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author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-07-26 14:51:22 +0200 |
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committer | Jonathan Corbet <corbet@lwn.net> | 2019-07-31 21:30:10 +0200 |
commit | 6d6486a0c59759681e75d1a2bd6684c501fcbd0e (patch) | |
tree | b2ddb0e5650ed2794c14bc810bf1fbafeb2aff00 /Documentation/m68k | |
parent | docs: admin-guide: add auxdisplay files to it after conversion to ReST (diff) | |
download | linux-6d6486a0c59759681e75d1a2bd6684c501fcbd0e.tar.xz linux-6d6486a0c59759681e75d1a2bd6684c501fcbd0e.zip |
docs: README.buddha: convert to ReST and add to m68k book
Adjust the file for it to be properly parsed by Sphinx, adding
it to the index of the book it belongs.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/m68k')
-rw-r--r-- | Documentation/m68k/buddha-driver.rst (renamed from Documentation/m68k/README.buddha) | 95 | ||||
-rw-r--r-- | Documentation/m68k/index.rst | 1 |
2 files changed, 48 insertions, 48 deletions
diff --git a/Documentation/m68k/README.buddha b/Documentation/m68k/buddha-driver.rst index 3ea9827ba3c7..20e401413991 100644 --- a/Documentation/m68k/README.buddha +++ b/Documentation/m68k/buddha-driver.rst @@ -1,3 +1,6 @@ +===================================== +Amiga Buddha and Catweasel IDE Driver +===================================== The Amiga Buddha and Catweasel IDE Driver (part of ide.c) was written by Geert Uytterhoeven based on the following specifications: @@ -12,12 +15,12 @@ described in their manuals, no tricks have been used (for example leaving some address lines out of the equations...). If you want to configure the board yourself (for example let a Linux kernel configure the card), look at the Commodore -Docs. Reading the nibbles should give this information: +Docs. Reading the nibbles should give this information:: -Vendor number: 4626 ($1212) -product number: 0 (42 for Catweasel Z-II) -Serial number: 0 -Rom-vector: $1000 + Vendor number: 4626 ($1212) + product number: 0 (42 for Catweasel Z-II) + Serial number: 0 + Rom-vector: $1000 The card should be a Z-II board, size 64K, not for freemem list, Rom-Vektor is valid, no second Autoconfig-board on the @@ -34,6 +37,7 @@ otherwise your chance is only 1:16 to find the board :-). The local memory-map is even active when mapped to $e8: +============== =========================================== $0-$7e Autokonfig-space, see Z-II docs. $80-$7fd reserved @@ -50,50 +54,51 @@ $a00-$aff IDE-Select 2 (Port 1, Register set 0) $b00-$bff IDE-Select 3 (Port 1, Register set 1) $c00-$cff IDE-Select 4 (Port 2, Register set 0, - Catweasel only!) + Catweasel only!) $d00-$dff IDE-Select 5 (Port 3, Register set 1, - Catweasel only!) + Catweasel only!) -$e00-$eff local expansion port, on Catweasel Z-II the +$e00-$eff local expansion port, on Catweasel Z-II the Catweasel registers are also mapped here. Never touch, use multidisk.device! - -$f00 read only, Byte-access: Bit 7 shows the - level of the IRQ-line of IDE port 0. + +$f00 read only, Byte-access: Bit 7 shows the + level of the IRQ-line of IDE port 0. $f01-$f3f mirror of $f00 -$f40 read only, Byte-access: Bit 7 shows the - level of the IRQ-line of IDE port 1. +$f40 read only, Byte-access: Bit 7 shows the + level of the IRQ-line of IDE port 1. $f41-$f7f mirror of $f40 -$f80 read only, Byte-access: Bit 7 shows the - level of the IRQ-line of IDE port 2. +$f80 read only, Byte-access: Bit 7 shows the + level of the IRQ-line of IDE port 2. (Catweasel only!) $f81-$fbf mirror of $f80 $fc0 write-only: Writing any value to this - register enables IRQs to be passed from the - IDE ports to the Zorro bus. This mechanism - has been implemented to be compatible with + register enables IRQs to be passed from the + IDE ports to the Zorro bus. This mechanism + has been implemented to be compatible with harddisks that are either defective or have - a buggy firmware and pull the IRQ line up - while starting up. If interrupts would - always be passed to the bus, the computer - might not start up. Once enabled, this flag - can not be disabled again. The level of the - flag can not be determined by software + a buggy firmware and pull the IRQ line up + while starting up. If interrupts would + always be passed to the bus, the computer + might not start up. Once enabled, this flag + can not be disabled again. The level of the + flag can not be determined by software (what for? Write to me if it's necessary!). $fc1-$fff mirror of $fc0 $1000-$ffff Buddha-Rom with offset $1000 in the rom - chip. The addresses $0 to $fff of the rom + chip. The addresses $0 to $fff of the rom chip cannot be read. Rom is Byte-wide and mapped to even addresses. +============== =========================================== The IDE ports issue an INT2. You can read the level of the IRQ-lines of the IDE-ports by reading from the three (two @@ -128,7 +133,8 @@ must always be set to 1 to be compatible with later Buddha versions (if I'll ever update this one). I presume that I'll never use the lower four bits, but they have to be set to 1 by definition. - The values in this table have to be shifted 5 bits to the + +The values in this table have to be shifted 5 bits to the left and or'd with $1f (this sets the lower 5 bits). All the timings have in common: Select and IOR/IOW rise at @@ -138,44 +144,36 @@ values are no multiple of 71. One clock-cycle is 71ns long (exactly 70,5 at 14,18 Mhz on PAL systems). value 0 (Default after reset) - -497ns Select (7 clock cycles) , IOR/IOW after 172ns (2 clock cycles) -(same timing as the Amiga 1200 does on it's IDE port without -accelerator card) + 497ns Select (7 clock cycles) , IOR/IOW after 172ns (2 clock cycles) + (same timing as the Amiga 1200 does on it's IDE port without + accelerator card) value 1 - -639ns Select (9 clock cycles), IOR/IOW after 243ns (3 clock cycles) + 639ns Select (9 clock cycles), IOR/IOW after 243ns (3 clock cycles) value 2 - -781ns Select (11 clock cycles), IOR/IOW after 314ns (4 clock cycles) + 781ns Select (11 clock cycles), IOR/IOW after 314ns (4 clock cycles) value 3 - -355ns Select (5 clock cycles), IOR/IOW after 101ns (1 clock cycle) + 355ns Select (5 clock cycles), IOR/IOW after 101ns (1 clock cycle) value 4 - -355ns Select (5 clock cycles), IOR/IOW after 172ns (2 clock cycles) + 355ns Select (5 clock cycles), IOR/IOW after 172ns (2 clock cycles) value 5 - -355ns Select (5 clock cycles), IOR/IOW after 243ns (3 clock cycles) + 355ns Select (5 clock cycles), IOR/IOW after 243ns (3 clock cycles) value 6 - -1065ns Select (15 clock cycles), IOR/IOW after 314ns (4 clock cycles) + 1065ns Select (15 clock cycles), IOR/IOW after 314ns (4 clock cycles) value 7 - -355ns Select, (5 clock cycles), IOR/IOW after 101ns (1 clock cycle) + 355ns Select, (5 clock cycles), IOR/IOW after 101ns (1 clock cycle) When accessing IDE registers with A6=1 (for example $84x), the timing will always be mode 0 8-bit compatible, no matter what you have selected in the speed register: -781ns select, IOR/IOW after 4 clock cycles (=314ns) aktive. +781ns select, IOR/IOW after 4 clock cycles (=314ns) aktive. All the timings with a very short select-signal (the 355ns fast accesses) depend on the accelerator card used in the @@ -204,7 +202,8 @@ always shows a "no IRQ here" on the Buddha, and accesses to the third IDE port are going into data's Nirwana on the Buddha. - Jens Schönfeld february 19th, 1997 - updated may 27th, 1997 - eMail: sysop@nostlgic.tng.oche.de +Jens Schönfeld february 19th, 1997 + +updated may 27th, 1997 +eMail: sysop@nostlgic.tng.oche.de diff --git a/Documentation/m68k/index.rst b/Documentation/m68k/index.rst index 3a5ba7fe1703..b89cb6a86d9b 100644 --- a/Documentation/m68k/index.rst +++ b/Documentation/m68k/index.rst @@ -8,6 +8,7 @@ m68k Architecture :maxdepth: 2 kernel-options + buddha-driver .. only:: subproject and html |