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