1 /* 2 * Freescale i.MX23/i.MX28 LCDIF driver 3 * 4 * Copyright (C) 2011-2013 Marek Vasut <marex@denx.de> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 #include <common.h> 9 #include <malloc.h> 10 #include <video_fb.h> 11 12 #include <asm/arch/imx-regs.h> 13 #include <asm/arch/clock.h> 14 #include <asm/arch/sys_proto.h> 15 #include <linux/errno.h> 16 #include <asm/io.h> 17 18 #include <asm/imx-common/dma.h> 19 20 #include "videomodes.h" 21 22 #define PS2KHZ(ps) (1000000000UL / (ps)) 23 24 static GraphicDevice panel; 25 struct mxs_dma_desc desc; 26 27 /** 28 * mxsfb_system_setup() - Fine-tune LCDIF configuration 29 * 30 * This function is used to adjust the LCDIF configuration. This is usually 31 * needed when driving the controller in System-Mode to operate an 8080 or 32 * 6800 connected SmartLCD. 33 */ 34 __weak void mxsfb_system_setup(void) 35 { 36 } 37 38 /* 39 * DENX M28EVK: 40 * setenv videomode 41 * video=ctfb:x:800,y:480,depth:18,mode:0,pclk:30066, 42 * le:0,ri:256,up:0,lo:45,hs:1,vs:1,sync:100663296,vmode:0 43 * 44 * Freescale mx23evk/mx28evk with a Seiko 4.3'' WVGA panel: 45 * setenv videomode 46 * video=ctfb:x:800,y:480,depth:24,mode:0,pclk:29851, 47 * le:89,ri:164,up:23,lo:10,hs:10,vs:10,sync:0,vmode:0 48 */ 49 50 static void mxs_lcd_init(GraphicDevice *panel, 51 struct ctfb_res_modes *mode, int bpp) 52 { 53 struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE; 54 uint32_t word_len = 0, bus_width = 0; 55 uint8_t valid_data = 0; 56 57 /* Kick in the LCDIF clock */ 58 mxs_set_lcdclk(MXS_LCDIF_BASE, PS2KHZ(mode->pixclock)); 59 60 /* Restart the LCDIF block */ 61 mxs_reset_block(®s->hw_lcdif_ctrl_reg); 62 63 switch (bpp) { 64 case 24: 65 word_len = LCDIF_CTRL_WORD_LENGTH_24BIT; 66 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_24BIT; 67 valid_data = 0x7; 68 break; 69 case 18: 70 word_len = LCDIF_CTRL_WORD_LENGTH_24BIT; 71 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_18BIT; 72 valid_data = 0x7; 73 break; 74 case 16: 75 word_len = LCDIF_CTRL_WORD_LENGTH_16BIT; 76 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_16BIT; 77 valid_data = 0xf; 78 break; 79 case 8: 80 word_len = LCDIF_CTRL_WORD_LENGTH_8BIT; 81 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_8BIT; 82 valid_data = 0xf; 83 break; 84 } 85 86 writel(bus_width | word_len | LCDIF_CTRL_DOTCLK_MODE | 87 LCDIF_CTRL_BYPASS_COUNT | LCDIF_CTRL_LCDIF_MASTER, 88 ®s->hw_lcdif_ctrl); 89 90 writel(valid_data << LCDIF_CTRL1_BYTE_PACKING_FORMAT_OFFSET, 91 ®s->hw_lcdif_ctrl1); 92 93 mxsfb_system_setup(); 94 95 writel((mode->yres << LCDIF_TRANSFER_COUNT_V_COUNT_OFFSET) | mode->xres, 96 ®s->hw_lcdif_transfer_count); 97 98 writel(LCDIF_VDCTRL0_ENABLE_PRESENT | LCDIF_VDCTRL0_ENABLE_POL | 99 LCDIF_VDCTRL0_VSYNC_PERIOD_UNIT | 100 LCDIF_VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | 101 mode->vsync_len, ®s->hw_lcdif_vdctrl0); 102 writel(mode->upper_margin + mode->lower_margin + 103 mode->vsync_len + mode->yres, 104 ®s->hw_lcdif_vdctrl1); 105 writel((mode->hsync_len << LCDIF_VDCTRL2_HSYNC_PULSE_WIDTH_OFFSET) | 106 (mode->left_margin + mode->right_margin + 107 mode->hsync_len + mode->xres), 108 ®s->hw_lcdif_vdctrl2); 109 writel(((mode->left_margin + mode->hsync_len) << 110 LCDIF_VDCTRL3_HORIZONTAL_WAIT_CNT_OFFSET) | 111 (mode->upper_margin + mode->vsync_len), 112 ®s->hw_lcdif_vdctrl3); 113 writel((0 << LCDIF_VDCTRL4_DOTCLK_DLY_SEL_OFFSET) | mode->xres, 114 ®s->hw_lcdif_vdctrl4); 115 116 writel(panel->frameAdrs, ®s->hw_lcdif_cur_buf); 117 writel(panel->frameAdrs, ®s->hw_lcdif_next_buf); 118 119 /* Flush FIFO first */ 120 writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_set); 121 122 #ifndef CONFIG_VIDEO_MXS_MODE_SYSTEM 123 /* Sync signals ON */ 124 setbits_le32(®s->hw_lcdif_vdctrl4, LCDIF_VDCTRL4_SYNC_SIGNALS_ON); 125 #endif 126 127 /* FIFO cleared */ 128 writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_clr); 129 130 /* RUN! */ 131 writel(LCDIF_CTRL_RUN, ®s->hw_lcdif_ctrl_set); 132 } 133 134 void lcdif_power_down(void) 135 { 136 struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE; 137 int timeout = 1000000; 138 139 if (!panel.frameAdrs) 140 return; 141 142 writel(panel.frameAdrs, ®s->hw_lcdif_cur_buf_reg); 143 writel(panel.frameAdrs, ®s->hw_lcdif_next_buf_reg); 144 writel(LCDIF_CTRL1_VSYNC_EDGE_IRQ, ®s->hw_lcdif_ctrl1_clr); 145 while (--timeout) { 146 if (readl(®s->hw_lcdif_ctrl1_reg) & 147 LCDIF_CTRL1_VSYNC_EDGE_IRQ) 148 break; 149 udelay(1); 150 } 151 mxs_reset_block((struct mxs_register_32 *)®s->hw_lcdif_ctrl_reg); 152 } 153 154 void *video_hw_init(void) 155 { 156 int bpp = -1; 157 char *penv; 158 void *fb; 159 struct ctfb_res_modes mode; 160 161 puts("Video: "); 162 163 /* Suck display configuration from "videomode" variable */ 164 penv = getenv("videomode"); 165 if (!penv) { 166 puts("MXSFB: 'videomode' variable not set!\n"); 167 return NULL; 168 } 169 170 bpp = video_get_params(&mode, penv); 171 172 /* fill in Graphic device struct */ 173 sprintf(panel.modeIdent, "%dx%dx%d", 174 mode.xres, mode.yres, bpp); 175 176 panel.winSizeX = mode.xres; 177 panel.winSizeY = mode.yres; 178 panel.plnSizeX = mode.xres; 179 panel.plnSizeY = mode.yres; 180 181 switch (bpp) { 182 case 24: 183 case 18: 184 panel.gdfBytesPP = 4; 185 panel.gdfIndex = GDF_32BIT_X888RGB; 186 break; 187 case 16: 188 panel.gdfBytesPP = 2; 189 panel.gdfIndex = GDF_16BIT_565RGB; 190 break; 191 case 8: 192 panel.gdfBytesPP = 1; 193 panel.gdfIndex = GDF__8BIT_INDEX; 194 break; 195 default: 196 printf("MXSFB: Invalid BPP specified! (bpp = %i)\n", bpp); 197 return NULL; 198 } 199 200 panel.memSize = mode.xres * mode.yres * panel.gdfBytesPP; 201 202 /* Allocate framebuffer */ 203 fb = memalign(ARCH_DMA_MINALIGN, 204 roundup(panel.memSize, ARCH_DMA_MINALIGN)); 205 if (!fb) { 206 printf("MXSFB: Error allocating framebuffer!\n"); 207 return NULL; 208 } 209 210 /* Wipe framebuffer */ 211 memset(fb, 0, panel.memSize); 212 213 panel.frameAdrs = (u32)fb; 214 215 printf("%s\n", panel.modeIdent); 216 217 /* Start framebuffer */ 218 mxs_lcd_init(&panel, &mode, bpp); 219 220 #ifdef CONFIG_VIDEO_MXS_MODE_SYSTEM 221 /* 222 * If the LCD runs in system mode, the LCD refresh has to be triggered 223 * manually by setting the RUN bit in HW_LCDIF_CTRL register. To avoid 224 * having to set this bit manually after every single change in the 225 * framebuffer memory, we set up specially crafted circular DMA, which 226 * sets the RUN bit, then waits until it gets cleared and repeats this 227 * infinitelly. This way, we get smooth continuous updates of the LCD. 228 */ 229 struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE; 230 231 memset(&desc, 0, sizeof(struct mxs_dma_desc)); 232 desc.address = (dma_addr_t)&desc; 233 desc.cmd.data = MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN | 234 MXS_DMA_DESC_WAIT4END | 235 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET); 236 desc.cmd.pio_words[0] = readl(®s->hw_lcdif_ctrl) | LCDIF_CTRL_RUN; 237 desc.cmd.next = (uint32_t)&desc.cmd; 238 239 /* Execute the DMA chain. */ 240 mxs_dma_circ_start(MXS_DMA_CHANNEL_AHB_APBH_LCDIF, &desc); 241 #endif 242 243 return (void *)&panel; 244 } 245