OMAP: DSS2: SDI driver

/*

 * linux/drivers/video/omap2/dss/sdi.c

 *

 * Copyright (C) 2009 Nokia Corporation

 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * This program is distributed in the hope that 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, see <http://www.gnu.org/licenses/>.

 */

#define DSS_SUBSYS_NAME "SDI"

#include <linux/kernel.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <plat/display.h>

#include "dss.h"

static struct {

	bool skip_init;

	bool update_enabled;

} sdi;

static void sdi_basic_init(void)

{

	dispc_set_parallel_interface_mode(OMAP_DSS_PARALLELMODE_BYPASS);

	dispc_set_lcd_display_type(OMAP_DSS_LCD_DISPLAY_TFT);

	dispc_set_tft_data_lines(24);

	dispc_lcd_enable_signal_polarity(1);

}

static int sdi_display_enable(struct omap_dss_device *dssdev)

{

	struct omap_video_timings *t = &dssdev->panel.timings;

	struct dss_clock_info dss_cinfo;

	struct dispc_clock_info dispc_cinfo;

	u16 lck_div, pck_div;

	unsigned long fck;

	unsigned long pck;

	int r;

	r = omap_dss_start_device(dssdev);

	if (r) {

		DSSERR("failed to start device\n");

		goto err0;

	}

	if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {

		DSSERR("dssdev already enabled\n");

		r = -EINVAL;

		goto err1;

	}

	/* In case of skip_init sdi_init has already enabled the clocks */

	if (!sdi.skip_init)

		dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);

	sdi_basic_init();

	/* 15.5.9.1.2 */

	dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;

	dispc_set_pol_freq(dssdev->panel.config, dssdev->panel.acbi,

			dssdev->panel.acb);

	if (!sdi.skip_init) {

		r = dss_calc_clock_div(1, t->pixel_clock * 1000,

				&dss_cinfo, &dispc_cinfo);

	} else {

		r = dss_get_clock_div(&dss_cinfo);

		r = dispc_get_clock_div(&dispc_cinfo);

	}

	if (r)

		goto err2;

	fck = dss_cinfo.fck;

	lck_div = dispc_cinfo.lck_div;

	pck_div = dispc_cinfo.pck_div;

	pck = fck / lck_div / pck_div / 1000;

	if (pck != t->pixel_clock) {

		DSSWARN("Could not find exact pixel clock. Requested %d kHz, "

				"got %lu kHz\n",

				t->pixel_clock, pck);

		t->pixel_clock = pck;

	}

	dispc_set_lcd_timings(t);

	r = dss_set_clock_div(&dss_cinfo);

	if (r)

		goto err2;

	r = dispc_set_clock_div(&dispc_cinfo);

	if (r)

		goto err2;

	if (!sdi.skip_init) {

		dss_sdi_init(dssdev->phy.sdi.datapairs);

		r = dss_sdi_enable();

		if (r)

			goto err1;

		mdelay(2);

	}

	dispc_enable_lcd_out(1);

	if (dssdev->driver->enable) {

		r = dssdev->driver->enable(dssdev);

		if (r)

			goto err3;

	}

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	sdi.skip_init = 0;

	return 0;

err3:

	dispc_enable_lcd_out(0);

err2:

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

err1:

	omap_dss_stop_device(dssdev);

err0:

	return r;

}

static int sdi_display_resume(struct omap_dss_device *dssdev);

static void sdi_display_disable(struct omap_dss_device *dssdev)

{

	if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED)

		return;

	if (dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)

		if (sdi_display_resume(dssdev))

			return;

	if (dssdev->driver->disable)

		dssdev->driver->disable(dssdev);

	dispc_enable_lcd_out(0);

	dss_sdi_disable();

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;

	omap_dss_stop_device(dssdev);

}

static int sdi_display_suspend(struct omap_dss_device *dssdev)

{

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)

		return -EINVAL;

	if (dssdev->driver->suspend)

		dssdev->driver->suspend(dssdev);

	dispc_enable_lcd_out(0);

	dss_sdi_disable();

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;

	return 0;

}

static int sdi_display_resume(struct omap_dss_device *dssdev)

{

	int r;

	if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)

		return -EINVAL;

	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);

	r = dss_sdi_enable();

	if (r)

		goto err;

	mdelay(2);

	dispc_enable_lcd_out(1);

	if (dssdev->driver->resume)

		dssdev->driver->resume(dssdev);

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return 0;

err:

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

	return r;

}

static int sdi_display_set_update_mode(struct omap_dss_device *dssdev,

		enum omap_dss_update_mode mode)

{

	if (mode == OMAP_DSS_UPDATE_MANUAL)

		return -EINVAL;

	if (mode == OMAP_DSS_UPDATE_DISABLED) {

		dispc_enable_lcd_out(0);

		sdi.update_enabled = 0;

	} else {

		dispc_enable_lcd_out(1);

		sdi.update_enabled = 1;

	}

	return 0;

}

static enum omap_dss_update_mode sdi_display_get_update_mode(

		struct omap_dss_device *dssdev)

{

	return sdi.update_enabled ? OMAP_DSS_UPDATE_AUTO :

		OMAP_DSS_UPDATE_DISABLED;

}

static void sdi_get_timings(struct omap_dss_device *dssdev,

			struct omap_video_timings *timings)

{

	*timings = dssdev->panel.timings;

}

int sdi_init_display(struct omap_dss_device *dssdev)

{

	DSSDBG("SDI init\n");

	dssdev->enable = sdi_display_enable;

	dssdev->disable = sdi_display_disable;

	dssdev->suspend = sdi_display_suspend;

	dssdev->resume = sdi_display_resume;

	dssdev->set_update_mode = sdi_display_set_update_mode;

	dssdev->get_update_mode = sdi_display_get_update_mode;

	dssdev->get_timings = sdi_get_timings;

	return 0;

}

int sdi_init(bool skip_init)

{

	/* we store this for first display enable, then clear it */

	sdi.skip_init = skip_init;

	/*

	 * Enable clocks already here, otherwise there would be a toggle

	 * of them until sdi_display_enable is called.

	 */

	if (skip_init)

		dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);

	return 0;

}

void sdi_exit(void)

{

}