|
@@ -0,0 +1,243 @@
|
|
|
+/*
|
|
|
+ * 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
|
|
|
+ *
|
|
|
+ * 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_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 __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",
|
|
|
+ },
|
|
|
+ {},
|
|
|
+};
|
|
|
+
|
|
|
+MODULE_DEVICE_TABLE(of, pasemi_nand_match);
|
|
|
+
|
|
|
+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@pasemi.com>");
|
|
|
+MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");
|