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// SPDX-License-Identifier: GPL-2.0+
/*
* FB driver for the uPD161704 LCD Controller
*
* Copyright (C) 2014 Seong-Woo Kim
*
* Based on fb_ili9325.c by Noralf Tronnes
* Based on ili9325.c by Jeroen Domburg
* Init code from UTFT library by Henning Karlsen
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include "fbtft.h"
#define DRVNAME "fb_bd663474"
#define WIDTH 240
#define HEIGHT 320
#define BPP 16
static int init_display(struct fbtft_par *par)
{
if (!par->gpio.cs)
gpiod_set_value(par->gpio.cs, 0); /* Activate chip */
par->fbtftops.reset(par);
/* Initialization sequence from Lib_UTFT */
/* oscillator start */
write_reg(par, 0x000, 0x0001); /*oscillator 0: stop, 1: operation */
mdelay(10);
/* Power settings */
write_reg(par, 0x100, 0x0000); /* power supply setup */
write_reg(par, 0x101, 0x0000);
write_reg(par, 0x102, 0x3110);
write_reg(par, 0x103, 0xe200);
write_reg(par, 0x110, 0x009d);
write_reg(par, 0x111, 0x0022);
write_reg(par, 0x100, 0x0120);
mdelay(20);
write_reg(par, 0x100, 0x3120);
mdelay(80);
/* Display control */
write_reg(par, 0x001, 0x0100);
write_reg(par, 0x002, 0x0000);
write_reg(par, 0x003, 0x1230);
write_reg(par, 0x006, 0x0000);
write_reg(par, 0x007, 0x0101);
write_reg(par, 0x008, 0x0808);
write_reg(par, 0x009, 0x0000);
write_reg(par, 0x00b, 0x0000);
write_reg(par, 0x00c, 0x0000);
write_reg(par, 0x00d, 0x0018);
/* LTPS control settings */
write_reg(par, 0x012, 0x0000);
write_reg(par, 0x013, 0x0000);
write_reg(par, 0x018, 0x0000);
write_reg(par, 0x019, 0x0000);
write_reg(par, 0x203, 0x0000);
write_reg(par, 0x204, 0x0000);
write_reg(par, 0x210, 0x0000);
write_reg(par, 0x211, 0x00ef);
write_reg(par, 0x212, 0x0000);
write_reg(par, 0x213, 0x013f);
write_reg(par, 0x214, 0x0000);
write_reg(par, 0x215, 0x0000);
write_reg(par, 0x216, 0x0000);
write_reg(par, 0x217, 0x0000);
/* Gray scale settings */
write_reg(par, 0x300, 0x5343);
write_reg(par, 0x301, 0x1021);
write_reg(par, 0x302, 0x0003);
write_reg(par, 0x303, 0x0011);
write_reg(par, 0x304, 0x050a);
write_reg(par, 0x305, 0x4342);
write_reg(par, 0x306, 0x1100);
write_reg(par, 0x307, 0x0003);
write_reg(par, 0x308, 0x1201);
write_reg(par, 0x309, 0x050a);
/* RAM access settings */
write_reg(par, 0x400, 0x4027);
write_reg(par, 0x401, 0x0000);
write_reg(par, 0x402, 0x0000); /* First screen drive position (1) */
write_reg(par, 0x403, 0x013f); /* First screen drive position (2) */
write_reg(par, 0x404, 0x0000);
write_reg(par, 0x200, 0x0000);
write_reg(par, 0x201, 0x0000);
write_reg(par, 0x100, 0x7120);
write_reg(par, 0x007, 0x0103);
mdelay(10);
write_reg(par, 0x007, 0x0113);
return 0;
}
static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
switch (par->info->var.rotate) {
/* R200h = Horizontal GRAM Start Address */
/* R201h = Vertical GRAM Start Address */
case 0:
write_reg(par, 0x0200, xs);
write_reg(par, 0x0201, ys);
break;
case 180:
write_reg(par, 0x0200, WIDTH - 1 - xs);
write_reg(par, 0x0201, HEIGHT - 1 - ys);
break;
case 270:
write_reg(par, 0x0200, WIDTH - 1 - ys);
write_reg(par, 0x0201, xs);
break;
case 90:
write_reg(par, 0x0200, ys);
write_reg(par, 0x0201, HEIGHT - 1 - xs);
break;
}
write_reg(par, 0x202); /* Write Data to GRAM */
}
static int set_var(struct fbtft_par *par)
{
switch (par->info->var.rotate) {
/* AM: GRAM update direction */
case 0:
write_reg(par, 0x003, 0x1230);
break;
case 180:
write_reg(par, 0x003, 0x1200);
break;
case 270:
write_reg(par, 0x003, 0x1228);
break;
case 90:
write_reg(par, 0x003, 0x1218);
break;
}
return 0;
}
static struct fbtft_display display = {
.regwidth = 16,
.width = WIDTH,
.height = HEIGHT,
.bpp = BPP,
.fbtftops = {
.init_display = init_display,
.set_addr_win = set_addr_win,
.set_var = set_var,
},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "hitachi,bd663474", &display);
MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:bd663474");
MODULE_ALIAS("platform:bd663474");
MODULE_DESCRIPTION("FB driver for the uPD161704 LCD Controller");
MODULE_AUTHOR("Seong-Woo Kim");
MODULE_LICENSE("GPL");
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