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 static u32 bcm2835_pitch;
  18
  19 struct msg_query {
  20         struct bcm2835_mbox_hdr hdr;
  21         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  22         u32 end_tag;
  23 };
  24
  25 struct msg_setup {
  26         struct bcm2835_mbox_hdr hdr;
  27         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  28         struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
  29         struct bcm2835_mbox_tag_depth depth;
  30         struct bcm2835_mbox_tag_pixel_order pixel_order;
  31         struct bcm2835_mbox_tag_alpha_mode alpha_mode;
  32         struct bcm2835_mbox_tag_virtual_offset virtual_offset;
  33         struct bcm2835_mbox_tag_overscan overscan;
  34         struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
  35         struct bcm2835_mbox_tag_pitch pitch;
  36         u32 end_tag;
  37 };
  38
  39 void lcd_ctrl_init(void *lcdbase)
  40 {
  41         ALLOC_CACHE_ALIGN_BUFFER(struct msg_query, msg_query, 1);
  42         ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1);
  43         int ret;
  44         u32 w, h;
  45
  46         debug("bcm2835: Query resolution...\n");
  47
  48         BCM2835_MBOX_INIT_HDR(msg_query);
  49         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
  50                                         GET_PHYSICAL_W_H);
  51         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
  52         if (ret) {
  53                 printf("bcm2835: Could not query display resolution\n");
  54                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  55                 return;
  56         }
  57
  58         w = msg_query->physical_w_h.body.resp.width;
  59         h = msg_query->physical_w_h.body.resp.height;
  60
  61         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  62
  63         BCM2835_MBOX_INIT_HDR(msg_setup);
  64         BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
  65         msg_setup->physical_w_h.body.req.width = w;
  66         msg_setup->physical_w_h.body.req.height = h;
  67         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
  68         msg_setup->virtual_w_h.body.req.width = w;
  69         msg_setup->virtual_w_h.body.req.height = h;
  70         BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
  71         msg_setup->depth.body.req.bpp = 16;
  72         BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
  73         msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
  74         BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
  75         msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
  76         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
  77         msg_setup->virtual_offset.body.req.x = 0;
  78         msg_setup->virtual_offset.body.req.y = 0;
  79         BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
  80         msg_setup->overscan.body.req.top = 0;
  81         msg_setup->overscan.body.req.bottom = 0;
  82         msg_setup->overscan.body.req.left = 0;
  83         msg_setup->overscan.body.req.right = 0;
  84         BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
  85         msg_setup->allocate_buffer.body.req.alignment = 0x100;
  86         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
  87
  88         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
  89         if (ret) {
  90                 printf("bcm2835: Could not configure display\n");
  91                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  92                 return;
  93         }
  94
  95         w = msg_setup->physical_w_h.body.resp.width;
  96         h = msg_setup->physical_w_h.body.resp.height;
  97         bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
  98
  99         debug("bcm2835: Final resolution is %d x %d\n", w, h);
 100
 101         panel_info.vl_col = w;
 102         panel_info.vl_row = h;
 103         panel_info.vl_bpix = LCD_COLOR16;
 104
 105         gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address;
 106 }
 107
 108 void lcd_enable(void)
 109 {
 110 }
 111
 112 int lcd_get_size(int *line_length)
 113 {
 114         *line_length = bcm2835_pitch;
 115         return *line_length * panel_info.vl_row;
 116 }