Message-ID: <20200427225737.GB10552@xps15>
Date:   Mon, 27 Apr 2020 16:57:37 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lokesh Vutla <lokeshvutla@...com>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] remoteproc/k3-dsp: Add a remoteproc driver of K3
 C66x DSPs

On Wed, Mar 25, 2020 at 03:18:38PM -0500, Suman Anna wrote:
> The Texas Instrument's K3 J721E SoCs have two C66x DSP Subsystems in MAIN
> voltage domain that are based on the TI's standard TMS320C66x DSP CorePac
> module. Each subsystem has a Fixed/Floating-Point DSP CPU, with 32 KB each
> of L1P & L1D SRAMs that can be configured and partitioned as either RAM
> and/or Cache, and 288 KB of L2 SRAM with 256 KB of memory configurable as
> either RAM and/or Cache. The CorePac also includes an Internal DMA (IDMA),
> External Memory Controller (EMC), Extended Memory Controller (XMC) with a
> Region Address Translator (RAT) unit for 32-bit to 48-bit address
> extension/translations, an Interrupt Controller (INTC) and a Powerdown
> Controller (PDC).
> 
> A new remoteproc module is added to perform the device management of
> these DSP devices. The support is limited to images using only external
> DDR memory at the moment, the loading support to internal memories and
> any on-chip RAM memories will be added in a subsequent patch. RAT support
> is also left for a future patch, and as such the reserved memory carveout
> regions are all expected to be using memory regions within the first 2 GB.
> Error Recovery and Power Management features are not currently supported.
> 
> The C66x remote processors do not have an MMU, and so require fixed memory
> carveout regions matching the firmware image addresses. Support for this
> is provided by mandating multiple memory regions to be attached to the
> remoteproc device. The first memory region will be used to serve as the
> DMA pool for all dynamic allocations like the vrings and vring buffers.
> The remaining memory regions are mapped into the kernel at device probe
> time, and are used to provide address translations for firmware image
> segments without the need for any RSC_CARVEOUT entries. Any firmware
> image using memory outside of the supplied reserved memory carveout
> regions will be errored out.
> 
> The driver uses various TI-SCI interfaces to talk to the System Controller
> (DMSC) for managing configuration, power and reset management of these
> cores. IPC between the A72 cores and the DSP cores is supported through
> the virtio rpmsg stack using shared memory and OMAP Mailboxes.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> ---
>  drivers/remoteproc/Kconfig                |  16 +
>  drivers/remoteproc/Makefile               |   1 +
>  drivers/remoteproc/ti_k3_dsp_remoteproc.c | 736 ++++++++++++++++++++++
>  3 files changed, 753 insertions(+)
>  create mode 100644 drivers/remoteproc/ti_k3_dsp_remoteproc.c
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 073048b4c0fb..66a76acb15b6 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -240,6 +240,22 @@ config TI_K3_R5_REMOTEPROC
>  	  It's safe to say N here if you're not interested in utilizing
>  	  a slave processor
>  
> +config TI_K3_DSP_REMOTEPROC
> +	tristate "TI K3 DSP remoteproc support"
> +	depends on ARCH_K3
> +	select MAILBOX
> +	select OMAP2PLUS_MBOX
> +	help
> +	  Say y here to support TI's C66x and C71x DSP remote processor
> +	  subsystems on various TI K3 family of SoCs through the remote
> +	  processor framework.
> +
> +	  You want to say m here in order to offload some processing
> +	  tasks to these processors.

Building this driver has a module, i.e 'm', has nothing to do with what the
remote processor does.  I would simply remove the above 2 lines.

> +
> +	  It's safe to say N here if you're not interested in utilizing
> +	  the DSP slave processors.
> +
>  endif # REMOTEPROC
>  
>  endmenu
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 00ba826818af..eb51cc09e47b 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -29,3 +29,4 @@ 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_R5_REMOTEPROC)	+= ti_k3_r5_remoteproc.o
> +obj-$(CONFIG_TI_K3_DSP_REMOTEPROC)	+= ti_k3_dsp_remoteproc.o
> diff --git a/drivers/remoteproc/ti_k3_dsp_remoteproc.c b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> new file mode 100644
> index 000000000000..fd0d84f46f90
> --- /dev/null
> +++ b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> @@ -0,0 +1,736 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * TI K3 DSP Remote Processor(s) driver
> + *
> + * Copyright (C) 2018-2020 Texas Instruments Incorporated - http://www.ti.com/
> + *	Suman Anna <s-anna@...com>
> + */
> +
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/remoteproc.h>
> +#include <linux/mailbox_client.h>
> +#include <linux/omap-mailbox.h>

Please move these two up.

> +#include <linux/reset.h>
> +#include <linux/soc/ti/ti_sci_protocol.h>
> +
> +#include "omap_remoteproc.h"
> +#include "remoteproc_internal.h"
> +#include "ti_sci_proc.h"
> +
> +#define KEYSTONE_RPROC_LOCAL_ADDRESS_MASK	(SZ_16M - 1)
> +
> +/**
> + * struct k3_dsp_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 DSP view
> + * @size: Size of the memory region
> + */
> +struct k3_dsp_rproc_mem {

I would rename this 'k3_dsp_mem' to be consistent with k3_r5_mem.

> +	void __iomem *cpu_addr;
> +	phys_addr_t bus_addr;
> +	u32 dev_addr;
> +	size_t size;
> +};
> +
> +/**
> + * struct k3_dsp_mem_data - memory definitions for a DSP
> + * @name: name for this memory entry
> + * @dev_addr: device address for the memory entry
> + */
> +struct k3_dsp_mem_data {
> +	const char *name;
> +	const u32 dev_addr;
> +};
> +
> +/**
> + * struct k3_dsp_dev_data - device data structure for a DSP
> + * @mems: pointer to memory definitions for a DSP
> + * @num_mems: number of memory regions in @mems
> + * @boot_align_addr: boot vector address alignment granularity
> + * @uses_lreset: flag to denote the need for local reset management
> + */
> +struct k3_dsp_dev_data {
> +	const struct k3_dsp_mem_data *mems;
> +	u32 num_mems;
> +	u32 boot_align_addr;
> +	bool uses_lreset;
> +};
> +
> +/**
> + * struct k3_dsp_rproc - k3 DSP remote processor driver structure
> + * @dev: cached device pointer
> + * @rproc: remoteproc device handle
> + * @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
> + * @data: pointer to DSP-specific device data
> + * @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_dsp_rproc {
> +	struct device *dev;
> +	struct rproc *rproc;
> +	struct k3_dsp_rproc_mem *mem;
> +	int num_mems;
> +	struct k3_dsp_rproc_mem *rmem;
> +	int num_rmems;
> +	struct reset_control *reset;
> +	const struct k3_dsp_dev_data *data;
> +	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_dsp_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 OMAP 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_dsp_rproc_mbox_callback(struct mbox_client *client, void *data)
> +{
> +	struct k3_dsp_rproc *kproc = container_of(client, struct k3_dsp_rproc,
> +						client);

Indentation problem.

> +	struct device *dev = kproc->rproc->dev.parent;
> +	const char *name = kproc->rproc->name;
> +	u32 msg = omap_mbox_message(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 DSP rproc %s crashed\n", name);
> +		break;
> +	case RP_MBOX_ECHO_REPLY:
> +		dev_info(dev, "received echo reply from %s\n", name);
> +		break;
> +	default:
> +		/* silently handle all other valid messages */
> +		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
> +			return;
> +		if (msg > kproc->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(kproc->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_dsp_rproc_kick(struct rproc *rproc, int vqid)
> +{
> +	struct k3_dsp_rproc *kproc = rproc->priv;
> +	struct device *dev = rproc->dev.parent;
> +	mbox_msg_t msg = (mbox_msg_t)vqid;
> +	int ret;
> +
> +	/* send the index of the triggered virtqueue in the mailbox payload */
> +	ret = mbox_send_message(kproc->mbox, (void *)msg);
> +	if (ret < 0)
> +		dev_err(dev, "failed to send mailbox message, status = %d\n",
> +			ret);
> +}
> +
> +/* Put the DSP processor into reset */
> +static int k3_dsp_rproc_reset(struct k3_dsp_rproc *kproc)
> +{
> +	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;
> +	}
> +
> +	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, ret = %d\n", ret);
> +		if (reset_control_deassert(kproc->reset))
> +			dev_warn(dev, "local-reset deassert back failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +/* Release the DSP processor from reset */
> +static int k3_dsp_rproc_release(struct k3_dsp_rproc *kproc)
> +{
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	ret = kproc->ti_sci->ops.dev_ops.get_device(kproc->ti_sci,
> +						   kproc->ti_sci_id);

Indentation problem.

> +	if (ret) {
> +		dev_err(dev, "module-reset deassert failed, ret = %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = reset_control_deassert(kproc->reset);
> +	if (ret) {
> +		dev_err(dev, "local-reset deassert failed, ret = %d\n", ret);
> +		if (kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
> +							  kproc->ti_sci_id))
> +			dev_warn(dev, "module-reset assert back failed\n");
> +	}
> +
> +	return ret;
> +}
> +
> +/*
> + * Power up the DSP 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.
> + */
> +static int k3_dsp_rproc_start(struct rproc *rproc)
> +{
> +	struct k3_dsp_rproc *kproc = rproc->priv;
> +	struct mbox_client *client = &kproc->client;
> +	struct device *dev = kproc->dev;
> +	u32 boot_addr;
> +	int ret;
> +
> +	client->dev = dev;
> +	client->tx_done = NULL;
> +	client->rx_callback = k3_dsp_rproc_mbox_callback;
> +	client->tx_block = false;
> +	client->knows_txdone = false;
> +
> +	kproc->mbox = mbox_request_channel(client, 0);
> +	if (IS_ERR(kproc->mbox)) {
> +		ret = -EBUSY;
> +		dev_err(dev, "mbox_request_channel failed: %ld\n",
> +			PTR_ERR(kproc->mbox));
> +		return 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);
> +		goto put_mbox;
> +	}
> +
> +	boot_addr = rproc->bootaddr;
> +	if (boot_addr & (kproc->data->boot_align_addr - 1)) {
> +		dev_err(dev, "invalid boot address 0x%x, must be aligned on a 0x%x boundary\n",
> +			boot_addr, kproc->data->boot_align_addr);
> +		ret = -EINVAL;
> +		goto put_mbox;
> +	}
> +
> +	dev_err(dev, "booting DSP core using boot addr = 0x%x\n", boot_addr);
> +	ret = ti_sci_proc_set_config(kproc->tsp, boot_addr, 0, 0);
> +	if (ret)
> +		goto put_mbox;
> +
> +	ret = k3_dsp_rproc_release(kproc);
> +	if (ret)
> +		goto put_mbox;
> +
> +	return 0;
> +
> +put_mbox:
> +	mbox_free_channel(kproc->mbox);
> +	return ret;
> +}
> +
> +/*
> + * Stop the DSP remote processor.
> + *
> + * This function puts the DSP processor into reset, and finishes processing
> + * of any pending messages.
> + */
> +static int k3_dsp_rproc_stop(struct rproc *rproc)
> +{
> +	struct k3_dsp_rproc *kproc = rproc->priv;
> +
> +	mbox_free_channel(kproc->mbox);
> +
> +	k3_dsp_rproc_reset(kproc);
> +
> +	return 0;
> +}
> +
> +/*
> + * Custom function to translate a DSP device address (internal RAMs only) to a
> + * kernel virtual address.  The DSPs can access their RAMs at either an internal
> + * address visible only from a DSP, 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_dsp_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
> +{
> +	struct k3_dsp_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;
> +
> +		if (da < KEYSTONE_RPROC_LOCAL_ADDRESS_MASK) {
> +			/* handle DSP-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;
> +			}
> +		} else {
> +			/* 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 const struct rproc_ops k3_dsp_rproc_ops = {
> +	.start		= k3_dsp_rproc_start,
> +	.stop		= k3_dsp_rproc_stop,
> +	.kick		= k3_dsp_rproc_kick,
> +	.da_to_va	= k3_dsp_rproc_da_to_va,
> +};
> +
> +static const char *k3_dsp_rproc_get_firmware(struct device *dev)
> +{
> +	const char *fw_name;
> +	int ret;
> +
> +	ret = of_property_read_string(dev->of_node, "firmware-name",
> +				      &fw_name);
> +	if (ret) {
> +		dev_err(dev, "failed to parse firmware-name property, ret = %d\n",
> +			ret);
> +		return ERR_PTR(ret);
> +	}
> +
> +	return fw_name;
> +}

The above is a carbon copy of k3_r5_rproc_get_firmware().  Please reuse the same
function.

> +
> +static int k3_dsp_rproc_of_get_memories(struct platform_device *pdev,
> +					struct k3_dsp_rproc *kproc)
> +{
> +	const struct k3_dsp_dev_data *data = kproc->data;
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	int num_mems = 0;
> +	int i;
> +
> +	num_mems = kproc->data->num_mems;
> +	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,
> +						   data->mems[i].name);
> +		if (!res) {
> +			dev_err(dev, "found no memory resource for %s\n",
> +				data->mems[i].name);
> +			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",
> +				data->mems[i].name);
> +			return -EBUSY;
> +		}
> +
> +		kproc->mem[i].cpu_addr = devm_ioremap_wc(dev, res->start,
> +							 resource_size(res));
> +		if (IS_ERR(kproc->mem[i].cpu_addr)) {
> +			dev_err(dev, "failed to map %s memory\n",
> +				data->mems[i].name);
> +			return PTR_ERR(kproc->mem[i].cpu_addr);
> +		}
> +		kproc->mem[i].bus_addr = res->start;
> +		kproc->mem[i].dev_addr = data->mems[i].dev_addr;
> +		kproc->mem[i].size = resource_size(res);
> +
> +		dev_dbg(dev, "memory %8s: bus addr %pa size 0x%zx va %pK da 0x%x\n",
> +			data->mems[i].name, &kproc->mem[i].bus_addr,
> +			kproc->mem[i].size, kproc->mem[i].cpu_addr,
> +			kproc->mem[i].dev_addr);
> +
> +		/* zero out memories to start in a pristine state */
> +		/*
> +		 * FIXME: comment out until kernel crash is fixed, possible
> +		 * issue with local resets.
> +		 * memset((__force void *)kproc->mem[i].cpu_addr, 0,
> +		 *      kproc->mem[i].size);
> +		 */

Things still work without zero'ing out the memory?  As such is it mandatory to
do so? Function k3_r5_core_of_get_internal_memories does not do a memset().  And
didn't Peng also had this problem?

> +	}
> +	kproc->num_mems = num_mems;
> +
> +	return 0;
> +}
> +
> +static int k3_dsp_reserved_mem_init(struct k3_dsp_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, ret = %d\n",
> +			num_rmems);
> +		return -EINVAL;
> +	}
> +	if (num_rmems < 2) {
> +		dev_err(dev, "device needs atleast 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, ret = %d\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	num_rmems--;
> +	kproc->rmem = kcalloc(num_rmems, sizeof(*kproc->rmem), GFP_KERNEL);
> +	if (!kproc->rmem) {
> +		ret = -ENOMEM;
> +		goto release_rmem;
> +	}
> +
> +	/* 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) {
> +			ret = -EINVAL;
> +			goto unmap_rmem;
> +		}
> +
> +		rmem = of_reserved_mem_lookup(rmem_np);
> +		if (!rmem) {
> +			of_node_put(rmem_np);
> +			ret = -EINVAL;
> +			goto unmap_rmem;
> +		}
> +		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 = ioremap_wc(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);
> +			ret = -ENOMEM;
> +			goto unmap_rmem;
> +		}
> +
> +		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;
> +
> +unmap_rmem:
> +	for (i--; i >= 0; i--) {
> +		if (kproc->rmem[i].cpu_addr)
> +			iounmap(kproc->rmem[i].cpu_addr);
> +	}
> +	kfree(kproc->rmem);
> +release_rmem:
> +	of_reserved_mem_device_release(kproc->dev);
> +	return ret;
> +}

Other than the type of structure passed to the function, this is an exact
replica of k3_r5_reserved_mem_init().  Do you foresee either of them changing
to a point where reusing code would be counter productive?  I think we are right
on the edge where duplication is better than using the same function.

> +
> +static void k3_dsp_reserved_mem_exit(struct k3_dsp_rproc *kproc)
> +{
> +	int i;
> +
> +	for (i = 0; i < kproc->num_rmems; i++)
> +		iounmap(kproc->rmem[i].cpu_addr);
> +	kfree(kproc->rmem);
> +
> +	of_reserved_mem_device_release(kproc->dev);
> +}
> +
> +static
> +struct ti_sci_proc *k3_dsp_rproc_of_get_tsp(struct device *dev,
> +					    const struct ti_sci_handle *sci)
> +{
> +	struct ti_sci_proc *tsp;
> +	u32 temp[2];
> +	int ret;
> +
> +	ret = of_property_read_u32_array(dev->of_node, "ti,sci-proc-ids",
> +					 temp, 2);
> +	if (ret < 0)
> +		return ERR_PTR(ret);
> +
> +	tsp = kzalloc(sizeof(*tsp), GFP_KERNEL);
> +	if (!tsp)
> +		return ERR_PTR(-ENOMEM);
> +
> +	tsp->dev = dev;
> +	tsp->sci = sci;
> +	tsp->ops = &sci->ops.proc_ops;
> +	tsp->proc_id = temp[0];
> +	tsp->host_id = temp[1];
> +
> +	return tsp;
> +}

Contrary to k3_dsp_reserved_mem_init(), this one can definitely be reused for
both c66 and r5.

> +
> +static int k3_dsp_rproc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	const struct k3_dsp_dev_data *data;
> +	struct k3_dsp_rproc *kproc;
> +	struct rproc *rproc;
> +	const char *fw_name;
> +	int ret = 0;
> +	int ret1;
> +
> +	data = of_device_get_match_data(dev);
> +	if (!data)
> +		return -ENODEV;
> +
> +	fw_name = k3_dsp_rproc_get_firmware(dev);
> +	if (IS_ERR(fw_name))
> +		return PTR_ERR(fw_name);
> +
> +	rproc = rproc_alloc(dev, dev_name(dev), &k3_dsp_rproc_ops, fw_name,
> +			    sizeof(*kproc));
> +	if (!rproc)
> +		return -ENOMEM;
> +
> +	rproc->has_iommu = false;
> +	rproc->recovery_disabled = true;
> +	kproc = rproc->priv;
> +	kproc->rproc = rproc;
> +	kproc->dev = dev;
> +	kproc->data = data;
> +
> +	kproc->ti_sci = ti_sci_get_by_phandle(np, "ti,sci");
> +	if (IS_ERR(kproc->ti_sci)) {
> +		ret = PTR_ERR(kproc->ti_sci);
> +		if (ret != -EPROBE_DEFER) {
> +			dev_err(dev, "failed to get ti-sci handle, ret = %d\n",
> +				ret);
> +		}
> +		kproc->ti_sci = NULL;
> +		goto free_rproc;
> +	}
> +
> +	ret = of_property_read_u32(np, "ti,sci-dev-id", &kproc->ti_sci_id);
> +	if (ret) {
> +		dev_err(dev, "missing 'ti,sci-dev-id' property\n");
> +		goto put_sci;
> +	}
> +
> +	kproc->reset = devm_reset_control_get_exclusive(dev, NULL);
> +	if (IS_ERR(kproc->reset)) {
> +		ret = PTR_ERR(kproc->reset);
> +		dev_err(dev, "failed to get reset, status = %d\n", ret);
> +		goto put_sci;
> +	}
> +
> +	kproc->tsp = k3_dsp_rproc_of_get_tsp(dev, kproc->ti_sci);
> +	if (IS_ERR(kproc->tsp)) {
> +		dev_err(dev, "failed to construct ti-sci proc control, ret = %d\n",
> +			ret);
> +		ret = PTR_ERR(kproc->tsp);
> +		goto put_sci;
> +	}
> +
> +	ret = ti_sci_proc_request(kproc->tsp);
> +	if (ret < 0) {
> +		dev_err(dev, "ti_sci_proc_request failed, ret = %d\n", ret);
> +		goto free_tsp;
> +	}
> +
> +	pm_runtime_enable(dev);
> +	ret = pm_runtime_get_sync(dev);

What do these give you since the dev_pm_ops is not set for the
k3_dsp_rproc_driver platform diver and there is no clock specified in the DT?

Thanks,
Mathieu

> +	if (ret < 0) {
> +		dev_err(dev, "failed to enable clock, status = %d\n", ret);
> +		pm_runtime_put_noidle(dev);
> +		goto disable_rpm;
> +	}
> +
> +	ret = k3_dsp_rproc_of_get_memories(pdev, kproc);
> +	if (ret)
> +		goto disable_clk;
> +
> +	ret = k3_dsp_reserved_mem_init(kproc);
> +	if (ret) {
> +		dev_err(dev, "reserved memory init failed, ret = %d\n", ret);
> +		goto disable_clk;
> +	}
> +
> +	ret = rproc_add(rproc);
> +	if (ret) {
> +		dev_err(dev, "failed to add register device with remoteproc core, status = %d\n",
> +			ret);
> +		goto release_mem;
> +	}
> +
> +	platform_set_drvdata(pdev, kproc);
> +
> +	return 0;
> +
> +release_mem:
> +	k3_dsp_reserved_mem_exit(kproc);
> +disable_clk:
> +	pm_runtime_put_sync(dev);
> +disable_rpm:
> +	pm_runtime_disable(dev);
> +	ret1 = ti_sci_proc_release(kproc->tsp);
> +	if (ret1)
> +		dev_err(dev, "failed to release proc, ret = %d\n", ret1);
> +free_tsp:
> +	kfree(kproc->tsp);
> +put_sci:
> +	ret1 = ti_sci_put_handle(kproc->ti_sci);
> +	if (ret1)
> +		dev_err(dev, "failed to put ti_sci handle, ret = %d\n", ret1);
> +free_rproc:
> +	rproc_free(rproc);
> +	return ret;
> +}
> +
> +static int k3_dsp_rproc_remove(struct platform_device *pdev)
> +{
> +	struct k3_dsp_rproc *kproc = platform_get_drvdata(pdev);
> +	struct device *dev = &pdev->dev;
> +	int ret;
> +
> +	rproc_del(kproc->rproc);
> +	pm_runtime_put_sync(&pdev->dev);
> +	pm_runtime_disable(&pdev->dev);
> +
> +	ret = ti_sci_proc_release(kproc->tsp);
> +	if (ret)
> +		dev_err(dev, "failed to release proc, ret = %d\n", ret);
> +
> +	kfree(kproc->tsp);
> +
> +	ret = ti_sci_put_handle(kproc->ti_sci);
> +	if (ret)
> +		dev_err(dev, "failed to put ti_sci handle, ret = %d\n", ret);
> +
> +	k3_dsp_reserved_mem_exit(kproc);
> +	rproc_free(kproc->rproc);
> +
> +	return 0;
> +}
> +
> +static const struct k3_dsp_mem_data c66_mems[] = {
> +	{ .name = "l2sram", .dev_addr = 0x800000 },
> +	{ .name = "l1pram", .dev_addr = 0xe00000 },
> +	{ .name = "l1dram", .dev_addr = 0xf00000 },
> +};
> +
> +static const struct k3_dsp_dev_data c66_data = {
> +	.mems = c66_mems,
> +	.num_mems = ARRAY_SIZE(c66_mems),
> +	.boot_align_addr = SZ_1K,
> +	.uses_lreset = true,
> +};
> +
> +static const struct of_device_id k3_dsp_of_match[] = {
> +	{ .compatible = "ti,j721e-c66-dsp", .data = &c66_data, },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, k3_dsp_of_match);
> +
> +static struct platform_driver k3_dsp_rproc_driver = {
> +	.probe	= k3_dsp_rproc_probe,
> +	.remove	= k3_dsp_rproc_remove,
> +	.driver	= {
> +		.name = "k3-dsp-rproc",
> +		.of_match_table = k3_dsp_of_match,
> +	},
> +};
> +
> +module_platform_driver(k3_dsp_rproc_driver);
> +
> +MODULE_AUTHOR("Suman Anna <s-anna@...com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("TI K3 DSP Remoteproc driver");
> -- 
> 2.23.0
> 

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