forked from KolibriOS/kolibrios
145 lines
4.0 KiB
Plaintext
145 lines
4.0 KiB
Plaintext
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) 2010 KolibriOS team. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; HT.inc ;; ;;
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;; ;;
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;; AMD HyperTransport bus control ;;
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;; ;;
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;; art_zh <artem@jerdev.co.uk> ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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align 4
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;=============================================================================
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;
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; This code is a part of Kolibri-A and will only work with AMD RS760+ chipsets
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;
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;=============================================================================
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;------------------------------------------
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; params: al = nbconfig register#
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; returns: eax = register content
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;
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rs7xx_nbconfig_read_pci:
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and eax, 0x0FC ; leave register# only
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or eax, 0x80000000 ; bdf = 0:0.0
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mov dx, 0x0CF8 ; write to index reg
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out dx, eax
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add dl, 4
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in eax, dx
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ret
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rs7xx_nbconfig_flush_pci:
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mov eax, 0x0B0 ; a scratch reg
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mov dx, 0xCF8
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out dx, eax
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ret
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rs7xx_nbconfig_write_pci:
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and eax, 0x0FC ; leave register# only
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or eax, 0x80000000 ; bdf = 0:0.0
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mov dx, 0x0CF8 ; write to index reg
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out dx, eax
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add dl, 4
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mov eax, ebx
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out dx, eax
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ret
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;***************************************************************************
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; Function
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; rs7xx_pcie_init:
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;
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; Description
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; PCIe extended (memory-mapped) config space detection
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;
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;***************************************************************************
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rs7xx_pcie_init:
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; mov al, 0x7C ; NB_IOC_CFG_CNTL
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; mov ebx, 0x20000000
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; call rs7xx_nbconfig_write_pci
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mov al, 0x7C ; NB_IOC_CFG_CNTL
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call rs7xx_nbconfig_read_pci
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mov ebx, eax
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call rs7xx_nbconfig_flush_pci
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test ebx, 0x20000000 ; BAR3 locked?
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jz .rs7xx_pcie_blocked
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mov al, 0x84 ; NB_PCI_ARB
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call rs7xx_nbconfig_read_pci
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shr eax,16
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and ax, 7 ; the Bus range lays here:
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jnz @f
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mov ax, 8 ; 1=2Mb, 2=4MB, 3=8MB, 4=16MB
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@@:
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mov [PCIe_bus_range], ax ; 5=32Mb, 6=64MB, 7=128Mb, 8=256Mb
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mov cl, al
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call rs7xx_nbconfig_flush_pci
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dec cl ; <4M ?
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jnz @f
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inc cl ; one PDE needed anyway
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@@:
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dec cl
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mov ebx, 1
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shl ebx, cl
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mov [mmio_pcie_cfg_pdes], bx ; 1..64 PDE(s) needed,
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shl ebx, 22
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mov [mmio_pcie_cfg_lim], ebx ; or 4..256Mb space to map
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dec [mmio_pcie_cfg_lim]
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mov al, 0x1C ; NB_BAR3_PCIEXP_MMCFG
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call rs7xx_nbconfig_read_pci
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mov ebx, eax
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call rs7xx_nbconfig_flush_pci
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mov eax, ebx
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and eax, 0xFFE00000 ; valid bits [31..21]
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jnz @f ; NB BAR3 may be invisible!
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call pci_ext_config ; try to get pcie ecfg address indirectly
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@@:
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or eax, eax
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jz .rs7xx_pcie_fail
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mov [mmio_pcie_cfg_addr], eax ; physical address (lower 32 bits)
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add [mmio_pcie_cfg_lim], eax
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; -- map the whole PCIe config space;
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or eax, (PG_SHARED + PG_LARGE + PG_UW) ; by the way, UW is unsafe!
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mov ecx, PCIe_CONFIG_SPACE ; linear address
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mov ebx, ecx
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shr ebx, 20
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add ebx, sys_pgdir ; PgDir entry @
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xor dx, dx ; PDEs counter
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@@:
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mov dword[ebx], eax ; map 4 buses
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invlpg [ecx] ; next PgDir entry
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add bx, 4 ; new PDE
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add eax, 0x400000 ; +4M phys.
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add ecx, 0x400000 ; +4M lin.
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inc dx
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cmp dx, [mmio_pcie_cfg_pdes] ; all mapped yet?
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jnz @b
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.pcie_cfg_mapped:
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mov esi, boot_pcie_ok
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call boot_log
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ret ; <<<<<<<<<<< OK >>>>>>>>>>>
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.rs7xx_pcie_fail:
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mov esi, boot_rs7xx_fail
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call boot_log
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ret
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.rs7xx_pcie_blocked:
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mov esi, boot_rs7xx_blkd
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call boot_log
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ret
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