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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
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*/
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#include <common.h>
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#include <dm.h>
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#include <mailbox-uclass.h>
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#include <asm/io.h>
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#include <linux/apple-mailbox.h>
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#include <linux/delay.h>
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#define REG_A2I_STAT 0x110
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#define REG_A2I_STAT_EMPTY BIT(17)
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#define REG_A2I_STAT_FULL BIT(16)
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#define REG_I2A_STAT 0x114
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#define REG_I2A_STAT_EMPTY BIT(17)
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#define REG_I2A_STAT_FULL BIT(16)
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#define REG_A2I_MSG0 0x800
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#define REG_A2I_MSG1 0x808
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#define REG_I2A_MSG0 0x830
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#define REG_I2A_MSG1 0x838
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struct apple_mbox_priv {
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void *base;
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};
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static int apple_mbox_of_xlate(struct mbox_chan *chan,
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struct ofnode_phandle_args *args)
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{
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if (args->args_count != 0)
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return -EINVAL;
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return 0;
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}
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static int apple_mbox_send(struct mbox_chan *chan, const void *data)
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{
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struct apple_mbox_priv *priv = dev_get_priv(chan->dev);
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const struct apple_mbox_msg *msg = data;
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writeq(msg->msg0, priv->base + REG_A2I_MSG0);
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writeq(msg->msg1, priv->base + REG_A2I_MSG1);
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while (readl(priv->base + REG_A2I_STAT) & REG_A2I_STAT_FULL)
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udelay(1);
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return 0;
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}
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static int apple_mbox_recv(struct mbox_chan *chan, void *data)
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{
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struct apple_mbox_priv *priv = dev_get_priv(chan->dev);
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struct apple_mbox_msg *msg = data;
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if (readl(priv->base + REG_I2A_STAT) & REG_I2A_STAT_EMPTY)
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return -ENODATA;
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msg->msg0 = readq(priv->base + REG_I2A_MSG0);
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msg->msg1 = readq(priv->base + REG_I2A_MSG1);
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return 0;
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}
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struct mbox_ops apple_mbox_ops = {
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.of_xlate = apple_mbox_of_xlate,
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.send = apple_mbox_send,
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.recv = apple_mbox_recv,
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};
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static int apple_mbox_probe(struct udevice *dev)
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{
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struct apple_mbox_priv *priv = dev_get_priv(dev);
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priv->base = dev_read_addr_ptr(dev);
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if (!priv->base)
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return -EINVAL;
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return 0;
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}
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static const struct udevice_id apple_mbox_of_match[] = {
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{ .compatible = "apple,asc-mailbox-v4" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(apple_mbox) = {
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.name = "apple-mbox",
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.id = UCLASS_MAILBOX,
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.of_match = apple_mbox_of_match,
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.probe = apple_mbox_probe,
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.priv_auto = sizeof(struct apple_mbox_priv),
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.ops = &apple_mbox_ops,
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};
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