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

Laurentiu Tudor laurentiu.tudor at nxp.com
Thu May 21 15:03:21 UTC 2020


Hi Lorenzo,

On 5/21/2020 4:00 PM, Lorenzo Pieralisi wrote:
> From: Diana Craciun <diana.craciun at oss.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>
> ---

The author of this patch should be Makarand. I think I accidentaly broke
it when we exchanged the patches. Very sorry about it.

---
Best Regards, Laurentiu


>  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 | 75 ++++++++++++++++++++-
>  3 files changed, 150 insertions(+), 35 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;
>  	return 0;
>  
>  error_cleanup_mc_io:
> @@ -967,11 +997,18 @@ static const struct of_device_id fsl_mc_bus_match_table[] = {
>  
>  MODULE_DEVICE_TABLE(of, fsl_mc_bus_match_table);
>  
> +static const struct acpi_device_id fsl_mc_bus_acpi_match_table[] = {
> +	{"NXP0008", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(acpi, fsl_mc_bus_acpi_match_table);
> +
>  static struct platform_driver fsl_mc_bus_driver = {
>  	.driver = {
>  		   .name = "fsl_mc_bus",
>  		   .pm = NULL,
>  		   .of_match_table = fsl_mc_bus_match_table,
> +		   .acpi_match_table = fsl_mc_bus_acpi_match_table,
>  		   },
>  	.probe = fsl_mc_bus_probe,
>  	.remove = fsl_mc_bus_remove,
> diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
> index e7bbff445a83..8edadf05cbb7 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-msi.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
> @@ -13,6 +13,7 @@
>  #include <linux/irq.h>
>  #include <linux/irqdomain.h>
>  #include <linux/msi.h>
> +#include <linux/acpi_iort.h>
>  
>  #include "fsl-mc-private.h"
>  
> @@ -179,25 +180,31 @@ struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
>  
>  struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
>  {
> -	struct irq_domain *msi_domain = NULL;
> +	struct device *root_dprc_dev;
> +	struct device *bus_dev;
> +	struct irq_domain *msi_domain;
>  	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
>  
> -	msi_domain = of_msi_map_get_device_domain(dev, mc_dev->icid,
> +	fsl_mc_get_root_dprc(dev, &root_dprc_dev);
> +	bus_dev = root_dprc_dev->parent;
> +
> +	if (bus_dev->of_node) {
> +		msi_domain = of_msi_map_get_device_domain(dev,
> +						  mc_dev->icid,
>  						  DOMAIN_BUS_FSL_MC_MSI);
>  
> -	/*
> -	 * if the msi-map property is missing assume that all the
> -	 * child containers inherit the domain from the parent
> -	 */
> -	if (!msi_domain) {
> -		struct device *root_dprc_dev;
> -		struct device *bus_dev;
> -
> -		fsl_mc_get_root_dprc(dev, &root_dprc_dev);
> -		bus_dev = root_dprc_dev->parent;
> -		msi_domain = of_msi_get_domain(bus_dev,
> -					       bus_dev->of_node,
> -					       DOMAIN_BUS_FSL_MC_MSI);
> +		/*
> +		 * if the msi-map property is missing assume that all the
> +		 * child containers inherit the domain from the parent
> +		 */
> +		if (!msi_domain)
> +
> +			msi_domain = of_msi_get_domain(bus_dev,
> +						bus_dev->of_node,
> +						DOMAIN_BUS_FSL_MC_MSI);
> +	} else {
> +		msi_domain = iort_get_device_domain(dev, mc_dev->icid,
> +						    DOMAIN_BUS_FSL_MC_MSI);
>  	}
>  
>  	return msi_domain;
> diff --git a/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c b/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
> index a5c8d577e424..b8b948fb6b2d 100644
> --- a/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
> +++ b/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
> @@ -7,6 +7,8 @@
>   *
>   */
>  
> +#include <linux/acpi.h>
> +#include <linux/acpi_iort.h>
>  #include <linux/of_device.h>
>  #include <linux/of_address.h>
>  #include <linux/irq.h>
> @@ -30,7 +32,8 @@ static u32 fsl_mc_msi_domain_get_msi_id(struct irq_domain *domain,
>  	u32 out_id;
>  
>  	of_node = irq_domain_get_of_node(domain);
> -	out_id = of_msi_map_id(&mc_dev->dev, of_node, mc_dev->icid);
> +	out_id = of_node ? of_msi_map_id(&mc_dev->dev, of_node, mc_dev->icid) :
> +			iort_msi_map_id(&mc_dev->dev, mc_dev->icid);
>  
>  	return out_id;
>  }
> @@ -79,7 +82,67 @@ static const struct of_device_id its_device_id[] = {
>  	{},
>  };
>  
> -static int __init its_fsl_mc_msi_init(void)
> +static int __init its_fsl_mc_msi_init_one(struct fwnode_handle *handle,
> +					  const char *name)
> +{
> +	struct irq_domain *parent;
> +	struct irq_domain *mc_msi_domain;
> +
> +	parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
> +	if (!parent || !msi_get_domain_info(parent)) {
> +		pr_err("%s: Unable to locate ITS domain\n", name);
> +		return -ENXIO;
> +	}
> +
> +	mc_msi_domain = fsl_mc_msi_create_irq_domain(handle,
> +						&its_fsl_mc_msi_domain_info,
> +						parent);
> +	if (!mc_msi_domain)
> +		pr_err("ACPIF: unable to create fsl-mc domain\n");
> +
> +	pr_info("fsl-mc MSI: domain created\n");
> +
> +	return 0;
> +}
> +
> +static int __init
> +its_fsl_mc_msi_parse_madt(union acpi_subtable_headers *header,
> +			  const unsigned long end)
> +{
> +	struct acpi_madt_generic_translator *its_entry;
> +	struct fwnode_handle *dom_handle;
> +	const char *node_name;
> +	int err = -ENXIO;
> +
> +	its_entry = (struct acpi_madt_generic_translator *)header;
> +	node_name = kasprintf(GFP_KERNEL, "ITS at 0x%lx",
> +			      (long)its_entry->base_address);
> +
> +	dom_handle = iort_find_domain_token(its_entry->translation_id);
> +	if (!dom_handle) {
> +		pr_err("%s: Unable to locate ITS domain handle\n", node_name);
> +		goto out;
> +	}
> +
> +	err = its_fsl_mc_msi_init_one(dom_handle, node_name);
> +	if (!err)
> +		pr_info("fsl-mc MSI: %s domain created\n", node_name);
> +
> +out:
> +	kfree(node_name);
> +	return err;
> +}
> +
> +
> +static int __init its_fsl_mc_acpi_msi_init(void)
> +{
> +	acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
> +			      its_fsl_mc_msi_parse_madt, 0);
> +
> +	return 0;
> +}
> +
> +static int __init its_fsl_mc_of_msi_init(void)
>  {
>  	struct device_node *np;
>  	struct irq_domain *parent;
> @@ -113,4 +176,12 @@ static int __init its_fsl_mc_msi_init(void)
>  	return 0;
>  }
>  
> +static int __init its_fsl_mc_msi_init(void)
> +{
> +	its_fsl_mc_of_msi_init();
> +	its_fsl_mc_acpi_msi_init();
> +
> +	return 0;
> +}
> +
>  early_initcall(its_fsl_mc_msi_init);
> 


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