sed156x.c

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/*
 * (C) Copyright 2003
 *
 * Pantelis Antoniou <[e-mail]>
 * Intracom S.A.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

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

#include <sed156x.h>

#ifdef CONFIG_SED156X

/* 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];