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 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 }