;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) 2010 KolibriOS team. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; HT.inc ;; ;;
;; ;;
;; AMD HyperTransport bus control ;;
;; ;;
;; art_zh <kolibri@jerdev.co.uk> ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 1554 $
NB_MISC_INDEX equ 0xF0000060 ; NB Misc indirect access
NB_MISC_DATA equ 0xF0000064
PCIEIND_INDEX equ 0xF00000E0 ; PCIe Core indirect config space access
HTIU_NB_INDEX equ 0xF0000094 ; HyperTransport indirect config space access
;=============================================================================
;
; This code is a part of Kolibri-A and will only work with AMD RS760+ chipsets
;
;=============================================================================
org $-OS_BASE ; physical addresses needed at initial stage
align 4
;------------------------------------------
; params: al = nbconfig register#
; returns: eax = register content
;
rs7xx_nbconfig_read_pci:
and eax, 0x0FC ; leave register# only
or eax, 0x80000000 ; bdf = 0:0.0
mov dx, 0x0CF8 ; write to index reg
out dx, eax
add dl, 4
in eax, dx
ret
align 4
rs7xx_nbconfig_flush_pci:
mov eax, 0x0B0 ; a scratch reg
mov dx, 0xCF8
out dx, eax
ret
align 4
;------------------------------------------
; params: al = nbconfig register#
; ebx = register content
;
rs7xx_nbconfig_write_pci:
and eax, 0x0FC ; leave register# only
or eax, 0x80000000 ; bdf = 0:0.0
mov dx, 0x0CF8 ; write to index reg
out dx, eax
add dl, 4
mov eax, ebx
out dx, eax
ret
;***************************************************************************
; Function
; rs7xx_unlock_bar3: unlocks the BAR3 register of nbconfig that
; makes pcie config address space visible
; -----------------------
; in: nothing out: nothing destroys: eax ebx edx
;
;***************************************************************************
align 4
rs7xx_unlock_bar3:
mov eax, NB_MISC_INDEX
mov ebx, 0x080 ; NBMISCIND:0x0; write-enable
call rs7xx_nbconfig_write_pci ; set index
mov eax, NB_MISC_DATA
call rs7xx_nbconfig_read_pci ; read data
mov ebx, eax
and ebx, 0xFFFFFFF7 ; clear bit3
mov eax, NB_MISC_DATA
call rs7xx_nbconfig_write_pci ; write it back
mov eax, NB_MISC_INDEX
xor ebx, ebx ; reg#0; write-locked
call rs7xx_nbconfig_write_pci ; set index
ret
;***************************************************************************
; Function
; rs7xx_pcie_init:
;
; Description
; PCIe extended (memory-mapped) config space detection
;
;***************************************************************************
align 4
rs7xx_pcie_init:
call rs7xx_unlock_bar3
mov al, 0x7C ; NB_IOC_CFG_CNTL
call rs7xx_nbconfig_read_pci
mov ebx, eax
; call rs7xx_nbconfig_flush_pci
test ebx, 0x20000000 ; BAR3 locked?
jz $
mov al, 0x84 ; NB_PCI_ARB
call rs7xx_nbconfig_read_pci
shr eax,16
and ax, 7 ; the Bus range lays here:
jnz @f
mov ax, 8 ; 1=2Mb, 2=4MB, 3=8MB, 4=16MB
@@:
mov word[PCIe_bus_range-OS_BASE], ax ; 5=32Mb, 6=64MB, 7=128Mb, 8=256Mb
mov cl, al
call rs7xx_nbconfig_flush_pci
dec cl ; <4M ?
jz @f
dec cl ; one PDE needed anyway
@@:
mov ebx, 1
shl ebx, cl
mov word[mmio_pcie_cfg_pdes-OS_BASE], bx ; 1..64 PDE(s) needed,
shl ebx, 22
mov dword[mmio_pcie_cfg_lim-OS_BASE], ebx ; or 4..256Mb space to map
dec dword[mmio_pcie_cfg_lim-OS_BASE]
mov al, 0x1C ; NB_BAR3_PCIEXP_MMCFG
call rs7xx_nbconfig_read_pci
mov ebx, eax
call rs7xx_nbconfig_flush_pci
mov eax, ebx
and eax, 0xFFE00000 ; valid bits [31..21]
jz $ ; NB BAR3 may be invisible!
.addr_found:
mov dword[mmio_pcie_cfg_addr-OS_BASE], eax ; physical address (lower 32 bits)
add dword[mmio_pcie_cfg_lim-OS_BASE], eax
or eax, (PG_NOCACHE + PG_SHARED + PG_LARGE + PG_UW) ; by the way, UW is unsafe!
mov ecx, PCIe_CONFIG_SPACE ; linear address
mov ebx, ecx
shr ebx, 20
add ebx, (sys_pgdir - OS_BASE) ; PgDir entry @
mov dl, byte[mmio_pcie_cfg_pdes-OS_BASE] ; 1 page = 4M in address space
cmp dl, 0x34 ; =(USER_DMA_BUFFER - PCIe_CONFIG_SPACE) / 4M
jb @f
mov dl, 0x33
mov byte[mmio_pcie_cfg_pdes-OS_BASE], dl
@@:
xor dx, dx ; PDEs counter
.write_pde:
mov dword[ebx], eax ; map 4 buses
add bx, 4 ; new PDE
add eax, 0x400000 ; +4M phys.
add ecx, 0x400000 ; +4M lin.
cmp dl, byte[mmio_pcie_cfg_pdes-OS_BASE]
jae .pcie_cfg_mapped
inc dl
jmp .write_pde
; mov eax, cr3
; mov cr3, eax ; flush TLB
.pcie_cfg_mapped:
ret ; <<< OK >>>
; ================================================================================
org OS_BASE+$ ; back to the linear address space
;--------------------------------------------------------------
align 4
rs780_read_misc:
; in: eax(al) - reg# out: eax = NBMISCIND data
push edx
mov edx, NB_MISC_INDEX
and eax, 0x07F
mov [edx], eax
add dl, 4
mov eax, [edx]
pop edx
ret
;-------------------------------------------
align 4
rs780_write_misc:
; in: eax(al) - reg# ebx = NBMISCIND data
push edx
mov edx, NB_MISC_INDEX
and eax, 0x07F
or eax, 0x080 ; set WE
mov [edx], eax
add dl, 4
mov [edx], ebx
sub dl, 4
xor eax, eax
mov [edx], eax ; safety last
pop edx
ret
;-------------------------------------------------------------
align 4
rs780_read_pcieind:
; in: ah = bridge#, al = reg# out: eax = PCIEIND data
push edx
xor edx, edx
mov ah, dl ; bridge# : 0 = Core+GFX; 0x10 = Core+SB
and dl, 15 ; 0x20 = Core+GPP; 2..12 = a PortBridge
shl edx, 15 ; device#
add edx, PCIEIND_INDEX ; full bdf-address
and eax, 0x30FF
or al, al
jnz @f
shl eax, 4 ; set bits 17..16 for a Core bridge
@@:
mov [edx], eax
add dl, 4
mov eax, [edx]
pop edx
ret
;-------------------------------------------
align 4
rs780_write_pcieind:
; in: ah = bridge#, al = reg#, ebx = PCIEIND data
push edx
xor edx, edx
mov ah, dl ; bridge# : 0 = Core+GFX; 0x10 = Core+SB
and dl, 15 ; 0x20 = Core+GPP; 2..12 = a PortBridge
shl edx, 15 ; device#
add edx, PCIEIND_INDEX ; full bdf-address
and eax, 0x30FF
or al, al
jnz @f
shl eax, 4 ; set bits 17..16 for a Core bridge
@@:
mov [edx], eax
add dl, 4
mov [edx], ebx
sub dl, 4
xor eax, eax
mov [edx], eax ; safety last
pop edx
ret
;------------------------------------------------
align 4
rs780_read_htiu:
; in: al = reg# | out: eax = HTIU data
;------------------------------------------------
push edx
mov edx, HTIU_NB_INDEX
and eax, 0x07F
mov [edx], eax
add dl, 4
mov eax, [edx]
pop edx
ret
;------------------------------------------------
align 4
rs780_write_htiu:
; in: al = reg#; ebx = data
;------------------------------------------------
push edx
mov edx, HTIU_NB_INDEX
and eax, 0x07F
or eax, 0x100
mov [edx], eax
add dl, 4
mov [edx], ebx
sub dl, 4
xor eax, eax
mov [edx], eax
pop edx
ret