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