blob: a8b9376cf32404a9257fc8c4a1c97d9f1c8d8f36 [file] [log] [blame]
Egor Martovetsky846fc312007-11-28 18:37:31 -06001/*
2 * Copyright (C) 2006-2007 PA Semi, Inc
3 *
4 * Author: Egor Martovetsky <egor@pasemi.com>
5 * Maintained by: Olof Johansson <olof@lixom.net>
6 *
7 * Driver for the PWRficient onchip NAND flash interface
8 *
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.
12 *
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.
17 *
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
21 */
22
23#undef DEBUG
24
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>
34
35#include <asm/io.h>
36
37#define LBICTRL_LPCCTL_NR 0x00004000
38#define CLE_PIN_CTL 15
39#define ALE_PIN_CTL 14
40
41static unsigned int lpcctl;
42static struct mtd_info *pasemi_nand_mtd;
43static const char driver_name[] = "pasemi-nand";
44
45static void pasemi_read_buf(struct mtd_info *mtd, u_char *buf, int len)
46{
47 struct nand_chip *chip = mtd->priv;
48
49 while (len > 0x800) {
50 memcpy_fromio(buf, chip->IO_ADDR_R, 0x800);
51 buf += 0x800;
52 len -= 0x800;
53 }
54 memcpy_fromio(buf, chip->IO_ADDR_R, len);
55}
56
57static void pasemi_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
58{
59 struct nand_chip *chip = mtd->priv;
60
61 while (len > 0x800) {
62 memcpy_toio(chip->IO_ADDR_R, buf, 0x800);
63 buf += 0x800;
64 len -= 0x800;
65 }
66 memcpy_toio(chip->IO_ADDR_R, buf, len);
67}
68
69static void pasemi_hwcontrol(struct mtd_info *mtd, int cmd,
70 unsigned int ctrl)
71{
72 struct nand_chip *chip = mtd->priv;
73
74 if (cmd == NAND_CMD_NONE)
75 return;
76
77 if (ctrl & NAND_CLE)
78 out_8(chip->IO_ADDR_W + (1 << CLE_PIN_CTL), cmd);
79 else
80 out_8(chip->IO_ADDR_W + (1 << ALE_PIN_CTL), cmd);
81
82 /* Push out posted writes */
83 eieio();
84 inl(lpcctl);
85}
86
87int pasemi_device_ready(struct mtd_info *mtd)
88{
89 return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
90}
91
92static int __devinit pasemi_nand_probe(struct of_device *ofdev,
93 const struct of_device_id *match)
94{
95 struct pci_dev *pdev;
96 struct device_node *np = ofdev->node;
97 struct resource res;
98 struct nand_chip *chip;
99 int err = 0;
100
101 err = of_address_to_resource(np, 0, &res);
102
103 if (err)
104 return -EINVAL;
105
106 /* We only support one device at the moment */
107 if (pasemi_nand_mtd)
108 return -ENODEV;
109
Stephen Rothwell4712fff2009-01-21 13:16:28 +0000110 pr_debug("pasemi_nand at %llx-%llx\n", res.start, res.end);
Egor Martovetsky846fc312007-11-28 18:37:31 -0600111
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) {
116 printk(KERN_WARNING
117 "Unable to allocate PASEMI NAND MTD device structure\n");
118 err = -ENOMEM;
119 goto out;
120 }
121
122 /* Get pointer to private data */
123 chip = (struct nand_chip *)&pasemi_nand_mtd[1];
124
125 /* Link the private data with the MTD structure */
126 pasemi_nand_mtd->priv = chip;
127 pasemi_nand_mtd->owner = THIS_MODULE;
128
129 chip->IO_ADDR_R = of_iomap(np, 0);
130 chip->IO_ADDR_W = chip->IO_ADDR_R;
131
132 if (!chip->IO_ADDR_R) {
133 err = -EIO;
134 goto out_mtd;
135 }
136
137 pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa008, NULL);
138 if (!pdev) {
139 err = -ENODEV;
140 goto out_ior;
141 }
142
143 lpcctl = pci_resource_start(pdev, 0);
Julia Lawalld9476292008-12-01 23:00:55 +0100144 pci_dev_put(pdev);
Egor Martovetsky846fc312007-11-28 18:37:31 -0600145
146 if (!request_region(lpcctl, 4, driver_name)) {
147 err = -EBUSY;
148 goto out_ior;
149 }
150
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;
157
158 /* Enable the following for a flash based bad block table */
159 chip->options = NAND_USE_FLASH_BBT | NAND_NO_AUTOINCR;
160
161 /* Scan to find existance of the device */
162 if (nand_scan(pasemi_nand_mtd, 1)) {
163 err = -ENXIO;
164 goto out_lpc;
165 }
166
167 if (add_mtd_device(pasemi_nand_mtd)) {
168 printk(KERN_ERR "pasemi_nand: Unable to register MTD device\n");
169 err = -ENODEV;
170 goto out_lpc;
171 }
172
Stephen Rothwell4712fff2009-01-21 13:16:28 +0000173 printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
Egor Martovetsky846fc312007-11-28 18:37:31 -0600174 res.start, lpcctl);
175
176 return 0;
177
178 out_lpc:
179 release_region(lpcctl, 4);
180 out_ior:
181 iounmap(chip->IO_ADDR_R);
182 out_mtd:
183 kfree(pasemi_nand_mtd);
184 out:
185 return err;
186}
187
188static int __devexit pasemi_nand_remove(struct of_device *ofdev)
189{
190 struct nand_chip *chip;
191
192 if (!pasemi_nand_mtd)
193 return 0;
194
195 chip = pasemi_nand_mtd->priv;
196
197 /* Release resources, unregister device */
198 nand_release(pasemi_nand_mtd);
199
200 release_region(lpcctl, 4);
201
202 iounmap(chip->IO_ADDR_R);
203
204 /* Free the MTD device structure */
205 kfree(pasemi_nand_mtd);
206
207 pasemi_nand_mtd = NULL;
208
209 return 0;
210}
211
212static struct of_device_id pasemi_nand_match[] =
213{
214 {
215 .compatible = "pasemi,localbus-nand",
216 },
217 {},
218};
219
220MODULE_DEVICE_TABLE(of, pasemi_nand_match);
221
222static struct of_platform_driver pasemi_nand_driver =
223{
224 .name = (char*)driver_name,
225 .match_table = pasemi_nand_match,
226 .probe = pasemi_nand_probe,
227 .remove = pasemi_nand_remove,
228};
229
230static int __init pasemi_nand_init(void)
231{
232 return of_register_platform_driver(&pasemi_nand_driver);
233}
234module_init(pasemi_nand_init);
235
236static void __exit pasemi_nand_exit(void)
237{
238 of_unregister_platform_driver(&pasemi_nand_driver);
239}
240module_exit(pasemi_nand_exit);
241
242MODULE_LICENSE("GPL");
243MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
244MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");