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