Merge commit 'kumar/kumar-next' into next
[linux-2.6] / drivers / mtd / maps / tqm8xxl.c
1 /*
2  * Handle mapping of the flash memory access routines
3  * on TQM8xxL based devices.
4  *
5  * based on rpxlite.c
6  *
7  * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
8  *
9  * This code is GPLed
10  *
11  */
12
13 /*
14  * According to TQM8xxL hardware manual, TQM8xxL series have
15  * following flash memory organisations:
16  *      | capacity |    | chip type |   | bank0 |       | bank1 |
17  *          2MiB           512Kx16        2MiB             0
18  *          4MiB           1Mx16          4MiB             0
19  *          8MiB           1Mx16          4MiB             4MiB
20  * Thus, we choose CONFIG_MTD_CFI_I2 & CONFIG_MTD_CFI_B4 at
21  * kernel configuration.
22  */
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28
29 #include <linux/mtd/mtd.h>
30 #include <linux/mtd/map.h>
31 #include <linux/mtd/partitions.h>
32
33 #include <asm/io.h>
34
35 #define FLASH_ADDR 0x40000000
36 #define FLASH_SIZE 0x00800000
37 #define FLASH_BANK_MAX 4
38
39 // trivial struct to describe partition information
40 struct mtd_part_def
41 {
42         int nums;
43         unsigned char *type;
44         struct mtd_partition* mtd_part;
45 };
46
47 //static struct mtd_info *mymtd;
48 static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
49 static struct map_info* map_banks[FLASH_BANK_MAX];
50 static struct mtd_part_def part_banks[FLASH_BANK_MAX];
51 static unsigned long num_banks;
52 static void __iomem *start_scan_addr;
53
54 /*
55  * Here are partition information for all known TQM8xxL series devices.
56  * See include/linux/mtd/partitions.h for definition of the mtd_partition
57  * structure.
58  *
59  * The *_max_flash_size is the maximum possible mapped flash size which
60  * is not necessarily the actual flash size.  It must correspond to the
61  * value specified in the mapping definition defined by the
62  * "struct map_desc *_io_desc" for the corresponding machine.
63  */
64
65 #ifdef CONFIG_MTD_PARTITIONS
66 /* Currently, TQM8xxL has upto 8MiB flash */
67 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
68
69 /* partition definition for first flash bank
70  * (cf. "drivers/char/flash_config.c")
71  */
72 static struct mtd_partition tqm8xxl_partitions[] = {
73         {
74           .name = "ppcboot",
75           .offset = 0x00000000,
76           .size = 0x00020000,           /* 128KB           */
77           .mask_flags = MTD_WRITEABLE,  /* force read-only */
78         },
79         {
80           .name = "kernel",             /* default kernel image */
81           .offset = 0x00020000,
82           .size = 0x000e0000,
83           .mask_flags = MTD_WRITEABLE,  /* force read-only */
84         },
85         {
86           .name = "user",
87           .offset = 0x00100000,
88           .size = 0x00100000,
89         },
90         {
91           .name = "initrd",
92           .offset = 0x00200000,
93           .size = 0x00200000,
94         }
95 };
96 /* partition definition for second flash bank */
97 static struct mtd_partition tqm8xxl_fs_partitions[] = {
98         {
99           .name = "cramfs",
100           .offset = 0x00000000,
101           .size = 0x00200000,
102         },
103         {
104           .name = "jffs",
105           .offset = 0x00200000,
106           .size = 0x00200000,
107           //.size = MTDPART_SIZ_FULL,
108         }
109 };
110 #endif
111
112 static int __init init_tqm_mtd(void)
113 {
114         int idx = 0, ret = 0;
115         unsigned long flash_addr, flash_size, mtd_size = 0;
116         /* pointer to TQM8xxL board info data */
117         bd_t *bd = (bd_t *)__res;
118
119         flash_addr = bd->bi_flashstart;
120         flash_size = bd->bi_flashsize;
121
122         //request maximum flash size address space
123         start_scan_addr = ioremap(flash_addr, flash_size);
124         if (!start_scan_addr) {
125                 printk(KERN_WARNING "%s:Failed to ioremap address:0x%x\n", __func__, flash_addr);
126                 return -EIO;
127         }
128
129         for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
130                 if(mtd_size >= flash_size)
131                         break;
132
133                 printk(KERN_INFO "%s: chip probing count %d\n", __func__, idx);
134
135                 map_banks[idx] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
136                 if(map_banks[idx] == NULL) {
137                         ret = -ENOMEM;
138                         /* FIXME: What if some MTD devices were probed already? */
139                         goto error_mem;
140                 }
141
142                 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
143
144                 if (!map_banks[idx]->name) {
145                         ret = -ENOMEM;
146                         /* FIXME: What if some MTD devices were probed already? */
147                         goto error_mem;
148                 }
149                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
150
151                 map_banks[idx]->size = flash_size;
152                 map_banks[idx]->bankwidth = 4;
153
154                 simple_map_init(map_banks[idx]);
155
156                 map_banks[idx]->virt = start_scan_addr;
157                 map_banks[idx]->phys = flash_addr;
158                 /* FIXME: This looks utterly bogus, but I'm trying to
159                    preserve the behaviour of the original (shown here)...
160
161                 map_banks[idx]->map_priv_1 =
162                 start_scan_addr + ((idx > 0) ?
163                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
164                 */
165
166                 if (idx && mtd_banks[idx-1]) {
167                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
168                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
169                 }
170
171                 //start to probe flash chips
172                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
173
174                 if (mtd_banks[idx]) {
175                         mtd_banks[idx]->owner = THIS_MODULE;
176                         mtd_size += mtd_banks[idx]->size;
177                         num_banks++;
178
179                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __func__, num_banks,
180                         mtd_banks[idx]->name, mtd_banks[idx]->size);
181                 }
182         }
183
184         /* no supported flash chips found */
185         if (!num_banks) {
186                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
187                 ret = -ENXIO;
188                 goto error_mem;
189         }
190
191 #ifdef CONFIG_MTD_PARTITIONS
192         /*
193          * Select Static partition definitions
194          */
195         part_banks[0].mtd_part = tqm8xxl_partitions;
196         part_banks[0].type = "Static image";
197         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
198
199         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
200         part_banks[1].type = "Static file system";
201         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
202
203         for(idx = 0; idx < num_banks ; idx++) {
204                 if (part_banks[idx].nums == 0) {
205                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
206                         add_mtd_device(mtd_banks[idx]);
207                 } else {
208                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
209                                         idx, part_banks[idx].type);
210                         add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
211                                                                 part_banks[idx].nums);
212                 }
213         }
214 #else
215         printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
216         for(idx = 0 ; idx < num_banks ; idx++)
217                 add_mtd_device(mtd_banks[idx]);
218 #endif
219         return 0;
220 error_mem:
221         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
222                 if(map_banks[idx] != NULL) {
223                         kfree(map_banks[idx]->name);
224                         map_banks[idx]->name = NULL;
225                         kfree(map_banks[idx]);
226                         map_banks[idx] = NULL;
227                 }
228         }
229 error:
230         iounmap(start_scan_addr);
231         return ret;
232 }
233
234 static void __exit cleanup_tqm_mtd(void)
235 {
236         unsigned int idx = 0;
237         for(idx = 0 ; idx < num_banks ; idx++) {
238                 /* destroy mtd_info previously allocated */
239                 if (mtd_banks[idx]) {
240                         del_mtd_partitions(mtd_banks[idx]);
241                         map_destroy(mtd_banks[idx]);
242                 }
243                 /* release map_info not used anymore */
244                 kfree(map_banks[idx]->name);
245                 kfree(map_banks[idx]);
246         }
247
248         if (start_scan_addr) {
249                 iounmap(start_scan_addr);
250                 start_scan_addr = 0;
251         }
252 }
253
254 module_init(init_tqm_mtd);
255 module_exit(cleanup_tqm_mtd);
256
257 MODULE_LICENSE("GPL");
258 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
259 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");