drivers/staging/fbtft/fb_seps525.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * FB driver for the NHD-1.69-160128UGC3 (Newhaven Display International, Inc.)
   4  * using the SEPS525 (Syncoam) LCD Controller
   5  *
   6  * Copyright (C) 2016 Analog Devices Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/bits.h>
  20 #include <linux/delay.h>
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23
  24 #include "fbtft.h"
  25
  26 #define DRVNAME         "fb_seps525"
  27 #define WIDTH           160
  28 #define HEIGHT          128
  29
  30 #define SEPS525_INDEX 0x00
  31 #define SEPS525_STATUS_RD 0x01
  32 #define SEPS525_OSC_CTL 0x02
  33 #define SEPS525_IREF 0x80
  34 #define SEPS525_CLOCK_DIV 0x03
  35 #define SEPS525_REDUCE_CURRENT 0x04
  36 #define SEPS525_SOFT_RST 0x05
  37 #define SEPS525_DISP_ONOFF 0x06
  38 #define SEPS525_PRECHARGE_TIME_R 0x08
  39 #define SEPS525_PRECHARGE_TIME_G 0x09
  40 #define SEPS525_PRECHARGE_TIME_B 0x0A
  41 #define SEPS525_PRECHARGE_CURRENT_R 0x0B
  42 #define SEPS525_PRECHARGE_CURRENT_G 0x0C
  43 #define SEPS525_PRECHARGE_CURRENT_B 0x0D
  44 #define SEPS525_DRIVING_CURRENT_R 0x10
  45 #define SEPS525_DRIVING_CURRENT_G 0x11
  46 #define SEPS525_DRIVING_CURRENT_B 0x12
  47 #define SEPS525_DISPLAYMODE_SET 0x13
  48 #define SEPS525_RGBIF 0x14
  49 #define SEPS525_RGB_POL 0x15
  50 #define SEPS525_MEMORY_WRITEMODE 0x16
  51 #define SEPS525_MX1_ADDR 0x17
  52 #define SEPS525_MX2_ADDR 0x18
  53 #define SEPS525_MY1_ADDR 0x19
  54 #define SEPS525_MY2_ADDR 0x1A
  55 #define SEPS525_MEMORY_ACCESS_POINTER_X 0x20
  56 #define SEPS525_MEMORY_ACCESS_POINTER_Y 0x21
  57 #define SEPS525_DDRAM_DATA_ACCESS_PORT 0x22
  58 #define SEPS525_GRAY_SCALE_TABLE_INDEX 0x50
  59 #define SEPS525_GRAY_SCALE_TABLE_DATA 0x51
  60 #define SEPS525_DUTY 0x28
  61 #define SEPS525_DSL 0x29
  62 #define SEPS525_D1_DDRAM_FAC 0x2E
  63 #define SEPS525_D1_DDRAM_FAR 0x2F
  64 #define SEPS525_D2_DDRAM_SAC 0x31
  65 #define SEPS525_D2_DDRAM_SAR 0x32
  66 #define SEPS525_SCR1_FX1 0x33
  67 #define SEPS525_SCR1_FX2 0x34
  68 #define SEPS525_SCR1_FY1 0x35
  69 #define SEPS525_SCR1_FY2 0x36
  70 #define SEPS525_SCR2_SX1 0x37
  71 #define SEPS525_SCR2_SX2 0x38
  72 #define SEPS525_SCR2_SY1 0x39
  73 #define SEPS525_SCR2_SY2 0x3A
  74 #define SEPS525_SCREEN_SAVER_CONTEROL 0x3B
  75 #define SEPS525_SS_SLEEP_TIMER 0x3C
  76 #define SEPS525_SCREEN_SAVER_MODE 0x3D
  77 #define SEPS525_SS_SCR1_FU 0x3E
  78 #define SEPS525_SS_SCR1_MXY 0x3F
  79 #define SEPS525_SS_SCR2_FU 0x40
  80 #define SEPS525_SS_SCR2_MXY 0x41
  81 #define SEPS525_MOVING_DIRECTION 0x42
  82 #define SEPS525_SS_SCR2_SX1 0x47
  83 #define SEPS525_SS_SCR2_SX2 0x48
  84 #define SEPS525_SS_SCR2_SY1 0x49
  85 #define SEPS525_SS_SCR2_SY2 0x4A
  86
  87 /* SEPS525_DISPLAYMODE_SET */
  88 #define MODE_SWAP_BGR   BIT(7)
  89 #define MODE_SM         BIT(6)
  90 #define MODE_RD         BIT(5)
  91 #define MODE_CD         BIT(4)
  92
  93 #define seps525_use_window      0 /* FBTFT doesn't really use it today */
  94
  95 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
  96 static int init_display(struct fbtft_par *par)
  97 {
  98         par->fbtftops.reset(par);
  99
 100         usleep_range(1000, 5000);
 101
 102         /* Disable Oscillator Power Down */
 103         write_reg(par, SEPS525_REDUCE_CURRENT, 0x03);
 104         usleep_range(1000, 5000);
 105         /* Set Normal Driving Current */
 106         write_reg(par, SEPS525_REDUCE_CURRENT, 0x00);
 107         usleep_range(1000, 5000);
 108
 109         write_reg(par, SEPS525_SCREEN_SAVER_CONTEROL, 0x00);
 110         /* Set EXPORT1 Pin at Internal Clock */
 111         write_reg(par, SEPS525_OSC_CTL, 0x01);
 112         /* Set Clock as 120 Frames/Sec */
 113         write_reg(par, SEPS525_CLOCK_DIV, 0x90);
 114         /* Set Reference Voltage Controlled by External Resister */
 115         write_reg(par, SEPS525_IREF, 0x01);
 116
 117         /* precharge time R G B */
 118         write_reg(par, SEPS525_PRECHARGE_TIME_R, 0x04);
 119         write_reg(par, SEPS525_PRECHARGE_TIME_G, 0x05);
 120         write_reg(par, SEPS525_PRECHARGE_TIME_B, 0x05);
 121
 122         /* precharge current R G B (uA) */
 123         write_reg(par, SEPS525_PRECHARGE_CURRENT_R, 0x9D);
 124         write_reg(par, SEPS525_PRECHARGE_CURRENT_G, 0x8C);
 125         write_reg(par, SEPS525_PRECHARGE_CURRENT_B, 0x57);
 126
 127         /* driving current R G B (uA) */
 128         write_reg(par, SEPS525_DRIVING_CURRENT_R, 0x56);
 129         write_reg(par, SEPS525_DRIVING_CURRENT_G, 0x4D);
 130         write_reg(par, SEPS525_DRIVING_CURRENT_B, 0x46);
 131         /* Set Color Sequence */
 132         write_reg(par, SEPS525_DISPLAYMODE_SET, 0xA0);
 133         write_reg(par, SEPS525_RGBIF, 0x01); /* Set MCU Interface Mode */
 134         /* Set Memory Write Mode */
 135         write_reg(par, SEPS525_MEMORY_WRITEMODE, 0x66);
 136         write_reg(par, SEPS525_DUTY, 0x7F); /* 1/128 Duty (0x0F~0x7F) */
 137         /* Set Mapping RAM Display Start Line (0x00~0x7F) */
 138         write_reg(par, SEPS525_DSL, 0x00);
 139         write_reg(par, SEPS525_DISP_ONOFF, 0x01); /* Display On (0x00/0x01) */
 140         /* Set All Internal Register Value as Normal Mode */
 141         write_reg(par, SEPS525_SOFT_RST, 0x00);
 142         /* Set RGB Interface Polarity as Active Low */
 143         write_reg(par, SEPS525_RGB_POL, 0x00);
 144
 145         write_reg(par, SEPS525_DDRAM_DATA_ACCESS_PORT);
 146
 147         return 0;
 148 }
 149
 150 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 151 {
 152         if (seps525_use_window) {
 153                 /* Set Window Xs,Ys Xe,Ye*/
 154                 write_reg(par, SEPS525_MX1_ADDR, xs);
 155                 write_reg(par, SEPS525_MX2_ADDR, xe);
 156                 write_reg(par, SEPS525_MY1_ADDR, ys);
 157                 write_reg(par, SEPS525_MY2_ADDR, ye);
 158         }
 159         /* start position X,Y */
 160         write_reg(par, SEPS525_MEMORY_ACCESS_POINTER_X, xs);
 161         write_reg(par, SEPS525_MEMORY_ACCESS_POINTER_Y, ys);
 162
 163         write_reg(par, SEPS525_DDRAM_DATA_ACCESS_PORT);
 164 }
 165
 166 static int set_var(struct fbtft_par *par)
 167 {
 168         u8 val;
 169
 170         switch (par->info->var.rotate) {
 171         case 0:
 172                 val = 0;
 173                 break;
 174         case 180:
 175                 val = MODE_RD | MODE_CD;
 176                 break;
 177         case 90:
 178         case 270:
 179
 180         default:
 181                 return -EINVAL;
 182         }
 183         /* Memory Access Control  */
 184         write_reg(par, SEPS525_DISPLAYMODE_SET, val |
 185                        (par->bgr ? MODE_SWAP_BGR : 0));
 186
 187         write_reg(par, SEPS525_DDRAM_DATA_ACCESS_PORT);
 188
 189         return 0;
 190 }
 191
 192 static struct fbtft_display display = {
 193         .regwidth = 8,
 194         .width = WIDTH,
 195         .height = HEIGHT,
 196         .fbtftops = {
 197                 .init_display = init_display,
 198                 .set_addr_win = set_addr_win,
 199                 .set_var = set_var,
 200         },
 201 };
 202
 203 FBTFT_REGISTER_DRIVER(DRVNAME, "syncoam,seps525", &display);
 204
 205 MODULE_ALIAS("spi:" DRVNAME);
 206 MODULE_ALIAS("platform:" DRVNAME);
 207 MODULE_ALIAS("spi:seps525");
 208 MODULE_ALIAS("platform:seps525");
 209
 210 MODULE_DESCRIPTION("FB driver for the SEPS525 LCD Controller");
 211 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 212 MODULE_LICENSE("GPL");