--- /dev/null
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff