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;
  55         u16 id;
  56
  57         if (/* (ent->driver_data == BOCHS_QEMU_STDVGA) && */
  58             (pdev->resource[2].flags & IORESOURCE_MEM)) {
  59                 /* mmio bar with vga and bochs registers present */
  60                 if (pci_request_region(pdev, 2, "bochs-drm") != 0) {
  61                         DRM_ERROR("Cannot request mmio region\n");
  62                         return -EBUSY;
  63                 }
  64                 ioaddr = pci_resource_start(pdev, 2);
  65                 iosize = pci_resource_len(pdev, 2);
  66                 bochs->mmio = ioremap(ioaddr, iosize);
  67                 if (bochs->mmio == NULL) {
  68                         DRM_ERROR("Cannot map mmio region\n");
  69                         return -ENOMEM;
  70                 }
  71         } else {
  72                 ioaddr = VBE_DISPI_IOPORT_INDEX;
  73                 iosize = 2;
  74                 if (!request_region(ioaddr, iosize, "bochs-drm")) {
  75                         DRM_ERROR("Cannot request ioports\n");
  76                         return -EBUSY;
  77                 }
  78                 bochs->ioports = 1;
  79         }
  80
  81         id = bochs_dispi_read(bochs, VBE_DISPI_INDEX_ID);
  82         mem = bochs_dispi_read(bochs, VBE_DISPI_INDEX_VIDEO_MEMORY_64K)
  83                 * 64 * 1024;
  84         if ((id & 0xfff0) != VBE_DISPI_ID0) {
  85                 DRM_ERROR("ID mismatch\n");
  86                 return -ENODEV;
  87         }
  88
  89         if ((pdev->resource[0].flags & IORESOURCE_MEM) == 0)
  90                 return -ENODEV;
  91         addr = pci_resource_start(pdev, 0);
  92         size = pci_resource_len(pdev, 0);
  93         if (addr == 0)
  94                 return -ENODEV;
  95         if (size != mem) {
  96                 DRM_ERROR("Size mismatch: pci=%ld, bochs=%ld\n",
  97                         size, mem);
  98                 size = min(size, mem);
  99         }
 100
 101         if (pci_request_region(pdev, 0, "bochs-drm") != 0) {
 102                 DRM_ERROR("Cannot request framebuffer\n");
 103                 return -EBUSY;
 104         }
 105
 106         bochs->fb_map = ioremap(addr, size);
 107         if (bochs->fb_map == NULL) {
 108                 DRM_ERROR("Cannot map framebuffer\n");
 109                 return -ENOMEM;
 110         }
 111         bochs->fb_base = addr;
 112         bochs->fb_size = size;
 113
 114         DRM_INFO("Found bochs VGA, ID 0x%x.\n", id);
 115         DRM_INFO("Framebuffer size %ld kB @ 0x%lx, %s @ 0x%lx.\n",
 116                  size / 1024, addr,
 117                  bochs->ioports ? "ioports" : "mmio",
 118                  ioaddr);
 119         return 0;
 120 }
 121
 122 void bochs_hw_fini(struct drm_device *dev)
 123 {
 124         struct bochs_device *bochs = dev->dev_private;
 125
 126         if (bochs->mmio)
 127                 iounmap(bochs->mmio);
 128         if (bochs->ioports)
 129                 release_region(VBE_DISPI_IOPORT_INDEX, 2);
 130         if (bochs->fb_map)
 131                 iounmap(bochs->fb_map);
 132         pci_release_regions(dev->pdev);
 133 }
 134
 135 void bochs_hw_setmode(struct bochs_device *bochs,
 136                       struct drm_display_mode *mode)
 137 {
 138         bochs->xres = mode->hdisplay;
 139         bochs->yres = mode->vdisplay;
 140         bochs->bpp = 32;
 141         bochs->stride = mode->hdisplay * (bochs->bpp / 8);
 142         bochs->yres_virtual = bochs->fb_size / bochs->stride;
 143
 144         DRM_DEBUG_DRIVER("%dx%d @ %d bpp, vy %d\n",
 145                          bochs->xres, bochs->yres, bochs->bpp,
 146                          bochs->yres_virtual);
 147
 148         bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */
 149
 150         bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP,         bochs->bpp);
 151         bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES,        bochs->xres);
 152         bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES,        bochs->yres);
 153         bochs_dispi_write(bochs, VBE_DISPI_INDEX_BANK,        0);
 154         bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH,  bochs->xres);
 155         bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_HEIGHT,
 156                           bochs->yres_virtual);
 157         bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET,    0);
 158         bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET,    0);
 159
 160         bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE,
 161                           VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
 162 }
 163
 164 void bochs_hw_setbase(struct bochs_device *bochs,
 165                       int x, int y, u64 addr)
 166 {
 167         unsigned long offset = (unsigned long)addr +
 168                 y * bochs->stride +
 169                 x * (bochs->bpp / 8);
 170         int vy = offset / bochs->stride;
 171         int vx = (offset % bochs->stride) * 8 / bochs->bpp;
 172
 173         DRM_DEBUG_DRIVER("x %d, y %d, addr %llx -> offset %lx, vx %d, vy %d\n",
 174                          x, y, addr, offset, vx, vy);
 175         bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, vx);
 176         bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, vy);
 177 }