[PATCH] MTD: pasemi_nand driver
Olof Johansson
olof at lixom.net
Wed Nov 28 17:14:48 EST 2007
Plumbing for NAND connected via localbus on PA Semi PWRficient-based
boards.
From: Egor Martovetsky <egor at pasemi.com>
Signed-off-by: Olof Johansson <olof at lixom.net>
Index: 2.6.24/drivers/mtd/nand/Kconfig
===================================================================
--- 2.6.24.orig/drivers/mtd/nand/Kconfig
+++ 2.6.24/drivers/mtd/nand/Kconfig
@@ -283,6 +283,12 @@ config MTD_NAND_CM_X270
tristate "Support for NAND Flash on CM-X270 modules"
depends on MTD_NAND && MACH_ARMCORE
+config MTD_NAND_PASEMI
+ tristate "NAND support for PA Semi PWRficient"
+ depends on MTD_NAND && PPC_PASEMI
+ help
+ Enables support for NAND Flash interface on PA Semi PWRficient
+ based boards
config MTD_NAND_NANDSIM
tristate "Support for NAND Flash Simulator"
Index: 2.6.24/drivers/mtd/nand/Makefile
===================================================================
--- 2.6.24.orig/drivers/mtd/nand/Makefile
+++ 2.6.24/drivers/mtd/nand/Makefile
@@ -29,5 +29,6 @@ obj-$(CONFIG_MTD_NAND_CM_X270) += cmx27
obj-$(CONFIG_MTD_NAND_BASLER_EXCITE) += excite_nandflash.o
obj-$(CONFIG_MTD_NAND_PLATFORM) += plat_nand.o
obj-$(CONFIG_MTD_ALAUDA) += alauda.o
+obj-$(CONFIG_MTD_NAND_PASEMI) += pasemi_nand.o
nand-objs := nand_base.o nand_bbt.o
Index: 2.6.24/drivers/mtd/nand/pasemi_nand.c
===================================================================
--- /dev/null
+++ 2.6.24/drivers/mtd/nand/pasemi_nand.c
@@ -0,0 +1,241 @@
+/*
+ * 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/platform_device.h>
+#include <linux/pci.h>
+#include <asm/of_platform.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 __devinit pasemi_nand_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ struct pci_dev *pdev;
+ struct device_node *np = ofdev->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 %lx-%lx\n", res.start, res.end);
+
+ /* 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);
+
+ 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->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
+
+ /* Scan to find existance of the device */
+ if (nand_scan(pasemi_nand_mtd, 1)) {
+ err = -ENXIO;
+ goto out_lpc;
+ }
+
+ if (add_mtd_device(pasemi_nand_mtd)) {
+ printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
+ err = -ENODEV;
+ goto out_lpc;
+ }
+
+ printk(KERN_INFO "PA Semi NAND flash at %08lx, 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 __devexit pasemi_nand_remove(struct of_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 struct of_device_id pasemi_nand_match[] =
+{
+ {
+ .compatible = "pasemi,localbus-nand",
+ },
+ {},
+};
+
+static struct of_platform_driver pasemi_nand_driver =
+{
+ .name = (char*)driver_name,
+ .match_table = pasemi_nand_match,
+ .probe = pasemi_nand_probe,
+ .remove = pasemi_nand_remove,
+};
+
+static int __init pasemi_nand_init(void)
+{
+ return of_register_platform_driver(&pasemi_nand_driver);
+}
+module_init(pasemi_nand_init);
+
+static void __exit pasemi_nand_exit(void)
+{
+ of_unregister_platform_driver(&pasemi_nand_driver);
+}
+module_exit(pasemi_nand_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Egor Martovetsky <egor at pasemi.com>");
+MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
More information about the linux-mtd
mailing list