path: root/drivers/video/omap2/dss/core.c

/*
 * linux/drivers/video/omap2/dss/core.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 "CORE"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/device.h>

#include <plat/display.h>
#include <plat/clock.h>

#include "dss.h"

static struct {
	struct platform_device *pdev;
	int		ctx_id;

	struct clk      *dss_ick;
	struct clk	*dss1_fck;
	struct clk	*dss2_fck;
	struct clk      *dss_54m_fck;
	struct clk	*dss_96m_fck;
	unsigned	num_clks_enabled;
} core;

static void dss_clk_enable_all_no_ctx(void);
static void dss_clk_disable_all_no_ctx(void);
static void dss_clk_enable_no_ctx(enum dss_clock clks);
static void dss_clk_disable_no_ctx(enum dss_clock clks);

static char *def_disp_name;
module_param_named(def_disp, def_disp_name, charp, 0);
MODULE_PARM_DESC(def_disp_name, "default display name");

#ifdef DEBUG
unsigned int dss_debug;
module_param_named(debug, dss_debug, bool, 0644);
#endif

/* CONTEXT */
static int dss_get_ctx_id(void)
{
	struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
	int r;

	if (!pdata->get_last_off_on_transaction_id)
		return 0;
	r = pdata->get_last_off_on_transaction_id(&core.pdev->dev);
	if (r < 0) {
		dev_err(&core.pdev->dev, "getting transaction ID failed, "
				"will force context restore\n");
		r = -1;
	}
	return r;
}

int dss_need_ctx_restore(void)
{
	int id = dss_get_ctx_id();

	if (id < 0 || id != core.ctx_id) {
		DSSDBG("ctx id %d -> id %d\n",
				core.ctx_id, id);
		core.ctx_id = id;
		return 1;
	} else {
		return 0;
	}
}

static void save_all_ctx(void)
{
	DSSDBG("save context\n");

	dss_clk_enable_no_ctx(DSS_CLK_ICK | DSS_CLK_FCK1);

	dss_save_context();
	dispc_save_context();
#ifdef CONFIG_OMAP2_DSS_DSI
	dsi_save_context();
#endif

	dss_clk_disable_no_ctx(DSS_CLK_ICK | DSS_CLK_FCK1);
}

static void restore_all_ctx(void)
{
	DSSDBG("restore context\n");

	dss_clk_enable_all_no_ctx();

	dss_restore_context();
	dispc_restore_context();
#ifdef CONFIG_OMAP2_DSS_DSI
	dsi_restore_context();
#endif

	dss_clk_disable_all_no_ctx();
}

/* CLOCKS */
static void core_dump_clocks(struct seq_file *s)
{
	int i;
	struct clk *clocks[5] = {
		core.dss_ick,
		core.dss1_fck,
		core.dss2_fck,
		core.dss_54m_fck,
		core.dss_96m_fck
	};

	seq_printf(s, "- CORE -\n");

	seq_printf(s, "internal clk count\t\t%u\n", core.num_clks_enabled);

	for (i = 0; i < 5; i++) {
		if (!clocks[i])
			continue;
		seq_printf(s, "%-15s\t%lu\t%d\n",
				clocks[i]->name,
				clk_get_rate(clocks[i]),
				clocks[i]->usecount);
	}
}

static int dss_get_clock(struct clk **clock, const char *clk_name)
{
	struct clk *clk;

	clk = clk_get(&core.pdev->dev, clk_name);

	if (IS_ERR(clk)) {
		DSSERR("can't get clock %s", clk_name);
		return PTR_ERR(clk);
	}

	*clock = clk;

	DSSDBG("clk %s, rate %ld\n", clk_name, clk_get_rate(clk));

	return 0;
}

static int dss_get_clocks(void)
{
	int r;

	core.dss_ick = NULL;
	core.dss1_fck = NULL;
	core.dss2_fck = NULL;
	core.dss_54m_fck = NULL;
	core.dss_96m_fck = NULL;

	r = dss_get_clock(&core.dss_ick, "ick");
	if (r)
		goto err;

	r = dss_get_clock(&core.dss1_fck, "dss1_fck");
	if (r)
		goto err;

	r = dss_get_clock(&core.dss2_fck, "dss2_fck");
	if (r)
		goto err;

	r = dss_get_clock(&core.dss_54m_fck, "tv_fck");
	if (r)
		goto err;

	r = dss_get_clock(