[mirror_ubuntu-artful-kernel.git] / drivers / staging / gma500 / intel_bios.c

/*
 * Copyright (c) 2006 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */
#include <drm/drmP.h>
#include <drm/drm.h>
#include "psb_drm.h"
#include "psb_drv.h"
#include "psb_intel_drv.h"
#include "psb_intel_reg.h"
#include "intel_bios.h"


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 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);
}

static void parse_backlight_data(struct drm_psb_private *dev_priv,
				struct bdb_header *bdb)
{
	struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
	struct bdb_lvds_backlight *lvds_bl;
	u8 p_type = 0;
	void *bl_start = NULL;
	struct bdb_lvds_options *lvds_opts
				= find_section(bdb, BDB_LVDS_OPTIONS);

	dev_priv->lvds_bl = NULL;

	if (lvds_opts)
		p_type = lvds_opts->panel_type;
	else
		return;

	bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
	vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;

	lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
	if (!lvds_bl) {
		dev_err(dev_priv->dev->dev, "out of memory for backlight data\n");
		return;
	}
	memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
	dev_priv->lvds_bl = lvds_bl;
}

/* Try to find integrated panel data */
static void parse_lfp_panel_data(struct drm_psb_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_entry *entry;
	struct lvds_dvo_timing *dvo_timing;
	struct drm_display_mode *panel_fixed_mode;

	/* 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;


	entry = &lvds_lfp_data->data[lvds_options->panel_type];
	dvo_timing = &entry->dvo_timing;

	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
				      GFP_KERNEL);
	if (panel_fixed_mode == NULL) {
		dev_err(dev_priv->dev->dev, "out of memory for fixed panel mode\n");
		return;
	}

	dev_priv->lvds_vbt = 1;
	fill_detail_timing_data(panel_fixed_mode, dvo_timing);

	if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
		dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
		drm_mode_debug_printmodeline(panel_fixed_mode);
	} else {
		dev_dbg(dev_priv->dev->dev, "ignoring invalid LVDS VBT\n");
		dev_priv->lvds_vbt = 0;
		kfree(panel_fixed_mode);
	}
	return;
}

/* Try to find sdvo panel data */
static void parse_sdvo_panel_data(struct drm_psb_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_psb_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) {
			dev_priv->lvds_ssc_freq
				= general->ssc_freq ? 100 : 96;
		}
	}
}

/**
 * psb_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 psb_intel_init_bios(struct drm_device *dev)
{
	struct drm_psb_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) {
		dev_err(dev->dev, "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_lfp_panel_data(dev_priv, bdb);
	parse_sdvo_panel_data(dev_priv, bdb);
	parse_backlight_data(dev_priv, bdb);

	pci_unmap_rom(pdev, bios);

	return 0;
}

/**
 * Destroy and free VBT data
 */
void psb_intel_destroy_bios(struct drm_device *dev)
{
	struct drm_psb_private *dev_priv = dev->dev_private;
	struct drm_display_mode *sdvo_lvds_vbt_mode =
				dev_priv->sdvo_lvds_vbt_mode;
	struct drm_display_mode *lfp_lvds_vbt_mode =
				dev_priv->lfp_lvds_vbt_mode;
	struct bdb_lvds_backlight *lvds_bl =
				dev_priv->lvds_bl;

	/*free sdvo panel mode*/
	if (sdvo_lvds_vbt_mode) {
		dev_priv->sdvo_lvds_vbt_mode = NULL;
		kfree(sdvo_lvds_vbt_mode);
	}

	if (lfp_lvds_vbt_mode) {
		dev_priv->lfp_lvds_vbt_mode = NULL;
		kfree(lfp_lvds_vbt_mode);
	}

	if (lvds_bl) {
		dev_priv->lvds_bl = NULL;
		kfree(lvds_bl);
	}
}
Commit	Line	Data
0867b421 AC	1	/*
	2	* Copyright (c) 2006 Intel Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	16	*
	17	* Authors:
	18	* Eric Anholt <eric@anholt.net>
	19	*
	20	*/
	21	#include <drm/drmP.h>
	22	#include <drm/drm.h>
	23	#include "psb_drm.h"
	24	#include "psb_drv.h"
	25	#include "psb_intel_drv.h"
	26	#include "psb_intel_reg.h"
0cc729bf	27	#include "intel_bios.h"
0867b421 AC	28
	29
	30	static void find_section(struct bdb_header bdb, int section_id)
	31	{
	32	u8 base = (u8 )bdb;
	33	int index = 0;
	34	u16 total, current_size;
	35	u8 current_id;
	36
	37	/* skip to first section */
	38	index += bdb->header_size;
	39	total = bdb->bdb_size;
	40
	41	/* walk the sections looking for section_id */
	42	while (index < total) {
	43	current_id = *(base + index);
	44	index++;
	45	current_size = ((u16 )(base + index));
	46	index += 2;
	47	if (current_id == section_id)
	48	return base + index;
	49	index += current_size;
	50	}
	51
	52	return NULL;
	53	}
	54
	55	static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
	56	struct lvds_dvo_timing *dvo_timing)
	57	{
	58	panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) \|
	59	dvo_timing->hactive_lo;
	60	panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
	61	((dvo_timing->hsync_off_hi << 8) \| dvo_timing->hsync_off_lo);
	62	panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
	63	dvo_timing->hsync_pulse_width;
	64	panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
	65	((dvo_timing->hblank_hi << 8) \| dvo_timing->hblank_lo);
	66
	67	panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) \|
	68	dvo_timing->vactive_lo;
	69	panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
	70	dvo_timing->vsync_off;
	71	panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
	72	dvo_timing->vsync_pulse_width;
	73	panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
	74	((dvo_timing->vblank_hi << 8) \| dvo_timing->vblank_lo);
	75	panel_fixed_mode->clock = dvo_timing->clock * 10;
	76	panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
	77
	78	/* Some VBTs have bogus h/vtotal values */
	79	if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
	80	panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
	81	if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
	82	panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
	83
	84	drm_mode_set_name(panel_fixed_mode);
	85	}
	86
	87	static void parse_backlight_data(struct drm_psb_private *dev_priv,
	88	struct bdb_header *bdb)
	89	{
	90	struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
	91	struct bdb_lvds_backlight *lvds_bl;
92	u8 p_type = 0;
93	void *bl_start = NULL;
94	struct bdb_lvds_options *lvds_opts
95	= find_section(bdb, BDB_LVDS_OPTIONS);
96
97	dev_priv->lvds_bl = NULL;
98
99d8f034	99	if (lvds_opts)
0867b421	100	p_type = lvds_opts->panel_type;
99d8f034	101	else
0867b421	102	return;
0867b421 AC	103
	104	bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
	105	vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
	106
	107	lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
	108	if (!lvds_bl) {
99d8f034	109	dev_err(dev_priv->dev->dev, "out of memory for backlight data\n");
0867b421 AC	110	return;
0867b421 AC	111	}
0867b421	112	memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
0867b421 AC	113	dev_priv->lvds_bl = lvds_bl;
	114	}
	115
	116	/* Try to find integrated panel data */
	117	static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
	118	struct bdb_header *bdb)
	119	{
	120	struct bdb_lvds_options *lvds_options;
	121	struct bdb_lvds_lfp_data *lvds_lfp_data;
	122	struct bdb_lvds_lfp_data_entry *entry;
	123	struct lvds_dvo_timing *dvo_timing;
	124	struct drm_display_mode *panel_fixed_mode;
	125
	126	/* Defaults if we can't find VBT info */
	127	dev_priv->lvds_dither = 0;
	128	dev_priv->lvds_vbt = 0;
	129
	130	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
	131	if (!lvds_options)
	132	return;
	133
	134	dev_priv->lvds_dither = lvds_options->pixel_dither;
	135	if (lvds_options->panel_type == 0xff)
	136	return;
	137
	138	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
	139	if (!lvds_lfp_data)
	140	return;
	141
0867b421 AC	142
	143	entry = &lvds_lfp_data->data[lvds_options->panel_type];
	144	dvo_timing = &entry->dvo_timing;
	145
	146	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
	147	GFP_KERNEL);
398c4424 AC	148	if (panel_fixed_mode == NULL) {
	149	dev_err(dev_priv->dev->dev, "out of memory for fixed panel mode\n");
	150	return;
	151	}
0867b421	152
398c4424	153	dev_priv->lvds_vbt = 1;
0867b421 AC	154	fill_detail_timing_data(panel_fixed_mode, dvo_timing);
0867b421 AC	155
3ab8be53 PJ	156	if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
3ab8be53 PJ	157	dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
3ab8be53 PJ	158	drm_mode_debug_printmodeline(panel_fixed_mode);
3ab8be53 PJ	159	} else {
99d8f034	160	dev_dbg(dev_priv->dev->dev, "ignoring invalid LVDS VBT\n");
3ab8be53 PJ	161	dev_priv->lvds_vbt = 0;
	162	kfree(panel_fixed_mode);
	163	}
0867b421 AC	164	return;
	165	}
	166
	167	/* Try to find sdvo panel data */
	168	static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
	169	struct bdb_header *bdb)
	170	{
	171	struct bdb_sdvo_lvds_options *sdvo_lvds_options;
	172	struct lvds_dvo_timing *dvo_timing;
	173	struct drm_display_mode *panel_fixed_mode;
	174
	175	dev_priv->sdvo_lvds_vbt_mode = NULL;
	176
	177	sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
	178	if (!sdvo_lvds_options)
	179	return;
	180
	181	dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
	182	if (!dvo_timing)
	183	return;
	184
	185	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
	186
	187	if (!panel_fixed_mode)
	188	return;
	189
	190	fill_detail_timing_data(panel_fixed_mode,
	191	dvo_timing + sdvo_lvds_options->panel_type);
	192
	193	dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
	194
	195	return;
	196	}
	197
	198	static void parse_general_features(struct drm_psb_private *dev_priv,
	199	struct bdb_header *bdb)
	200	{
	201	struct bdb_general_features *general;
	202
	203	/* Set sensible defaults in case we can't find the general block */
	204	dev_priv->int_tv_support = 1;
	205	dev_priv->int_crt_support = 1;
	206
	207	general = find_section(bdb, BDB_GENERAL_FEATURES);
	208	if (general) {
	209	dev_priv->int_tv_support = general->int_tv_support;
	210	dev_priv->int_crt_support = general->int_crt_support;
	211	dev_priv->lvds_use_ssc = general->enable_ssc;
	212
	213	if (dev_priv->lvds_use_ssc) {
	214	dev_priv->lvds_ssc_freq
	215	= general->ssc_freq ? 100 : 96;
	216	}
	217	}
	218	}
	219
	220	/**
	221	* psb_intel_init_bios - initialize VBIOS settings & find VBT
	222	* @dev: DRM device
	223	*
	224	* Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
	225	* to appropriate values.
	226	*
	227	* VBT existence is a sanity check that is relied on by other i830_bios.c code.
228	* Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
229	* feed an updated VBT back through that, compared to what we'll fetch using
230	* this method of groping around in the BIOS data.
231	*
232	* Returns 0 on success, nonzero on failure.
233	*/
234	bool psb_intel_init_bios(struct drm_device *dev)
235	{
236	struct drm_psb_private *dev_priv = dev->dev_private;
237	struct pci_dev *pdev = dev->pdev;
238	struct vbt_header *vbt = NULL;
239	struct bdb_header *bdb;
240	u8 __iomem *bios;
241	size_t size;
242	int i;
243
244	bios = pci_map_rom(pdev, &size);
245	if (!bios)
246	return -1;
247
248	/* Scour memory looking for the VBT signature */
249	for (i = 0; i + 4 < size; i++) {
250	if (!memcmp(bios + i, "$VBT", 4)) {
251	vbt = (struct vbt_header *)(bios + i);
252	break;
253	}
254	}
255
256	if (!vbt) {
99d8f034	257	dev_err(dev->dev, "VBT signature missing\n");
0867b421 AC	258	pci_unmap_rom(pdev, bios);
	259	return -1;
	260	}
	261
	262	bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
	263
	264	/* Grab useful general definitions */
	265	parse_general_features(dev_priv, bdb);
	266	parse_lfp_panel_data(dev_priv, bdb);
	267	parse_sdvo_panel_data(dev_priv, bdb);
	268	parse_backlight_data(dev_priv, bdb);
	269
	270	pci_unmap_rom(pdev, bios);
	271
	272	return 0;
	273	}
	274
	275	/**
25985edc	276	* Destroy and free VBT data
0867b421	277	*/
487e873d	278	void psb_intel_destroy_bios(struct drm_device *dev)
0867b421 AC	279	{
	280	struct drm_psb_private *dev_priv = dev->dev_private;
	281	struct drm_display_mode *sdvo_lvds_vbt_mode =
	282	dev_priv->sdvo_lvds_vbt_mode;
	283	struct drm_display_mode *lfp_lvds_vbt_mode =
	284	dev_priv->lfp_lvds_vbt_mode;
	285	struct bdb_lvds_backlight *lvds_bl =
	286	dev_priv->lvds_bl;
	287
	288	/free sdvo panel mode/
	289	if (sdvo_lvds_vbt_mode) {
	290	dev_priv->sdvo_lvds_vbt_mode = NULL;
	291	kfree(sdvo_lvds_vbt_mode);
	292	}
	293
	294	if (lfp_lvds_vbt_mode) {
	295	dev_priv->lfp_lvds_vbt_mode = NULL;
	296	kfree(lfp_lvds_vbt_mode);
	297	}
	298
	299	if (lvds_bl) {
	300	dev_priv->lvds_bl = NULL;
	301	kfree(lvds_bl);
	302	}
	303	}