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499cb93dec
Set the ops structure as static const. The structure is not accessible from outside of this driver and is not going to be modified at runtime. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Acked-by: Mark Kettenis <kettenis@openbsd.org>
92 lines
2.1 KiB
C
92 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 <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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static const 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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