diff options
Diffstat (limited to 'src/roms/SLOF/board-qemu/slof/pci-phb.fs')
| -rw-r--r-- | src/roms/SLOF/board-qemu/slof/pci-phb.fs | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/src/roms/SLOF/board-qemu/slof/pci-phb.fs b/src/roms/SLOF/board-qemu/slof/pci-phb.fs new file mode 100644 index 0000000..a8fb7ca --- /dev/null +++ b/src/roms/SLOF/board-qemu/slof/pci-phb.fs @@ -0,0 +1,337 @@ +\ ***************************************************************************** +\ * Copyright (c) 2004, 2011 IBM Corporation +\ * All rights reserved. +\ * This program and the accompanying materials +\ * are made available under the terms of the BSD License +\ * which accompanies this distribution, and is available at +\ * http://www.opensource.org/licenses/bsd-license.php +\ * +\ * Contributors: +\ * IBM Corporation - initial implementation +\ ****************************************************************************/ + +\ PAPR PCI host bridge. + +0 VALUE phb-debug? + + +." Populating " pwd cr + +\ needed to find the right path in the device tree +: decode-unit ( addr len -- phys.lo ... phys.hi ) + 2 hex-decode-unit \ decode string + b lshift swap \ shift the devicenumber to the right spot + 8 lshift or \ add the functionnumber + \ my-bus 10 lshift or \ add the busnumber (assume always bus 0) + 0 0 rot \ make phys.lo = 0 = phys.mid +; + +\ needed to have the right unit address in the device tree listing +\ phys.lo=phys.mid=0 , phys.hi=config-address +: encode-unit ( phys.lo phys-mid phys.hi -- unit-str unit-len ) + nip nip \ forget the phys.lo and phys.mid + dup 8 rshift 7 and swap \ calculate function number + B rshift 1F and \ calculate device number + over IF 2 ELSE nip 1 THEN \ create string with dev#,fn# or dev# only? + hex-encode-unit +; + + +0 VALUE my-puid + +: setup-puid + s" reg" get-node get-property 0= IF + decode-64 to my-puid 2drop + THEN +; + +setup-puid + +: config-b@ puid >r my-puid TO puid rtas-config-b@ r> TO puid ; +: config-w@ puid >r my-puid TO puid rtas-config-w@ r> TO puid ; +: config-l@ puid >r my-puid TO puid rtas-config-l@ r> TO puid ; + +\ define the config writes +: config-b! puid >r my-puid TO puid rtas-config-b! r> TO puid ; +: config-w! puid >r my-puid TO puid rtas-config-w! r> TO puid ; +: config-l! puid >r my-puid TO puid rtas-config-l! r> TO puid ; + + +: map-in ( phys.lo phys.mid phys.hi size -- virt ) + phb-debug? IF cr ." map-in called: " .s cr THEN + \ Ignore the size, phys.lo and phys.mid, get BAR from config space + drop nip nip ( phys.hi ) + \ Sanity check whether config address is in expected range: + dup FF AND dup 10 28 WITHIN NOT swap 30 <> AND IF + cr ." phys.hi = " . cr + ABORT" map-in with illegal config space address" + THEN + 00FFFFFF AND \ Need only bus-dev-fn+register bits + dup config-l@ ( phys.hi' bar.lo ) + dup 7 AND 4 = IF \ Is it a 64-bit BAR? + swap 4 + config-l@ lxjoin \ Add upper part of 64-bit BAR + ELSE + nip + THEN + F NOT AND \ Clear indicator bits + translate-my-address + phb-debug? IF ." map-in done: " .s cr THEN +; + +: map-out ( virt size -- ) + phb-debug? IF ." map-out called: " .s cr THEN + 2drop +; + + +: dma-alloc ( size -- virt ) + phb-debug? IF cr ." dma-alloc called: " .s cr THEN + fff + fff not and \ Align size to next 4k boundary + alloc-mem + \ alloc-mem always returns aligned memory - double check just to be sure + dup fff and IF + ." Warning: dma-alloc got unaligned memory!" cr + THEN +; + +: dma-free ( virt size -- ) + phb-debug? IF cr ." dma-free called: " .s cr THEN + fff + fff not and \ Align size to next 4k boundary + free-mem +; + + +\ Helper variables for dma-map-in and dma-map-out +0 VALUE dma-window-liobn \ Logical I/O bus number +0 VALUE dma-window-base \ Start address of window +0 VALUE dma-window-size \ Size of the window + +0 VALUE bm-handle \ Bitmap allocator handle +0 VALUE my-virt +0 VALUE my-size +0 VALUE dev-addr +0 VALUE tmp-dev-addr + +\ Read helper variables (LIOBN, DMA window base and size) from the +\ "ibm,dma-window" property. This property can be either located +\ in the PCI device node or in the bus node, so we've got to use the +\ "calling-child" variable here to get to the node that initiated the call. +\ XXX We should search all the way up the tree to the PHB ... +: (init-dma-window-vars) ( -- ) +\ ." Foo called in " pwd cr +\ ." calling child is " calling-child .node cr +\ ." parent is " calling-child parent .node cr + s" ibm,dma-window" calling-child get-property IF + s" ibm,dma-window" calling-child parent get-property + ABORT" no dma-window property available" + THEN + decode-int TO dma-window-liobn + decode-64 TO dma-window-base + decode-64 TO dma-window-size + 2drop + bm-handle 0= IF + dma-window-base dma-window-size 1000 bm-allocator-init to bm-handle + \ Sometimes the window-base appears as zero, that does not + \ go well with NULL pointers. So block this address + dma-window-base 0= IF + bm-handle 1000 bm-alloc drop + THEN + THEN +; + +: (clear-dma-window-vars) ( -- ) + 0 TO dma-window-liobn + 0 TO dma-window-base + 0 TO dma-window-size +; + +\ We assume that firmware never maps more than the whole dma-window-size +\ so we cheat by calculating the remainder of addr/windowsize instead +\ of taking care to maintain a list of assigned device addresses +: dma-virt2dev ( virt -- devaddr ) + dma-window-size mod dma-window-base + +; + +: dma-map-in ( virt size cachable? -- devaddr ) + phb-debug? IF cr ." dma-map-in called: " .s cr THEN + (init-dma-window-vars) + drop ( virt size ) + + to my-size + to my-virt + bm-handle my-size bm-alloc + to dev-addr + dev-addr 0 < IF + ." Bitmap allocation Failed " dev-addr . + FALSE EXIT + THEN + dev-addr to tmp-dev-addr + + my-virt my-size + bounds dup >r ( v+s virt R: virt ) + swap fff + fff not and \ Align end to next 4k boundary + swap fff not and ( v+s' virt' R: virt ) + ?DO + \ ." mapping " i . cr + dma-window-liobn \ liobn + tmp-dev-addr \ ioba + i 3 OR \ Make a read- & writeable TCE + ( liobn ioba tce R: virt ) + hv-put-tce ABORT" H_PUT_TCE failed" + tmp-dev-addr 1000 + to tmp-dev-addr + 1000 +LOOP + r> drop + my-virt FFF and dev-addr or + (clear-dma-window-vars) +; + +: dma-map-out ( virt devaddr size -- ) + phb-debug? IF cr ." dma-map-out called: " .s cr THEN + (init-dma-window-vars) + to my-size + to dev-addr + to my-virt + dev-addr fff not and to dev-addr + dev-addr to tmp-dev-addr + + my-virt my-size ( virt size ) + bounds ( v+s virt ) + swap fff + fff not and \ Align end to next 4k boundary + swap fff not and ( v+s' virt' ) + ?DO + \ ." unmapping " i . cr + dma-window-liobn \ liobn + tmp-dev-addr \ ioba + i \ Lowest bits not set => invalid TCE + ( liobn ioba tce ) + hv-put-tce ABORT" H_PUT_TCE failed" + tmp-dev-addr 1000 + to tmp-dev-addr + 1000 +LOOP + bm-handle dev-addr my-size bm-free + (clear-dma-window-vars) +; + +: dma-sync ( virt devaddr size -- ) + phb-debug? IF cr ." dma-sync called: " .s cr THEN + \ TODO: Call flush-cache or sync here? + 3drop +; + + +: open true ; +: close ; + +\ Parse the "ranges" property of the root pci node to decode the available +\ memory ranges. See "PCI Bus Binding to IEEE Std 1275-1994" for details. +\ The memory ranges are then used for setting up the device bars (if necessary) +: phb-parse-ranges ( -- ) + \ First clear everything, in case there is something missing in the ranges + 0 pci-next-io ! + 0 pci-max-io ! + 0 pci-next-mem ! + 0 pci-max-mem ! + 0 pci-next-mmio ! + 0 pci-max-mmio ! + 0 pci-next-mem64 ! + 0 pci-max-mem64 ! + + \ Now get the "ranges" property + s" ranges" get-node get-property 0<> ABORT" ranges property not found" + ( prop-addr prop-len ) + BEGIN + dup + WHILE + decode-int \ Decode phys.hi + 3000000 AND \ Filter out address space in phys.hi + CASE + 1000000 OF \ I/O space? + decode-64 dup >r pci-next-io ! \ Decode PCI base address + decode-64 drop \ Forget the parent address + decode-64 r> + pci-max-io ! \ Decode size & calc max address + pci-next-io @ 0= IF + pci-next-io @ 10 + pci-next-io ! \ BARs must not be set to zero + THEN + ENDOF + 2000000 OF \ 32-bit memory space? + decode-64 pci-next-mem ! \ Decode mem base address + decode-64 drop \ Forget the parent address + decode-64 2 / dup >r \ Decode and calc size/2 + pci-next-mem @ + dup pci-max-mem ! \ and calc max mem address + dup pci-next-mmio ! \ which is the same as MMIO base + r> + pci-max-mmio ! \ calc max MMIO address + ENDOF + 3000000 OF \ 64-bit memory space? + decode-64 pci-next-mem64 ! + decode-64 drop \ Forget the parent address + decode-64 pci-max-mem64 ! + ENDOF + ENDCASE + REPEAT + ( prop-addr prop-len ) + 2drop + + phb-debug? IF + ." pci-next-io = " pci-next-io @ . cr + ." pci-max-io = " pci-max-io @ . cr + ." pci-next-mem = " pci-next-mem @ . cr + ." pci-max-mem = " pci-max-mem @ . cr + ." pci-next-mmio = " pci-next-mmio @ . cr + ." pci-max-mmio = " pci-max-mmio @ . cr + ." pci-next-mem64 = " pci-next-mem64 @ . cr + ." pci-max-mem64 = " pci-max-mem64 @ . cr + THEN +; + +: phb-pci-walk-bridge ( -- ) + phb-debug? IF ." Calling pci-walk-bridge " pwd cr THEN + + get-node child ?dup 0= IF EXIT THEN \ get and check if we have children + 0 to pci-device-slots \ reset slot array to unpoppulated + BEGIN + dup \ Continue as long as there are children + WHILE + dup set-node \ Set child node as current node + my-space pci-set-slot \ set the slot bit + my-space pci-htype@ \ read HEADER-Type + 7f and \ Mask bit 7 - multifunction device + CASE + 0 OF my-space pci-device-setup ENDOF \ | set up the device + 1 OF my-space pci-bridge-setup ENDOF \ | set up the bridge + dup OF my-space pci-htype@ pci-out ENDOF + ENDCASE + peer + REPEAT drop + get-parent set-node +; + +\ Landing routing to probe the popuated device tree +: phb-pci-probe-bus ( busnr -- ) + drop phb-pci-walk-bridge +; + +\ Stub routine, as qemu has enumerated, we already have the device +\ properties set. +: phb-pci-device-props ( addr -- ) + dup pci-class-name device-name + dup pci-device-assigned-addresses-prop + drop +; + +\ Scan the child nodes of the pci root node to assign bars, fixup +\ properties etc. +: phb-setup-children + puid >r \ Save old value of puid + my-puid TO puid \ Set current puid + phb-parse-ranges + 1 TO pci-hotplug-enabled + s" qemu,phb-enumerated" get-node get-property 0<> IF + 1 0 (probe-pci-host-bridge) + ELSE + 2drop + ['] phb-pci-probe-bus TO func-pci-probe-bus + ['] phb-pci-device-props TO func-pci-device-props + phb-pci-walk-bridge \ PHB device tree is already populated. + THEN + r> TO puid \ Restore previous puid +; +phb-setup-children |
