---
drivers/remoteproc/Kconfig | 13 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/ti_k3_m4_remoteproc.c | 667 +++++++++++++++++++++++
3 files changed, 681 insertions(+)
create mode 100644 drivers/remoteproc/ti_k3_m4_remoteproc.c
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index dda2ada215b7c..0f0862e20a932 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -340,6 +340,19 @@ config TI_K3_DSP_REMOTEPROC
It's safe to say N here if you're not interested in utilizing
the DSP slave processors.
+config TI_K3_M4_REMOTEPROC
+ tristate "TI K3 M4 remoteproc support"
+ depends on ARCH_K3 || COMPILE_TEST
+ select MAILBOX
+ select OMAP2PLUS_MBOX
+ help
+ Say m here to support TI's M4 remote processor subsystems
+ on various TI K3 family of SoCs through the remote processor
+ framework.
+
+ It's safe to say N here if you're not interested in utilizing
+ a remote processor.
+
config TI_K3_R5_REMOTEPROC
tristate "TI K3 R5 remoteproc support"
depends on ARCH_K3
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 91314a9b43cef..5ff4e2fee4abd 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -37,5 +37,6 @@ obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
+obj-$(CONFIG_TI_K3_M4_REMOTEPROC) += ti_k3_m4_remoteproc.o
obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o
obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o
diff --git a/drivers/remoteproc/ti_k3_m4_remoteproc.c b/drivers/remoteproc/ti_k3_m4_remoteproc.c
new file mode 100644
index 0000000000000..09f0484a90e10
--- /dev/null
+++ b/drivers/remoteproc/ti_k3_m4_remoteproc.c
@@ -0,0 +1,667 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TI K3 Cortex-M4 Remote Processor(s) driver
+ *
+ * Copyright (C) 2021-2024 Texas Instruments Incorporated - https://www.ti.com/
+ * Hari Nagalla <hnagalla@xxxxxx>
+ */
+
+#include <linux/io.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+
+#include "omap_remoteproc.h"
+#include "remoteproc_internal.h"
+#include "ti_sci_proc.h"
+
+#define K3_M4_IRAM_DEV_ADDR 0x00000
+#define K3_M4_DRAM_DEV_ADDR 0x30000
+
+/**
+ * struct k3_m4_rproc_mem - internal memory structure
+ * @cpu_addr: MPU virtual address of the memory region
+ * @bus_addr: Bus address used to access the memory region
+ * @dev_addr: Device address of the memory region from remote processor view
+ * @size: Size of the memory region
+ */
+struct k3_m4_rproc_mem {
+ void __iomem *cpu_addr;
+ phys_addr_t bus_addr;
+ u32 dev_addr;
+ size_t size;
+};
+
+/**
+ * struct k3_m4_rproc_mem_data - memory definitions for a remote processor
+ * @name: name for this memory entry
+ * @dev_addr: device address for the memory entry
+ */
+struct k3_m4_rproc_mem_data {
+ const char *name;
+ const u32 dev_addr;
+};
+
+/**
+ * struct k3_m4_rproc - k3 remote processor driver structure
+ * @dev: cached device pointer
+ * @mem: internal memory regions data
+ * @num_mems: number of internal memory regions
+ * @rmem: reserved memory regions data
+ * @num_rmems: number of reserved memory regions
+ * @reset: reset control handle
+ * @tsp: TI-SCI processor control handle
+ * @ti_sci: TI-SCI handle
+ * @ti_sci_id: TI-SCI device identifier
+ * @mbox: mailbox channel handle
+ * @client: mailbox client to request the mailbox channel
+ */
+struct k3_m4_rproc {
+ struct device *dev;
+ struct k3_m4_rproc_mem *mem;
+ int num_mems;
+ struct k3_m4_rproc_mem *rmem;
+ int num_rmems;
+ struct reset_control *reset;
+ struct ti_sci_proc *tsp;
+ const struct ti_sci_handle *ti_sci;
+ u32 ti_sci_id;
+ struct mbox_chan *mbox;
+ struct mbox_client client;
+};
+
+/**
+ * k3_m4_rproc_mbox_callback() - inbound mailbox message handler
+ * @client: mailbox client pointer used for requesting the mailbox channel
+ * @data: mailbox payload
+ *
+ * This handler is invoked by the K3 mailbox driver whenever a mailbox
+ * message is received. Usually, the mailbox payload simply contains
+ * the index of the virtqueue that is kicked by the remote processor,
+ * and we let remoteproc core handle it.
+ *
+ * In addition to virtqueue indices, we also have some out-of-band values
+ * that indicate different events. Those values are deliberately very
+ * large so they don't coincide with virtqueue indices.
+ */
+static void k3_m4_rproc_mbox_callback(struct mbox_client *client, void *data)
+{
+ struct device *dev = client->dev;
+ struct rproc *rproc = dev_get_drvdata(dev);
+ u32 msg = (u32)(uintptr_t)(data);
+
+ dev_dbg(dev, "mbox msg: 0x%x\n", msg);
+
+ switch (msg) {
+ case RP_MBOX_CRASH:
+ /*
+ * remoteproc detected an exception, but error recovery is not
+ * supported. So, just log this for now
+ */
+ dev_err(dev, "K3 rproc %s crashed\n", rproc->name);
+ break;
+ case RP_MBOX_ECHO_REPLY:
+ dev_info(dev, "received echo reply from %s\n", rproc->name);
+ break;
+ default:
+ /* silently handle all other valid messages */
+ if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
+ return;
+ if (msg > rproc->max_notifyid) {
+ dev_dbg(dev, "dropping unknown message 0x%x", msg);
+ return;
+ }
+ /* msg contains the index of the triggered vring */
+ if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
+ dev_dbg(dev, "no message was found in vqid %d\n", msg);
+ }
+}
+
+/*
+ * Kick the remote processor to notify about pending unprocessed messages.
+ * The vqid usage is not used and is inconsequential, as the kick is performed
+ * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
+ * the remote processor is expected to process both its Tx and Rx virtqueues.
+ */
+static void k3_m4_rproc_kick(struct rproc *rproc, int vqid)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ struct device *dev = kproc->dev;
+ u32 msg = (u32)vqid;
+ int ret;
+
+ /*
+ * Send the index of the triggered virtqueue in the mailbox payload.
+ * NOTE: msg is cast to uintptr_t to prevent compiler warnings when
+ * void* is 64bit. It is safely cast back to u32 in the mailbox driver.
+ */
+ ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);
+ if (ret < 0)
+ dev_err(dev, "failed to send mailbox message, status = %d\n",
+ ret);
+}
+
+static int k3_m4_rproc_ping_mbox(struct k3_m4_rproc *kproc)
+{
+ struct device *dev = kproc->dev;
+ int ret;
+
+ /*
+ * Ping the remote processor, this is only for sanity-sake for now;
+ * there is no functional effect whatsoever.
+ *
+ * Note that the reply will _not_ arrive immediately: this message
+ * will wait in the mailbox fifo until the remote processor is booted.
+ */
+ ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
+ if (ret < 0) {
+ dev_err(dev, "mbox_send_message failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * The M4 cores have a local reset that affects only the CPU, and a
+ * generic module reset that powers on the device and allows the internal
+ * memories to be accessed while the local reset is asserted. This function is
+ * used to release the global reset on remote cores to allow loading into the
+ * internal RAMs. The .prepare() ops is invoked by remoteproc core before any
+ * firmware loading, and is followed by the .start() ops after loading to
+ * actually let the remote cores to run.
+ */
+static int k3_m4_rproc_prepare(struct rproc *rproc)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ struct device *dev = kproc->dev;
+ int ret;
+
+ /* If the core is running already no need to deassert the module reset */
+ if (rproc->state == RPROC_DETACHED)
+ return 0;
+
+ /*
+ * Ensure the local reset is asserted so the core doesn't
+ * execute bogus code when the module reset is released.
+ */
+ ret = reset_control_assert(kproc->reset);
+ if (ret) {
+ dev_err(dev, "could not assert local reset\n");
+ return ret;
+ }
+
+ ret = reset_control_status(kproc->reset);
+ if (ret <= 0) {
+ dev_err(dev, "local reset still not asserted\n");
+ return ret;
+ }
+
+ ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
+ kproc->ti_sci_id);
+ if (ret) {
+ dev_err(dev, "could not deassert module-reset for internal RAM loading\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * This function implements the .unprepare() ops and performs the complimentary
+ * operations to that of the .prepare() ops. The function is used to assert the
+ * global reset on applicable cores. This completes the second portion of
+ * powering down the remote core. The cores themselves are only halted in the
+ * .stop() callback through the local reset, and the .unprepare() ops is invoked
+ * by the remoteproc core after the remoteproc is stopped to balance the global
+ * reset.
+ */
+static int k3_m4_rproc_unprepare(struct rproc *rproc)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ struct device *dev = kproc->dev;
+ int ret;
+
+ /* If the core is going to be detached do not assert the module reset */
+ if (rproc->state == RPROC_ATTACHED)
+ return 0;
+
+ ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
+ kproc->ti_sci_id);
+ if (ret) {
+ dev_err(dev, "module-reset assert failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * This function implements the .get_loaded_rsc_table() callback and is used
+ * to provide the resource table for a booted remote processor in IPC-only
+ * mode. The remote processor firmwares follow a design-by-contract approach
+ * and are expected to have the resource table at the base of the DDR region
+ * reserved for firmware usage. This provides flexibility for the remote
+ * processor to be booted by different bootloaders that may or may not have the
+ * ability to publish the resource table address and size through a DT
+ * property.
+ */
+static struct resource_table *k3_m4_get_loaded_rsc_table(struct rproc *rproc,
+ size_t *rsc_table_sz)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ struct device *dev = kproc->dev;
+
+ if (!kproc->rmem[0].cpu_addr) {
+ dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ /*
+ * NOTE: The resource table size is currently hard-coded to a maximum
+ * of 256 bytes. The most common resource table usage for K3 firmwares
+ * is to only have the vdev resource entry and an optional trace entry.
+ * The exact size could be computed based on resource table address, but
+ * the hard-coded value suffices to support the IPC-only mode.
+ */
+ *rsc_table_sz = 256;
+ return (__force struct resource_table *)kproc->rmem[0].cpu_addr;
+}
+
+/*
+ * Custom function to translate a remote processor device address (internal
+ * RAMs only) to a kernel virtual address. The remote processors can access
+ * their RAMs at either an internal address visible only from a remote
+ * processor, or at the SoC-level bus address. Both these addresses need to be
+ * looked through for translation. The translated addresses can be used either
+ * by the remoteproc core for loading (when using kernel remoteproc loader), or
+ * by any rpmsg bus drivers.
+ */
+static void *k3_m4_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ void __iomem *va = NULL;
+ phys_addr_t bus_addr;
+ u32 dev_addr, offset;
+ size_t size;
+ int i;
+
+ if (len == 0)
+ return NULL;
+
+ for (i = 0; i < kproc->num_mems; i++) {
+ bus_addr = kproc->mem[i].bus_addr;
+ dev_addr = kproc->mem[i].dev_addr;
+ size = kproc->mem[i].size;
+
+ /* handle M4-view addresses */
+ if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
+ offset = da - dev_addr;
+ va = kproc->mem[i].cpu_addr + offset;
+ return (__force void *)va;
+ }
+
+ /* handle SoC-view addresses */
+ if (da >= bus_addr && ((da + len) <= (bus_addr + size))) {
+ offset = da - bus_addr;
+ va = kproc->mem[i].cpu_addr + offset;
+ return (__force void *)va;
+ }
+ }
+
+ /* handle static DDR reserved memory regions */
+ for (i = 0; i < kproc->num_rmems; i++) {
+ dev_addr = kproc->rmem[i].dev_addr;
+ size = kproc->rmem[i].size;
+
+ if (da >= dev_addr && ((da + len) <= (dev_addr + size))) {
+ offset = da - dev_addr;
+ va = kproc->rmem[i].cpu_addr + offset;
+ return (__force void *)va;
+ }
+ }
+
+ return NULL;
+}
+
+static int k3_m4_rproc_of_get_memories(struct platform_device *pdev,
+ struct k3_m4_rproc *kproc)
+{
+ static const char * const mem_names[] = { "iram", "dram" };
+ static const u32 mem_addrs[] = { K3_M4_IRAM_DEV_ADDR, K3_M4_DRAM_DEV_ADDR };
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int num_mems;
+ int i;
+
+ num_mems = ARRAY_SIZE(mem_names);
+ kproc->mem = devm_kcalloc(kproc->dev, num_mems,
+ sizeof(*kproc->mem), GFP_KERNEL);
+ if (!kproc->mem)
+ return -ENOMEM;
+
+ for (i = 0; i < num_mems; i++) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ mem_names[i]);
+ if (!res) {
+ dev_err(dev, "found no memory resource for %s\n",
+ mem_names[i]);
+ return -EINVAL;
+ }
+ if (!devm_request_mem_region(dev, res->start,
+ resource_size(res),
+ dev_name(dev))) {
+ dev_err(dev, "could not request %s region for resource\n",
+ mem_names[i]);
+ return -EBUSY;
+ }
+
+ kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
+ resource_size(res));
+ if (!kproc->mem[i].cpu_addr) {
+ dev_err(dev, "failed to map %s memory\n",
+ mem_names[i]);
+ return -ENOMEM;
+ }
+ kproc->mem[i].bus_addr = res->start;
+ kproc->mem[i].dev_addr = mem_addrs[i];
+ kproc->mem[i].size = resource_size(res);
+
+ dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
+ mem_names[i], &kproc->mem[i].bus_addr,
+ kproc->mem[i].size, kproc->mem[i].cpu_addr,
+ kproc->mem[i].dev_addr);
+ }
+ kproc->num_mems = num_mems;
+
+ return 0;
+}
+
+static void k3_m4_rproc_dev_mem_release(void *data)
+{
+ struct device *dev = data;
+
+ of_reserved_mem_device_release(dev);
+}
+
+static int k3_m4_reserved_mem_init(struct k3_m4_rproc *kproc)
+{
+ struct device *dev = kproc->dev;
+ struct device_node *np = dev->of_node;
+ struct device_node *rmem_np;
+ struct reserved_mem *rmem;
+ int num_rmems;
+ int ret, i;
+
+ num_rmems = of_property_count_elems_of_size(np, "memory-region",
+ sizeof(phandle));
+ if (num_rmems < 0) {
+ dev_err(dev, "device does not reserved memory regions (%d)\n",
+ num_rmems);
+ return -EINVAL;
+ }
+ if (num_rmems < 2) {
+ dev_err(dev, "device needs at least two memory regions to be defined, num = %d\n",
+ num_rmems);
+ return -EINVAL;
+ }
+
+ /* use reserved memory region 0 for vring DMA allocations */
+ ret = of_reserved_mem_device_init_by_idx(dev, np, 0);
+ if (ret) {
+ dev_err(dev, "device cannot initialize DMA pool (%d)\n", ret);
+ return ret;
+ }
+ ret = devm_add_action_or_reset(dev, k3_m4_rproc_dev_mem_release, dev);
+ if (ret)
+ return ret;
+
+ num_rmems--;
+ kproc->rmem = devm_kcalloc(dev, num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
+ if (!kproc->rmem)
+ return -ENOMEM;
+
+ /* use remaining reserved memory regions for static carveouts */
+ for (i = 0; i < num_rmems; i++) {
+ rmem_np = of_parse_phandle(np, "memory-region", i + 1);
+ if (!rmem_np)
+ return -EINVAL;
+
+ rmem = of_reserved_mem_lookup(rmem_np);
+ if (!rmem) {
+ of_node_put(rmem_np);
+ return -EINVAL;
+ }
+ of_node_put(rmem_np);
+
+ kproc->rmem[i].bus_addr = rmem->base;
+ /* 64-bit address regions currently not supported */
+ kproc->rmem[i].dev_addr = (u32)rmem->base;
+ kproc->rmem[i].size = rmem->size;
+ kproc->rmem[i].cpu_addr = devm_ioremap_wc(dev, rmem->base, rmem->size);
+ if (!kproc->rmem[i].cpu_addr) {
+ dev_err(dev, "failed to map reserved memory#%d at %pa of size %pa\n",
+ i + 1, &rmem->base, &rmem->size);
+ return -ENOMEM;
+ }
+
+ dev_dbg(dev, "reserved memory%d: bus addr %pa size 0x%zx va %pK da 0x%x\n",
+ i + 1, &kproc->rmem[i].bus_addr,
+ kproc->rmem[i].size, kproc->rmem[i].cpu_addr,
+ kproc->rmem[i].dev_addr);
+ }
+ kproc->num_rmems = num_rmems;
+
+ return 0;
+}
+
+static void k3_m4_release_tsp(void *data)
+{
+ struct ti_sci_proc *tsp = data;
+
+ ti_sci_proc_release(tsp);
+}
+
+/*
+ * Power up the M4 remote processor.
+ *
+ * This function will be invoked only after the firmware for this rproc
+ * was loaded, parsed successfully, and all of its resource requirements
+ * were met. This callback is invoked only in remoteproc mode.
+ */
+static int k3_m4_rproc_start(struct rproc *rproc)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ struct device *dev = kproc->dev;
+ int ret;
+
+ ret = k3_m4_rproc_ping_mbox(kproc);
+ if (ret)
+ return ret;
+
+ ret = reset_control_deassert(kproc->reset);
+ if (ret) {
+ dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Stop the M4 remote processor.
+ *
+ * This function puts the M4 processor into reset, and finishes processing
+ * of any pending messages. This callback is invoked only in remoteproc mode.
+ */
+static int k3_m4_rproc_stop(struct rproc *rproc)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ struct device *dev = kproc->dev;
+ int ret;
+
+ ret = reset_control_assert(kproc->reset);
+ if (ret) {
+ dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Attach to a running M4 remote processor (IPC-only mode)
+ *
+ * The remote processor is already booted, so there is no need to issue any
+ * TI-SCI commands to boot the M4 core. This callback is used only in IPC-only
+ * mode.
+ */
+static int k3_m4_rproc_attach(struct rproc *rproc)
+{
+ struct k3_m4_rproc *kproc = rproc->priv;
+ int ret;
+
+ ret = k3_m4_rproc_ping_mbox(kproc);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/*
+ * Detach from a running M4 remote processor (IPC-only mode)
+ *
+ * This rproc detach callback performs the opposite operation to attach
+ * callback, the M4 core is not stopped and will be left to continue to
+ * run its booted firmware. This callback is invoked only in IPC-only mode.
+ */
+static int k3_m4_rproc_detach(struct rproc *rproc)
+{
+ return 0;
+}
+
+static const struct rproc_ops k3_m4_rproc_ops = {
+ .prepare = k3_m4_rproc_prepare,
+ .unprepare = k3_m4_rproc_unprepare,
+ .start = k3_m4_rproc_start,
+ .stop = k3_m4_rproc_stop,
+ .attach = k3_m4_rproc_attach,
+ .detach = k3_m4_rproc_detach,
+ .kick = k3_m4_rproc_kick,
+ .da_to_va = k3_m4_rproc_da_to_va,
+ .get_loaded_rsc_table = k3_m4_get_loaded_rsc_table,
+};
+
+static int k3_m4_rproc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct k3_m4_rproc *kproc;
+ struct rproc *rproc;
+ const char *fw_name;
+ bool r_state = false;
+ bool p_state = false;
+ int ret;
+
+ ret = rproc_of_parse_firmware(dev, 0, &fw_name);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to parse firmware-name property\n");
+
+ rproc = devm_rproc_alloc(dev, dev_name(dev), &k3_m4_rproc_ops, fw_name,
+ sizeof(*kproc));
+ if (!rproc)
+ return -ENOMEM;
+
+ rproc->has_iommu = false;
+ rproc->recovery_disabled = true;
+ kproc = rproc->priv;
+ kproc->dev = dev;
+ platform_set_drvdata(pdev, rproc);
+
+ kproc->ti_sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
+ if (IS_ERR(kproc->ti_sci))
+ return dev_err_probe(dev, PTR_ERR(kproc->ti_sci),
+ "failed to get ti-sci handle\n");
+
+ ret = of_property_read_u32(dev->of_node, "ti,sci-dev-id", &kproc->ti_sci_id);
+ if (ret)
+ return dev_err_probe(dev, ret, "missing 'ti,sci-dev-id' property\n");
+
+ kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(kproc->reset))
+ return dev_err_probe(dev, PTR_ERR(kproc->reset), "failed to get reset\n");
+
+ kproc->tsp = ti_sci_proc_of_get_tsp(dev, kproc->ti_sci);
+ if (IS_ERR(kproc->tsp))
+ return dev_err_probe(dev, PTR_ERR(kproc->tsp),
+ "failed to construct ti-sci proc control\n");
+
+ ret = ti_sci_proc_request(kproc->tsp);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "ti_sci_proc_request failed\n");
+ ret = devm_add_action_or_reset(dev, k3_m4_release_tsp, kproc->tsp);
+ if (ret)
+ return ret;
+
+ ret = k3_m4_rproc_of_get_memories(pdev, kproc);
+ if (ret)
+ return ret;
+
+ ret = k3_m4_reserved_mem_init(kproc);
+ if (ret)
+ return dev_err_probe(dev, ret, "reserved memory init failed\n");
+
+ ret = kproc->ti_sci->ops.dev_ops.is_on(kproc->ti_sci, kproc->ti_sci_id,
+ &r_state, &p_state);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to get initial state, mode cannot be determined\n");
+
+ /* configure devices for either remoteproc or IPC-only mode */
+ if (p_state) {
+ rproc->state = RPROC_DETACHED;
+ dev_info(dev, "configured M4F for IPC-only mode\n");
+ } else {
+ dev_info(dev, "configured M4F for remoteproc mode\n");
+ }
+
+ kproc->client.dev = dev;
+ kproc->client.tx_done = NULL;
+ kproc->client.rx_callback = k3_m4_rproc_mbox_callback;
+ kproc->client.tx_block = false;
+ kproc->client.knows_txdone = false;
+ kproc->mbox = mbox_request_channel(&kproc->client, 0);
+ if (IS_ERR(kproc->mbox))
+ return dev_err_probe(dev, PTR_ERR(kproc->mbox),
+ "mbox_request_channel failed\n");
+
+ ret = devm_rproc_add(dev, rproc);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "failed to register device with remoteproc core\n");
+
+ return 0;
+}
+
+static const struct of_device_id k3_m4_of_match[] = {
+ { .compatible = "ti,am64-m4fss", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, k3_m4_of_match);
+
+static struct platform_driver k3_m4_rproc_driver = {
+ .probe = k3_m4_rproc_probe,
+ .driver = {
+ .name = "k3-m4-rproc",
+ .of_match_table = k3_m4_of_match,
+ },
+};
+module_platform_driver(k3_m4_rproc_driver);
+
+MODULE_AUTHOR("Hari Nagalla <hnagalla@xxxxxx>");
+MODULE_DESCRIPTION("TI K3 M4 Remoteproc driver");
+MODULE_LICENSE("GPL");
