Supports qemu emulated ati cards.  They have been added in qemu 4.0.
Acceleration support (in qemu) is pretty rough still.  A simple
framebuffer works fine though.

Available models:
 * ati rage 128 pro
 * ati rv100

Note: The ati_regs.h file is just copyed over from qemu.

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 Makefile          |   2 +-
 vgasrc/ati_regs.h | 455 ++++++++++++++++++++++++++++++++++++++++++++++
 vgasrc/vgahw.h    |   8 +
 vgasrc/vgautil.h  |   6 +
 vgasrc/atiext.c   | 221 ++++++++++++++++++++++
 vgasrc/Kconfig    |  11 ++
 6 files changed, 702 insertions(+), 1 deletion(-)
 create mode 100644 vgasrc/ati_regs.h
 create mode 100644 vgasrc/atiext.c

diff --git a/Makefile b/Makefile
index 3aecc4df743b..d16d1ae7a300 100644
--- a/Makefile
+++ b/Makefile
@@ -212,7 +212,7 @@ SRCVGA=src/output.c src/string.c src/hw/pci.c 
src/hw/serialio.c \
     vgasrc/vgainit.c vgasrc/vgabios.c vgasrc/vgafb.c vgasrc/swcursor.c \
     vgasrc/vgafonts.c vgasrc/vbe.c \
     vgasrc/stdvga.c vgasrc/stdvgamodes.c vgasrc/stdvgaio.c \
-    vgasrc/clext.c vgasrc/svgamodes.c vgasrc/bochsvga.c vgasrc/geodevga.c \
+    vgasrc/clext.c vgasrc/svgamodes.c vgasrc/atiext.c vgasrc/bochsvga.c 
vgasrc/geodevga.c \
     src/fw/coreboot.c vgasrc/cbvga.c vgasrc/bochsdisplay.c vgasrc/ramfb.c
 
 ifeq "$(CONFIG_VGA_FIXUP_ASM)" "y"
diff --git a/vgasrc/ati_regs.h b/vgasrc/ati_regs.h
new file mode 100644
index 000000000000..589f58965cdf
--- /dev/null
+++ b/vgasrc/ati_regs.h
@@ -0,0 +1,455 @@
+/*
+ * ATI VGA register definitions
+ *
+ * based on:
+ * linux/include/video/aty128.h
+ *     Register definitions for ATI Rage128 boards
+ *     Anthony Tong <at...@uiuc.edu>, 1999
+ *     Brad Douglas <b...@neruo.com>, 2000
+ *
+ * and linux/include/video/radeon.h
+ *
+ * This work is licensed under the GNU GPL license version 2.
+ */
+
+/*
+ * Register mapping:
+ * 0x0000-0x00ff Misc regs also accessible via io and mmio space
+ * 0x0100-0x0eff Misc regs only accessible via mmio
+ * 0x0f00-0x0fff Read-only copy of PCI config regs
+ * 0x1000-0x13ff Concurrent Command Engine (CCE) regs
+ * 0x1400-0x1fff GUI (drawing engine) regs
+ */
+
+#ifndef ATI_REGS_H
+#define ATI_REGS_H
+
+#define MM_INDEX                                0x0000
+#define MM_DATA                                 0x0004
+#define CLOCK_CNTL_INDEX                        0x0008
+#define CLOCK_CNTL_DATA                         0x000c
+#define BIOS_0_SCRATCH                          0x0010
+#define BUS_CNTL                                0x0030
+#define BUS_CNTL1                               0x0034
+#define GEN_INT_CNTL                            0x0040
+#define CRTC_GEN_CNTL                           0x0050
+#define CRTC_EXT_CNTL                           0x0054
+#define DAC_CNTL                                0x0058
+#define GPIO_MONID                              0x0068
+#define I2C_CNTL_1                              0x0094
+#define PALETTE_INDEX                           0x00b0
+#define PALETTE_DATA                            0x00b4
+#define CNFG_CNTL                               0x00e0
+#define GEN_RESET_CNTL                          0x00f0
+#define CNFG_MEMSIZE                            0x00f8
+#define MEM_CNTL                                0x0140
+#define MC_FB_LOCATION                          0x0148
+#define MC_AGP_LOCATION                         0x014C
+#define MC_STATUS                               0x0150
+#define MEM_POWER_MISC                          0x015c
+#define AGP_BASE                                0x0170
+#define AGP_CNTL                                0x0174
+#define AGP_APER_OFFSET                         0x0178
+#define PCI_GART_PAGE                           0x017c
+#define PC_NGUI_MODE                            0x0180
+#define PC_NGUI_CTLSTAT                         0x0184
+#define MPP_TB_CONFIG                           0x01C0
+#define MPP_GP_CONFIG                           0x01C8
+#define VIPH_CONTROL                            0x01D0
+#define CRTC_H_TOTAL_DISP                       0x0200
+#define CRTC_H_SYNC_STRT_WID                    0x0204
+#define CRTC_V_TOTAL_DISP                       0x0208
+#define CRTC_V_SYNC_STRT_WID                    0x020c
+#define CRTC_VLINE_CRNT_VLINE                   0x0210
+#define CRTC_CRNT_FRAME                         0x0214
+#define CRTC_GUI_TRIG_VLINE                     0x0218
+#define CRTC_OFFSET                             0x0224
+#define CRTC_OFFSET_CNTL                        0x0228
+#define CRTC_PITCH                              0x022c
+#define OVR_CLR                                 0x0230
+#define OVR_WID_LEFT_RIGHT                      0x0234
+#define OVR_WID_TOP_BOTTOM                      0x0238
+#define LVDS_GEN_CNTL                           0x02d0
+#define DDA_CONFIG                              0x02e0
+#define DDA_ON_OFF                              0x02e4
+#define VGA_DDA_CONFIG                          0x02e8
+#define VGA_DDA_ON_OFF                          0x02ec
+#define CRTC2_H_TOTAL_DISP                      0x0300
+#define CRTC2_H_SYNC_STRT_WID                   0x0304
+#define CRTC2_V_TOTAL_DISP                      0x0308
+#define CRTC2_V_SYNC_STRT_WID                   0x030c
+#define CRTC2_VLINE_CRNT_VLINE                  0x0310
+#define CRTC2_CRNT_FRAME                        0x0314
+#define CRTC2_GUI_TRIG_VLINE                    0x0318
+#define CRTC2_OFFSET                            0x0324
+#define CRTC2_OFFSET_CNTL                       0x0328
+#define CRTC2_PITCH                             0x032c
+#define DDA2_CONFIG                             0x03e0
+#define DDA2_ON_OFF                             0x03e4
+#define CRTC2_GEN_CNTL                          0x03f8
+#define CRTC2_STATUS                            0x03fc
+#define OV0_SCALE_CNTL                          0x0420
+#define SUBPIC_CNTL                             0x0540
+#define PM4_BUFFER_OFFSET                       0x0700
+#define PM4_BUFFER_CNTL                         0x0704
+#define PM4_BUFFER_WM_CNTL                      0x0708
+#define PM4_BUFFER_DL_RPTR_ADDR                 0x070c
+#define PM4_BUFFER_DL_RPTR                      0x0710
+#define PM4_BUFFER_DL_WPTR                      0x0714
+#define PM4_VC_FPU_SETUP                        0x071c
+#define PM4_FPU_CNTL                            0x0720
+#define PM4_VC_FORMAT                           0x0724
+#define PM4_VC_CNTL                             0x0728
+#define PM4_VC_I01                              0x072c
+#define PM4_VC_VLOFF                            0x0730
+#define PM4_VC_VLSIZE                           0x0734
+#define PM4_IW_INDOFF                           0x0738
+#define PM4_IW_INDSIZE                          0x073c
+#define PM4_FPU_FPX0                            0x0740
+#define PM4_FPU_FPY0                            0x0744
+#define PM4_FPU_FPX1                            0x0748
+#define PM4_FPU_FPY1                            0x074c
+#define PM4_FPU_FPX2                            0x0750
+#define PM4_FPU_FPY2                            0x0754
+#define PM4_FPU_FPY3                            0x0758
+#define PM4_FPU_FPY4                            0x075c
+#define PM4_FPU_FPY5                            0x0760
+#define PM4_FPU_FPY6                            0x0764
+#define PM4_FPU_FPR                             0x0768
+#define PM4_FPU_FPG                             0x076c
+#define PM4_FPU_FPB                             0x0770
+#define PM4_FPU_FPA                             0x0774
+#define PM4_FPU_INTXY0                          0x0780
+#define PM4_FPU_INTXY1                          0x0784
+#define PM4_FPU_INTXY2                          0x0788
+#define PM4_FPU_INTARGB                         0x078c
+#define PM4_FPU_FPTWICEAREA                     0x0790
+#define PM4_FPU_DMAJOR01                        0x0794
+#define PM4_FPU_DMAJOR12                        0x0798
+#define PM4_FPU_DMAJOR02                        0x079c
+#define PM4_FPU_STAT                            0x07a0
+#define PM4_STAT                                0x07b8
+#define PM4_TEST_CNTL                           0x07d0
+#define PM4_MICROCODE_ADDR                      0x07d4
+#define PM4_MICROCODE_RADDR                     0x07d8
+#define PM4_MICROCODE_DATAH                     0x07dc
+#define PM4_MICROCODE_DATAL                     0x07e0
+#define PM4_CMDFIFO_ADDR                        0x07e4
+#define PM4_CMDFIFO_DATAH                       0x07e8
+#define PM4_CMDFIFO_DATAL                       0x07ec
+#define PM4_BUFFER_ADDR                         0x07f0
+#define PM4_BUFFER_DATAH                        0x07f4
+#define PM4_BUFFER_DATAL                        0x07f8
+#define PM4_MICRO_CNTL                          0x07fc
+#define CAP0_TRIG_CNTL                          0x0950
+#define CAP1_TRIG_CNTL                          0x09c0
+
+#define RBBM_STATUS                             0x0e40
+
+/*
+ * GUI Block Memory Mapped Registers
+ * These registers are FIFOed.
+ */
+#define PM4_FIFO_DATA_EVEN                      0x1000
+#define PM4_FIFO_DATA_ODD                       0x1004
+
+#define DST_OFFSET                              0x1404
+#define DST_PITCH                               0x1408
+#define DST_WIDTH                               0x140c
+#define DST_HEIGHT                              0x1410
+#define SRC_X                                   0x1414
+#define SRC_Y                                   0x1418
+#define DST_X                                   0x141c
+#define DST_Y                                   0x1420
+#define SRC_PITCH_OFFSET                        0x1428
+#define DST_PITCH_OFFSET                        0x142c
+#define SRC_Y_X                                 0x1434
+#define DST_Y_X                                 0x1438
+#define DST_HEIGHT_WIDTH                        0x143c
+#define DP_GUI_MASTER_CNTL                      0x146c
+#define BRUSH_SCALE                             0x1470
+#define BRUSH_Y_X                               0x1474
+#define DP_BRUSH_BKGD_CLR                       0x1478
+#define DP_BRUSH_FRGD_CLR                       0x147c
+#define DST_WIDTH_X                             0x1588
+#define DST_HEIGHT_WIDTH_8                      0x158c
+#define SRC_X_Y                                 0x1590
+#define DST_X_Y                                 0x1594
+#define DST_WIDTH_HEIGHT                        0x1598
+#define DST_WIDTH_X_INCY                        0x159c
+#define DST_HEIGHT_Y                            0x15a0
+#define DST_X_SUB                               0x15a4
+#define DST_Y_SUB                               0x15a8
+#define SRC_OFFSET                              0x15ac
+#define SRC_PITCH                               0x15b0
+#define DST_HEIGHT_WIDTH_BW                     0x15b4
+#define CLR_CMP_CNTL                            0x15c0
+#define CLR_CMP_CLR_SRC                         0x15c4
+#define CLR_CMP_CLR_DST                         0x15c8
+#define CLR_CMP_MASK                            0x15cc
+#define DP_SRC_FRGD_CLR                         0x15d8
+#define DP_SRC_BKGD_CLR                         0x15dc
+#define DST_BRES_ERR                            0x1628
+#define DST_BRES_INC                            0x162c
+#define DST_BRES_DEC                            0x1630
+#define DST_BRES_LNTH                           0x1634
+#define DST_BRES_LNTH_SUB                       0x1638
+#define SC_LEFT                                 0x1640
+#define SC_RIGHT                                0x1644
+#define SC_TOP                                  0x1648
+#define SC_BOTTOM                               0x164c
+#define SRC_SC_RIGHT                            0x1654
+#define SRC_SC_BOTTOM                           0x165c
+#define GUI_DEBUG0                              0x16a0
+#define GUI_DEBUG1                              0x16a4
+#define GUI_TIMEOUT                             0x16b0
+#define GUI_TIMEOUT0                            0x16b4
+#define GUI_TIMEOUT1                            0x16b8
+#define GUI_PROBE                               0x16bc
+#define DP_CNTL                                 0x16c0
+#define DP_DATATYPE                             0x16c4
+#define DP_MIX                                  0x16c8
+#define DP_WRITE_MASK                           0x16cc
+#define DP_CNTL_XDIR_YDIR_YMAJOR                0x16d0
+#define DEFAULT_OFFSET                          0x16e0
+#undef DEFAULT_PITCH /* needed for mingw builds */
+#define DEFAULT_PITCH                           0x16e4
+#define DEFAULT_SC_BOTTOM_RIGHT                 0x16e8
+#define SC_TOP_LEFT                             0x16ec
+#define SC_BOTTOM_RIGHT                         0x16f0
+#define SRC_SC_BOTTOM_RIGHT                     0x16f4
+#define DST_TILE                                0x1700
+#define WAIT_UNTIL                              0x1720
+#define CACHE_CNTL                              0x1724
+#define GUI_STAT                                0x1740
+#define PC_GUI_MODE                             0x1744
+#define PC_GUI_CTLSTAT                          0x1748
+#define PC_DEBUG_MODE                           0x1760
+#define BRES_DST_ERR_DEC                        0x1780
+#define TRAIL_BRES_T12_ERR_DEC                  0x1784
+#define TRAIL_BRES_T12_INC                      0x1788
+#define DP_T12_CNTL                             0x178c
+#define DST_BRES_T1_LNTH                        0x1790
+#define DST_BRES_T2_LNTH                        0x1794
+#define SCALE_SRC_HEIGHT_WIDTH                  0x1994
+#define SCALE_OFFSET_0                          0x1998
+#define SCALE_PITCH                             0x199c
+#define SCALE_X_INC                             0x19a0
+#define SCALE_Y_INC                             0x19a4
+#define SCALE_HACC                              0x19a8
+#define SCALE_VACC                              0x19ac
+#define SCALE_DST_X_Y                           0x19b0
+#define SCALE_DST_HEIGHT_WIDTH                  0x19b4
+#define SCALE_3D_CNTL                           0x1a00
+#define SCALE_3D_DATATYPE                       0x1a20
+#define SETUP_CNTL                              0x1bc4
+#define SOLID_COLOR                             0x1bc8
+#define WINDOW_XY_OFFSET                        0x1bcc
+#define DRAW_LINE_POINT                         0x1bd0
+#define SETUP_CNTL_PM4                          0x1bd4
+#define DST_PITCH_OFFSET_C                      0x1c80
+#define DP_GUI_MASTER_CNTL_C                    0x1c84
+#define SC_TOP_LEFT_C                           0x1c88
+#define SC_BOTTOM_RIGHT_C                       0x1c8c
+
+#define CLR_CMP_MASK_3D                         0x1A28
+#define MISC_3D_STATE_CNTL_REG                  0x1CA0
+#define MC_SRC1_CNTL                            0x19D8
+#define TEX_CNTL                                0x1800
+
+/* CONSTANTS */
+#define GUI_ACTIVE                              0x80000000
+#define ENGINE_IDLE                             0x0
+
+#define PLL_WR_EN                               0x00000080
+
+#define CLK_PIN_CNTL                            0x01
+#define PPLL_CNTL                               0x02
+#define PPLL_REF_DIV                            0x03
+#define PPLL_DIV_0                              0x04
+#define PPLL_DIV_1                              0x05
+#define PPLL_DIV_2                              0x06
+#define PPLL_DIV_3                              0x07
+#define VCLK_ECP_CNTL                           0x08
+#define HTOTAL_CNTL                             0x09
+#define X_MPLL_REF_FB_DIV                       0x0a
+#define XPLL_CNTL                               0x0b
+#define XDLL_CNTL                               0x0c
+#define XCLK_CNTL                               0x0d
+#define MPLL_CNTL                               0x0e
+#define MCLK_CNTL                               0x0f
+#define AGP_PLL_CNTL                            0x10
+#define FCP_CNTL                                0x12
+#define PLL_TEST_CNTL                           0x13
+#define P2PLL_CNTL                              0x2a
+#define P2PLL_REF_DIV                           0x2b
+#define P2PLL_DIV_0                             0x2b
+#define POWER_MANAGEMENT                        0x2f
+
+#define PPLL_RESET                              0x00000001
+#define PPLL_ATOMIC_UPDATE_EN                   0x00010000
+#define PPLL_VGA_ATOMIC_UPDATE_EN               0x00020000
+#define PPLL_REF_DIV_MASK                       0x000003FF
+#define PPLL_FB3_DIV_MASK                       0x000007FF
+#define PPLL_POST3_DIV_MASK                     0x00070000
+#define PPLL_ATOMIC_UPDATE_R                    0x00008000
+#define PPLL_ATOMIC_UPDATE_W                    0x00008000
+#define MEM_CFG_TYPE_MASK                       0x00000003
+#define XCLK_SRC_SEL_MASK                       0x00000007
+#define XPLL_FB_DIV_MASK                        0x0000FF00
+#define X_MPLL_REF_DIV_MASK                     0x000000FF
+
+/* Config control values (CONFIG_CNTL) */
+#define CFG_VGA_IO_DIS                          0x00000400
+
+/* CRTC control values (CRTC_GEN_CNTL) */
+#define CRTC_CSYNC_EN                           0x00000010
+
+#define CRTC2_DBL_SCAN_EN                       0x00000001
+#define CRTC2_DISPLAY_DIS                       0x00800000
+#define CRTC2_FIFO_EXTSENSE                     0x00200000
+#define CRTC2_ICON_EN                           0x00100000
+#define CRTC2_CUR_EN                            0x00010000
+#define CRTC2_EXT_DISP_EN                       0x01000000
+#define CRTC2_EN                                0x02000000
+#define CRTC2_DISP_REQ_EN_B                     0x04000000
+
+#define CRTC_PIX_WIDTH_MASK                     0x00000700
+#define CRTC_PIX_WIDTH_4BPP                     0x00000100
+#define CRTC_PIX_WIDTH_8BPP                     0x00000200
+#define CRTC_PIX_WIDTH_15BPP                    0x00000300
+#define CRTC_PIX_WIDTH_16BPP                    0x00000400
+#define CRTC_PIX_WIDTH_24BPP                    0x00000500
+#define CRTC_PIX_WIDTH_32BPP                    0x00000600
+
+/* DAC_CNTL bit constants */
+#define DAC_8BIT_EN                             0x00000100
+#define DAC_MASK                                0xFF000000
+#define DAC_BLANKING                            0x00000004
+#define DAC_RANGE_CNTL                          0x00000003
+#define DAC_CLK_SEL                             0x00000010
+#define DAC_PALETTE_ACCESS_CNTL                 0x00000020
+#define DAC_PALETTE2_SNOOP_EN                   0x00000040
+#define DAC_PDWN                                0x00008000
+
+/* CRTC_EXT_CNTL */
+#define CRT_CRTC_DISPLAY_DIS                    0x00000400
+#define CRT_CRTC_ON                             0x00008000
+
+/* GEN_RESET_CNTL bit constants */
+#define SOFT_RESET_GUI                          0x00000001
+#define SOFT_RESET_VCLK                         0x00000100
+#define SOFT_RESET_PCLK                         0x00000200
+#define SOFT_RESET_ECP                          0x00000400
+#define SOFT_RESET_DISPENG_XCLK                 0x00000800
+
+/* PC_GUI_CTLSTAT bit constants */
+#define PC_BUSY_INIT                            0x10000000
+#define PC_BUSY_GUI                             0x20000000
+#define PC_BUSY_NGUI                            0x40000000
+#define PC_BUSY                                 0x80000000
+
+#define BUS_MASTER_DIS                          0x00000040
+#define PM4_BUFFER_CNTL_NONPM4                  0x00000000
+
+/* DP_DATATYPE bit constants */
+#define DST_8BPP                                0x00000002
+#define DST_15BPP                               0x00000003
+#define DST_16BPP                               0x00000004
+#define DST_24BPP                               0x00000005
+#define DST_32BPP                               0x00000006
+
+#define BRUSH_SOLIDCOLOR                        0x00000d00
+
+/* DP_GUI_MASTER_CNTL bit constants */
+#define GMC_SRC_PITCH_OFFSET_DEFAULT            0x00000000
+#define GMC_DST_PITCH_OFFSET_DEFAULT            0x00000000
+#define GMC_SRC_CLIP_DEFAULT                    0x00000000
+#define GMC_DST_CLIP_DEFAULT                    0x00000000
+#define GMC_BRUSH_SOLIDCOLOR                    0x000000d0
+#define GMC_SRC_DSTCOLOR                        0x00003000
+#define GMC_BYTE_ORDER_MSB_TO_LSB               0x00000000
+#define GMC_DP_SRC_RECT                         0x02000000
+#define GMC_3D_FCN_EN_CLR                       0x00000000
+#define GMC_AUX_CLIP_CLEAR                      0x20000000
+#define GMC_DST_CLR_CMP_FCN_CLEAR               0x10000000
+#define GMC_WRITE_MASK_SET                      0x40000000
+#define GMC_DP_CONVERSION_TEMP_6500             0x00000000
+
+/* DP_GUI_MASTER_CNTL ROP3 named constants */
+#define GMC_ROP3_MASK                           0x00ff0000
+#define ROP3_BLACKNESS                          0x00000000
+#define ROP3_SRCCOPY                            0x00cc0000
+#define ROP3_PATCOPY                            0x00f00000
+#define ROP3_WHITENESS                          0x00ff0000
+
+#define SRC_DSTCOLOR                            0x00030000
+
+/* DP_CNTL bit constants */
+#define DST_X_RIGHT_TO_LEFT                     0x00000000
+#define DST_X_LEFT_TO_RIGHT                     0x00000001
+#define DST_Y_BOTTOM_TO_TOP                     0x00000000
+#define DST_Y_TOP_TO_BOTTOM                     0x00000002
+#define DST_X_MAJOR                             0x00000000
+#define DST_Y_MAJOR                             0x00000004
+#define DST_X_TILE                              0x00000008
+#define DST_Y_TILE                              0x00000010
+#define DST_LAST_PEL                            0x00000020
+#define DST_TRAIL_X_RIGHT_TO_LEFT               0x00000000
+#define DST_TRAIL_X_LEFT_TO_RIGHT               0x00000040
+#define DST_TRAP_FILL_RIGHT_TO_LEFT             0x00000000
+#define DST_TRAP_FILL_LEFT_TO_RIGHT             0x00000080
+#define DST_BRES_SIGN                           0x00000100
+#define DST_HOST_BIG_ENDIAN_EN                  0x00000200
+#define DST_POLYLINE_NONLAST                    0x00008000
+#define DST_RASTER_STALL                        0x00010000
+#define DST_POLY_EDGE                           0x00040000
+
+/* DP_MIX bit constants */
+#define DP_SRC_RECT                             0x00000200
+#define DP_SRC_HOST                             0x00000300
+#define DP_SRC_HOST_BYTEALIGN                   0x00000400
+
+/* LVDS_GEN_CNTL constants */
+#define LVDS_BL_MOD_LEVEL_MASK                  0x0000ff00
+#define LVDS_BL_MOD_LEVEL_SHIFT                 8
+#define LVDS_BL_MOD_EN                          0x00010000
+#define LVDS_DIGION                             0x00040000
+#define LVDS_BLON                               0x00080000
+#define LVDS_ON                                 0x00000001
+#define LVDS_DISPLAY_DIS                        0x00000002
+#define LVDS_PANEL_TYPE_2PIX_PER_CLK            0x00000004
+#define LVDS_PANEL_24BITS_TFT                   0x00000008
+#define LVDS_FRAME_MOD_NO                       0x00000000
+#define LVDS_FRAME_MOD_2_LEVELS                 0x00000010
+#define LVDS_FRAME_MOD_4_LEVELS                 0x00000020
+#define LVDS_RST_FM                             0x00000040
+#define LVDS_EN                                 0x00000080
+
+/* CRTC2_GEN_CNTL constants */
+#define CRTC2_EN                                0x02000000
+
+/* POWER_MANAGEMENT constants */
+#define PWR_MGT_ON                              0x00000001
+#define PWR_MGT_MODE_MASK                       0x00000006
+#define PWR_MGT_MODE_PIN                        0x00000000
+#define PWR_MGT_MODE_REGISTER                   0x00000002
+#define PWR_MGT_MODE_TIMER                      0x00000004
+#define PWR_MGT_MODE_PCI                        0x00000006
+#define PWR_MGT_AUTO_PWR_UP_EN                  0x00000008
+#define PWR_MGT_ACTIVITY_PIN_ON                 0x00000010
+#define PWR_MGT_STANDBY_POL                     0x00000020
+#define PWR_MGT_SUSPEND_POL                     0x00000040
+#define PWR_MGT_SELF_REFRESH                    0x00000080
+#define PWR_MGT_ACTIVITY_PIN_EN                 0x00000100
+#define PWR_MGT_KEYBD_SNOOP                     0x00000200
+#define PWR_MGT_TRISTATE_MEM_EN                 0x00000800
+#define PWR_MGT_SELW4MS                         0x00001000
+#define PWR_MGT_SLOWDOWN_MCLK                   0x00002000
+
+#define PMI_PMSCR_REG                           0x60
+
+/* used by ATI bug fix for hardware ROM */
+#define RAGE128_MPP_TB_CONFIG                   0x01c0
+
+#endif /* ATI_REGS_H */
diff --git a/vgasrc/vgahw.h b/vgasrc/vgahw.h
index 51777458da62..c774f4f2c6b7 100644
--- a/vgasrc/vgahw.h
+++ b/vgasrc/vgahw.h
@@ -12,6 +12,8 @@
 static inline struct vgamode_s *vgahw_find_mode(int mode) {
     if (CONFIG_VGA_CIRRUS)
         return clext_find_mode(mode);
+    if (CONFIG_VGA_ATI)
+        return ati_find_mode(mode);
     if (CONFIG_VGA_BOCHS)
         return bochsvga_find_mode(mode);
     if (CONFIG_VGA_EMULATE_TEXT)
@@ -22,6 +24,8 @@ static inline struct vgamode_s *vgahw_find_mode(int mode) {
 static inline int vgahw_set_mode(struct vgamode_s *vmode_g, int flags) {
     if (CONFIG_VGA_CIRRUS)
         return clext_set_mode(vmode_g, flags);
+    if (CONFIG_VGA_ATI)
+        return ati_set_mode(vmode_g, flags);
     if (CONFIG_VGA_BOCHS)
         return bochsvga_set_mode(vmode_g, flags);
     if (CONFIG_VGA_EMULATE_TEXT)
@@ -32,6 +36,8 @@ static inline int vgahw_set_mode(struct vgamode_s *vmode_g, 
int flags) {
 static inline void vgahw_list_modes(u16 seg, u16 *dest, u16 *last) {
     if (CONFIG_VGA_CIRRUS)
         clext_list_modes(seg, dest, last);
+    if (CONFIG_VGA_ATI)
+        ati_list_modes(seg, dest, last);
     else if (CONFIG_VGA_BOCHS)
         bochsvga_list_modes(seg, dest, last);
     else if (CONFIG_VGA_EMULATE_TEXT)
@@ -43,6 +49,8 @@ static inline void vgahw_list_modes(u16 seg, u16 *dest, u16 
*last) {
 static inline int vgahw_setup(void) {
     if (CONFIG_VGA_CIRRUS)
         return clext_setup();
+    if (CONFIG_VGA_ATI)
+        return ati_setup();
     if (CONFIG_VGA_BOCHS)
         return bochsvga_setup();
     if (CONFIG_VGA_GEODEGX2 || CONFIG_VGA_GEODELX)
diff --git a/vgasrc/vgautil.h b/vgasrc/vgautil.h
index 4f37bf947c42..a9940402e45b 100644
--- a/vgasrc/vgautil.h
+++ b/vgasrc/vgautil.h
@@ -42,6 +42,12 @@ struct bregs;
 void clext_1012(struct bregs *regs);
 int clext_setup(void);
 
+// atiext.c
+struct vgamode_s *ati_find_mode(int mode);
+void ati_list_modes(u16 seg, u16 *dest, u16 *last);
+int ati_set_mode(struct vgamode_s *vmode_g, int flags);
+int ati_setup(void);
+
 // stdvgaio.c
 u8 stdvga_pelmask_read(void);
 void stdvga_pelmask_write(u8 val);
diff --git a/vgasrc/atiext.c b/vgasrc/atiext.c
new file mode 100644
index 000000000000..71460d3a1add
--- /dev/null
+++ b/vgasrc/atiext.c
@@ -0,0 +1,221 @@
+//  QEMU ATI VGABIOS Extension.
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "biosvar.h" // GET_GLOBAL
+#include "bregs.h" // struct bregs
+#include "hw/pci.h" // pci_config_readl
+#include "hw/pci_regs.h" // PCI_BASE_ADDRESS_0
+#include "output.h" // dprintf
+#include "stdvga.h" // VGAREG_SEQU_ADDRESS
+#include "string.h" // memset16_far
+#include "vgabios.h" // SET_VGA
+#include "vgautil.h" // VBE_total_memory
+#include "vgafb.h" // memset_high
+
+#include "ati_regs.h"
+#include "svgamodes.h"
+
+static u32 ati_io_addr VAR16 = 0;
+
+int
+is_ati_mode(struct vgamode_s *vmode_g)
+{
+    unsigned int mcount = GET_GLOBAL(svga_mcount);
+
+    return (vmode_g >= &svga_modes[0].info &&
+            vmode_g <= &svga_modes[mcount-1].info);
+}
+
+struct vgamode_s *
+ati_find_mode(int mode)
+{
+    u32 io_addr = GET_GLOBAL(ati_io_addr);
+    struct generic_svga_mode *table_g = svga_modes;
+    unsigned int mcount = GET_GLOBAL(svga_mcount);
+
+    if (io_addr) {
+        while (table_g < &svga_modes[mcount]) {
+            if (GET_GLOBAL(table_g->mode) == mode)
+                return &table_g->info;
+            table_g++;
+        }
+    }
+
+    return stdvga_find_mode(mode);
+}
+
+void
+ati_list_modes(u16 seg, u16 *dest, u16 *last)
+{
+    u32 io_addr = GET_GLOBAL(ati_io_addr);
+    unsigned int mcount = GET_GLOBAL(svga_mcount);
+
+    dprintf(1, "%s: ati ext %s\n", __func__, io_addr ? "yes" : "no");
+    if (io_addr) {
+        int i;
+        for (i=0; i<mcount && dest<last; i++) {
+            u16 mode = GET_GLOBAL(svga_modes[i].mode);
+            if (mode == 0xffff)
+                continue;
+            SET_FARVAR(seg, *dest, mode);
+            dest++;
+        }
+    }
+
+    stdvga_list_modes(seg, dest, last);
+}
+
+/****************************************************************
+ * Mode setting
+ ****************************************************************/
+
+static inline void ati_write(u32 reg, u32 val)
+{
+    u32 io_addr = GET_GLOBAL(ati_io_addr);
+
+    if (reg < 0x100) {
+        outl(val, io_addr + reg);
+    } else {
+        outl(reg, io_addr + MM_INDEX);
+        outl(val, io_addr + MM_DATA);
+    }
+}
+
+static void ati_clear(u32 offset, u32 size)
+{
+    u8 data[64];
+    void *datap = MAKE_FLATPTR(GET_SEG(SS), data);
+    void *fb = (void*)(GET_GLOBAL(VBE_framebuffer) + offset);
+    u32 i, pos;
+
+    for (i = 0; i < sizeof(data); i++)
+        data[i] = 0;
+    for (pos = 0; pos < size; pos += sizeof(data)) {
+        memcpy_high(fb, datap, sizeof(data));
+        fb += sizeof(data);
+    }
+}
+
+static int
+ati_ext_mode(struct generic_svga_mode *table, int flags)
+{
+    u32 width  = GET_GLOBAL(table->info.width);
+    u32 height = GET_GLOBAL(table->info.height);
+    u32 depth  = GET_GLOBAL(table->info.depth);
+    u32 stride = width;
+    u32 offset = 0;
+    u32 pxmask = 0;
+    u32 bytes  = 0;
+
+    dprintf(1, "%s: 0x%x, %dx%d-%d\n", __func__,
+            GET_GLOBAL(table->mode),
+            width, height, depth);
+
+    switch (depth) {
+    case  8: pxmask = CRTC_PIX_WIDTH_8BPP;  bytes = 1; break;
+    case 15: pxmask = CRTC_PIX_WIDTH_15BPP; bytes = 2; break;
+    case 16: pxmask = CRTC_PIX_WIDTH_16BPP; bytes = 2; break;
+    case 24: pxmask = CRTC_PIX_WIDTH_24BPP; bytes = 3; break;
+    case 32: pxmask = CRTC_PIX_WIDTH_32BPP; bytes = 4; break;
+    }
+
+    /* disable display */
+    ati_write(CRTC_EXT_CNTL, CRT_CRTC_DISPLAY_DIS);
+
+    /* modeset */
+    ati_write(CRTC_GEN_CNTL, CRTC2_EXT_DISP_EN | CRTC2_EN | pxmask);
+    ati_write(CRTC_H_TOTAL_DISP, ((width / 8) - 1) << 16);
+    ati_write(CRTC_V_TOTAL_DISP, (height - 1) << 16);
+    ati_write(CRTC_OFFSET, offset);
+    ati_write(CRTC_PITCH, stride / 8);
+
+    /* clear screen */
+    if (!(flags & MF_NOCLEARMEM)) {
+        u32 size = width * height * bytes;
+        ati_clear(offset, size);
+    }
+
+    /* enable display */
+    ati_write(CRTC_EXT_CNTL, 0);
+
+    return 0;
+}
+
+int
+ati_set_mode(struct vgamode_s *vmode_g, int flags)
+{
+    struct generic_svga_mode *table_g =
+        container_of(vmode_g, struct generic_svga_mode, info);
+
+    if (is_ati_mode(vmode_g)) {
+        return ati_ext_mode(table_g, flags);
+    }
+
+    ati_write(CRTC_GEN_CNTL, 0);
+    return stdvga_set_mode(vmode_g, flags);
+}
+
+/****************************************************************
+ * init
+ ****************************************************************/
+
+int
+ati_setup(void)
+{
+    int ret = stdvga_setup();
+    if (ret)
+        return ret;
+
+    dprintf(1, "%s:%d\n", __func__, __LINE__);
+
+    if (GET_GLOBAL(HaveRunInit))
+        return 0;
+
+    int bdf = GET_GLOBAL(VgaBDF);
+    if (!CONFIG_VGA_PCI || bdf == 0)
+        return 0;
+
+    u32 bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_0);
+    u32 lfb_addr = bar & PCI_BASE_ADDRESS_MEM_MASK;
+    pci_config_writel(bdf, PCI_BASE_ADDRESS_0, ~0);
+    u32 barmask = pci_config_readl(bdf, PCI_BASE_ADDRESS_0);
+    u32 totalmem = ~(barmask & PCI_BASE_ADDRESS_MEM_MASK) + 1;
+    pci_config_writel(bdf, PCI_BASE_ADDRESS_0, bar);
+
+    bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_1);
+    u32 io_addr = bar & PCI_BASE_ADDRESS_IO_MASK;
+
+    bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_2);
+    u32 mmio_addr = bar & PCI_BASE_ADDRESS_MEM_MASK;
+
+    dprintf(1, "ati: bdf %02x:%02x.%x, lfb 0x%x, %d MB, io 0x%x, mmio 0x%x\n",
+            pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf),
+            lfb_addr, totalmem / (1024 * 1024), io_addr, mmio_addr);
+
+    SET_VGA(VBE_framebuffer, lfb_addr);
+    SET_VGA(VBE_total_memory, totalmem);
+    SET_VGA(ati_io_addr, io_addr);
+
+    // Validate modes
+    struct generic_svga_mode *m = svga_modes;
+    unsigned int mcount = GET_GLOBAL(svga_mcount);
+    for (; m < &svga_modes[mcount]; m++) {
+        u8 memmodel = GET_GLOBAL(m->info.memmodel);
+        u16 width = GET_GLOBAL(m->info.width);
+        u16 height = GET_GLOBAL(m->info.height);
+        u32 mem = (height * DIV_ROUND_UP(width * vga_bpp(&m->info), 8)
+                   * stdvga_vram_ratio(&m->info));
+
+        if (width % 8 != 0 ||
+            width > 0x7ff * 8 ||
+            height > 0xfff ||
+            mem > totalmem ||
+            memmodel != MM_DIRECT) {
+            dprintf(1, "ati: removing mode 0x%x\n", GET_GLOBAL(m->mode));
+            SET_VGA(m->mode, 0xffff);
+        }
+    }
+
+    return 0;
+}
diff --git a/vgasrc/Kconfig b/vgasrc/Kconfig
index f6d843e0900b..c8fac36fb92b 100644
--- a/vgasrc/Kconfig
+++ b/vgasrc/Kconfig
@@ -27,6 +27,15 @@ menu "VGA ROM"
                 and Bochs emulators.  This is for emulators; it is not
                 intended for use on real Cirrus hardware.
 
+        config VGA_ATI
+            depends on QEMU
+            bool "QEMU ATI SVGA"
+            select VGA_STDVGA_PORTS
+            help
+                Build support for ATI VGA emulation found on QEMU
+                and emulators.  This is for emulators; it is not
+                intended for use on real ATI hardware.
+
         config VGA_BOCHS
             depends on QEMU
             bool "QEMU/Bochs VBE SVGA"
@@ -182,6 +191,7 @@ menu "VGA ROM"
         hex
         prompt "PCI Vendor ID" if OVERRIDE_PCI_ID
         default 0x1013 if VGA_CIRRUS
+        default 0x1002 if VGA_ATI
         default 0x1234 if VGA_BOCHS_STDVGA
         default 0x15ad if VGA_BOCHS_VMWARE
         default 0x1b36 if VGA_BOCHS_QXL
@@ -198,6 +208,7 @@ menu "VGA ROM"
         hex
         prompt "PCI Vendor ID" if OVERRIDE_PCI_ID
         default 0x00b8 if VGA_CIRRUS
+        default 0x5159 if VGA_ATI
         default 0x1111 if VGA_BOCHS_STDVGA
         default 0x0405 if VGA_BOCHS_VMWARE
         default 0x0100 if VGA_BOCHS_QXL
-- 
2.18.1
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