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