[PATCH v2 12/12] bus: fsl-mc: Add ACPI support for fsl-mc

[Laurentiu Tudor]

On 6/19/2020 11:20 AM, Lorenzo Pieralisi wrote:
> From: Makarand Pawagi <makarand.pawagi at nxp.com>
> 
> Add ACPI support in the fsl-mc driver. Driver parses MC DSDT table to
> extract memory and other resources.
> 
> Interrupt (GIC ITS) information is extracted from the MADT table
> by drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c.
> 
> IORT table is parsed to configure DMA.
> 
> Signed-off-by: Makarand Pawagi <makarand.pawagi at nxp.com>
> Signed-off-by: Diana Craciun <diana.craciun at oss.nxp.com>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor at nxp.com>
> ---
>  drivers/bus/fsl-mc/fsl-mc-bus.c             | 73 ++++++++++++----
>  drivers/bus/fsl-mc/fsl-mc-msi.c             | 37 +++++----
>  drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c | 92 ++++++++++++++++-----
>  3 files changed, 150 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> index 824ff77bbe86..324d49d6df89 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -18,6 +18,8 @@
>  #include <linux/bitops.h>
>  #include <linux/msi.h>
>  #include <linux/dma-mapping.h>
> +#include <linux/acpi.h>
> +#include <linux/iommu.h>
>  
>  #include "fsl-mc-private.h"
>  
> @@ -38,6 +40,7 @@ struct fsl_mc {
>  	struct fsl_mc_device *root_mc_bus_dev;
>  	u8 num_translation_ranges;
>  	struct fsl_mc_addr_translation_range *translation_ranges;
> +	void *fsl_mc_regs;
>  };
>  
>  /**
> @@ -56,6 +59,10 @@ struct fsl_mc_addr_translation_range {
>  	phys_addr_t start_phys_addr;
>  };
>  
> +#define FSL_MC_FAPR	0x28
> +#define MC_FAPR_PL	BIT(18)
> +#define MC_FAPR_BMT	BIT(17)
> +
>  /**
>   * fsl_mc_bus_match - device to driver matching callback
>   * @dev: the fsl-mc device to match against
> @@ -124,7 +131,10 @@ static int fsl_mc_dma_configure(struct device *dev)
>  	while (dev_is_fsl_mc(dma_dev))
>  		dma_dev = dma_dev->parent;
>  
> -	return of_dma_configure_id(dev, dma_dev->of_node, 0, &input_id);
> +	if (dev_of_node(dma_dev))
> +		return of_dma_configure_id(dev, dma_dev->of_node, 0, &input_id);
> +
> +	return acpi_dma_configure_id(dev, DEV_DMA_COHERENT, &input_id);
>  }
>  
>  static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
> @@ -865,8 +875,11 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
>  	struct fsl_mc_io *mc_io = NULL;
>  	int container_id;
>  	phys_addr_t mc_portal_phys_addr;
> -	u32 mc_portal_size;
> -	struct resource res;
> +	u32 mc_portal_size, mc_stream_id;
> +	struct resource *plat_res;
> +
> +	if (!iommu_present(&fsl_mc_bus_type))
> +		return -EPROBE_DEFER;
>  
>  	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
>  	if (!mc)
> @@ -874,19 +887,33 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, mc);
>  
> +	plat_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	mc->fsl_mc_regs = devm_ioremap_resource(&pdev->dev, plat_res);
> +	if (IS_ERR(mc->fsl_mc_regs))
> +		return PTR_ERR(mc->fsl_mc_regs);
> +
> +	if (IS_ENABLED(CONFIG_ACPI) && !dev_of_node(&pdev->dev)) {
> +		mc_stream_id = readl(mc->fsl_mc_regs + FSL_MC_FAPR);
> +		/*
> +		 * HW ORs the PL and BMT bit, places the result in bit 15 of
> +		 * the StreamID and ORs in the ICID. Calculate it accordingly.
> +		 */
> +		mc_stream_id = (mc_stream_id & 0xffff) |
> +				((mc_stream_id & (MC_FAPR_PL | MC_FAPR_BMT)) ?
> +					0x4000 : 0);
> +		error = acpi_dma_configure_id(&pdev->dev, DEV_DMA_COHERENT,
> +					      &mc_stream_id);
> +		if (error)
> +			dev_warn(&pdev->dev, "failed to configure dma: %d.\n",
> +				 error);
> +	}
> +
>  	/*
>  	 * Get physical address of MC portal for the root DPRC:
>  	 */
> -	error = of_address_to_resource(pdev->dev.of_node, 0, &res);
> -	if (error < 0) {
> -		dev_err(&pdev->dev,
> -			"of_address_to_resource() failed for %pOF\n",
> -			pdev->dev.of_node);
> -		return error;
> -	}
> -
> -	mc_portal_phys_addr = res.start;
> -	mc_portal_size = resource_size(&res);
> +	plat_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	mc_portal_phys_addr = plat_res->start;
> +	mc_portal_size = resource_size(plat_res);
>  	error = fsl_create_mc_io(&pdev->dev, mc_portal_phys_addr,
>  				 mc_portal_size, NULL,
>  				 FSL_MC_IO_ATOMIC_CONTEXT_PORTAL, &mc_io);
> @@ -903,11 +930,13 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
>  	dev_info(&pdev->dev, "MC firmware version: %u.%u.%u\n",
>  		 mc_version.major, mc_version.minor, mc_version.revision);
>  
> -	error = get_mc_addr_translation_ranges(&pdev->dev,
> -					       &mc->translation_ranges,
> -					       &mc->num_translation_ranges);
> -	if (error < 0)
> -		goto error_cleanup_mc_io;
> +	if (dev_of_node(&pdev->dev)) {
> +		error = get_mc_addr_translation_ranges(&pdev->dev,
> +						&mc->translation_ranges,
> +						&mc->num_translation_ranges);
> +		if (error < 0)
> +			goto error_cleanup_mc_io;
> +	}
>  
>  	error = dprc_get_container_id(mc_io, 0, &container_id);
>  	if (error < 0) {
> @@ -934,6 +963,7 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
>  		goto error_cleanup_mc_io;
>  
>  	mc->root_mc_bus_dev = mc_bus_dev;
> +	mc_bus_dev->dev.fwnode = pdev->dev.fwnode;

Makarand, this looks a bit weird. Is there really a reason for it?

---
Best Regards, Laurentiu