1 // SPDX-License-Identifier: GPL-2.0+
3 * Freescale i.MX23/i.MX28 LCDIF driver
5 * Copyright (C) 2011-2013 Marek Vasut <marex@denx.de>
12 #include <asm/cache.h>
13 #include <dm/device_compat.h>
14 #include <linux/delay.h>
15 #include <linux/errno.h>
20 #include <asm/arch/clock.h>
21 #include <asm/arch/imx-regs.h>
22 #include <asm/arch/sys_proto.h>
23 #include <asm/global_data.h>
24 #include <asm/mach-imx/dma.h>
27 #include "videomodes.h"
29 #define PS2KHZ(ps) (1000000000UL / (ps))
30 #define HZ2PS(hz) (1000000000UL / ((hz) / 1000))
35 struct mxs_dma_desc desc;
38 * mxsfb_system_setup() - Fine-tune LCDIF configuration
40 * This function is used to adjust the LCDIF configuration. This is usually
41 * needed when driving the controller in System-Mode to operate an 8080 or
42 * 6800 connected SmartLCD.
44 __weak void mxsfb_system_setup(void)
51 * video=ctfb:x:800,y:480,depth:18,mode:0,pclk:30066,
52 * le:0,ri:256,up:0,lo:45,hs:1,vs:1,sync:100663296,vmode:0
54 * Freescale mx23evk/mx28evk with a Seiko 4.3'' WVGA panel:
56 * video=ctfb:x:800,y:480,depth:24,mode:0,pclk:29851,
57 * le:89,ri:164,up:23,lo:10,hs:10,vs:10,sync:0,vmode:0
60 static void mxs_lcd_init(struct udevice *dev, u32 fb_addr,
61 struct display_timing *timings, int bpp)
63 struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
64 const enum display_flags flags = timings->flags;
65 uint32_t word_len = 0, bus_width = 0;
66 uint8_t valid_data = 0;
69 #if CONFIG_IS_ENABLED(CLK)
73 ret = clk_get_by_name(dev, "pix", &clk);
75 dev_err(dev, "Failed to get mxs pix clk: %d\n", ret);
79 ret = clk_set_rate(&clk, timings->pixelclock.typ);
81 dev_err(dev, "Failed to set mxs pix clk: %d\n", ret);
85 ret = clk_enable(&clk);
87 dev_err(dev, "Failed to enable mxs pix clk: %d\n", ret);
91 ret = clk_get_by_name(dev, "axi", &clk);
93 debug("%s: Failed to get mxs axi clk: %d\n", __func__, ret);
95 ret = clk_enable(&clk);
97 dev_err(dev, "Failed to enable mxs axi clk: %d\n", ret);
102 ret = clk_get_by_name(dev, "disp_axi", &clk);
104 debug("%s: Failed to get mxs disp_axi clk: %d\n", __func__, ret);
106 ret = clk_enable(&clk);
108 dev_err(dev, "Failed to enable mxs disp_axi clk: %d\n", ret);
113 /* Kick in the LCDIF clock */
114 mxs_set_lcdclk(MXS_LCDIF_BASE, timings->pixelclock.typ / 1000);
117 /* Restart the LCDIF block */
118 mxs_reset_block(®s->hw_lcdif_ctrl_reg);
122 word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
123 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_24BIT;
127 word_len = LCDIF_CTRL_WORD_LENGTH_24BIT;
128 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_18BIT;
132 word_len = LCDIF_CTRL_WORD_LENGTH_16BIT;
133 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_16BIT;
137 word_len = LCDIF_CTRL_WORD_LENGTH_8BIT;
138 bus_width = LCDIF_CTRL_LCD_DATABUS_WIDTH_8BIT;
143 writel(bus_width | word_len | LCDIF_CTRL_DOTCLK_MODE |
144 LCDIF_CTRL_BYPASS_COUNT | LCDIF_CTRL_LCDIF_MASTER,
145 ®s->hw_lcdif_ctrl);
147 writel(valid_data << LCDIF_CTRL1_BYTE_PACKING_FORMAT_OFFSET,
148 ®s->hw_lcdif_ctrl1);
150 mxsfb_system_setup();
152 writel((timings->vactive.typ << LCDIF_TRANSFER_COUNT_V_COUNT_OFFSET) |
153 timings->hactive.typ, ®s->hw_lcdif_transfer_count);
155 vdctrl0 = LCDIF_VDCTRL0_ENABLE_PRESENT | LCDIF_VDCTRL0_ENABLE_POL |
156 LCDIF_VDCTRL0_VSYNC_PERIOD_UNIT |
157 LCDIF_VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
158 timings->vsync_len.typ;
160 if(flags & DISPLAY_FLAGS_HSYNC_HIGH)
161 vdctrl0 |= LCDIF_VDCTRL0_HSYNC_POL;
162 if(flags & DISPLAY_FLAGS_VSYNC_HIGH)
163 vdctrl0 |= LCDIF_VDCTRL0_VSYNC_POL;
164 if(flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
165 vdctrl0 |= LCDIF_VDCTRL0_DOTCLK_POL;
166 if(flags & DISPLAY_FLAGS_DE_HIGH)
167 vdctrl0 |= LCDIF_VDCTRL0_ENABLE_POL;
169 writel(vdctrl0, ®s->hw_lcdif_vdctrl0);
170 writel(timings->vback_porch.typ + timings->vfront_porch.typ +
171 timings->vsync_len.typ + timings->vactive.typ,
172 ®s->hw_lcdif_vdctrl1);
173 writel((timings->hsync_len.typ << LCDIF_VDCTRL2_HSYNC_PULSE_WIDTH_OFFSET) |
174 (timings->hback_porch.typ + timings->hfront_porch.typ +
175 timings->hsync_len.typ + timings->hactive.typ),
176 ®s->hw_lcdif_vdctrl2);
177 writel(((timings->hback_porch.typ + timings->hsync_len.typ) <<
178 LCDIF_VDCTRL3_HORIZONTAL_WAIT_CNT_OFFSET) |
179 (timings->vback_porch.typ + timings->vsync_len.typ),
180 ®s->hw_lcdif_vdctrl3);
181 writel((0 << LCDIF_VDCTRL4_DOTCLK_DLY_SEL_OFFSET) | timings->hactive.typ,
182 ®s->hw_lcdif_vdctrl4);
184 writel(fb_addr, ®s->hw_lcdif_cur_buf);
185 writel(fb_addr, ®s->hw_lcdif_next_buf);
187 /* Flush FIFO first */
188 writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_set);
190 #ifndef CONFIG_VIDEO_MXS_MODE_SYSTEM
191 /* Sync signals ON */
192 setbits_le32(®s->hw_lcdif_vdctrl4, LCDIF_VDCTRL4_SYNC_SIGNALS_ON);
196 writel(LCDIF_CTRL1_FIFO_CLEAR, ®s->hw_lcdif_ctrl1_clr);
199 writel(LCDIF_CTRL_RUN, ®s->hw_lcdif_ctrl_set);
202 static int mxs_probe_common(struct udevice *dev, struct display_timing *timings,
205 /* Start framebuffer */
206 mxs_lcd_init(dev, fb, timings, bpp);
208 #ifdef CONFIG_VIDEO_MXS_MODE_SYSTEM
210 * If the LCD runs in system mode, the LCD refresh has to be triggered
211 * manually by setting the RUN bit in HW_LCDIF_CTRL register. To avoid
212 * having to set this bit manually after every single change in the
213 * framebuffer memory, we set up specially crafted circular DMA, which
214 * sets the RUN bit, then waits until it gets cleared and repeats this
215 * infinitelly. This way, we get smooth continuous updates of the LCD.
217 struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
219 memset(&desc, 0, sizeof(struct mxs_dma_desc));
220 desc.address = (dma_addr_t)&desc;
221 desc.cmd.data = MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_CHAIN |
222 MXS_DMA_DESC_WAIT4END |
223 (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
224 desc.cmd.pio_words[0] = readl(®s->hw_lcdif_ctrl) | LCDIF_CTRL_RUN;
225 desc.cmd.next = (uint32_t)&desc.cmd;
227 /* Execute the DMA chain. */
228 mxs_dma_circ_start(MXS_DMA_CHANNEL_AHB_APBH_LCDIF, &desc);
234 static int mxs_remove_common(u32 fb)
236 struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
237 int timeout = 1000000;
242 writel(fb, ®s->hw_lcdif_cur_buf_reg);
243 writel(fb, ®s->hw_lcdif_next_buf_reg);
244 writel(LCDIF_CTRL1_VSYNC_EDGE_IRQ, ®s->hw_lcdif_ctrl1_clr);
246 if (readl(®s->hw_lcdif_ctrl1_reg) &
247 LCDIF_CTRL1_VSYNC_EDGE_IRQ)
251 mxs_reset_block((struct mxs_register_32 *)®s->hw_lcdif_ctrl_reg);
256 #ifndef CONFIG_DM_VIDEO
258 static GraphicDevice panel;
260 void lcdif_power_down(void)
262 mxs_remove_common(panel.frameAdrs);
265 void *video_hw_init(void)
271 struct ctfb_res_modes mode;
272 struct display_timing timings;
276 /* Suck display configuration from "videomode" variable */
277 penv = env_get("videomode");
279 puts("MXSFB: 'videomode' variable not set!\n");
283 bpp = video_get_params(&mode, penv);
285 /* fill in Graphic device struct */
286 sprintf(panel.modeIdent, "%dx%dx%d", mode.xres, mode.yres, bpp);
288 panel.winSizeX = mode.xres;
289 panel.winSizeY = mode.yres;
290 panel.plnSizeX = mode.xres;
291 panel.plnSizeY = mode.yres;
296 panel.gdfBytesPP = 4;
297 panel.gdfIndex = GDF_32BIT_X888RGB;
300 panel.gdfBytesPP = 2;
301 panel.gdfIndex = GDF_16BIT_565RGB;
304 panel.gdfBytesPP = 1;
305 panel.gdfIndex = GDF__8BIT_INDEX;
308 printf("MXSFB: Invalid BPP specified! (bpp = %i)\n", bpp);
312 panel.memSize = mode.xres * mode.yres * panel.gdfBytesPP;
314 /* Allocate framebuffer */
315 fb = memalign(ARCH_DMA_MINALIGN,
316 roundup(panel.memSize, ARCH_DMA_MINALIGN));
318 printf("MXSFB: Error allocating framebuffer!\n");
322 /* Wipe framebuffer */
323 memset(fb, 0, panel.memSize);
325 panel.frameAdrs = (u32)fb;
327 printf("%s\n", panel.modeIdent);
329 video_ctfb_mode_to_display_timing(&mode, &timings);
331 ret = mxs_probe_common(NULL, &timings, bpp, (u32)fb);
335 return (void *)&panel;
342 #else /* ifndef CONFIG_DM_VIDEO */
344 static int mxs_of_get_timings(struct udevice *dev,
345 struct display_timing *timings,
352 ret = ofnode_read_u32(dev_ofnode(dev), "display", &display_phandle);
354 dev_err(dev, "required display property isn't provided\n");
358 display_node = ofnode_get_by_phandle(display_phandle);
359 if (!ofnode_valid(display_node)) {
360 dev_err(dev, "failed to find display subnode\n");
364 ret = ofnode_read_u32(display_node, "bits-per-pixel", bpp);
367 "required bits-per-pixel property isn't provided\n");
371 ret = ofnode_decode_display_timing(display_node, 0, timings);
373 dev_err(dev, "failed to get any display timings\n");
380 static int mxs_video_probe(struct udevice *dev)
382 struct video_uc_plat *plat = dev_get_uclass_plat(dev);
383 struct video_priv *uc_priv = dev_get_uclass_priv(dev);
385 struct display_timing timings;
387 u32 fb_start, fb_end;
390 debug("%s() plat: base 0x%lx, size 0x%x\n",
391 __func__, plat->base, plat->size);
393 ret = mxs_of_get_timings(dev, &timings, &bpp);
397 ret = mxs_probe_common(dev, &timings, bpp, plat->base);
405 uc_priv->bpix = VIDEO_BPP32;
408 uc_priv->bpix = VIDEO_BPP16;
411 uc_priv->bpix = VIDEO_BPP8;
414 dev_err(dev, "invalid bpp specified (bpp = %i)\n", bpp);
418 uc_priv->xsize = timings.hactive.typ;
419 uc_priv->ysize = timings.vactive.typ;
421 /* Enable dcache for the frame buffer */
422 fb_start = plat->base & ~(MMU_SECTION_SIZE - 1);
423 fb_end = plat->base + plat->size;
424 fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
425 mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
427 video_set_flush_dcache(dev, true);
428 gd->fb_base = plat->base;
433 static int mxs_video_bind(struct udevice *dev)
435 struct video_uc_plat *plat = dev_get_uclass_plat(dev);
436 struct display_timing timings;
441 ret = mxs_of_get_timings(dev, &timings, &bpp);
458 dev_err(dev, "invalid bpp specified (bpp = %i)\n", bpp);
462 plat->size = timings.hactive.typ * timings.vactive.typ * bytes_pp;
467 static int mxs_video_remove(struct udevice *dev)
469 struct video_uc_plat *plat = dev_get_uclass_plat(dev);
471 mxs_remove_common(plat->base);
476 static const struct udevice_id mxs_video_ids[] = {
477 { .compatible = "fsl,imx23-lcdif" },
478 { .compatible = "fsl,imx28-lcdif" },
479 { .compatible = "fsl,imx7ulp-lcdif" },
480 { .compatible = "fsl,imxrt-lcdif" },
484 U_BOOT_DRIVER(mxs_video) = {
487 .of_match = mxs_video_ids,
488 .bind = mxs_video_bind,
489 .probe = mxs_video_probe,
490 .remove = mxs_video_remove,
491 .flags = DM_FLAG_PRE_RELOC | DM_FLAG_OS_PREPARE,
493 #endif /* ifndef CONFIG_DM_VIDEO */