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 <memalign.h>
  10 #include <asm/arch/mbox.h>
  11 #include <asm/global_data.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 /* Global variables that lcd.c expects to exist */
  16 vidinfo_t panel_info;
  17
  18 static u32 bcm2835_pitch;
  19
  20 struct msg_query {
  21         struct bcm2835_mbox_hdr hdr;
  22         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  23         u32 end_tag;
  24 };
  25
  26 struct msg_setup {
  27         struct bcm2835_mbox_hdr hdr;
  28         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  29         struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
  30         struct bcm2835_mbox_tag_depth depth;
  31         struct bcm2835_mbox_tag_pixel_order pixel_order;
  32         struct bcm2835_mbox_tag_alpha_mode alpha_mode;
  33         struct bcm2835_mbox_tag_virtual_offset virtual_offset;
  34         struct bcm2835_mbox_tag_overscan overscan;
  35         struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
  36         struct bcm2835_mbox_tag_pitch pitch;
  37         u32 end_tag;
  38 };
  39
  40 void lcd_ctrl_init(void *lcdbase)
  41 {
  42         ALLOC_CACHE_ALIGN_BUFFER(struct msg_query, msg_query, 1);
  43         ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1);
  44         int ret;
  45         u32 w, h;
  46
  47         debug("bcm2835: Query resolution...\n");
  48
  49         BCM2835_MBOX_INIT_HDR(msg_query);
  50         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
  51                                         GET_PHYSICAL_W_H);
  52         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
  53         if (ret) {
  54                 printf("bcm2835: Could not query display resolution\n");
  55                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  56                 return;
  57         }
  58
  59         w = msg_query->physical_w_h.body.resp.width;
  60         h = msg_query->physical_w_h.body.resp.height;
  61
  62         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  63
  64         BCM2835_MBOX_INIT_HDR(msg_setup);
  65         BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
  66         msg_setup->physical_w_h.body.req.width = w;
  67         msg_setup->physical_w_h.body.req.height = h;
  68         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
  69         msg_setup->virtual_w_h.body.req.width = w;
  70         msg_setup->virtual_w_h.body.req.height = h;
  71         BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
  72         msg_setup->depth.body.req.bpp = 16;
  73         BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
  74         msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
  75         BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
  76         msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
  77         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
  78         msg_setup->virtual_offset.body.req.x = 0;
  79         msg_setup->virtual_offset.body.req.y = 0;
  80         BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
  81         msg_setup->overscan.body.req.top = 0;
  82         msg_setup->overscan.body.req.bottom = 0;
  83         msg_setup->overscan.body.req.left = 0;
  84         msg_setup->overscan.body.req.right = 0;
  85         BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
  86         msg_setup->allocate_buffer.body.req.alignment = 0x100;
  87         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
  88
  89         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
  90         if (ret) {
  91                 printf("bcm2835: Could not configure display\n");
  92                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  93                 return;
  94         }
  95
  96         w = msg_setup->physical_w_h.body.resp.width;
  97         h = msg_setup->physical_w_h.body.resp.height;
  98         bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
  99
 100         debug("bcm2835: Final resolution is %d x %d\n", w, h);
 101
 102         panel_info.vl_col = w;
 103         panel_info.vl_row = h;
 104         panel_info.vl_bpix = LCD_COLOR16;
 105
 106         gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address;
 107 }
 108
 109 void lcd_enable(void)
 110 {
 111 }
 112
 113 int lcd_get_size(int *line_length)
 114 {
 115         *line_length = bcm2835_pitch;
 116         return *line_length * panel_info.vl_row;
 117 }