drivers/staging/fbtft/fb_ra8875.c

   1 /*
   2  * FBTFT driver for the RA8875 LCD Controller
   3  * Copyright by Pf@nne & NOTRO
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20
  21 #include <linux/gpio.h>
  22 #include "fbtft.h"
  23
  24 #define DRVNAME "fb_ra8875"
  25
  26 static int write_spi(struct fbtft_par *par, void *buf, size_t len)
  27 {
  28         struct spi_transfer t = {
  29                 .tx_buf = buf,
  30                 .len = len,
  31                 .speed_hz = 1000000,
  32         };
  33         struct spi_message m;
  34
  35         fbtft_par_dbg_hex(DEBUG_WRITE, par, par->info->device, u8, buf, len,
  36                 "%s(len=%d): ", __func__, len);
  37
  38         if (!par->spi) {
  39                 dev_err(par->info->device,
  40                         "%s: par->spi is unexpectedly NULL\n", __func__);
  41                 return -1;
  42         }
  43
  44         spi_message_init(&m);
  45         if (par->txbuf.dma && buf == par->txbuf.buf) {
  46                 t.tx_dma = par->txbuf.dma;
  47                 m.is_dma_mapped = 1;
  48         }
  49         spi_message_add_tail(&t, &m);
  50         return spi_sync(par->spi, &m);
  51 }
  52
  53 static int init_display(struct fbtft_par *par)
  54 {
  55         gpio_set_value(par->gpio.dc, 1);
  56
  57         fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
  58                 "%s()\n", __func__);
  59         fbtft_par_dbg(DEBUG_INIT_DISPLAY, par,
  60                 "display size %dx%d\n",
  61                 par->info->var.xres,
  62                 par->info->var.yres);
  63
  64         par->fbtftops.reset(par);
  65
  66         if ((par->info->var.xres == 320) && (par->info->var.yres == 240)) {
  67                 /* PLL clock frequency */
  68                 write_reg(par, 0x88, 0x0A);
  69                 write_reg(par, 0x89, 0x02);
  70                 mdelay(10);
  71                 /* color deep / MCU Interface */
  72                 write_reg(par, 0x10, 0x0C);
  73                 /* pixel clock period  */
  74                 write_reg(par, 0x04, 0x03);
  75                 mdelay(1);
  76                 /* horizontal settings */
  77                 write_reg(par, 0x14, 0x27);
  78                 write_reg(par, 0x15, 0x00);
  79                 write_reg(par, 0x16, 0x05);
  80                 write_reg(par, 0x17, 0x04);
  81                 write_reg(par, 0x18, 0x03);
  82                 /* vertical settings */
  83                 write_reg(par, 0x19, 0xEF);
  84                 write_reg(par, 0x1A, 0x00);
  85                 write_reg(par, 0x1B, 0x05);
  86                 write_reg(par, 0x1C, 0x00);
  87                 write_reg(par, 0x1D, 0x0E);
  88                 write_reg(par, 0x1E, 0x00);
  89                 write_reg(par, 0x1F, 0x02);
  90         } else if ((par->info->var.xres == 480) &&
  91                    (par->info->var.yres == 272)) {
  92                 /* PLL clock frequency  */
  93                 write_reg(par, 0x88, 0x0A);
  94                 write_reg(par, 0x89, 0x02);
  95                 mdelay(10);
  96                 /* color deep / MCU Interface */
  97                 write_reg(par, 0x10, 0x0C);
  98                 /* pixel clock period  */
  99                 write_reg(par, 0x04, 0x82);
 100                 mdelay(1);
 101                 /* horizontal settings */
 102                 write_reg(par, 0x14, 0x3B);
 103                 write_reg(par, 0x15, 0x00);
 104                 write_reg(par, 0x16, 0x01);
 105                 write_reg(par, 0x17, 0x00);
 106                 write_reg(par, 0x18, 0x05);
 107                 /* vertical settings */
 108                 write_reg(par, 0x19, 0x0F);
 109                 write_reg(par, 0x1A, 0x01);
 110                 write_reg(par, 0x1B, 0x02);
 111                 write_reg(par, 0x1C, 0x00);
 112                 write_reg(par, 0x1D, 0x07);
 113                 write_reg(par, 0x1E, 0x00);
 114                 write_reg(par, 0x1F, 0x09);
 115         } else if ((par->info->var.xres == 640) &&
 116                    (par->info->var.yres == 480)) {
 117                 /* PLL clock frequency */
 118                 write_reg(par, 0x88, 0x0B);
 119                 write_reg(par, 0x89, 0x02);
 120                 mdelay(10);
 121                 /* color deep / MCU Interface */
 122                 write_reg(par, 0x10, 0x0C);
 123                 /* pixel clock period */
 124                 write_reg(par, 0x04, 0x01);
 125                 mdelay(1);
 126                 /* horizontal settings */
 127                 write_reg(par, 0x14, 0x4F);
 128                 write_reg(par, 0x15, 0x05);
 129                 write_reg(par, 0x16, 0x0F);
 130                 write_reg(par, 0x17, 0x01);
 131                 write_reg(par, 0x18, 0x00);
 132                 /* vertical settings */
 133                 write_reg(par, 0x19, 0xDF);
 134                 write_reg(par, 0x1A, 0x01);
 135                 write_reg(par, 0x1B, 0x0A);
 136                 write_reg(par, 0x1C, 0x00);
 137                 write_reg(par, 0x1D, 0x0E);
 138                 write_reg(par, 0x1E, 0x00);
 139                 write_reg(par, 0x1F, 0x01);
 140         } else if ((par->info->var.xres == 800) &&
 141                    (par->info->var.yres == 480)) {
 142                 /* PLL clock frequency */
 143                 write_reg(par, 0x88, 0x0B);
 144                 write_reg(par, 0x89, 0x02);
 145                 mdelay(10);
 146                 /* color deep / MCU Interface */
 147                 write_reg(par, 0x10, 0x0C);
 148                 /* pixel clock period */
 149                 write_reg(par, 0x04, 0x81);
 150                 mdelay(1);
 151                 /* horizontal settings */
 152                 write_reg(par, 0x14, 0x63);
 153                 write_reg(par, 0x15, 0x03);
 154                 write_reg(par, 0x16, 0x03);
 155                 write_reg(par, 0x17, 0x02);
 156                 write_reg(par, 0x18, 0x00);
 157                 /* vertical settings */
 158                 write_reg(par, 0x19, 0xDF);
 159                 write_reg(par, 0x1A, 0x01);
 160                 write_reg(par, 0x1B, 0x14);
 161                 write_reg(par, 0x1C, 0x00);
 162                 write_reg(par, 0x1D, 0x06);
 163                 write_reg(par, 0x1E, 0x00);
 164                 write_reg(par, 0x1F, 0x01);
 165         } else {
 166                 dev_err(par->info->device, "display size is not supported!!");
 167                 return -1;
 168         }
 169
 170         /* PWM clock */
 171         write_reg(par, 0x8a, 0x81);
 172         write_reg(par, 0x8b, 0xFF);
 173         mdelay(10);
 174
 175         /* Display ON */
 176         write_reg(par, 0x01, 0x80);
 177         mdelay(10);
 178
 179         return 0;
 180 }
 181
 182 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 183 {
 184         /* Set_Active_Window */
 185         write_reg(par, 0x30, xs & 0x00FF);
 186         write_reg(par, 0x31, (xs & 0xFF00) >> 8);
 187         write_reg(par, 0x32, ys & 0x00FF);
 188         write_reg(par, 0x33, (ys & 0xFF00) >> 8);
 189         write_reg(par, 0x34, (xs + xe) & 0x00FF);
 190         write_reg(par, 0x35, ((xs + xe) & 0xFF00) >> 8);
 191         write_reg(par, 0x36, (ys + ye) & 0x00FF);
 192         write_reg(par, 0x37, ((ys + ye) & 0xFF00) >> 8);
 193
 194         /* Set_Memory_Write_Cursor */
 195         write_reg(par, 0x46,  xs & 0xff);
 196         write_reg(par, 0x47, (xs >> 8) & 0x03);
 197         write_reg(par, 0x48,  ys & 0xff);
 198         write_reg(par, 0x49, (ys >> 8) & 0x01);
 199
 200         write_reg(par, 0x02);
 201 }
 202
 203 static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
 204 {
 205         va_list args;
 206         int i, ret;
 207         u8 *buf = par->buf;
 208
 209         /* slow down spi-speed for writing registers */
 210         par->fbtftops.write = write_spi;
 211
 212         if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
 213                 va_start(args, len);
 214                 for (i = 0; i < len; i++)
 215                         buf[i] = (u8)va_arg(args, unsigned int);
 216                 va_end(args);
 217                 fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device,
 218                         u8, buf, len, "%s: ", __func__);
 219         }
 220
 221         va_start(args, len);
 222         *buf++ = 0x80;
 223         *buf = (u8)va_arg(args, unsigned int);
 224         ret = par->fbtftops.write(par, par->buf, 2);
 225         if (ret < 0) {
 226                 va_end(args);
 227                 dev_err(par->info->device, "write() failed and returned %dn",
 228                         ret);
 229                 return;
 230         }
 231         len--;
 232
 233         udelay(100);
 234
 235         if (len) {
 236                 buf = (u8 *)par->buf;
 237                 *buf++ = 0x00;
 238                 i = len;
 239                 while (i--)
 240                         *buf++ = (u8)va_arg(args, unsigned int);
 241
 242                 ret = par->fbtftops.write(par, par->buf, len + 1);
 243                 if (ret < 0) {
 244                         va_end(args);
 245                         dev_err(par->info->device,
 246                                 "write() failed and returned %dn", ret);
 247                         return;
 248                 }
 249         }
 250         va_end(args);
 251
 252         /* restore user spi-speed */
 253         par->fbtftops.write = fbtft_write_spi;
 254         udelay(100);
 255 }
 256
 257 static int write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
 258 {
 259         u16 *vmem16;
 260         u16 *txbuf16 = (u16 *)par->txbuf.buf;
 261         size_t remain;
 262         size_t to_copy;
 263         size_t tx_array_size;
 264         int i;
 265         int ret = 0;
 266         size_t startbyte_size = 0;
 267
 268         fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s(offset=%zu, len=%zu)\n",
 269                 __func__, offset, len);
 270
 271         remain = len / 2;
 272         vmem16 = (u16 *)(par->info->screen_buffer + offset);
 273         tx_array_size = par->txbuf.len / 2;
 274                 txbuf16 = (u16 *)(par->txbuf.buf + 1);
 275                 tx_array_size -= 2;
 276                 *(u8 *)(par->txbuf.buf) = 0x00;
 277                 startbyte_size = 1;
 278
 279         while (remain) {
 280                 to_copy = remain > tx_array_size ? tx_array_size : remain;
 281                 dev_dbg(par->info->device, "    to_copy=%zu, remain=%zu\n",
 282                         to_copy, remain - to_copy);
 283
 284                 for (i = 0; i < to_copy; i++)
 285                         txbuf16[i] = cpu_to_be16(vmem16[i]);
 286
 287                 vmem16 = vmem16 + to_copy;
 288                 ret = par->fbtftops.write(par, par->txbuf.buf,
 289                         startbyte_size + to_copy * 2);
 290                 if (ret < 0)
 291                         return ret;
 292                 remain -= to_copy;
 293         }
 294
 295         return ret;
 296 }
 297
 298 static struct fbtft_display display = {
 299         .regwidth = 8,
 300         .fbtftops = {
 301                 .init_display = init_display,
 302                 .set_addr_win = set_addr_win,
 303                 .write_register = write_reg8_bus8,
 304                 .write_vmem = write_vmem16_bus8,
 305                 .write = write_spi,
 306         },
 307 };
 308
 309 FBTFT_REGISTER_DRIVER(DRVNAME, "raio,ra8875", &display);
 310
 311 MODULE_ALIAS("spi:" DRVNAME);
 312 MODULE_ALIAS("platform:" DRVNAME);
 313 MODULE_ALIAS("spi:ra8875");
 314 MODULE_ALIAS("platform:ra8875");
 315
 316 MODULE_DESCRIPTION("FB driver for the RA8875 LCD Controller");
 317 MODULE_AUTHOR("Pf@nne");
 318 MODULE_LICENSE("GPL");