drivers/video/bcm2835.c

   1 /*
   2  * (C) Copyright 2012 Stephen Warren
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <lcd.h>
   9 #include <asm/arch/mbox.h>
  10 #include <asm/global_data.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 /* Global variables that lcd.c expects to exist */
  15 vidinfo_t panel_info;
  16
  17 struct msg_query {
  18         struct bcm2835_mbox_hdr hdr;
  19         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  20         u32 end_tag;
  21 };
  22
  23 struct msg_setup {
  24         struct bcm2835_mbox_hdr hdr;
  25         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  26         struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
  27         struct bcm2835_mbox_tag_depth depth;
  28         struct bcm2835_mbox_tag_pixel_order pixel_order;
  29         struct bcm2835_mbox_tag_alpha_mode alpha_mode;
  30         struct bcm2835_mbox_tag_virtual_offset virtual_offset;
  31         struct bcm2835_mbox_tag_overscan overscan;
  32         struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
  33         u32 end_tag;
  34 };
  35
  36 void lcd_ctrl_init(void *lcdbase)
  37 {
  38         ALLOC_ALIGN_BUFFER(struct msg_query, msg_query, 1, 16);
  39         ALLOC_ALIGN_BUFFER(struct msg_setup, msg_setup, 1, 16);
  40         int ret;
  41         u32 w, h;
  42
  43         debug("bcm2835: Query resolution...\n");
  44
  45         BCM2835_MBOX_INIT_HDR(msg_query);
  46         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
  47                                         GET_PHYSICAL_W_H);
  48         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
  49         if (ret) {
  50                 printf("bcm2835: Could not query display resolution\n");
  51                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  52                 return;
  53         }
  54
  55         w = msg_query->physical_w_h.body.resp.width;
  56         h = msg_query->physical_w_h.body.resp.height;
  57
  58         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  59
  60         BCM2835_MBOX_INIT_HDR(msg_setup);
  61         BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
  62         msg_setup->physical_w_h.body.req.width = w;
  63         msg_setup->physical_w_h.body.req.height = h;
  64         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
  65         msg_setup->virtual_w_h.body.req.width = w;
  66         msg_setup->virtual_w_h.body.req.height = h;
  67         BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
  68         msg_setup->depth.body.req.bpp = 16;
  69         BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
  70         msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
  71         BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
  72         msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
  73         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
  74         msg_setup->virtual_offset.body.req.x = 0;
  75         msg_setup->virtual_offset.body.req.y = 0;
  76         BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
  77         msg_setup->overscan.body.req.top = 0;
  78         msg_setup->overscan.body.req.bottom = 0;
  79         msg_setup->overscan.body.req.left = 0;
  80         msg_setup->overscan.body.req.right = 0;
  81         BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
  82         msg_setup->allocate_buffer.body.req.alignment = 0x100;
  83
  84         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
  85         if (ret) {
  86                 printf("bcm2835: Could not configure display\n");
  87                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  88                 return;
  89         }
  90
  91         w = msg_setup->physical_w_h.body.resp.width;
  92         h = msg_setup->physical_w_h.body.resp.height;
  93
  94         debug("bcm2835: Final resolution is %d x %d\n", w, h);
  95
  96         panel_info.vl_col = w;
  97         panel_info.vl_row = h;
  98         panel_info.vl_bpix = LCD_COLOR16;
  99
 100         gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address;
 101 }
 102
 103 void lcd_enable(void)
 104 {
 105 }