Merge remote branch 'origin' into secretlab/next-devicetree
[pandora-kernel.git] / drivers / mtd / nand / pasemi_nand.c
1 /*
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
41 static unsigned int lpcctl;
42 static struct mtd_info *pasemi_nand_mtd;
43 static const char driver_name[] = "pasemi-nand";
44
45 static 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
57 static 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
69 static 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
87 int pasemi_device_ready(struct mtd_info *mtd)
88 {
89         return !!(inl(lpcctl) & LBICTRL_LPCCTL_NR);
90 }
91
92 static 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->dev.of_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
110         pr_debug("pasemi_nand at %llx-%llx\n", res.start, res.end);
111
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);
144         pci_dev_put(pdev);
145
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
173         printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n",
174                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
188 static 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
212 static const struct of_device_id pasemi_nand_match[] =
213 {
214         {
215                 .compatible   = "pasemi,localbus-nand",
216         },
217         {},
218 };
219
220 MODULE_DEVICE_TABLE(of, pasemi_nand_match);
221
222 static struct of_platform_driver pasemi_nand_driver =
223 {
224         .driver = {
225                 .name = (char*)driver_name,
226                 .owner = THIS_MODULE,
227                 .of_match_table = pasemi_nand_match,
228         },
229         .probe          = pasemi_nand_probe,
230         .remove         = pasemi_nand_remove,
231 };
232
233 static int __init pasemi_nand_init(void)
234 {
235         return of_register_platform_driver(&pasemi_nand_driver);
236 }
237 module_init(pasemi_nand_init);
238
239 static void __exit pasemi_nand_exit(void)
240 {
241         of_unregister_platform_driver(&pasemi_nand_driver);
242 }
243 module_exit(pasemi_nand_exit);
244
245 MODULE_LICENSE("GPL");
246 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
247 MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient");