[PATCH] mtd: nand: remove pasemi_nand driver
Olof Johansson
olof at lixom.net
Fri Dec 27 00:52:04 EST 2013
The PA Semi platform is sparsely used these days (with just a handful
of known users out there). I'm 100% sure none of them use the MTD NAND
driver -- most standard use cases include PCI-e SATA controllers for
storage instead, and boot is done from LPC NOR flash.
So, there's little reason to keep carrying a driver that's not used by
anybody and that just gets hit by some tree-wide or tools-based changes
every now and then.
Signed-off-by: Olof Johansson <olof at lixom.net>
---
drivers/mtd/nand/pasemi_nand.c | 238 ----------------------------------------
1 file changed, 238 deletions(-)
delete mode 100644 drivers/mtd/nand/pasemi_nand.c
diff --git a/drivers/mtd/nand/pasemi_nand.c b/drivers/mtd/nand/pasemi_nand.c
deleted file mode 100644
index 90f871a..0000000
--- a/drivers/mtd/nand/pasemi_nand.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * Copyright (C) 2006-2007 PA Semi, Inc
- *
- * Author: Egor Martovetsky <egor at pasemi.com>
- * Maintained by: Olof Johansson <olof at lixom.net>
- *
- * Driver for the PWRficient onchip NAND flash interface
- *
- * 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
- */
-
-#undef DEBUG
-
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/nand.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 mtd_info *mtd, u_char *buf, int len)
-{
- struct nand_chip *chip = mtd->priv;
-
- while (len > 0x800) {
- memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
- buf += 0x800;
- len -= 0x800;
- }
- memcpy_fromio(buf, chip->IO_ADDR_R, len);
-}
-
-static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
-{
- struct nand_chip *chip = mtd->priv;
-
- while (len > 0x800) {
- memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
- buf += 0x800;
- len -= 0x800;
- }
- memcpy_toio(chip->IO_ADDR_R, buf, len);
-}
-
-static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
- unsigned int ctrl)
-{
- struct nand_chip *chip = mtd->priv;
-
- if (cmd == NAND_CMD_NONE)
- return;
-
- if (ctrl & NAND_CLE)
- out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
- else
- out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
-
- /* Push out posted writes */
- eieio();
- inl(lpcctl);
-}
-
-int pasemi_device_ready(struct mtd_info *mtd)
-{
- return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
-}
-
-static int pasemi_nand_probe(struct platform_device *ofdev)
-{
- struct pci_dev *pdev;
- struct device_node *np = ofdev->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;
-
- pr_debug("pasemi_nand at %pR\n", &res);
-
- /* Allocate memory for MTD device structure and private data */
- pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
- sizeof(struct nand_chip), GFP_KERNEL);
- if (!pasemi_nand_mtd) {
- printk(KERN_WARNING
- "Unable to allocate PASEMI NAND MTD device structure\n");
- err = -ENOMEM;
- goto out;
- }
-
- /* Get pointer to private data */
- chip = (struct nand_chip *)&pasemi_nand_mtd[1];
-
- /* Link the private data with the MTD structure */
- pasemi_nand_mtd->priv = chip;
- pasemi_nand_mtd->owner = THIS_MODULE;
-
- chip->IO_ADDR_R = of_iomap(np, 0);
- chip->IO_ADDR_W = chip->IO_ADDR_R;
-
- if (!chip->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->cmd_ctrl = pasemi_hwcontrol;
- chip->dev_ready = pasemi_device_ready;
- chip->read_buf = pasemi_read_buf;
- chip->write_buf = pasemi_write_buf;
- chip->chip_delay = 0;
- chip->ecc.mode = NAND_ECC_SOFT;
-
- /* Enable the following for a flash based bad block table */
- chip->bbt_options = NAND_BBT_USE_FLASH;
-
- /* Scan to find existence of the device */
- if (nand_scan(pasemi_nand_mtd, 1)) {
- err = -ENXIO;
- goto out_lpc;
- }
-
- if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
- printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
- err = -ENODEV;
- goto out_lpc;
- }
-
- printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
- res.start, lpcctl);
-
- return 0;
-
- out_lpc:
- release_region(lpcctl, 4);
- out_ior:
- iounmap(chip->IO_ADDR_R);
- out_mtd:
- kfree(pasemi_nand_mtd);
- out:
- return err;
-}
-
-static int pasemi_nand_remove(struct platform_device *ofdev)
-{
- struct nand_chip *chip;
-
- if (!pasemi_nand_mtd)
- return 0;
-
- chip = pasemi_nand_mtd->priv;
-
- /* Release resources, unregister device */
- nand_release(pasemi_nand_mtd);
-
- release_region(lpcctl, 4);
-
- iounmap(chip->IO_ADDR_R);
-
- /* Free the MTD device structure */
- kfree(pasemi_nand_mtd);
-
- 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,
- .owner = THIS_MODULE,
- .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 at pasemi.com>");
-MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
--
1.7.10.4
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