1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * FB driver for the SSD1289 LCD Controller 4 * 5 * Copyright (C) 2013 Noralf Tronnes 6 * 7 * Init sequence taken from ITDB02_Graph16.cpp - (C)2010-2011 Henning Karlsen 8 */ 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/gpio/consumer.h> 14 15 #include "fbtft.h" 16 17 #define DRVNAME "fb_ssd1289" 18 #define WIDTH 240 19 #define HEIGHT 320 20 #define DEFAULT_GAMMA "02 03 2 5 7 7 4 2 4 2\n" \ 21 "02 03 2 5 7 5 4 2 4 2" 22 23 static unsigned int reg11 = 0x6040; 24 module_param(reg11, uint, 0000); 25 MODULE_PARM_DESC(reg11, "Register 11h value"); 26 27 static int init_display(struct fbtft_par *par) 28 { 29 par->fbtftops.reset(par); 30 31 if (!par->gpio.cs) 32 gpiod_set_value(par->gpio.cs, 0); /* Activate chip */ 33 34 write_reg(par, 0x00, 0x0001); 35 write_reg(par, 0x03, 0xA8A4); 36 write_reg(par, 0x0C, 0x0000); 37 write_reg(par, 0x0D, 0x080C); 38 write_reg(par, 0x0E, 0x2B00); 39 write_reg(par, 0x1E, 0x00B7); 40 write_reg(par, 0x01, 41 BIT(13) | (par->bgr << 11) | BIT(9) | (HEIGHT - 1)); 42 write_reg(par, 0x02, 0x0600); 43 write_reg(par, 0x10, 0x0000); 44 write_reg(par, 0x05, 0x0000); 45 write_reg(par, 0x06, 0x0000); 46 write_reg(par, 0x16, 0xEF1C); 47 write_reg(par, 0x17, 0x0003); 48 write_reg(par, 0x07, 0x0233); 49 write_reg(par, 0x0B, 0x0000); 50 write_reg(par, 0x0F, 0x0000); 51 write_reg(par, 0x41, 0x0000); 52 write_reg(par, 0x42, 0x0000); 53 write_reg(par, 0x48, 0x0000); 54 write_reg(par, 0x49, 0x013F); 55 write_reg(par, 0x4A, 0x0000); 56 write_reg(par, 0x4B, 0x0000); 57 write_reg(par, 0x44, 0xEF00); 58 write_reg(par, 0x45, 0x0000); 59 write_reg(par, 0x46, 0x013F); 60 write_reg(par, 0x23, 0x0000); 61 write_reg(par, 0x24, 0x0000); 62 write_reg(par, 0x25, 0x8000); 63 write_reg(par, 0x4f, 0x0000); 64 write_reg(par, 0x4e, 0x0000); 65 write_reg(par, 0x22); 66 return 0; 67 } 68 69 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 70 { 71 switch (par->info->var.rotate) { 72 /* R4Eh - Set GDDRAM X address counter */ 73 /* R4Fh - Set GDDRAM Y address counter */ 74 case 0: 75 write_reg(par, 0x4e, xs); 76 write_reg(par, 0x4f, ys); 77 break; 78 case 180: 79 write_reg(par, 0x4e, par->info->var.xres - 1 - xs); 80 write_reg(par, 0x4f, par->info->var.yres - 1 - ys); 81 break; 82 case 270: 83 write_reg(par, 0x4e, par->info->var.yres - 1 - ys); 84 write_reg(par, 0x4f, xs); 85 break; 86 case 90: 87 write_reg(par, 0x4e, ys); 88 write_reg(par, 0x4f, par->info->var.xres - 1 - xs); 89 break; 90 } 91 92 /* R22h - RAM data write */ 93 write_reg(par, 0x22); 94 } 95 96 static int set_var(struct fbtft_par *par) 97 { 98 if (par->fbtftops.init_display != init_display) { 99 /* don't risk messing up register 11h */ 100 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, 101 "%s: skipping since custom init_display() is used\n", 102 __func__); 103 return 0; 104 } 105 106 switch (par->info->var.rotate) { 107 case 0: 108 write_reg(par, 0x11, reg11 | 0x30); 109 break; 110 case 270: 111 write_reg(par, 0x11, reg11 | 0x28); 112 break; 113 case 180: 114 write_reg(par, 0x11, reg11 | 0x00); 115 break; 116 case 90: 117 write_reg(par, 0x11, reg11 | 0x18); 118 break; 119 } 120 121 return 0; 122 } 123 124 /* 125 * Gamma string format: 126 * VRP0 VRP1 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 PKP5 127 * VRN0 VRN1 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 PKN5 128 */ 129 #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)] 130 static int set_gamma(struct fbtft_par *par, u32 *curves) 131 { 132 unsigned long mask[] = { 133 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 134 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 135 }; 136 int i, j; 137 138 /* apply mask */ 139 for (i = 0; i < 2; i++) 140 for (j = 0; j < 10; j++) 141 CURVE(i, j) &= mask[i * par->gamma.num_values + j]; 142 143 write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4)); 144 write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6)); 145 write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8)); 146 write_reg(par, 0x0033, CURVE(0, 3) << 8 | CURVE(0, 2)); 147 write_reg(par, 0x0034, CURVE(1, 5) << 8 | CURVE(1, 4)); 148 write_reg(par, 0x0035, CURVE(1, 7) << 8 | CURVE(1, 6)); 149 write_reg(par, 0x0036, CURVE(1, 9) << 8 | CURVE(1, 8)); 150 write_reg(par, 0x0037, CURVE(1, 3) << 8 | CURVE(1, 2)); 151 write_reg(par, 0x003A, CURVE(0, 1) << 8 | CURVE(0, 0)); 152 write_reg(par, 0x003B, CURVE(1, 1) << 8 | CURVE(1, 0)); 153 154 return 0; 155 } 156 157 #undef CURVE 158 159 static struct fbtft_display display = { 160 .regwidth = 16, 161 .width = WIDTH, 162 .height = HEIGHT, 163 .gamma_num = 2, 164 .gamma_len = 10, 165 .gamma = DEFAULT_GAMMA, 166 .fbtftops = { 167 .init_display = init_display, 168 .set_addr_win = set_addr_win, 169 .set_var = set_var, 170 .set_gamma = set_gamma, 171 }, 172 }; 173 174 FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1289", &display); 175 176 MODULE_ALIAS("spi:" DRVNAME); 177 MODULE_ALIAS("platform:" DRVNAME); 178 MODULE_ALIAS("spi:ssd1289"); 179 MODULE_ALIAS("platform:ssd1289"); 180 181 MODULE_DESCRIPTION("FB driver for the SSD1289 LCD Controller"); 182 MODULE_AUTHOR("Noralf Tronnes"); 183 MODULE_LICENSE("GPL"); 184