bas_gigaset: use tasklet_hi_schedule for timing critical tasklets
[linux-2.6] / drivers / mtd / maps / sbc8240.c
1 /*
2  * Handle mapping of the flash memory access routines on the SBC8240 board.
3  *
4  * Carolyn Smith, Tektronix, Inc.
5  *
6  * This code is GPLed
7  */
8
9 /*
10  * The SBC8240 has 2 flash banks.
11  * Bank 0 is a 512 KiB AMD AM29F040B; 8 x 64 KiB sectors.
12  * It contains the U-Boot code (7 sectors) and the environment (1 sector).
13  * Bank 1 is 4 x 1 MiB AMD AM29LV800BT; 15 x 64 KiB sectors, 1 x 32 KiB sector,
14  * 2 x 8 KiB sectors, 1 x 16 KiB sectors.
15  * Both parts are JEDEC compatible.
16  */
17
18 #include <linux/module.h>
19 #include <linux/types.h>
20 #include <linux/kernel.h>
21 #include <asm/io.h>
22
23 #include <linux/mtd/mtd.h>
24 #include <linux/mtd/map.h>
25 #include <linux/mtd/cfi.h>
26
27 #ifdef CONFIG_MTD_PARTITIONS
28 #include <linux/mtd/partitions.h>
29 #endif
30
31 #define DEBUG
32
33 #ifdef  DEBUG
34 # define debugk(fmt,args...)    printk(fmt ,##args)
35 #else
36 # define debugk(fmt,args...)
37 #endif
38
39
40 #define WINDOW_ADDR0    0xFFF00000              /* 512 KiB */
41 #define WINDOW_SIZE0    0x00080000
42 #define BUSWIDTH0       1
43
44 #define WINDOW_ADDR1    0xFF000000              /* 4 MiB */
45 #define WINDOW_SIZE1    0x00400000
46 #define BUSWIDTH1       8
47
48 #define MSG_PREFIX "sbc8240:"   /* prefix for our printk()'s */
49 #define MTDID      "sbc8240-%d" /* for mtdparts= partitioning */
50
51
52 static struct map_info sbc8240_map[2] = {
53         {
54                 .name           = "sbc8240 Flash Bank #0",
55                 .size           = WINDOW_SIZE0,
56                 .bankwidth       = BUSWIDTH0,
57         },
58         {
59                 .name           = "sbc8240 Flash Bank #1",
60                 .size           = WINDOW_SIZE1,
61                 .bankwidth       = BUSWIDTH1,
62         }
63 };
64
65 #define NUM_FLASH_BANKS ARRAY_SIZE(sbc8240_map)
66
67 /*
68  * The following defines the partition layout of SBC8240 boards.
69  *
70  * See include/linux/mtd/partitions.h for definition of the
71  * mtd_partition structure.
72  *
73  * The *_max_flash_size is the maximum possible mapped flash size
74  * which is not necessarily the actual flash size. It must correspond
75  * to the value specified in the mapping definition defined by the
76  * "struct map_desc *_io_desc" for the corresponding machine.
77  */
78
79 #ifdef CONFIG_MTD_PARTITIONS
80
81 static struct mtd_partition sbc8240_uboot_partitions [] = {
82         /* Bank 0 */
83         {
84                 .name = "U-boot",                       /* U-Boot Firmware      */
85                 .offset =       0,
86                 .size = 0x00070000,                     /*  7 x 64 KiB sectors  */
87                 .mask_flags = MTD_WRITEABLE,            /*  force read-only     */
88         },
89         {
90                 .name = "environment",                  /* U-Boot environment   */
91                 .offset =       0x00070000,
92                 .size = 0x00010000,                     /*  1 x 64 KiB sector   */
93         },
94 };
95
96 static struct mtd_partition sbc8240_fs_partitions [] = {
97         {
98                 .name = "jffs",                         /* JFFS  filesystem     */
99                 .offset =       0,
100                 .size = 0x003C0000,                     /*  4 * 15 * 64KiB      */
101         },
102         {
103                 .name = "tmp32",
104                 .offset =       0x003C0000,
105                 .size = 0x00020000,                     /*  4 * 32KiB           */
106         },
107         {
108                 .name = "tmp8a",
109                 .offset =       0x003E0000,
110                 .size = 0x00008000,                     /*  4 * 8KiB            */
111         },
112         {
113                 .name = "tmp8b",
114                 .offset =       0x003E8000,
115                 .size = 0x00008000,                     /*  4 * 8KiB            */
116         },
117         {
118                 .name = "tmp16",
119                 .offset =       0x003F0000,
120                 .size = 0x00010000,                     /*  4 * 16KiB           */
121         }
122 };
123
124 /* trivial struct to describe partition information */
125 struct mtd_part_def
126 {
127         int nums;
128         unsigned char *type;
129         struct mtd_partition* mtd_part;
130 };
131
132 static struct mtd_info *sbc8240_mtd[NUM_FLASH_BANKS];
133 static struct mtd_part_def sbc8240_part_banks[NUM_FLASH_BANKS];
134
135
136 #endif  /* CONFIG_MTD_PARTITIONS */
137
138
139 static int __init init_sbc8240_mtd (void)
140 {
141         static struct _cjs {
142                 u_long addr;
143                 u_long size;
144         } pt[NUM_FLASH_BANKS] = {
145                 {
146                         .addr = WINDOW_ADDR0,
147                         .size = WINDOW_SIZE0
148                 },
149                 {
150                         .addr = WINDOW_ADDR1,
151                         .size = WINDOW_SIZE1
152                 },
153         };
154
155         int devicesfound = 0;
156         int i,j;
157
158         for (i = 0; i < NUM_FLASH_BANKS; i++) {
159                 printk (KERN_NOTICE MSG_PREFIX
160                         "Probing 0x%08lx at 0x%08lx\n", pt[i].size, pt[i].addr);
161
162                 sbc8240_map[i].map_priv_1 =
163                         (unsigned long) ioremap (pt[i].addr, pt[i].size);
164                 if (!sbc8240_map[i].map_priv_1) {
165                         printk (MSG_PREFIX "failed to ioremap\n");
166                         for (j = 0; j < i; j++) {
167                                 iounmap((void *) sbc8240_map[j].map_priv_1);
168                                 sbc8240_map[j].map_priv_1 = 0;
169                         }
170                         return -EIO;
171                 }
172                 simple_map_init(&sbc8240_mtd[i]);
173
174                 sbc8240_mtd[i] = do_map_probe("jedec_probe", &sbc8240_map[i]);
175
176                 if (sbc8240_mtd[i]) {
177                         sbc8240_mtd[i]->module = THIS_MODULE;
178                         devicesfound++;
179                 } else {
180                         if (sbc8240_map[i].map_priv_1) {
181                                 iounmap((void *) sbc8240_map[i].map_priv_1);
182                                 sbc8240_map[i].map_priv_1 = 0;
183                         }
184                 }
185         }
186
187         if (!devicesfound) {
188                 printk(KERN_NOTICE MSG_PREFIX
189                        "No suppported flash chips found!\n");
190                 return -ENXIO;
191         }
192
193 #ifdef CONFIG_MTD_PARTITIONS
194         sbc8240_part_banks[0].mtd_part   = sbc8240_uboot_partitions;
195         sbc8240_part_banks[0].type       = "static image";
196         sbc8240_part_banks[0].nums       = ARRAY_SIZE(sbc8240_uboot_partitions);
197         sbc8240_part_banks[1].mtd_part   = sbc8240_fs_partitions;
198         sbc8240_part_banks[1].type       = "static file system";
199         sbc8240_part_banks[1].nums       = ARRAY_SIZE(sbc8240_fs_partitions);
200
201         for (i = 0; i < NUM_FLASH_BANKS; i++) {
202
203                 if (!sbc8240_mtd[i]) continue;
204                 if (sbc8240_part_banks[i].nums == 0) {
205                         printk (KERN_NOTICE MSG_PREFIX
206                                 "No partition info available, registering whole device\n");
207                         add_mtd_device(sbc8240_mtd[i]);
208                 } else {
209                         printk (KERN_NOTICE MSG_PREFIX
210                                 "Using %s partition definition\n", sbc8240_part_banks[i].mtd_part->name);
211                         add_mtd_partitions (sbc8240_mtd[i],
212                                             sbc8240_part_banks[i].mtd_part,
213                                             sbc8240_part_banks[i].nums);
214                 }
215         }
216 #else
217         printk(KERN_NOTICE MSG_PREFIX
218                "Registering %d flash banks at once\n", devicesfound);
219
220         for (i = 0; i < devicesfound; i++) {
221                 add_mtd_device(sbc8240_mtd[i]);
222         }
223 #endif  /* CONFIG_MTD_PARTITIONS */
224
225         return devicesfound == 0 ? -ENXIO : 0;
226 }
227
228 static void __exit cleanup_sbc8240_mtd (void)
229 {
230         int i;
231
232         for (i = 0; i < NUM_FLASH_BANKS; i++) {
233                 if (sbc8240_mtd[i]) {
234                         del_mtd_device (sbc8240_mtd[i]);
235                         map_destroy (sbc8240_mtd[i]);
236                 }
237                 if (sbc8240_map[i].map_priv_1) {
238                         iounmap ((void *) sbc8240_map[i].map_priv_1);
239                         sbc8240_map[i].map_priv_1 = 0;
240                 }
241         }
242 }
243
244 module_init (init_sbc8240_mtd);
245 module_exit (cleanup_sbc8240_mtd);
246
247 MODULE_LICENSE ("GPL");
248 MODULE_AUTHOR ("Carolyn Smith <carolyn.smith@tektronix.com>");
249 MODULE_DESCRIPTION ("MTD map driver for SBC8240 boards");
250