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 | |
22 | static unsigned int reg11 = 0x6040; |
23 | module_param(reg11, uint, 0000); |
24 | MODULE_PARM_DESC(reg11, "Register 11h value" ); |
25 | |
26 | static 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 | |
65 | static 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 | |
92 | static 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)] |
126 | static 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 | |
155 | static 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 | |
170 | FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1289" , &display); |
171 | |
172 | MODULE_ALIAS("spi:" DRVNAME); |
173 | MODULE_ALIAS("platform:" DRVNAME); |
174 | MODULE_ALIAS("spi:ssd1289" ); |
175 | MODULE_ALIAS("platform:ssd1289" ); |
176 | |
177 | MODULE_DESCRIPTION("FB driver for the SSD1289 LCD Controller" ); |
178 | MODULE_AUTHOR("Noralf Tronnes" ); |
179 | MODULE_LICENSE("GPL" ); |
180 | |