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      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * ld9040 AMOLED LCD panel driver.
      4  *
      5  * Copyright (C) 2012 Samsung Electronics
      6  * Donghwa Lee <dh09.lee (at) samsung.com>
      7  */
      8 
      9 #include <common.h>
     10 #include <spi.h>
     11 
     12 static const unsigned char SEQ_USER_SETTING[] = {
     13 	0xF0, 0x5A, 0x5A
     14 };
     15 
     16 static const unsigned char SEQ_ELVSS_ON[] = {
     17 	0xB1, 0x0D, 0x00, 0x16,
     18 };
     19 
     20 static const unsigned char SEQ_GTCON[] = {
     21 	0xF7, 0x09, 0x00, 0x00,
     22 };
     23 
     24 static const unsigned char SEQ_PANEL_CONDITION[] = {
     25 	0xF8, 0x05, 0x65, 0x96, 0x71, 0x7D, 0x19, 0x3B,
     26 	0x0D, 0x19, 0x7E, 0x0D, 0xE2, 0x00, 0x00, 0x7E,
     27 	0x7D, 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02,
     28 };
     29 
     30 static const unsigned char SEQ_GAMMA_SET1[] = {
     31 	0xF9, 0x00, 0xA7, 0xB4, 0xAE, 0xBF, 0x00, 0x91,
     32 	0x00, 0xB2, 0xB4, 0xAA, 0xBB, 0x00, 0xAC, 0x00,
     33 	0xB3, 0xB1, 0xAA, 0xBC, 0x00, 0xB3,
     34 };
     35 
     36 static const unsigned char SEQ_GAMMA_CTRL[] = {
     37 	0xFB, 0x02, 0x5A,
     38 };
     39 
     40 static const unsigned char SEQ_DISPCTL[] = {
     41 	0xF2, 0x02, 0x08, 0x08, 0x10, 0x10,
     42 };
     43 
     44 static const unsigned char SEQ_MANPWR[] = {
     45 	0xB0, 0x04,
     46 };
     47 
     48 static const unsigned char SEQ_PWR_CTRL[] = {
     49 	0xF4, 0x0A, 0x87, 0x25, 0x6A, 0x44, 0x02, 0x88,
     50 };
     51 
     52 static const unsigned char SEQ_SLPOUT[] = {
     53 	0x11,
     54 };
     55 
     56 static const unsigned char SEQ_DISPON[] = {
     57 	0x29,
     58 };
     59 
     60 static const unsigned char SEQ_DISPOFF[] = {
     61 	0x28,
     62 };
     63 
     64 static void ld9040_spi_write(const unsigned char *wbuf, unsigned int size_cmd)
     65 {
     66 	int i = 0;
     67 
     68 	/*
     69 	 * Data are transmitted in 9-bit words:
     70 	 * the first bit is command/parameter, the other are the value.
     71 	 * The value's LSB is shifted to MSB position, to be sent as 9th bit
     72 	 */
     73 
     74 	unsigned int data_out = 0, data_in = 0;
     75 	for (i = 0; i < size_cmd; i++) {
     76 		data_out = wbuf[i] >> 1;
     77 		if (i != 0)
     78 			data_out += 0x0080;
     79 		if (wbuf[i] & 0x01)
     80 			data_out += 0x8000;
     81 		spi_xfer(NULL, 9, &data_out, &data_in, SPI_XFER_BEGIN);
     82 	}
     83 }
     84 
     85 void ld9040_cfg_ldo(void)
     86 {
     87 	udelay(10);
     88 
     89 	ld9040_spi_write(SEQ_USER_SETTING,
     90 					ARRAY_SIZE(SEQ_USER_SETTING));
     91 	ld9040_spi_write(SEQ_PANEL_CONDITION,
     92 					ARRAY_SIZE(SEQ_PANEL_CONDITION));
     93 	ld9040_spi_write(SEQ_DISPCTL, ARRAY_SIZE(SEQ_DISPCTL));
     94 	ld9040_spi_write(SEQ_MANPWR, ARRAY_SIZE(SEQ_MANPWR));
     95 	ld9040_spi_write(SEQ_PWR_CTRL, ARRAY_SIZE(SEQ_PWR_CTRL));
     96 	ld9040_spi_write(SEQ_ELVSS_ON, ARRAY_SIZE(SEQ_ELVSS_ON));
     97 	ld9040_spi_write(SEQ_GTCON, ARRAY_SIZE(SEQ_GTCON));
     98 	ld9040_spi_write(SEQ_GAMMA_SET1, ARRAY_SIZE(SEQ_GAMMA_SET1));
     99 	ld9040_spi_write(SEQ_GAMMA_CTRL, ARRAY_SIZE(SEQ_GAMMA_CTRL));
    100 	ld9040_spi_write(SEQ_SLPOUT, ARRAY_SIZE(SEQ_SLPOUT));
    101 
    102 	udelay(120);
    103 }
    104 
    105 void ld9040_enable_ldo(unsigned int onoff)
    106 {
    107 	if (onoff)
    108 		ld9040_spi_write(SEQ_DISPON, ARRAY_SIZE(SEQ_DISPON));
    109 	else
    110 		ld9040_spi_write(SEQ_DISPOFF, ARRAY_SIZE(SEQ_DISPOFF));
    111 }
    112