1 /****************************************************************************
3 * Video BOOT Graphics Card POST Module
5 * ========================================================================
6 * Copyright (C) 2007 Freescale Semiconductor, Inc.
7 * Jason Jin <Jason.jin@freescale.com>
9 * Copyright (C) 1991-2004 SciTech Software, Inc. All rights reserved.
11 * This file may be distributed and/or modified under the terms of the
12 * GNU General Public License version 2.0 as published by the Free
13 * Software Foundation and appearing in the file LICENSE.GPL included
14 * in the packaging of this file.
16 * Licensees holding a valid Commercial License for this product from
17 * SciTech Software, Inc. may use this file in accordance with the
18 * Commercial License Agreement provided with the Software.
20 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
21 * THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * See http://www.scitechsoft.com/license/ for information about
25 * the licensing options available and how to purchase a Commercial
28 * Contact license@scitechsoft.com if any conditions of this licensing
29 * are not clear to you, or you have questions about licensing options.
31 * ========================================================================
34 * Environment: Linux Kernel
35 * Developer: Kendall Bennett
37 * Description: Module to implement booting PCI/AGP controllers on the
38 * bus. We use the x86 real mode emulator to run the BIOS on
39 * graphics controllers to bring the cards up.
41 * Note that at present this module does *not* support
42 * multiple controllers.
44 * The orignal name of this file is warmboot.c.
45 * Jason ported this file to u-boot to run the ATI video card
47 ****************************************************************************/
52 /* Length of the BIOS image */
53 #define MAX_BIOSLEN (128 * 1024L)
55 /* Place to save PCI BAR's that we change and later restore */
56 static u32 saveROMBaseAddress;
57 static u32 saveBaseAddress10;
58 static u32 saveBaseAddress14;
59 static u32 saveBaseAddress18;
60 static u32 saveBaseAddress20;
62 /****************************************************************************
64 pcidev - PCI device info for the video card on the bus to boot
65 VGAInfo - BIOS emulator VGA info structure
68 This function executes the BIOS POST code on the controller. We assume that
69 at this stage the controller has its I/O and memory space enabled and
70 that all other controllers are in a disabled state.
71 ****************************************************************************/
72 static void PCI_doBIOSPOST(pci_dev_t pcidev, BE_VGAInfo * VGAInfo)
77 /* Determine the value to store in AX for BIOS POST. Per the PCI specs,
78 AH must contain the bus and AL must contain the devfn, encoded as
81 memset(®s, 0, sizeof(regs));
82 memset(&sregs, 0, sizeof(sregs));
83 regs.x.ax = ((int)PCI_BUS(pcidev) << 8) |
84 ((int)PCI_DEV(pcidev) << 3) | (int)PCI_FUNC(pcidev);
86 /*Setup the X86 emulator for the VGA BIOS*/
89 /*Execute the BIOS POST code*/
90 BE_callRealMode(0xC000, 0x0003, ®s, &sregs);
96 /****************************************************************************
98 pcidev - PCI device info for the video card on the bus
99 bar - Place to return the base address register offset to use
102 The address to use to map the secondary BIOS (AGP devices)
105 Searches all the PCI base address registers for the device looking for a
106 memory mapping that is large enough to hold our ROM BIOS. We usually end up
107 finding the framebuffer mapping (usually BAR 0x10), and we use this mapping
108 to map the BIOS for the device into. We use a mapping that is already
109 assigned to the device to ensure the memory range will be passed through
110 by any PCI->PCI or AGP->PCI bridge that may be present.
112 NOTE: Usually this function is only used for AGP devices, but it may be
113 used for PCI devices that have already been POST'ed and the BIOS
114 ROM base address has been zero'ed out.
116 NOTE: This function leaves the original memory aperture disabled by leaving
117 it programmed to all 1's. It must be restored to the correct value
119 ****************************************************************************/
120 static u32 PCI_findBIOSAddr(pci_dev_t pcidev, int *bar)
124 for (*bar = 0x10; *bar <= 0x14; (*bar) += 4) {
125 pci_read_config_dword(pcidev, *bar, &base);
127 pci_write_config_dword(pcidev, *bar, 0xFFFFFFFF);
128 pci_read_config_dword(pcidev, *bar, &size);
129 size = ~(size & ~0xFF) + 1;
130 if (size >= MAX_BIOSLEN)
137 /****************************************************************************
139 Some non-x86 Linux kernels map PCI relocateable I/O to values that
140 are above 64K, which will not work with the BIOS image that requires
141 the offset for the I/O ports to be a maximum of 16-bits. Ideally
142 someone should fix the kernel to map the I/O ports for VGA compatible
143 devices to a different location (or just all I/O ports since it is
144 unlikely you can have enough devices in the machine to use up all
145 64K of the I/O space - a total of more than 256 cards would be
148 Anyway to fix this we change all I/O mapped base registers and
149 chop off the top bits.
150 ****************************************************************************/
151 static void PCI_fixupIObase(pci_dev_t pcidev, int reg, u32 * base)
153 if ((*base & 0x1) && (*base > 0xFFFE)) {
155 pci_write_config_dword(pcidev, reg, *base);
160 /****************************************************************************
162 pcidev - PCI device info for the video card on the bus
165 Pointers to the mapped BIOS image
168 Maps a pointer to the BIOS image on the graphics card on the PCI bus.
169 ****************************************************************************/
170 void *PCI_mapBIOSImage(pci_dev_t pcidev)
176 /*Save PCI BAR registers that might get changed*/
177 pci_read_config_dword(pcidev, PCI_ROM_ADDRESS, &saveROMBaseAddress);
178 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_0, &saveBaseAddress10);
179 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_1, &saveBaseAddress14);
180 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_2, &saveBaseAddress18);
181 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_4, &saveBaseAddress20);
183 /*Fix up I/O base registers to less than 64K */
184 if(saveBaseAddress14 != 0)
185 PCI_fixupIObase(pcidev, PCI_BASE_ADDRESS_1, &saveBaseAddress14);
187 PCI_fixupIObase(pcidev, PCI_BASE_ADDRESS_4, &saveBaseAddress20);
189 /* Some cards have problems that stop us from being able to read the
190 BIOS image from the ROM BAR. To fix this we have to do some chipset
191 specific programming for different cards to solve this problem.
194 BIOSImageBus = PCI_findBIOSAddr(pcidev, &BIOSImageBAR);
195 if (BIOSImageBus == 0) {
196 printf("Find bios addr error\n");
200 BIOSImage = pci_bus_to_virt(pcidev, BIOSImageBus,
201 PCI_REGION_MEM, 0, MAP_NOCACHE);
203 /*Change the PCI BAR registers to map it onto the bus.*/
204 pci_write_config_dword(pcidev, BIOSImageBAR, 0);
205 pci_write_config_dword(pcidev, PCI_ROM_ADDRESS, BIOSImageBus | 0x1);
209 /*Check that the BIOS image is valid. If not fail, or return the
210 compiled in BIOS image if that option was enabled
212 if (BIOSImage[0] != 0x55 || BIOSImage[1] != 0xAA || BIOSImage[2] == 0) {
219 /****************************************************************************
221 pcidev - PCI device info for the video card on the bus
224 Unmaps the BIOS image for the device and restores framebuffer mappings
225 ****************************************************************************/
226 void PCI_unmapBIOSImage(pci_dev_t pcidev, void *BIOSImage)
228 pci_write_config_dword(pcidev, PCI_ROM_ADDRESS, saveROMBaseAddress);
229 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_0, saveBaseAddress10);
230 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_1, saveBaseAddress14);
231 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_2, saveBaseAddress18);
232 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_4, saveBaseAddress20);
235 /****************************************************************************
237 pcidev - PCI device info for the video card on the bus to boot
238 VGAInfo - BIOS emulator VGA info structure
241 true if successfully initialised, false if not.
244 Loads and POST's the display controllers BIOS, directly from the BIOS
245 image we can extract over the PCI bus.
246 ****************************************************************************/
247 static int PCI_postController(pci_dev_t pcidev, BE_VGAInfo * VGAInfo)
253 /*Allocate memory to store copy of BIOS from display controller*/
254 if ((mappedBIOS = PCI_mapBIOSImage(pcidev)) == NULL) {
255 printf("videoboot: Video ROM failed to map!\n");
259 BIOSImageLen = mappedBIOS[2] * 512;
261 if ((copyOfBIOS = malloc(BIOSImageLen)) == NULL) {
262 printf("videoboot: Out of memory!\n");
265 memcpy(copyOfBIOS, mappedBIOS, BIOSImageLen);
267 PCI_unmapBIOSImage(pcidev, mappedBIOS);
269 /*Save information in VGAInfo structure*/
270 VGAInfo->function = PCI_FUNC(pcidev);
271 VGAInfo->device = PCI_DEV(pcidev);
272 VGAInfo->bus = PCI_BUS(pcidev);
273 VGAInfo->pcidev = pcidev;
274 VGAInfo->BIOSImage = copyOfBIOS;
275 VGAInfo->BIOSImageLen = BIOSImageLen;
277 /*Now execute the BIOS POST for the device*/
278 if (copyOfBIOS[0] != 0x55 || copyOfBIOS[1] != 0xAA) {
279 printf("videoboot: Video ROM image is invalid!\n");
283 PCI_doBIOSPOST(pcidev, VGAInfo);
285 /*Reset the size of the BIOS image to the final size*/
286 VGAInfo->BIOSImageLen = copyOfBIOS[2] * 512;
290 /****************************************************************************
292 pcidev - PCI device info for the video card on the bus to boot
293 pVGAInfo - Place to return VGA info structure is requested
294 cleanUp - true to clean up on exit, false to leave emulator active
297 Boots the PCI/AGP video card on the bus using the Video ROM BIOS image
298 and the X86 BIOS emulator module.
299 ****************************************************************************/
300 int BootVideoCardBIOS(pci_dev_t pcidev, BE_VGAInfo ** pVGAInfo, int cleanUp)
304 printf("videoboot: Booting PCI video card bus %d, function %d, device %d\n",
305 PCI_BUS(pcidev), PCI_FUNC(pcidev), PCI_DEV(pcidev));
307 /*Initialise the x86 BIOS emulator*/
308 if ((VGAInfo = malloc(sizeof(*VGAInfo))) == NULL) {
309 printf("videoboot: Out of memory!\n");
312 memset(VGAInfo, 0, sizeof(*VGAInfo));
313 BE_init(0, 65536, VGAInfo, 0);
315 /*Post all the display controller BIOS'es*/
316 if (!PCI_postController(pcidev, VGAInfo))
319 /*Cleanup and exit the emulator if requested. If the BIOS emulator
320 is needed after booting the card, we will not call BE_exit and
321 leave it enabled for further use (ie: VESA driver etc).
325 if (VGAInfo->BIOSImage)
326 free(VGAInfo->BIOSImage);
330 /*Return VGA info pointer if the caller requested it*/