Message-ID: <20191217230141.GA16271@xps15>
Date:   Tue, 17 Dec 2019 16:01:41 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Tero Kristo <t-kristo@...com>
Cc:     bjorn.andersson@...aro.org, ohad@...ery.com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Suman Anna <s-anna@...com>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCHv3 02/15] remoteproc/omap: Add device tree support

Hi Tero,

On Fri, Dec 13, 2019 at 02:55:24PM +0200, Tero Kristo wrote:
> From: Suman Anna <s-anna@...com>
> 
> OMAP4+ SoCs support device tree boot only. The OMAP remoteproc
> driver is enhanced to support remoteproc devices created through
> Device Tree, support for legacy platform devices has been
> deprecated. The current DT support handles the IPU and DSP
> processor subsystems on OMAP4 and OMAP5 SoCs.
> 
> The OMAP remoteproc driver relies on the ti-sysc, reset, and
> syscon layers for performing clock, reset and boot vector
> management (DSP remoteprocs only) of the devices, but some of
> these are limited only to the machine-specific layers
> in arch/arm. The dependency against control module API for boot
> vector management of the DSP remoteprocs has now been removed
> with added logic to parse the boot register from the DT node
> and program it appropriately directly within the driver.
> 
> The OMAP remoteproc driver expects the firmware names to be
> provided via device tree entries (firmware-name.) These are used
> to load the proper firmware during boot of the remote processor.
> 
> Cc: Tony Lindgren <tony@...mide.com>
> Signed-off-by: Suman Anna <s-anna@...com>
> [t-kristo@...com: converted to use ti-sysc framework]
> Signed-off-by: Tero Kristo <t-kristo@...com>
> ---
>  drivers/remoteproc/omap_remoteproc.c | 191 +++++++++++++++++++++++----
>  1 file changed, 168 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
> index 6398194075aa..558634624590 100644
> --- a/drivers/remoteproc/omap_remoteproc.c
> +++ b/drivers/remoteproc/omap_remoteproc.c
> @@ -2,7 +2,7 @@
>  /*
>   * OMAP Remote Processor driver
>   *
> - * Copyright (C) 2011 Texas Instruments, Inc.
> + * Copyright (C) 2011-2019 Texas Instruments Incorporated - http://www.ti.com/
>   * Copyright (C) 2011 Google, Inc.
>   *
>   * Ohad Ben-Cohen <ohad@...ery.com>
> @@ -16,27 +16,53 @@
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/err.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/remoteproc.h>
>  #include <linux/mailbox_client.h>
>  #include <linux/omap-mailbox.h>
> -
> -#include <linux/platform_data/remoteproc-omap.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/reset.h>
>  
>  #include "omap_remoteproc.h"
>  #include "remoteproc_internal.h"
>  
> +/**
> + * struct omap_rproc_boot_data - boot data structure for the DSP omap rprocs
> + * @syscon: regmap handle for the system control configuration module
> + * @boot_reg: boot register offset within the @syscon regmap
> + */
> +struct omap_rproc_boot_data {
> +	struct regmap *syscon;
> +	unsigned int boot_reg;
> +};
> +
>  /**
>   * struct omap_rproc - omap remote processor state
>   * @mbox: mailbox channel handle
>   * @client: mailbox client to request the mailbox channel
> + * @boot_data: boot data structure for setting processor boot address
>   * @rproc: rproc handle
> + * @reset: reset handle
>   */
>  struct omap_rproc {
>  	struct mbox_chan *mbox;
>  	struct mbox_client client;
> +	struct omap_rproc_boot_data *boot_data;
>  	struct rproc *rproc;
> +	struct reset_control *reset;
> +};
> +
> +/**
> + * struct omap_rproc_dev_data - device data for the omap remote processor
> + * @device_name: device name of the remote processor
> + * @has_bootreg: true if this remote processor has boot register
> + */
> +struct omap_rproc_dev_data {
> +	const char *device_name;
> +	bool has_bootreg;
>  };
>  
>  /**
> @@ -92,6 +118,21 @@ static void omap_rproc_kick(struct rproc *rproc, int vqid)
>  			ret);
>  }
>  
> +/**
> + * omap_rproc_write_dsp_boot_addr - set boot address for a DSP remote processor
> + * @rproc: handle of a remote processor
> + *
> + * Set boot address for a supported DSP remote processor.
> + */
> +static void omap_rproc_write_dsp_boot_addr(struct rproc *rproc)
> +{
> +	struct omap_rproc *oproc = rproc->priv;
> +	struct omap_rproc_boot_data *bdata = oproc->boot_data;
> +	u32 offset = bdata->boot_reg;
> +
> +	regmap_write(bdata->syscon, offset, rproc->bootaddr);
> +}
> +
>  /*
>   * Power up the remote processor.
>   *
> @@ -103,13 +144,11 @@ static int omap_rproc_start(struct rproc *rproc)
>  {
>  	struct omap_rproc *oproc = rproc->priv;
>  	struct device *dev = rproc->dev.parent;
> -	struct platform_device *pdev = to_platform_device(dev);
> -	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
>  	int ret;
>  	struct mbox_client *client = &oproc->client;
>  
> -	if (pdata->set_bootaddr)
> -		pdata->set_bootaddr(rproc->bootaddr);
> +	if (oproc->boot_data)
> +		omap_rproc_write_dsp_boot_addr(rproc);
>  
>  	client->dev = dev;
>  	client->tx_done = NULL;
> @@ -117,7 +156,7 @@ static int omap_rproc_start(struct rproc *rproc)
>  	client->tx_block = false;
>  	client->knows_txdone = false;
>  
> -	oproc->mbox = omap_mbox_request_channel(client, pdata->mbox_name);
> +	oproc->mbox = mbox_request_channel(client, 0);
>  	if (IS_ERR(oproc->mbox)) {
>  		ret = -EBUSY;
>  		dev_err(dev, "mbox_request_channel failed: %ld\n",
> @@ -138,11 +177,7 @@ static int omap_rproc_start(struct rproc *rproc)
>  		goto put_mbox;
>  	}
>  
> -	ret = pdata->device_enable(pdev);
> -	if (ret) {
> -		dev_err(dev, "omap_device_enable failed: %d\n", ret);
> -		goto put_mbox;
> -	}
> +	reset_control_deassert(oproc->reset);
>  
>  	return 0;
>  
> @@ -154,15 +189,9 @@ static int omap_rproc_start(struct rproc *rproc)
>  /* power off the remote processor */
>  static int omap_rproc_stop(struct rproc *rproc)
>  {
> -	struct device *dev = rproc->dev.parent;
> -	struct platform_device *pdev = to_platform_device(dev);
> -	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
>  	struct omap_rproc *oproc = rproc->priv;
> -	int ret;
>  
> -	ret = pdata->device_shutdown(pdev);
> -	if (ret)
> -		return ret;
> +	reset_control_assert(oproc->reset);
>  
>  	mbox_free_channel(oproc->mbox);
>  
> @@ -175,12 +204,122 @@ static const struct rproc_ops omap_rproc_ops = {
>  	.kick		= omap_rproc_kick,
>  };
>  
> +static const struct omap_rproc_dev_data omap4_dsp_dev_data = {
> +	.device_name	= "dsp",
> +	.has_bootreg	= true,
> +};
> +
> +static const struct omap_rproc_dev_data omap4_ipu_dev_data = {
> +	.device_name	= "ipu",
> +};
> +
> +static const struct omap_rproc_dev_data omap5_dsp_dev_data = {
> +	.device_name	= "dsp",
> +	.has_bootreg	= true,
> +};
> +
> +static const struct omap_rproc_dev_data omap5_ipu_dev_data = {
> +	.device_name	= "ipu",
> +};
> +
> +static const struct of_device_id omap_rproc_of_match[] = {
> +	{
> +		.compatible     = "ti,omap4-dsp",
> +		.data           = &omap4_dsp_dev_data,
> +	},
> +	{
> +		.compatible     = "ti,omap4-ipu",
> +		.data           = &omap4_ipu_dev_data,
> +	},
> +	{
> +		.compatible     = "ti,omap5-dsp",
> +		.data           = &omap5_dsp_dev_data,
> +	},
> +	{
> +		.compatible     = "ti,omap5-ipu",
> +		.data           = &omap5_ipu_dev_data,
> +	},
> +	{
> +		/* end */
> +	},
> +};
> +MODULE_DEVICE_TABLE(of, omap_rproc_of_match);
> +
> +static const char *omap_rproc_get_firmware(struct platform_device *pdev)
> +{
> +	const char *fw_name;
> +	int ret;
> +
> +	ret = of_property_read_string(pdev->dev.of_node, "firmware-name",
> +				      &fw_name);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	return fw_name;
> +}
> +
> +static int omap_rproc_get_boot_data(struct platform_device *pdev,
> +				    struct rproc *rproc)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct omap_rproc *oproc = rproc->priv;
> +	const struct omap_rproc_dev_data *data;
> +	int ret;
> +
> +	data = of_device_get_match_data(&pdev->dev);
> +	if (!data)
> +		return -ENODEV;
> +
> +	if (!data->has_bootreg)
> +		return 0;
> +
> +	oproc->boot_data = devm_kzalloc(&pdev->dev, sizeof(*oproc->boot_data),
> +					GFP_KERNEL);
> +	if (!oproc->boot_data)
> +		return -ENOMEM;
> +
> +	if (!of_property_read_bool(np, "ti,bootreg")) {
> +		dev_err(&pdev->dev, "ti,bootreg property is missing\n");
> +		return -EINVAL;
> +	}
> +
> +	oproc->boot_data->syscon =
> +			syscon_regmap_lookup_by_phandle(np, "ti,bootreg");
> +	if (IS_ERR(oproc->boot_data->syscon)) {
> +		ret = PTR_ERR(oproc->boot_data->syscon);
> +		return ret;
> +	}
> +
> +	if (of_property_read_u32_index(np, "ti,bootreg", 1,
> +				       &oproc->boot_data->boot_reg)) {
> +		dev_err(&pdev->dev, "couldn't get the boot register\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
>  static int omap_rproc_probe(struct platform_device *pdev)
>  {
> -	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
> +	struct device_node *np = pdev->dev.of_node;
>  	struct omap_rproc *oproc;
>  	struct rproc *rproc;
> +	const char *firmware;
>  	int ret;
> +	struct reset_control *reset;
> +
> +	if (!np) {
> +		dev_err(&pdev->dev, "only DT-based devices are supported\n");
> +		return -ENODEV;
> +	}
> +
> +	reset = devm_reset_control_array_get_optional_exclusive(&pdev->dev);
> +	if (IS_ERR(reset))
> +		return PTR_ERR(reset);

Definition of a reset is listed as "required" in the bindings but here it is
optional.  If this is really what you want then adding a comment to exlain your
choice is probably a good idea.

> +
> +	firmware = omap_rproc_get_firmware(pdev);
> +	if (IS_ERR(firmware))
> +		return PTR_ERR(firmware);
>  
>  	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
>  	if (ret) {
> @@ -188,16 +327,21 @@ static int omap_rproc_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
> -			    pdata->firmware, sizeof(*oproc));
> +	rproc = rproc_alloc(&pdev->dev, dev_name(&pdev->dev), &omap_rproc_ops,
> +			    firmware, sizeof(*oproc));
>  	if (!rproc)
>  		return -ENOMEM;
>  
>  	oproc = rproc->priv;
>  	oproc->rproc = rproc;
> +	oproc->reset = reset;
>  	/* All existing OMAP IPU and DSP processors have an MMU */
>  	rproc->has_iommu = true;
>  
> +	ret = omap_rproc_get_boot_data(pdev, rproc);
> +	if (ret)
> +		goto free_rproc;
> +
>  	platform_set_drvdata(pdev, rproc);
>  
>  	ret = rproc_add(rproc);
> @@ -226,6 +370,7 @@ static struct platform_driver omap_rproc_driver = {
>  	.remove = omap_rproc_remove,
>  	.driver = {
>  		.name = "omap-rproc",
> +		.of_match_table = omap_rproc_of_match,

                .of_match_table = of_match_ptr(omap_rproc_of_match),

Thanks,
Mathieu

>  	},
>  };
>  
> -- 
> 2.17.1
> 
> --
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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