Most Apple IOPs run a firmware that is based on what Apple calls RTKit. RTKit implements a common mailbox protocol. This code provides an implementation of the AP side of this protocol, providing a function to initialize RTKit-based firmwares as well as a function to do a clean shutdown of this firmware.
Signed-off-by: Mark Kettenis kettenis@openbsd.org Reviewed-by: Simon Glass sjg@chromium.org Tested on: Macbook Air M1 Tested-by: Simon Glass sjg@chromium.org ---
ChangeLog:
v2: - Change include paths to take advantage of SYS_SOC change
arch/arm/include/asm/arch-apple/rtkit.h | 11 ++ arch/arm/mach-apple/Makefile | 1 + arch/arm/mach-apple/rtkit.c | 231 ++++++++++++++++++++++++ 3 files changed, 243 insertions(+) create mode 100644 arch/arm/include/asm/arch-apple/rtkit.h create mode 100644 arch/arm/mach-apple/rtkit.c
diff --git a/arch/arm/include/asm/arch-apple/rtkit.h b/arch/arm/include/asm/arch-apple/rtkit.h new file mode 100644 index 0000000000..51f77f298c --- /dev/null +++ b/arch/arm/include/asm/arch-apple/rtkit.h @@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2021 Mark Kettenis kettenis@openbsd.org + */ + +#define APPLE_RTKIT_PWR_STATE_SLEEP 0x01 +#define APPLE_RTKIT_PWR_STATE_QUIESCED 0x10 +#define APPLE_RTKIT_PWR_STATE_ON 0x20 + +int apple_rtkit_init(struct mbox_chan *); +int apple_rtkit_shutdown(struct mbox_chan *, int); diff --git a/arch/arm/mach-apple/Makefile b/arch/arm/mach-apple/Makefile index e74a8c9df1..52f30a777b 100644 --- a/arch/arm/mach-apple/Makefile +++ b/arch/arm/mach-apple/Makefile @@ -2,3 +2,4 @@
obj-y += board.o obj-y += lowlevel_init.o +obj-y += rtkit.o diff --git a/arch/arm/mach-apple/rtkit.c b/arch/arm/mach-apple/rtkit.c new file mode 100644 index 0000000000..dff475cab7 --- /dev/null +++ b/arch/arm/mach-apple/rtkit.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2021 Mark Kettenis kettenis@openbsd.org + * (C) Copyright 2021 Copyright The Asahi Linux Contributors + */ + +#include <common.h> +#include <mailbox.h> +#include <malloc.h> + +#include <asm/arch/rtkit.h> +#include <linux/apple-mailbox.h> +#include <linux/bitfield.h> + +#define APPLE_RTKIT_EP_MGMT 0 +#define APPLE_RTKIT_EP_CRASHLOG 1 +#define APPLE_RTKIT_EP_SYSLOG 2 +#define APPLE_RTKIT_EP_DEBUG 3 +#define APPLE_RTKIT_EP_IOREPORT 4 + +/* Messages for management endpoint. */ +#define APPLE_RTKIT_MGMT_TYPE GENMASK(59, 52) + +#define APPLE_RTKIT_MGMT_PWR_STATE GENMASK(15, 0) + +#define APPLE_RTKIT_MGMT_HELLO 1 +#define APPLE_RTKIT_MGMT_HELLO_REPLY 2 +#define APPLE_RTKIT_MGMT_HELLO_MINVER GENMASK(15, 0) +#define APPLE_RTKIT_MGMT_HELLO_MAXVER GENMASK(31, 16) + +#define APPLE_RTKIT_MGMT_STARTEP 5 +#define APPLE_RTKIT_MGMT_STARTEP_EP GENMASK(39, 32) +#define APPLE_RTKIT_MGMT_STARTEP_FLAG BIT(1) + +#define APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE 6 +#define APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE_ACK 7 + +#define APPLE_RTKIT_MGMT_EPMAP 8 +#define APPLE_RTKIT_MGMT_EPMAP_LAST BIT(51) +#define APPLE_RTKIT_MGMT_EPMAP_BASE GENMASK(34, 32) +#define APPLE_RTKIT_MGMT_EPMAP_BITMAP GENMASK(31, 0) + +#define APPLE_RTKIT_MGMT_EPMAP_REPLY 8 +#define APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE BIT(0) + +#define APPLE_RTKIT_MIN_SUPPORTED_VERSION 11 +#define APPLE_RTKIT_MAX_SUPPORTED_VERSION 12 + +/* Messages for internal endpoints. */ +#define APPLE_RTKIT_BUFFER_REQUEST 1 +#define APPLE_RTKIT_BUFFER_REQUEST_SIZE GENMASK(51, 44) +#define APPLE_RTKIT_BUFFER_REQUEST_IOVA GENMASK(41, 0) + +int apple_rtkit_init(struct mbox_chan *chan) +{ + struct apple_mbox_msg msg; + int endpoints[256]; + int nendpoints = 0; + int endpoint; + int min_ver, max_ver, want_ver; + int msgtype, pwrstate; + u64 reply; + u32 bitmap, base; + int i, ret; + + /* Wakup the IOP. */ + msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE) | + FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, APPLE_RTKIT_PWR_STATE_ON); + msg.msg1 = APPLE_RTKIT_EP_MGMT; + ret = mbox_send(chan, &msg); + if (ret < 0) + return ret; + + /* Wait for protocol version negotiation message. */ + ret = mbox_recv(chan, &msg, 10000); + if (ret < 0) + return ret; + + endpoint = msg.msg1; + msgtype = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg.msg0); + if (endpoint != APPLE_RTKIT_EP_MGMT) { + printf("%s: unexpected endpoint %d\n", __func__, endpoint); + return -EINVAL; + } + if (msgtype != APPLE_RTKIT_MGMT_HELLO) { + printf("%s: unexpected message type %d\n", __func__, msgtype); + return -EINVAL; + } + + min_ver = FIELD_GET(APPLE_RTKIT_MGMT_HELLO_MINVER, msg.msg0); + max_ver = FIELD_GET(APPLE_RTKIT_MGMT_HELLO_MAXVER, msg.msg0); + want_ver = min(APPLE_RTKIT_MAX_SUPPORTED_VERSION, max_ver); + + if (min_ver > APPLE_RTKIT_MAX_SUPPORTED_VERSION) { + printf("%s: firmware min version %d is too new\n", + __func__, min_ver); + return -ENOTSUPP; + } + + if (max_ver < APPLE_RTKIT_MIN_SUPPORTED_VERSION) { + printf("%s: firmware max version %d is too old\n", + __func__, max_ver); + return -ENOTSUPP; + } + + /* Ack version. */ + msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_HELLO_REPLY) | + FIELD_PREP(APPLE_RTKIT_MGMT_HELLO_MINVER, want_ver) | + FIELD_PREP(APPLE_RTKIT_MGMT_HELLO_MAXVER, want_ver); + msg.msg1 = APPLE_RTKIT_EP_MGMT; + ret = mbox_send(chan, &msg); + if (ret < 0) + return ret; + +wait_epmap: + /* Wait for endpoint map message. */ + ret = mbox_recv(chan, &msg, 10000); + if (ret < 0) + return ret; + + endpoint = msg.msg1; + msgtype = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg.msg0); + if (endpoint != APPLE_RTKIT_EP_MGMT) { + printf("%s: unexpected endpoint %d\n", __func__, endpoint); + return -EINVAL; + } + if (msgtype != APPLE_RTKIT_MGMT_EPMAP) { + printf("%s: unexpected message type %d\n", __func__, msgtype); + return -EINVAL; + } + + bitmap = FIELD_GET(APPLE_RTKIT_MGMT_EPMAP_BITMAP, msg.msg0); + base = FIELD_GET(APPLE_RTKIT_MGMT_EPMAP_BASE, msg.msg0); + for (i = 0; i < 32; i++) { + if (bitmap & (1U << i)) + endpoints[nendpoints++] = base * 32 + i; + } + + /* Ack endpoint map. */ + reply = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_EPMAP_REPLY) | + FIELD_PREP(APPLE_RTKIT_MGMT_EPMAP_BASE, base); + if (msg.msg0 & APPLE_RTKIT_MGMT_EPMAP_LAST) + reply |= APPLE_RTKIT_MGMT_EPMAP_LAST; + else + reply |= APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE; + msg.msg0 = reply; + msg.msg1 = APPLE_RTKIT_EP_MGMT; + ret = mbox_send(chan, &msg); + if (ret < 0) + return ret; + + if (reply & APPLE_RTKIT_MGMT_EPMAP_REPLY_MORE) + goto wait_epmap; + + for (i = 0; i < nendpoints; i++) { + /* Don't start the syslog endpoint since we can't + easily handle its messages in U-Boot. */ + if (endpoints[i] == APPLE_RTKIT_EP_SYSLOG) + continue; + + /* Request endpoint. */ + msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_STARTEP) | + FIELD_PREP(APPLE_RTKIT_MGMT_STARTEP_EP, endpoints[i]) | + APPLE_RTKIT_MGMT_STARTEP_FLAG; + msg.msg1 = APPLE_RTKIT_EP_MGMT; + ret = mbox_send(chan, &msg); + if (ret < 0) + return ret; + } + + pwrstate = APPLE_RTKIT_PWR_STATE_SLEEP; + while (pwrstate != APPLE_RTKIT_PWR_STATE_ON) { + ret = mbox_recv(chan, &msg, 100000); + if (ret < 0) + return ret; + + endpoint = msg.msg1; + msgtype = FIELD_GET(APPLE_RTKIT_MGMT_TYPE, msg.msg0); + + if (endpoint == APPLE_RTKIT_EP_CRASHLOG || + endpoint == APPLE_RTKIT_EP_SYSLOG || + endpoint == APPLE_RTKIT_EP_IOREPORT) { + u64 addr = FIELD_GET(APPLE_RTKIT_BUFFER_REQUEST_IOVA, msg.msg0); + u64 size = FIELD_GET(APPLE_RTKIT_BUFFER_REQUEST_SIZE, msg.msg0); + + if (msgtype == APPLE_RTKIT_BUFFER_REQUEST && addr != 0) + continue; + + msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_BUFFER_REQUEST) | + FIELD_PREP(APPLE_RTKIT_BUFFER_REQUEST_SIZE, size) | + FIELD_PREP(APPLE_RTKIT_BUFFER_REQUEST_IOVA, addr); + msg.msg1 = endpoint; + ret = mbox_send(chan, &msg); + if (ret < 0) + return ret; + continue; + } + + if (endpoint != APPLE_RTKIT_EP_MGMT) { + printf("%s: unexpected endpoint %d\n", __func__, endpoint); + return -EINVAL; + } + if (msgtype != APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE_ACK) { + printf("%s: unexpected message type %d\n", __func__, msgtype); + return -EINVAL; + } + + pwrstate = FIELD_GET(APPLE_RTKIT_MGMT_PWR_STATE, msg.msg0); + } + + return 0; +} + +int apple_rtkit_shutdown(struct mbox_chan *chan, int pwrstate) +{ + struct apple_mbox_msg msg; + int ret; + + msg.msg0 = FIELD_PREP(APPLE_RTKIT_MGMT_TYPE, APPLE_RTKIT_MGMT_SET_IOP_PWR_STATE) | + FIELD_PREP(APPLE_RTKIT_MGMT_PWR_STATE, pwrstate); + msg.msg1 = APPLE_RTKIT_EP_MGMT; + ret = mbox_send(chan, &msg); + if (ret < 0) + return ret; + + ret = mbox_recv(chan, &msg, 100000); + if (ret < 0) + return ret; + + return 0; +}