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 = 16; 75 BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER); 76 msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR; 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_COLOR16; 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 } 129