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arm: apple: rtkit: Add a generic RTKit helper driver

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This driver handles the MTP ASC coprocessor, which does not need any
special handling on the RTKit side and communicates out-of-band.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Hector Martin
2025-04-20 13:58:05 +02:00
committed by Tom Rini
parent 89cb15788a
commit 7bac7f5f01
3 changed files with 100 additions and 0 deletions
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2
arch/arm/include/asm/arch-apple/rtkit.h
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@@ -29,3 +29,5 @@ int apple_rtkit_boot(struct apple_rtkit *rtk);
int apple_rtkit_set_ap_power(struct apple_rtkit *rtk, int pwrstate);
int apple_rtkit_poll(struct apple_rtkit *rtk, ulong timeout);
int apple_rtkit_shutdown(struct apple_rtkit *rtk, int pwrstate);
int apple_rtkit_helper_poll(struct udevice *dev, ulong timeout);

1
arch/arm/mach-apple/Makefile
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@@ -3,4 +3,5 @@
obj-y += board.o
obj-y += lowlevel_init.o
obj-y += rtkit.o
obj-$(CONFIG_APPLE_MTP_KEYB) += rtkit_helper.o
obj-$(CONFIG_NVME_APPLE) += sart.o

97
arch/arm/mach-apple/rtkit_helper.c Normal file
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@@ -0,0 +1,97 @@
// SPDX-License-Identifier: GPL-2.0+ OR MIT
/*
* Copyright The Asahi Linux Contributors
*/
#include <dm.h>
#include <mailbox.h>
#include <mapmem.h>
#include <reset.h>
#include <asm/io.h>
#include <asm/arch/rtkit.h>
#include <linux/iopoll.h>
/* ASC registers */
#define REG_CPU_CTRL 0x0044
#define REG_CPU_CTRL_RUN BIT(4)
struct rtkit_helper_priv {
void *asc; /* ASC registers */
struct mbox_chan chan;
struct apple_rtkit *rtk;
};
static int rtkit_helper_probe(struct udevice *dev)
{
struct rtkit_helper_priv *priv = dev_get_priv(dev);
u32 ctrl;
int ret;
priv->asc = dev_read_addr_ptr(dev);
if (!priv->asc)
return -EINVAL;
ret = mbox_get_by_index(dev, 0, &priv->chan);
if (ret < 0)
return ret;
ctrl = readl(priv->asc + REG_CPU_CTRL);
writel(ctrl | REG_CPU_CTRL_RUN, priv->asc + REG_CPU_CTRL);
priv->rtk = apple_rtkit_init(&priv->chan, priv, NULL, NULL);
if (!priv->rtk)
return -ENOMEM;
ret = apple_rtkit_boot(priv->rtk);
if (ret < 0) {
printf("%s: Helper apple_rtkit_boot returned: %d\n", __func__, ret);
return ret;
}
ret = apple_rtkit_set_ap_power(priv->rtk, APPLE_RTKIT_PWR_STATE_ON);
if (ret < 0) {
printf("%s: Helper apple_rtkit_set_ap_power returned: %d\n", __func__, ret);
return ret;
}
return 0;
}
static int rtkit_helper_remove(struct udevice *dev)
{
struct rtkit_helper_priv *priv = dev_get_priv(dev);
u32 ctrl;
apple_rtkit_shutdown(priv->rtk, APPLE_RTKIT_PWR_STATE_QUIESCED);
ctrl = readl(priv->asc + REG_CPU_CTRL);
writel(ctrl & ~REG_CPU_CTRL_RUN, priv->asc + REG_CPU_CTRL);
apple_rtkit_free(priv->rtk);
priv->rtk = NULL;
return 0;
}
int apple_rtkit_helper_poll(struct udevice *dev, ulong timeout)
{
struct rtkit_helper_priv *priv = dev_get_priv(dev);
return apple_rtkit_poll(priv->rtk, timeout);
}
static const struct udevice_id rtkit_helper_ids[] = {
{ .compatible = "apple,rtk-helper-asc4" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(rtkit_helper) = {
.name = "rtkit_helper",
.id = UCLASS_MISC,
.of_match = rtkit_helper_ids,
.priv_auto = sizeof(struct rtkit_helper_priv),
.probe = rtkit_helper_probe,
.remove = rtkit_helper_remove,
.flags = DM_FLAG_OS_PREPARE,
};