git.sur5r.net Git - u-boot/blob - 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 <phys2bus.h>
  11 #include <asm/arch/mbox.h>
  12 #include <asm/global_data.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 /* Global variables that lcd.c expects to exist */
  17 vidinfo_t panel_info;
  18
  19 static u32 bcm2835_pitch;
  20
  21 struct msg_query {
  22         struct bcm2835_mbox_hdr hdr;
  23         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  24         u32 end_tag;
  25 };
  26
  27 struct msg_setup {
  28         struct bcm2835_mbox_hdr hdr;
  29         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  30         struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
  31         struct bcm2835_mbox_tag_depth depth;
  32         struct bcm2835_mbox_tag_pixel_order pixel_order;
  33         struct bcm2835_mbox_tag_alpha_mode alpha_mode;
  34         struct bcm2835_mbox_tag_virtual_offset virtual_offset;
  35         struct bcm2835_mbox_tag_overscan overscan;
  36         struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
  37         struct bcm2835_mbox_tag_pitch pitch;
  38         u32 end_tag;
  39 };
  40
  41 void lcd_ctrl_init(void *lcdbase)
  42 {
  43         ALLOC_CACHE_ALIGN_BUFFER(struct msg_query, msg_query, 1);
  44         ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1);
  45         int ret;
  46         u32 w, h;
  47
  48         debug("bcm2835: Query resolution...\n");
  49
  50         BCM2835_MBOX_INIT_HDR(msg_query);
  51         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
  52                                         GET_PHYSICAL_W_H);
  53         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
  54         if (ret) {
  55                 printf("bcm2835: Could not query display resolution\n");
  56                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  57                 return;
  58         }
  59
  60         w = msg_query->physical_w_h.body.resp.width;
  61         h = msg_query->physical_w_h.body.resp.height;
  62
  63         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  64
  65         BCM2835_MBOX_INIT_HDR(msg_setup);
  66         BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
  67         msg_setup->physical_w_h.body.req.width = w;
  68         msg_setup->physical_w_h.body.req.height = h;
  69         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
  70         msg_setup->virtual_w_h.body.req.width = w;
  71         msg_setup->virtual_w_h.body.req.height = h;
  72         BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
  73         msg_setup->depth.body.req.bpp = 16;
  74         BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
  75         msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
  76         BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
  77         msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
  78         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
  79         msg_setup->virtual_offset.body.req.x = 0;
  80         msg_setup->virtual_offset.body.req.y = 0;
  81         BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
  82         msg_setup->overscan.body.req.top = 0;
  83         msg_setup->overscan.body.req.bottom = 0;
  84         msg_setup->overscan.body.req.left = 0;
  85         msg_setup->overscan.body.req.right = 0;
  86         BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
  87         msg_setup->allocate_buffer.body.req.alignment = 0x100;
  88         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
  89
  90         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
  91         if (ret) {
  92                 printf("bcm2835: Could not configure display\n");
  93                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  94                 return;
  95         }
  96
  97         w = msg_setup->physical_w_h.body.resp.width;
  98         h = msg_setup->physical_w_h.body.resp.height;
  99         bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
 100
 101         debug("bcm2835: Final resolution is %d x %d\n", w, h);
 102
 103         panel_info.vl_col = w;
 104         panel_info.vl_row = h;
 105         panel_info.vl_bpix = LCD_COLOR16;
 106
 107         gd->fb_base = bus_to_phys(
 108                 msg_setup->allocate_buffer.body.resp.fb_address);
 109 }
 110
 111 void lcd_enable(void)
 112 {
 113 }
 114
 115 int lcd_get_size(int *line_length)
 116 {
 117         *line_length = bcm2835_pitch;
 118         return *line_length * panel_info.vl_row;
 119 }