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 vidinfo_t panel_info; 27 28 struct msg_query { 29 struct bcm2835_mbox_hdr hdr; 30 struct bcm2835_mbox_tag_physical_w_h physical_w_h; 31 u32 end_tag; 32 }; 33 34 struct msg_setup { 35 struct bcm2835_mbox_hdr hdr; 36 struct bcm2835_mbox_tag_physical_w_h physical_w_h; 37 struct bcm2835_mbox_tag_virtual_w_h virtual_w_h; 38 struct bcm2835_mbox_tag_depth depth; 39 struct bcm2835_mbox_tag_pixel_order pixel_order; 40 struct bcm2835_mbox_tag_alpha_mode alpha_mode; 41 struct bcm2835_mbox_tag_virtual_offset virtual_offset; 42 struct bcm2835_mbox_tag_overscan overscan; 43 struct bcm2835_mbox_tag_allocate_buffer allocate_buffer; 44 u32 end_tag; 45 }; 46 47 void lcd_ctrl_init(void *lcdbase) 48 { 49 ALLOC_ALIGN_BUFFER(struct msg_query, msg_query, 1, 16); 50 ALLOC_ALIGN_BUFFER(struct msg_setup, msg_setup, 1, 16); 51 int ret; 52 u32 w, h; 53 54 debug("bcm2835: Query resolution...\n"); 55 56 BCM2835_MBOX_INIT_HDR(msg_query); 57 BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h, 58 GET_PHYSICAL_W_H); 59 ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr); 60 if (ret) { 61 printf("bcm2835: Could not query display resolution\n"); 62 /* FIXME: How to disable the LCD to prevent errors? hang()? */ 63 return; 64 } 65 66 w = msg_query->physical_w_h.body.resp.width; 67 h = msg_query->physical_w_h.body.resp.height; 68 69 debug("bcm2835: Setting up display for %d x %d\n", w, h); 70 71 BCM2835_MBOX_INIT_HDR(msg_setup); 72 BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H); 73 msg_setup->physical_w_h.body.req.width = w; 74 msg_setup->physical_w_h.body.req.height = h; 75 BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H); 76 msg_setup->virtual_w_h.body.req.width = w; 77 msg_setup->virtual_w_h.body.req.height = h; 78 BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH); 79 msg_setup->depth.body.req.bpp = 16; 80 BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER); 81 msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR; 82 BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE); 83 msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED; 84 BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET); 85 msg_setup->virtual_offset.body.req.x = 0; 86 msg_setup->virtual_offset.body.req.y = 0; 87 BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN); 88 msg_setup->overscan.body.req.top = 0; 89 msg_setup->overscan.body.req.bottom = 0; 90 msg_setup->overscan.body.req.left = 0; 91 msg_setup->overscan.body.req.right = 0; 92 BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER); 93 msg_setup->allocate_buffer.body.req.alignment = 0x100; 94 95 ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr); 96 if (ret) { 97 printf("bcm2835: Could not configure display\n"); 98 /* FIXME: How to disable the LCD to prevent errors? hang()? */ 99 return; 100 } 101 102 w = msg_setup->physical_w_h.body.resp.width; 103 h = msg_setup->physical_w_h.body.resp.height; 104 105 debug("bcm2835: Final resolution is %d x %d\n", w, h); 106 107 panel_info.vl_col = w; 108 panel_info.vl_row = h; 109 panel_info.vl_bpix = LCD_COLOR16; 110 111 gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address; 112 } 113 114 void lcd_enable(void) 115 { 116 } 117