_to_resource(np, 0, &res);
if (err)
return -EINVAL;
/* We only support one device at the moment */
if (pasemi_nand_mtd)
return -ENODEV;
dev_dbg(dev, "pasemi_nand at %pR\n", &res);
/* Allocate memory for MTD device structure and private data */
chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
if (!chip) {
err = -ENOMEM;
goto out;
}
pasemi_nand_mtd = nand_to_mtd(chip);
/* Link the private data with the MTD structure */
pasemi_nand_mtd->dev.parent = dev;
chip->legacy.IO_ADDR_R = of_iomap(np, 0);
chip->legacy.IO_ADDR_W = chip->legacy.IO_ADDR_R;
if (!chip->legacy.IO_ADDR_R) {
err = -EIO;
goto out_mtd;
}
pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
if (!pdev) {
err = -ENODEV;
goto out_ior;
}
lpcctl = pci_resource_start(pdev, 0);
pci_dev_put(pdev);
if (!request_region(lpcctl, 4, driver_name)) {
err = -EBUSY;
goto out_ior;
}
chip->legacy.cmd_ctrl = pasemi_hwcontrol;
chip->legacy.dev_ready = pasemi_device_ready;
chip->legacy.read_buf = pasemi_read_buf;
chip->legacy.write_buf = pasemi_write_buf;
chip->legacy.chip_delay = 0;
chip->ecc.mode = NAND_ECC_SOFT;
chip->ecc.algo = NAND_ECC_HAMMING;
/* Enable the following for a flash based bad block table */
chip->bbt_options = NAND_BBT_USE_FLASH;
/* Scan to find existence of the device */
err = nand_scan(chip, 1);
if (err)
goto out_lpc;
if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
dev_err(dev, "Unable to register MTD device\n");
err = -ENODEV;
goto out_lpc;
}
dev_info(dev, "PA Semi NAND flash at %pR, control at I/O %x\n", &res,
lpcctl);
return 0;
out_lpc:
release_region(lpcctl, 4);
out_ior:
iounmap(chip->legacy.IO_ADDR_R);
out_mtd:
kfree(chip);
out:
return err;
}
static int pasemi_nand_remove(struct platform_device *ofdev)
{
struct nand_chip *chip;
if (!pasemi_nand_mtd)
return 0;
chip = mtd_to_nand(pasemi_nand_mtd);
/* Release resources, unregister device */
nand_release(chip);
release_region(lpcctl, 4);
iounmap(chip->legacy.IO_ADDR_R);
/* Free the MTD device structure */
kfree(chip);
pasemi_nand_mtd = NULL;
return 0;
}
static const struct of_device_id pasemi_nand_match[] =
{
{
.compatible = "pasemi,localbus-nand",
},
{},
};
MODULE_DEVICE_TABLE(of, pasemi_nand_match);
static struct platform_driver pasemi_nand_driver =
{
.driver = {
.name = driver_name,
.of_match_table = pasemi_nand_match,
},
.probe = pasemi_nand_probe,
.remove = pasemi_nand_remove,
};
module_platform_driver(pasemi_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");