1 /* 2 * (C) Copyright 2012 Stephen Warren 3 * 4 * See file CREDITS for list of people who contributed to this 5 * project. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <common.h> 19 #include <lcd.h> 20 #include <asm/arch/mbox.h> 21 #include <asm/global_data.h> 22 23 DECLARE_GLOBAL_DATA_PTR; 24 25 /* Global variables that lcd.c expects to exist */ 26 int lcd_line_length; 27 int lcd_color_fg; 28 int lcd_color_bg; 29 void *lcd_base; 30 void *lcd_console_address; 31 short console_col; 32 short console_row; 33 vidinfo_t panel_info; 34 char lcd_cursor_enabled; 35 ushort lcd_cursor_width; 36 ushort lcd_cursor_height; 37 38 struct msg_query { 39 struct bcm2835_mbox_hdr hdr; 40 struct bcm2835_mbox_tag_physical_w_h physical_w_h; 41 u32 end_tag; 42 }; 43 44 struct msg_setup { 45 struct bcm2835_mbox_hdr hdr; 46 struct bcm2835_mbox_tag_physical_w_h physical_w_h; 47 struct bcm2835_mbox_tag_virtual_w_h virtual_w_h; 48 struct bcm2835_mbox_tag_depth depth; 49 struct bcm2835_mbox_tag_pixel_order pixel_order; 50 struct bcm2835_mbox_tag_alpha_mode alpha_mode; 51 struct bcm2835_mbox_tag_virtual_offset virtual_offset; 52 struct bcm2835_mbox_tag_overscan overscan; 53 struct bcm2835_mbox_tag_allocate_buffer allocate_buffer; 54 u32 end_tag; 55 }; 56 57 void lcd_ctrl_init(void *lcdbase) 58 { 59 ALLOC_ALIGN_BUFFER(struct msg_query, msg_query, 1, 16); 60 ALLOC_ALIGN_BUFFER(struct msg_setup, msg_setup, 1, 16); 61 int ret; 62 u32 w, h; 63 64 debug("bcm2835: Query resolution...\n"); 65 66 BCM2835_MBOX_INIT_HDR(msg_query); 67 BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h, 68 GET_PHYSICAL_W_H); 69 ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr); 70 if (ret) { 71 printf("bcm2835: Could not query display resolution\n"); 72 /* FIXME: How to disable the LCD to prevent errors? hang()? */ 73 return; 74 } 75 76 w = msg_query->physical_w_h.body.resp.width; 77 h = msg_query->physical_w_h.body.resp.height; 78 79 debug("bcm2835: Setting up display for %d x %d\n", w, h); 80 81 BCM2835_MBOX_INIT_HDR(msg_setup); 82 BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H); 83 msg_setup->physical_w_h.body.req.width = w; 84 msg_setup->physical_w_h.body.req.height = h; 85 BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H); 86 msg_setup->virtual_w_h.body.req.width = w; 87 msg_setup->virtual_w_h.body.req.height = h; 88 BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH); 89 msg_setup->depth.body.req.bpp = 16; 90 BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER); 91 msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR; 92 BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE); 93 msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED; 94 BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET); 95 msg_setup->virtual_offset.body.req.x = 0; 96 msg_setup->virtual_offset.body.req.y = 0; 97 BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN); 98 msg_setup->overscan.body.req.top = 0; 99 msg_setup->overscan.body.req.bottom = 0; 100 msg_setup->overscan.body.req.left = 0; 101 msg_setup->overscan.body.req.right = 0; 102 BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER); 103 msg_setup->allocate_buffer.body.req.alignment = 0x100; 104 105 ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr); 106 if (ret) { 107 printf("bcm2835: Could not configure display\n"); 108 /* FIXME: How to disable the LCD to prevent errors? hang()? */ 109 return; 110 } 111 112 w = msg_setup->physical_w_h.body.resp.width; 113 h = msg_setup->physical_w_h.body.resp.height; 114 115 debug("bcm2835: Final resolution is %d x %d\n", w, h); 116 117 panel_info.vl_col = w; 118 panel_info.vl_row = h; 119 panel_info.vl_bpix = LCD_COLOR16; 120 121 gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address; 122 lcd_base = (void *)gd->fb_base; 123 } 124 125 void lcd_enable(void) 126 { 127 } 128