2 * Copyright (C) 2006-2007 PA Semi, Inc
4 * Author: Egor Martovetsky <egor@pasemi.com>
5 * Maintained by: Olof Johansson <olof@lixom.net>
7 * Driver for the PWRficient onchip NAND flash interface
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/mtd/nand.h>
30 #include <linux/mtd/nand_ecc.h>
31 #include <linux/of_platform.h>
32 #include <linux/platform_device.h>
33 #include <linux/pci.h>
37 #define LBICTRL_LPCCTL_NR 0x00004000
38 #define CLE_PIN_CTL 15
39 #define ALE_PIN_CTL 14
41 static unsigned int lpcctl;
42 static struct mtd_info *pasemi_nand_mtd;
43 static const char driver_name[] = "pasemi-nand";
45 static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
47 struct nand_chip *chip = mtd->priv;
50 memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
54 memcpy_fromio(buf, chip->IO_ADDR_R, len);
57 static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
59 struct nand_chip *chip = mtd->priv;
62 memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
66 memcpy_toio(chip->IO_ADDR_R, buf, len);
69 static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
72 struct nand_chip *chip = mtd->priv;
74 if (cmd == NAND_CMD_NONE)
78 out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
80 out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
82 /* Push out posted writes */
87 int pasemi_device_ready(struct mtd_info *mtd)
89 return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
92 static int __devinit pasemi_nand_probe(struct of_device *ofdev,
93 const struct of_device_id *match)
96 struct device_node *np = ofdev->node;
98 struct nand_chip *chip;
101 err = of_address_to_resource(np, 0, &res);
106 /* We only support one device at the moment */
110 pr_debug("pasemi_nand at %lx-%lx\n", res.start, res.end);
112 /* Allocate memory for MTD device structure and private data */
113 pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
114 sizeof(struct nand_chip), GFP_KERNEL);
115 if (!pasemi_nand_mtd) {
117 "Unable to allocate PASEMI NAND MTD device structure\n");
122 /* Get pointer to private data */
123 chip = (struct nand_chip *)&pasemi_nand_mtd[1];
125 /* Link the private data with the MTD structure */
126 pasemi_nand_mtd->priv = chip;
127 pasemi_nand_mtd->owner = THIS_MODULE;
129 chip->IO_ADDR_R = of_iomap(np, 0);
130 chip->IO_ADDR_W = chip->IO_ADDR_R;
132 if (!chip->IO_ADDR_R) {
137 pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
143 lpcctl = pci_resource_start(pdev, 0);
146 if (!request_region(lpcctl, 4, driver_name)) {
151 chip->cmd_ctrl = pasemi_hwcontrol;
152 chip->dev_ready = pasemi_device_ready;
153 chip->read_buf = pasemi_read_buf;
154 chip->write_buf = pasemi_write_buf;
155 chip->chip_delay = 0;
156 chip->ecc.mode = NAND_ECC_SOFT;
158 /* Enable the following for a flash based bad block table */
159 chip->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
161 /* Scan to find existance of the device */
162 if (nand_scan(pasemi_nand_mtd, 1)) {
167 if (add_mtd_device(pasemi_nand_mtd)) {
168 printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
173 printk(KERN_INFO "PA Semi NAND flash at %08lx, control at I/O %x\n",
179 release_region(lpcctl, 4);
181 iounmap(chip->IO_ADDR_R);
183 kfree(pasemi_nand_mtd);
188 static int __devexit pasemi_nand_remove(struct of_device *ofdev)
190 struct nand_chip *chip;
192 if (!pasemi_nand_mtd)
195 chip = pasemi_nand_mtd->priv;
197 /* Release resources, unregister device */
198 nand_release(pasemi_nand_mtd);
200 release_region(lpcctl, 4);
202 iounmap(chip->IO_ADDR_R);
204 /* Free the MTD device structure */
205 kfree(pasemi_nand_mtd);
207 pasemi_nand_mtd = NULL;
212 static struct of_device_id pasemi_nand_match[] =
215 .compatible = "pasemi,localbus-nand",
220 MODULE_DEVICE_TABLE(of, pasemi_nand_match);
222 static struct of_platform_driver pasemi_nand_driver =
224 .name = (char*)driver_name,
225 .match_table = pasemi_nand_match,
226 .probe = pasemi_nand_probe,
227 .remove = pasemi_nand_remove,
230 static int __init pasemi_nand_init(void)
232 return of_register_platform_driver(&pasemi_nand_driver);
234 module_init(pasemi_nand_init);
236 static void __exit pasemi_nand_exit(void)
238 of_unregister_platform_driver(&pasemi_nand_driver);
240 module_exit(pasemi_nand_exit);
242 MODULE_LICENSE("GPL");
243 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
244 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");