drivers/video/sed156x.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2003
  *
  * Pantelis Antoniou <panto@intracom.gr>
  * Intracom S.A.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <watchdog.h>

 #include <sed156x.h>

 /* configure according to the selected display */
 #if defined(CONFIG_SED156X_PG12864Q)
 #define LCD_WIDTH	128
 #define LCD_HEIGHT	64
 #define LCD_LINES	64
 #define LCD_PAGES	9
 #define LCD_COLUMNS	132
 #else
 #error Unsupported SED156x configuration
 #endif

 /* include the font data */
 #include <video_font.h>

 #if VIDEO_FONT_WIDTH != 8 || VIDEO_FONT_HEIGHT != 16
 #error Expecting VIDEO_FONT_WIDTH == 8 && VIDEO_FONT_HEIGHT == 16
 #endif

 #define LCD_BYTE_WIDTH		(LCD_WIDTH / 8)
 #define VIDEO_FONT_BYTE_WIDTH	(VIDEO_FONT_WIDTH / 8)

 #define LCD_TEXT_WIDTH	(LCD_WIDTH / VIDEO_FONT_WIDTH)
 #define LCD_TEXT_HEIGHT (LCD_HEIGHT / VIDEO_FONT_HEIGHT)

 #define LCD_BYTE_LINESZ		(LCD_BYTE_WIDTH * VIDEO_FONT_HEIGHT)

 const int sed156x_text_width = LCD_TEXT_WIDTH;
 const int sed156x_text_height = LCD_TEXT_HEIGHT;

 /**************************************************************************************/

 #define SED156X_SPI_RXD() (SED156X_SPI_RXD_PORT & SED156X_SPI_RXD_MASK)

 #define SED156X_SPI_TXD(x) \
 	do { \
 		if (x) \
 			SED156X_SPI_TXD_PORT |=	 SED156X_SPI_TXD_MASK; \
 		else \
 			SED156X_SPI_TXD_PORT &= ~SED156X_SPI_TXD_MASK; \
 	} while(0)

 #define SED156X_SPI_CLK(x) \
 	do { \
 		if (x) \
 			SED156X_SPI_CLK_PORT |=	 SED156X_SPI_CLK_MASK; \
 		else \
 			SED156X_SPI_CLK_PORT &= ~SED156X_SPI_CLK_MASK; \
 	} while(0)

 #define SED156X_SPI_CLK_TOGGLE() (SED156X_SPI_CLK_PORT ^= SED156X_SPI_CLK_MASK)

 #define SED156X_SPI_BIT_DELAY() /* no delay */

 #define SED156X_CS(x) \
 	do { \
 		if (x) \
 			SED156X_CS_PORT |=  SED156X_CS_MASK; \
 		else \
 			SED156X_CS_PORT &= ~SED156X_CS_MASK; \
 	} while(0)

 #define SED156X_A0(x) \
 	do { \
 		if (x) \
 			SED156X_A0_PORT |=  SED156X_A0_MASK; \
 		else \
 			SED156X_A0_PORT &= ~SED156X_A0_MASK; \
 	} while(0)

 /**************************************************************************************/

 /*** LCD Commands ***/

 #define LCD_ON		0xAF	/* Display ON					      */
 #define LCD_OFF		0xAE	/* Display OFF					      */
 #define LCD_LADDR	0x40	/* Display start line set + (6-bit) address	      */
 #define LCD_PADDR	0xB0	/* Page address set + (4-bit) page		      */
 #define LCD_CADRH	0x10	/* Column address set upper + (4-bit) column hi	      */
 #define LCD_CADRL	0x00	/* Column address set lower + (4-bit) column lo	      */
 #define LCD_ADC_NRM	0xA0	/* ADC select Normal				      */
 #define LCD_ADC_REV	0xA1	/* ADC select Reverse				      */
 #define LCD_DSP_NRM	0xA6	/* LCD display Normal				      */
 #define LCD_DSP_REV	0xA7	/* LCD display Reverse				      */
 #define LCD_DPT_NRM	0xA4	/* Display all points Normal			      */
 #define LCD_DPT_ALL	0xA5	/* Display all points ON			      */
 #define LCD_BIAS9	0xA2	/* LCD bias set 1/9				      */
 #define LCD_BIAS7	0xA3	/* LCD bias set 1/7				      */
 #define LCD_CAINC	0xE0	/* Read/modify/write				      */
 #define LCD_CAEND	0xEE	/* End						      */
 #define LCD_RESET	0xE2	/* Reset					      */
 #define LCD_C_NRM	0xC0	/* Common output mode select Normal direction	      */
 #define LCD_C_RVS	0xC8	/* Common output mode select Reverse direction	      */
 #define LCD_PWRMD	0x28	/* Power control set + (3-bit) mode		      */
 #define LCD_RESRT	0x20	/* V5 v. reg. int. resistor ratio set + (3-bit) ratio */
 #define LCD_EVSET	0x81	/* Electronic volume mode set + byte = (6-bit) volume */
 #define LCD_SIOFF	0xAC	/* Static indicator OFF				      */
 #define LCD_SION	0xAD	/* Static indicator ON + byte = (2-bit) mode	      */
 #define LCD_NOP		0xE3	/* NOP						      */
 #define LCD_TEST	0xF0	/* Test/Test mode reset (Note: *DO NOT USE*)	      */

 /*-------------------------------------------------------------------------------
   Compound commands
   -------------------------------------------------------------------------------
   Command	Description			Commands
   ----------	------------------------	-------------------------------------
   POWS_ON	POWER SAVER ON command		LCD_OFF, LCD_D_ALL
   POWS_OFF	POWER SAVER OFF command		LCD_D_NRM
   SLEEPON	SLEEP mode			LCD_SIOFF, POWS_ON
   SLEEPOFF	SLEEP mode cancel		LCD_D_NRM, LCD_SION, LCD_SIS_???
   STDBYON	STAND BY mode			LCD_SION, POWS_ON
   STDBYOFF	STAND BY mode cancel		LCD_D_NRM
   -------------------------------------------------------------------------------*/

 /*** LCD various parameters ***/
 #define LCD_PPB		8	/* Pixels per byte (display is B/W, 1 bit per pixel) */

 /*** LCD Status byte masks ***/
 #define LCD_S_BUSY	0x80	/* Status Read - BUSY mask   */
 #define LCD_S_ADC	0x40	/* Status Read - ADC mask    */
 #define LCD_S_ONOFF	0x20	/* Status Read - ON/OFF mask */
 #define LCD_S_RESET	0x10	/* Status Read - RESET mask  */

 /*** LCD commands parameter masks ***/
 #define LCD_M_LADDR	0x3F	/* Display start line (6-bit) address mask	     */
 #define LCD_M_PADDR	0x0F	/* Page address (4-bit) page mask		     */
 #define LCD_M_CADRH	0x0F	/* Column address upper (4-bit) column hi mask	     */
 #define LCD_M_CADRL	0x0F	/* Column address lower (4-bit) column lo mask	     */
 #define LCD_M_PWRMD	0x07	/* Power control (3-bit) mode mask		     */
 #define LCD_M_RESRT	0x07	/* V5 v. reg. int. resistor ratio (3-bit) ratio mask */
 #define LCD_M_EVSET	0x3F	/* Electronic volume mode byte (6-bit) volume mask   */
 #define LCD_M_SION	0x03	/* Static indicator ON (2-bit) mode mask	     */

 /*** LCD Power control cirquits control masks ***/
 #define LCD_PWRBSTR	0x04	/* Power control mode - Booster cirquit ON	     */
 #define LCD_PWRVREG	0x02	/* Power control mode - Voltage regulator cirquit ON */
 #define LCD_PWRVFOL	0x01	/* Power control mode - Voltage follower cirquit ON  */

 /*** LCD Static indicator states ***/
 #define LCD_SIS_OFF	0x00	/* Static indicator register set - OFF state		 */
 #define LCD_SIS_BL	0x01	/* Static indicator register set - 1s blink state	 */
 #define LCD_SIS_RBL	0x02	/* Static indicator register set - .5s rapid blink state */
 #define LCD_SIS_ON	0x03	/* Static indicator register set - constantly on state	 */

 /*** LCD functions special parameters (commands) ***/
 #define LCD_PREVP	0x80	/* Page number for moving to previous */
 #define LCD_NEXTP	0x81	/* or next page */
 #define LCD_ERR_P	0xFF	/* Error in page number */

 /*** LCD initialization settings ***/
 #define LCD_BIAS	LCD_BIAS9	/* Bias: 1/9		      */
 #define LCD_ADCMODE	LCD_ADC_NRM	/* ADC mode: normal	      */
 #define LCD_COMDIR	LCD_C_NRM	/* Common output mode: normal */
 #define LCD_RRATIO	0		/* Resistor ratio: 0	      */
 #define LCD_CNTRST	0x1C		/* electronic volume: 1Ch     */
 #define LCD_POWERM	(LCD_PWRBSTR | LCD_PWRVREG | LCD_PWRVFOL)	/* Power mode: All on */

 /**************************************************************************************/

 static inline unsigned int sed156x_transfer(unsigned int val)
 {
 	unsigned int rx;
 	int b;

 	rx = 0; b = 8;
 	while (--b >= 0) {
 		SED156X_SPI_TXD(val & 0x80);
 		val <<= 1;
 		SED156X_SPI_CLK_TOGGLE();
 		SED156X_SPI_BIT_DELAY();
 		rx <<= 1;
 		if (SED156X_SPI_RXD())
 			rx |= 1;
 		SED156X_SPI_CLK_TOGGLE();
 		SED156X_SPI_BIT_DELAY();
 	}

 	return rx;
 }

 unsigned int sed156x_data_transfer(unsigned int val)
 {
 	unsigned int rx;

 	SED156X_SPI_CLK(1);
 	SED156X_CS(0);
 	SED156X_A0(1);

 	rx = sed156x_transfer(val);

 	SED156X_CS(1);

 	return rx;
 }

 void sed156x_data_block_transfer(const u8 *p, int size)
 {
 	SED156X_SPI_CLK(1);
 	SED156X_CS(0);
 	SED156X_A0(1);

 	while (--size >= 0)
 		sed156x_transfer(*p++);

 	SED156X_CS(1);
 }

 unsigned int sed156x_cmd_transfer(unsigned int val)
 {
 	unsigned int rx;

 	SED156X_SPI_CLK(1);
 	SED156X_CS(0);
 	SED156X_A0(0);

 	rx = sed156x_transfer(val);

 	SED156X_CS(1);
 	SED156X_A0(1);

 	return rx;
 }

 /******************************************************************************/

 static u8 hw_screen[LCD_PAGES][LCD_COLUMNS];
 static u8 last_hw_screen[LCD_PAGES][LCD_COLUMNS];
 static u8 sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT];

 void sed156x_sync(void)
 {
 	int i, j, last_page;
 	u8 *d;
 	const u8 *s, *e, *b, *r;
 	u8 v0, v1, v2, v3, v4, v5, v6, v7;

 	/* copy and rotate sw_screen to hw_screen */
 	for (i = 0; i < LCD_HEIGHT / 8; i++) {

 		d = &hw_screen[i][0];
 		s = &sw_screen[LCD_BYTE_WIDTH * 8 * i + LCD_BYTE_WIDTH - 1];

 		for (j = 0; j < LCD_WIDTH / 8; j++) {

 			v0 = s[0 * LCD_BYTE_WIDTH];
 			v1 = s[1 * LCD_BYTE_WIDTH];
 			v2 = s[2 * LCD_BYTE_WIDTH];
 			v3 = s[3 * LCD_BYTE_WIDTH];
 			v4 = s[4 * LCD_BYTE_WIDTH];
 			v5 = s[5 * LCD_BYTE_WIDTH];
 			v6 = s[6 * LCD_BYTE_WIDTH];
 			v7 = s[7 * LCD_BYTE_WIDTH];

 			d[0] =	((v7 & 0x01) << 7) |
 				((v6 & 0x01) << 6) |
 				((v5 & 0x01) << 5) |
 				((v4 & 0x01) << 4) |
 				((v3 & 0x01) << 3) |
 				((v2 & 0x01) << 2) |
 				((v1 & 0x01) << 1) |
 				 (v0 & 0x01)	   ;

 			d[1] =	((v7 & 0x02) << 6) |
 				((v6 & 0x02) << 5) |
 				((v5 & 0x02) << 4) |
 				((v4 & 0x02) << 3) |
 				((v3 & 0x02) << 2) |
 				((v2 & 0x02) << 1) |
 				((v1 & 0x02) << 0) |
 				((v0 & 0x02) >> 1) ;

 			d[2] =	((v7 & 0x04) << 5) |
 				((v6 & 0x04) << 4) |
 				((v5 & 0x04) << 3) |
 				((v4 & 0x04) << 2) |
 				((v3 & 0x04) << 1) |
 				 (v2 & 0x04)	   |
 				((v1 & 0x04) >> 1) |
 				((v0 & 0x04) >> 2) ;

 			d[3] =	((v7 & 0x08) << 4) |
 				((v6 & 0x08) << 3) |
 				((v5 & 0x08) << 2) |
 				((v4 & 0x08) << 1) |
 				 (v3 & 0x08)	   |
 				((v2 & 0x08) >> 1) |
 				((v1 & 0x08) >> 2) |
 				((v0 & 0x08) >> 3) ;

 			d[4] =	((v7 & 0x10) << 3) |
 				((v6 & 0x10) << 2) |
 				((v5 & 0x10) << 1) |
 				 (v4 & 0x10)	   |
 				((v3 & 0x10) >> 1) |
 				((v2 & 0x10) >> 2) |
 				((v1 & 0x10) >> 3) |
 				((v0 & 0x10) >> 4) ;

 			d[5] =	((v7 & 0x20) << 2) |
 				((v6 & 0x20) << 1) |
 				 (v5 & 0x20)	   |
 				((v4 & 0x20) >> 1) |
 				((v3 & 0x20) >> 2) |
 				((v2 & 0x20) >> 3) |
 				((v1 & 0x20) >> 4) |
 				((v0 & 0x20) >> 5) ;

 			d[6] =	((v7 & 0x40) << 1) |
 				 (v6 & 0x40)	   |
 				((v5 & 0x40) >> 1) |
 				((v4 & 0x40) >> 2) |
 				((v3 & 0x40) >> 3) |
 				((v2 & 0x40) >> 4) |
 				((v1 & 0x40) >> 5) |
 				((v0 & 0x40) >> 6) ;

 			d[7] =	 (v7 & 0x80)	   |
 				((v6 & 0x80) >> 1) |
 				((v5 & 0x80) >> 2) |
 				((v4 & 0x80) >> 3) |
 				((v3 & 0x80) >> 4) |
 				((v2 & 0x80) >> 5) |
 				((v1 & 0x80) >> 6) |
 				((v0 & 0x80) >> 7) ;

 			d += 8;
 			s--;
 		}
 	}

 	/* and now output only the differences */
 	for (i = 0; i < LCD_PAGES; i++) {

 		b = &hw_screen[i][0];
 		e = &hw_screen[i][LCD_COLUMNS];

 		d = &last_hw_screen[i][0];
 		s = b;

 		last_page = -1;

 		/* update only the differences */
 		do {
 			while (s < e && *s == *d) {
 				s++;
 				d++;
 			}
 			if (s == e)
 				break;
 			r = s;
 			while (s < e && *s != *d)
 				*d++ = *s++;

 			j = r - b;

 			if (i != last_page) {
 				sed156x_cmd_transfer(LCD_PADDR | i);
 				last_page = i;
 			}

 			sed156x_cmd_transfer(LCD_CADRH | ((j >> 4) & 0x0F));
 			sed156x_cmd_transfer(LCD_CADRL | (j & 0x0F));
 			sed156x_data_block_transfer(r, s - r);

 		} while (s < e);
 	}

 /********
 	for (i = 0; i < LCD_PAGES; i++) {
 		sed156x_cmd_transfer(LCD_PADDR | i);
 		sed156x_cmd_transfer(LCD_CADRH | 0);
 		sed156x_cmd_transfer(LCD_CADRL | 0);
 		sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
 	}
 	memcpy(last_hw_screen, hw_screen, sizeof(last_hw_screen));
 ********/
 }

 void sed156x_clear(void)
 {
 	memset(sw_screen, 0, sizeof(sw_screen));
 }

 void sed156x_output_at(int x, int y, const char *str, int size)
 {
 	int i, j;
 	u8 *p;
 	const u8 *s;

 	if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH)
 		return;

 	p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];

 	while (--size >= 0) {

 		s = &video_fontdata[((int)*str++ & 0xff) * VIDEO_FONT_BYTE_WIDTH * VIDEO_FONT_HEIGHT];
 		for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
 			for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++)
 				*p++ = *s++;
 			p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
 		}
 		p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);

 		if (x >= LCD_TEXT_WIDTH)
 			break;
 		x++;
 	}
 }

 void sed156x_reverse_at(int x, int y, int size)
 {
 	int i, j;
 	u8 *p;

 	if ((unsigned int)y >= LCD_TEXT_HEIGHT || (unsigned int)x >= LCD_TEXT_WIDTH)
 		return;

 	p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];

 	while (--size >= 0) {

 		for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
 			for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++, p++)
 				*p = ~*p;
 			p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
 		}
 		p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);

 		if (x >= LCD_TEXT_WIDTH)
 			break;
 		x++;
 	}
 }

 void sed156x_scroll_line(void)
 {
 	memmove(&sw_screen[0],
 			&sw_screen[LCD_BYTE_LINESZ],
 			LCD_BYTE_WIDTH * (LCD_HEIGHT - VIDEO_FONT_HEIGHT));
 }

 void sed156x_scroll(int dx, int dy)
 {
 	u8 *p1 = NULL, *p2 = NULL, *p3 = NULL;	/* pacify gcc */
 	int adx, ady, i, sz;

 	adx = dx > 0 ? dx : -dx;
 	ady = dy > 0 ? dy : -dy;

 	/* overscroll? erase everything */
 	if (adx >= LCD_TEXT_WIDTH || ady >= LCD_TEXT_HEIGHT) {
 		memset(sw_screen, 0, sizeof(sw_screen));
 		return;
 	}

 	sz = LCD_BYTE_LINESZ * ady;
 	if (dy > 0) {
 		p1 = &sw_screen[0];
 		p2 = &sw_screen[sz];
 		p3 = &sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT - sz];
 	} else if (dy < 0) {
 		p1 = &sw_screen[sz];
 		p2 = &sw_screen[0];
 		p3 = &sw_screen[0];
 	}

 	if (ady > 0) {
 		memmove(p1, p2, LCD_BYTE_WIDTH * LCD_HEIGHT - sz);
 		memset(p3, 0, sz);
 	}

 	sz = VIDEO_FONT_BYTE_WIDTH * adx;
 	if (dx > 0) {
 		p1 = &sw_screen[0];
 		p2 = &sw_screen[0] + sz;
 		p3 = &sw_screen[0] + LCD_BYTE_WIDTH - sz;
 	} else if (dx < 0) {
 		p1 = &sw_screen[0] + sz;
 		p2 = &sw_screen[0];
 		p3 = &sw_screen[0];
 	}

 	/* xscroll */
 	if (adx > 0) {
 		for (i = 0; i < LCD_HEIGHT; i++) {
 			memmove(p1, p2, LCD_BYTE_WIDTH - sz);
 			memset(p3, 0, sz);
 			p1 += LCD_BYTE_WIDTH;
 			p2 += LCD_BYTE_WIDTH;
 			p3 += LCD_BYTE_WIDTH;
 		}
 	}
 }

 void sed156x_init(void)
 {
 	int i;

 	SED156X_CS(1);
 	SED156X_A0(1);

 	/* Send initialization commands to the LCD */
 	sed156x_cmd_transfer(LCD_OFF);			/* Turn display OFF	  */
 	sed156x_cmd_transfer(LCD_BIAS);			/* set the LCD Bias,	  */
 	sed156x_cmd_transfer(LCD_ADCMODE);		/* ADC mode,		  */
 	sed156x_cmd_transfer(LCD_COMDIR);		/* common output mode,	  */
 	sed156x_cmd_transfer(LCD_RESRT | LCD_RRATIO);	/* resistor ratio,	  */
 	sed156x_cmd_transfer(LCD_EVSET);		/* electronic volume,	  */
 	sed156x_cmd_transfer(LCD_CNTRST);
 	sed156x_cmd_transfer(LCD_PWRMD | LCD_POWERM);	/* and power mode	  */
 	sed156x_cmd_transfer(LCD_PADDR | 0);		/* cursor home		  */
 	sed156x_cmd_transfer(LCD_CADRH | 0);
 	sed156x_cmd_transfer(LCD_CADRL | 0);
 	sed156x_cmd_transfer(LCD_LADDR | 0);		/* and display start line */
 	sed156x_cmd_transfer(LCD_DSP_NRM);		/* LCD display Normal	  */

 	/* clear everything */
 	memset(sw_screen, 0, sizeof(sw_screen));
 	memset(hw_screen, 0, sizeof(hw_screen));
 	memset(last_hw_screen, 0, sizeof(last_hw_screen));

 	for (i = 0; i < LCD_PAGES; i++) {
 		sed156x_cmd_transfer(LCD_PADDR | i);
 		sed156x_cmd_transfer(LCD_CADRH | 0);
 		sed156x_cmd_transfer(LCD_CADRL | 0);
 		sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
 	}

 	sed156x_clear();
 	sed156x_sync();
 	sed156x_cmd_transfer(LCD_ON);			/* Turn display ON	  */
 }
	/*
	* (C) Copyright 2003
	*
	* Pantelis Antoniou <panto@intracom.gr>
	* Intracom S.A.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <watchdog.h>

	#include <sed156x.h>

	/* configure according to the selected display */
	#if defined(CONFIG_SED156X_PG12864Q)
	#define LCD_WIDTH 128
	#define LCD_HEIGHT 64
	#define LCD_LINES 64
	#define LCD_PAGES 9
	#define LCD_COLUMNS 132
	#else
	#error Unsupported SED156x configuration
	#endif

	/* include the font data */
	#include <video_font.h>

	#if VIDEO_FONT_WIDTH != 8 \|\| VIDEO_FONT_HEIGHT != 16
	#error Expecting VIDEO_FONT_WIDTH == 8 && VIDEO_FONT_HEIGHT == 16
	#endif

	#define LCD_BYTE_WIDTH (LCD_WIDTH / 8)
	#define VIDEO_FONT_BYTE_WIDTH (VIDEO_FONT_WIDTH / 8)

	#define LCD_TEXT_WIDTH (LCD_WIDTH / VIDEO_FONT_WIDTH)
	#define LCD_TEXT_HEIGHT (LCD_HEIGHT / VIDEO_FONT_HEIGHT)

	#define LCD_BYTE_LINESZ (LCD_BYTE_WIDTH * VIDEO_FONT_HEIGHT)

	const int sed156x_text_width = LCD_TEXT_WIDTH;
	const int sed156x_text_height = LCD_TEXT_HEIGHT;

	/**************************************************************************************/

	#define SED156X_SPI_RXD() (SED156X_SPI_RXD_PORT & SED156X_SPI_RXD_MASK)

	#define SED156X_SPI_TXD(x) \
	do { \
	if (x) \
	SED156X_SPI_TXD_PORT \|= SED156X_SPI_TXD_MASK; \
	else \
	SED156X_SPI_TXD_PORT &= ~SED156X_SPI_TXD_MASK; \
	} while(0)

	#define SED156X_SPI_CLK(x) \
	do { \
	if (x) \
	SED156X_SPI_CLK_PORT \|= SED156X_SPI_CLK_MASK; \
	else \
	SED156X_SPI_CLK_PORT &= ~SED156X_SPI_CLK_MASK; \
	} while(0)

	#define SED156X_SPI_CLK_TOGGLE() (SED156X_SPI_CLK_PORT ^= SED156X_SPI_CLK_MASK)

	#define SED156X_SPI_BIT_DELAY() /* no delay */

	#define SED156X_CS(x) \
	do { \
	if (x) \
	SED156X_CS_PORT \|= SED156X_CS_MASK; \
	else \
	SED156X_CS_PORT &= ~SED156X_CS_MASK; \
	} while(0)

	#define SED156X_A0(x) \
	do { \
	if (x) \
	SED156X_A0_PORT \|= SED156X_A0_MASK; \
	else \
	SED156X_A0_PORT &= ~SED156X_A0_MASK; \
	} while(0)

	/**************************************************************************************/

	/* LCD Commands */

	#define LCD_ON 0xAF /* Display ON */
	#define LCD_OFF 0xAE /* Display OFF */
	#define LCD_LADDR 0x40 /* Display start line set + (6-bit) address */
	#define LCD_PADDR 0xB0 /* Page address set + (4-bit) page */
	#define LCD_CADRH 0x10 /* Column address set upper + (4-bit) column hi */
	#define LCD_CADRL 0x00 /* Column address set lower + (4-bit) column lo */
	#define LCD_ADC_NRM 0xA0 /* ADC select Normal */
	#define LCD_ADC_REV 0xA1 /* ADC select Reverse */
	#define LCD_DSP_NRM 0xA6 /* LCD display Normal */
	#define LCD_DSP_REV 0xA7 /* LCD display Reverse */
	#define LCD_DPT_NRM 0xA4 /* Display all points Normal */
	#define LCD_DPT_ALL 0xA5 /* Display all points ON */
	#define LCD_BIAS9 0xA2 /* LCD bias set 1/9 */
	#define LCD_BIAS7 0xA3 /* LCD bias set 1/7 */
	#define LCD_CAINC 0xE0 /* Read/modify/write */
	#define LCD_CAEND 0xEE /* End */
	#define LCD_RESET 0xE2 /* Reset */
	#define LCD_C_NRM 0xC0 /* Common output mode select Normal direction */
	#define LCD_C_RVS 0xC8 /* Common output mode select Reverse direction */
	#define LCD_PWRMD 0x28 /* Power control set + (3-bit) mode */
	#define LCD_RESRT 0x20 /* V5 v. reg. int. resistor ratio set + (3-bit) ratio */
	#define LCD_EVSET 0x81 /* Electronic volume mode set + byte = (6-bit) volume */
	#define LCD_SIOFF 0xAC /* Static indicator OFF */
	#define LCD_SION 0xAD /* Static indicator ON + byte = (2-bit) mode */
	#define LCD_NOP 0xE3 /* NOP */
	#define LCD_TEST 0xF0 /* Test/Test mode reset (Note: DO NOT USE) */

	/*-------------------------------------------------------------------------------
	Compound commands
	-------------------------------------------------------------------------------
	Command Description Commands
	---------- ------------------------ -------------------------------------
	POWS_ON POWER SAVER ON command LCD_OFF, LCD_D_ALL
	POWS_OFF POWER SAVER OFF command LCD_D_NRM
	SLEEPON SLEEP mode LCD_SIOFF, POWS_ON
	SLEEPOFF SLEEP mode cancel LCD_D_NRM, LCD_SION, LCD_SIS_???
	STDBYON STAND BY mode LCD_SION, POWS_ON
	STDBYOFF STAND BY mode cancel LCD_D_NRM
	-------------------------------------------------------------------------------*/

	/* LCD various parameters */
	#define LCD_PPB 8 /* Pixels per byte (display is B/W, 1 bit per pixel) */

	/* LCD Status byte masks */
	#define LCD_S_BUSY 0x80 /* Status Read - BUSY mask */
	#define LCD_S_ADC 0x40 /* Status Read - ADC mask */
	#define LCD_S_ONOFF 0x20 /* Status Read - ON/OFF mask */
	#define LCD_S_RESET 0x10 /* Status Read - RESET mask */

	/* LCD commands parameter masks */
	#define LCD_M_LADDR 0x3F /* Display start line (6-bit) address mask */
	#define LCD_M_PADDR 0x0F /* Page address (4-bit) page mask */
	#define LCD_M_CADRH 0x0F /* Column address upper (4-bit) column hi mask */
	#define LCD_M_CADRL 0x0F /* Column address lower (4-bit) column lo mask */
	#define LCD_M_PWRMD 0x07 /* Power control (3-bit) mode mask */
	#define LCD_M_RESRT 0x07 /* V5 v. reg. int. resistor ratio (3-bit) ratio mask */
	#define LCD_M_EVSET 0x3F /* Electronic volume mode byte (6-bit) volume mask */
	#define LCD_M_SION 0x03 /* Static indicator ON (2-bit) mode mask */

	/* LCD Power control cirquits control masks */
	#define LCD_PWRBSTR 0x04 /* Power control mode - Booster cirquit ON */
	#define LCD_PWRVREG 0x02 /* Power control mode - Voltage regulator cirquit ON */
	#define LCD_PWRVFOL 0x01 /* Power control mode - Voltage follower cirquit ON */

	/* LCD Static indicator states */
	#define LCD_SIS_OFF 0x00 /* Static indicator register set - OFF state */
	#define LCD_SIS_BL 0x01 /* Static indicator register set - 1s blink state */
	#define LCD_SIS_RBL 0x02 /* Static indicator register set - .5s rapid blink state */
	#define LCD_SIS_ON 0x03 /* Static indicator register set - constantly on state */

	/* LCD functions special parameters (commands) */
	#define LCD_PREVP 0x80 /* Page number for moving to previous */
	#define LCD_NEXTP 0x81 /* or next page */
	#define LCD_ERR_P 0xFF /* Error in page number */

	/* LCD initialization settings */
	#define LCD_BIAS LCD_BIAS9 /* Bias: 1/9 */
	#define LCD_ADCMODE LCD_ADC_NRM /* ADC mode: normal */
	#define LCD_COMDIR LCD_C_NRM /* Common output mode: normal */
	#define LCD_RRATIO 0 /* Resistor ratio: 0 */
	#define LCD_CNTRST 0x1C /* electronic volume: 1Ch */
	#define LCD_POWERM (LCD_PWRBSTR \| LCD_PWRVREG \| LCD_PWRVFOL) /* Power mode: All on */

	/**************************************************************************************/

	static inline unsigned int sed156x_transfer(unsigned int val)
	{
	unsigned int rx;
	int b;

	rx = 0; b = 8;
	while (--b >= 0) {
	SED156X_SPI_TXD(val & 0x80);
	val <<= 1;
	SED156X_SPI_CLK_TOGGLE();
	SED156X_SPI_BIT_DELAY();
	rx <<= 1;
	if (SED156X_SPI_RXD())
	rx \|= 1;
	SED156X_SPI_CLK_TOGGLE();
	SED156X_SPI_BIT_DELAY();
	}

	return rx;
	}

	unsigned int sed156x_data_transfer(unsigned int val)
	{
	unsigned int rx;

	SED156X_SPI_CLK(1);
	SED156X_CS(0);
	SED156X_A0(1);

	rx = sed156x_transfer(val);

	SED156X_CS(1);

	return rx;
	}

	void sed156x_data_block_transfer(const u8 *p, int size)
	{
	SED156X_SPI_CLK(1);
	SED156X_CS(0);
	SED156X_A0(1);

	while (--size >= 0)
	sed156x_transfer(*p++);

	SED156X_CS(1);
	}

	unsigned int sed156x_cmd_transfer(unsigned int val)
	{
	unsigned int rx;

	SED156X_SPI_CLK(1);
	SED156X_CS(0);
	SED156X_A0(0);

	rx = sed156x_transfer(val);

	SED156X_CS(1);
	SED156X_A0(1);

	return rx;
	}

	/******************************************************************************/

	static u8 hw_screen[LCD_PAGES][LCD_COLUMNS];
	static u8 last_hw_screen[LCD_PAGES][LCD_COLUMNS];
	static u8 sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT];

	void sed156x_sync(void)
	{
	int i, j, last_page;
	u8 *d;
	const u8 s, e, b, r;
	u8 v0, v1, v2, v3, v4, v5, v6, v7;

	/* copy and rotate sw_screen to hw_screen */
	for (i = 0; i < LCD_HEIGHT / 8; i++) {

	d = &hw_screen[i][0];
	s = &sw_screen[LCD_BYTE_WIDTH * 8 * i + LCD_BYTE_WIDTH - 1];

	for (j = 0; j < LCD_WIDTH / 8; j++) {

	v0 = s[0 * LCD_BYTE_WIDTH];
	v1 = s[1 * LCD_BYTE_WIDTH];
	v2 = s[2 * LCD_BYTE_WIDTH];
	v3 = s[3 * LCD_BYTE_WIDTH];
	v4 = s[4 * LCD_BYTE_WIDTH];
	v5 = s[5 * LCD_BYTE_WIDTH];
	v6 = s[6 * LCD_BYTE_WIDTH];
	v7 = s[7 * LCD_BYTE_WIDTH];

	d[0] = ((v7 & 0x01) << 7) \|
	((v6 & 0x01) << 6) \|
	((v5 & 0x01) << 5) \|
	((v4 & 0x01) << 4) \|
	((v3 & 0x01) << 3) \|
	((v2 & 0x01) << 2) \|
	((v1 & 0x01) << 1) \|
	(v0 & 0x01) ;

	d[1] = ((v7 & 0x02) << 6) \|
	((v6 & 0x02) << 5) \|
	((v5 & 0x02) << 4) \|
	((v4 & 0x02) << 3) \|
	((v3 & 0x02) << 2) \|
	((v2 & 0x02) << 1) \|
	((v1 & 0x02) << 0) \|
	((v0 & 0x02) >> 1) ;

	d[2] = ((v7 & 0x04) << 5) \|
	((v6 & 0x04) << 4) \|
	((v5 & 0x04) << 3) \|
	((v4 & 0x04) << 2) \|
	((v3 & 0x04) << 1) \|
	(v2 & 0x04) \|
	((v1 & 0x04) >> 1) \|
	((v0 & 0x04) >> 2) ;

	d[3] = ((v7 & 0x08) << 4) \|
	((v6 & 0x08) << 3) \|
	((v5 & 0x08) << 2) \|
	((v4 & 0x08) << 1) \|
	(v3 & 0x08) \|
	((v2 & 0x08) >> 1) \|
	((v1 & 0x08) >> 2) \|
	((v0 & 0x08) >> 3) ;

	d[4] = ((v7 & 0x10) << 3) \|
	((v6 & 0x10) << 2) \|
	((v5 & 0x10) << 1) \|
	(v4 & 0x10) \|
	((v3 & 0x10) >> 1) \|
	((v2 & 0x10) >> 2) \|
	((v1 & 0x10) >> 3) \|
	((v0 & 0x10) >> 4) ;

	d[5] = ((v7 & 0x20) << 2) \|
	((v6 & 0x20) << 1) \|
	(v5 & 0x20) \|
	((v4 & 0x20) >> 1) \|
	((v3 & 0x20) >> 2) \|
	((v2 & 0x20) >> 3) \|
	((v1 & 0x20) >> 4) \|
	((v0 & 0x20) >> 5) ;

	d[6] = ((v7 & 0x40) << 1) \|
	(v6 & 0x40) \|
	((v5 & 0x40) >> 1) \|
	((v4 & 0x40) >> 2) \|
	((v3 & 0x40) >> 3) \|
	((v2 & 0x40) >> 4) \|
	((v1 & 0x40) >> 5) \|
	((v0 & 0x40) >> 6) ;

	d[7] = (v7 & 0x80) \|
	((v6 & 0x80) >> 1) \|
	((v5 & 0x80) >> 2) \|
	((v4 & 0x80) >> 3) \|
	((v3 & 0x80) >> 4) \|
	((v2 & 0x80) >> 5) \|
	((v1 & 0x80) >> 6) \|
	((v0 & 0x80) >> 7) ;

	d += 8;
	s--;
	}
	}

	/* and now output only the differences */
	for (i = 0; i < LCD_PAGES; i++) {

	b = &hw_screen[i][0];
	e = &hw_screen[i][LCD_COLUMNS];

	d = &last_hw_screen[i][0];
	s = b;

	last_page = -1;

	/* update only the differences */
	do {
	while (s < e && s == d) {
	s++;
	d++;
	}
	if (s == e)
	break;
	r = s;
	while (s < e && s != d)
	d++ = s++;

	j = r - b;

	if (i != last_page) {
	sed156x_cmd_transfer(LCD_PADDR \| i);
	last_page = i;
	}

	sed156x_cmd_transfer(LCD_CADRH \| ((j >> 4) & 0x0F));
	sed156x_cmd_transfer(LCD_CADRL \| (j & 0x0F));
	sed156x_data_block_transfer(r, s - r);

	} while (s < e);
	}

	/********
	for (i = 0; i < LCD_PAGES; i++) {
	sed156x_cmd_transfer(LCD_PADDR \| i);
	sed156x_cmd_transfer(LCD_CADRH \| 0);
	sed156x_cmd_transfer(LCD_CADRL \| 0);
	sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
	}
	memcpy(last_hw_screen, hw_screen, sizeof(last_hw_screen));
	********/
	}

	void sed156x_clear(void)
	{
	memset(sw_screen, 0, sizeof(sw_screen));
	}

	void sed156x_output_at(int x, int y, const char *str, int size)
	{
	int i, j;
	u8 *p;
	const u8 *s;

	if ((unsigned int)y >= LCD_TEXT_HEIGHT \|\| (unsigned int)x >= LCD_TEXT_WIDTH)
	return;

	p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];

	while (--size >= 0) {

	s = &video_fontdata[((int)str++ & 0xff) VIDEO_FONT_BYTE_WIDTH * VIDEO_FONT_HEIGHT];
	for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
	for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++)
	p++ = s++;
	p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
	}
	p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);

	if (x >= LCD_TEXT_WIDTH)
	break;
	x++;
	}
	}

	void sed156x_reverse_at(int x, int y, int size)
	{
	int i, j;
	u8 *p;

	if ((unsigned int)y >= LCD_TEXT_HEIGHT \|\| (unsigned int)x >= LCD_TEXT_WIDTH)
	return;

	p = &sw_screen[y * VIDEO_FONT_HEIGHT * LCD_BYTE_WIDTH + x * VIDEO_FONT_BYTE_WIDTH];

	while (--size >= 0) {

	for (i = 0; i < VIDEO_FONT_HEIGHT; i++) {
	for (j = 0; j < VIDEO_FONT_BYTE_WIDTH; j++, p++)
	p = ~p;
	p += LCD_BYTE_WIDTH - VIDEO_FONT_BYTE_WIDTH;
	}
	p -= (LCD_BYTE_LINESZ - VIDEO_FONT_BYTE_WIDTH);

	if (x >= LCD_TEXT_WIDTH)
	break;
	x++;
	}
	}

	void sed156x_scroll_line(void)
	{
	memmove(&sw_screen[0],
	&sw_screen[LCD_BYTE_LINESZ],
	LCD_BYTE_WIDTH * (LCD_HEIGHT - VIDEO_FONT_HEIGHT));
	}

	void sed156x_scroll(int dx, int dy)
	{
	u8 p1 = NULL, p2 = NULL, p3 = NULL; / pacify gcc */
	int adx, ady, i, sz;

	adx = dx > 0 ? dx : -dx;
	ady = dy > 0 ? dy : -dy;

	/* overscroll? erase everything */
	if (adx >= LCD_TEXT_WIDTH \|\| ady >= LCD_TEXT_HEIGHT) {
	memset(sw_screen, 0, sizeof(sw_screen));
	return;
	}

	sz = LCD_BYTE_LINESZ * ady;
	if (dy > 0) {
	p1 = &sw_screen[0];
	p2 = &sw_screen[sz];
	p3 = &sw_screen[LCD_BYTE_WIDTH * LCD_HEIGHT - sz];
	} else if (dy < 0) {
	p1 = &sw_screen[sz];
	p2 = &sw_screen[0];
	p3 = &sw_screen[0];
	}

	if (ady > 0) {
	memmove(p1, p2, LCD_BYTE_WIDTH * LCD_HEIGHT - sz);
	memset(p3, 0, sz);
	}

	sz = VIDEO_FONT_BYTE_WIDTH * adx;
	if (dx > 0) {
	p1 = &sw_screen[0];
	p2 = &sw_screen[0] + sz;
	p3 = &sw_screen[0] + LCD_BYTE_WIDTH - sz;
	} else if (dx < 0) {
	p1 = &sw_screen[0] + sz;
	p2 = &sw_screen[0];
	p3 = &sw_screen[0];
	}

	/* xscroll */
	if (adx > 0) {
	for (i = 0; i < LCD_HEIGHT; i++) {
	memmove(p1, p2, LCD_BYTE_WIDTH - sz);
	memset(p3, 0, sz);
	p1 += LCD_BYTE_WIDTH;
	p2 += LCD_BYTE_WIDTH;
	p3 += LCD_BYTE_WIDTH;
	}
	}
	}

	void sed156x_init(void)
	{
	int i;

	SED156X_CS(1);
	SED156X_A0(1);

	/* Send initialization commands to the LCD */
	sed156x_cmd_transfer(LCD_OFF); /* Turn display OFF */
	sed156x_cmd_transfer(LCD_BIAS); /* set the LCD Bias, */
	sed156x_cmd_transfer(LCD_ADCMODE); /* ADC mode, */
	sed156x_cmd_transfer(LCD_COMDIR); /* common output mode, */
	sed156x_cmd_transfer(LCD_RESRT \| LCD_RRATIO); /* resistor ratio, */
	sed156x_cmd_transfer(LCD_EVSET); /* electronic volume, */
	sed156x_cmd_transfer(LCD_CNTRST);
	sed156x_cmd_transfer(LCD_PWRMD \| LCD_POWERM); /* and power mode */
	sed156x_cmd_transfer(LCD_PADDR \| 0); /* cursor home */
	sed156x_cmd_transfer(LCD_CADRH \| 0);
	sed156x_cmd_transfer(LCD_CADRL \| 0);
	sed156x_cmd_transfer(LCD_LADDR \| 0); /* and display start line */
	sed156x_cmd_transfer(LCD_DSP_NRM); /* LCD display Normal */

	/* clear everything */
	memset(sw_screen, 0, sizeof(sw_screen));
	memset(hw_screen, 0, sizeof(hw_screen));
	memset(last_hw_screen, 0, sizeof(last_hw_screen));

	for (i = 0; i < LCD_PAGES; i++) {
	sed156x_cmd_transfer(LCD_PADDR \| i);
	sed156x_cmd_transfer(LCD_CADRH \| 0);
	sed156x_cmd_transfer(LCD_CADRL \| 0);
	sed156x_data_block_transfer(&hw_screen[i][0], LCD_COLUMNS);
	}

	sed156x_clear();
	sed156x_sync();
	sed156x_cmd_transfer(LCD_ON); /* Turn display ON */
	}