1 /* 2 * Driver for AT91/AT32 MULTI LAYER LCD Controller 3 * 4 * Copyright (C) 2012 Atmel Corporation 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <asm/io.h> 11 #include <asm/arch/gpio.h> 12 #include <asm/arch/clk.h> 13 #include <lcd.h> 14 #include <atmel_hlcdc.h> 15 16 /* configurable parameters */ 17 #define ATMEL_LCDC_CVAL_DEFAULT 0xc8 18 #define ATMEL_LCDC_DMA_BURST_LEN 8 19 #ifndef ATMEL_LCDC_GUARD_TIME 20 #define ATMEL_LCDC_GUARD_TIME 1 21 #endif 22 23 #define ATMEL_LCDC_FIFO_SIZE 512 24 25 #define lcdc_readl(reg) __raw_readl((reg)) 26 #define lcdc_writel(reg, val) __raw_writel((val), (reg)) 27 28 /* 29 * the CLUT register map as following 30 * RCLUT(24 ~ 16), GCLUT(15 ~ 8), BCLUT(7 ~ 0) 31 */ 32 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) 33 { 34 lcdc_writel(((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk) 35 | ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk) 36 | ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk), 37 panel_info.mmio + ATMEL_LCDC_LUT(regno)); 38 } 39 40 void lcd_ctrl_init(void *lcdbase) 41 { 42 unsigned long value; 43 struct lcd_dma_desc *desc; 44 struct atmel_hlcd_regs *regs; 45 46 if (!has_lcdc()) 47 return; /* No lcdc */ 48 49 regs = (struct atmel_hlcd_regs *)panel_info.mmio; 50 51 /* Disable DISP signal */ 52 lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_DISPDIS); 53 while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS)) 54 udelay(1); 55 /* Disable synchronization */ 56 lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_SYNCDIS); 57 while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS)) 58 udelay(1); 59 /* Disable pixel clock */ 60 lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_CLKDIS); 61 while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS)) 62 udelay(1); 63 /* Disable PWM */ 64 lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_PWMDIS); 65 while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS)) 66 udelay(1); 67 68 /* Set pixel clock */ 69 value = get_lcdc_clk_rate(0) / panel_info.vl_clk; 70 if (get_lcdc_clk_rate(0) % panel_info.vl_clk) 71 value++; 72 73 if (value < 1) { 74 /* Using system clock as pixel clock */ 75 lcdc_writel(®s->lcdc_lcdcfg0, 76 LCDC_LCDCFG0_CLKDIV(0) 77 | LCDC_LCDCFG0_CGDISHCR 78 | LCDC_LCDCFG0_CGDISHEO 79 | LCDC_LCDCFG0_CGDISOVR1 80 | LCDC_LCDCFG0_CGDISBASE 81 | panel_info.vl_clk_pol 82 | LCDC_LCDCFG0_CLKSEL); 83 84 } else { 85 lcdc_writel(®s->lcdc_lcdcfg0, 86 LCDC_LCDCFG0_CLKDIV(value - 2) 87 | LCDC_LCDCFG0_CGDISHCR 88 | LCDC_LCDCFG0_CGDISHEO 89 | LCDC_LCDCFG0_CGDISOVR1 90 | LCDC_LCDCFG0_CGDISBASE 91 | panel_info.vl_clk_pol); 92 } 93 94 /* Initialize control register 5 */ 95 value = 0; 96 97 value |= panel_info.vl_sync; 98 99 #ifndef LCD_OUTPUT_BPP 100 /* Output is 24bpp */ 101 value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP; 102 #else 103 switch (LCD_OUTPUT_BPP) { 104 case 12: 105 value |= LCDC_LCDCFG5_MODE_OUTPUT_12BPP; 106 break; 107 case 16: 108 value |= LCDC_LCDCFG5_MODE_OUTPUT_16BPP; 109 break; 110 case 18: 111 value |= LCDC_LCDCFG5_MODE_OUTPUT_18BPP; 112 break; 113 case 24: 114 value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP; 115 break; 116 default: 117 BUG(); 118 break; 119 } 120 #endif 121 122 value |= LCDC_LCDCFG5_GUARDTIME(ATMEL_LCDC_GUARD_TIME); 123 value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS); 124 lcdc_writel(®s->lcdc_lcdcfg5, value); 125 126 /* Vertical & Horizontal Timing */ 127 value = LCDC_LCDCFG1_VSPW(panel_info.vl_vsync_len - 1); 128 value |= LCDC_LCDCFG1_HSPW(panel_info.vl_hsync_len - 1); 129 lcdc_writel(®s->lcdc_lcdcfg1, value); 130 131 value = LCDC_LCDCFG2_VBPW(panel_info.vl_upper_margin); 132 value |= LCDC_LCDCFG2_VFPW(panel_info.vl_lower_margin - 1); 133 lcdc_writel(®s->lcdc_lcdcfg2, value); 134 135 value = LCDC_LCDCFG3_HBPW(panel_info.vl_left_margin - 1); 136 value |= LCDC_LCDCFG3_HFPW(panel_info.vl_right_margin - 1); 137 lcdc_writel(®s->lcdc_lcdcfg3, value); 138 139 /* Display size */ 140 value = LCDC_LCDCFG4_RPF(panel_info.vl_row - 1); 141 value |= LCDC_LCDCFG4_PPL(panel_info.vl_col - 1); 142 lcdc_writel(®s->lcdc_lcdcfg4, value); 143 144 lcdc_writel(®s->lcdc_basecfg0, 145 LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO); 146 147 switch (NBITS(panel_info.vl_bpix)) { 148 case 16: 149 lcdc_writel(®s->lcdc_basecfg1, 150 LCDC_BASECFG1_RGBMODE_16BPP_RGB_565); 151 break; 152 default: 153 BUG(); 154 break; 155 } 156 157 lcdc_writel(®s->lcdc_basecfg2, LCDC_BASECFG2_XSTRIDE(0)); 158 lcdc_writel(®s->lcdc_basecfg3, 0); 159 lcdc_writel(®s->lcdc_basecfg4, LCDC_BASECFG4_DMA); 160 161 /* Disable all interrupts */ 162 lcdc_writel(®s->lcdc_lcdidr, ~0UL); 163 lcdc_writel(®s->lcdc_baseidr, ~0UL); 164 165 /* Setup the DMA descriptor, this descriptor will loop to itself */ 166 desc = (struct lcd_dma_desc *)(lcdbase - 16); 167 168 desc->address = (u32)lcdbase; 169 /* Disable DMA transfer interrupt & descriptor loaded interrupt. */ 170 desc->control = LCDC_BASECTRL_ADDIEN | LCDC_BASECTRL_DSCRIEN 171 | LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH; 172 desc->next = (u32)desc; 173 174 /* Flush the DMA descriptor if we enabled dcache */ 175 flush_dcache_range((u32)desc, (u32)desc + sizeof(*desc)); 176 177 lcdc_writel(®s->lcdc_baseaddr, desc->address); 178 lcdc_writel(®s->lcdc_basectrl, desc->control); 179 lcdc_writel(®s->lcdc_basenext, desc->next); 180 lcdc_writel(®s->lcdc_basecher, LCDC_BASECHER_CHEN | 181 LCDC_BASECHER_UPDATEEN); 182 183 /* Enable LCD */ 184 value = lcdc_readl(®s->lcdc_lcden); 185 lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_CLKEN); 186 while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS)) 187 udelay(1); 188 value = lcdc_readl(®s->lcdc_lcden); 189 lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_SYNCEN); 190 while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS)) 191 udelay(1); 192 value = lcdc_readl(®s->lcdc_lcden); 193 lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_DISPEN); 194 while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS)) 195 udelay(1); 196 value = lcdc_readl(®s->lcdc_lcden); 197 lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_PWMEN); 198 while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS)) 199 udelay(1); 200 201 /* Enable flushing if we enabled dcache */ 202 lcd_set_flush_dcache(1); 203 } 204