drivers/staging/fbtft/fb_ssd1289.c

   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         static const 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");