| Thomas Diener | d1dacf7 | 2014-04-23 07:52:43 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2011 |
| 3 | * Matthias Weisser <weisserm@arcor.de> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | * |
| 7 | * imx25lcdc.c - Graphic interface for i.MX25 lcd controller |
| 8 | */ |
| 9 | |
| 10 | #include <common.h> |
| 11 | |
| 12 | #include <malloc.h> |
| 13 | #include <asm/io.h> |
| 14 | #include <asm/arch/imx-regs.h> |
| 15 | #include <video_fb.h> |
| 16 | #include "videomodes.h" |
| 17 | |
| 18 | /* |
| 19 | * 4MB (at the end of system RAM) |
| 20 | */ |
| 21 | #define VIDEO_MEM_SIZE 0x400000 |
| 22 | |
| 23 | #define FB_SYNC_CLK_INV (1<<16) /* pixel clock inverted */ |
| 24 | |
| 25 | /* |
| 26 | * Graphic Device |
| 27 | */ |
| 28 | static GraphicDevice imx25fb; |
| 29 | |
| 30 | void *video_hw_init(void) |
| 31 | { |
| 32 | struct lcdc_regs *lcdc = (struct lcdc_regs *)IMX_LCDC_BASE; |
| 33 | struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE; |
| 34 | GraphicDevice *pGD = &imx25fb; |
| 35 | char *s; |
| 36 | u32 *videomem; |
| 37 | |
| 38 | memset(pGD, 0, sizeof(GraphicDevice)); |
| 39 | |
| 40 | pGD->gdfIndex = GDF_16BIT_565RGB; |
| 41 | pGD->gdfBytesPP = 2; |
| 42 | pGD->memSize = VIDEO_MEM_SIZE; |
| 43 | pGD->frameAdrs = PHYS_SDRAM + PHYS_SDRAM_SIZE - VIDEO_MEM_SIZE; |
| 44 | |
| 45 | videomem = (u32 *)pGD->frameAdrs; |
| 46 | |
| 47 | s = getenv("videomode"); |
| 48 | if (s != NULL) { |
| 49 | struct ctfb_res_modes var_mode; |
| 50 | u32 lsr, lpcr, lhcr, lvcr; |
| 51 | unsigned long div; |
| 52 | int bpp; |
| 53 | |
| 54 | /* Disable all clocks of the LCDC */ |
| 55 | writel(readl(&ccm->cgr0) & ~((1<<7) | (1<<24)), &ccm->cgr0); |
| 56 | writel(readl(&ccm->cgr1) & ~(1<<29), &ccm->cgr1); |
| 57 | |
| 58 | bpp = video_get_params(&var_mode, s); |
| 59 | |
| 60 | if (bpp == 0) { |
| 61 | var_mode.xres = 320; |
| 62 | var_mode.yres = 240; |
| 63 | var_mode.pixclock = 154000; |
| 64 | var_mode.left_margin = 68; |
| 65 | var_mode.right_margin = 20; |
| 66 | var_mode.upper_margin = 4; |
| 67 | var_mode.lower_margin = 18; |
| 68 | var_mode.hsync_len = 40; |
| 69 | var_mode.vsync_len = 6; |
| 70 | var_mode.sync = 0; |
| 71 | var_mode.vmode = 0; |
| 72 | } |
| 73 | |
| 74 | /* Fill memory with white */ |
| 75 | memset(videomem, 0xFF, var_mode.xres * var_mode.yres * 2); |
| 76 | |
| 77 | imx25fb.winSizeX = var_mode.xres; |
| 78 | imx25fb.winSizeY = var_mode.yres; |
| 79 | |
| 80 | /* LCD base clock is 66.6MHZ. We do calculations in kHz */ |
| 81 | div = 66000 / (1000000000L / var_mode.pixclock); |
| 82 | if (div > 63) |
| 83 | div = 63; |
| 84 | if (0 == div) |
| 85 | div = 1; |
| 86 | |
| 87 | lsr = ((var_mode.xres / 16) << 20) | |
| 88 | var_mode.yres; |
| 89 | lpcr = (1 << 31) | |
| 90 | (1 << 30) | |
| 91 | (5 << 25) | |
| 92 | (1 << 23) | |
| 93 | (1 << 22) | |
| 94 | (1 << 19) | |
| 95 | (1 << 7) | |
| 96 | div; |
| 97 | lhcr = (var_mode.right_margin << 0) | |
| 98 | (var_mode.left_margin << 8) | |
| 99 | (var_mode.hsync_len << 26); |
| 100 | |
| 101 | lvcr = (var_mode.lower_margin << 0) | |
| 102 | (var_mode.upper_margin << 8) | |
| 103 | (var_mode.vsync_len << 26); |
| 104 | |
| 105 | writel((uint32_t)videomem, &lcdc->lssar); |
| 106 | writel(lsr, &lcdc->lsr); |
| 107 | writel(var_mode.xres * 2 / 4, &lcdc->lvpwr); |
| 108 | writel(lpcr, &lcdc->lpcr); |
| 109 | writel(lhcr, &lcdc->lhcr); |
| 110 | writel(lvcr, &lcdc->lvcr); |
| 111 | writel(0x00040060, &lcdc->ldcr); |
| 112 | |
| 113 | writel(0xA90300, &lcdc->lpccr); |
| 114 | |
| 115 | /* Ensable all clocks of the LCDC */ |
| 116 | writel(readl(&ccm->cgr0) | ((1<<7) | (1<<24)), &ccm->cgr0); |
| 117 | writel(readl(&ccm->cgr1) | (1<<29), &ccm->cgr1); |
| 118 | } |
| 119 | |
| 120 | return pGD; |
| 121 | } |