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70997d88c4
The bcm283x chips provide a way for the ARM core to communicate with the graphics processor, which is in charge of many things. This is handled by way of a message prototcol. At present the code for sending message (and receiving a reply) is spread around U-Boot, primarily in the board file. This means that sending a message from a driver requires duplicating the code. Create a new message implementation with a function to support powering on a subsystem as a starting point. Signed-off-by: Simon Glass <sjg@chromium.org>
40 lines
900 B
C
40 lines
900 B
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 <memalign.h>
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#include <asm/arch/mbox.h>
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struct msg_set_power_state {
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struct bcm2835_mbox_hdr hdr;
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struct bcm2835_mbox_tag_set_power_state set_power_state;
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u32 end_tag;
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};
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int bcm2835_power_on_module(u32 module)
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{
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ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
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int ret;
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BCM2835_MBOX_INIT_HDR(msg_pwr);
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BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
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SET_POWER_STATE);
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msg_pwr->set_power_state.body.req.device_id = module;
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msg_pwr->set_power_state.body.req.state =
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BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
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BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
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ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
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&msg_pwr->hdr);
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if (ret) {
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printf("bcm2835: Could not set module %u power state\n",
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module);
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return -EIO;
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}
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return 0;
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}
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