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Diffstat (limited to 'drivers/bios_emulator/atibios.c')
| -rw-r--r-- | drivers/bios_emulator/atibios.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/drivers/bios_emulator/atibios.c b/drivers/bios_emulator/atibios.c new file mode 100644 index 0000000..084339c --- /dev/null +++ b/drivers/bios_emulator/atibios.c @@ -0,0 +1,340 @@ +/**************************************************************************** +* +* Video BOOT Graphics Card POST Module +* +* ======================================================================== +* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. +* Jason Jin <Jason.jin@freescale.com> +* +* Copyright (C) 1991-2004 SciTech Software, Inc. All rights reserved. +* +* This file may be distributed and/or modified under the terms of the +* GNU General Public License version 2.0 as published by the Free +* Software Foundation and appearing in the file LICENSE.GPL included +* in the packaging of this file. +* +* Licensees holding a valid Commercial License for this product from +* SciTech Software, Inc. may use this file in accordance with the +* Commercial License Agreement provided with the Software. +* +* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING +* THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR +* PURPOSE. +* +* See http://www.scitechsoft.com/license/ for information about +* the licensing options available and how to purchase a Commercial +* License Agreement. +* +* Contact license@scitechsoft.com if any conditions of this licensing +* are not clear to you, or you have questions about licensing options. +* +* ======================================================================== +* +* Language: ANSI C +* Environment: Linux Kernel +* Developer: Kendall Bennett +* +* Description: Module to implement booting PCI/AGP controllers on the +* bus. We use the x86 real mode emulator to run the BIOS on +* graphics controllers to bring the cards up. +* +* Note that at present this module does *not* support +* multiple controllers. +* +* The orignal name of this file is warmboot.c. +* Jason ported this file to u-boot to run the ATI video card +* BIOS in u-boot. +****************************************************************************/ +#include <common.h> + +#ifdef CONFIG_BIOSEMU + +#include "biosemui.h" +#include <malloc.h> + +/* Length of the BIOS image */ +#define MAX_BIOSLEN (128 * 1024L) + +/* Define some useful types and macros */ +#define true 1 +#define false 0 + +/* Place to save PCI BAR's that we change and later restore */ +static u32 saveROMBaseAddress; +static u32 saveBaseAddress10; +static u32 saveBaseAddress14; +static u32 saveBaseAddress18; +static u32 saveBaseAddress20; + +/**************************************************************************** +PARAMETERS: +pcidev - PCI device info for the video card on the bus to boot +VGAInfo - BIOS emulator VGA info structure + +REMARKS: +This function executes the BIOS POST code on the controller. We assume that +at this stage the controller has its I/O and memory space enabled and +that all other controllers are in a disabled state. +****************************************************************************/ +static void PCI_doBIOSPOST(pci_dev_t pcidev, BE_VGAInfo * VGAInfo) +{ + RMREGS regs; + RMSREGS sregs; + + /* Determine the value to store in AX for BIOS POST. Per the PCI specs, + AH must contain the bus and AL must contain the devfn, encoded as + (dev << 3) | fn + */ + memset(®s, 0, sizeof(regs)); + memset(&sregs, 0, sizeof(sregs)); + regs.x.ax = ((int)PCI_BUS(pcidev) << 8) | + ((int)PCI_DEV(pcidev) << 3) | (int)PCI_FUNC(pcidev); + + /*Setup the X86 emulator for the VGA BIOS*/ + BE_setVGA(VGAInfo); + + /*Execute the BIOS POST code*/ + BE_callRealMode(0xC000, 0x0003, ®s, &sregs); + + /*Cleanup and exit*/ + BE_getVGA(VGAInfo); +} + +/**************************************************************************** +PARAMETERS: +pcidev - PCI device info for the video card on the bus +bar - Place to return the base address register offset to use + +RETURNS: +The address to use to map the secondary BIOS (AGP devices) + +REMARKS: +Searches all the PCI base address registers for the device looking for a +memory mapping that is large enough to hold our ROM BIOS. We usually end up +finding the framebuffer mapping (usually BAR 0x10), and we use this mapping +to map the BIOS for the device into. We use a mapping that is already +assigned to the device to ensure the memory range will be passed through +by any PCI->PCI or AGP->PCI bridge that may be present. + +NOTE: Usually this function is only used for AGP devices, but it may be + used for PCI devices that have already been POST'ed and the BIOS + ROM base address has been zero'ed out. + +NOTE: This function leaves the original memory aperture disabled by leaving + it programmed to all 1's. It must be restored to the correct value + later. +****************************************************************************/ +static u32 PCI_findBIOSAddr(pci_dev_t pcidev, int *bar) +{ + u32 base, size; + + for (*bar = 0x10; *bar <= 0x14; (*bar) += 4) { + pci_read_config_dword(pcidev, *bar, &base); + if (!(base & 0x1)) { + pci_write_config_dword(pcidev, *bar, 0xFFFFFFFF); + pci_read_config_dword(pcidev, *bar, &size); + size = ~(size & ~0xFF) + 1; + if (size >= MAX_BIOSLEN) + return base & ~0xFF; + } + } + return 0; +} + +/**************************************************************************** +REMARKS: +Some non-x86 Linux kernels map PCI relocateable I/O to values that +are above 64K, which will not work with the BIOS image that requires +the offset for the I/O ports to be a maximum of 16-bits. Ideally +someone should fix the kernel to map the I/O ports for VGA compatible +devices to a different location (or just all I/O ports since it is +unlikely you can have enough devices in the machine to use up all +64K of the I/O space - a total of more than 256 cards would be +necessary). + +Anyway to fix this we change all I/O mapped base registers and +chop off the top bits. +****************************************************************************/ +static void PCI_fixupIObase(pci_dev_t pcidev, int reg, u32 * base) +{ + if ((*base & 0x1) && (*base > 0xFFFE)) { + *base &= 0xFFFF; + pci_write_config_dword(pcidev, reg, *base); + + } +} + +/**************************************************************************** +PARAMETERS: +pcidev - PCI device info for the video card on the bus + +RETURNS: +Pointers to the mapped BIOS image + +REMARKS: +Maps a pointer to the BIOS image on the graphics card on the PCI bus. +****************************************************************************/ +void *PCI_mapBIOSImage(pci_dev_t pcidev) +{ + u32 BIOSImagePhys; + int BIOSImageBAR; + u8 *BIOSImage; + + /*Save PCI BAR registers that might get changed*/ + pci_read_config_dword(pcidev, PCI_ROM_ADDRESS, &saveROMBaseAddress); + pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_0, &saveBaseAddress10); + pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_1, &saveBaseAddress14); + pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_2, &saveBaseAddress18); + pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_4, &saveBaseAddress20); + + /*Fix up I/O base registers to less than 64K */ + if(saveBaseAddress14 != 0) + PCI_fixupIObase(pcidev, PCI_BASE_ADDRESS_1, &saveBaseAddress14); + else + PCI_fixupIObase(pcidev, PCI_BASE_ADDRESS_4, &saveBaseAddress20); + + /* Some cards have problems that stop us from being able to read the + BIOS image from the ROM BAR. To fix this we have to do some chipset + specific programming for different cards to solve this problem. + */ + + if ((BIOSImagePhys = PCI_findBIOSAddr(pcidev, &BIOSImageBAR)) == 0) { + printf("Find bios addr error\n"); + return NULL; + } + + BIOSImage = (u8 *) BIOSImagePhys; + + /*Change the PCI BAR registers to map it onto the bus.*/ + pci_write_config_dword(pcidev, BIOSImageBAR, 0); + pci_write_config_dword(pcidev, PCI_ROM_ADDRESS, BIOSImagePhys | 0x1); + + udelay(1); + + /*Check that the BIOS image is valid. If not fail, or return the + compiled in BIOS image if that option was enabled + */ + if (BIOSImage[0] != 0x55 || BIOSImage[1] != 0xAA || BIOSImage[2] == 0) { + return NULL; + } + + return BIOSImage; +} + +/**************************************************************************** +PARAMETERS: +pcidev - PCI device info for the video card on the bus + +REMARKS: +Unmaps the BIOS image for the device and restores framebuffer mappings +****************************************************************************/ +void PCI_unmapBIOSImage(pci_dev_t pcidev, void *BIOSImage) +{ + pci_write_config_dword(pcidev, PCI_ROM_ADDRESS, saveROMBaseAddress); + pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_0, saveBaseAddress10); + pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_1, saveBaseAddress14); + pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_2, saveBaseAddress18); + pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_4, saveBaseAddress20); +} + +/**************************************************************************** +PARAMETERS: +pcidev - PCI device info for the video card on the bus to boot +VGAInfo - BIOS emulator VGA info structure + +RETURNS: +True if successfully initialised, false if not. + +REMARKS: +Loads and POST's the display controllers BIOS, directly from the BIOS +image we can extract over the PCI bus. +****************************************************************************/ +static int PCI_postController(pci_dev_t pcidev, BE_VGAInfo * VGAInfo) +{ + u32 BIOSImageLen; + uchar *mappedBIOS; + uchar *copyOfBIOS; + + /*Allocate memory to store copy of BIOS from display controller*/ + if ((mappedBIOS = PCI_mapBIOSImage(pcidev)) == NULL) { + printf("videoboot: Video ROM failed to map!\n"); + return false; + } + + BIOSImageLen = mappedBIOS[2] * 512; + + if ((copyOfBIOS = malloc(BIOSImageLen)) == NULL) { + printf("videoboot: Out of memory!\n"); + return false; + } + memcpy(copyOfBIOS, mappedBIOS, BIOSImageLen); + + PCI_unmapBIOSImage(pcidev, mappedBIOS); + + /*Save information in VGAInfo structure*/ + VGAInfo->function = PCI_FUNC(pcidev); + VGAInfo->device = PCI_DEV(pcidev); + VGAInfo->bus = PCI_BUS(pcidev); + VGAInfo->pcidev = pcidev; + VGAInfo->BIOSImage = copyOfBIOS; + VGAInfo->BIOSImageLen = BIOSImageLen; + + /*Now execute the BIOS POST for the device*/ + if (copyOfBIOS[0] != 0x55 || copyOfBIOS[1] != 0xAA) { + printf("videoboot: Video ROM image is invalid!\n"); + return false; + } + + PCI_doBIOSPOST(pcidev, VGAInfo); + + /*Reset the size of the BIOS image to the final size*/ + VGAInfo->BIOSImageLen = copyOfBIOS[2] * 512; + return true; +} + +/**************************************************************************** +PARAMETERS: +pcidev - PCI device info for the video card on the bus to boot +pVGAInfo - Place to return VGA info structure is requested +cleanUp - True to clean up on exit, false to leave emulator active + +REMARKS: +Boots the PCI/AGP video card on the bus using the Video ROM BIOS image +and the X86 BIOS emulator module. +****************************************************************************/ +int BootVideoCardBIOS(pci_dev_t pcidev, BE_VGAInfo ** pVGAInfo, int cleanUp) +{ + BE_VGAInfo *VGAInfo; + + printf("videoboot: Booting PCI video card bus %d, function %d, device %d\n", + PCI_BUS(pcidev), PCI_FUNC(pcidev), PCI_DEV(pcidev)); + + /*Initialise the x86 BIOS emulator*/ + if ((VGAInfo = malloc(sizeof(*VGAInfo))) == NULL) { + printf("videoboot: Out of memory!\n"); + return false; + } + memset(VGAInfo, 0, sizeof(*VGAInfo)); + BE_init(0, 65536, VGAInfo, 0); + + /*Post all the display controller BIOS'es*/ + PCI_postController(pcidev, VGAInfo); + + /*Cleanup and exit the emulator if requested. If the BIOS emulator + is needed after booting the card, we will not call BE_exit and + leave it enabled for further use (ie: VESA driver etc). + */ + if (cleanUp) { + BE_exit(); + if (VGAInfo->BIOSImage) + free(VGAInfo->BIOSImage); + free(VGAInfo); + VGAInfo = NULL; + } + /*Return VGA info pointer if the caller requested it*/ + if (pVGAInfo) + *pVGAInfo = VGAInfo; + return true; +} + +#endif |