|
@@ -0,0 +1,92 @@
|
|
|
+// SPDX-License-Identifier: GPL-2.0+
|
|
|
+/*
|
|
|
+ * Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
|
|
|
+ */
|
|
|
+
|
|
|
+#include <common.h>
|
|
|
+#include <dm.h>
|
|
|
+#include <mailbox-uclass.h>
|
|
|
+#include <asm/io.h>
|
|
|
+#include <linux/apple-mailbox.h>
|
|
|
+#include <linux/delay.h>
|
|
|
+
|
|
|
+#define REG_A2I_STAT 0x110
|
|
|
+#define REG_A2I_STAT_EMPTY BIT(17)
|
|
|
+#define REG_A2I_STAT_FULL BIT(16)
|
|
|
+#define REG_I2A_STAT 0x114
|
|
|
+#define REG_I2A_STAT_EMPTY BIT(17)
|
|
|
+#define REG_I2A_STAT_FULL BIT(16)
|
|
|
+#define REG_A2I_MSG0 0x800
|
|
|
+#define REG_A2I_MSG1 0x808
|
|
|
+#define REG_I2A_MSG0 0x830
|
|
|
+#define REG_I2A_MSG1 0x838
|
|
|
+
|
|
|
+struct apple_mbox_priv {
|
|
|
+ void *base;
|
|
|
+};
|
|
|
+
|
|
|
+static int apple_mbox_of_xlate(struct mbox_chan *chan,
|
|
|
+ struct ofnode_phandle_args *args)
|
|
|
+{
|
|
|
+ if (args->args_count != 0)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int apple_mbox_send(struct mbox_chan *chan, const void *data)
|
|
|
+{
|
|
|
+ struct apple_mbox_priv *priv = dev_get_priv(chan->dev);
|
|
|
+ const struct apple_mbox_msg *msg = data;
|
|
|
+
|
|
|
+ writeq(msg->msg0, priv->base + REG_A2I_MSG0);
|
|
|
+ writeq(msg->msg1, priv->base + REG_A2I_MSG1);
|
|
|
+ while (readl(priv->base + REG_A2I_STAT) & REG_A2I_STAT_FULL)
|
|
|
+ udelay(1);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int apple_mbox_recv(struct mbox_chan *chan, void *data)
|
|
|
+{
|
|
|
+ struct apple_mbox_priv *priv = dev_get_priv(chan->dev);
|
|
|
+ struct apple_mbox_msg *msg = data;
|
|
|
+
|
|
|
+ if (readl(priv->base + REG_I2A_STAT) & REG_I2A_STAT_EMPTY)
|
|
|
+ return -ENODATA;
|
|
|
+
|
|
|
+ msg->msg0 = readq(priv->base + REG_I2A_MSG0);
|
|
|
+ msg->msg1 = readq(priv->base + REG_I2A_MSG1);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+struct mbox_ops apple_mbox_ops = {
|
|
|
+ .of_xlate = apple_mbox_of_xlate,
|
|
|
+ .send = apple_mbox_send,
|
|
|
+ .recv = apple_mbox_recv,
|
|
|
+};
|
|
|
+
|
|
|
+static int apple_mbox_probe(struct udevice *dev)
|
|
|
+{
|
|
|
+ struct apple_mbox_priv *priv = dev_get_priv(dev);
|
|
|
+
|
|
|
+ priv->base = dev_read_addr_ptr(dev);
|
|
|
+ if (!priv->base)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct udevice_id apple_mbox_of_match[] = {
|
|
|
+ { .compatible = "apple,asc-mailbox-v4" },
|
|
|
+ { /* sentinel */ }
|
|
|
+};
|
|
|
+
|
|
|
+U_BOOT_DRIVER(apple_mbox) = {
|
|
|
+ .name = "apple-mbox",
|
|
|
+ .id = UCLASS_MAILBOX,
|
|
|
+ .of_match = apple_mbox_of_match,
|
|
|
+ .probe = apple_mbox_probe,
|
|
|
+ .priv_auto = sizeof(struct apple_mbox_priv),
|
|
|
+ .ops = &apple_mbox_ops,
|
|
|
+};
|