/*
* Copyright © 2006 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include "intel_bios.h"
#define SLAVE_ADDR1 0x70
#define SLAVE_ADDR2 0x72
static void *
find_section(struct bdb_header *bdb, int section_id)
{
u8 *base = (u8 *)bdb;
int index = 0;
u16 total, current_size;
u8 current_id;
/* skip to first section */
index += bdb->header_size;
total = bdb->bdb_size;
/* walk the sections looking for section_id */
while (index < total) {
current_id = *(base + index);
index++;
current_size = *((u16 *)(base + index));
index += 2;
if (current_id == section_id)
return base + index;
index += current_size;
}
return NULL;
}
static u16
get_blocksize(void *p)
{
u16 *block_ptr, block_size;
block_ptr = (u16 *)((char *)p - 2);
block_size = *block_ptr;
return block_size;
}
static void
fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
struct lvds_dvo_timing *dvo_timing)
{
panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
dvo_timing->hactive_lo;
panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
dvo_timing->hsync_pulse_width;
panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
dvo_timing->vactive_lo;
panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
dvo_timing->vsync_off;
panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
dvo_timing->vsync_pulse_width;
panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
panel_fixed_mode->clock = dvo_timing->clock * 10;
panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
/* Some VBTs have bogus h/vtotal values */
if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
drm_mode_set_name(panel_fixed_mode);
}
/* Try to find integrated panel data */
static void
parse_lfp_panel_data(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct bdb_lvds_options *lvds_options;
struct bdb_lvds_lfp_data *lvds_lfp_data;
struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
struct bdb_lvds_lfp_data_entry *entry;
struct lvds_dvo_timing *dvo_timing;
struct drm_display_mode *panel_fixed_mode;
int lfp_data_size, dvo_timing_offset;
/* Defaults if we can't find VBT info */
dev_priv->lvds_dither = 0;
dev_priv->lvds_vbt = 0;
lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
if (!lvds_options)
return;
dev_priv->lvds_dither = lvds_options->pixel_dither;
if (lvds_options->panel_type == 0xff)
return;
lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
if (!lvds_lfp_data)
return;
lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
if (!lvds_lfp_data_ptrs)
return;
dev_priv->lvds_vbt = 1;
lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
entry = (struct bdb_lvds_lfp_data_entry *)
((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
lvds_options->panel_type));
dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
/*
* the size of fp_timing varies on the different platform.
* So calculate the DVO timing relative offset in LVDS data
* entry to get the DVO timing entry
*/
dvo_timing = (struct lvds_dvo_timing *)
((unsigned char *)entry + dvo_timing_offset);
panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
fill_detail_timing_data(panel_fixed_mode, dvo_timing);
dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
drm_mode_debug_printmodeline(panel_fixed_mode);
return;
}
/* Try to find sdvo panel data */
static void
parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct bdb_sdvo_lvds_options *sdvo_lvds_options;
struct lvds_dvo_timing *dvo_timing;
struct drm_display_mode *panel_fixed_mode;
dev_priv->sdvo_lvds_vbt_mode = NULL;
sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
if (!sdvo_lvds_options)
return;
dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
if (!dvo_timing)
return;
panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
if (!panel_fixed_mode)
return;
fill_detail_timing_data(panel_fixed_mode,
dvo_timing + sdvo_lvds_options->panel_type);
dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
return;
}
static void
parse_general_features(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct bdb_general_features *general;
/* Set sensible defaults in case we can't find the general block */
dev_priv->int_tv_support = 1;
dev_priv->int_crt_support = 1;
general = find_section(bdb, BDB_GENERAL_FEATURES);
if (general) {
dev_priv->int_tv_support = general->int_tv_support;
dev_priv->int_crt_support = general->int_crt_support;
dev_priv->lvds_use_ssc = general->enable_ssc;
if (dev_priv->lvds_use_ssc) {
if (IS_I85X(dev_priv->dev))
dev_priv->lvds_ssc_freq =
general->ssc_freq ? 66 : 48;
else if (IS_IGDNG(dev_priv->dev))
dev_priv->lvds_ssc_freq =
general->ssc_freq ? 100 : 120;
else
dev_priv->lvds_ssc_freq =
general->ssc_freq ? 100 : 96;
}
}
}
static void
parse_general_definitions(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct bdb_general_definitions *general;
const int crt_bus_map_table[] = {
GPIOB,
GPIOA,
GPIOC,
GPIOD,
GPIOE,
GPIOF,
};
/* Set sensible defaults in case we can't find the general block
or it is the wrong chipset */
dev_priv->crt_ddc_bus = -1;
general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
if (general) {
u16 block_size = get_blocksize(general);
if (block_size >= sizeof(*general)) {
int bus_pin = general->crt_ddc_gmbus_pin;
DRM_DEBUG("crt_ddc_bus_pin: %d\n", bus_pin);
if ((bus_pin >= 1) && (bus_pin <= 6)) {
dev_priv->crt_ddc_bus =
crt_bus_map_table[bus_pin-1];
}
} else {
DRM_DEBUG("BDB_GD too small (%d). Invalid.\n",
block_size);
}
}
}
static void
parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct sdvo_device_mapping *p_mapping;
struct bdb_general_definitions *p_defs;
struct child_device_config *p_child;
int i, child_device_num, count;
u16 block_size;
p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
if (!p_defs) {
DRM_DEBUG("No general definition block is found\n");
return;
}
/* judge whether the size of child device meets the requirements.
* If the child device size obtained from general definition block
* is different with sizeof(struct child_device_config), skip the
* parsing of sdvo device info
*/
if (p_defs->child_dev_size != sizeof(*p_child)) {
/* different child dev size . Ignore it */
DRM_DEBUG("different child size is found. Invalid.\n");
return;
}
/* get the block size of general definitions */
block_size = get_blocksize(p_defs);
/* get the number of child device */
child_device_num = (block_size - sizeof(*p_defs)) /
sizeof(*p_child);
count = 0;
for (i = 0; i < child_device_num; i++) {
p_child = &(p_defs->devices[i]);
if (!p_child->device_type) {
/* skip the device block if device type is invalid */
continue;
}
if (p_child->slave_addr != SLAVE_ADDR1 &&
p_child->slave_addr != SLAVE_ADDR2) {
/*
* If the slave address is neither 0x70 nor 0x72,
* it is not a SDVO device. Skip it.
*/
continue;
}
if (p_child->dvo_port != DEVICE_PORT_DVOB &&
p_child->dvo_port != DEVICE_PORT_DVOC) {
/* skip the incorrect SDVO port */
DRM_DEBUG("Incorrect SDVO port. Skip it \n");
continue;
}
DRM_DEBUG("the SDVO device with slave addr %2x is found on "
"%s port\n",
p_child->slave_addr,
(p_child->dvo_port == DEVICE_PORT_DVOB) ?
"SDVOB" : "SDVOC");
p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
if (!p_mapping->initialized) {
p_mapping->dvo_port = p_child->dvo_port;
p_mapping->slave_addr = p_child->slave_addr;
p_mapping->dvo_wiring = p_child->dvo_wiring;
p_mapping->initialized = 1;
} else {
DRM_DEBUG("Maybe one SDVO port is shared by "
"two SDVO device.\n");
}
if (p_child->slave2_addr) {
/* Maybe this is a SDVO device with multiple inputs */
/* And the mapping info is not added */
DRM_DEBUG("there exists the slave2_addr. Maybe this "
"is a SDVO device with multiple inputs.\n");
}
count++;
}
if (!count) {
/* No SDVO device info is found */
DRM_DEBUG("No SDVO device info is found in VBT\n");
}
return;
}
static void
parse_driver_features(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
struct drm_device *dev = dev_priv->dev;
struct bdb_driver_features *driver;
driver = find_section(bdb, BDB_DRIVER_FEATURES);
if (!driver)
return;
if (driver && SUPPORTS_EDP(dev) &&
driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
dev_priv->edp_support = 1;
} else {
dev_priv->edp_support = 0;
}
if (driver && driver->dual_frequency)
dev_priv->render_reclock_avail = true;
}
/**
* intel_init_bios - initialize VBIOS settings & find VBT
* @dev: DRM device
*
* Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
* to appropriate values.
*
* VBT existence is a sanity check that is relied on by other i830_bios.c code.
* Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
* feed an updated VBT back through that, compared to what we'll fetch using
* this method of groping around in the BIOS data.
*
* Returns 0 on success, nonzero on failure.
*/
bool
intel_init_bios(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct pci_dev *pdev = dev->pdev;
struct vbt_header *vbt = NULL;
struct bdb_header *bdb;
u8 __iomem *bios;
size_t size;
int i;
bios = pci_map_rom(pdev, &size);
if (!bios)
return -1;
/* Scour memory looking for the VBT signature */
for (i = 0; i + 4 < size; i++) {
if (!memcmp(bios + i, "$VBT", 4)) {
vbt = (struct vbt_header *)(bios + i);
break;
}
}
if (!vbt) {
DRM_ERROR("VBT signature missing\n");
pci_unmap_rom(pdev, bios);
return -1;
}
bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
/* Grab useful general definitions */
parse_general_features(dev_priv, bdb);
parse_general_definitions(dev_priv, bdb);
parse_lfp_panel_data(dev_priv, bdb);
parse_sdvo_panel_data(dev_priv, bdb);
parse_sdvo_device_mapping(dev_priv, bdb);
parse_driver_features(dev_priv, bdb);
pci_unmap_rom(pdev, bios);
return 0;
}
