diff options
Diffstat (limited to 'src/roms/u-boot/drivers/video/mxsfb.c')
| -rw-r--r-- | src/roms/u-boot/drivers/video/mxsfb.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/roms/u-boot/drivers/video/mxsfb.c b/src/roms/u-boot/drivers/video/mxsfb.c new file mode 100644 index 0000000..03b0f88 --- /dev/null +++ b/src/roms/u-boot/drivers/video/mxsfb.c @@ -0,0 +1,224 @@ +/* + * 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 <asm/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(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 *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; +} |
