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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 | // SPDX-License-Identifier: GPL-2.0+ /* * FB driver for the ILI9325 LCD Controller * * Copyright (C) 2013 Noralf Tronnes * * Based on ili9325.c by Jeroen Domburg */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include "fbtft.h" #define DRVNAME "fb_ili9325" #define WIDTH 240 #define HEIGHT 320 #define BPP 16 #define FPS 20 #define DEFAULT_GAMMA "0F 00 7 2 0 0 6 5 4 1\n" \ "04 16 2 7 6 3 2 1 7 7" static unsigned int bt = 6; /* VGL=Vci*4 , VGH=Vci*4 */ module_param(bt, uint, 0000); MODULE_PARM_DESC(bt, "Sets the factor used in the step-up circuits"); static unsigned int vc = 0x03; /* Vci1=Vci*0.80 */ module_param(vc, uint, 0000); MODULE_PARM_DESC(vc, "Sets the ratio factor of Vci to generate the reference voltages Vci1"); static unsigned int vrh = 0x0d; /* VREG1OUT=Vci*1.85 */ module_param(vrh, uint, 0000); MODULE_PARM_DESC(vrh, "Set the amplifying rate (1.6 ~ 1.9) of Vci applied to output the VREG1OUT"); static unsigned int vdv = 0x12; /* VCOMH amplitude=VREG1OUT*0.98 */ module_param(vdv, uint, 0000); MODULE_PARM_DESC(vdv, "Select the factor of VREG1OUT to set the amplitude of Vcom"); static unsigned int vcm = 0x0a; /* VCOMH=VREG1OUT*0.735 */ module_param(vcm, uint, 0000); MODULE_PARM_DESC(vcm, "Set the internal VcomH voltage"); /* * Verify that this configuration is within the Voltage limits * * Display module configuration: Vcc = IOVcc = Vci = 3.3V * * Voltages * ---------- * Vci = 3.3 * Vci1 = Vci * 0.80 = 2.64 * DDVDH = Vci1 * 2 = 5.28 * VCL = -Vci1 = -2.64 * VREG1OUT = Vci * 1.85 = 4.88 * VCOMH = VREG1OUT * 0.735 = 3.59 * VCOM amplitude = VREG1OUT * 0.98 = 4.79 * VGH = Vci * 4 = 13.2 * VGL = -Vci * 4 = -13.2 * * Limits * -------- * Power supplies * 1.65 < IOVcc < 3.30 => 1.65 < 3.3 < 3.30 * 2.40 < Vcc < 3.30 => 2.40 < 3.3 < 3.30 * 2.50 < Vci < 3.30 => 2.50 < 3.3 < 3.30 * * Source/VCOM power supply voltage * 4.50 < DDVDH < 6.0 => 4.50 < 5.28 < 6.0 * -3.0 < VCL < -2.0 => -3.0 < -2.64 < -2.0 * VCI - VCL < 6.0 => 5.94 < 6.0 * * Gate driver output voltage * 10 < VGH < 20 => 10 < 13.2 < 20 * -15 < VGL < -5 => -15 < -13.2 < -5 * VGH - VGL < 32 => 26.4 < 32 * * VCOM driver output voltage * VCOMH - VCOML < 6.0 => 4.79 < 6.0 */ static int init_display(struct fbtft_par *par) { par->fbtftops.reset(par); bt &= 0x07; vc &= 0x07; vrh &= 0x0f; vdv &= 0x1f; vcm &= 0x3f; /* Initialization sequence from ILI9325 Application Notes */ /* ----------- Start Initial Sequence ----------- */ write_reg(par, 0x00E3, 0x3008); /* Set internal timing */ write_reg(par, 0x00E7, 0x0012); /* Set internal timing */ write_reg(par, 0x00EF, 0x1231); /* Set internal timing */ write_reg(par, 0x0001, 0x0100); /* set SS and SM bit */ write_reg(par, 0x0002, 0x0700); /* set 1 line inversion */ write_reg(par, 0x0004, 0x0000); /* Resize register */ write_reg(par, 0x0008, 0x0207); /* set the back porch and front porch */ write_reg(par, 0x0009, 0x0000); /* set non-display area refresh cycle */ write_reg(par, 0x000A, 0x0000); /* FMARK function */ write_reg(par, 0x000C, 0x0000); /* RGB interface setting */ write_reg(par, 0x000D, 0x0000); /* Frame marker Position */ write_reg(par, 0x000F, 0x0000); /* RGB interface polarity */ /* ----------- Power On sequence ----------- */ write_reg(par, 0x0010, 0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */ write_reg(par, 0x0011, 0x0007); /* DC1[2:0], DC0[2:0], VC[2:0] */ write_reg(par, 0x0012, 0x0000); /* VREG1OUT voltage */ write_reg(par, 0x0013, 0x0000); /* VDV[4:0] for VCOM amplitude */ mdelay(200); /* Dis-charge capacitor power voltage */ write_reg(par, 0x0010, /* SAP, BT[3:0], AP, DSTB, SLP, STB */ BIT(12) | (bt << 8) | BIT(7) | BIT(4)); write_reg(par, 0x0011, 0x220 | vc); /* DC1[2:0], DC0[2:0], VC[2:0] */ mdelay(50); /* Delay 50ms */ write_reg(par, 0x0012, vrh); /* Internal reference voltage= Vci; */ mdelay(50); /* Delay 50ms */ write_reg(par, 0x0013, vdv << 8); /* Set VDV[4:0] for VCOM amplitude */ write_reg(par, 0x0029, vcm); /* Set VCM[5:0] for VCOMH */ write_reg(par, 0x002B, 0x000C); /* Set Frame Rate */ mdelay(50); /* Delay 50ms */ write_reg(par, 0x0020, 0x0000); /* GRAM horizontal Address */ write_reg(par, 0x0021, 0x0000); /* GRAM Vertical Address */ /*------------------ Set GRAM area --------------- */ write_reg(par, 0x0050, 0x0000); /* Horizontal GRAM Start Address */ write_reg(par, 0x0051, 0x00EF); /* Horizontal GRAM End Address */ write_reg(par, 0x0052, 0x0000); /* Vertical GRAM Start Address */ write_reg(par, 0x0053, 0x013F); /* Vertical GRAM Start Address */ write_reg(par, 0x0060, 0xA700); /* Gate Scan Line */ write_reg(par, 0x0061, 0x0001); /* NDL,VLE, REV */ write_reg(par, 0x006A, 0x0000); /* set scrolling line */ /*-------------- Partial Display Control --------- */ write_reg(par, 0x0080, 0x0000); write_reg(par, 0x0081, 0x0000); write_reg(par, 0x0082, 0x0000); write_reg(par, 0x0083, 0x0000); write_reg(par, 0x0084, 0x0000); write_reg(par, 0x0085, 0x0000); /*-------------- Panel Control ------------------- */ write_reg(par, 0x0090, 0x0010); write_reg(par, 0x0092, 0x0600); write_reg(par, 0x0007, 0x0133); /* 262K color and display ON */ return 0; } static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) { switch (par->info->var.rotate) { /* R20h = Horizontal GRAM Start Address */ /* R21h = Vertical GRAM Start Address */ case 0: write_reg(par, 0x0020, xs); write_reg(par, 0x0021, ys); break; case 180: write_reg(par, 0x0020, WIDTH - 1 - xs); write_reg(par, 0x0021, HEIGHT - 1 - ys); break; case 270: write_reg(par, 0x0020, WIDTH - 1 - ys); write_reg(par, 0x0021, xs); break; case 90: write_reg(par, 0x0020, ys); write_reg(par, 0x0021, HEIGHT - 1 - xs); break; } write_reg(par, 0x0022); /* 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, 0x03, 0x0030 | (par->bgr << 12)); break; case 180: write_reg(par, 0x03, 0x0000 | (par->bgr << 12)); break; case 270: write_reg(par, 0x03, 0x0028 | (par->bgr << 12)); break; case 90: write_reg(par, 0x03, 0x0018 | (par->bgr << 12)); break; } return 0; } /* * Gamma string format: * VRP0 VRP1 RP0 RP1 KP0 KP1 KP2 KP3 KP4 KP5 * VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5 */ #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)] static int set_gamma(struct fbtft_par *par, u32 *curves) { static const unsigned long mask[] = { 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, }; int i, j; /* apply mask */ for (i = 0; i < 2; i++) for (j = 0; j < 10; j++) CURVE(i, j) &= mask[i * par->gamma.num_values + j]; write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4)); write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6)); write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8)); write_reg(par, 0x0035, CURVE(0, 3) << 8 | CURVE(0, 2)); write_reg(par, 0x0036, CURVE(0, 1) << 8 | CURVE(0, 0)); write_reg(par, 0x0037, CURVE(1, 5) << 8 | CURVE(1, 4)); write_reg(par, 0x0038, CURVE(1, 7) << 8 | CURVE(1, 6)); write_reg(par, 0x0039, CURVE(1, 9) << 8 | CURVE(1, 8)); write_reg(par, 0x003C, CURVE(1, 3) << 8 | CURVE(1, 2)); write_reg(par, 0x003D, CURVE(1, 1) << 8 | CURVE(1, 0)); return 0; } #undef CURVE static struct fbtft_display display = { .regwidth = 16, .width = WIDTH, .height = HEIGHT, .bpp = BPP, .fps = FPS, .gamma_num = 2, .gamma_len = 10, .gamma = DEFAULT_GAMMA, .fbtftops = { .init_display = init_display, .set_addr_win = set_addr_win, .set_var = set_var, .set_gamma = set_gamma, }, }; FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9325", &display); MODULE_ALIAS("spi:" DRVNAME); MODULE_ALIAS("platform:" DRVNAME); MODULE_ALIAS("spi:ili9325"); MODULE_ALIAS("platform:ili9325"); MODULE_DESCRIPTION("FB driver for the ILI9325 LCD Controller"); MODULE_AUTHOR("Noralf Tronnes"); MODULE_LICENSE("GPL"); |