/* * Freescale i.MX23/i.MX28 LCDIF driver * * Copyright (C) 2011-2013 Marek Vasut <marex@denx.de> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <malloc.h> #include <video_fb.h> #include <asm/arch/imx-regs.h> #include <asm/arch/clock.h> #include <asm/arch/sys_proto.h> #include <linux/errno.h> #include <asm/io.h> #include <asm/imx-common/dma.h> #include "videomodes.h" #define PS2KHZ(ps) (1000000000UL / (ps)) static GraphicDevice panel; struct mxs_dma_desc desc; /** * mxsfb_system_setup() - Fine-tune LCDIF configuration * * This function is used to adjust the LCDIF configuration. This is usually * needed when driving the controller in System-Mode to operate an 8080 or * 6800 connected SmartLCD. */ __weak void mxsfb_system_setup(void) { } /* * DENX M28EVK: * setenv videomode * video=ctfb:x:800,y:480,depth:18,mode:0,pclk:30066, * le:0,ri:256,up:0,lo:45,hs:1,vs:1,sync:100663296,vmode:0 * * Freescale mx23evk/mx28evk with a Seiko 4.3'' WVGA panel: * setenv videomode * video=ctfb:x:800,y:480,depth:24,mode:0,pclk:29851, * le:89,ri:164,up:23,lo:10,hs:10,vs:10,sync:0,vmode:0 */ static void mxs_lcd_init(GraphicDevice *panel, struct ctfb_res_modes *mode, int bpp) { struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE; uint32_t word_len = 0, bus_width = 0; uint8_t valid_data = 0; /* Kick in the LCDIF clock */ mxs_set_lcdclk(MXS_LCDIF_BASE, PS2KHZ(mode->pixclock)); /* Restart the LCDIF block */ mxs_reset_block(®s->hw_lcdif_ctrl_reg); switch (bpp) { case 24: word_len = LCDIF_CTRL_WORD_LENGTH_24BIT; bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_24BIT; valid_data = 0x7; break; case 18: word_len = LCDIF_CTRL_WORD_LENGTH_24BIT; bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_18BIT; valid_data = 0x7; break; case 16: word_len = LCDIF_CTRL_WORD_LENGTH_16BIT; bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_16BIT; valid_data = 0xf; break; case 8: word_len = LCDIF_CTRL_WORD_LENGTH_8BIT; bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_8BIT; valid_data = 0xf; break; } writel(bus_width | word_len | LCDIF_CTRL_DOTCLK_MODE | LCDIF_CTRL_BYPASS_COUNT | LCDIF_CTRL_LCDIF_MASTER, ®s->hw_lcdif_ctrl); writel(valid_data << LCDIF_CTRL1_BYTE_PACKING_FORMAT_OFFSET, ®s->hw_lcdif_ctrl1); mxsfb_system_setup(); writel((mode->yres << LCDIF_TRANSFER_COUNT_V_COUNT_OFFSET) | mode->xres, ®s->hw_lcdif_transfer_count); writel(LCDIF_VDCTRL0_ENABLE_PRESENT | LCDIF_VDCTRL0_ENABLE_POL | LCDIF_VDCTRL0_VSYNC_PERIOD_UNIT | LCDIF_VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | mode->vsync_len, ®s->hw_lcdif_vdctrl0); writel(mode->upper_margin + mode->lower_margin + mode->vsync_len + mode->yres, ®s->hw_lcdif_vdctrl1); writel((mode->hsync_len << LCDIF_VDCTRL2_HSYNC_PULSE_WIDTH_OFFSET) | (mode->left_margin + mode->right_margin + mode->hsync_len + mode->xres), ®s->hw_lcdif_vdctrl2); writel(((mode->left_margin + mode->hsync_len) << LCDIF_VDCTRL3_HORIZONTAL_WAIT_CNT_OFFSET) | (mode->upper_margin + mode->vsync_len), ®s->hw_lcdif_vdctrl3); writel((0 << LCDIF_VDCTRL4_DOTCLK_DLY_SEL_OFFSET) | mode->xres, ®s->hw_lcdif_vdctrl4); writel(panel->frameAdrs, ®s->hw_lcdif_cur_buf); writel(panel->frameAdrs, ®s->hw_lcdif_next_buf); /* Flush FIFO first */ writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_set); #ifndef CONFIG_VIDEO_MXS_MODE_SYSTEM /* Sync signals ON */ setbits_le32(®s->hw_lcdif_vdctrl4, LCDIF_VDCTRL4_SYNC_SIGNALS_ON); #endif /* FIFO cleared */ writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_clr); /* RUN! */ writel(LCDIF_CTRL_RUN, ®s->hw_lcdif_ctrl_set); } void lcdif_power_down(void) { struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE; int timeout = 1000000; writel(panel.frameAdrs, ®s->hw_lcdif_cur_buf_reg); writel(panel.frameAdrs, ®s->hw_lcdif_next_buf_reg); writel(LCDIF_CTRL1_VSYNC_EDGE_IRQ, ®s->hw_lcdif_ctrl1_clr); while (--timeout) { if (readl(®s->hw_lcdif_ctrl1_reg) & LCDIF_CTRL1_VSYNC_EDGE_IRQ) break; udelay(1); } mxs_reset_block((struct mxs_register_32 *)®s->hw_lcdif_ctrl_reg); } void *video_hw_init(void) { int bpp = -1; char *penv; void *fb; struct ctfb_res_modes mode; puts("Video: "); /* Suck display configuration from "videomode" variable */ penv = getenv("videomode"); if (!penv) { puts("MXSFB: 'videomode' variable not set!\n"); return NULL; } bpp = video_get_params(&mode, penv); /* fill in Graphic device struct */ sprintf(panel.modeIdent, "%dx%dx%d", mode.xres, mode.yres, bpp); panel.winSizeX = mode.xres; panel.winSizeY = mode.yres; panel.plnSizeX = mode.xres; panel.plnSizeY = mode.yres; switch (bpp) { case 24: case 18: panel.gdfBytesPP = 4; panel.gdfIndex = GDF_32BIT_X888RGB; break; case 16: panel.gdfBytesPP = 2; panel.gdfIndex = GDF_16BIT_565RGB; break; case 8: panel.gdfBytesPP = 1; panel.gdfIndex = GDF__8BIT_INDEX; break; default: printf("MXSFB: Invalid BPP specified! (bpp = %i)\n", bpp); return NULL; } panel.memSize = mode.xres * mode.yres * panel.gdfBytesPP; /* Allocate framebuffer */ fb = memalign(ARCH_DMA_MINALIGN, roundup(panel.memSize, ARCH_DMA_MINALIGN)); if (!fb) { printf("MXSFB: Error allocating framebuffer!\n"); return NULL; } /* Wipe framebuffer */ memset(fb, 0, panel.memSize); panel.frameAdrs = (u32)fb; printf("%s\n", panel.modeIdent); /* Start framebuffer */ mxs_lcd_init(&panel, &mode, bpp); #ifdef CONFIG_VIDEO_MXS_MODE_SYSTEM /* * If the LCD runs in system mode, the LCD refresh has to be triggered * manually by setting the RUN bit in HW_LCDIF_CTRL register. To avoid * having to set this bit manually after every single change in the * framebuffer memory, we set up specially crafted circular DMA, which * sets the RUN bit, then waits until it gets cleared and repeats this * infinitelly. This way, we get smooth continuous updates of the LCD. */ struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE; memset(&desc, 0, sizeof(struct mxs_dma_desc)); desc.address = (dma_addr_t)&desc; desc.cmd.data = MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN | MXS_DMA_DESC_WAIT4END | (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET); desc.cmd.pio_words[0] = readl(®s->hw_lcdif_ctrl) | LCDIF_CTRL_RUN; desc.cmd.next = (uint32_t)&desc.cmd; /* Execute the DMA chain. */ mxs_dma_circ_start(MXS_DMA_CHANNEL_AHB_APBH_LCDIF, &desc); #endif return (void *)&panel; }