blob: dbfe17baf0463a7e47325f2b228487e29e28391c [file] [log] [blame]
Alexey Korolev8dc00432008-12-16 18:11:51 +00001/*
2 * Probing flash chips with QINFO records.
3 * (C) 2008 Korolev Alexey <akorolev@infradead.org>
4 * (C) 2008 Vasiliy Leonenko <vasiliy.leonenko@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 * 02110-1301, USA.
20 */
21#include <linux/module.h>
22#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/errno.h>
26#include <linux/slab.h>
27#include <linux/interrupt.h>
28
29#include <linux/mtd/xip.h>
30#include <linux/mtd/map.h>
31#include <linux/mtd/pfow.h>
32#include <linux/mtd/qinfo.h>
33
34static int lpddr_chip_setup(struct map_info *map, struct lpddr_private *lpddr);
35struct mtd_info *lpddr_probe(struct map_info *map);
36static struct lpddr_private *lpddr_probe_chip(struct map_info *map);
37static int lpddr_pfow_present(struct map_info *map,
38 struct lpddr_private *lpddr);
39
40static struct qinfo_query_info qinfo_array[] = {
41 /* General device info */
42 {0, 0, "DevSizeShift", "Device size 2^n bytes"},
43 {0, 3, "BufSizeShift", "Program buffer size 2^n bytes"},
44 /* Erase block information */
45 {1, 1, "TotalBlocksNum", "Total number of blocks"},
46 {1, 2, "UniformBlockSizeShift", "Uniform block size 2^n bytes"},
47 /* Partition information */
48 {2, 1, "HWPartsNum", "Number of hardware partitions"},
49 /* Optional features */
50 {5, 1, "SuspEraseSupp", "Suspend erase supported"},
51 /* Operation typical time */
52 {10, 0, "SingleWordProgTime", "Single word program 2^n u-sec"},
53 {10, 1, "ProgBufferTime", "Program buffer write 2^n u-sec"},
54 {10, 2, "BlockEraseTime", "Block erase 2^n m-sec"},
55 {10, 3, "FullChipEraseTime", "Full chip erase 2^n m-sec"},
56};
57
58static long lpddr_get_qinforec_pos(struct map_info *map, char *id_str)
59{
60 int qinfo_lines = sizeof(qinfo_array)/sizeof(struct qinfo_query_info);
61 int i;
62 int bankwidth = map_bankwidth(map) * 8;
63 int major, minor;
64
65 for (i = 0; i < qinfo_lines; i++) {
66 if (strcmp(id_str, qinfo_array[i].id_str) == 0) {
67 major = qinfo_array[i].major & ((1 << bankwidth) - 1);
68 minor = qinfo_array[i].minor & ((1 << bankwidth) - 1);
69 return minor | (major << bankwidth);
70 }
71 }
72 printk(KERN_ERR"%s qinfo id string is wrong! \n", map->name);
73 BUG();
74 return -1;
75}
76
77static uint16_t lpddr_info_query(struct map_info *map, char *id_str)
78{
79 unsigned int dsr, val;
80 int bits_per_chip = map_bankwidth(map) * 8;
81 unsigned long adr = lpddr_get_qinforec_pos(map, id_str);
82 int attempts = 20;
83
84 /* Write a request for the PFOW record */
85 map_write(map, CMD(LPDDR_INFO_QUERY),
86 map->pfow_base + PFOW_COMMAND_CODE);
87 map_write(map, CMD(adr & ((1 << bits_per_chip) - 1)),
88 map->pfow_base + PFOW_COMMAND_ADDRESS_L);
89 map_write(map, CMD(adr >> bits_per_chip),
90 map->pfow_base + PFOW_COMMAND_ADDRESS_H);
91 map_write(map, CMD(LPDDR_START_EXECUTION),
92 map->pfow_base + PFOW_COMMAND_EXECUTE);
93
94 while ((attempts--) > 0) {
95 dsr = CMDVAL(map_read(map, map->pfow_base + PFOW_DSR));
96 if (dsr & DSR_READY_STATUS)
97 break;
98 udelay(10);
99 }
100
101 val = CMDVAL(map_read(map, map->pfow_base + PFOW_COMMAND_DATA));
102 return val;
103}
104
105static int lpddr_pfow_present(struct map_info *map, struct lpddr_private *lpddr)
106{
107 map_word pfow_val[4];
108
109 /* Check identification string */
110 pfow_val[0] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_P);
111 pfow_val[1] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_F);
112 pfow_val[2] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_O);
113 pfow_val[3] = map_read(map, map->pfow_base + PFOW_QUERY_STRING_W);
114
115 if (!map_word_equal(map, CMD('P'), pfow_val[0]))
116 goto out;
117
118 if (!map_word_equal(map, CMD('F'), pfow_val[1]))
119 goto out;
120
121 if (!map_word_equal(map, CMD('O'), pfow_val[2]))
122 goto out;
123
124 if (!map_word_equal(map, CMD('W'), pfow_val[3]))
125 goto out;
126
127 return 1; /* "PFOW" is found */
128out:
129 printk(KERN_WARNING"%s: PFOW string at 0x%lx is not found \n",
130 map->name, map->pfow_base);
131 return 0;
132}
133
134static int lpddr_chip_setup(struct map_info *map, struct lpddr_private *lpddr)
135{
136
Julia Lawall2bfefa42010-05-13 22:03:15 +0200137 lpddr->qinfo = kzalloc(sizeof(struct qinfo_chip), GFP_KERNEL);
Alexey Korolev8dc00432008-12-16 18:11:51 +0000138 if (!lpddr->qinfo) {
139 printk(KERN_WARNING "%s: no memory for LPDDR qinfo structure\n",
140 map->name);
141 return 0;
142 }
Alexey Korolev8dc00432008-12-16 18:11:51 +0000143
144 /* Get the ManuID */
145 lpddr->ManufactId = CMDVAL(map_read(map, map->pfow_base + PFOW_MANUFACTURER_ID));
146 /* Get the DeviceID */
147 lpddr->DevId = CMDVAL(map_read(map, map->pfow_base + PFOW_DEVICE_ID));
148 /* read parameters from chip qinfo table */
149 lpddr->qinfo->DevSizeShift = lpddr_info_query(map, "DevSizeShift");
150 lpddr->qinfo->TotalBlocksNum = lpddr_info_query(map, "TotalBlocksNum");
151 lpddr->qinfo->BufSizeShift = lpddr_info_query(map, "BufSizeShift");
152 lpddr->qinfo->HWPartsNum = lpddr_info_query(map, "HWPartsNum");
153 lpddr->qinfo->UniformBlockSizeShift =
154 lpddr_info_query(map, "UniformBlockSizeShift");
155 lpddr->qinfo->SuspEraseSupp = lpddr_info_query(map, "SuspEraseSupp");
156 lpddr->qinfo->SingleWordProgTime =
157 lpddr_info_query(map, "SingleWordProgTime");
158 lpddr->qinfo->ProgBufferTime = lpddr_info_query(map, "ProgBufferTime");
159 lpddr->qinfo->BlockEraseTime = lpddr_info_query(map, "BlockEraseTime");
160 return 1;
161}
162static struct lpddr_private *lpddr_probe_chip(struct map_info *map)
163{
164 struct lpddr_private lpddr;
165 struct lpddr_private *retlpddr;
166 int numvirtchips;
167
168
169 if ((map->pfow_base + 0x1000) >= map->size) {
170 printk(KERN_NOTICE"%s Probe at base (0x%08lx) past the end of"
171 "the map(0x%08lx)\n", map->name,
172 (unsigned long)map->pfow_base, map->size - 1);
173 return NULL;
174 }
175 memset(&lpddr, 0, sizeof(struct lpddr_private));
176 if (!lpddr_pfow_present(map, &lpddr))
177 return NULL;
178
179 if (!lpddr_chip_setup(map, &lpddr))
180 return NULL;
181
182 /* Ok so we found a chip */
183 lpddr.chipshift = lpddr.qinfo->DevSizeShift;
184 lpddr.numchips = 1;
185
186 numvirtchips = lpddr.numchips * lpddr.qinfo->HWPartsNum;
Julia Lawall2bfefa42010-05-13 22:03:15 +0200187 retlpddr = kzalloc(sizeof(struct lpddr_private) +
Alexey Korolev8dc00432008-12-16 18:11:51 +0000188 numvirtchips * sizeof(struct flchip), GFP_KERNEL);
189 if (!retlpddr)
190 return NULL;
191
Alexey Korolev8dc00432008-12-16 18:11:51 +0000192 memcpy(retlpddr, &lpddr, sizeof(struct lpddr_private));
193
194 retlpddr->numchips = numvirtchips;
195 retlpddr->chipshift = retlpddr->qinfo->DevSizeShift -
196 __ffs(retlpddr->qinfo->HWPartsNum);
197
198 return retlpddr;
199}
200
201struct mtd_info *lpddr_probe(struct map_info *map)
202{
203 struct mtd_info *mtd = NULL;
204 struct lpddr_private *lpddr;
205
206 /* First probe the map to see if we havecan open PFOW here */
207 lpddr = lpddr_probe_chip(map);
208 if (!lpddr)
209 return NULL;
210
211 map->fldrv_priv = lpddr;
212 mtd = lpddr_cmdset(map);
213 if (mtd) {
214 if (mtd->size > map->size) {
215 printk(KERN_WARNING "Reducing visibility of %ldKiB chip"
216 "to %ldKiB\n", (unsigned long)mtd->size >> 10,
217 (unsigned long)map->size >> 10);
218 mtd->size = map->size;
219 }
220 return mtd;
221 }
222
223 kfree(lpddr->qinfo);
224 kfree(lpddr);
225 map->fldrv_priv = NULL;
226 return NULL;
227}
228
229static struct mtd_chip_driver lpddr_chipdrv = {
230 .probe = lpddr_probe,
231 .name = "qinfo_probe",
232 .module = THIS_MODULE
233};
234
235static int __init lpddr_probe_init(void)
236{
237 register_mtd_chip_driver(&lpddr_chipdrv);
238 return 0;
239}
240
241static void __exit lpddr_probe_exit(void)
242{
243 unregister_mtd_chip_driver(&lpddr_chipdrv);
244}
245
246module_init(lpddr_probe_init);
247module_exit(lpddr_probe_exit);
248
249MODULE_LICENSE("GPL");
250MODULE_AUTHOR("Vasiliy Leonenko <vasiliy.leonenko@gmail.com>");
251MODULE_DESCRIPTION("Driver to probe qinfo flash chips");
252