[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / gma500 / psb_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 "psb_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) {
		DRM_DEBUG("lvds_options found at %p\n", lvds_opts);
		p_type = lvds_opts->panel_type;
	} else {
		DRM_DEBUG("no lvds_options\n");
		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) {
		DRM_DEBUG("No memory\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;

	dev_priv->lvds_vbt = 1;

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

	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_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) {
		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_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"
	27	#include "psb_intel_bios.h"
	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
99	if (lvds_opts) {
100	DRM_DEBUG("lvds_options found at %p\n", lvds_opts);
101	p_type = lvds_opts->panel_type;
102	} else {
103	DRM_DEBUG("no lvds_options\n");
104	return;
105	}
106
107	bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
108	vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
109
110	lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
111	if (!lvds_bl) {
112	DRM_DEBUG("No memory\n");
113	return;
114	}
115
116	memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
117
118	dev_priv->lvds_bl = lvds_bl;
119	}
120
121	/* Try to find integrated panel data */
122	static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
123	struct bdb_header *bdb)
124	{
125	struct bdb_lvds_options *lvds_options;
126	struct bdb_lvds_lfp_data *lvds_lfp_data;
127	struct bdb_lvds_lfp_data_entry *entry;
128	struct lvds_dvo_timing *dvo_timing;
129	struct drm_display_mode *panel_fixed_mode;
130
131	/* Defaults if we can't find VBT info */
132	dev_priv->lvds_dither = 0;
133	dev_priv->lvds_vbt = 0;
134
135	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
136	if (!lvds_options)
137	return;
138
139	dev_priv->lvds_dither = lvds_options->pixel_dither;
140	if (lvds_options->panel_type == 0xff)
141	return;
142
143	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
144	if (!lvds_lfp_data)
145	return;
146
147	dev_priv->lvds_vbt = 1;
148
149	entry = &lvds_lfp_data->data[lvds_options->panel_type];
150	dvo_timing = &entry->dvo_timing;
151
152	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
153	GFP_KERNEL);
154
155	fill_detail_timing_data(panel_fixed_mode, dvo_timing);
156
157	dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
158
159	DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
160	drm_mode_debug_printmodeline(panel_fixed_mode);
161
162	return;
163	}
164
165	/* Try to find sdvo panel data */
166	static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
167	struct bdb_header *bdb)
168	{
169	struct bdb_sdvo_lvds_options *sdvo_lvds_options;
170	struct lvds_dvo_timing *dvo_timing;
171	struct drm_display_mode *panel_fixed_mode;
172
173	dev_priv->sdvo_lvds_vbt_mode = NULL;
174
175	sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
176	if (!sdvo_lvds_options)
177	return;
178
179	dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
180	if (!dvo_timing)
181	return;
182
183	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
184
185	if (!panel_fixed_mode)
186	return;
187
188	fill_detail_timing_data(panel_fixed_mode,
189	dvo_timing + sdvo_lvds_options->panel_type);
190
191	dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
192
193	return;
194	}
195
196	static void parse_general_features(struct drm_psb_private *dev_priv,
197	struct bdb_header *bdb)
198	{
199	struct bdb_general_features *general;
200
201	/* Set sensible defaults in case we can't find the general block */
202	dev_priv->int_tv_support = 1;
203	dev_priv->int_crt_support = 1;
204
205	general = find_section(bdb, BDB_GENERAL_FEATURES);
206	if (general) {
207	dev_priv->int_tv_support = general->int_tv_support;
208	dev_priv->int_crt_support = general->int_crt_support;
209	dev_priv->lvds_use_ssc = general->enable_ssc;
210
211	if (dev_priv->lvds_use_ssc) {
212	dev_priv->lvds_ssc_freq
213	= general->ssc_freq ? 100 : 96;
214	}
215	}
216	}
217
218	/**
219	* psb_intel_init_bios - initialize VBIOS settings & find VBT
220	* @dev: DRM device
221	*
222	* Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
223	* to appropriate values.
224	*
225	* VBT existence is a sanity check that is relied on by other i830_bios.c code.
226	* Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
227	* feed an updated VBT back through that, compared to what we'll fetch using
228	* this method of groping around in the BIOS data.
229	*
230	* Returns 0 on success, nonzero on failure.
231	*/
232	bool psb_intel_init_bios(struct drm_device *dev)
233	{
234	struct drm_psb_private *dev_priv = dev->dev_private;
235	struct pci_dev *pdev = dev->pdev;
236	struct vbt_header *vbt = NULL;
237	struct bdb_header *bdb;
238	u8 __iomem *bios;
239	size_t size;
240	int i;
241
242	bios = pci_map_rom(pdev, &size);
243	if (!bios)
244	return -1;
245
246	/* Scour memory looking for the VBT signature */
247	for (i = 0; i + 4 < size; i++) {
248	if (!memcmp(bios + i, "$VBT", 4)) {
249	vbt = (struct vbt_header *)(bios + i);
250	break;
251	}
252	}
253
254	if (!vbt) {
255	DRM_ERROR("VBT signature missing\n");
256	pci_unmap_rom(pdev, bios);
257	return -1;
258	}
259
260	bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
261
262	/* Grab useful general definitions */
263	parse_general_features(dev_priv, bdb);
264	parse_lfp_panel_data(dev_priv, bdb);
265	parse_sdvo_panel_data(dev_priv, bdb);
266	parse_backlight_data(dev_priv, bdb);
267
268	pci_unmap_rom(pdev, bios);
269
270	return 0;
271	}
272
273	/**
25985edc	274	* Destroy and free VBT data
0867b421	275	*/
487e873d	276	void psb_intel_destroy_bios(struct drm_device *dev)
0867b421 AC	277	{
	278	struct drm_psb_private *dev_priv = dev->dev_private;
	279	struct drm_display_mode *sdvo_lvds_vbt_mode =
	280	dev_priv->sdvo_lvds_vbt_mode;
	281	struct drm_display_mode *lfp_lvds_vbt_mode =
	282	dev_priv->lfp_lvds_vbt_mode;
	283	struct bdb_lvds_backlight *lvds_bl =
	284	dev_priv->lvds_bl;
	285
	286	/free sdvo panel mode/
	287	if (sdvo_lvds_vbt_mode) {
	288	dev_priv->sdvo_lvds_vbt_mode = NULL;
	289	kfree(sdvo_lvds_vbt_mode);
	290	}
	291
	292	if (lfp_lvds_vbt_mode) {
	293	dev_priv->lfp_lvds_vbt_mode = NULL;
	294	kfree(lfp_lvds_vbt_mode);
	295	}
	296
	297	if (lvds_bl) {
	298	dev_priv->lvds_bl = NULL;
	299	kfree(lvds_bl);
	300	}
	301	}