mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-11 13:46:17 +09:00
1382648b6b
The FB address is generated by the firmware running on the GPU/VideoCore and is a "bus" address. This address is the other side of an IOMMU from the ARM upon which U-Boot is running. Use bus_to_phys() to convert this to an ARM physical address. Without this, U-Boot seems to work just fine, but once the Linux kernel boots on an RPi2, accessing the FB memory often causes a hard system hang. This is related to:122426d46eARM: bcm2835: use phys_to_bus() for mbox5c0beb5c58usb: dwc2: use phys_to_bus/bus_to_phys79340db7f1ARM: bcm2835: implement phys_to_bus/bus_to_phys Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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* (C) Copyright 2012 Stephen Warren
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <lcd.h>
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#include <memalign.h>
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#include <phys2bus.h>
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#include <asm/arch/mbox.h>
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#include <asm/global_data.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Global variables that lcd.c expects to exist */
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vidinfo_t panel_info;
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static u32 bcm2835_pitch;
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struct msg_query {
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struct bcm2835_mbox_hdr hdr;
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struct bcm2835_mbox_tag_physical_w_h physical_w_h;
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u32 end_tag;
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};
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struct msg_setup {
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struct bcm2835_mbox_hdr hdr;
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struct bcm2835_mbox_tag_physical_w_h physical_w_h;
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struct bcm2835_mbox_tag_virtual_w_h virtual_w_h;
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struct bcm2835_mbox_tag_depth depth;
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struct bcm2835_mbox_tag_pixel_order pixel_order;
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struct bcm2835_mbox_tag_alpha_mode alpha_mode;
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struct bcm2835_mbox_tag_virtual_offset virtual_offset;
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struct bcm2835_mbox_tag_overscan overscan;
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struct bcm2835_mbox_tag_allocate_buffer allocate_buffer;
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struct bcm2835_mbox_tag_pitch pitch;
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u32 end_tag;
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};
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void lcd_ctrl_init(void *lcdbase)
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{
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ALLOC_CACHE_ALIGN_BUFFER(struct msg_query, msg_query, 1);
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ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1);
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int ret;
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u32 w, h;
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debug("bcm2835: Query resolution...\n");
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BCM2835_MBOX_INIT_HDR(msg_query);
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BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
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GET_PHYSICAL_W_H);
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ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_query->hdr);
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if (ret) {
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printf("bcm2835: Could not query display resolution\n");
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/* FIXME: How to disable the LCD to prevent errors? hang()? */
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return;
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}
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w = msg_query->physical_w_h.body.resp.width;
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h = msg_query->physical_w_h.body.resp.height;
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debug("bcm2835: Setting up display for %d x %d\n", w, h);
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BCM2835_MBOX_INIT_HDR(msg_setup);
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BCM2835_MBOX_INIT_TAG(&msg_setup->physical_w_h, SET_PHYSICAL_W_H);
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msg_setup->physical_w_h.body.req.width = w;
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msg_setup->physical_w_h.body.req.height = h;
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BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_w_h, SET_VIRTUAL_W_H);
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msg_setup->virtual_w_h.body.req.width = w;
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msg_setup->virtual_w_h.body.req.height = h;
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BCM2835_MBOX_INIT_TAG(&msg_setup->depth, SET_DEPTH);
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msg_setup->depth.body.req.bpp = 16;
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BCM2835_MBOX_INIT_TAG(&msg_setup->pixel_order, SET_PIXEL_ORDER);
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msg_setup->pixel_order.body.req.order = BCM2835_MBOX_PIXEL_ORDER_BGR;
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BCM2835_MBOX_INIT_TAG(&msg_setup->alpha_mode, SET_ALPHA_MODE);
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msg_setup->alpha_mode.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
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BCM2835_MBOX_INIT_TAG(&msg_setup->virtual_offset, SET_VIRTUAL_OFFSET);
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msg_setup->virtual_offset.body.req.x = 0;
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msg_setup->virtual_offset.body.req.y = 0;
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BCM2835_MBOX_INIT_TAG(&msg_setup->overscan, SET_OVERSCAN);
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msg_setup->overscan.body.req.top = 0;
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msg_setup->overscan.body.req.bottom = 0;
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msg_setup->overscan.body.req.left = 0;
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msg_setup->overscan.body.req.right = 0;
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BCM2835_MBOX_INIT_TAG(&msg_setup->allocate_buffer, ALLOCATE_BUFFER);
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msg_setup->allocate_buffer.body.req.alignment = 0x100;
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BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_setup->pitch, GET_PITCH);
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ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_setup->hdr);
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if (ret) {
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printf("bcm2835: Could not configure display\n");
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/* FIXME: How to disable the LCD to prevent errors? hang()? */
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return;
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}
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w = msg_setup->physical_w_h.body.resp.width;
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h = msg_setup->physical_w_h.body.resp.height;
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bcm2835_pitch = msg_setup->pitch.body.resp.pitch;
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debug("bcm2835: Final resolution is %d x %d\n", w, h);
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panel_info.vl_col = w;
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panel_info.vl_row = h;
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panel_info.vl_bpix = LCD_COLOR16;
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gd->fb_base = bus_to_phys(
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msg_setup->allocate_buffer.body.resp.fb_address);
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}
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void lcd_enable(void)
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{
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}
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int lcd_get_size(int *line_length)
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{
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*line_length = bcm2835_pitch;
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return *line_length * panel_info.vl_row;
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}
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