lcdif-rk27xx.c
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 Marcin Bukat
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/

#include "config.h"
#include "kernel.h"
#include "lcd.h"
#include "system.h"
#include "cpu.h"
#include "lcdif-rk27xx.h"

/* dwdma linked list struct */
struct llp_t {
uint32_t sar;
uint32_t dar;
struct llp_t *llp;
uint32_t ctl_l;
uint32_t ctl_h;
uint32_t dstat;
};

/* structs which describe full screen update */
struct llp_t scr_llp[LCD_HEIGHT];

static void llp_setup(void *src, void *dst, struct llp_t *llp, uint32_t size)
{
llp->sar = (uint32_t)src;
llp->dar = (uint32_t)dst;
llp->llp = llp + 1;
llp->ctl_h = size;
llp->ctl_l = (1<<20) |
(1<<23) |
(1<<17) |
(2<<1) |
(2<<4) |
(3<<11) |
(3<<14) |
(1<<27) |
(1<<28);
}

static void llp_end(struct llp_t *llp)
{
llp->ctl_l &= ~((1<<27)|(1<<28));
}

static void create_llp(void)
{
int i = 0;

/* build LLPs */
for (i=0; i<LCD_HEIGHT; i++)
llp_setup(FBADDR(0,i), (void *)&LCD_BUFF+(i%4)*LCD_WIDTH/2, &scr_llp[i], LCD_WIDTH/2);
llp_end(&scr_llp[LCD_HEIGHT-1]);
}

static void dwdma_init(void)
{
DWDMA_DMA_CHEN = 0xf00;
DWDMA_CLEAR_BLOCK = 0x0f;
DWDMA_DMA_CFG = 1; /* global enable */
}

static void dwdma_start(uint8_t ch, struct llp_t *llp, uint8_t handshake)
{
DWDMA_SAR(ch) = 0;
DWDMA_DAR(ch) = 0;
DWDMA_LLP(ch) = (uint32_t)llp;
DWDMA_CTL_L(ch) = (1<<20) |
(1<<23) |
(1<<17) |
(2<<1) |
(2<<4) |
(3<<11) |
(3<<14) |
(1<<27) |
(1<<28);

DWDMA_CTL_H(ch) = 1;
DWDMA_CFG_L(ch) = (7<<5);
DWDMA_CFG_H(ch) = (handshake<<11)|(1<<2);
DWDMA_SGR(ch) = (13<<20);
DWDMA_DMA_CHEN = (0x101<<ch);

}

unsigned int lcd_data_transform(unsigned int data)
{
unsigned int r, g, b;

#if defined(RK27_GENERIC)
/* 18 bit interface */
r = (data & 0x0000fc00)<<8;
/* g = ((data & 0x00000300) >> 2) | ((data & 0x000000e0) >> 3); */
g = ((data & 0x00000300) << 6) | ((data & 0x000000e0) << 5);
b = (data & 0x00000001f) << 3;
#elif defined(HM60X) || defined(HM801)
/* 16 bit interface */
r = (data & 0x0000f800) << 8;
g = (data & 0x000007e0) << 5;
b = (data & 0x0000001f) << 3;
#else
#error "Unknown target"
#endif

return (r | g | b);
}

void lcd_cmd(unsigned int cmd)
{
LCD_COMMAND = lcd_data_transform(cmd);
}

void lcd_data(unsigned int data)
{
LCD_DATA = lcd_data_transform(data);
}

void lcd_write_reg(unsigned int reg, unsigned int val)
{
lcd_cmd(reg);
lcd_data(val);
}

void lcdctrl_bypass(unsigned int on_off)
{
while (!(LCDC_STA & LCDC_MCU_IDLE));

if (on_off)
MCU_CTRL |= MCU_CTRL_BYPASS;
else
MCU_CTRL &= ~MCU_CTRL_BYPASS;
}

/* This part is unclear. I am unable to use buffered/FIFO based writes
* to lcd. Depending on settings of IF I get various patterns on display
* but not what I want to display apparently.
*/
static void lcdctrl_init(void)
{
/* alpha b111
* stop at current frame complete
* MCU mode
* 24b RGB
*/
LCDC_CTRL = ALPHA(7) | LCDC_STOP | LCDC_MCU;
MCU_CTRL = ALPHA_BASE(0x3f) | MCU_CTRL_BYPASS;

HOR_BP = LCD_WIDTH + 3; /* define horizonatal active region */
VERT_BP = LCD_HEIGHT; /* define vertical active region */
// VERT_PERIOD = 0xfff; /* CSn/WEn/RDn signal timings */

LINE0_YADDR = 0;
LINE1_YADDR = 1 * LCD_WIDTH/2;
LINE2_YADDR = 2 * LCD_WIDTH/2;
LINE3_YADDR = 3 * LCD_WIDTH/2;

LINE0_UVADDR = 1;
LINE1_UVADDR = (1 * LCD_WIDTH/2) + 1;
LINE2_UVADDR = (2 * LCD_WIDTH/2) + 1;
LINE3_UVADDR = (3 * LCD_WIDTH/2) + 1;

LCDC_INTR_MASK = 0; /* INTR_MASK_EVENLINE; */
}

/* configure pins to drive lcd in 18bit mode (16bit mode for HiFiMAN's) */
static void iomux_lcd(enum lcdif_mode_t mode)
{
unsigned long muxa;

muxa = SCU_IOMUXA_CON & ~(IOMUX_LCD_VSYNC|IOMUX_LCD_DEN|0xff);

if (mode == LCDIF_18BIT)
{
muxa |= IOMUX_LCD_D18|IOMUX_LCD_D20|IOMUX_LCD_D22|IOMUX_LCD_D17|IOMUX_LCD_D16;
}

SCU_IOMUXA_CON = muxa;
SCU_IOMUXB_CON |= IOMUX_LCD_D815;
}

void lcdif_init(enum lcdif_mode_t mode)
{
iomux_lcd(mode); /* setup pins for lcd interface */
dwdma_init();
lcdctrl_init(); /* basic lcdc module configuration */
create_llp();
lcdctrl_bypass(1); /* run in bypass mode - all writes goes directly to lcd controller */
}

/* This is ugly hack. We drive lcd in bypass mode
* where all writes goes directly to lcd controller.
* This is suboptimal at best. IF module povides
* FIFO, internal sram buffer, hardware scaller,
* DMA signals, hardware alpha blending and more.
* BUT the fact is that I have no idea how to use
* this modes. Datasheet floating around is very
* unclean in this regard and OF uses ackward
* lcd update routines which are hard to understand.
* Moreover OF sets some bits in IF module registers
* which are referred as reseved in datasheet.
*/
void lcd_update()
{
lcdctrl_bypass(0);
while (!(LCDC_STA & LCDC_MCU_IDLE));
commit_discard_dcache_range(FBADDR(0,0), 2*LCD_WIDTH*LCD_HEIGHT);
dwdma_start(0, scr_llp, 6);
udelay(100);

MCU_CTRL=(1<<1)|(1<<2)|(1<<5);
//lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}


lcd-rk27generic.c
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2011 Marcin Bukat
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/

#include "config.h"
#include "kernel.h"
#include "lcd.h"
#include "system.h"
#include "cpu.h"
#include "spfd5420a.h"
#include "lcdif-rk27xx.h"

/* TODO: convert to udelay() */
static inline void delay_nop(int cycles)
{
asm volatile ("1: subs %[n], %[n], #1 \n\t"
" bne 1b"
:
: [n] "r" (cycles));
}


/* converts RGB565 pixel into internal lcd bus format */
static unsigned int lcd_pixel_transform(unsigned short rgb565)
{
unsigned int r, g, b;
b = rgb565 & 0x1f;
g = (rgb565 >> 5) & 0x3f;
r = (rgb565 >> 11) & 0x1f;

return r<<19 | g<<10 | b<<3;
}

/* not tested */
static void lcd_sleep(bool sleep)
{
if (sleep)
{
/* enter sleep mode */
lcd_write_reg(DISPLAY_CTRL1, 0x0170);
delay_nop(50);
lcd_write_reg(DISPLAY_CTRL1, 0x0000);
delay_nop(50);
lcd_write_reg(PWR_CTRL1, 0x14B4);
}
else
{
/* return to normal operation */
lcd_write_reg(PWR_CTRL1, 0x14B0);
delay_nop(50);
lcd_write_reg(DISPLAY_CTRL1, 0x0173);
}

lcd_cmd(GRAM_WRITE);
}

static void lcd_display_init(void)
{
unsigned int x, y;

lcd_write_reg(RESET, 0x0001);
delay_nop(10000);
lcd_write_reg(RESET, 0x0000);
delay_nop(10000);
lcd_write_reg(IF_ENDIAN, 0x0000); /* order of receiving data */
lcd_write_reg(DRIVER_OUT_CTRL, 0x0000);
lcd_write_reg(ENTRY_MODE, 0x1038);
lcd_write_reg(WAVEFORM_CTRL, 0x0100);
lcd_write_reg(SHAPENING_CTRL, 0x0000);
lcd_write_reg(DISPLAY_CTRL2, 0x0808);
lcd_write_reg(LOW_PWR_CTRL1, 0x0001);
lcd_write_reg(LOW_PWR_CTRL2, 0x0010);
lcd_write_reg(EXT_DISP_CTRL1, 0x0000);
lcd_write_reg(EXT_DISP_CTRL2, 0x0000);
lcd_write_reg(BASE_IMG_SIZE, 0x3100);
lcd_write_reg(BASE_IMG_CTRL, 0x0001);
lcd_write_reg(VSCROLL_CTRL, 0x0000);
lcd_write_reg(PART1_POS, 0x0000);
lcd_write_reg(PART1_START, 0x0000);
lcd_write_reg(PART1_END, 0x018F);
lcd_write_reg(PART2_POS, 0x0000);
lcd_write_reg(PART2_START, 0x0000);
lcd_write_reg(PART2_END, 0x0000);

lcd_write_reg(PANEL_IF_CTRL1, 0x0011);
delay_nop(10000);
lcd_write_reg(PANEL_IF_CTRL2, 0x0202);
lcd_write_reg(PANEL_IF_CTRL3, 0x0300);
delay_nop(10000);
lcd_write_reg(PANEL_IF_CTRL4, 0x021E);
lcd_write_reg(PANEL_IF_CTRL5, 0x0202);
lcd_write_reg(PANEL_IF_CTRL6, 0x0100);
lcd_write_reg(FRAME_MKR_CTRL, 0x0000);
lcd_write_reg(MDDI_CTRL, 0x0000);

lcd_write_reg(GAMMA_CTRL1, 0x0101);
lcd_write_reg(GAMMA_CTRL2, 0x0000);
lcd_write_reg(GAMMA_CTRL3, 0x0016);
lcd_write_reg(GAMMA_CTRL4, 0x2913);
lcd_write_reg(GAMMA_CTRL5, 0x260B);
lcd_write_reg(GAMMA_CTRL6, 0x0101);
lcd_write_reg(GAMMA_CTRL7, 0x1204);
lcd_write_reg(GAMMA_CTRL8, 0x0415);
lcd_write_reg(GAMMA_CTRL9, 0x0205);
lcd_write_reg(GAMMA_CTRL10, 0x0303);
lcd_write_reg(GAMMA_CTRL11, 0x0E05);
lcd_write_reg(GAMMA_CTRL12, 0x0D01);
lcd_write_reg(GAMMA_CTRL13, 0x010D);
lcd_write_reg(GAMMA_CTRL14, 0x050E);
lcd_write_reg(GAMMA_CTRL15, 0x0303);
lcd_write_reg(GAMMA_CTRL16, 0x0502);

/* power on */
lcd_write_reg(DISPLAY_CTRL1, 0x0001);
lcd_write_reg(PWR_CTRL6, 0x0001);
lcd_write_reg(PWR_CTRL7, 0x0060);
delay_nop(50000);
lcd_write_reg(PWR_CTRL1, 0x16B0);
delay_nop(10000);
lcd_write_reg(PWR_CTRL2, 0x0147);
delay_nop(10000);
lcd_write_reg(PWR_CTRL3, 0x0117);
delay_nop(10000);
lcd_write_reg(PWR_CTRL4, 0x2F00);
delay_nop(50000);
lcd_write_reg(VCOM_HV2, 0x0000); /* src 0x0090 */
delay_nop(10000);
lcd_write_reg(VCOM_HV1, 0x0008); /* src 0x000A */
lcd_write_reg(PWR_CTRL3, 0x01BE);
delay_nop(10000);

/* addresses setup */
lcd_write_reg(WINDOW_H_START, 0x0000);
lcd_write_reg(WINDOW_H_END, 0x00EF); /* 239 */
lcd_write_reg(WINDOW_V_START, 0x0000);
lcd_write_reg(WINDOW_V_END, 0x018F); /* 399 */
lcd_write_reg(GRAM_H_ADDR, 0x0000);
lcd_write_reg(GRAM_V_ADDR, 0x0000);

/* display on */
lcd_write_reg(DISPLAY_CTRL1, 0x0021);
delay_nop(40000);
lcd_write_reg(DISPLAY_CTRL1, 0x0061);
delay_nop(100000);
lcd_write_reg(DISPLAY_CTRL1, 0x0173);
delay_nop(300000);


/* clear screen */
lcd_cmd(GRAM_WRITE);

for (x=0; x<LCD_WIDTH; x++)
for(y=0; y<LCD_HEIGHT; y++)
lcd_data(0x000000);

lcd_sleep(false);
}

void lcd_init_device(void)
{
lcdif_init(LCDIF_18BIT);
lcd_display_init();
}

void lcd_update_rect(int x, int y, int width, int height)
{
(void)x;
(void)y;
(void)width;
(void)height;

lcd_update();
#if 0
int px = x, py = y;
int pxmax = x + width, pymax = y + height;

/* addresses setup */
lcd_write_reg(WINDOW_H_START, y);
lcd_write_reg(WINDOW_H_END, pymax-1);
lcd_write_reg(WINDOW_V_START, x);
lcd_write_reg(WINDOW_V_END, pxmax-1);
lcd_write_reg(GRAM_H_ADDR, y);
lcd_write_reg(GRAM_V_ADDR, x);

lcd_cmd(GRAM_WRITE);

for (py=y; py<pymax; py++)
{
for (px=x; px<pxmax; px++)
LCD_DATA = lcd_pixel_transform(*FBADDR(px,py));
}
#endif
}

/* Blit a YUV bitmap directly to the LCD */
void lcd_blit_yuv(unsigned char * const src[3],
int src_x, int src_y, int stride,
int x, int y, int width, int height)
{
(void)src;
(void)src_x;
(void)src_y;
(void)stride;
(void)x;
(void)y;
(void)width;
(void)height;
}