[PATCH] arch/sparc64/Kconfig: fix HUGETLB_PAGE_SIZE_64K dependencies
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mtd / maps / tqm8xxl.c
bloba43517053e7cfe4819a51f0c1974ffc767ef8251
1 /*
2 * Handle mapping of the flash memory access routines
3 * on TQM8xxL based devices.
5 * $Id: tqm8xxl.c,v 1.15 2005/11/07 11:14:28 gleixner Exp $
7 * based on rpxlite.c
9 * Copyright(C) 2001 Kirk Lee <kirk@hpc.ee.ntu.edu.tw>
11 * This code is GPLed
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.
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>
32 #include <linux/mtd/mtd.h>
33 #include <linux/mtd/map.h>
34 #include <linux/mtd/partitions.h>
36 #include <asm/io.h>
38 #define FLASH_ADDR 0x40000000
39 #define FLASH_SIZE 0x00800000
40 #define FLASH_BANK_MAX 4
42 // trivial struct to describe partition information
43 struct mtd_part_def
45 int nums;
46 unsigned char *type;
47 struct mtd_partition* mtd_part;
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;
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.
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.
68 #ifdef CONFIG_MTD_PARTITIONS
69 /* Currently, TQM8xxL has upto 8MiB flash */
70 static unsigned long tqm8xxl_max_flash_size = 0x00800000;
72 /* partition definition for first flash bank
73 * (cf. "drivers/char/flash_config.c")
75 static struct mtd_partition tqm8xxl_partitions[] = {
77 .name = "ppcboot",
78 .offset = 0x00000000,
79 .size = 0x00020000, /* 128KB */
80 .mask_flags = MTD_WRITEABLE, /* force read-only */
83 .name = "kernel", /* default kernel image */
84 .offset = 0x00020000,
85 .size = 0x000e0000,
86 .mask_flags = MTD_WRITEABLE, /* force read-only */
89 .name = "user",
90 .offset = 0x00100000,
91 .size = 0x00100000,
94 .name = "initrd",
95 .offset = 0x00200000,
96 .size = 0x00200000,
99 /* partition definition for second flash bank */
100 static struct mtd_partition tqm8xxl_fs_partitions[] = {
102 .name = "cramfs",
103 .offset = 0x00000000,
104 .size = 0x00200000,
107 .name = "jffs",
108 .offset = 0x00200000,
109 .size = 0x00200000,
110 //.size = MTDPART_SIZ_FULL,
113 #endif
115 int __init init_tqm_mtd(void)
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;
122 flash_addr = bd->bi_flashstart;
123 flash_size = bd->bi_flashsize;
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;
132 for (idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
133 if(mtd_size >= flash_size)
134 break;
136 printk(KERN_INFO "%s: chip probing count %d\n", __FUNCTION__, idx);
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;
145 memset((void *)map_banks[idx], 0, sizeof(struct map_info));
146 map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
148 if (!map_banks[idx]->name) {
149 ret = -ENOMEM;
150 /* FIXME: What if some MTD devices were probed already? */
151 goto error_mem;
153 sprintf(map_banks[idx]->name, "TQM8xxL%d", idx);
155 map_banks[idx]->size = flash_size;
156 map_banks[idx]->bankwidth = 4;
158 simple_map_init(map_banks[idx]);
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)...
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);
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;
175 //start to probe flash chips
176 mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
178 if (mtd_banks[idx]) {
179 mtd_banks[idx]->owner = THIS_MODULE;
180 mtd_size += mtd_banks[idx]->size;
181 num_banks++;
183 printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
184 mtd_banks[idx]->name, mtd_banks[idx]->size);
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;
195 #ifdef CONFIG_MTD_PARTITIONS
197 * Select Static partition definitions
199 part_banks[0].mtd_part = tqm8xxl_partitions;
200 part_banks[0].type = "Static image";
201 part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
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);
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);
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;
233 error:
234 iounmap(start_scan_addr);
235 return ret;
238 static void __exit cleanup_tqm_mtd(void)
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]);
247 /* release map_info not used anymore */
248 kfree(map_banks[idx]->name);
249 kfree(map_banks[idx]);
252 if (start_scan_addr) {
253 iounmap(start_scan_addr);
254 start_scan_addr = 0;
258 module_init(init_tqm_mtd);
259 module_exit(cleanup_tqm_mtd);
261 MODULE_LICENSE("GPL");
262 MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
263 MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");