diff options
Diffstat (limited to 'drivers/nubus/nubus.c')
| -rw-r--r-- | drivers/nubus/nubus.c | 1042 |
1 files changed, 1042 insertions, 0 deletions
diff --git a/drivers/nubus/nubus.c b/drivers/nubus/nubus.c new file mode 100644 index 0000000..14cbe34 --- /dev/null +++ b/drivers/nubus/nubus.c @@ -0,0 +1,1042 @@ +/* + * Macintosh Nubus Interface Code + * + * Originally by Alan Cox + * + * Mostly rewritten by David Huggins-Daines, C. Scott Ananian, + * and others. + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/nubus.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <asm/setup.h> +#include <asm/system.h> +#include <asm/page.h> +#include <asm/hwtest.h> +#include <linux/proc_fs.h> +#include <asm/mac_via.h> +#include <asm/mac_oss.h> + +extern void via_nubus_init(void); +extern void oss_nubus_init(void); + +/* Constants */ + +/* This is, of course, the size in bytelanes, rather than the size in + actual bytes */ +#define FORMAT_BLOCK_SIZE 20 +#define ROM_DIR_OFFSET 0x24 + +#define NUBUS_TEST_PATTERN 0x5A932BC7 + +/* Define this if you like to live dangerously - it is known not to + work on pretty much every machine except the Quadra 630 and the LC + III. */ +#undef I_WANT_TO_PROBE_SLOT_ZERO + +/* This sometimes helps combat failure to boot */ +#undef TRY_TO_DODGE_WSOD + +/* Globals */ + +struct nubus_dev* nubus_devices; +struct nubus_board* nubus_boards; + +/* Meaning of "bytelanes": + + The card ROM may appear on any or all bytes of each long word in + NuBus memory. The low 4 bits of the "map" value found in the + format block (at the top of the slot address space, as well as at + the top of the MacOS ROM) tells us which bytelanes, i.e. which byte + offsets within each longword, are valid. Thus: + + A map of 0x0f, as found in the MacOS ROM, means that all bytelanes + are valid. + + A map of 0xf0 means that no bytelanes are valid (We pray that we + will never encounter this, but stranger things have happened) + + A map of 0xe1 means that only the MSB of each long word is actually + part of the card ROM. (We hope to never encounter NuBus on a + little-endian machine. Again, stranger things have happened) + + A map of 0x78 means that only the LSB of each long word is valid. + + Etcetera, etcetera. Hopefully this clears up some confusion over + what the following code actually does. */ + +static inline int not_useful(void *p, int map) +{ + unsigned long pv=(unsigned long)p; + pv &= 3; + if(map & (1<<pv)) + return 0; + return 1; +} + +static unsigned long nubus_get_rom(unsigned char **ptr, int len, int map) +{ + /* This will hold the result */ + unsigned long v = 0; + unsigned char *p = *ptr; + + while(len) + { + v <<= 8; + while(not_useful(p,map)) + p++; + v |= *p++; + len--; + } + *ptr = p; + return v; +} + +static void nubus_rewind(unsigned char **ptr, int len, int map) +{ + unsigned char *p=*ptr; + + /* Sanity check */ + if(len > 65536) + printk(KERN_ERR "rewind of 0x%08x!\n", len); + while(len) + { + do + { + p--; + } + while(not_useful(p, map)); + len--; + } + *ptr=p; +} + +static void nubus_advance(unsigned char **ptr, int len, int map) +{ + unsigned char *p = *ptr; + if(len>65536) + printk(KERN_ERR "advance of 0x%08x!\n", len); + while(len) + { + while(not_useful(p,map)) + p++; + p++; + len--; + } + *ptr = p; +} + +static void nubus_move(unsigned char **ptr, int len, int map) +{ + if(len > 0) + nubus_advance(ptr, len, map); + else if(len < 0) + nubus_rewind(ptr, -len, map); +} + +/* Now, functions to read the sResource tree */ + +/* Each sResource entry consists of a 1-byte ID and a 3-byte data + field. If that data field contains an offset, then obviously we + have to expand it from a 24-bit signed number to a 32-bit signed + number. */ + +static inline long nubus_expand32(long foo) +{ + if(foo & 0x00800000) /* 24bit negative */ + foo |= 0xFF000000; + return foo; +} + +static inline void *nubus_rom_addr(int slot) +{ + /* + * Returns the first byte after the card. We then walk + * backwards to get the lane register and the config + */ + return (void *)(0xF1000000+(slot<<24)); +} + +static unsigned char *nubus_dirptr(const struct nubus_dirent *nd) +{ + unsigned char *p = nd->base; + /* Essentially, just step over the bytelanes using whatever + offset we might have found */ + nubus_move(&p, nubus_expand32(nd->data), nd->mask); + /* And return the value */ + return p; +} + +/* These two are for pulling resource data blocks (i.e. stuff that's + pointed to with offsets) out of the card ROM. */ + +void nubus_get_rsrc_mem(void *dest, const struct nubus_dirent* dirent, + int len) +{ + unsigned char *t = (unsigned char *)dest; + unsigned char *p = nubus_dirptr(dirent); + while(len) + { + *t++ = nubus_get_rom(&p, 1, dirent->mask); + len--; + } +} + +void nubus_get_rsrc_str(void *dest, const struct nubus_dirent* dirent, + int len) +{ + unsigned char *t=(unsigned char *)dest; + unsigned char *p = nubus_dirptr(dirent); + while(len) + { + *t = nubus_get_rom(&p, 1, dirent->mask); + if(!*t++) + break; + len--; + } +} + +int nubus_get_root_dir(const struct nubus_board* board, + struct nubus_dir* dir) +{ + dir->ptr = dir->base = board->directory; + dir->done = 0; + dir->mask = board->lanes; + return 0; +} + +/* This is a slyly renamed version of the above */ +int nubus_get_func_dir(const struct nubus_dev* dev, + struct nubus_dir* dir) +{ + dir->ptr = dir->base = dev->directory; + dir->done = 0; + dir->mask = dev->board->lanes; + return 0; +} + +int nubus_get_board_dir(const struct nubus_board* board, + struct nubus_dir* dir) +{ + struct nubus_dirent ent; + + dir->ptr = dir->base = board->directory; + dir->done = 0; + dir->mask = board->lanes; + + /* Now dereference it (the first directory is always the board + directory) */ + if (nubus_readdir(dir, &ent) == -1) + return -1; + if (nubus_get_subdir(&ent, dir) == -1) + return -1; + return 0; +} + +int nubus_get_subdir(const struct nubus_dirent *ent, + struct nubus_dir *dir) +{ + dir->ptr = dir->base = nubus_dirptr(ent); + dir->done = 0; + dir->mask = ent->mask; + return 0; +} + +int nubus_readdir(struct nubus_dir *nd, struct nubus_dirent *ent) +{ + u32 resid; + if (nd->done) + return -1; + + /* Do this first, otherwise nubus_rewind & co are off by 4 */ + ent->base = nd->ptr; + + /* This moves nd->ptr forward */ + resid = nubus_get_rom(&nd->ptr, 4, nd->mask); + + /* EOL marker, as per the Apple docs */ + if((resid&0xff000000) == 0xff000000) + { + /* Mark it as done */ + nd->done = 1; + return -1; + } + + /* First byte is the resource ID */ + ent->type = resid >> 24; + /* Low 3 bytes might contain data (or might not) */ + ent->data = resid & 0xffffff; + ent->mask = nd->mask; + return 0; +} + +int nubus_rewinddir(struct nubus_dir* dir) +{ + dir->ptr = dir->base; + return 0; +} + +/* Driver interface functions, more or less like in pci.c */ + +struct nubus_dev* +nubus_find_device(unsigned short category, + unsigned short type, + unsigned short dr_hw, + unsigned short dr_sw, + const struct nubus_dev* from) +{ + struct nubus_dev* itor = + from ? from->next : nubus_devices; + + while (itor) { + if (itor->category == category + && itor->type == type + && itor->dr_hw == dr_hw + && itor->dr_sw == dr_sw) + return itor; + itor = itor->next; + } + return NULL; +} + +struct nubus_dev* +nubus_find_type(unsigned short category, + unsigned short type, + const struct nubus_dev* from) +{ + struct nubus_dev* itor = + from ? from->next : nubus_devices; + + while (itor) { + if (itor->category == category + && itor->type == type) + return itor; + itor = itor->next; + } + return NULL; +} + +struct nubus_dev* +nubus_find_slot(unsigned int slot, + const struct nubus_dev* from) +{ + struct nubus_dev* itor = + from ? from->next : nubus_devices; + + while (itor) { + if (itor->board->slot == slot) + return itor; + itor = itor->next; + } + return NULL; +} + +int +nubus_find_rsrc(struct nubus_dir* dir, unsigned char rsrc_type, + struct nubus_dirent* ent) +{ + while (nubus_readdir(dir, ent) != -1) { + if (ent->type == rsrc_type) + return 0; + } + return -1; +} + +/* Initialization functions - decide which slots contain stuff worth + looking at, and print out lots and lots of information from the + resource blocks. */ + +/* FIXME: A lot of this stuff will eventually be useful after + initializaton, for intelligently probing Ethernet and video chips, + among other things. The rest of it should go in the /proc code. + For now, we just use it to give verbose boot logs. */ + +static int __init nubus_show_display_resource(struct nubus_dev* dev, + const struct nubus_dirent* ent) +{ + switch (ent->type) { + case NUBUS_RESID_GAMMADIR: + printk(KERN_INFO " gamma directory offset: 0x%06x\n", ent->data); + break; + case 0x0080 ... 0x0085: + printk(KERN_INFO " mode %02X info offset: 0x%06x\n", + ent->type, ent->data); + break; + default: + printk(KERN_INFO " unknown resource %02X, data 0x%06x\n", + ent->type, ent->data); + } + return 0; +} + +static int __init nubus_show_network_resource(struct nubus_dev* dev, + const struct nubus_dirent* ent) +{ + switch (ent->type) { + case NUBUS_RESID_MAC_ADDRESS: + { + char addr[6]; + int i; + + nubus_get_rsrc_mem(addr, ent, 6); + printk(KERN_INFO " MAC address: "); + for (i = 0; i < 6; i++) + printk("%02x%s", addr[i] & 0xff, + i == 5 ? "" : ":"); + printk("\n"); + break; + } + default: + printk(KERN_INFO " unknown resource %02X, data 0x%06x\n", + ent->type, ent->data); + } + return 0; +} + +static int __init nubus_show_cpu_resource(struct nubus_dev* dev, + const struct nubus_dirent* ent) +{ + switch (ent->type) { + case NUBUS_RESID_MEMINFO: + { + unsigned long meminfo[2]; + nubus_get_rsrc_mem(&meminfo, ent, 8); + printk(KERN_INFO " memory: [ 0x%08lx 0x%08lx ]\n", + meminfo[0], meminfo[1]); + break; + } + case NUBUS_RESID_ROMINFO: + { + unsigned long rominfo[2]; + nubus_get_rsrc_mem(&rominfo, ent, 8); + printk(KERN_INFO " ROM: [ 0x%08lx 0x%08lx ]\n", + rominfo[0], rominfo[1]); + break; + } + default: + printk(KERN_INFO " unknown resource %02X, data 0x%06x\n", + ent->type, ent->data); + } + return 0; +} + +static int __init nubus_show_private_resource(struct nubus_dev* dev, + const struct nubus_dirent* ent) +{ + switch (dev->category) { + case NUBUS_CAT_DISPLAY: + nubus_show_display_resource(dev, ent); + break; + case NUBUS_CAT_NETWORK: + nubus_show_network_resource(dev, ent); + break; + case NUBUS_CAT_CPU: + nubus_show_cpu_resource(dev, ent); + break; + default: + printk(KERN_INFO " unknown resource %02X, data 0x%06x\n", + ent->type, ent->data); + } + return 0; +} + +static struct nubus_dev* __init + nubus_get_functional_resource(struct nubus_board* board, + int slot, + const struct nubus_dirent* parent) +{ + struct nubus_dir dir; + struct nubus_dirent ent; + struct nubus_dev* dev; + + printk(KERN_INFO " Function 0x%02x:\n", parent->type); + nubus_get_subdir(parent, &dir); + + /* Apple seems to have botched the ROM on the IIx */ + if (slot == 0 && (unsigned long)dir.base % 2) + dir.base += 1; + + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_functional_resource: parent is 0x%p, dir is 0x%p\n", + parent->base, dir.base); + + /* Actually we should probably panic if this fails */ + if ((dev = kmalloc(sizeof(*dev), GFP_ATOMIC)) == NULL) + return NULL; + memset(dev, 0, sizeof(*dev)); + dev->resid = parent->type; + dev->directory = dir.base; + dev->board = board; + + while (nubus_readdir(&dir, &ent) != -1) + { + switch(ent.type) + { + case NUBUS_RESID_TYPE: + { + unsigned short nbtdata[4]; + nubus_get_rsrc_mem(nbtdata, &ent, 8); + dev->category = nbtdata[0]; + dev->type = nbtdata[1]; + dev->dr_sw = nbtdata[2]; + dev->dr_hw = nbtdata[3]; + printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n", + nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]); + break; + } + case NUBUS_RESID_NAME: + { + nubus_get_rsrc_str(dev->name, &ent, 64); + printk(KERN_INFO " name: %s\n", dev->name); + break; + } + case NUBUS_RESID_DRVRDIR: + { + /* MacOS driver. If we were NetBSD we might + use this :-) */ + struct nubus_dir drvr_dir; + struct nubus_dirent drvr_ent; + nubus_get_subdir(&ent, &drvr_dir); + nubus_readdir(&drvr_dir, &drvr_ent); + dev->driver = nubus_dirptr(&drvr_ent); + printk(KERN_INFO " driver at: 0x%p\n", + dev->driver); + break; + } + case NUBUS_RESID_MINOR_BASEOS: + /* We will need this in order to support + multiple framebuffers. It might be handy + for Ethernet as well */ + nubus_get_rsrc_mem(&dev->iobase, &ent, 4); + printk(KERN_INFO " memory offset: 0x%08lx\n", + dev->iobase); + break; + case NUBUS_RESID_MINOR_LENGTH: + /* Ditto */ + nubus_get_rsrc_mem(&dev->iosize, &ent, 4); + printk(KERN_INFO " memory length: 0x%08lx\n", + dev->iosize); + break; + case NUBUS_RESID_FLAGS: + dev->flags = ent.data; + printk(KERN_INFO " flags: 0x%06x\n", dev->flags); + break; + case NUBUS_RESID_HWDEVID: + dev->hwdevid = ent.data; + printk(KERN_INFO " hwdevid: 0x%06x\n", dev->hwdevid); + break; + default: + /* Local/Private resources have their own + function */ + nubus_show_private_resource(dev, &ent); + } + } + + return dev; +} + +/* This is cool. */ +static int __init nubus_get_vidnames(struct nubus_board* board, + const struct nubus_dirent* parent) +{ + struct nubus_dir dir; + struct nubus_dirent ent; + /* FIXME: obviously we want to put this in a header file soon */ + struct vidmode { + u32 size; + /* Don't know what this is yet */ + u16 id; + /* Longest one I've seen so far is 26 characters */ + char name[32]; + }; + + printk(KERN_INFO " video modes supported:\n"); + nubus_get_subdir(parent, &dir); + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_vidnames: parent is 0x%p, dir is 0x%p\n", + parent->base, dir.base); + + while(nubus_readdir(&dir, &ent) != -1) + { + struct vidmode mode; + u32 size; + + /* First get the length */ + nubus_get_rsrc_mem(&size, &ent, 4); + + /* Now clobber the whole thing */ + if (size > sizeof(mode) - 1) + size = sizeof(mode) - 1; + memset(&mode, 0, sizeof(mode)); + nubus_get_rsrc_mem(&mode, &ent, size); + printk (KERN_INFO " %02X: (%02X) %s\n", ent.type, + mode.id, mode.name); + } + return 0; +} + +/* This is *really* cool. */ +static int __init nubus_get_icon(struct nubus_board* board, + const struct nubus_dirent* ent) +{ + /* Should be 32x32 if my memory serves me correctly */ + unsigned char icon[128]; + int x, y; + + nubus_get_rsrc_mem(&icon, ent, 128); + printk(KERN_INFO " icon:\n"); + + /* We should actually plot these somewhere in the framebuffer + init. This is just to demonstrate that they do, in fact, + exist */ + for (y = 0; y < 32; y++) { + printk(KERN_INFO " "); + for (x = 0; x < 32; x++) { + if (icon[y*4 + x/8] + & (0x80 >> (x%8))) + printk("*"); + else + printk(" "); + } + printk("\n"); + } + return 0; +} + +static int __init nubus_get_vendorinfo(struct nubus_board* board, + const struct nubus_dirent* parent) +{ + struct nubus_dir dir; + struct nubus_dirent ent; + static char* vendor_fields[6] = {"ID", "serial", "revision", + "part", "date", "unknown field"}; + + printk(KERN_INFO " vendor info:\n"); + nubus_get_subdir(parent, &dir); + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_vendorinfo: parent is 0x%p, dir is 0x%p\n", + parent->base, dir.base); + + while(nubus_readdir(&dir, &ent) != -1) + { + char name[64]; + + /* These are all strings, we think */ + nubus_get_rsrc_str(name, &ent, 64); + if (ent.type > 5) + ent.type = 5; + printk(KERN_INFO " %s: %s\n", + vendor_fields[ent.type-1], name); + } + return 0; +} + +static int __init nubus_get_board_resource(struct nubus_board* board, int slot, + const struct nubus_dirent* parent) +{ + struct nubus_dir dir; + struct nubus_dirent ent; + + nubus_get_subdir(parent, &dir); + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_board_resource: parent is 0x%p, dir is 0x%p\n", + parent->base, dir.base); + + while(nubus_readdir(&dir, &ent) != -1) + { + switch (ent.type) { + case NUBUS_RESID_TYPE: + { + unsigned short nbtdata[4]; + /* This type is always the same, and is not + useful except insofar as it tells us that + we really are looking at a board resource. */ + nubus_get_rsrc_mem(nbtdata, &ent, 8); + printk(KERN_INFO " type: [cat 0x%x type 0x%x hw 0x%x sw 0x%x]\n", + nbtdata[0], nbtdata[1], nbtdata[2], + nbtdata[3]); + if (nbtdata[0] != 1 || nbtdata[1] != 0 || + nbtdata[2] != 0 || nbtdata[3] != 0) + printk(KERN_ERR "this sResource is not a board resource!\n"); + break; + } + case NUBUS_RESID_NAME: + nubus_get_rsrc_str(board->name, &ent, 64); + printk(KERN_INFO " name: %s\n", board->name); + break; + case NUBUS_RESID_ICON: + nubus_get_icon(board, &ent); + break; + case NUBUS_RESID_BOARDID: + printk(KERN_INFO " board id: 0x%x\n", ent.data); + break; + case NUBUS_RESID_PRIMARYINIT: + printk(KERN_INFO " primary init offset: 0x%06x\n", ent.data); + break; + case NUBUS_RESID_VENDORINFO: + nubus_get_vendorinfo(board, &ent); + break; + case NUBUS_RESID_FLAGS: + printk(KERN_INFO " flags: 0x%06x\n", ent.data); + break; + case NUBUS_RESID_HWDEVID: + printk(KERN_INFO " hwdevid: 0x%06x\n", ent.data); + break; + case NUBUS_RESID_SECONDINIT: + printk(KERN_INFO " secondary init offset: 0x%06x\n", ent.data); + break; + /* WTF isn't this in the functional resources? */ + case NUBUS_RESID_VIDNAMES: + nubus_get_vidnames(board, &ent); + break; + /* Same goes for this */ + case NUBUS_RESID_VIDMODES: + printk(KERN_INFO " video mode parameter directory offset: 0x%06x\n", + ent.data); + break; + default: + printk(KERN_INFO " unknown resource %02X, data 0x%06x\n", + ent.type, ent.data); + } + } + return 0; +} + +/* Attempt to bypass the somewhat non-obvious arrangement of + sResources in the motherboard ROM */ +static void __init nubus_find_rom_dir(struct nubus_board* board) +{ + unsigned char* rp; + unsigned char* romdir; + struct nubus_dir dir; + struct nubus_dirent ent; + + /* Check for the extra directory just under the format block */ + rp = board->fblock; + nubus_rewind(&rp, 4, board->lanes); + if (nubus_get_rom(&rp, 4, board->lanes) != NUBUS_TEST_PATTERN) { + /* OK, the ROM was telling the truth */ + board->directory = board->fblock; + nubus_move(&board->directory, + nubus_expand32(board->doffset), + board->lanes); + return; + } + + /* On "slot zero", you have to walk down a few more + directories to get to the equivalent of a real card's root + directory. We don't know what they were smoking when they + came up with this. */ + romdir = nubus_rom_addr(board->slot); + nubus_rewind(&romdir, ROM_DIR_OFFSET, board->lanes); + dir.base = dir.ptr = romdir; + dir.done = 0; + dir.mask = board->lanes; + + /* This one points to an "Unknown Macintosh" directory */ + if (nubus_readdir(&dir, &ent) == -1) + goto badrom; + + if (console_loglevel >= 10) + printk(KERN_INFO "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data); + /* This one takes us to where we want to go. */ + if (nubus_readdir(&dir, &ent) == -1) + goto badrom; + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data); + nubus_get_subdir(&ent, &dir); + + /* Resource ID 01, also an "Unknown Macintosh" */ + if (nubus_readdir(&dir, &ent) == -1) + goto badrom; + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data); + + /* FIXME: the first one is *not* always the right one. We + suspect this has something to do with the ROM revision. + "The HORROR ROM" (LC-series) uses 0x7e, while "The HORROR + Continues" (Q630) uses 0x7b. The DAFB Macs evidently use + something else. Please run "Slots" on your Mac (see + include/linux/nubus.h for where to get this program) and + tell us where the 'SiDirPtr' for Slot 0 is. If you feel + brave, you should also use MacsBug to walk down the ROM + directories like this function does and try to find the + path to that address... */ + if (nubus_readdir(&dir, &ent) == -1) + goto badrom; + if (console_loglevel >= 10) + printk(KERN_DEBUG "nubus_get_rom_dir: entry %02x %06x\n", ent.type, ent.data); + + /* Bwahahahaha... */ + nubus_get_subdir(&ent, &dir); + board->directory = dir.base; + return; + + /* Even more evil laughter... */ + badrom: + board->directory = board->fblock; + nubus_move(&board->directory, nubus_expand32(board->doffset), board->lanes); + printk(KERN_ERR "nubus_get_rom_dir: ROM weirdness! Notify the developers...\n"); +} + +/* Add a board (might be many devices) to the list */ +static struct nubus_board* __init nubus_add_board(int slot, int bytelanes) +{ + struct nubus_board* board; + struct nubus_board** boardp; + + unsigned char *rp; + unsigned long dpat; + struct nubus_dir dir; + struct nubus_dirent ent; + + /* Move to the start of the format block */ + rp = nubus_rom_addr(slot); + nubus_rewind(&rp, FORMAT_BLOCK_SIZE, bytelanes); + + /* Actually we should probably panic if this fails */ + if ((board = kmalloc(sizeof(*board), GFP_ATOMIC)) == NULL) + return NULL; + memset(board, 0, sizeof(*board)); + board->fblock = rp; + + /* Dump the format block for debugging purposes */ + if (console_loglevel >= 10) { + int i; + printk(KERN_DEBUG "Slot %X, format block at 0x%p\n", + slot, rp); + printk(KERN_DEBUG "Format block: "); + for (i = 0; i < FORMAT_BLOCK_SIZE; i += 4) { + unsigned short foo, bar; + foo = nubus_get_rom(&rp, 2, bytelanes); + bar = nubus_get_rom(&rp, 2, bytelanes); + printk("%04x %04x ", foo, bar); + } + printk("\n"); + rp = board->fblock; + } + + board->slot = slot; + board->slot_addr = (unsigned long) nubus_slot_addr(slot); + board->doffset = nubus_get_rom(&rp, 4, bytelanes); + /* rom_length is *supposed* to be the total length of the + * ROM. In practice it is the "amount of ROM used to compute + * the CRC." So some jokers decide to set it to zero and + * set the crc to zero so they don't have to do any math. + * See the Performa 460 ROM, for example. Those Apple "engineers". + */ + board->rom_length = nubus_get_rom(&rp, 4, bytelanes); + board->crc = nubus_get_rom(&rp, 4, bytelanes); + board->rev = nubus_get_rom(&rp, 1, bytelanes); + board->format = nubus_get_rom(&rp,1, bytelanes); + board->lanes = bytelanes; + + /* Directory offset should be small and negative... */ + if(!(board->doffset & 0x00FF0000)) + printk(KERN_WARNING "Dodgy doffset!\n"); + dpat = nubus_get_rom(&rp, 4, bytelanes); + if(dpat != NUBUS_TEST_PATTERN) + printk(KERN_WARNING "Wrong test pattern %08lx!\n", dpat); + + /* + * I wonder how the CRC is meant to work - + * any takers ? + * CSA: According to MAC docs, not all cards pass the CRC anyway, + * since the initial Macintosh ROM releases skipped the check. + */ + + /* Attempt to work around slot zero weirdness */ + nubus_find_rom_dir(board); + nubus_get_root_dir(board, &dir); + + /* We're ready to rock */ + printk(KERN_INFO "Slot %X:\n", slot); + + /* Each slot should have one board resource and any number of + functional resources. So we'll fill in some fields in the + struct nubus_board from the board resource, then walk down + the list of functional resources, spinning out a nubus_dev + for each of them. */ + if (nubus_readdir(&dir, &ent) == -1) { + /* We can't have this! */ + printk(KERN_ERR "Board resource not found!\n"); + return NULL; + } else { + printk(KERN_INFO " Board resource:\n"); + nubus_get_board_resource(board, slot, &ent); + } + + /* Aaaarrrrgghh! The LC III motherboard has *two* board + resources. I have no idea WTF to do about this. */ + + while (nubus_readdir(&dir, &ent) != -1) { + struct nubus_dev* dev; + struct nubus_dev** devp; + dev = nubus_get_functional_resource(board, slot, &ent); + if (dev == NULL) + continue; + + /* We zeroed this out above */ + if (board->first_dev == NULL) + board->first_dev = dev; + + /* Put it on the global NuBus device chain. Keep entries in order. */ + for (devp=&nubus_devices; *devp!=NULL; devp=&((*devp)->next)) + /* spin */; + *devp = dev; + dev->next = NULL; + } + + /* Put it on the global NuBus board chain. Keep entries in order. */ + for (boardp=&nubus_boards; *boardp!=NULL; boardp=&((*boardp)->next)) + /* spin */; + *boardp = board; + board->next = NULL; + + return board; +} + +void __init nubus_probe_slot(int slot) +{ + unsigned char dp; + unsigned char* rp; + int i; + + rp = nubus_rom_addr(slot); + for(i = 4; i; i--) + { + unsigned long flags; + int card_present; + + rp--; + local_irq_save(flags); + card_present = hwreg_present(rp); + local_irq_restore(flags); + + if (!card_present) + continue; + + printk(KERN_DEBUG "Now probing slot %X at %p\n", slot, rp); + dp = *rp; + if(dp == 0) + continue; + + /* The last byte of the format block consists of two + nybbles which are "mirror images" of each other. + These show us the valid bytelanes */ + if ((((dp>>4) ^ dp) & 0x0F) != 0x0F) + continue; + /* Check that this value is actually *on* one of the + bytelanes it claims are valid! */ + if ((dp & 0x0F) >= (1<<i)) + continue; + + /* Looks promising. Let's put it on the list. */ + nubus_add_board(slot, dp); + + return; + } +} + +#if defined(CONFIG_PROC_FS) + +/* /proc/nubus stuff */ + +static int sprint_nubus_board(struct nubus_board* board, char* ptr, int len) +{ + if(len < 100) + return -1; + + sprintf(ptr, "Slot %X: %s\n", + board->slot, board->name); + + return strlen(ptr); +} + +static int nubus_read_proc(char *page, char **start, off_t off, + int count, int *eof, void *data) +{ + int nprinted, len, begin = 0; + int size = PAGE_SIZE; + struct nubus_board* board; + + len = sprintf(page, "Nubus devices found:\n"); + /* Walk the list of NuBus boards */ + for (board = nubus_boards; board != NULL; board = board->next) + { + nprinted = sprint_nubus_board(board, page + len, size - len); + if (nprinted < 0) + break; + len += nprinted; + if (len+begin < off) { + begin += len; + len = 0; + } + if (len+begin >= off+count) + break; + } + if (len+begin < off) + *eof = 1; + off -= begin; + *start = page + off; + len -= off; + if (len>count) + len = count; + if (len<0) + len = 0; + return len; +} +#endif + +void __init nubus_scan_bus(void) +{ + int slot; + /* This might not work on your machine */ +#ifdef I_WANT_TO_PROBE_SLOT_ZERO + nubus_probe_slot(0); +#endif + for(slot = 9; slot < 15; slot++) + { + nubus_probe_slot(slot); + } +} + +static int __init nubus_init(void) +{ + if (!MACH_IS_MAC) + return 0; + + /* Initialize the NuBus interrupts */ + if (oss_present) { + oss_nubus_init(); + } else { + via_nubus_init(); + } + +#ifdef TRY_TO_DODGE_WSOD + /* Rogue Ethernet interrupts can kill the machine if we don't + do this. Obviously this is bogus. Hopefully the local VIA + gurus can fix the real cause of the problem. */ + mdelay(1000); +#endif + + /* And probe */ + printk("NuBus: Scanning NuBus slots.\n"); + nubus_devices = NULL; + nubus_boards = NULL; + nubus_scan_bus(); + +#ifdef CONFIG_PROC_FS + create_proc_read_entry("nubus", 0, NULL, nubus_read_proc, NULL); + nubus_proc_init(); +#endif + return 0; +} + +subsys_initcall(nubus_init); |
