Re: [PATCHv4 07/14] remoteproc/omap: Add support for DRA7xx remote processors

[Tero Kristo <t-kristo@ti.com>]

On 08/01/2020 21:39, Suman Anna wrote:
> Hi Tero,
> 
> On 1/2/20 7:18 AM, Tero Kristo wrote:
>> From: Suman Anna <s-anna@ti.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@ti.com>
>> [t-kristo@ti.com: moved address translation quirks to pdata]
>> Signed-off-by: Tero Kristo <t-kristo@ti.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.

This one is actually intentional. The only expected failure is missing 
the ti,bootreg-shift, but even this is a valid situation; we will just 
use bootreg shift value of zero (boot-data is zero initialized.)

-Tero

> 
> regards
> Suman
> 
>> +
>>   	return 0;
>>   }
>>   
>>
> 

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