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_address.h>
32 #include <linux/of_irq.h>
33 #include <linux/of_platform.h>
34 #include <linux/platform_device.h>
35 #include <linux/pci.h>
39 #define LBICTRL_LPCCTL_NR 0x00004000
40 #define CLE_PIN_CTL 15
41 #define ALE_PIN_CTL 14
43 static unsigned int lpcctl;
44 static struct mtd_info *pasemi_nand_mtd;
45 static const char driver_name[] = "pasemi-nand";
47 static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
49 struct nand_chip *chip = mtd->priv;
52 memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
56 memcpy_fromio(buf, chip->IO_ADDR_R, len);
59 static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
61 struct nand_chip *chip = mtd->priv;
64 memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
68 memcpy_toio(chip->IO_ADDR_R, buf, len);
71 static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
74 struct nand_chip *chip = mtd->priv;
76 if (cmd == NAND_CMD_NONE)
80 out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
82 out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
84 /* Push out posted writes */
89 int pasemi_device_ready(struct mtd_info *mtd)
91 return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
94 static int pasemi_nand_probe(struct platform_device *ofdev)
97 struct device_node *np = ofdev->dev.of_node;
99 struct nand_chip *chip;
102 err = of_address_to_resource(np, 0, &res);
107 /* We only support one device at the moment */
111 pr_debug("pasemi_nand at %pR\n", &res);
113 /* Allocate memory for MTD device structure and private data */
114 pasemi_nand_mtd = kzalloc(sizeof(struct mtd_info) +
115 sizeof(struct nand_chip), GFP_KERNEL);
116 if (!pasemi_nand_mtd) {
118 "Unable to allocate PASEMI NAND MTD device structure\n");
123 /* Get pointer to private data */
124 chip = (struct nand_chip *)&pasemi_nand_mtd[1];
126 /* Link the private data with the MTD structure */
127 pasemi_nand_mtd->priv = chip;
128 pasemi_nand_mtd->owner = THIS_MODULE;
130 chip->IO_ADDR_R = of_iomap(np, 0);
131 chip->IO_ADDR_W = chip->IO_ADDR_R;
133 if (!chip->IO_ADDR_R) {
138 pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
144 lpcctl = pci_resource_start(pdev, 0);
147 if (!request_region(lpcctl, 4, driver_name)) {
152 chip->cmd_ctrl = pasemi_hwcontrol;
153 chip->dev_ready = pasemi_device_ready;
154 chip->read_buf = pasemi_read_buf;
155 chip->write_buf = pasemi_write_buf;
156 chip->chip_delay = 0;
157 chip->ecc.mode = NAND_ECC_SOFT;
159 /* Enable the following for a flash based bad block table */
160 chip->bbt_options = NAND_BBT_USE_FLASH;
162 /* Scan to find existence of the device */
163 if (nand_scan(pasemi_nand_mtd, 1)) {
168 if (mtd_device_register(pasemi_nand_mtd, NULL, 0)) {
169 printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
174 printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
180 release_region(lpcctl, 4);
182 iounmap(chip->IO_ADDR_R);
184 kfree(pasemi_nand_mtd);
189 static int pasemi_nand_remove(struct platform_device *ofdev)
191 struct nand_chip *chip;
193 if (!pasemi_nand_mtd)
196 chip = pasemi_nand_mtd->priv;
198 /* Release resources, unregister device */
199 nand_release(pasemi_nand_mtd);
201 release_region(lpcctl, 4);
203 iounmap(chip->IO_ADDR_R);
205 /* Free the MTD device structure */
206 kfree(pasemi_nand_mtd);
208 pasemi_nand_mtd = NULL;
213 static const struct of_device_id pasemi_nand_match[] =
216 .compatible = "pasemi,localbus-nand",
221 MODULE_DEVICE_TABLE(of, pasemi_nand_match);
223 static struct platform_driver pasemi_nand_driver =
227 .owner = THIS_MODULE,
228 .of_match_table = pasemi_nand_match,
230 .probe = pasemi_nand_probe,
231 .remove = pasemi_nand_remove,
234 module_platform_driver(pasemi_nand_driver);
236 MODULE_LICENSE("GPL");
237 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
238 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");