drivers/video/atmel_hlcdfb.c

   1 /*
   2  * Driver for AT91/AT32 MULTI LAYER LCD Controller
   3  *
   4  * Copyright (C) 2012 Atmel Corporation
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <asm/io.h>
  27 #include <asm/arch/gpio.h>
  28 #include <asm/arch/clk.h>
  29 #include <lcd.h>
  30 #include <atmel_hlcdc.h>
  31
  32 int lcd_line_length;
  33
  34 void *lcd_base;                         /* Start of framebuffer memory  */
  35 void *lcd_console_address;              /* Start of console buffer      */
  36
  37 short console_col;
  38 short console_row;
  39
  40 /* configurable parameters */
  41 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  42 #define ATMEL_LCDC_DMA_BURST_LEN        8
  43 #ifndef ATMEL_LCDC_GUARD_TIME
  44 #define ATMEL_LCDC_GUARD_TIME           1
  45 #endif
  46
  47 #define ATMEL_LCDC_FIFO_SIZE            512
  48
  49 #define lcdc_readl(reg)         __raw_readl((reg))
  50 #define lcdc_writel(reg, val)   __raw_writel((val), (reg))
  51
  52 /*
  53  * the CLUT register map as following
  54  * RCLUT(24 ~ 16), GCLUT(15 ~ 8), BCLUT(7 ~ 0)
  55  */
  56 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
  57 {
  58         lcdc_writel(((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk)
  59                 | ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk)
  60                 | ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk),
  61                 panel_info.mmio + ATMEL_LCDC_LUT(regno));
  62 }
  63
  64 void lcd_ctrl_init(void *lcdbase)
  65 {
  66         unsigned long value;
  67         struct lcd_dma_desc *desc;
  68         struct atmel_hlcd_regs *regs;
  69
  70         if (!has_lcdc())
  71                 return;     /* No lcdc */
  72
  73         regs = (struct atmel_hlcd_regs *)panel_info.mmio;
  74
  75         /* Disable DISP signal */
  76         lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_DISPDIS);
  77         while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
  78                 udelay(1);
  79         /* Disable synchronization */
  80         lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_SYNCDIS);
  81         while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
  82                 udelay(1);
  83         /* Disable pixel clock */
  84         lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_CLKDIS);
  85         while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
  86                 udelay(1);
  87         /* Disable PWM */
  88         lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_PWMDIS);
  89         while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
  90                 udelay(1);
  91
  92         /* Set pixel clock */
  93         value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
  94         if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
  95                 value++;
  96
  97         if (value < 1) {
  98                 /* Using system clock as pixel clock */
  99                 lcdc_writel(&regs->lcdc_lcdcfg0,
 100                                         LCDC_LCDCFG0_CLKDIV(0)
 101                                         | LCDC_LCDCFG0_CGDISHCR
 102                                         | LCDC_LCDCFG0_CGDISHEO
 103                                         | LCDC_LCDCFG0_CGDISOVR1
 104                                         | LCDC_LCDCFG0_CGDISBASE
 105                                         | panel_info.vl_clk_pol
 106                                         | LCDC_LCDCFG0_CLKSEL);
 107
 108         } else {
 109                 lcdc_writel(&regs->lcdc_lcdcfg0,
 110                                 LCDC_LCDCFG0_CLKDIV(value - 2)
 111                                 | LCDC_LCDCFG0_CGDISHCR
 112                                 | LCDC_LCDCFG0_CGDISHEO
 113                                 | LCDC_LCDCFG0_CGDISOVR1
 114                                 | LCDC_LCDCFG0_CGDISBASE
 115                                 | panel_info.vl_clk_pol);
 116         }
 117
 118         /* Initialize control register 5 */
 119         value = 0;
 120
 121         value |= panel_info.vl_sync;
 122
 123 #ifndef LCD_OUTPUT_BPP
 124         /* Output is 24bpp */
 125         value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
 126 #else
 127         switch (LCD_OUTPUT_BPP) {
 128         case 12:
 129                 value |= LCDC_LCDCFG5_MODE_OUTPUT_12BPP;
 130                 break;
 131         case 16:
 132                 value |= LCDC_LCDCFG5_MODE_OUTPUT_16BPP;
 133                 break;
 134         case 18:
 135                 value |= LCDC_LCDCFG5_MODE_OUTPUT_18BPP;
 136                 break;
 137         case 24:
 138                 value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
 139                 break;
 140         default:
 141                 BUG();
 142                 break;
 143         }
 144 #endif
 145
 146         value |= LCDC_LCDCFG5_GUARDTIME(ATMEL_LCDC_GUARD_TIME);
 147         value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS);
 148         lcdc_writel(&regs->lcdc_lcdcfg5, value);
 149
 150         /* Vertical & Horizontal Timing */
 151         value = LCDC_LCDCFG1_VSPW(panel_info.vl_vsync_len - 1);
 152         value |= LCDC_LCDCFG1_HSPW(panel_info.vl_hsync_len - 1);
 153         lcdc_writel(&regs->lcdc_lcdcfg1, value);
 154
 155         value = LCDC_LCDCFG2_VBPW(panel_info.vl_lower_margin);
 156         value |= LCDC_LCDCFG2_VFPW(panel_info.vl_upper_margin - 1);
 157         lcdc_writel(&regs->lcdc_lcdcfg2, value);
 158
 159         value = LCDC_LCDCFG3_HBPW(panel_info.vl_right_margin - 1);
 160         value |= LCDC_LCDCFG3_HFPW(panel_info.vl_left_margin - 1);
 161         lcdc_writel(&regs->lcdc_lcdcfg3, value);
 162
 163         /* Display size */
 164         value = LCDC_LCDCFG4_RPF(panel_info.vl_row - 1);
 165         value |= LCDC_LCDCFG4_PPL(panel_info.vl_col - 1);
 166         lcdc_writel(&regs->lcdc_lcdcfg4, value);
 167
 168         lcdc_writel(&regs->lcdc_basecfg0,
 169                         LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO);
 170
 171         switch (NBITS(panel_info.vl_bpix)) {
 172         case 16:
 173                 lcdc_writel(&regs->lcdc_basecfg1,
 174                         LCDC_BASECFG1_RGBMODE_16BPP_RGB_565);
 175                 break;
 176         default:
 177                 BUG();
 178                 break;
 179         }
 180
 181         lcdc_writel(&regs->lcdc_basecfg2, LCDC_BASECFG2_XSTRIDE(0));
 182         lcdc_writel(&regs->lcdc_basecfg3, 0);
 183         lcdc_writel(&regs->lcdc_basecfg4, LCDC_BASECFG4_DMA);
 184
 185         /* Disable all interrupts */
 186         lcdc_writel(&regs->lcdc_lcdidr, ~0UL);
 187         lcdc_writel(&regs->lcdc_baseidr, ~0UL);
 188
 189         /* Setup the DMA descriptor, this descriptor will loop to itself */
 190         desc = (struct lcd_dma_desc *)(lcdbase - 16);
 191
 192         desc->address = (u32)lcdbase;
 193         /* Disable DMA transfer interrupt & descriptor loaded interrupt. */
 194         desc->control = LCDC_BASECTRL_ADDIEN | LCDC_BASECTRL_DSCRIEN
 195                         | LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH;
 196         desc->next = (u32)desc;
 197
 198         lcdc_writel(&regs->lcdc_baseaddr, desc->address);
 199         lcdc_writel(&regs->lcdc_basectrl, desc->control);
 200         lcdc_writel(&regs->lcdc_basenext, desc->next);
 201         lcdc_writel(&regs->lcdc_basecher, LCDC_BASECHER_CHEN |
 202                                           LCDC_BASECHER_UPDATEEN);
 203
 204         /* Enable LCD */
 205         value = lcdc_readl(&regs->lcdc_lcden);
 206         lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_CLKEN);
 207         while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
 208                 udelay(1);
 209         value = lcdc_readl(&regs->lcdc_lcden);
 210         lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_SYNCEN);
 211         while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
 212                 udelay(1);
 213         value = lcdc_readl(&regs->lcdc_lcden);
 214         lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_DISPEN);
 215         while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
 216                 udelay(1);
 217         value = lcdc_readl(&regs->lcdc_lcden);
 218         lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_PWMEN);
 219         while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
 220                 udelay(1);
 221 }