drivers/video/bcm2835.c

   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 }