OMAP: DSS2: DPI driver

/*

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

 *

 * Copyright (C) 2009 Nokia Corporation

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

 *

 * Some code and ideas taken from drivers/video/omap/ driver

 * by Imre Deak.

 *

 * 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 "DPI"

#include <linux/kernel.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <plat/display.h>

#include <plat/cpu.h>

#include "dss.h"

static struct {

	int update_enabled;

} dpi;

#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL

static int dpi_set_dsi_clk(bool is_tft, unsigned long pck_req,

		unsigned long *fck, int *lck_div, int *pck_div)

{

	struct dsi_clock_info dsi_cinfo;

	struct dispc_clock_info dispc_cinfo;

	int r;

	r = dsi_pll_calc_clock_div_pck(is_tft, pck_req, &dsi_cinfo,

			&dispc_cinfo);

	if (r)

		return r;

	r = dsi_pll_set_clock_div(&dsi_cinfo);

	if (r)

		return r;

	dss_select_clk_source(0, 1);

	r = dispc_set_clock_div(&dispc_cinfo);

	if (r)

		return r;

	*fck = dsi_cinfo.dsi1_pll_fclk;

	*lck_div = dispc_cinfo.lck_div;

	*pck_div = dispc_cinfo.pck_div;

	return 0;

}

#else

static int dpi_set_dispc_clk(bool is_tft, unsigned long pck_req,

		unsigned long *fck, int *lck_div, int *pck_div)

{

	struct dss_clock_info dss_cinfo;

	struct dispc_clock_info dispc_cinfo;

	int r;

	r = dss_calc_clock_div(is_tft, pck_req, &dss_cinfo, &dispc_cinfo);

	if (r)

		return r;

	r = dss_set_clock_div(&dss_cinfo);

	if (r)

		return r;

	r = dispc_set_clock_div(&dispc_cinfo);

	if (r)

		return r;

	*fck = dss_cinfo.fck;

	*lck_div = dispc_cinfo.lck_div;

	*pck_div = dispc_cinfo.pck_div;

	return 0;

}

#endif

static int dpi_set_mode(struct omap_dss_device *dssdev)

{

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

	int lck_div, pck_div;

	unsigned long fck;

	unsigned long pck;

	bool is_tft;

	int r = 0;

	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);

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

			dssdev->panel.acb);

	is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;

#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL

	r = dpi_set_dsi_clk(is_tft, t->pixel_clock * 1000,

			&fck, &lck_div, &pck_div);

#else

	r = dpi_set_dispc_clk(is_tft, t->pixel_clock * 1000,

			&fck, &lck_div, &pck_div);

#endif

	if (r)

		goto err0;

	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);

err0:

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

	return r;

}

static int dpi_basic_init(struct omap_dss_device *dssdev)

{

	bool is_tft;

	is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;

	dispc_set_parallel_interface_mode(OMAP_DSS_PARALLELMODE_BYPASS);

	dispc_set_lcd_display_type(is_tft ? OMAP_DSS_LCD_DISPLAY_TFT :

			OMAP_DSS_LCD_DISPLAY_STN);

	dispc_set_tft_data_lines(dssdev->phy.dpi.data_lines);

	return 0;

}

static int dpi_display_enable(struct omap_dss_device *dssdev)

{

	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("display already enabled\n");

		r = -EINVAL;

		goto err1;

	}

	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);

	r = dpi_basic_init(dssdev);

	if (r)

		goto err2;

#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL

	dss_clk_enable(DSS_CLK_FCK2);

	r = dsi_pll_init(dssdev, 0, 1);

	if (r)

		goto err3;

#endif

	r = dpi_set_mode(dssdev);

	if (r)

		goto err4;

	mdelay(2);

	dispc_enable_lcd_out(1);

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

	if (r)

		goto err5;

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return 0;

err5:

	dispc_enable_lcd_out(0);

err4:

#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL

	dsi_pll_uninit();

err3:

	dss_clk_disable(DSS_CLK_FCK2);

#endif

err2:

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

err1:

	omap_dss_stop_device(dssdev);

err0:

	return r;

}

static int dpi_display_resume(struct omap_dss_device *dssdev);

static void dpi_display_disable(struct omap_dss_device *dssdev)

{

	if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED)

		return;

	if (dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)

		dpi_display_resume(dssdev);

	dssdev->driver->disable(dssdev);

	dispc_enable_lcd_out(0);

#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL

	dss_select_clk_source(0, 0);

	dsi_pll_uninit();

	dss_clk_disable(DSS_CLK_FCK2);

#endif

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;

	omap_dss_stop_device(dssdev);

}

static int dpi_display_suspend(struct omap_dss_device *dssdev)

{

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)

		return -EINVAL;

	DSSDBG("dpi_display_suspend\n");

	if (dssdev->driver->suspend)

		dssdev->driver->suspend(dssdev);

	dispc_enable_lcd_out(0);

	dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);

	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;

	return 0;

}

static int dpi_display_resume(struct omap_dss_device *dssdev)

{

	if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)

		return -EINVAL;

	DSSDBG("dpi_display_resume\n");

	dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);

	dispc_enable_lcd_out(1);

	if (dssdev->driver->resume)

		dssdev->driver->resume(dssdev);

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return 0;

}

static void dpi_set_timings(struct omap_dss_device *dssdev,

			struct omap_video_timings *timings)

{

	DSSDBG("dpi_set_timings\n");

	dssdev->panel.timings = *timings;

	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {

		dpi_set_mode(dssdev);

		dispc_go(OMAP_DSS_CHANNEL_LCD);

	}

}

static int dpi_check_timings(struct omap_dss_device *dssdev,

			struct omap_video_timings *timings)

{

	bool is_tft;

	int r;

	int lck_div, pck_div;

	unsigned long fck;

	unsigned long pck;

	if (!dispc_lcd_timings_ok(timings))

		return -EINVAL;

	if (timings->pixel_clock == 0)

		return -EINVAL;

	is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;

#ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL

	{

		struct dsi_clock_info dsi_cinfo;

		struct dispc_clock_info dispc_cinfo;

		r = dsi_pll_calc_clock_div_pck(is_tft,

				timings->pixel_clock * 1000,

				&dsi_cinfo, &dispc_cinfo);

		if (r)

			return r;

		fck = dsi_cinfo.dsi1_pll_fclk;

		lck_div = dispc_cinfo.lck_div;

		pck_div = dispc_cinfo.pck_div;

	}

#else

	{

		struct dss_clock_info dss_cinfo;

		struct dispc_clock_info dispc_cinfo;

		r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,

				&dss_cinfo, &dispc_cinfo);

		if (r)

			return r;

		fck = dss_cinfo.fck;

		lck_div = dispc_cinfo.lck_div;

		pck_div = dispc_cinfo.pck_div;

	}

#endif

	pck = fck / lck_div / pck_div / 1000;

	timings->pixel_clock = pck;

	return 0;

}

static void dpi_get_timings(struct omap_dss_device *dssdev,

			struct omap_video_timings *timings)

{

	*timings = dssdev->panel.timings;

}

static int dpi_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);

		dpi.update_enabled = 0;

	} else {

		dispc_enable_lcd_out(1);

		dpi.update_enabled = 1;

	}

	return 0;

}

static enum omap_dss_update_mode dpi_display_get_update_mode(

		struct omap_dss_device *dssdev)

{

	return dpi.update_enabled ? OMAP_DSS_UPDATE_AUTO :

		OMAP_DSS_UPDATE_DISABLED;

}

int dpi_init_display(struct omap_dss_device *dssdev)

{

	DSSDBG("init_display\n");

	dssdev->enable = dpi_display_enable;

	dssdev->disable = dpi_display_disable;

	dssdev->suspend = dpi_display_suspend;

	dssdev->resume = dpi_display_resume;

	dssdev->set_timings = dpi_set_timings;

	dssdev->check_timings = dpi_check_timings;

	dssdev->get_timings = dpi_get_timings;

	dssdev->set_update_mode = dpi_display_set_update_mode;

	dssdev->get_update_mode = dpi_display_get_update_mode;

	return 0;

}

int dpi_init(void)

{

	return 0;

}

void dpi_exit(void)

{

}