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846fc31d EM |
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; | |
61c7a080 | 96 | struct device_node *np = ofdev->dev.of_node; |
846fc31d EM |
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 | ||
4712fff9 | 110 | pr_debug("pasemi_nand at %llx-%llx\n", res.start, res.end); |
846fc31d EM |
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); | |
d9476298 | 144 | pci_dev_put(pdev); |
846fc31d EM |
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 | ||
4712fff9 | 173 | printk(KERN_INFO "PA Semi NAND flash at %08llx, control at I/O %x\n", |
846fc31d EM |
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 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 | .name = (char*)driver_name, | |
225 | .match_table = pasemi_nand_match, | |
226 | .probe = pasemi_nand_probe, | |
227 | .remove = pasemi_nand_remove, | |
228 | }; | |
229 | ||
230 | static int __init pasemi_nand_init(void) | |
231 | { | |
232 | return of_register_platform_driver(&pasemi_nand_driver); | |
233 | } | |
234 | module_init(pasemi_nand_init); | |
235 | ||
236 | static void __exit pasemi_nand_exit(void) | |
237 | { | |
238 | of_unregister_platform_driver(&pasemi_nand_driver); | |
239 | } | |
240 | module_exit(pasemi_nand_exit); | |
241 | ||
242 | MODULE_LICENSE("GPL"); | |
243 | MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>"); | |
244 | MODULE_DESCRIPTION("NAND flash interface driver for PA Semi PWRficient"); |