[U-Boot] [PATCH 1/3] drivers: Introduce a simplified remoteproc framework
Nishanth Menon
nm at ti.com
Mon Aug 24 19:28:35 CEST 2015
Many System on Chip(SoC) solutions are complex with multiple processors
on the same die dedicated to either general purpose of specialized
functions. Many examples do exist in today's SoCs from various vendors.
Typical examples are micro controllers such as an ARM M3/M0 doing a
offload of specific function such as event integration or power
management or controlling camera etc.
Traditionally, the responsibility of loading up such a processor with a
firmware and communication has been with a High Level Operating
System(HLOS) such as Linux. However, there exists classes of products
where Linux would need to expect services from such a processor or the
delay of Linux and operating system being able to load up such a
firmware is unacceptable.
To address these needs, we need some minimal capability to load such a
system and ensure it is started prior to an Operating System(Linux or
any other) is started up.
NOTE: This is NOT meant to be a solve-all solution, instead, it tries to
address certain class of SoCs and products that need such a solution.
A very simple model is introduced here as part of the initial support
that supports microcontrollers with internal memory (no MMU, no
execution from external memory, or specific image format needs). This
basic framework can then (hopefully) be extensible to other complex SoC
processor support as need be.
Signed-off-by: Nishanth Menon <nm at ti.com>
---
common/Kconfig | 5 +
common/Makefile | 1 +
common/cmd_remoteproc.c | 224 ++++++++++++
doc/device-tree-bindings/remoteproc/remoteproc.txt | 14 +
doc/driver-model/remoteproc-framework.txt | 163 +++++++++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/remoteproc/Kconfig | 15 +
drivers/remoteproc/Makefile | 7 +
drivers/remoteproc/rproc-uclass.c | 406 +++++++++++++++++++++
include/dm/uclass-id.h | 1 +
include/remoteproc.h | 81 ++++
12 files changed, 920 insertions(+)
create mode 100644 common/cmd_remoteproc.c
create mode 100644 doc/device-tree-bindings/remoteproc/remoteproc.txt
create mode 100644 doc/driver-model/remoteproc-framework.txt
create mode 100644 drivers/remoteproc/Kconfig
create mode 100644 drivers/remoteproc/Makefile
create mode 100644 drivers/remoteproc/rproc-uclass.c
create mode 100644 include/remoteproc.h
diff --git a/common/Kconfig b/common/Kconfig
index 88dc0160796e..16420c880919 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -344,6 +344,11 @@ config CMD_FPGA
help
FPGA support.
+config CMD_REMOTEPROC
+ bool "remoteproc"
+ depends on DM_REMOTEPROC
+ help
+ Support for Remote Processor control
endmenu
diff --git a/common/Makefile b/common/Makefile
index dc82433e90de..c3a62a2e1379 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -154,6 +154,7 @@ obj-$(CONFIG_CMD_PXE) += cmd_pxe.o
obj-$(CONFIG_CMD_READ) += cmd_read.o
obj-$(CONFIG_CMD_REGINFO) += cmd_reginfo.o
obj-$(CONFIG_CMD_REISER) += cmd_reiser.o
+obj-$(CONFIG_CMD_REMOTEPROC) += cmd_remoteproc.o
obj-$(CONFIG_SANDBOX) += cmd_host.o
obj-$(CONFIG_CMD_SATA) += cmd_sata.o
obj-$(CONFIG_CMD_SF) += cmd_sf.o
diff --git a/common/cmd_remoteproc.c b/common/cmd_remoteproc.c
new file mode 100644
index 000000000000..e8fdb124e251
--- /dev/null
+++ b/common/cmd_remoteproc.c
@@ -0,0 +1,224 @@
+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated - http://www.ti.com/
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <common.h>
+#include <command.h>
+#include <remoteproc.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+
+static int print_remoteproc_list(void)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+ int ret;
+ char *type;
+
+ ret = uclass_get(UCLASS_RPROC, &uc);
+ if (ret) {
+ printf("Cannot find Remote processor class\n");
+ return ret;
+ }
+
+ uclass_foreach_dev(dev, uc) {
+ struct dm_rproc_uclass_pdata *uc_pdata;
+ const struct dm_rproc_ops *ops = device_get_ops(dev);
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata) {
+ debug("%s: no uclass_platdata?\n", dev->name);
+ return -ENXIO;
+ }
+
+ switch (uc_pdata->mem_type) {
+ case RPROC_INTERNAL_MEMORY_MAPPED:
+ type = "internal memory mapped";
+ break;
+ default:
+ type = "unknown";
+ break;
+ }
+ printf("%d - Name:'%s' type:'%s' supports: %s%s%s%s%s%s\n",
+ dev->seq,
+ uc_pdata->name,
+ type,
+ ops->load ? "load " : "",
+ ops->start ? "start " : "",
+ ops->stop ? "stop " : "",
+ ops->reset ? "reset " : "",
+ ops->is_running ? "is_running " : "",
+ ops->ping ? "ping " : "");
+ }
+ return 0;
+}
+
+static int do_rproc_init(cmd_tbl_t *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ if (rproc_is_initialized()) {
+ printf("\tRemote Processors are already initialized\n");
+ } else {
+ if (!rproc_init())
+ return 0;
+ printf("Few Remote Processors failed to be initalized\n");
+ }
+
+ return CMD_RET_FAILURE;
+}
+
+static int do_remoteproc_list(cmd_tbl_t *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ if (!rproc_is_initialized()) {
+ printf("\t Remote Processors is not initialized\n");
+ return CMD_RET_USAGE;
+ }
+
+ if (print_remoteproc_list())
+ return CMD_RET_FAILURE;
+
+ return 0;
+}
+
+static int do_remoteproc_load(cmd_tbl_t *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ ulong addr, size;
+ int id, ret;
+
+ if (argc != 4)
+ return CMD_RET_USAGE;
+
+ id = (int)simple_strtoul(argv[1], NULL, 3);
+ addr = simple_strtoul(argv[2], NULL, 16);
+
+ size = simple_strtoul(argv[3], NULL, 16);
+
+ if (!size) {
+ printf("\t Expect some size??\n");
+ return CMD_RET_USAGE;
+ }
+
+ if (!rproc_is_initialized()) {
+ printf("\tRemote Processors are not initialized\n");
+ return CMD_RET_USAGE;
+ }
+
+ ret = rproc_load(id, addr, size);
+
+ return ret ? CMD_RET_FAILURE : 0;
+}
+
+static int do_remoteproc_wrapper(cmd_tbl_t *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ int id, ret = CMD_RET_USAGE;
+
+ if (argc != 2)
+ return CMD_RET_USAGE;
+
+ id = (int)simple_strtoul(argv[1], NULL, 3);
+
+ if (!rproc_is_initialized()) {
+ printf("\tRemote Processors are not initialized\n");
+ return CMD_RET_USAGE;
+ }
+
+ if (!strcmp(argv[0], "start")) {
+ ret = rproc_start(id);
+ } else if (!strcmp(argv[0], "stop")) {
+ ret = rproc_stop(id);
+ } else if (!strcmp(argv[0], "reset")) {
+ ret = rproc_reset(id);
+ } else if (!strcmp(argv[0], "is_running")) {
+ ret = rproc_is_running(id);
+ if (!ret) {
+ printf("Remote processor is Running\n");
+ } else if (ret == 1) {
+ printf("Remote processor is NOT Running\n");
+ ret = 0;
+ }
+ /* Else error.. */
+ } else if (!strcmp(argv[0], "ping")) {
+ ret = rproc_ping(id);
+ if (!ret) {
+ printf("Remote processor responds 'Pong'\n");
+ } else if (ret == 1) {
+ printf("No response from Remote processor\n");
+ ret = 0;
+ }
+ /* Else error.. */
+ }
+
+ return ret ? CMD_RET_FAILURE : 0;
+}
+
+static cmd_tbl_t cmd_remoteproc_sub[] = {
+ U_BOOT_CMD_MKENT(init, 0, 1, do_rproc_init,
+ "Enumerate and initialize all processors", ""),
+ U_BOOT_CMD_MKENT(list, 0, 1, do_remoteproc_list,
+ "list remote processors", ""),
+ U_BOOT_CMD_MKENT(load, 5, 1, do_remoteproc_load,
+ "Load remote processor with provided image",
+ "<id> [addr] [size]\n"
+ "- id: ID of the remote processor(see 'list' cmd)\n"
+ "- addr: Address in memory of the image to loadup\n"
+ "- size: Size of the image to loadup\n"),
+ U_BOOT_CMD_MKENT(start, 1, 1, do_remoteproc_wrapper,
+ "Start remote processor",
+ "id - ID of the remote processor (see 'list' cmd)\n"),
+ U_BOOT_CMD_MKENT(stop, 1, 1, do_remoteproc_wrapper,
+ "Stop remote processor",
+ "id - ID of the remote processor (see 'list' cmd)\n"),
+ U_BOOT_CMD_MKENT(reset, 1, 1, do_remoteproc_wrapper,
+ "Reset remote processor",
+ "id - ID of the remote processor (see 'list' cmd)\n"),
+ U_BOOT_CMD_MKENT(is_running, 1, 1, do_remoteproc_wrapper,
+ "Check to see if remote processor is running\n",
+ "id - ID of the remote processor (see 'list' cmd)\n"),
+ U_BOOT_CMD_MKENT(ping, 1, 1, do_remoteproc_wrapper,
+ "Ping to communicate with remote processor\n",
+ "id - ID of the remote processor (see 'list' cmd)\n"),
+};
+
+static int do_remoteproc(cmd_tbl_t *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ cmd_tbl_t *c = NULL;
+
+ /* Strip off leading 'rproc' command argument */
+ argc--;
+ argv++;
+
+ if (argc)
+ c = find_cmd_tbl(argv[0], cmd_remoteproc_sub,
+ ARRAY_SIZE(cmd_remoteproc_sub));
+ if (c)
+ return c->cmd(cmdtp, flag, argc, argv);
+
+ return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(rproc, 5, 1, do_remoteproc,
+ "Control operation of remote processors in an SoC",
+ " [init|list|load|start|stop|reset|ping]\n"
+ "\t\t Where:\n"
+ "\t\t[addr] is a memory address\n"
+ "\t\t<id> is a numerical identifier for the remote processor\n"
+ "\t\t provided by 'list' command.\n"
+ "\t\tNote: Remote processors must be initalized prior to usage\n"
+ "\t\tNote: Services are dependent on the driver capability\n"
+ "\t\t 'list' command shows the capability of each device\n"
+ "\n\tSubcommands:\n"
+ "\tinit - Enumerate and initalize the remote processors\n"
+ "\tlist - list available remote processors\n"
+ "\tload <id> [addr] [size]- Load the remote processor with binary\n"
+ "\t image stored at address [addr] in memory\n"
+ "\tstart <id> - Start the remote processor(must be loaded)\n"
+ "\tstop <id> - Stop the remote processor\n"
+ "\treset <id> - Reset the remote processor\n"
+ "\tis_running <id> - Reports if the remote processor is running\n"
+ "\tping <id> - Ping the remote processor for communication\n");
diff --git a/doc/device-tree-bindings/remoteproc/remoteproc.txt b/doc/device-tree-bindings/remoteproc/remoteproc.txt
new file mode 100644
index 000000000000..1a98a2e3a03c
--- /dev/null
+++ b/doc/device-tree-bindings/remoteproc/remoteproc.txt
@@ -0,0 +1,14 @@
+Remote Processor uClass
+
+Binding:
+
+Remoteproc devices shall have compatible corresponding to thier
+drivers. However the following generic properties will be supported
+
+Optional Properties:
+- remoteproc-name: a string, used if provided to describe the processor.
+ This must be unique in an operational system.
+- remoteproc-internal-memory-mapped: a bool, indicates that the remote
+ processor has internal memory that it uses to execute code and store
+ data. Such a device is not expected to have a MMU. If no type property
+ is provided, the device is assumed to map to such a model.
diff --git a/doc/driver-model/remoteproc-framework.txt b/doc/driver-model/remoteproc-framework.txt
new file mode 100644
index 000000000000..32cb40242e62
--- /dev/null
+++ b/doc/driver-model/remoteproc-framework.txt
@@ -0,0 +1,163 @@
+#
+# (C) Copyright 2015
+# Texas Instruments Incorporated - http://www.ti.com/
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+Remote Processor Framework
+==========================
+TOC:
+1. Introduction
+2. How does it work - The driver
+3. Describing the device using platform data
+4. Describing the device using device tree
+
+1. Introduction
+===============
+
+This is an introduction to driver-model for Remote Processors found
+on various System on Chip(SoCs). The term remote processor is used to
+indicate that this is not the processor on which u-boot is operating
+on, instead is yet another processing entity that may be controlled by
+the processor on which we are functional.
+
+The simplified model depends on a single UCLASS - UCLASS_RPROC
+
+UCLASS_RPROC:
+- drivers/remoteproc/rproc-uclass.c
+- include/remoteproc.h
+
+Commands:
+- common/cmd_remoteproc.c
+
+Configuration:
+CONFIG_DM_REMOTEPROC is selected by drivers as needed
+CONFIG_CMD_REMOTEPROC for the commands if required.
+
+2. How does it work - The driver
+=================================
+
+Overall, the driver statemachine transitions are typically as follows:
+ (entry)
+ +-------+
+ +---+ init |
+ | | | <---------------------+
+ | +-------+ |
+ | |
+ | |
+ | +--------+ |
+Load| | reset | |
+ | | | <----------+ |
+ | +--------+ | |
+ | |Load | |
+ | | | |
+ | +----v----+ reset | |
+ +-> | | (opt) | |
+ | Loaded +-----------+ |
+ | | |
+ +----+----+ |
+ | Start |
+ +---v-----+ (opt) |
+ +->| Running | Stop |
+Ping +- | +--------------------+
+(opt) +---------+
+
+(is_running does not change state)
+opt: Optional state transition implemented by driver.
+
+NOTE: It depends on the remote processor as to the exact behavior
+of the statemachine, remoteproc core does not intent to implement
+statemachine logic. Certain processors may allow start/stop without
+reloading the image in the middle, certain other processors may only
+allow us to start the processor(image from a EEPROM/OTP) etc.
+
+It is hence the responsibility of the driver to handle the requisite
+state transitions of the device as necessary.
+
+Basic design assumptions:
+
+Remote processor can operate on a certain firmware that maybe loaded
+and released from reset.
+
+The driver follows a standard UCLASS DM.
+
+in the bare minimum form:
+
+static const struct dm_rproc_ops sandbox_testproc_ops = {
+ .load = sandbox_testproc_load,
+ .start = sandbox_testproc_start,
+};
+
+static const struct udevice_id sandbox_ids[] = {
+ {.compatible = "sandbox,test-processor"},
+ {}
+};
+
+U_BOOT_DRIVER(sandbox_testproc) = {
+ .name = "sandbox_test_proc",
+ .of_match = sandbox_ids,
+ .id = UCLASS_RPROC,
+ .ops = &sandbox_testproc_ops,
+ .probe = sandbox_testproc_probe,
+};
+
+This allows for the device to be probed as part of the "init" command
+or invocation of 'rproc_init()' function as the system dependencies define.
+
+The driver is expected to maintain it's own statemachine which is
+appropriate for the device it maintains. It must, at the very least
+provide a load and start function. We assume here that the device
+needs to be loaded and started, else, there is no real purpose of
+using the remoteproc framework.
+
+3. Describing the device using platform data
+============================================
+
+Considering that many platforms are yet to move to device-tree model,
+a simplified definition of a device is as follows:
+
+struct dm_rproc_uclass_pdata proc_3_test = {
+ .name = "proc_3_legacy",
+ .mem_type = RPROC_INTERNAL_MEMORY_MAPPED,
+ .driver_plat_data = &mydriver_data;
+};
+
+U_BOOT_DEVICE(proc_3_demo) = {
+ .name = "sandbox_test_proc",
+ .platdata = &proc_3_test,
+};
+
+There can be additional data that may be desired depending on the
+remoteproc driver specific needs (for example: SoC integration
+details such as clock handle or something similar). See appropriate
+documentation for specific remoteproc driver for further details.
+These are passed via driver_plat_data.
+
+3. Describing the device using device tree
+==========================================
+/ {
+ ...
+ aliases {
+ ...
+ remoteproc0 = &rproc_1;
+ remoteproc1 = &rproc_2;
+
+ };
+ ...
+
+ rproc_1: rproc at 1 {
+ compatible = "sandbox,test-processor";
+ remoteproc-name = "remoteproc-test-dev1";
+ };
+
+ rproc_2: rproc at 2 {
+ compatible = "sandbox,test-processor";
+ internal-memory-mapped;
+ remoteproc-name = "remoteproc-test-dev2";
+ };
+ ...
+};
+
+aliases usage is optional, but it is usually recommended to ensure the
+users have a consistent usage model for a platform.
+the compatible string used here is specific to the remoteproc driver involved.
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 092bc02b304e..24bd51269602 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -60,6 +60,8 @@ source "drivers/crypto/Kconfig"
source "drivers/thermal/Kconfig"
+source "drivers/remoteproc/Kconfig"
+
endmenu
config PHYS_TO_BUS
diff --git a/drivers/Makefile b/drivers/Makefile
index a721ec86dfef..7c18113ce133 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -59,5 +59,6 @@ obj-y += input/
# SOC specific infrastructure drivers.
obj-y += soc/
obj-y += thermal/
+obj-$(CONFIG_DM_REMOTEPROC) += remoteproc/
endif
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
new file mode 100644
index 000000000000..700f52caf1dc
--- /dev/null
+++ b/drivers/remoteproc/Kconfig
@@ -0,0 +1,15 @@
+#
+# (C) Copyright 2015
+# Texas Instruments Incorporated - http://www.ti.com/
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+menu "Remote Processor drivers"
+
+# DM_REMOTEPROC gets selected by drivers as needed
+# All users should depend on DM
+config DM_REMOTEPROC
+ bool
+ depends on DM
+
+endmenu
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
new file mode 100644
index 000000000000..af90ace95899
--- /dev/null
+++ b/drivers/remoteproc/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2015
+# Texas Instruments Incorporated - http://www.ti.com/
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_DM_REMOTEPROC) += rproc-uclass.o
diff --git a/drivers/remoteproc/rproc-uclass.c b/drivers/remoteproc/rproc-uclass.c
new file mode 100644
index 000000000000..cafc293f78f3
--- /dev/null
+++ b/drivers/remoteproc/rproc-uclass.c
@@ -0,0 +1,406 @@
+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated - http://www.ti.com/
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#define pr_fmt(fmt) "%s: " fmt, __func__
+#include <common.h>
+#include <dm.h>
+#include <dm/uclass.h>
+#include <dm/uclass-internal.h>
+#include <dm/device-internal.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <remoteproc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int for_each_remoteproc_device(int (*fn) (struct udevice *dev,
+ struct dm_rproc_uclass_pdata *uc_pdata,
+ const void *data),
+ struct udevice *skip_dev,
+ const void *data)
+{
+ struct udevice *dev;
+ struct dm_rproc_uclass_pdata *uc_pdata;
+ int ret;
+
+ for (ret = uclass_find_first_device(UCLASS_RPROC, &dev); dev;
+ ret = uclass_find_next_device(&dev)) {
+ if (ret || dev == skip_dev)
+ continue;
+ uc_pdata = dev_get_uclass_platdata(dev);
+ ret = fn(dev, uc_pdata, data);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int _rproc_name_is_unique(struct udevice *dev,
+ struct dm_rproc_uclass_pdata *uc_pdata,
+ const void *data)
+{
+ const char *check_name = data;
+
+ /* devices not yet populated with data - so skip them */
+ if (!uc_pdata->name && check_name)
+ return 0;
+
+ /* Return 0 to search further if we dont match */
+ if (strlen(uc_pdata->name) != strlen(check_name))
+ return 0;
+
+ if (!strcmp(uc_pdata->name, check_name))
+ return -EINVAL;
+
+ return 0;
+}
+
+static bool rproc_name_is_unique(struct udevice *check_dev,
+ const char *check_name)
+{
+ int ret;
+
+ ret = for_each_remoteproc_device(_rproc_name_is_unique,
+ check_dev, check_name);
+ return ret ? false : true;
+}
+
+static struct udevice *rproc_find_dev_for_id(int id)
+{
+ struct udevice *dev;
+ int ret;
+
+ for (ret = uclass_find_first_device(UCLASS_RPROC, &dev); dev;
+ ret = uclass_find_next_device(&dev)) {
+ if (ret)
+ continue;
+ if (dev->seq == id)
+ return dev;
+ }
+
+ return NULL;
+}
+
+static int rproc_pre_probe(struct udevice *dev)
+{
+ struct dm_rproc_uclass_pdata *uc_pdata;
+ const struct dm_rproc_ops *ops;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata) {
+ debug("%s: no uclass_platdata?\n", dev->name);
+ return -ENXIO;
+ }
+
+ /* See if we need to populate via fdt */
+
+ if (!dev->platdata) {
+#ifdef CONFIG_OF_CONTROL
+ int node = dev->of_offset;
+ const void *blob = gd->fdt_blob;
+ bool tmp;
+ if (!blob) {
+ debug("'%s' no dt?\n", dev->name);
+ return -EINVAL;
+ }
+ debug("'%s': using fdt\n", dev->name);
+ uc_pdata->name = fdt_getprop(blob, node,
+ "remoteproc-name", NULL);
+
+ /* Default is internal memory mapped */
+ uc_pdata->mem_type = RPROC_INTERNAL_MEMORY_MAPPED;
+ tmp = fdtdec_get_bool(blob, node,
+ "remoteproc-internal-memory-mapped");
+ if (tmp)
+ uc_pdata->mem_type = RPROC_INTERNAL_MEMORY_MAPPED;
+#else
+ /* Nothing much we can do about this, can we? */
+ return -EINVAL;
+#endif
+
+ } else {
+ struct dm_rproc_uclass_pdata *pdata = dev->platdata;
+
+ debug("'%s': using legacy data\n", dev->name);
+ if (pdata->name)
+ uc_pdata->name = pdata->name;
+ uc_pdata->mem_type = pdata->mem_type;
+ uc_pdata->driver_plat_data = pdata->driver_plat_data;
+ }
+
+ /* Else try using device Name */
+ if (!uc_pdata->name)
+ uc_pdata->name = dev->name;
+ if (!uc_pdata->name) {
+ debug("Unnamed device!");
+ return -EINVAL;
+ }
+
+ if (!rproc_name_is_unique(dev, uc_pdata->name)) {
+ debug("%s duplicate name '%s'\n", dev->name, uc_pdata->name);
+ return -EINVAL;
+ }
+
+ ops = device_get_ops(dev);
+ if (!ops) {
+ debug("%s driver has no ops?\n", dev->name);
+ return -EINVAL;
+ }
+
+ if (!ops->load || !ops->start) {
+ debug("%s driver has missing mandatory ops?\n", dev->name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rproc_post_probe(struct udevice *dev)
+{
+ struct dm_rproc_uclass_pdata *uc_pdata;
+ const struct dm_rproc_ops *ops;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata) {
+ debug("%s: no uclass_platdata?\n", dev->name);
+ return -ENXIO;
+ }
+
+ ops = device_get_ops(dev);
+ if (!ops) {
+ debug("%s driver has no ops?\n", dev->name);
+ return -EINVAL;
+ }
+
+ if (ops->init)
+ return ops->init(dev);
+
+ return 0;
+}
+
+UCLASS_DRIVER(rproc) = {
+ /* *INDENT-OFF* */
+ .id = UCLASS_RPROC,
+ .name = "remoteproc",
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
+ .pre_probe = rproc_pre_probe,
+ .post_probe = rproc_post_probe,
+ .per_device_platdata_auto_alloc_size =
+ sizeof(struct dm_rproc_uclass_pdata),
+ /* *INDENT-ON* */
+};
+
+/* exported functions */
+static int _rproc_probe_dev(struct udevice *dev,
+ struct dm_rproc_uclass_pdata *uc_pdata,
+ const void *data)
+{
+ int ret;
+
+ ret = device_probe(dev);
+
+ if (ret)
+ printf("%s: Failed to initialize - %d\n", dev->name, ret);
+ return ret;
+}
+
+static bool _rproc_init_called;
+
+/**
+ * rproc_init() - Initialize all bound remote proc devices
+ */
+int rproc_init(void)
+{
+ int ret;
+
+ if (_rproc_init_called) {
+ debug("Already initialized\n");
+ return -EINVAL;
+ }
+
+ ret = for_each_remoteproc_device(_rproc_probe_dev, NULL, NULL);
+ if (!ret)
+ _rproc_init_called = true;
+ return ret;
+}
+
+/**
+ * rproc_is_initialized() - check to see if remoteproc devices are initialized
+ */
+int rproc_is_initialized(void)
+{
+ return _rproc_init_called;
+}
+
+/**
+ * rproc_load() - load binary to a remote processor
+ * @id: id of the remote processor
+ * @addr: address in memory where the binary image is located
+ * @size: size of the binary image
+ */
+int rproc_load(int id, ulong addr, ulong size)
+{
+ struct udevice *dev = rproc_find_dev_for_id(id);
+ struct dm_rproc_uclass_pdata *uc_pdata;
+ const struct dm_rproc_ops *ops;
+
+ if (!dev) {
+ printf("Unknown remote processor id '%d' requested\n", id);
+ return -EINVAL;
+ }
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata) {
+ debug("%s: no uclass_platdata?\n", dev->name);
+ return -ENXIO;
+ }
+
+ ops = device_get_ops(dev);
+ if (!ops) {
+ debug("%s driver has no ops?\n", dev->name);
+ return -EINVAL;
+ }
+
+ printf("Loading to '%s' from address 0x%08lX size of %lu bytes\n",
+ uc_pdata->name, addr, size);
+ if (ops->load)
+ return ops->load(dev, addr, size);
+
+ debug("%s: data corruption?? mandatory function is missing!\n",
+ dev->name);
+
+ return -EINVAL;
+};
+
+/*
+ * Completely internal helper enums..
+ * Keeping this isolated helps this code evolve independent of other
+ * parts..
+ */
+enum rproc_ops {
+ RPROC_START,
+ RPROC_STOP,
+ RPROC_RESET,
+ RPROC_PING,
+ RPROC_RUNNING,
+};
+
+static int _rproc_wrapper(int id, enum rproc_ops op)
+{
+ struct udevice *dev = rproc_find_dev_for_id(id);
+ struct dm_rproc_uclass_pdata *uc_pdata;
+ const struct dm_rproc_ops *ops;
+ int (*fn)(struct udevice *dev);
+ bool mandatory = false;
+ char *op_str;
+
+ if (!dev) {
+ printf("Unknown remote processor id '%d' requested\n", id);
+ return -EINVAL;
+ }
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+ if (!uc_pdata) {
+ debug("%s: no uclass_platdata?\n", dev->name);
+ return -ENXIO;
+ }
+
+ ops = device_get_ops(dev);
+ if (!ops) {
+ debug("%s driver has no ops?\n", dev->name);
+ return -EINVAL;
+ }
+ switch (op) {
+ case RPROC_START:
+ fn = ops->start;
+ mandatory = true;
+ op_str = "Starting";
+ break;
+ case RPROC_STOP:
+ fn = ops->stop;
+ op_str = "Stopping";
+ break;
+ case RPROC_RESET:
+ fn = ops->reset;
+ op_str = "Resetting";
+ break;
+ case RPROC_RUNNING:
+ fn = ops->is_running;
+ op_str = "Checking if running:";
+ break;
+ case RPROC_PING:
+ fn = ops->ping;
+ op_str = "Pinging";
+ break;
+ default:
+ debug("what is '%d' operation??\n", op);
+ return -EINVAL;
+ }
+
+ printf("%s %s...\n", op_str, uc_pdata->name);
+ if (fn)
+ return fn(dev);
+
+ if (mandatory)
+ debug("%s: data corruption?? mandatory function is missing!\n",
+ dev->name);
+
+ return -EINVAL;
+}
+
+/**
+ * rproc_start() - Start a remote processor
+ * @id: id of the remote processor
+ */
+int rproc_start(int id)
+{
+ return _rproc_wrapper(id, RPROC_START);
+};
+
+/**
+ * rproc_stop() - Stop a remote processor
+ * @id: id of the remote processor
+ */
+int rproc_stop(int id)
+{
+ return _rproc_wrapper(id, RPROC_STOP);
+};
+
+/**
+ * rproc_reset() - reset a remote processor
+ * @id: id of the remote processor
+ */
+int rproc_reset(int id)
+{
+ return _rproc_wrapper(id, RPROC_RESET);
+};
+
+/**
+ * rproc_ping() - ping a remote processor to check if it can communicate
+ * @id: id of the remote processor
+ *
+ * NOTE: this might need communication path available, which is not implemented
+ * as part of remoteproc framework - hook on to appropriate bus architecture to
+ * do the same
+ */
+int rproc_ping(int id)
+{
+ return _rproc_wrapper(id, RPROC_PING);
+};
+
+/**
+ * rproc_is_running() - check to see if remote processor is running
+ * @id: id of the remote processor
+ *
+ * NOTE: this may not involve actual communication capability of the remote
+ * processor, but just ensures that it is out of reset and executing code.
+ */
+int rproc_is_running(int id)
+{
+ return _rproc_wrapper(id, RPROC_RUNNING);
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index c744044bb8aa..a2958c234db4 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -47,6 +47,7 @@ enum uclass_id {
UCLASS_PMIC, /* PMIC I/O device */
UCLASS_REGULATOR, /* Regulator device */
UCLASS_RESET, /* Reset device */
+ UCLASS_RPROC, /* Remote Processor device */
UCLASS_RTC, /* Real time clock device */
UCLASS_SERIAL, /* Serial UART */
UCLASS_SPI, /* SPI bus */
diff --git a/include/remoteproc.h b/include/remoteproc.h
new file mode 100644
index 000000000000..b92d40e0ca2e
--- /dev/null
+++ b/include/remoteproc.h
@@ -0,0 +1,81 @@
+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated - http://www.ti.com/
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _RPROC_H_
+#define _RPROC_H_
+
+#include <dm/platdata.h> /* For platform data support - non dt world */
+
+/**
+ * enum rproc_mem_type - What type of memory model does the rproc use
+ * @RPROC_INTERNAL: Remote processor uses own memory and is memory mapped
+ * to the host processor over an address range.
+ *
+ * Please note that this is an enumeration of memory model of different types
+ * of remote processors. Few of the remote processors do have own internal
+ * memories, while others use external memory for instruction and data.
+ */
+enum rproc_mem_type {
+ RPROC_INTERNAL_MEMORY_MAPPED = 0,
+};
+
+/**
+ * struct dm_rproc_uclass_pdata - platform data for a CPU
+ *
+ * This can be accessed with dev_get_platdata() for any UCLASS_RPROC
+ * device.
+ *
+ * @name: Platform-specific way of naming the Remote proc
+ * @mem_type: one of 'enum rproc_mem_type'
+ * @driver_data: driver specific platform data that may be needed.
+ */
+struct dm_rproc_uclass_pdata {
+ const char *name;
+ enum rproc_mem_type mem_type;
+ void *driver_plat_data;
+};
+
+/**
+ * struct dm_rproc_ops - Operations that are provided by remote proc driver
+ * @init: Initialize the remoteproc device invoked after probe (optional)
+ * @load: Load the remoteproc device using data provided(mandatory)
+ * @start: Start the remoteproc device (mandatory)
+ * @stop: Stop the remoteproc device (optional)
+ * @reset: Reset the remote proc device (optional)
+ * @is_running: Check if the remote processor is running(optional)
+ * @ping: Ping the remote device for basic communication check(optional)
+ */
+struct dm_rproc_ops {
+ int (*init)(struct udevice *dev);
+ int (*load)(struct udevice *dev, ulong addr, ulong size);
+ int (*start)(struct udevice *dev);
+ int (*stop)(struct udevice *dev);
+ int (*reset)(struct udevice *dev);
+ int (*is_running)(struct udevice *dev);
+ int (*ping)(struct udevice *dev);
+};
+
+#ifdef CONFIG_DM_REMOTEPROC
+int rproc_init(void);
+int rproc_is_initialized(void);
+int rproc_load(int id, ulong addr, ulong size);
+int rproc_start(int id);
+int rproc_stop(int id);
+int rproc_reset(int id);
+int rproc_ping(int id);
+int rproc_is_running(int id);
+#else
+static inline int rproc_init(void) { return -EINVAL; }
+static inline int rproc_is_initialized(void) { return false; }
+static inline int rproc_load(int id, ulong addr, ulong size) { return -EINVAL; }
+static inline int rproc_start(int id) { return -EINVAL; }
+static inline int rproc_stop(int id) { return -EINVAL; }
+static inline int rproc_reset(int id) { return -EINVAL; }
+static inline int rproc_ping(int id) { return -EINVAL; }
+static inline int rproc_is_running(int id) { return -EINVAL; }
+#endif
+
+#endif /* _RPROC_H_ */
--
2.1.4
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