1/*
2 * Handle mapping of the flash memory access routines
3 * on TQM8xxL based devices.
4 *
5 * $Id: tqm8xxl.c,v 1.1.1.1 2007/08/03 18:52:44 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
42struct 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;
50static struct mtd_info* mtd_banks[FLASH_BANK_MAX];
51static struct map_info* map_banks[FLASH_BANK_MAX];
52static struct mtd_part_def part_banks[FLASH_BANK_MAX];
53static unsigned long num_banks;
54static 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 */
69static unsigned long tqm8xxl_max_flash_size = 0x00800000;
70
71/* partition definition for first flash bank
72 * (cf. "drivers/char/flash_config.c")
73 */
74static 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 */
99static 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
114int __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] = kzalloc(sizeof(struct map_info), GFP_KERNEL);
138		if(map_banks[idx] == NULL) {
139			ret = -ENOMEM;
140			goto error_mem;
141		}
142
143		map_banks[idx]->name = (char *)kmalloc(16, GFP_KERNEL);
144
145		if (!map_banks[idx]->name) {
146			ret = -ENOMEM;
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
159		if (idx && mtd_banks[idx-1]) {
160			map_banks[idx]->virt += mtd_banks[idx-1]->size;
161			map_banks[idx]->phys += mtd_banks[idx-1]->size;
162		}
163
164		//start to probe flash chips
165		mtd_banks[idx] = do_map_probe("cfi_probe", map_banks[idx]);
166
167		if (mtd_banks[idx]) {
168			mtd_banks[idx]->owner = THIS_MODULE;
169			mtd_size += mtd_banks[idx]->size;
170			num_banks++;
171
172			printk(KERN_INFO "%s: bank%d, name:%s, size:%dbytes \n", __FUNCTION__, num_banks,
173			mtd_banks[idx]->name, mtd_banks[idx]->size);
174		}
175	}
176
177	/* no supported flash chips found */
178	if (!num_banks) {
179		printk(KERN_NOTICE "TQM8xxL: No support flash chips found!\n");
180		ret = -ENXIO;
181		goto error_mem;
182	}
183
184#ifdef CONFIG_MTD_PARTITIONS
185	/*
186	 * Select Static partition definitions
187	 */
188	part_banks[0].mtd_part = tqm8xxl_partitions;
189	part_banks[0].type = "Static image";
190	part_banks[0].nums = ARRAY_SIZE(tqm8xxl_partitions);
191
192	part_banks[1].mtd_part = tqm8xxl_fs_partitions;
193	part_banks[1].type = "Static file system";
194	part_banks[1].nums = ARRAY_SIZE(tqm8xxl_fs_partitions);
195
196	for(idx = 0; idx < num_banks ; idx++) {
197		if (part_banks[idx].nums == 0) {
198			printk(KERN_NOTICE "TQM flash%d: no partition info available, registering whole flash at once\n", idx);
199			add_mtd_device(mtd_banks[idx]);
200		} else {
201			printk(KERN_NOTICE "TQM flash%d: Using %s partition definition\n",
202					idx, part_banks[idx].type);
203			add_mtd_partitions(mtd_banks[idx], part_banks[idx].mtd_part,
204								part_banks[idx].nums);
205		}
206	}
207#else
208	printk(KERN_NOTICE "TQM flash: registering %d whole flash banks at once\n", num_banks);
209	for(idx = 0 ; idx < num_banks ; idx++)
210		add_mtd_device(mtd_banks[idx]);
211#endif
212	return 0;
213error_mem:
214	for(idx = 0 ; idx < FLASH_BANK_MAX ; idx++) {
215		if(map_banks[idx] != NULL) {
216			kfree(map_banks[idx]->name);
217			map_banks[idx]->name = NULL;
218			kfree(map_banks[idx]);
219			map_banks[idx] = NULL;
220		}
221	}
222error:
223	iounmap(start_scan_addr);
224	return ret;
225}
226
227static void __exit cleanup_tqm_mtd(void)
228{
229	unsigned int idx = 0;
230	for(idx = 0 ; idx < num_banks ; idx++) {
231		/* destroy mtd_info previously allocated */
232		if (mtd_banks[idx]) {
233			del_mtd_partitions(mtd_banks[idx]);
234			map_destroy(mtd_banks[idx]);
235		}
236		/* release map_info not used anymore */
237		kfree(map_banks[idx]->name);
238		kfree(map_banks[idx]);
239	}
240
241	if (start_scan_addr) {
242		iounmap(start_scan_addr);
243		start_scan_addr = 0;
244	}
245}
246
247module_init(init_tqm_mtd);
248module_exit(cleanup_tqm_mtd);
249
250MODULE_LICENSE("GPL");
251MODULE_AUTHOR("Kirk Lee <kirk@hpc.ee.ntu.edu.tw>");
252MODULE_DESCRIPTION("MTD map driver for TQM8xxL boards");
253