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Commit | Line | Data |
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1da177e4 LT |
1 | /* ###################################################################### |
2 | ||
69f34c98 TG |
3 | Octagon 5066 MTD Driver. |
4 | ||
1da177e4 LT |
5 | The Octagon 5066 is a SBC based on AMD's 586-WB running at 133 MHZ. It |
6 | comes with a builtin AMD 29F016 flash chip and a socketed EEPROM that | |
7 | is replacable by flash. Both units are mapped through a multiplexer | |
69f34c98 | 8 | into a 32k memory window at 0xe8000. The control register for the |
1da177e4 LT |
9 | multiplexing unit is located at IO 0x208 with a bit map of |
10 | 0-5 Page Selection in 32k increments | |
11 | 6-7 Device selection: | |
12 | 00 SSD off | |
13 | 01 SSD 0 (Socket) | |
14 | 10 SSD 1 (Flash chip) | |
15 | 11 undefined | |
69f34c98 | 16 | |
1da177e4 | 17 | On each SSD, the first 128k is reserved for use by the bios |
69f34c98 | 18 | (actually it IS the bios..) This only matters if you are booting off the |
1da177e4 | 19 | flash, you must not put a file system starting there. |
69f34c98 | 20 | |
1da177e4 LT |
21 | The driver tries to do a detection algorithm to guess what sort of devices |
22 | are plugged into the sockets. | |
69f34c98 | 23 | |
1da177e4 LT |
24 | ##################################################################### */ |
25 | ||
26 | #include <linux/module.h> | |
1da177e4 LT |
27 | #include <linux/ioport.h> |
28 | #include <linux/init.h> | |
29 | #include <asm/io.h> | |
30 | ||
31 | #include <linux/mtd/map.h> | |
32 | #include <linux/mtd/mtd.h> | |
33 | ||
34 | #define WINDOW_START 0xe8000 | |
35 | #define WINDOW_LENGTH 0x8000 | |
36 | #define WINDOW_SHIFT 27 | |
37 | #define WINDOW_MASK 0x7FFF | |
38 | #define PAGE_IO 0x208 | |
39 | ||
40 | static volatile char page_n_dev = 0; | |
41 | static unsigned long iomapadr; | |
42 | static DEFINE_SPINLOCK(oct5066_spin); | |
43 | ||
44 | /* | |
45 | * We use map_priv_1 to identify which device we are. | |
46 | */ | |
47 | ||
48 | static void __oct5066_page(struct map_info *map, __u8 byte) | |
49 | { | |
50 | outb(byte,PAGE_IO); | |
51 | page_n_dev = byte; | |
52 | } | |
53 | ||
54 | static inline void oct5066_page(struct map_info *map, unsigned long ofs) | |
55 | { | |
56 | __u8 byte = map->map_priv_1 | (ofs >> WINDOW_SHIFT); | |
69f34c98 | 57 | |
1da177e4 LT |
58 | if (page_n_dev != byte) |
59 | __oct5066_page(map, byte); | |
60 | } | |
61 | ||
62 | ||
63 | static map_word oct5066_read8(struct map_info *map, unsigned long ofs) | |
64 | { | |
65 | map_word ret; | |
66 | spin_lock(&oct5066_spin); | |
67 | oct5066_page(map, ofs); | |
68 | ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); | |
69 | spin_unlock(&oct5066_spin); | |
70 | return ret; | |
71 | } | |
72 | ||
73 | static void oct5066_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) | |
74 | { | |
75 | while(len) { | |
76 | unsigned long thislen = len; | |
77 | if (len > (WINDOW_LENGTH - (from & WINDOW_MASK))) | |
78 | thislen = WINDOW_LENGTH-(from & WINDOW_MASK); | |
69f34c98 | 79 | |
1da177e4 LT |
80 | spin_lock(&oct5066_spin); |
81 | oct5066_page(map, from); | |
82 | memcpy_fromio(to, iomapadr + from, thislen); | |
83 | spin_unlock(&oct5066_spin); | |
84 | to += thislen; | |
85 | from += thislen; | |
86 | len -= thislen; | |
87 | } | |
88 | } | |
89 | ||
90 | static void oct5066_write8(struct map_info *map, map_word d, unsigned long adr) | |
91 | { | |
92 | spin_lock(&oct5066_spin); | |
93 | oct5066_page(map, adr); | |
94 | writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); | |
95 | spin_unlock(&oct5066_spin); | |
96 | } | |
97 | ||
98 | static void oct5066_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) | |
99 | { | |
100 | while(len) { | |
101 | unsigned long thislen = len; | |
102 | if (len > (WINDOW_LENGTH - (to & WINDOW_MASK))) | |
103 | thislen = WINDOW_LENGTH-(to & WINDOW_MASK); | |
69f34c98 | 104 | |
1da177e4 LT |
105 | spin_lock(&oct5066_spin); |
106 | oct5066_page(map, to); | |
107 | memcpy_toio(iomapadr + to, from, thislen); | |
108 | spin_unlock(&oct5066_spin); | |
109 | to += thislen; | |
110 | from += thislen; | |
111 | len -= thislen; | |
112 | } | |
113 | } | |
114 | ||
115 | static struct map_info oct5066_map[2] = { | |
116 | { | |
117 | .name = "Octagon 5066 Socket", | |
118 | .phys = NO_XIP, | |
119 | .size = 512 * 1024, | |
120 | .bankwidth = 1, | |
121 | .read = oct5066_read8, | |
122 | .copy_from = oct5066_copy_from, | |
123 | .write = oct5066_write8, | |
124 | .copy_to = oct5066_copy_to, | |
125 | .map_priv_1 = 1<<6 | |
126 | }, | |
127 | { | |
128 | .name = "Octagon 5066 Internal Flash", | |
129 | .phys = NO_XIP, | |
130 | .size = 2 * 1024 * 1024, | |
131 | .bankwidth = 1, | |
132 | .read = oct5066_read8, | |
133 | .copy_from = oct5066_copy_from, | |
134 | .write = oct5066_write8, | |
135 | .copy_to = oct5066_copy_to, | |
136 | .map_priv_1 = 2<<6 | |
137 | } | |
138 | }; | |
139 | ||
140 | static struct mtd_info *oct5066_mtd[2] = {NULL, NULL}; | |
141 | ||
142 | // OctProbe - Sense if this is an octagon card | |
143 | // --------------------------------------------------------------------- | |
144 | /* Perform a simple validity test, we map the window select SSD0 and | |
69f34c98 | 145 | change pages while monitoring the window. A change in the window, |
1da177e4 LT |
146 | controlled by the PAGE_IO port is a functioning 5066 board. This will |
147 | fail if the thing in the socket is set to a uniform value. */ | |
148 | static int __init OctProbe(void) | |
149 | { | |
150 | unsigned int Base = (1 << 6); | |
151 | unsigned long I; | |
152 | unsigned long Values[10]; | |
153 | for (I = 0; I != 20; I++) | |
154 | { | |
155 | outb(Base + (I%10),PAGE_IO); | |
156 | if (I < 10) | |
157 | { | |
158 | // Record the value and check for uniqueness | |
159 | Values[I%10] = readl(iomapadr); | |
160 | if (I > 0 && Values[I%10] == Values[0]) | |
161 | return -EAGAIN; | |
69f34c98 | 162 | } |
1da177e4 LT |
163 | else |
164 | { | |
165 | // Make sure we get the same values on the second pass | |
166 | if (Values[I%10] != readl(iomapadr)) | |
167 | return -EAGAIN; | |
69f34c98 | 168 | } |
1da177e4 LT |
169 | } |
170 | return 0; | |
171 | } | |
172 | ||
173 | void cleanup_oct5066(void) | |
174 | { | |
175 | int i; | |
176 | for (i=0; i<2; i++) { | |
177 | if (oct5066_mtd[i]) { | |
ee0e87b1 | 178 | mtd_device_unregister(oct5066_mtd[i]); |
1da177e4 LT |
179 | map_destroy(oct5066_mtd[i]); |
180 | } | |
181 | } | |
182 | iounmap((void *)iomapadr); | |
183 | release_region(PAGE_IO, 1); | |
184 | } | |
185 | ||
d849257c | 186 | static int __init init_oct5066(void) |
1da177e4 LT |
187 | { |
188 | int i; | |
189 | int ret = 0; | |
190 | ||
191 | // Do an autoprobe sequence | |
192 | if (!request_region(PAGE_IO,1,"Octagon SSD")) { | |
193 | printk(KERN_NOTICE "5066: Page Register in Use\n"); | |
194 | return -EAGAIN; | |
195 | } | |
196 | iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH); | |
197 | if (!iomapadr) { | |
198 | printk(KERN_NOTICE "Failed to ioremap memory region\n"); | |
199 | ret = -EIO; | |
200 | goto out_rel; | |
201 | } | |
202 | if (OctProbe() != 0) { | |
203 | printk(KERN_NOTICE "5066: Octagon Probe Failed, is this an Octagon 5066 SBC?\n"); | |
204 | iounmap((void *)iomapadr); | |
205 | ret = -EAGAIN; | |
206 | goto out_unmap; | |
207 | } | |
69f34c98 | 208 | |
1da177e4 LT |
209 | // Print out our little header.. |
210 | printk("Octagon 5066 SSD IO:0x%x MEM:0x%x-0x%x\n",PAGE_IO,WINDOW_START, | |
211 | WINDOW_START+WINDOW_LENGTH); | |
69f34c98 | 212 | |
1da177e4 LT |
213 | for (i=0; i<2; i++) { |
214 | oct5066_mtd[i] = do_map_probe("cfi_probe", &oct5066_map[i]); | |
215 | if (!oct5066_mtd[i]) | |
216 | oct5066_mtd[i] = do_map_probe("jedec", &oct5066_map[i]); | |
217 | if (!oct5066_mtd[i]) | |
218 | oct5066_mtd[i] = do_map_probe("map_ram", &oct5066_map[i]); | |
219 | if (!oct5066_mtd[i]) | |
220 | oct5066_mtd[i] = do_map_probe("map_rom", &oct5066_map[i]); | |
221 | if (oct5066_mtd[i]) { | |
222 | oct5066_mtd[i]->owner = THIS_MODULE; | |
ee0e87b1 | 223 | mtd_device_register(oct5066_mtd[i], NULL, 0); |
1da177e4 LT |
224 | } |
225 | } | |
69f34c98 | 226 | |
1da177e4 LT |
227 | if (!oct5066_mtd[0] && !oct5066_mtd[1]) { |
228 | cleanup_oct5066(); | |
229 | return -ENXIO; | |
69f34c98 | 230 | } |
1da177e4 LT |
231 | |
232 | return 0; | |
233 | ||
234 | out_unmap: | |
235 | iounmap((void *)iomapadr); | |
236 | out_rel: | |
237 | release_region(PAGE_IO, 1); | |
238 | return ret; | |
239 | } | |
240 | ||
241 | module_init(init_oct5066); | |
242 | module_exit(cleanup_oct5066); | |
243 | ||
244 | MODULE_LICENSE("GPL"); | |
245 | MODULE_AUTHOR("Jason Gunthorpe <jgg@deltatee.com>, David Woodhouse <dwmw2@infradead.org>"); | |
246 | MODULE_DESCRIPTION("MTD map driver for Octagon 5066 Single Board Computer"); |