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Rev 1551 Rev 1560
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;;                                                              ;;
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;;                                                              ;;
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;;                  art_zh                  ;;
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;;                  art_zh                  ;;
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;;                                                              ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 1554 $
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align 4
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;=============================================================================
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;=============================================================================
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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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; 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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;=============================================================================
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align 4
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	mov	dx,  0x0CF8		 ; write to index reg
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	mov	dx,  0x0CF8		 ; write to index reg
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	out	dx, eax
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	out	dx, eax
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	add	dl, 4
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	add	dl, 4
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	in	eax, dx
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	in	eax, dx
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	ret
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	ret
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align 4
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rs7xx_nbconfig_flush_pci:
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rs7xx_nbconfig_flush_pci:
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	mov	eax, 0x0B0		; a scratch reg
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	mov	eax, 0x0B0		; a scratch reg
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	mov	dx,  0xCF8
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	mov	dx,  0xCF8
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	out	dx,  eax
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	out	dx,  eax
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	ret
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	ret
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align 4
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rs7xx_nbconfig_write_pci:
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rs7xx_nbconfig_write_pci:
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;   Description
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;   Description
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;       PCIe extended (memory-mapped) config space detection
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;       PCIe extended (memory-mapped) config space detection
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;
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;
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;***************************************************************************
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;***************************************************************************
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align 4
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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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rs7xx_pcie_init:
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	mov	al, 0x7C		       ; NB_IOC_CFG_CNTL
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	mov	al, 0x7C		       ; NB_IOC_CFG_CNTL
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	call	rs7xx_nbconfig_read_pci
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	call	rs7xx_nbconfig_read_pci
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	mov	ebx, eax
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	mov	ebx, eax
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	call	rs7xx_nbconfig_flush_pci
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	call	rs7xx_nbconfig_flush_pci
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	call	rs7xx_nbconfig_read_pci
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	call	rs7xx_nbconfig_read_pci
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	mov	ebx, eax
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	mov	ebx, eax
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	call	rs7xx_nbconfig_flush_pci
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	call	rs7xx_nbconfig_flush_pci
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	mov	eax, ebx
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	mov	eax, ebx
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	and	eax, 0xFFE00000 		; valid bits [31..21]
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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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	jz	.rs7xx_pcie_blocked		; NB BAR3 may be invisible!
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	call  pci_ext_config		; try to get pcie ecfg address indirectly
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						; try to get pcie ecfg address indirectly
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@@:
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	or 	eax, eax
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.addr_found:
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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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	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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	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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	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	ecx, PCIe_CONFIG_SPACE		; linear address
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	mov	ebx, ecx
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	mov	ebx, ecx
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	shr	ebx, 20
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	shr	ebx, 20
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	add	ebx, sys_pgdir			; PgDir entry @
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	mov	dl, byte[mmio_pcie_cfg_pdes]	; 1 page = 4M in address space
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	cmp	dl, (USER_DMA_BUFFER - PCIe_CONFIG_SPACE) / 4194304
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	jb	@f
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	mov	dl, ((USER_DMA_BUFFER - PCIe_CONFIG_SPACE) / 4194304) - 1
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	mov	byte[mmio_pcie_cfg_pdes], dl
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	add	ebx, sys_pgdir			; PgDir entry @
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@@:
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	xor	dx,  dx 				; PDEs counter
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	xor	dx,  dx 			; PDEs counter
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@@:
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@@:
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	mov	dword[ebx], eax 			; map 4 buses
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	mov	dword[ebx], eax 		; map 4 buses
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	invlpg	[ecx]				; next PgDir entry
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	invlpg	[ecx]				; next PgDir entry
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	add	bx,  4				; new PDE
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	add	bx,  4				; new PDE
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	add	eax, 0x400000			; +4M phys.
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	add	eax, 0x400000			; +4M phys.
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	add	ecx, 0x400000			; +4M lin.
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	cmp	dl, byte[mmio_pcie_cfg_pdes]
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	add	ecx, 0x400000			; +4M lin.
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	jnc	.pcie_cfg_mapped
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	inc	dx
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	cmp	dx, [mmio_pcie_cfg_pdes]	; all mapped yet?
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	inc	dl
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	jnz	@b
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	jmp	@b
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.pcie_cfg_mapped:
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.pcie_cfg_mapped:
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	mov	esi, boot_pcie_ok
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	mov	esi, boot_pcie_ok
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	call	boot_log
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	call	boot_log
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	ret	; <<<<<<<<<<< OK >>>>>>>>>>>
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	ret	; <<< OK >>>
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.rs7xx_pcie_fail:
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.rs7xx_pcie_fail:
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	mov	esi, boot_rs7xx_fail
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	mov	esi, boot_rs7xx_fail
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	call	boot_log
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	call	boot_log
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	ret
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	ret
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.rs7xx_pcie_blocked:
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.rs7xx_pcie_blocked:
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	mov	esi, boot_rs7xx_blkd
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	mov	esi, boot_rs7xx_blkd
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	call	boot_log
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	call	pci_ext_config
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	jmp	.addr_found
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	call	boot_log
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