1 /*
2 * Handle mapping of the flash memory access routines
3 * on TQM8xxL based devices.
4 *
5 * $Id: tqm8xxl.c,v 1.15 2005/11/07 11:14:28 gleixner Exp $
6 *
7 * based on rpxlite.c
8 *
9 * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
10 *
11 * This code is GPLed
12 *
13 */
14
15 /*
16 * According to TQM8xxL hardware manual, TQM8xxL series have
17 * following flash memory organisations:
18 * | capacity | | chip type | | bank0 | | bank1 |
19 * 2MiB 512Kx16 2MiB 0
20 * 4MiB 1Mx16 4MiB 0
21 * 8MiB 1Mx16 4MiB 4MiB
22 * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
23 * kernel configuration.
24 */
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/slab.h>
30
31 #include <linux/mtd/mtd.h>
32 #include <linux/mtd/map.h>
33 #include <linux/mtd/partitions.h>
34
35 #include <asm/io.h>
36
37 #define FLASH_ADDR 0x40000000
38 #define FLASH_SIZE 0x00800000
39 #define FLASH_BANK_MAX 4
40
41 // trivial struct to describe partition information
42 struct mtd_part_def
43 {
44 int nums;
45 unsigned char *type;
46 struct mtd_partition* mtd_part;
47 };
48
49 //static struct mtd_info *mymtd;
50 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
51 static struct map_info* map_banks[FLASH_BANK_MAX];
52 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
53 static unsigned long num_banks;
54 static void __iomem *start_scan_addr;
55
56 /*
57 * Here are partition information for all known TQM8xxL series devices.
58 * See include/linux/mtd/partitions.h for definition of the mtd_partition
59 * structure.
60 *
61 * The *_max_flash_size is the maximum possible mapped flash size which
62 * is not necessarily the actual flash size. It must correspond to the
63 * value specified in the mapping definition defined by the
64 * "struct map_desc *_io_desc" for the corresponding machine.
65 */
66
67 #ifdef CONFIG_MTD_PARTITIONS
68 /* Currently, TQM8xxL has upto 8MiB flash */
69 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
70
71 /* partition definition for first flash bank
72 * (cf. "drivers/char/flash_config.c")
73 */
74 static struct mtd_partition tqm8xxl_partitions[] = {
75 {
76 .name = "ppcboot",
77 .offset = 0x00000000,
78 .size = 0x00020000, /* 128KB */
79 .mask_flags = MTD_WRITEABLE, /* force read-only */
80 },
81 {
82 .name = "kernel", /* default kernel image */
83 .offset = 0x00020000,
84 .size = 0x000e0000,
85 .mask_flags = MTD_WRITEABLE, /* force read-only */
86 },
87 {
88 .name = "user",
89 .offset = 0x00100000,
90 .size = 0x00100000,
91 },
92 {
93 .name = "initrd",
94 .offset = 0x00200000,
95 .size = 0x00200000,
96 }
97 };
98 /* partition definition for second flash bank */
99 static struct mtd_partition tqm8xxl_fs_partitions[] = {
100 {
101 .name = "cramfs",
102 .offset = 0x00000000,
103 .size = 0x00200000,
104 },
105 {
106 .name = "jffs",
107 .offset = 0x00200000,
108 .size = 0x00200000,
109 //.size = MTDPART_SIZ_FULL,
110 }
111 };
112 #endif
113
114 int __init init_tqm_mtd(void)
115 {
116 int idx = 0, ret = 0;
117 unsigned long flash_addr, flash_size, mtd_size = 0;
118 /* pointer to TQM8xxL board info data */
119 bd_t *bd = (bd_t *)__res;
120
121 flash_addr = bd->bi_flashstart;
122 flash_size = bd->bi_flashsize;
123
124 //request maximum flash size address space
125 start_scan_addr = ioremap(flash_addr, flash_size);
126 if (!start_scan_addr) {
127 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __FUNCTION__, flash_addr);
128 return -EIO;
129 }
130
131 for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
132 if(mtd_size >= flash_size)
133 break;
134
135 printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);
136
137 map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
138 if(map_banks[idx] == NULL) {
139 ret = -ENOMEM;
140 /* FIXME: What if some MTD devices were probed already? */
141 goto error_mem;
142 }
143
144 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
145
146 if (!map_banks[idx]->name) {
147 ret = -ENOMEM;
148 /* FIXME: What if some MTD devices were probed already? */
149 goto error_mem;
150 }
151 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
152
153 map_banks[idx]->size = flash_size;
154 map_banks[idx]->bankwidth = 4;
155
156 simple_map_init(map_banks[idx]);
157
158 map_banks[idx]->virt = start_scan_addr;
159 map_banks[idx]->phys = flash_addr;
160 /* FIXME: This looks utterly bogus, but I'm trying to
161 preserve the behaviour of the original (shown here)...
162
163 map_banks[idx]->map_priv_1 =
164 start_scan_addr + ((idx > 0) ?
165 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
166 */
167
168 if (idx && mtd_banks[idx-1]) {
169 map_banks[idx]->virt += mtd_banks[idx-1]->size;
170 map_banks[idx]->phys += mtd_banks[idx-1]->size;
171 }
172
173 //start to probe flash chips
174 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
175
176 if (mtd_banks[idx]) {
177 mtd_banks[idx]->owner = THIS_MODULE;
178 mtd_size += mtd_banks[idx]->size;
179 num_banks++;
180
181 printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
182 mtd_banks[idx]->name, mtd_banks[idx]->size);
183 }
184 }
185
186 /* no supported flash chips found */
187 if (!num_banks) {
188 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
189 ret = -ENXIO;
190 goto error_mem;
191 }
192
193 #ifdef CONFIG_MTD_PARTITIONS
194 /*
195 * Select Static partition definitions
196 */
197 part_banks[0].mtd_part = tqm8xxl_partitions;
198 part_banks[0].type = "Static image";
199 part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
200
201 part_banks[1].mtd_part = tqm8xxl_fs_partitions;
202 part_banks[1].type = "Static file system";
203 part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
204
205 for(idx = 0; idx < num_banks ; idx++) {
206 if (part_banks[idx].nums == 0) {
207 printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
208 add_mtd_device(mtd_banks[idx]);
209 } else {
210 printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
211 idx, part_banks[idx].type);
212 add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
213 part_banks[idx].nums);
214 }
215 }
216 #else
217 printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
218 for(idx = 0 ; idx < num_banks ; idx++)
219 add_mtd_device(mtd_banks[idx]);
220 #endif
221 return 0;
222 error_mem:
223 for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
224 if(map_banks[idx] != NULL) {
225 kfree(map_banks[idx]->name);
226 map_banks[idx]->name = NULL;
227 kfree(map_banks[idx]);
228 map_banks[idx] = NULL;
229 }
230 }
231 error:
232 iounmap(start_scan_addr);
233 return ret;
234 }
235
236 static void __exit cleanup_tqm_mtd(void)
237 {
238 unsigned int idx = 0;
239 for(idx = 0 ; idx < num_banks ; idx++) {
240 /* destroy mtd_info previously allocated */
241 if (mtd_banks[idx]) {
242 del_mtd_partitions(mtd_banks[idx]);
243 map_destroy(mtd_banks[idx]);
244 }
245 /* release map_info not used anymore */
246 kfree(map_banks[idx]->name);
247 kfree(map_banks[idx]);
248 }
249
250 if (start_scan_addr) {
251 iounmap(start_scan_addr);
252 start_scan_addr = 0;
253 }
254 }
255
256 module_init(init_tqm_mtd);
257 module_exit(cleanup_tqm_mtd);
258
259 MODULE_LICENSE("GPL");
260 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
261 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");
262
|
This page was automatically generated by the
LXR engine.
|