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

/*
 * linux/drivers/video/omap2/dss/rfbi.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 "RFBI"

#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/kfifo.h>
#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/seq_file.h>

#include <plat/display.h>
#include "dss.h"

/*#define MEASURE_PERF*/

#define RFBI_BASE               0x48050800

struct rfbi_reg { u16 idx; };

#define RFBI_REG(idx)		((const struct rfbi_reg) { idx })

#define RFBI_REVISION		RFBI_REG(0x0000)
#define RFBI_SYSCONFIG		RFBI_REG(0x0010)
#define RFBI_SYSSTATUS		RFBI_REG(0x0014)
#define RFBI_CONTROL		RFBI_REG(0x0040)
#define RFBI_PIXEL_CNT		RFBI_REG(0x0044)
#define RFBI_LINE_NUMBER	RFBI_REG(0x0048)
#define RFBI_CMD		RFBI_REG(0x004c)
#define RFBI_PARAM		RFBI_REG(0x0050)
#define RFBI_DATA		RFBI_REG(0x0054)
#define RFBI_READ		RFBI_REG(0x0058)
#define RFBI_STATUS		RFBI_REG(0x005c)

#define RFBI_CONFIG(n)		RFBI_REG(0x0060 + (n)*0x18)
#define RFBI_ONOFF_TIME(n)	RFBI_REG(0x0064 + (n)*0x18)
#define RFBI_CYCLE_TIME(n)	RFBI_REG(0x0068 + (n)*0x18)
#define RFBI_DATA_CYCLE1(n)	RFBI_REG(0x006c + (n)*0x18)
#define RFBI_DATA_CYCLE2(n)	RFBI_REG(0x0070 + (n)*0x18)
#define RFBI_DATA_CYCLE3(n)	RFBI_REG(0x0074 + (n)*0x18)

#define RFBI_VSYNC_WIDTH	RFBI_REG(0x0090)
#define RFBI_HSYNC_WIDTH	RFBI_REG(0x0094)

#define RFBI_CMD_FIFO_LEN_BYTES (16 * sizeof(struct update_param))

#define REG_FLD_MOD(idx, val, start, end) \
	rfbi_write_reg(idx, FLD_MOD(rfbi_read_reg(idx), val, start, end))

/* To work around an RFBI transfer rate limitation */
#define OMAP_RFBI_RATE_LIMIT    1

enum omap_rfbi_cycleformat {
	OMAP_DSS_RFBI_CYCLEFORMAT_1_1 = 0,
	OMAP_DSS_RFBI_CYCLEFORMAT_2_1 = 1,
	OMAP_DSS_RFBI_CYCLEFORMAT_3_1 = 2,
	OMAP_DSS_RFBI_CYCLEFORMAT_3_2 = 3,
};

enum omap_rfbi_datatype {
	OMAP_DSS_RFBI_DATATYPE_12 = 0,
	OMAP_DSS_RFBI_DATATYPE_16 = 1,
	OMAP_DSS_RFBI_DATATYPE_18 = 2,
	OMAP_DSS_RFBI_DATATYPE_24 = 3,
};

enum omap_rfbi_parallelmode {
	OMAP_DSS_RFBI_PARALLELMODE_8 = 0,
	OMAP_DSS_RFBI_PARALLELMODE_9 = 1,
	OMAP_DSS_RFBI_PARALLELMODE_12 = 2,
	OMAP_DSS_RFBI_PARALLELMODE_16 = 3,
};

enum update_cmd {
	RFBI_CMD_UPDATE = 0,
	RFBI_CMD_SYNC   = 1,
};

static int rfbi_convert_timings(struct rfbi_timings *t);
static void rfbi_get_clk_info(u32 *clk_period, u32 *max_clk_div);
static void process_cmd_fifo(void);

static struct {
	void __iomem	*base;

	unsigned long	l4_khz;

	enum omap_rfbi_datatype datatype;
	enum omap_rfbi_parallelmode parallelmode;

	enum omap_rfbi_te_mode te_mode;
	int te_enabled;

	void (*framedone_callback)(void *data);
	void *framedone_callback_data;

	struct omap_dss_device *dssdev[2];

	struct kfifo      cmd_fifo;