Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* ###################################################################### |
| 2 | |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 3 | Octagon 5066 MTD Driver. |
| 4 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 8 | into a 32k memory window at 0xe8000. The control register for the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | On each SSD, the first 128k is reserved for use by the bios |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 18 | (actually it IS the bios..) This only matters if you are booting off the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | flash, you must not put a file system starting there. |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | The driver tries to do a detection algorithm to guess what sort of devices |
| 22 | are plugged into the sockets. |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | ##################################################################### */ |
| 25 | |
| 26 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 145 | change pages while monitoring the window. A change in the window, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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]) { |
Jamie Iles | ee0e87b | 2011-05-23 10:23:40 +0100 | [diff] [blame] | 178 | mtd_device_unregister(oct5066_mtd[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | map_destroy(oct5066_mtd[i]); |
| 180 | } |
| 181 | } |
| 182 | iounmap((void *)iomapadr); |
| 183 | release_region(PAGE_IO, 1); |
| 184 | } |
| 185 | |
Dmitri Vorobiev | d849257 | 2008-11-25 02:55:02 +0200 | [diff] [blame] | 186 | static int __init init_oct5066(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Jamie Iles | ee0e87b | 2011-05-23 10:23:40 +0100 | [diff] [blame] | 223 | mtd_device_register(oct5066_mtd[i], NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | } |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | if (!oct5066_mtd[0] && !oct5066_mtd[1]) { |
| 228 | cleanup_oct5066(); |
| 229 | return -ENXIO; |
Thomas Gleixner | 69f34c9 | 2005-11-07 11:15:40 +0000 | [diff] [blame] | 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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"); |