Pull esi-support into release branch
[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  * $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] = (struct map_info *)kmalloc(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                 memset((void *)map_banks[idx], 0, sizeof(struct map_info));
145                 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
146
147                 if (!map_banks[idx]->name) {
148                         ret = -ENOMEM;
149                         /* FIXME: What if some MTD devices were probed already? */
150                         goto error_mem;
151                 }
152                 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
153
154                 map_banks[idx]->size = flash_size;
155                 map_banks[idx]->bankwidth = 4;
156
157                 simple_map_init(map_banks[idx]);
158
159                 map_banks[idx]->virt = start_scan_addr;
160                 map_banks[idx]->phys = flash_addr;
161                 /* FIXME: This looks utterly bogus, but I'm trying to
162                    preserve the behaviour of the original (shown here)...
163
164                 map_banks[idx]->map_priv_1 =
165                 start_scan_addr + ((idx > 0) ?
166                 (mtd_banks[idx-1] ? mtd_banks[idx-1]->size : 0) : 0);
167                 */
168
169                 if (idx && mtd_banks[idx-1]) {
170                         map_banks[idx]->virt += mtd_banks[idx-1]->size;
171                         map_banks[idx]->phys += mtd_banks[idx-1]->size;
172                 }
173
174                 //start to probe flash chips
175                 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
176
177                 if (mtd_banks[idx]) {
178                         mtd_banks[idx]->owner = THIS_MODULE;
179                         mtd_size += mtd_banks[idx]->size;
180                         num_banks++;
181
182                         printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
183                         mtd_banks[idx]->name, mtd_banks[idx]->size);
184                 }
185         }
186
187         /* no supported flash chips found */
188         if (!num_banks) {
189                 printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
190                 ret = -ENXIO;
191                 goto error_mem;
192         }
193
194 #ifdef CONFIG_MTD_PARTITIONS
195         /*
196          * Select Static partition definitions
197          */
198         part_banks[0].mtd_part = tqm8xxl_partitions;
199         part_banks[0].type = "Static image";
200         part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
201
202         part_banks[1].mtd_part = tqm8xxl_fs_partitions;
203         part_banks[1].type = "Static file system";
204         part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
205
206         for(idx = 0; idx < num_banks ; idx++) {
207                 if (part_banks[idx].nums == 0) {
208                         printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
209                         add_mtd_device(mtd_banks[idx]);
210                 } else {
211                         printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
212                                         idx, part_banks[idx].type);
213                         add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
214                                                                 part_banks[idx].nums);
215                 }
216         }
217 #else
218         printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
219         for(idx = 0 ; idx < num_banks ; idx++)
220                 add_mtd_device(mtd_banks[idx]);
221 #endif
222         return 0;
223 error_mem:
224         for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
225                 if(map_banks[idx] != NULL) {
226                         kfree(map_banks[idx]->name);
227                         map_banks[idx]->name = NULL;
228                         kfree(map_banks[idx]);
229                         map_banks[idx] = NULL;
230                 }
231         }
232 error:
233         iounmap(start_scan_addr);
234         return ret;
235 }
236
237 static void __exit cleanup_tqm_mtd(void)
238 {
239         unsigned int idx = 0;
240         for(idx = 0 ; idx < num_banks ; idx++) {
241                 /* destroy mtd_info previously allocated */
242                 if (mtd_banks[idx]) {
243                         del_mtd_partitions(mtd_banks[idx]);
244                         map_destroy(mtd_banks[idx]);
245                 }
246                 /* release map_info not used anymore */
247                 kfree(map_banks[idx]->name);
248                 kfree(map_banks[idx]);
249         }
250
251         if (start_scan_addr) {
252                 iounmap(start_scan_addr);
253                 start_scan_addr = 0;
254         }
255 }
256
257 module_init(init_tqm_mtd);
258 module_exit(cleanup_tqm_mtd);
259
260 MODULE_LICENSE("GPL");
261 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
262 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");