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 } 115