Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | // $Id: octagon-5066.c,v 1.26 2004/07/12 22:38:29 dwmw2 Exp $ |
| 2 | /* ###################################################################### |
| 3 | |
| 4 | Octagon 5066 MTD Driver. |
| 5 | |
| 6 | The Octagon 5066 is a SBC based on AMD's 586-WB running at 133 MHZ. It |
| 7 | comes with a builtin AMD 29F016 flash chip and a socketed EEPROM that |
| 8 | is replacable by flash. Both units are mapped through a multiplexer |
| 9 | into a 32k memory window at 0xe8000. The control register for the |
| 10 | multiplexing unit is located at IO 0x208 with a bit map of |
| 11 | 0-5 Page Selection in 32k increments |
| 12 | 6-7 Device selection: |
| 13 | 00 SSD off |
| 14 | 01 SSD 0 (Socket) |
| 15 | 10 SSD 1 (Flash chip) |
| 16 | 11 undefined |
| 17 | |
| 18 | On each SSD, the first 128k is reserved for use by the bios |
| 19 | (actually it IS the bios..) This only matters if you are booting off the |
| 20 | flash, you must not put a file system starting there. |
| 21 | |
| 22 | The driver tries to do a detection algorithm to guess what sort of devices |
| 23 | are plugged into the sockets. |
| 24 | |
| 25 | ##################################################################### */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/ioport.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <asm/io.h> |
| 32 | |
| 33 | #include <linux/mtd/map.h> |
| 34 | #include <linux/mtd/mtd.h> |
| 35 | |
| 36 | #define WINDOW_START 0xe8000 |
| 37 | #define WINDOW_LENGTH 0x8000 |
| 38 | #define WINDOW_SHIFT 27 |
| 39 | #define WINDOW_MASK 0x7FFF |
| 40 | #define PAGE_IO 0x208 |
| 41 | |
| 42 | static volatile char page_n_dev = 0; |
| 43 | static unsigned long iomapadr; |
| 44 | static DEFINE_SPINLOCK(oct5066_spin); |
| 45 | |
| 46 | /* |
| 47 | * We use map_priv_1 to identify which device we are. |
| 48 | */ |
| 49 | |
| 50 | static void __oct5066_page(struct map_info *map, __u8 byte) |
| 51 | { |
| 52 | outb(byte,PAGE_IO); |
| 53 | page_n_dev = byte; |
| 54 | } |
| 55 | |
| 56 | static inline void oct5066_page(struct map_info *map, unsigned long ofs) |
| 57 | { |
| 58 | __u8 byte = map->map_priv_1 | (ofs >> WINDOW_SHIFT); |
| 59 | |
| 60 | if (page_n_dev != byte) |
| 61 | __oct5066_page(map, byte); |
| 62 | } |
| 63 | |
| 64 | |
| 65 | static map_word oct5066_read8(struct map_info *map, unsigned long ofs) |
| 66 | { |
| 67 | map_word ret; |
| 68 | spin_lock(&oct5066_spin); |
| 69 | oct5066_page(map, ofs); |
| 70 | ret.x[0] = readb(iomapadr + (ofs & WINDOW_MASK)); |
| 71 | spin_unlock(&oct5066_spin); |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | static void oct5066_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) |
| 76 | { |
| 77 | while(len) { |
| 78 | unsigned long thislen = len; |
| 79 | if (len > (WINDOW_LENGTH - (from & WINDOW_MASK))) |
| 80 | thislen = WINDOW_LENGTH-(from & WINDOW_MASK); |
| 81 | |
| 82 | spin_lock(&oct5066_spin); |
| 83 | oct5066_page(map, from); |
| 84 | memcpy_fromio(to, iomapadr + from, thislen); |
| 85 | spin_unlock(&oct5066_spin); |
| 86 | to += thislen; |
| 87 | from += thislen; |
| 88 | len -= thislen; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static void oct5066_write8(struct map_info *map, map_word d, unsigned long adr) |
| 93 | { |
| 94 | spin_lock(&oct5066_spin); |
| 95 | oct5066_page(map, adr); |
| 96 | writeb(d.x[0], iomapadr + (adr & WINDOW_MASK)); |
| 97 | spin_unlock(&oct5066_spin); |
| 98 | } |
| 99 | |
| 100 | static void oct5066_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len) |
| 101 | { |
| 102 | while(len) { |
| 103 | unsigned long thislen = len; |
| 104 | if (len > (WINDOW_LENGTH - (to & WINDOW_MASK))) |
| 105 | thislen = WINDOW_LENGTH-(to & WINDOW_MASK); |
| 106 | |
| 107 | spin_lock(&oct5066_spin); |
| 108 | oct5066_page(map, to); |
| 109 | memcpy_toio(iomapadr + to, from, thislen); |
| 110 | spin_unlock(&oct5066_spin); |
| 111 | to += thislen; |
| 112 | from += thislen; |
| 113 | len -= thislen; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | static struct map_info oct5066_map[2] = { |
| 118 | { |
| 119 | .name = "Octagon 5066 Socket", |
| 120 | .phys = NO_XIP, |
| 121 | .size = 512 * 1024, |
| 122 | .bankwidth = 1, |
| 123 | .read = oct5066_read8, |
| 124 | .copy_from = oct5066_copy_from, |
| 125 | .write = oct5066_write8, |
| 126 | .copy_to = oct5066_copy_to, |
| 127 | .map_priv_1 = 1<<6 |
| 128 | }, |
| 129 | { |
| 130 | .name = "Octagon 5066 Internal Flash", |
| 131 | .phys = NO_XIP, |
| 132 | .size = 2 * 1024 * 1024, |
| 133 | .bankwidth = 1, |
| 134 | .read = oct5066_read8, |
| 135 | .copy_from = oct5066_copy_from, |
| 136 | .write = oct5066_write8, |
| 137 | .copy_to = oct5066_copy_to, |
| 138 | .map_priv_1 = 2<<6 |
| 139 | } |
| 140 | }; |
| 141 | |
| 142 | static struct mtd_info *oct5066_mtd[2] = {NULL, NULL}; |
| 143 | |
| 144 | // OctProbe - Sense if this is an octagon card |
| 145 | // --------------------------------------------------------------------- |
| 146 | /* Perform a simple validity test, we map the window select SSD0 and |
| 147 | change pages while monitoring the window. A change in the window, |
| 148 | controlled by the PAGE_IO port is a functioning 5066 board. This will |
| 149 | fail if the thing in the socket is set to a uniform value. */ |
| 150 | static int __init OctProbe(void) |
| 151 | { |
| 152 | unsigned int Base = (1 << 6); |
| 153 | unsigned long I; |
| 154 | unsigned long Values[10]; |
| 155 | for (I = 0; I != 20; I++) |
| 156 | { |
| 157 | outb(Base + (I%10),PAGE_IO); |
| 158 | if (I < 10) |
| 159 | { |
| 160 | // Record the value and check for uniqueness |
| 161 | Values[I%10] = readl(iomapadr); |
| 162 | if (I > 0 && Values[I%10] == Values[0]) |
| 163 | return -EAGAIN; |
| 164 | } |
| 165 | else |
| 166 | { |
| 167 | // Make sure we get the same values on the second pass |
| 168 | if (Values[I%10] != readl(iomapadr)) |
| 169 | return -EAGAIN; |
| 170 | } |
| 171 | } |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | void cleanup_oct5066(void) |
| 176 | { |
| 177 | int i; |
| 178 | for (i=0; i<2; i++) { |
| 179 | if (oct5066_mtd[i]) { |
| 180 | del_mtd_device(oct5066_mtd[i]); |
| 181 | map_destroy(oct5066_mtd[i]); |
| 182 | } |
| 183 | } |
| 184 | iounmap((void *)iomapadr); |
| 185 | release_region(PAGE_IO, 1); |
| 186 | } |
| 187 | |
| 188 | int __init init_oct5066(void) |
| 189 | { |
| 190 | int i; |
| 191 | int ret = 0; |
| 192 | |
| 193 | // Do an autoprobe sequence |
| 194 | if (!request_region(PAGE_IO,1,"Octagon SSD")) { |
| 195 | printk(KERN_NOTICE "5066: Page Register in Use\n"); |
| 196 | return -EAGAIN; |
| 197 | } |
| 198 | iomapadr = (unsigned long)ioremap(WINDOW_START, WINDOW_LENGTH); |
| 199 | if (!iomapadr) { |
| 200 | printk(KERN_NOTICE "Failed to ioremap memory region\n"); |
| 201 | ret = -EIO; |
| 202 | goto out_rel; |
| 203 | } |
| 204 | if (OctProbe() != 0) { |
| 205 | printk(KERN_NOTICE "5066: Octagon Probe Failed, is this an Octagon 5066 SBC?\n"); |
| 206 | iounmap((void *)iomapadr); |
| 207 | ret = -EAGAIN; |
| 208 | goto out_unmap; |
| 209 | } |
| 210 | |
| 211 | // Print out our little header.. |
| 212 | printk("Octagon 5066 SSD IO:0x%x MEM:0x%x-0x%x\n",PAGE_IO,WINDOW_START, |
| 213 | WINDOW_START+WINDOW_LENGTH); |
| 214 | |
| 215 | for (i=0; i<2; i++) { |
| 216 | oct5066_mtd[i] = do_map_probe("cfi_probe", &oct5066_map[i]); |
| 217 | if (!oct5066_mtd[i]) |
| 218 | oct5066_mtd[i] = do_map_probe("jedec", &oct5066_map[i]); |
| 219 | if (!oct5066_mtd[i]) |
| 220 | oct5066_mtd[i] = do_map_probe("map_ram", &oct5066_map[i]); |
| 221 | if (!oct5066_mtd[i]) |
| 222 | oct5066_mtd[i] = do_map_probe("map_rom", &oct5066_map[i]); |
| 223 | if (oct5066_mtd[i]) { |
| 224 | oct5066_mtd[i]->owner = THIS_MODULE; |
| 225 | add_mtd_device(oct5066_mtd[i]); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | if (!oct5066_mtd[0] && !oct5066_mtd[1]) { |
| 230 | cleanup_oct5066(); |
| 231 | return -ENXIO; |
| 232 | } |
| 233 | |
| 234 | return 0; |
| 235 | |
| 236 | out_unmap: |
| 237 | iounmap((void *)iomapadr); |
| 238 | out_rel: |
| 239 | release_region(PAGE_IO, 1); |
| 240 | return ret; |
| 241 | } |
| 242 | |
| 243 | module_init(init_oct5066); |
| 244 | module_exit(cleanup_oct5066); |
| 245 | |
| 246 | MODULE_LICENSE("GPL"); |
| 247 | MODULE_AUTHOR("Jason Gunthorpe <jgg@deltatee.com>, David Woodhouse <dwmw2@infradead.org>"); |
| 248 | MODULE_DESCRIPTION("MTD map driver for Octagon 5066 Single Board Computer"); |