Date:   Wed, 8 Jan 2020 13:39:58 -0600
From:   Suman Anna <s-anna@...com>
To:     Tero Kristo <t-kristo@...com>, <bjorn.andersson@...aro.org>,
        <ohad@...ery.com>, <linux-remoteproc@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <mathieu.poirier@...aro.org>,
        <linux-omap@...r.kernel.org>
Subject: Re: [PATCHv4 07/14] remoteproc/omap: Add support for DRA7xx remote
 processors

Hi Tero,

On 1/2/20 7:18 AM, Tero Kristo wrote:
> From: Suman Anna <s-anna@...com>
> 
> DRA7xx/AM57xx SoCs have two IPU and up to two DSP processor subsystems
> for offloading different computation algorithms. The IPU processor
> subsystem contains dual-core ARM Cortex-M4 processors, and is very
> similar to those on OMAP5. The DSP processor subsystem is based on
> the TI's standard TMS320C66x DSP CorePac core.
> 
> Support has been added to the OMAP remoteproc driver through new
> DRA7xx specific compatibles for properly probing and booting all
> the different processor subsystem instances on DRA7xx/AM57xx
> SoCs - IPU1, IPU2, DSP1 & DSP2. A build dependency with SOC_DRA7XX
> is added to enable the driver to be built in DRA7xx-only configuration.
> 
> The DSP boot address programming needed enhancement for DRA7xx as the
> boot register fields are different on DRA7 compared to OMAP4 and OMAP5
> SoCs. The register on DRA7xx contains additional fields within the
> register and the boot address bit-field is right-shifted by 10 bits.
> The internal memory parsing logic has also been updated to compute
> the device addresses for the L2 RAM for DSP devices using relative
> addressing logic, and to parse two additional RAMs at L1 level - L1P
> and L1D. This allows the remoteproc driver to support loading into
> these regions for a small subset of firmware images requiring as
> such. The most common usage would be to use the L1 programmable
> RAMs as L1 Caches.
> 
> The firmware lookup logic also has to be adjusted for DRA7xx as
> there are (can be) more than one instance of both the IPU and DSP
> remote processors for the first time in OMAP4+ SoCs.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> [t-kristo@...com: moved address translation quirks to pdata]
> Signed-off-by: Tero Kristo <t-kristo@...com>
> ---
> v4:
>   - data format change due to device data changes to mem layout
> 
>  drivers/remoteproc/Kconfig           |  2 +-
>  drivers/remoteproc/omap_remoteproc.c | 38 +++++++++++++++++++++++++++-
>  2 files changed, 38 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 94afdde4bc9f..d6450d7fcf92 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -25,7 +25,7 @@ config IMX_REMOTEPROC
>  
>  config OMAP_REMOTEPROC
>  	tristate "OMAP remoteproc support"
> -	depends on ARCH_OMAP4 || SOC_OMAP5
> +	depends on ARCH_OMAP4 || SOC_OMAP5 || SOC_DRA7XX
>  	depends on OMAP_IOMMU
>  	select MAILBOX
>  	select OMAP2PLUS_MBOX
> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
> index 8a6dd742a8b1..9140c528c416 100644
> --- a/drivers/remoteproc/omap_remoteproc.c
> +++ b/drivers/remoteproc/omap_remoteproc.c
> @@ -34,10 +34,13 @@
>   * 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
> + * @boot_reg_shift: bit-field shift required for the boot address value in
> + *		    @boot_reg
>   */
>  struct omap_rproc_boot_data {
>  	struct regmap *syscon;
>  	unsigned int boot_reg;
> +	unsigned int boot_reg_shift;
>  };
>  
>  /**
> @@ -159,6 +162,8 @@ static int 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;
> +	u32 value;
> +	u32 mask;
>  
>  	if (rproc->bootaddr & (SZ_1K - 1)) {
>  		dev_err(dev, "invalid boot address 0x%x, must be aligned on a 1KB boundary\n",
> @@ -166,7 +171,10 @@ static int omap_rproc_write_dsp_boot_addr(struct rproc *rproc)
>  		return -EINVAL;
>  	}
>  
> -	regmap_write(bdata->syscon, offset, rproc->bootaddr);
> +	value = rproc->bootaddr >> bdata->boot_reg_shift;
> +	mask = ~(SZ_1K - 1) >> bdata->boot_reg_shift;
> +
> +	regmap_update_bits(bdata->syscon, offset, mask, value);
>  
>  	return 0;
>  }
> @@ -296,6 +304,13 @@ static const struct omap_rproc_mem_data ipu_mems[] = {
>  	{ },
>  };
>  
> +static const struct omap_rproc_mem_data dra7_dsp_mems[] = {
> +	{ .name = "l2ram", .dev_addr = 0x800000 },
> +	{ .name = "l1pram", .dev_addr = 0xe00000 },
> +	{ .name = "l1dram", .dev_addr = 0xf00000 },
> +	{ },
> +};
> +
>  static const struct omap_rproc_dev_data omap4_dsp_dev_data = {
>  	.device_name	= "dsp",
>  };
> @@ -314,6 +329,16 @@ static const struct omap_rproc_dev_data omap5_ipu_dev_data = {
>  	.mems		= ipu_mems,
>  };
>  
> +static const struct omap_rproc_dev_data dra7_dsp_dev_data = {
> +	.device_name	= "dsp",
> +	.mems		= dra7_dsp_mems,
> +};
> +
> +static const struct omap_rproc_dev_data dra7_ipu_dev_data = {
> +	.device_name	= "ipu",
> +	.mems		= ipu_mems,
> +};
> +
>  static const struct of_device_id omap_rproc_of_match[] = {
>  	{
>  		.compatible     = "ti,omap4-dsp",
> @@ -331,6 +356,14 @@ static const struct of_device_id omap_rproc_of_match[] = {
>  		.compatible     = "ti,omap5-ipu",
>  		.data           = &omap5_ipu_dev_data,
>  	},
> +	{
> +		.compatible     = "ti,dra7-dsp",
> +		.data           = &dra7_dsp_dev_data,
> +	},
> +	{
> +		.compatible     = "ti,dra7-ipu",
> +		.data           = &dra7_ipu_dev_data,
> +	},
>  	{
>  		/* end */
>  	},
> @@ -383,6 +416,9 @@ static int omap_rproc_get_boot_data(struct platform_device *pdev,
>  		return -EINVAL;
>  	}
>  
> +	of_property_read_u32(np, "ti,bootreg-shift",
> +			     &oproc->boot_data->boot_reg_shift);

Missing error checks, guess you will have to change this anyway when you
address Rob's comments.

regards
Suman

> +
>  	return 0;
>  }
>  
> 

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