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