1 // $Id: vmax301.c,v 1.32 2005/11/07 11:14:29 gleixner Exp $
2 /* ######################################################################
4 Tempustech VMAX SBC301 MTD Driver.
6 The VMAx 301 is a SBC based on . It
7 comes with three builtin AMD 29F016B flash chips and a socket for SRAM or
8 more flash. Each unit has it's own 8k mapping into a settable region
9 (0xD8000). There are two 8k mappings for each MTD, the first is always set
10 to the lower 8k of the device the second is paged. Writing a 16 bit page
11 value to anywhere in the first 8k will cause the second 8k to page around.
13 To boot the device a bios extension must be installed into the first 8k
14 of flash that is smart enough to copy itself down, page in the rest of
15 itself and begin executing.
17 ##################################################################### */
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 #include <linux/ioport.h>
22 #include <linux/init.h>
23 #include <linux/spinlock.h>
26 #include <linux/mtd/map.h>
27 #include <linux/mtd/mtd.h>
30 #define WINDOW_START 0xd8000
31 #define WINDOW_LENGTH 0x2000
32 #define WINDOW_SHIFT 25
33 #define WINDOW_MASK 0x1FFF
35 /* Actually we could use two spinlocks, but we'd have to have
36 more private space in the struct map_info. We lose a little
37 performance like this, but we'd probably lose more by having
38 the extra indirection from having one of the map->map_priv
39 fields pointing to yet another private struct.
41 static DEFINE_SPINLOCK(vmax301_spin);
43 static void __vmax301_page(struct map_info *map, unsigned long page)
45 writew(page, map->map_priv_2 - WINDOW_LENGTH);
46 map->map_priv_1 = page;
49 static inline void vmax301_page(struct map_info *map,
52 unsigned long page = (ofs >> WINDOW_SHIFT);
53 if (map->map_priv_1 != page)
54 __vmax301_page(map, page);
57 static map_word vmax301_read8(struct map_info *map, unsigned long ofs)
60 spin_lock(&vmax301_spin);
61 vmax301_page(map, ofs);
62 ret.x[0] = readb(map->map_priv_2 + (ofs & WINDOW_MASK));
63 spin_unlock(&vmax301_spin);
67 static void vmax301_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
70 unsigned long thislen = len;
71 if (len > (WINDOW_LENGTH - (from & WINDOW_MASK)))
72 thislen = WINDOW_LENGTH-(from & WINDOW_MASK);
73 spin_lock(&vmax301_spin);
74 vmax301_page(map, from);
75 memcpy_fromio(to, map->map_priv_2 + from, thislen);
76 spin_unlock(&vmax301_spin);
83 static void vmax301_write8(struct map_info *map, map_word d, unsigned long adr)
85 spin_lock(&vmax301_spin);
86 vmax301_page(map, adr);
87 writeb(d.x[0], map->map_priv_2 + (adr & WINDOW_MASK));
88 spin_unlock(&vmax301_spin);
91 static void vmax301_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
94 unsigned long thislen = len;
95 if (len > (WINDOW_LENGTH - (to & WINDOW_MASK)))
96 thislen = WINDOW_LENGTH-(to & WINDOW_MASK);
98 spin_lock(&vmax301_spin);
99 vmax301_page(map, to);
100 memcpy_toio(map->map_priv_2 + to, from, thislen);
101 spin_unlock(&vmax301_spin);
108 static struct map_info vmax_map[2] = {
110 .name = "VMAX301 Internal Flash",
112 .size = 3*2*1024*1024,
114 .read = vmax301_read8,
115 .copy_from = vmax301_copy_from,
116 .write = vmax301_write8,
117 .copy_to = vmax301_copy_to,
118 .map_priv_1 = WINDOW_START + WINDOW_LENGTH,
119 .map_priv_2 = 0xFFFFFFFF
122 .name = "VMAX301 Socket",
126 .read = vmax301_read8,
127 .copy_from = vmax301_copy_from,
128 .write = vmax301_write8,
129 .copy_to = vmax301_copy_to,
130 .map_priv_1 = WINDOW_START + (3*WINDOW_LENGTH),
131 .map_priv_2 = 0xFFFFFFFF
135 static struct mtd_info *vmax_mtd[2] = {NULL, NULL};
137 static void __exit cleanup_vmax301(void)
141 for (i=0; i<2; i++) {
143 del_mtd_device(vmax_mtd[i]);
144 map_destroy(vmax_mtd[i]);
147 iounmap((void *)vmax_map[0].map_priv_1 - WINDOW_START);
150 int __init init_vmax301(void)
153 unsigned long iomapadr;
154 // Print out our little header..
155 printk("Tempustech VMAX 301 MEM:0x%x-0x%x\n",WINDOW_START,
156 WINDOW_START+4*WINDOW_LENGTH);
158 iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH*4);
160 printk("Failed to ioremap memory region\n");
163 /* Put the address in the map's private data area.
164 We store the actual MTD IO address rather than the
165 address of the first half, because it's used more
168 vmax_map[0].map_priv_2 = iomapadr + WINDOW_START;
169 vmax_map[1].map_priv_2 = iomapadr + (3*WINDOW_START);
171 for (i=0; i<2; i++) {
172 vmax_mtd[i] = do_map_probe("cfi_probe", &vmax_map[i]);
174 vmax_mtd[i] = do_map_probe("jedec", &vmax_map[i]);
176 vmax_mtd[i] = do_map_probe("map_ram", &vmax_map[i]);
178 vmax_mtd[i] = do_map_probe("map_rom", &vmax_map[i]);
180 vmax_mtd[i]->owner = THIS_MODULE;
181 add_mtd_device(vmax_mtd[i]);
185 if (!vmax_mtd[1] && !vmax_mtd[2]) {
186 iounmap((void *)iomapadr);
193 module_init(init_vmax301);
194 module_exit(cleanup_vmax301);
196 MODULE_LICENSE("GPL");
197 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
198 MODULE_DESCRIPTION("MTD map driver for Tempustech VMAX SBC301 board");