From: Hector Martin <mar...@marcan.st> 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 <mar...@marcan.st> Signed-off-by: Mark Kettenis <kette...@openbsd.org> --- arch/arm/include/asm/arch-apple/rtkit.h | 2 + arch/arm/mach-apple/Makefile | 1 + arch/arm/mach-apple/rtkit_helper.c | 97 +++++++++++++++++++++++++ 3 files changed, 100 insertions(+) create mode 100644 arch/arm/mach-apple/rtkit_helper.c diff --git a/arch/arm/include/asm/arch-apple/rtkit.h b/arch/arm/include/asm/arch-apple/rtkit.h index b795215feb7..1b6c6ccd821 100644 --- a/arch/arm/include/asm/arch-apple/rtkit.h +++ b/arch/arm/include/asm/arch-apple/rtkit.h @@ -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); diff --git a/arch/arm/mach-apple/Makefile b/arch/arm/mach-apple/Makefile index 50b465b9473..d79a3a69592 100644 --- a/arch/arm/mach-apple/Makefile +++ b/arch/arm/mach-apple/Makefile @@ -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 diff --git a/arch/arm/mach-apple/rtkit_helper.c b/arch/arm/mach-apple/rtkit_helper.c new file mode 100644 index 00000000000..3b755008195 --- /dev/null +++ b/arch/arm/mach-apple/rtkit_helper.c @@ -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, +}; -- 2.49.0