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/arch/msg.h>
  13 #include <asm/global_data.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 /* Global variables that lcd.c expects to exist */
  18 vidinfo_t panel_info;
  19
  20 static u32 bcm2835_pitch;
  21
  22 struct msg_setup {
  23         struct bcm2835_mbox_hdr hdr;
  24         struct bcm2835_mbox_tag_physical_w_h physical_w_h;
  25         struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
  26         struct bcm2835_mbox_tag_depth depth;
  27         struct bcm2835_mbox_tag_pixel_order pixel_order;
  28         struct bcm2835_mbox_tag_alpha_mode alpha_mode;
  29         struct bcm2835_mbox_tag_virtual_offset virtual_offset;
  30         struct bcm2835_mbox_tag_overscan overscan;
  31         struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
  32         struct bcm2835_mbox_tag_pitch pitch;
  33         u32 end_tag;
  34 };
  35
  36 void lcd_ctrl_init(void *lcdbase)
  37 {
  38         ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1);
  39         int ret;
  40         int w, h;
  41         u32 fb_start, fb_end;
  42
  43         debug("bcm2835: Query resolution...\n");
  44         ret = bcm2835_get_video_size(&w, &h);
  45         if (ret) {
  46                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  47                 return;
  48         }
  49
  50         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  51
  52         BCM2835_MBOX_INIT_HDR(msg_setup);
  53         BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
  54         msg_setup->physical_w_h.body.req.width = w;
  55         msg_setup->physical_w_h.body.req.height = h;
  56         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
  57         msg_setup->virtual_w_h.body.req.width = w;
  58         msg_setup->virtual_w_h.body.req.height = h;
  59         BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
  60         msg_setup->depth.body.req.bpp = 32;
  61         BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
  62         msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_RGB;
  63         BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
  64         msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
  65         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
  66         msg_setup->virtual_offset.body.req.x = 0;
  67         msg_setup->virtual_offset.body.req.y = 0;
  68         BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
  69         msg_setup->overscan.body.req.top = 0;
  70         msg_setup->overscan.body.req.bottom = 0;
  71         msg_setup->overscan.body.req.left = 0;
  72         msg_setup->overscan.body.req.right = 0;
  73         BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
  74         msg_setup->allocate_buffer.body.req.alignment = 0x100;
  75         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
  76
  77         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
  78         if (ret) {
  79                 printf("bcm2835: Could not configure display\n");
  80                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  81                 return;
  82         }
  83
  84         w = msg_setup->physical_w_h.body.resp.width;
  85         h = msg_setup->physical_w_h.body.resp.height;
  86         bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
  87
  88         debug("bcm2835: Final resolution is %d x %d\n", w, h);
  89
  90         panel_info.vl_col = w;
  91         panel_info.vl_row = h;
  92         panel_info.vl_bpix = LCD_COLOR32;
  93
  94         gd->fb_base = bus_to_phys(
  95                 msg_setup->allocate_buffer.body.resp.fb_address);
  96
  97         /* Enable dcache for the frame buffer */
  98         fb_start = gd->fb_base & ~(MMU_SECTION_SIZE - 1);
  99         fb_end = gd->fb_base + msg_setup->allocate_buffer.body.resp.fb_size;
 100         fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
 101         mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
 102                 DCACHE_WRITEBACK);
 103         lcd_set_flush_dcache(1);
 104 }
 105
 106 void lcd_enable(void)
 107 {
 108 }
 109
 110 int lcd_get_size(int *line_length)
 111 {
 112         *line_length = bcm2835_pitch;
 113         return *line_length * panel_info.vl_row;
 114 }