drivers/gpu/drm/gma500/mid_bios.c

   1 /**************************************************************************
   2  * Copyright (c) 2011, Intel Corporation.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  **************************************************************************/
  19
  20 /* TODO
  21  * - Split functions by vbt type
  22  * - Make them all take drm_device
  23  * - Check ioremap failures
  24  */
  25
  26 #include <drm/drmP.h>
  27 #include <drm/drm.h>
  28 #include <drm/gma_drm.h>
  29 #include "psb_drv.h"
  30 #include "mid_bios.h"
  31
  32 static void mid_get_fuse_settings(struct drm_device *dev)
  33 {
  34         struct drm_psb_private *dev_priv = dev->dev_private;
  35         struct pci_dev *pci_root = pci_get_bus_and_slot(0, 0);
  36         uint32_t fuse_value = 0;
  37         uint32_t fuse_value_tmp = 0;
  38
  39 #define FB_REG06 0xD0810600
  40 #define FB_MIPI_DISABLE  (1 << 11)
  41 #define FB_REG09 0xD0810900
  42 #define FB_SKU_MASK  0x7000
  43 #define FB_SKU_SHIFT 12
  44 #define FB_SKU_100 0
  45 #define FB_SKU_100L 1
  46 #define FB_SKU_83 2
  47         if (pci_root == NULL) {
  48                 WARN_ON(1);
  49                 return;
  50         }
  51
  52
  53         pci_write_config_dword(pci_root, 0xD0, FB_REG06);
  54         pci_read_config_dword(pci_root, 0xD4, &fuse_value);
  55
  56         /* FB_MIPI_DISABLE doesn't mean LVDS on with Medfield */
  57         if (IS_MRST(dev))
  58                 dev_priv->iLVDS_enable = fuse_value & FB_MIPI_DISABLE;
  59
  60         DRM_INFO("internal display is %s\n",
  61                  dev_priv->iLVDS_enable ? "LVDS display" : "MIPI display");
  62
  63          /* Prevent runtime suspend at start*/
  64          if (dev_priv->iLVDS_enable) {
  65                 dev_priv->is_lvds_on = true;
  66                 dev_priv->is_mipi_on = false;
  67         } else {
  68                 dev_priv->is_mipi_on = true;
  69                 dev_priv->is_lvds_on = false;
  70         }
  71
  72         dev_priv->video_device_fuse = fuse_value;
  73
  74         pci_write_config_dword(pci_root, 0xD0, FB_REG09);
  75         pci_read_config_dword(pci_root, 0xD4, &fuse_value);
  76
  77         dev_dbg(dev->dev, "SKU values is 0x%x.\n", fuse_value);
  78         fuse_value_tmp = (fuse_value & FB_SKU_MASK) >> FB_SKU_SHIFT;
  79
  80         dev_priv->fuse_reg_value = fuse_value;
  81
  82         switch (fuse_value_tmp) {
  83         case FB_SKU_100:
  84                 dev_priv->core_freq = 200;
  85                 break;
  86         case FB_SKU_100L:
  87                 dev_priv->core_freq = 100;
  88                 break;
  89         case FB_SKU_83:
  90                 dev_priv->core_freq = 166;
  91                 break;
  92         default:
  93                 dev_warn(dev->dev, "Invalid SKU values, SKU value = 0x%08x\n",
  94                                                                 fuse_value_tmp);
  95                 dev_priv->core_freq = 0;
  96         }
  97         dev_dbg(dev->dev, "LNC core clk is %dMHz.\n", dev_priv->core_freq);
  98         pci_dev_put(pci_root);
  99 }
 100
 101 /*
 102  *      Get the revison ID, B0:D2:F0;0x08
 103  */
 104 static void mid_get_pci_revID(struct drm_psb_private *dev_priv)
 105 {
 106         uint32_t platform_rev_id = 0;
 107         struct pci_dev *pci_gfx_root = pci_get_bus_and_slot(0, PCI_DEVFN(2, 0));
 108
 109         if (pci_gfx_root == NULL) {
 110                 WARN_ON(1);
 111                 return;
 112         }
 113         pci_read_config_dword(pci_gfx_root, 0x08, &platform_rev_id);
 114         dev_priv->platform_rev_id = (uint8_t) platform_rev_id;
 115         pci_dev_put(pci_gfx_root);
 116         dev_dbg(dev_priv->dev->dev, "platform_rev_id is %x\n",
 117                                         dev_priv->platform_rev_id);
 118 }
 119
 120 struct mid_vbt_header {
 121         u32 signature;
 122         u8 revision;
 123 } __packed;
 124
 125 /* The same for r0 and r1 */
 126 struct vbt_r0 {
 127         struct mid_vbt_header vbt_header;
 128         u8 size;
 129         u8 checksum;
 130 } __packed;
 131
 132 struct vbt_r10 {
 133         struct mid_vbt_header vbt_header;
 134         u8 checksum;
 135         u16 size;
 136         u8 panel_count;
 137         u8 primary_panel_idx;
 138         u8 secondary_panel_idx;
 139         u8 __reserved[5];
 140 } __packed;
 141
 142 static int read_vbt_r0(u32 addr, struct vbt_r0 *vbt)
 143 {
 144         void __iomem *vbt_virtual;
 145
 146         vbt_virtual = ioremap(addr, sizeof(*vbt));
 147         if (vbt_virtual == NULL)
 148                 return -1;
 149
 150         memcpy_fromio(vbt, vbt_virtual, sizeof(*vbt));
 151         iounmap(vbt_virtual);
 152
 153         return 0;
 154 }
 155
 156 static int read_vbt_r10(u32 addr, struct vbt_r10 *vbt)
 157 {
 158         void __iomem *vbt_virtual;
 159
 160         vbt_virtual = ioremap(addr, sizeof(*vbt));
 161         if (!vbt_virtual)
 162                 return -1;
 163
 164         memcpy_fromio(vbt, vbt_virtual, sizeof(*vbt));
 165         iounmap(vbt_virtual);
 166
 167         return 0;
 168 }
 169
 170 static int mid_get_vbt_data_r0(struct drm_psb_private *dev_priv, u32 addr)
 171 {
 172         struct vbt_r0 vbt;
 173         void __iomem *gct_virtual;
 174         struct gct_r0 gct;
 175         u8 bpi;
 176
 177         if (read_vbt_r0(addr, &vbt))
 178                 return -1;
 179
 180         gct_virtual = ioremap(addr + sizeof(vbt), vbt.size - sizeof(vbt));
 181         if (!gct_virtual)
 182                 return -1;
 183         memcpy_fromio(&gct, gct_virtual, sizeof(gct));
 184         iounmap(gct_virtual);
 185
 186         bpi = gct.PD.BootPanelIndex;
 187         dev_priv->gct_data.bpi = bpi;
 188         dev_priv->gct_data.pt = gct.PD.PanelType;
 189         dev_priv->gct_data.DTD = gct.panel[bpi].DTD;
 190         dev_priv->gct_data.Panel_Port_Control =
 191                 gct.panel[bpi].Panel_Port_Control;
 192         dev_priv->gct_data.Panel_MIPI_Display_Descriptor =
 193                 gct.panel[bpi].Panel_MIPI_Display_Descriptor;
 194
 195         return 0;
 196 }
 197
 198 static int mid_get_vbt_data_r1(struct drm_psb_private *dev_priv, u32 addr)
 199 {
 200         struct vbt_r0 vbt;
 201         void __iomem *gct_virtual;
 202         struct gct_r1 gct;
 203         u8 bpi;
 204
 205         if (read_vbt_r0(addr, &vbt))
 206                 return -1;
 207
 208         gct_virtual = ioremap(addr + sizeof(vbt), vbt.size - sizeof(vbt));
 209         if (!gct_virtual)
 210                 return -1;
 211         memcpy_fromio(&gct, gct_virtual, sizeof(gct));
 212         iounmap(gct_virtual);
 213
 214         bpi = gct.PD.BootPanelIndex;
 215         dev_priv->gct_data.bpi = bpi;
 216         dev_priv->gct_data.pt = gct.PD.PanelType;
 217         dev_priv->gct_data.DTD = gct.panel[bpi].DTD;
 218         dev_priv->gct_data.Panel_Port_Control =
 219                 gct.panel[bpi].Panel_Port_Control;
 220         dev_priv->gct_data.Panel_MIPI_Display_Descriptor =
 221                 gct.panel[bpi].Panel_MIPI_Display_Descriptor;
 222
 223         return 0;
 224 }
 225
 226 static int mid_get_vbt_data_r10(struct drm_psb_private *dev_priv, u32 addr)
 227 {
 228         struct vbt_r10 vbt;
 229         void __iomem *gct_virtual;
 230         struct gct_r10 *gct;
 231         struct oaktrail_timing_info *dp_ti = &dev_priv->gct_data.DTD;
 232         struct gct_r10_timing_info *ti;
 233         int ret = -1;
 234
 235         if (read_vbt_r10(addr, &vbt))
 236                 return -1;
 237
 238         gct = kmalloc(sizeof(*gct) * vbt.panel_count, GFP_KERNEL);
 239         if (!gct)
 240                 return -1;
 241
 242         gct_virtual = ioremap(addr + sizeof(vbt),
 243                         sizeof(*gct) * vbt.panel_count);
 244         if (!gct_virtual)
 245                 goto out;
 246         memcpy_fromio(gct, gct_virtual, sizeof(*gct));
 247         iounmap(gct_virtual);
 248
 249         dev_priv->gct_data.bpi = vbt.primary_panel_idx;
 250         dev_priv->gct_data.Panel_MIPI_Display_Descriptor =
 251                 gct[vbt.primary_panel_idx].Panel_MIPI_Display_Descriptor;
 252
 253         ti = &gct[vbt.primary_panel_idx].DTD;
 254         dp_ti->pixel_clock = ti->pixel_clock;
 255         dp_ti->hactive_hi = ti->hactive_hi;
 256         dp_ti->hactive_lo = ti->hactive_lo;
 257         dp_ti->hblank_hi = ti->hblank_hi;
 258         dp_ti->hblank_lo = ti->hblank_lo;
 259         dp_ti->hsync_offset_hi = ti->hsync_offset_hi;
 260         dp_ti->hsync_offset_lo = ti->hsync_offset_lo;
 261         dp_ti->hsync_pulse_width_hi = ti->hsync_pulse_width_hi;
 262         dp_ti->hsync_pulse_width_lo = ti->hsync_pulse_width_lo;
 263         dp_ti->vactive_hi = ti->vactive_hi;
 264         dp_ti->vactive_lo = ti->vactive_lo;
 265         dp_ti->vblank_hi = ti->vblank_hi;
 266         dp_ti->vblank_lo = ti->vblank_lo;
 267         dp_ti->vsync_offset_hi = ti->vsync_offset_hi;
 268         dp_ti->vsync_offset_lo = ti->vsync_offset_lo;
 269         dp_ti->vsync_pulse_width_hi = ti->vsync_pulse_width_hi;
 270         dp_ti->vsync_pulse_width_lo = ti->vsync_pulse_width_lo;
 271
 272         ret = 0;
 273 out:
 274         kfree(gct);
 275         return ret;
 276 }
 277
 278 static void mid_get_vbt_data(struct drm_psb_private *dev_priv)
 279 {
 280         struct drm_device *dev = dev_priv->dev;
 281         u32 addr;
 282         u8 __iomem *vbt_virtual;
 283         struct mid_vbt_header vbt_header;
 284         struct pci_dev *pci_gfx_root = pci_get_bus_and_slot(0, PCI_DEVFN(2, 0));
 285         int ret = -1;
 286
 287         /* Get the address of the platform config vbt */
 288         pci_read_config_dword(pci_gfx_root, 0xFC, &addr);
 289         pci_dev_put(pci_gfx_root);
 290
 291         dev_dbg(dev->dev, "drm platform config address is %x\n", addr);
 292
 293         if (!addr)
 294                 goto out;
 295
 296         /* get the virtual address of the vbt */
 297         vbt_virtual = ioremap(addr, sizeof(vbt_header));
 298         if (!vbt_virtual)
 299                 goto out;
 300
 301         memcpy_fromio(&vbt_header, vbt_virtual, sizeof(vbt_header));
 302         iounmap(vbt_virtual);
 303
 304         if (memcmp(&vbt_header.signature, "$GCT", 4))
 305                 goto out;
 306
 307         dev_dbg(dev->dev, "GCT revision is %02x\n", vbt_header.revision);
 308
 309         switch (vbt_header.revision) {
 310         case 0x00:
 311                 ret = mid_get_vbt_data_r0(dev_priv, addr);
 312                 break;
 313         case 0x01:
 314                 ret = mid_get_vbt_data_r1(dev_priv, addr);
 315                 break;
 316         case 0x10:
 317                 ret = mid_get_vbt_data_r10(dev_priv, addr);
 318                 break;
 319         default:
 320                 dev_err(dev->dev, "Unknown revision of GCT!\n");
 321         }
 322
 323 out:
 324         if (ret)
 325                 dev_err(dev->dev, "Unable to read GCT!");
 326         else
 327                 dev_priv->has_gct = true;
 328 }
 329
 330 int mid_chip_setup(struct drm_device *dev)
 331 {
 332         struct drm_psb_private *dev_priv = dev->dev_private;
 333         mid_get_fuse_settings(dev);
 334         mid_get_vbt_data(dev_priv);
 335         mid_get_pci_revID(dev_priv);
 336         return 0;
 337 }