drivers/gpu/drm/bochs/bochs_hw.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include "bochs.h"
   9
  10 /* ---------------------------------------------------------------------- */
  11
  12 static void bochs_vga_writeb(struct bochs_device *bochs, u16 ioport, u8 val)
  13 {
  14         if (WARN_ON(ioport < 0x3c0 || ioport > 0x3df))
  15                 return;
  16
  17         if (bochs->mmio) {
  18                 int offset = ioport - 0x3c0 + 0x400;
  19                 writeb(val, bochs->mmio + offset);
  20         } else {
  21                 outb(val, ioport);
  22         }
  23 }
  24
  25 static u16 bochs_dispi_read(struct bochs_device *bochs, u16 reg)
  26 {
  27         u16 ret = 0;
  28
  29         if (bochs->mmio) {
  30                 int offset = 0x500 + (reg << 1);
  31                 ret = readw(bochs->mmio + offset);
  32         } else {
  33                 outw(reg, VBE_DISPI_IOPORT_INDEX);
  34                 ret = inw(VBE_DISPI_IOPORT_DATA);
  35         }
  36         return ret;
  37 }
  38
  39 static void bochs_dispi_write(struct bochs_device *bochs, u16 reg, u16 val)
  40 {
  41         if (bochs->mmio) {
  42                 int offset = 0x500 + (reg << 1);
  43                 writew(val, bochs->mmio + offset);
  44         } else {
  45                 outw(reg, VBE_DISPI_IOPORT_INDEX);
  46                 outw(val, VBE_DISPI_IOPORT_DATA);
  47         }
  48 }
  49
  50 int bochs_hw_init(struct drm_device *dev, uint32_t flags)
  51 {
  52         struct bochs_device *bochs = dev->dev_private;
  53         struct pci_dev *pdev = dev->pdev;
  54         unsigned long addr, size, mem, ioaddr, iosize, qext_size;
  55         u16 id;
  56
  57         if (pdev->resource[2].flags & IORESOURCE_MEM) {
  58                 /* mmio bar with vga and bochs registers present */
  59                 if (pci_request_region(pdev, 2, "bochs-drm") != 0) {
  60                         DRM_ERROR("Cannot request mmio region\n");
  61                         return -EBUSY;
  62                 }
  63                 ioaddr = pci_resource_start(pdev, 2);
  64                 iosize = pci_resource_len(pdev, 2);
  65                 bochs->mmio = ioremap(ioaddr, iosize);
  66                 if (bochs->mmio == NULL) {
  67                         DRM_ERROR("Cannot map mmio region\n");
  68                         return -ENOMEM;
  69                 }
  70         } else {
  71                 ioaddr = VBE_DISPI_IOPORT_INDEX;
  72                 iosize = 2;
  73                 if (!request_region(ioaddr, iosize, "bochs-drm")) {
  74                         DRM_ERROR("Cannot request ioports\n");
  75                         return -EBUSY;
  76                 }
  77                 bochs->ioports = 1;
  78         }
  79
  80         id = bochs_dispi_read(bochs, VBE_DISPI_INDEX_ID);
  81         mem = bochs_dispi_read(bochs, VBE_DISPI_INDEX_VIDEO_MEMORY_64K)
  82                 * 64 * 1024;
  83         if ((id & 0xfff0) != VBE_DISPI_ID0) {
  84                 DRM_ERROR("ID mismatch\n");
  85                 return -ENODEV;
  86         }
  87
  88         if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0)
  89                 return -ENODEV;
  90         addr = pci_resource_start(pdev, 0);
  91         size = pci_resource_len(pdev, 0);
  92         if (addr == 0)
  93                 return -ENODEV;
  94         if (size != mem) {
  95                 DRM_ERROR("Size mismatch: pci=%ld, bochs=%ld\n",
  96                         size, mem);
  97                 size = min(size, mem);
  98         }
  99
 100         if (pci_request_region(pdev, 0, "bochs-drm") != 0)
 101                 DRM_WARN("Cannot request framebuffer, boot fb still active?\n");
 102
 103         bochs->fb_map = ioremap(addr, size);
 104         if (bochs->fb_map == NULL) {
 105                 DRM_ERROR("Cannot map framebuffer\n");
 106                 return -ENOMEM;
 107         }
 108         bochs->fb_base = addr;
 109         bochs->fb_size = size;
 110
 111         DRM_INFO("Found bochs VGA, ID 0x%x.\n", id);
 112         DRM_INFO("Framebuffer size %ld kB @ 0x%lx, %s @ 0x%lx.\n",
 113                  size / 1024, addr,
 114                  bochs->ioports ? "ioports" : "mmio",
 115                  ioaddr);
 116
 117         if (bochs->mmio && pdev->revision >= 2) {
 118                 qext_size = readl(bochs->mmio + 0x600);
 119                 if (qext_size < 4 || qext_size > iosize)
 120                         goto noext;
 121                 DRM_DEBUG("Found qemu ext regs, size %ld\n", qext_size);
 122                 if (qext_size >= 8) {
 123 #ifdef __BIG_ENDIAN
 124                         writel(0xbebebebe, bochs->mmio + 0x604);
 125 #else
 126                         writel(0x1e1e1e1e, bochs->mmio + 0x604);
 127 #endif
 128                         DRM_DEBUG("  qext endian: 0x%x\n",
 129                                   readl(bochs->mmio + 0x604));
 130                 }
 131         }
 132
 133 noext:
 134         return 0;
 135 }
 136
 137 void bochs_hw_fini(struct drm_device *dev)
 138 {
 139         struct bochs_device *bochs = dev->dev_private;
 140
 141         if (bochs->mmio)
 142                 iounmap(bochs->mmio);
 143         if (bochs->ioports)
 144                 release_region(VBE_DISPI_IOPORT_INDEX, 2);
 145         if (bochs->fb_map)
 146                 iounmap(bochs->fb_map);
 147         pci_release_regions(dev->pdev);
 148 }
 149
 150 void bochs_hw_setmode(struct bochs_device *bochs,
 151                       struct drm_display_mode *mode)
 152 {
 153         bochs->xres = mode->hdisplay;
 154         bochs->yres = mode->vdisplay;
 155         bochs->bpp = 32;
 156         bochs->stride = mode->hdisplay * (bochs->bpp / 8);
 157         bochs->yres_virtual = bochs->fb_size / bochs->stride;
 158
 159         DRM_DEBUG_DRIVER("%dx%d @ %d bpp, vy %d\n",
 160                          bochs->xres, bochs->yres, bochs->bpp,
 161                          bochs->yres_virtual);
 162
 163         bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
 164
 165         bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,      0);
 166         bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP,         bochs->bpp);
 167         bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES,        bochs->xres);
 168         bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES,        bochs->yres);
 169         bochs_dispi_write(bochs, VBE_DISPI_INDEX_BANK,        0);
 170         bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH,  bochs->xres);
 171         bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_HEIGHT,
 172                           bochs->yres_virtual);
 173         bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET,    0);
 174         bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET,    0);
 175
 176         bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,
 177                           VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
 178 }
 179
 180 void bochs_hw_setbase(struct bochs_device *bochs,
 181                       int x, int y, u64 addr)
 182 {
 183         unsigned long offset = (unsigned long)addr +
 184                 y * bochs->stride +
 185                 x * (bochs->bpp / 8);
 186         int vy = offset / bochs->stride;
 187         int vx = (offset % bochs->stride) * 8 / bochs->bpp;
 188
 189         DRM_DEBUG_DRIVER("x %d, y %d, addr %llx -> offset %lx, vx %d, vy %d\n",
 190                          x, y, addr, offset, vx, vy);
 191         bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, vx);
 192         bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, vy);
 193 }