[MTD] [NAND] pasemi_nand driver
authorEgor Martovetsky <egor@pasemi.com>
Thu, 29 Nov 2007 00:37:31 +0000 (18:37 -0600)
committerDavid Woodhouse <dwmw2@infradead.org>
Thu, 29 Nov 2007 00:47:13 +0000 (00:47 +0000)
Plumbing for NAND connected via localbus on PA Semi PWRficient-based
boards.

From: Egor Martovetsky <egor@pasemi.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
drivers/mtd/nand/Kconfig
drivers/mtd/nand/Makefile
drivers/mtd/nand/pasemi_nand.c [new file with mode: 0644]

index bf0e9b0..f8db625 100644 (file)
@@ -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 3ad6c01..fd50047 100644 (file)
@@ -29,5 +29,6 @@ obj-$(CONFIG_MTD_NAND_CM_X270)                += cmx270_nand.o
 obj-$(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
diff --git a/drivers/mtd/nand/pasemi_nand.c b/drivers/mtd/nand/pasemi_nand.c
new file mode 100644 (file)
index 0000000..75c8990
--- /dev/null
@@ -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");