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         u32 fb_start, fb_end;
  48
  49         debug("bcm2835: Query resolution...\n");
  50
  51         BCM2835_MBOX_INIT_HDR(msg_query);
  52         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
  53                                         GET_PHYSICAL_W_H);
  54         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
  55         if (ret) {
  56                 printf("bcm2835: Could not query display resolution\n");
  57                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  58                 return;
  59         }
  60
  61         w = msg_query->physical_w_h.body.resp.width;
  62         h = msg_query->physical_w_h.body.resp.height;
  63
  64         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  65
  66         BCM2835_MBOX_INIT_HDR(msg_setup);
  67         BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
  68         msg_setup->physical_w_h.body.req.width = w;
  69         msg_setup->physical_w_h.body.req.height = h;
  70         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
  71         msg_setup->virtual_w_h.body.req.width = w;
  72         msg_setup->virtual_w_h.body.req.height = h;
  73         BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
  74         msg_setup->depth.body.req.bpp = 32;
  75         BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
  76         msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_RGB;
  77         BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
  78         msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
  79         BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
  80         msg_setup->virtual_offset.body.req.x = 0;
  81         msg_setup->virtual_offset.body.req.y = 0;
  82         BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
  83         msg_setup->overscan.body.req.top = 0;
  84         msg_setup->overscan.body.req.bottom = 0;
  85         msg_setup->overscan.body.req.left = 0;
  86         msg_setup->overscan.body.req.right = 0;
  87         BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
  88         msg_setup->allocate_buffer.body.req.alignment = 0x100;
  89         BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
  90
  91         ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
  92         if (ret) {
  93                 printf("bcm2835: Could not configure display\n");
  94                 /* FIXME: How to disable the LCD to prevent errors? hang()? */
  95                 return;
  96         }
  97
  98         w = msg_setup->physical_w_h.body.resp.width;
  99         h = msg_setup->physical_w_h.body.resp.height;
 100         bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
 101
 102         debug("bcm2835: Final resolution is %d x %d\n", w, h);
 103
 104         panel_info.vl_col = w;
 105         panel_info.vl_row = h;
 106         panel_info.vl_bpix = LCD_COLOR32;
 107
 108         gd->fb_base = bus_to_phys(
 109                 msg_setup->allocate_buffer.body.resp.fb_address);
 110
 111         /* Enable dcache for the frame buffer */
 112         fb_start = gd->fb_base & ~(MMU_SECTION_SIZE - 1);
 113         fb_end = gd->fb_base + msg_setup->allocate_buffer.body.resp.fb_size;
 114         fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
 115         mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
 116                 DCACHE_WRITEBACK);
 117         lcd_set_flush_dcache(1);
 118 }
 119
 120 void lcd_enable(void)
 121 {
 122 }
 123
 124 int lcd_get_size(int *line_length)
 125 {
 126         *line_length = bcm2835_pitch;
 127         return *line_length * panel_info.vl_row;
 128 }