drivers/video/exynos/exynos_mipi_dsi_common.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2012 Samsung Electronics
  *
  * Author: InKi Dae <inki.dae@samsung.com>
  * Author: Donghwa Lee <dh09.lee@samsung.com>
  */

 #include <common.h>
 #include <lcd.h>
 #include <log.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <asm/arch/dsim.h>
 #include <asm/arch/mipi_dsim.h>

 #include "exynos_mipi_dsi_lowlevel.h"

 #define MHZ			(1000 * 1000)
 #define FIN_HZ			(24 * MHZ)

 #define DFIN_PLL_MIN_HZ		(6 * MHZ)
 #define DFIN_PLL_MAX_HZ		(12 * MHZ)

 #define DFVCO_MIN_HZ		(500 * MHZ)
 #define DFVCO_MAX_HZ		(1000 * MHZ)

 #define TRY_GET_FIFO_TIMEOUT	(5000 * 2)

 /* MIPI-DSIM status types. */
 enum {
 	DSIM_STATE_INIT,	/* should be initialized. */
 	DSIM_STATE_STOP,	/* CPU and LCDC are LP mode. */
 	DSIM_STATE_HSCLKEN,	/* HS clock was enabled. */
 	DSIM_STATE_ULPS
 };

 /* define DSI lane types. */
 enum {
 	DSIM_LANE_CLOCK = (1 << 0),
 	DSIM_LANE_DATA0 = (1 << 1),
 	DSIM_LANE_DATA1 = (1 << 2),
 	DSIM_LANE_DATA2 = (1 << 3),
 	DSIM_LANE_DATA3 = (1 << 4)
 };

 static unsigned int dpll_table[15] = {
 	100, 120, 170, 220, 270,
 	320, 390, 450, 510, 560,
 	640, 690, 770, 870, 950
 };

 static void exynos_mipi_dsi_long_data_wr(struct mipi_dsim_device *dsim,
 		const unsigned char *data0, unsigned int data1)
 {
 	unsigned int data_cnt = 0, payload = 0;

 	/* in case that data count is more then 4 */
 	for (data_cnt = 0; data_cnt < data1; data_cnt += 4) {
 		/*
 		 * after sending 4bytes per one time,
 		 * send remainder data less then 4.
 		 */
 		if ((data1 - data_cnt) < 4) {
 			if ((data1 - data_cnt) == 3) {
 				payload = data0[data_cnt] |
 					data0[data_cnt + 1] << 8 |
 					data0[data_cnt + 2] << 16;
 			debug("count = 3 payload = %x, %x %x %x\n",
 				payload, data0[data_cnt],
 				data0[data_cnt + 1],
 				data0[data_cnt + 2]);
 			} else if ((data1 - data_cnt) == 2) {
 				payload = data0[data_cnt] |
 					data0[data_cnt + 1] << 8;
 			debug("count = 2 payload = %x, %x %x\n", payload,
 				data0[data_cnt], data0[data_cnt + 1]);
 			} else if ((data1 - data_cnt) == 1) {
 				payload = data0[data_cnt];
 			}
 		} else {
 			/* send 4bytes per one time. */
 			payload = data0[data_cnt] |
 				data0[data_cnt + 1] << 8 |
 				data0[data_cnt + 2] << 16 |
 				data0[data_cnt + 3] << 24;

 			debug("count = 4 payload = %x, %x %x %x %x\n",
 				payload, *(u8 *)(data0 + data_cnt),
 				data0[data_cnt + 1],
 				data0[data_cnt + 2],
 				data0[data_cnt + 3]);
 		}
 		exynos_mipi_dsi_wr_tx_data(dsim, payload);
 	}
 }

 int exynos_mipi_dsi_wr_data(struct mipi_dsim_device *dsim, unsigned int data_id,
 	const unsigned char *data0, unsigned int data1)
 {
 	unsigned int timeout = TRY_GET_FIFO_TIMEOUT;
 	unsigned long delay_val, delay;
 	unsigned int check_rx_ack = 0;

 	if (dsim->state == DSIM_STATE_ULPS) {
 		debug("state is ULPS.\n");

 		return -EINVAL;
 	}

 	delay_val = MHZ / dsim->dsim_config->esc_clk;
 	delay = 10 * delay_val;

 	mdelay(delay);

 	/* only if transfer mode is LPDT, wait SFR becomes empty. */
 	if (dsim->state == DSIM_STATE_STOP) {
 		while (!(exynos_mipi_dsi_get_fifo_state(dsim) &
 				SFR_HEADER_EMPTY)) {
 			if ((timeout--) > 0)
 				mdelay(1);
 			else {
 				debug("SRF header fifo is not empty.\n");
 				return -EINVAL;
 			}
 		}
 	}

 	switch (data_id) {
 	/* short packet types of packet types for command. */
 	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
 	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
 	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
 	case MIPI_DSI_DCS_SHORT_WRITE:
 	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
 	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
 		debug("data0 = %x data1 = %x\n",
 				data0[0], data0[1]);
 		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
 		if (check_rx_ack) {
 			/* process response func should be implemented */
 			return 0;
 		} else {
 			return -EINVAL;
 		}

 	/* general command */
 	case MIPI_DSI_COLOR_MODE_OFF:
 	case MIPI_DSI_COLOR_MODE_ON:
 	case MIPI_DSI_SHUTDOWN_PERIPHERAL:
 	case MIPI_DSI_TURN_ON_PERIPHERAL:
 		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
 		if (check_rx_ack) {
 			/* process response func should be implemented. */
 			return 0;
 		} else {
 			return -EINVAL;
 		}

 	/* packet types for video data */
 	case MIPI_DSI_V_SYNC_START:
 	case MIPI_DSI_V_SYNC_END:
 	case MIPI_DSI_H_SYNC_START:
 	case MIPI_DSI_H_SYNC_END:
 	case MIPI_DSI_END_OF_TRANSMISSION:
 		return 0;

 	/* short and response packet types for command */
 	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
 	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
 	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
 	case MIPI_DSI_DCS_READ:
 		exynos_mipi_dsi_clear_all_interrupt(dsim);
 		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
 		/* process response func should be implemented. */
 		return 0;

 	/* long packet type and null packet */
 	case MIPI_DSI_NULL_PACKET:
 	case MIPI_DSI_BLANKING_PACKET:
 		return 0;
 	case MIPI_DSI_GENERIC_LONG_WRITE:
 	case MIPI_DSI_DCS_LONG_WRITE:
 	{
 		unsigned int payload = 0;

 		/* if data count is less then 4, then send 3bytes data.  */
 		if (data1 < 4) {
 			payload = data0[0] |
 				data0[1] << 8 |
 				data0[2] << 16;

 			exynos_mipi_dsi_wr_tx_data(dsim, payload);

 			debug("count = %d payload = %x,%x %x %x\n",
 				data1, payload, data0[0],
 				data0[1], data0[2]);
 		} else {
 			/* in case that data count is more then 4 */
 			exynos_mipi_dsi_long_data_wr(dsim, data0, data1);
 		}

 		/* put data into header fifo */
 		exynos_mipi_dsi_wr_tx_header(dsim, data_id, data1 & 0xff,
 			(data1 & 0xff00) >> 8);

 	}
 	if (check_rx_ack)
 		/* process response func should be implemented. */
 		return 0;
 	else
 		return -EINVAL;

 	/* packet typo for video data */
 	case MIPI_DSI_PACKED_PIXEL_STREAM_16:
 	case MIPI_DSI_PACKED_PIXEL_STREAM_18:
 	case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
 	case MIPI_DSI_PACKED_PIXEL_STREAM_24:
 		if (check_rx_ack) {
 			/* process response func should be implemented. */
 			return 0;
 		} else {
 			return -EINVAL;
 		}
 	default:
 		debug("data id %x is not supported current DSI spec.\n",
 			data_id);

 		return -EINVAL;
 	}

 	return 0;
 }

 int exynos_mipi_dsi_pll_on(struct mipi_dsim_device *dsim, unsigned int enable)
 {
 	int sw_timeout;

 	if (enable) {
 		sw_timeout = 1000;

 		exynos_mipi_dsi_clear_interrupt(dsim);
 		exynos_mipi_dsi_enable_pll(dsim, 1);
 		while (1) {
 			sw_timeout--;
 			if (exynos_mipi_dsi_is_pll_stable(dsim))
 				return 0;
 			if (sw_timeout == 0)
 				return -EINVAL;
 		}
 	} else
 		exynos_mipi_dsi_enable_pll(dsim, 0);

 	return 0;
 }

 unsigned long exynos_mipi_dsi_change_pll(struct mipi_dsim_device *dsim,
 	unsigned int pre_divider, unsigned int main_divider,
 	unsigned int scaler)
 {
 	unsigned long dfin_pll, dfvco, dpll_out;
 	unsigned int i, freq_band = 0xf;

 	dfin_pll = (FIN_HZ / pre_divider);

 	/******************************************************
 	 *	Serial Clock(=ByteClk X 8)	FreqBand[3:0] *
 	 ******************************************************
 	 *	~ 99.99 MHz			0000
 	 *	100 ~ 119.99 MHz		0001
 	 *	120 ~ 159.99 MHz		0010
 	 *	160 ~ 199.99 MHz		0011
 	 *	200 ~ 239.99 MHz		0100
 	 *	140 ~ 319.99 MHz		0101
 	 *	320 ~ 389.99 MHz		0110
 	 *	390 ~ 449.99 MHz		0111
 	 *	450 ~ 509.99 MHz		1000
 	 *	510 ~ 559.99 MHz		1001
 	 *	560 ~ 639.99 MHz		1010
 	 *	640 ~ 689.99 MHz		1011
 	 *	690 ~ 769.99 MHz		1100
 	 *	770 ~ 869.99 MHz		1101
 	 *	870 ~ 949.99 MHz		1110
 	 *	950 ~ 1000 MHz			1111
 	 ******************************************************/
 	if (dfin_pll < DFIN_PLL_MIN_HZ || dfin_pll > DFIN_PLL_MAX_HZ) {
 		debug("fin_pll range should be 6MHz ~ 12MHz\n");
 		exynos_mipi_dsi_enable_afc(dsim, 0, 0);
 	} else {
 		if (dfin_pll < 7 * MHZ)
 			exynos_mipi_dsi_enable_afc(dsim, 1, 0x1);
 		else if (dfin_pll < 8 * MHZ)
 			exynos_mipi_dsi_enable_afc(dsim, 1, 0x0);
 		else if (dfin_pll < 9 * MHZ)
 			exynos_mipi_dsi_enable_afc(dsim, 1, 0x3);
 		else if (dfin_pll < 10 * MHZ)
 			exynos_mipi_dsi_enable_afc(dsim, 1, 0x2);
 		else if (dfin_pll < 11 * MHZ)
 			exynos_mipi_dsi_enable_afc(dsim, 1, 0x5);
 		else
 			exynos_mipi_dsi_enable_afc(dsim, 1, 0x4);
 	}

 	dfvco = dfin_pll * main_divider;
 	debug("dfvco = %lu, dfin_pll = %lu, main_divider = %d\n",
 				dfvco, dfin_pll, main_divider);
 	if (dfvco < DFVCO_MIN_HZ || dfvco > DFVCO_MAX_HZ)
 		debug("fvco range should be 500MHz ~ 1000MHz\n");

 	dpll_out = dfvco / (1 << scaler);
 	debug("dpll_out = %lu, dfvco = %lu, scaler = %d\n",
 		dpll_out, dfvco, scaler);

 	for (i = 0; i < ARRAY_SIZE(dpll_table); i++) {
 		if (dpll_out < dpll_table[i] * MHZ) {
 			freq_band = i;
 			break;
 		}
 	}

 	debug("freq_band = %d\n", freq_band);

 	exynos_mipi_dsi_pll_freq(dsim, pre_divider, main_divider, scaler);

 	exynos_mipi_dsi_hs_zero_ctrl(dsim, 0);
 	exynos_mipi_dsi_prep_ctrl(dsim, 0);

 	/* Freq Band */
 	exynos_mipi_dsi_pll_freq_band(dsim, freq_band);

 	/* Stable time */
 	exynos_mipi_dsi_pll_stable_time(dsim,
 				dsim->dsim_config->pll_stable_time);

 	/* Enable PLL */
 	debug("FOUT of mipi dphy pll is %luMHz\n",
 		(dpll_out / MHZ));

 	return dpll_out;
 }

 int exynos_mipi_dsi_set_clock(struct mipi_dsim_device *dsim,
 	unsigned int byte_clk_sel, unsigned int enable)
 {
 	unsigned int esc_div;
 	unsigned long esc_clk_error_rate;
 	unsigned long hs_clk = 0, byte_clk = 0, escape_clk = 0;

 	if (enable) {
 		dsim->e_clk_src = byte_clk_sel;

 		/* Escape mode clock and byte clock source */
 		exynos_mipi_dsi_set_byte_clock_src(dsim, byte_clk_sel);

 		/* DPHY, DSIM Link : D-PHY clock out */
 		if (byte_clk_sel == DSIM_PLL_OUT_DIV8) {
 			hs_clk = exynos_mipi_dsi_change_pll(dsim,
 				dsim->dsim_config->p, dsim->dsim_config->m,
 				dsim->dsim_config->s);
 			if (hs_clk == 0) {
 				debug("failed to get hs clock.\n");
 				return -EINVAL;
 			}

 			byte_clk = hs_clk / 8;
 			exynos_mipi_dsi_enable_pll_bypass(dsim, 0);
 			exynos_mipi_dsi_pll_on(dsim, 1);
 		/* DPHY : D-PHY clock out, DSIM link : external clock out */
 		} else if (byte_clk_sel == DSIM_EXT_CLK_DIV8)
 			debug("not support EXT CLK source for MIPI DSIM\n");
 		else if (byte_clk_sel == DSIM_EXT_CLK_BYPASS)
 			debug("not support EXT CLK source for MIPI DSIM\n");

 		/* escape clock divider */
 		esc_div = byte_clk / (dsim->dsim_config->esc_clk);
 		debug("esc_div = %d, byte_clk = %lu, esc_clk = %lu\n",
 			esc_div, byte_clk, dsim->dsim_config->esc_clk);
 		if ((byte_clk / esc_div) >= (20 * MHZ) ||
 			(byte_clk / esc_div) > dsim->dsim_config->esc_clk)
 			esc_div += 1;

 		escape_clk = byte_clk / esc_div;
 		debug("escape_clk = %lu, byte_clk = %lu, esc_div = %d\n",
 			escape_clk, byte_clk, esc_div);

 		/* enable escape clock. */
 		exynos_mipi_dsi_enable_byte_clock(dsim, 1);

 		/* enable byte clk and escape clock */
 		exynos_mipi_dsi_set_esc_clk_prs(dsim, 1, esc_div);
 		/* escape clock on lane */
 		exynos_mipi_dsi_enable_esc_clk_on_lane(dsim,
 			(DSIM_LANE_CLOCK | dsim->data_lane), 1);

 		debug("byte clock is %luMHz\n",
 			(byte_clk / MHZ));
 		debug("escape clock that user's need is %lu\n",
 			(dsim->dsim_config->esc_clk / MHZ));
 		debug("escape clock divider is %x\n", esc_div);
 		debug("escape clock is %luMHz\n",
 			((byte_clk / esc_div) / MHZ));

 		if ((byte_clk / esc_div) > escape_clk) {
 			esc_clk_error_rate = escape_clk /
 				(byte_clk / esc_div);
 			debug("error rate is %lu over.\n",
 				(esc_clk_error_rate / 100));
 		} else if ((byte_clk / esc_div) < (escape_clk)) {
 			esc_clk_error_rate = (byte_clk / esc_div) /
 				escape_clk;
 			debug("error rate is %lu under.\n",
 				(esc_clk_error_rate / 100));
 		}
 	} else {
 		exynos_mipi_dsi_enable_esc_clk_on_lane(dsim,
 			(DSIM_LANE_CLOCK | dsim->data_lane), 0);
 		exynos_mipi_dsi_set_esc_clk_prs(dsim, 0, 0);

 		/* disable escape clock. */
 		exynos_mipi_dsi_enable_byte_clock(dsim, 0);

 		if (byte_clk_sel == DSIM_PLL_OUT_DIV8)
 			exynos_mipi_dsi_pll_on(dsim, 0);
 	}

 	return 0;
 }

 int exynos_mipi_dsi_init_dsim(struct mipi_dsim_device *dsim)
 {
 	dsim->state = DSIM_STATE_INIT;

 	switch (dsim->dsim_config->e_no_data_lane) {
 	case DSIM_DATA_LANE_1:
 		dsim->data_lane = DSIM_LANE_DATA0;
 		break;
 	case DSIM_DATA_LANE_2:
 		dsim->data_lane = DSIM_LANE_DATA0 | DSIM_LANE_DATA1;
 		break;
 	case DSIM_DATA_LANE_3:
 		dsim->data_lane = DSIM_LANE_DATA0 | DSIM_LANE_DATA1 |
 			DSIM_LANE_DATA2;
 		break;
 	case DSIM_DATA_LANE_4:
 		dsim->data_lane = DSIM_LANE_DATA0 | DSIM_LANE_DATA1 |
 			DSIM_LANE_DATA2 | DSIM_LANE_DATA3;
 		break;
 	default:
 		debug("data lane is invalid.\n");
 		return -EINVAL;
 	};

 	exynos_mipi_dsi_sw_reset(dsim);
 	exynos_mipi_dsi_dp_dn_swap(dsim, 0);

 	return 0;
 }

 int exynos_mipi_dsi_enable_frame_done_int(struct mipi_dsim_device *dsim,
 	unsigned int enable)
 {
 	/* enable only frame done interrupt */
 	exynos_mipi_dsi_set_interrupt_mask(dsim, INTMSK_FRAME_DONE, enable);

 	return 0;
 }

 static void convert_to_fb_videomode(struct fb_videomode *mode1,
 				    struct vidinfo *mode2)
 {
 	mode1->xres = mode2->vl_width;
 	mode1->yres = mode2->vl_height;
 	mode1->upper_margin = mode2->vl_vfpd;
 	mode1->lower_margin = mode2->vl_vbpd;
 	mode1->left_margin = mode2->vl_hfpd;
 	mode1->right_margin = mode2->vl_hbpd;
 	mode1->vsync_len = mode2->vl_vspw;
 	mode1->hsync_len = mode2->vl_hspw;
 }

 int exynos_mipi_dsi_set_display_mode(struct mipi_dsim_device *dsim,
 	struct mipi_dsim_config *dsim_config)
 {
 	struct exynos_platform_mipi_dsim *dsim_pd;
 	struct fb_videomode lcd_video;
 	struct vidinfo *vid;

 	dsim_pd = (struct exynos_platform_mipi_dsim *)dsim->pd;
 	vid = (struct vidinfo *)dsim_pd->lcd_panel_info;

 	convert_to_fb_videomode(&lcd_video, vid);

 	/* in case of VIDEO MODE (RGB INTERFACE), it sets polarities. */
 	if (dsim->dsim_config->e_interface == (u32) DSIM_VIDEO) {
 		if (dsim->dsim_config->auto_vertical_cnt == 0) {
 			exynos_mipi_dsi_set_main_disp_vporch(dsim,
 				vid->vl_cmd_allow_len,
 				lcd_video.upper_margin,
 				lcd_video.lower_margin);
 			exynos_mipi_dsi_set_main_disp_hporch(dsim,
 				lcd_video.left_margin,
 				lcd_video.right_margin);
 			exynos_mipi_dsi_set_main_disp_sync_area(dsim,
 				lcd_video.vsync_len,
 				lcd_video.hsync_len);
 		}
 	}

 	exynos_mipi_dsi_set_main_disp_resol(dsim, lcd_video.xres,
 			lcd_video.yres);

 	exynos_mipi_dsi_display_config(dsim, dsim->dsim_config);

 	debug("lcd panel ==> width = %d, height = %d\n",
 			lcd_video.xres, lcd_video.yres);

 	return 0;
 }

 int exynos_mipi_dsi_init_link(struct mipi_dsim_device *dsim)
 {
 	unsigned int time_out = 100;

 	switch (dsim->state) {
 	case DSIM_STATE_INIT:
 		exynos_mipi_dsi_init_fifo_pointer(dsim, 0x1f);

 		/* dsi configuration */
 		exynos_mipi_dsi_init_config(dsim);
 		exynos_mipi_dsi_enable_lane(dsim, DSIM_LANE_CLOCK, 1);
 		exynos_mipi_dsi_enable_lane(dsim, dsim->data_lane, 1);

 		/* set clock configuration */
 		exynos_mipi_dsi_set_clock(dsim,
 					dsim->dsim_config->e_byte_clk, 1);

 		/* check clock and data lane state are stop state */
 		while (!(exynos_mipi_dsi_is_lane_state(dsim))) {
 			time_out--;
 			if (time_out == 0) {
 				debug("DSI Master is not stop state.\n");
 				debug("Check initialization process\n");

 				return -EINVAL;
 			}
 		}

 		dsim->state = DSIM_STATE_STOP;

 		/* BTA sequence counters */
 		exynos_mipi_dsi_set_stop_state_counter(dsim,
 			dsim->dsim_config->stop_holding_cnt);
 		exynos_mipi_dsi_set_bta_timeout(dsim,
 			dsim->dsim_config->bta_timeout);
 		exynos_mipi_dsi_set_lpdr_timeout(dsim,
 			dsim->dsim_config->rx_timeout);

 		return 0;
 	default:
 		debug("DSI Master is already init.\n");
 		return 0;
 	}

 	return 0;
 }

 int exynos_mipi_dsi_set_hs_enable(struct mipi_dsim_device *dsim)
 {
 	if (dsim->state == DSIM_STATE_STOP) {
 		if (dsim->e_clk_src != DSIM_EXT_CLK_BYPASS) {
 			dsim->state = DSIM_STATE_HSCLKEN;

 			 /* set LCDC and CPU transfer mode to HS. */
 			exynos_mipi_dsi_set_lcdc_transfer_mode(dsim, 0);
 			exynos_mipi_dsi_set_cpu_transfer_mode(dsim, 0);

 			exynos_mipi_dsi_enable_hs_clock(dsim, 1);

 			return 0;
 		} else
 			debug("clock source is external bypass.\n");
 	} else
 		debug("DSIM is not stop state.\n");

 	return 0;
 }

 int exynos_mipi_dsi_set_data_transfer_mode(struct mipi_dsim_device *dsim,
 		unsigned int mode)
 {
 	if (mode) {
 		if (dsim->state != DSIM_STATE_HSCLKEN) {
 			debug("HS Clock lane is not enabled.\n");
 			return -EINVAL;
 		}

 		exynos_mipi_dsi_set_lcdc_transfer_mode(dsim, 0);
 	} else {
 		if (dsim->state == DSIM_STATE_INIT || dsim->state ==
 			DSIM_STATE_ULPS) {
 			debug("DSI Master is not STOP or HSDT state.\n");
 			return -EINVAL;
 		}

 		exynos_mipi_dsi_set_cpu_transfer_mode(dsim, 0);
 	}

 	return 0;
 }

 int exynos_mipi_dsi_get_frame_done_status(struct mipi_dsim_device *dsim)
 {
 	return _exynos_mipi_dsi_get_frame_done_status(dsim);
 }

 int exynos_mipi_dsi_clear_frame_done(struct mipi_dsim_device *dsim)
 {
 	_exynos_mipi_dsi_clear_frame_done(dsim);

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2012 Samsung Electronics
	*
	* Author: InKi Dae <inki.dae@samsung.com>
	* Author: Donghwa Lee <dh09.lee@samsung.com>
	*/

	#include <common.h>
	#include <lcd.h>
	#include <log.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <asm/arch/dsim.h>
	#include <asm/arch/mipi_dsim.h>

	#include "exynos_mipi_dsi_lowlevel.h"

	#define MHZ (1000 * 1000)
	#define FIN_HZ (24 * MHZ)

	#define DFIN_PLL_MIN_HZ (6 * MHZ)
	#define DFIN_PLL_MAX_HZ (12 * MHZ)

	#define DFVCO_MIN_HZ (500 * MHZ)
	#define DFVCO_MAX_HZ (1000 * MHZ)

	#define TRY_GET_FIFO_TIMEOUT (5000 * 2)

	/* MIPI-DSIM status types. */
	enum {
	DSIM_STATE_INIT, /* should be initialized. */
	DSIM_STATE_STOP, /* CPU and LCDC are LP mode. */
	DSIM_STATE_HSCLKEN, /* HS clock was enabled. */
	DSIM_STATE_ULPS
	};

	/* define DSI lane types. */
	enum {
	DSIM_LANE_CLOCK = (1 << 0),
	DSIM_LANE_DATA0 = (1 << 1),
	DSIM_LANE_DATA1 = (1 << 2),
	DSIM_LANE_DATA2 = (1 << 3),
	DSIM_LANE_DATA3 = (1 << 4)
	};

	static unsigned int dpll_table[15] = {
	100, 120, 170, 220, 270,
	320, 390, 450, 510, 560,
	640, 690, 770, 870, 950
	};

	static void exynos_mipi_dsi_long_data_wr(struct mipi_dsim_device *dsim,
	const unsigned char *data0, unsigned int data1)
	{
	unsigned int data_cnt = 0, payload = 0;

	/* in case that data count is more then 4 */
	for (data_cnt = 0; data_cnt < data1; data_cnt += 4) {
	/*
	* after sending 4bytes per one time,
	* send remainder data less then 4.
	*/
	if ((data1 - data_cnt) < 4) {
	if ((data1 - data_cnt) == 3) {
	payload = data0[data_cnt] \|
	data0[data_cnt + 1] << 8 \|
	data0[data_cnt + 2] << 16;
	debug("count = 3 payload = %x, %x %x %x\n",
	payload, data0[data_cnt],
	data0[data_cnt + 1],
	data0[data_cnt + 2]);
	} else if ((data1 - data_cnt) == 2) {
	payload = data0[data_cnt] \|
	data0[data_cnt + 1] << 8;
	debug("count = 2 payload = %x, %x %x\n", payload,
	data0[data_cnt], data0[data_cnt + 1]);
	} else if ((data1 - data_cnt) == 1) {
	payload = data0[data_cnt];
	}
	} else {
	/* send 4bytes per one time. */
	payload = data0[data_cnt] \|
	data0[data_cnt + 1] << 8 \|
	data0[data_cnt + 2] << 16 \|
	data0[data_cnt + 3] << 24;

	debug("count = 4 payload = %x, %x %x %x %x\n",
	payload, (u8 )(data0 + data_cnt),
	data0[data_cnt + 1],
	data0[data_cnt + 2],
	data0[data_cnt + 3]);
	}
	exynos_mipi_dsi_wr_tx_data(dsim, payload);
	}
	}

	int exynos_mipi_dsi_wr_data(struct mipi_dsim_device *dsim, unsigned int data_id,
	const unsigned char *data0, unsigned int data1)
	{
	unsigned int timeout = TRY_GET_FIFO_TIMEOUT;
	unsigned long delay_val, delay;
	unsigned int check_rx_ack = 0;

	if (dsim->state == DSIM_STATE_ULPS) {
	debug("state is ULPS.\n");

	return -EINVAL;
	}

	delay_val = MHZ / dsim->dsim_config->esc_clk;
	delay = 10 * delay_val;

	mdelay(delay);

	/* only if transfer mode is LPDT, wait SFR becomes empty. */
	if (dsim->state == DSIM_STATE_STOP) {
	while (!(exynos_mipi_dsi_get_fifo_state(dsim) &
	SFR_HEADER_EMPTY)) {
	if ((timeout--) > 0)
	mdelay(1);
	else {
	debug("SRF header fifo is not empty.\n");
	return -EINVAL;
	}
	}
	}

	switch (data_id) {
	/* short packet types of packet types for command. */
	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
	case MIPI_DSI_DCS_SHORT_WRITE:
	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
	debug("data0 = %x data1 = %x\n",
	data0[0], data0[1]);
	exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
	if (check_rx_ack) {
	/* process response func should be implemented */
	return 0;
	} else {
	return -EINVAL;
	}

	/* general command */
	case MIPI_DSI_COLOR_MODE_OFF:
	case MIPI_DSI_COLOR_MODE_ON:
	case MIPI_DSI_SHUTDOWN_PERIPHERAL:
	case MIPI_DSI_TURN_ON_PERIPHERAL:
	exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
	if (check_rx_ack) {
	/* process response func should be implemented. */
	return 0;
	} else {
	return -EINVAL;
	}

	/* packet types for video data */
	case MIPI_DSI_V_SYNC_START:
	case MIPI_DSI_V_SYNC_END:
	case MIPI_DSI_H_SYNC_START:
	case MIPI_DSI_H_SYNC_END:
	case MIPI_DSI_END_OF_TRANSMISSION:
	return 0;

	/* short and response packet types for command */
	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
	case MIPI_DSI_DCS_READ:
	exynos_mipi_dsi_clear_all_interrupt(dsim);
	exynos_mipi_dsi_wr_tx_header(dsim, data_id, data0[0], data0[1]);
	/* process response func should be implemented. */
	return 0;

	/* long packet type and null packet */
	case MIPI_DSI_NULL_PACKET:
	case MIPI_DSI_BLANKING_PACKET:
	return 0;
	case MIPI_DSI_GENERIC_LONG_WRITE:
	case MIPI_DSI_DCS_LONG_WRITE:
	{
	unsigned int payload = 0;

	/* if data count is less then 4, then send 3bytes data. */
	if (data1 < 4) {
	payload = data0[0] \|
	data0[1] << 8 \|
	data0[2] << 16;

	exynos_mipi_dsi_wr_tx_data(dsim, payload);

	debug("count = %d payload = %x,%x %x %x\n",
	data1, payload, data0[0],
	data0[1], data0[2]);
	} else {
	/* in case that data count is more then 4 */
	exynos_mipi_dsi_long_data_wr(dsim, data0, data1);
	}

	/* put data into header fifo */
	exynos_mipi_dsi_wr_tx_header(dsim, data_id, data1 & 0xff,
	(data1 & 0xff00) >> 8);

	}
	if (check_rx_ack)
	/* process response func should be implemented. */
	return 0;
	else
	return -EINVAL;

	/* packet typo for video data */
	case MIPI_DSI_PACKED_PIXEL_STREAM_16:
	case MIPI_DSI_PACKED_PIXEL_STREAM_18:
	case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
	case MIPI_DSI_PACKED_PIXEL_STREAM_24:
	if (check_rx_ack) {
	/* process response func should be implemented. */
	return 0;
	} else {
	return -EINVAL;
	}
	default:
	debug("data id %x is not supported current DSI spec.\n",
	data_id);

	return -EINVAL;
	}

	return 0;
	}

	int exynos_mipi_dsi_pll_on(struct mipi_dsim_device *dsim, unsigned int enable)
	{
	int sw_timeout;

	if (enable) {
	sw_timeout = 1000;

	exynos_mipi_dsi_clear_interrupt(dsim);
	exynos_mipi_dsi_enable_pll(dsim, 1);
	while (1) {
	sw_timeout--;
	if (exynos_mipi_dsi_is_pll_stable(dsim))
	return 0;
	if (sw_timeout == 0)
	return -EINVAL;
	}
	} else
	exynos_mipi_dsi_enable_pll(dsim, 0);

	return 0;
	}

	unsigned long exynos_mipi_dsi_change_pll(struct mipi_dsim_device *dsim,
	unsigned int pre_divider, unsigned int main_divider,
	unsigned int scaler)
	{
	unsigned long dfin_pll, dfvco, dpll_out;
	unsigned int i, freq_band = 0xf;

	dfin_pll = (FIN_HZ / pre_divider);

	/******************************************************
	* Serial Clock(=ByteClk X 8) FreqBand[3:0] *
	******************************************************
	* ~ 99.99 MHz 0000
	* 100 ~ 119.99 MHz 0001
	* 120 ~ 159.99 MHz 0010
	* 160 ~ 199.99 MHz 0011
	* 200 ~ 239.99 MHz 0100
	* 140 ~ 319.99 MHz 0101
	* 320 ~ 389.99 MHz 0110
	* 390 ~ 449.99 MHz 0111
	* 450 ~ 509.99 MHz 1000
	* 510 ~ 559.99 MHz 1001
	* 560 ~ 639.99 MHz 1010
	* 640 ~ 689.99 MHz 1011
	* 690 ~ 769.99 MHz 1100
	* 770 ~ 869.99 MHz 1101
	* 870 ~ 949.99 MHz 1110
	* 950 ~ 1000 MHz 1111
	******************************************************/
	if (dfin_pll < DFIN_PLL_MIN_HZ \|\| dfin_pll > DFIN_PLL_MAX_HZ) {
	debug("fin_pll range should be 6MHz ~ 12MHz\n");
	exynos_mipi_dsi_enable_afc(dsim, 0, 0);
	} else {
	if (dfin_pll < 7 * MHZ)
	exynos_mipi_dsi_enable_afc(dsim, 1, 0x1);
	else if (dfin_pll < 8 * MHZ)
	exynos_mipi_dsi_enable_afc(dsim, 1, 0x0);
	else if (dfin_pll < 9 * MHZ)
	exynos_mipi_dsi_enable_afc(dsim, 1, 0x3);
	else if (dfin_pll < 10 * MHZ)
	exynos_mipi_dsi_enable_afc(dsim, 1, 0x2);
	else if (dfin_pll < 11 * MHZ)
	exynos_mipi_dsi_enable_afc(dsim, 1, 0x5);
	else
	exynos_mipi_dsi_enable_afc(dsim, 1, 0x4);
	}

	dfvco = dfin_pll * main_divider;
	debug("dfvco = %lu, dfin_pll = %lu, main_divider = %d\n",
	dfvco, dfin_pll, main_divider);
	if (dfvco < DFVCO_MIN_HZ \|\| dfvco > DFVCO_MAX_HZ)
	debug("fvco range should be 500MHz ~ 1000MHz\n");

	dpll_out = dfvco / (1 << scaler);
	debug("dpll_out = %lu, dfvco = %lu, scaler = %d\n",
	dpll_out, dfvco, scaler);

	for (i = 0; i < ARRAY_SIZE(dpll_table); i++) {
	if (dpll_out < dpll_table[i] * MHZ) {
	freq_band = i;
	break;
	}
	}

	debug("freq_band = %d\n", freq_band);

	exynos_mipi_dsi_pll_freq(dsim, pre_divider, main_divider, scaler);

	exynos_mipi_dsi_hs_zero_ctrl(dsim, 0);
	exynos_mipi_dsi_prep_ctrl(dsim, 0);

	/* Freq Band */
	exynos_mipi_dsi_pll_freq_band(dsim, freq_band);

	/* Stable time */
	exynos_mipi_dsi_pll_stable_time(dsim,
	dsim->dsim_config->pll_stable_time);

	/* Enable PLL */
	debug("FOUT of mipi dphy pll is %luMHz\n",
	(dpll_out / MHZ));

	return dpll_out;
	}

	int exynos_mipi_dsi_set_clock(struct mipi_dsim_device *dsim,
	unsigned int byte_clk_sel, unsigned int enable)
	{
	unsigned int esc_div;
	unsigned long esc_clk_error_rate;
	unsigned long hs_clk = 0, byte_clk = 0, escape_clk = 0;

	if (enable) {
	dsim->e_clk_src = byte_clk_sel;

	/* Escape mode clock and byte clock source */
	exynos_mipi_dsi_set_byte_clock_src(dsim, byte_clk_sel);

	/* DPHY, DSIM Link : D-PHY clock out */
	if (byte_clk_sel == DSIM_PLL_OUT_DIV8) {
	hs_clk = exynos_mipi_dsi_change_pll(dsim,
	dsim->dsim_config->p, dsim->dsim_config->m,
	dsim->dsim_config->s);
	if (hs_clk == 0) {
	debug("failed to get hs clock.\n");
	return -EINVAL;
	}

	byte_clk = hs_clk / 8;
	exynos_mipi_dsi_enable_pll_bypass(dsim, 0);
	exynos_mipi_dsi_pll_on(dsim, 1);
	/* DPHY : D-PHY clock out, DSIM link : external clock out */
	} else if (byte_clk_sel == DSIM_EXT_CLK_DIV8)
	debug("not support EXT CLK source for MIPI DSIM\n");
	else if (byte_clk_sel == DSIM_EXT_CLK_BYPASS)
	debug("not support EXT CLK source for MIPI DSIM\n");

	/* escape clock divider */
	esc_div = byte_clk / (dsim->dsim_config->esc_clk);
	debug("esc_div = %d, byte_clk = %lu, esc_clk = %lu\n",
	esc_div, byte_clk, dsim->dsim_config->esc_clk);
	if ((byte_clk / esc_div) >= (20 * MHZ) \|\|
	(byte_clk / esc_div) > dsim->dsim_config->esc_clk)
	esc_div += 1;

	escape_clk = byte_clk / esc_div;
	debug("escape_clk = %lu, byte_clk = %lu, esc_div = %d\n",
	escape_clk, byte_clk, esc_div);

	/* enable escape clock. */
	exynos_mipi_dsi_enable_byte_clock(dsim, 1);

	/* enable byte clk and escape clock */
	exynos_mipi_dsi_set_esc_clk_prs(dsim, 1, esc_div);
	/* escape clock on lane */
	exynos_mipi_dsi_enable_esc_clk_on_lane(dsim,
	(DSIM_LANE_CLOCK \| dsim->data_lane), 1);

	debug("byte clock is %luMHz\n",
	(byte_clk / MHZ));
	debug("escape clock that user's need is %lu\n",
	(dsim->dsim_config->esc_clk / MHZ));
	debug("escape clock divider is %x\n", esc_div);
	debug("escape clock is %luMHz\n",
	((byte_clk / esc_div) / MHZ));

	if ((byte_clk / esc_div) > escape_clk) {
	esc_clk_error_rate = escape_clk /
	(byte_clk / esc_div);
	debug("error rate is %lu over.\n",
	(esc_clk_error_rate / 100));
	} else if ((byte_clk / esc_div) < (escape_clk)) {
	esc_clk_error_rate = (byte_clk / esc_div) /
	escape_clk;
	debug("error rate is %lu under.\n",
	(esc_clk_error_rate / 100));
	}
	} else {
	exynos_mipi_dsi_enable_esc_clk_on_lane(dsim,
	(DSIM_LANE_CLOCK \| dsim->data_lane), 0);
	exynos_mipi_dsi_set_esc_clk_prs(dsim, 0, 0);

	/* disable escape clock. */
	exynos_mipi_dsi_enable_byte_clock(dsim, 0);

	if (byte_clk_sel == DSIM_PLL_OUT_DIV8)
	exynos_mipi_dsi_pll_on(dsim, 0);
	}

	return 0;
	}

	int exynos_mipi_dsi_init_dsim(struct mipi_dsim_device *dsim)
	{
	dsim->state = DSIM_STATE_INIT;

	switch (dsim->dsim_config->e_no_data_lane) {
	case DSIM_DATA_LANE_1:
	dsim->data_lane = DSIM_LANE_DATA0;
	break;
	case DSIM_DATA_LANE_2:
	dsim->data_lane = DSIM_LANE_DATA0 \| DSIM_LANE_DATA1;
	break;
	case DSIM_DATA_LANE_3:
	dsim->data_lane = DSIM_LANE_DATA0 \| DSIM_LANE_DATA1 \|
	DSIM_LANE_DATA2;
	break;
	case DSIM_DATA_LANE_4:
	dsim->data_lane = DSIM_LANE_DATA0 \| DSIM_LANE_DATA1 \|
	DSIM_LANE_DATA2 \| DSIM_LANE_DATA3;
	break;
	default:
	debug("data lane is invalid.\n");
	return -EINVAL;
	};

	exynos_mipi_dsi_sw_reset(dsim);
	exynos_mipi_dsi_dp_dn_swap(dsim, 0);

	return 0;
	}

	int exynos_mipi_dsi_enable_frame_done_int(struct mipi_dsim_device *dsim,
	unsigned int enable)
	{
	/* enable only frame done interrupt */
	exynos_mipi_dsi_set_interrupt_mask(dsim, INTMSK_FRAME_DONE, enable);

	return 0;
	}

	static void convert_to_fb_videomode(struct fb_videomode *mode1,
	struct vidinfo *mode2)
	{
	mode1->xres = mode2->vl_width;
	mode1->yres = mode2->vl_height;
	mode1->upper_margin = mode2->vl_vfpd;
	mode1->lower_margin = mode2->vl_vbpd;
	mode1->left_margin = mode2->vl_hfpd;
	mode1->right_margin = mode2->vl_hbpd;
	mode1->vsync_len = mode2->vl_vspw;
	mode1->hsync_len = mode2->vl_hspw;
	}

	int exynos_mipi_dsi_set_display_mode(struct mipi_dsim_device *dsim,
	struct mipi_dsim_config *dsim_config)
	{
	struct exynos_platform_mipi_dsim *dsim_pd;
	struct fb_videomode lcd_video;
	struct vidinfo *vid;

	dsim_pd = (struct exynos_platform_mipi_dsim *)dsim->pd;
	vid = (struct vidinfo *)dsim_pd->lcd_panel_info;

	convert_to_fb_videomode(&lcd_video, vid);

	/* in case of VIDEO MODE (RGB INTERFACE), it sets polarities. */
	if (dsim->dsim_config->e_interface == (u32) DSIM_VIDEO) {
	if (dsim->dsim_config->auto_vertical_cnt == 0) {
	exynos_mipi_dsi_set_main_disp_vporch(dsim,
	vid->vl_cmd_allow_len,
	lcd_video.upper_margin,
	lcd_video.lower_margin);
	exynos_mipi_dsi_set_main_disp_hporch(dsim,
	lcd_video.left_margin,
	lcd_video.right_margin);
	exynos_mipi_dsi_set_main_disp_sync_area(dsim,
	lcd_video.vsync_len,
	lcd_video.hsync_len);
	}
	}

	exynos_mipi_dsi_set_main_disp_resol(dsim, lcd_video.xres,
	lcd_video.yres);

	exynos_mipi_dsi_display_config(dsim, dsim->dsim_config);

	debug("lcd panel ==> width = %d, height = %d\n",
	lcd_video.xres, lcd_video.yres);

	return 0;
	}

	int exynos_mipi_dsi_init_link(struct mipi_dsim_device *dsim)
	{
	unsigned int time_out = 100;

	switch (dsim->state) {
	case DSIM_STATE_INIT:
	exynos_mipi_dsi_init_fifo_pointer(dsim, 0x1f);

	/* dsi configuration */
	exynos_mipi_dsi_init_config(dsim);
	exynos_mipi_dsi_enable_lane(dsim, DSIM_LANE_CLOCK, 1);
	exynos_mipi_dsi_enable_lane(dsim, dsim->data_lane, 1);

	/* set clock configuration */
	exynos_mipi_dsi_set_clock(dsim,
	dsim->dsim_config->e_byte_clk, 1);

	/* check clock and data lane state are stop state */
	while (!(exynos_mipi_dsi_is_lane_state(dsim))) {
	time_out--;
	if (time_out == 0) {
	debug("DSI Master is not stop state.\n");
	debug("Check initialization process\n");

	return -EINVAL;
	}
	}

	dsim->state = DSIM_STATE_STOP;

	/* BTA sequence counters */
	exynos_mipi_dsi_set_stop_state_counter(dsim,
	dsim->dsim_config->stop_holding_cnt);
	exynos_mipi_dsi_set_bta_timeout(dsim,
	dsim->dsim_config->bta_timeout);
	exynos_mipi_dsi_set_lpdr_timeout(dsim,
	dsim->dsim_config->rx_timeout);

	return 0;
	default:
	debug("DSI Master is already init.\n");
	return 0;
	}

	return 0;
	}

	int exynos_mipi_dsi_set_hs_enable(struct mipi_dsim_device *dsim)
	{
	if (dsim->state == DSIM_STATE_STOP) {
	if (dsim->e_clk_src != DSIM_EXT_CLK_BYPASS) {
	dsim->state = DSIM_STATE_HSCLKEN;

	/* set LCDC and CPU transfer mode to HS. */
	exynos_mipi_dsi_set_lcdc_transfer_mode(dsim, 0);
	exynos_mipi_dsi_set_cpu_transfer_mode(dsim, 0);

	exynos_mipi_dsi_enable_hs_clock(dsim, 1);

	return 0;
	} else
	debug("clock source is external bypass.\n");
	} else
	debug("DSIM is not stop state.\n");

	return 0;
	}

	int exynos_mipi_dsi_set_data_transfer_mode(struct mipi_dsim_device *dsim,
	unsigned int mode)
	{
	if (mode) {
	if (dsim->state != DSIM_STATE_HSCLKEN) {
	debug("HS Clock lane is not enabled.\n");
	return -EINVAL;
	}

	exynos_mipi_dsi_set_lcdc_transfer_mode(dsim, 0);
	} else {
	if (dsim->state == DSIM_STATE_INIT \|\| dsim->state ==
	DSIM_STATE_ULPS) {
	debug("DSI Master is not STOP or HSDT state.\n");
	return -EINVAL;
	}

	exynos_mipi_dsi_set_cpu_transfer_mode(dsim, 0);
	}

	return 0;
	}

	int exynos_mipi_dsi_get_frame_done_status(struct mipi_dsim_device *dsim)
	{
	return _exynos_mipi_dsi_get_frame_done_status(dsim);
	}

	int exynos_mipi_dsi_clear_frame_done(struct mipi_dsim_device *dsim)
	{
	_exynos_mipi_dsi_clear_frame_done(dsim);

	return 0;
	}