1 // SPDX-License-Identifier: GPL-2.0+
3 * FB driver for the SSD1289 LCD Controller
5 * Copyright (C) 2013 Noralf Tronnes
7 * Init sequence taken from ITDB02_Graph16.cpp - (C)2010-2011 Henning Karlsen
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/gpio/consumer.h>
17 #define DRVNAME "fb_ssd1289"
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"
23 static unsigned int reg11 = 0x6040;
24 module_param(reg11, uint, 0000);
25 MODULE_PARM_DESC(reg11, "Register 11h value");
27 static int init_display(struct fbtft_par *par)
29 par->fbtftops.reset(par);
32 gpiod_set_value(par->gpio.cs, 0); /* Activate chip */
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);
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);
69 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
71 switch (par->info->var.rotate) {
72 /* R4Eh - Set GDDRAM X address counter */
73 /* R4Fh - Set GDDRAM Y address counter */
75 write_reg(par, 0x4e, xs);
76 write_reg(par, 0x4f, ys);
79 write_reg(par, 0x4e, par->info->var.xres - 1 - xs);
80 write_reg(par, 0x4f, par->info->var.yres - 1 - ys);
83 write_reg(par, 0x4e, par->info->var.yres - 1 - ys);
84 write_reg(par, 0x4f, xs);
87 write_reg(par, 0x4e, ys);
88 write_reg(par, 0x4f, par->info->var.xres - 1 - xs);
92 /* R22h - RAM data write */
96 static int set_var(struct fbtft_par *par)
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",
106 switch (par->info->var.rotate) {
108 write_reg(par, 0x11, reg11 | 0x30);
111 write_reg(par, 0x11, reg11 | 0x28);
114 write_reg(par, 0x11, reg11 | 0x00);
117 write_reg(par, 0x11, reg11 | 0x18);
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
129 #define CURVE(num, idx) curves[(num) * par->gamma.num_values + (idx)]
130 static int set_gamma(struct fbtft_par *par, u32 *curves)
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,
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];
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));
159 static struct fbtft_display display = {
165 .gamma = DEFAULT_GAMMA,
167 .init_display = init_display,
168 .set_addr_win = set_addr_win,
170 .set_gamma = set_gamma,
174 FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1289", &display);
176 MODULE_ALIAS("spi:" DRVNAME);
177 MODULE_ALIAS("platform:" DRVNAME);
178 MODULE_ALIAS("spi:ssd1289");
179 MODULE_ALIAS("platform:ssd1289");
181 MODULE_DESCRIPTION("FB driver for the SSD1289 LCD Controller");
182 MODULE_AUTHOR("Noralf Tronnes");
183 MODULE_LICENSE("GPL");