[PATCH v9 13/16] drivers: iommu: arm-smmu: add IORT configuration

[Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>]

In ACPI based systems, in order to be able to create platform
devices and initialize them for ARM SMMU components, the IORT
kernel implementation requires a set of static functions to be
used by the IORT kernel layer to configure platform devices for
ARM SMMU components.

Add static configuration functions to the IORT kernel layer for
the ARM SMMU components, so that the ARM SMMU driver can
initialize its respective platform device by relying on the IORT
kernel infrastructure and by adding a corresponding ACPI device
early probe section entry.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Tomasz Nowicki <tn@semihalf.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
---
 drivers/acpi/arm64/iort.c | 71 +++++++++++++++++++++++++++++++++++++++++++
 drivers/iommu/arm-smmu.c  | 77 ++++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/acpi_iort.h |  3 ++
 3 files changed, 150 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index fd52e4c..8a8ae5e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -548,6 +548,68 @@ static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
 	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
 }
 
+static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
+{
+	struct acpi_iort_smmu *smmu;
+
+	/* Retrieve SMMU specific data */
+	smmu = (struct acpi_iort_smmu *)node->node_data;
+
+	/*
+	 * Only consider the global fault interrupt and ignore the
+	 * configuration access interrupt.
+	 *
+	 * MMIO address and global fault interrupt resources are always
+	 * present so add them to the context interrupt count as a static
+	 * value.
+	 */
+	return smmu->context_interrupt_count + 2;
+}
+
+static void __init arm_smmu_init_resources(struct resource *res,
+					   struct acpi_iort_node *node)
+{
+	struct acpi_iort_smmu *smmu;
+	int i, hw_irq, trigger, num_res = 0;
+	u64 *ctx_irq, *glb_irq;
+
+	/* Retrieve SMMU specific data */
+	smmu = (struct acpi_iort_smmu *)node->node_data;
+
+	res[num_res].start = smmu->base_address;
+	res[num_res].end = smmu->base_address + smmu->span - 1;
+	res[num_res].flags = IORESOURCE_MEM;
+	num_res++;
+
+	glb_irq = ACPI_ADD_PTR(u64, node, smmu->global_interrupt_offset);
+	/* Global IRQs */
+	hw_irq = IORT_IRQ_MASK(glb_irq[0]);
+	trigger = IORT_IRQ_TRIGGER_MASK(glb_irq[0]);
+
+	acpi_iort_register_irq(hw_irq, "arm-smmu-global", trigger,
+				     &res[num_res++]);
+
+	/* Context IRQs */
+	ctx_irq = ACPI_ADD_PTR(u64, node, smmu->context_interrupt_offset);
+	for (i = 0; i < smmu->context_interrupt_count; i++) {
+		hw_irq = IORT_IRQ_MASK(ctx_irq[i]);
+		trigger = IORT_IRQ_TRIGGER_MASK(ctx_irq[i]);
+
+		acpi_iort_register_irq(hw_irq, "arm-smmu-context", trigger,
+				       &res[num_res++]);
+	}
+}
+
+static bool __init arm_smmu_is_coherent(struct acpi_iort_node *node)
+{
+	struct acpi_iort_smmu *smmu;
+
+	/* Retrieve SMMU specific data */
+	smmu = (struct acpi_iort_smmu *)node->node_data;
+
+	return smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK;
+}
+
 struct iort_iommu_config {
 	const char *name;
 	int (*iommu_init)(struct acpi_iort_node *node);
@@ -564,12 +626,21 @@ static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
 	.iommu_init_resources = arm_smmu_v3_init_resources
 };
 
+static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
+	.name = "arm-smmu",
+	.iommu_is_coherent = arm_smmu_is_coherent,
+	.iommu_count_resources = arm_smmu_count_resources,
+	.iommu_init_resources = arm_smmu_init_resources
+};
+
 static __init
 const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
 {
 	switch (node->type) {
 	case ACPI_IORT_NODE_SMMU_V3:
 		return &iort_arm_smmu_v3_cfg;
+	case ACPI_IORT_NODE_SMMU:
+		return &iort_arm_smmu_cfg;
 	default:
 		return NULL;
 	}
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 573b2b6..8e66b16 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -28,6 +28,8 @@
 
 #define pr_fmt(fmt) "arm-smmu: " fmt
 
+#include <linux/acpi.h>
+#include <linux/acpi_iort.h>
 #include <linux/atomic.h>
 #include <linux/delay.h>
 #include <linux/dma-iommu.h>
@@ -1904,6 +1906,64 @@ static const struct of_device_id arm_smmu_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
 
+#ifdef CONFIG_ACPI
+static int acpi_smmu_get_data(u32 model, struct arm_smmu_device *smmu)
+{
+	int ret = 0;
+
+	switch (model) {
+	case ACPI_IORT_SMMU_V1:
+	case ACPI_IORT_SMMU_CORELINK_MMU400:
+		smmu->version = ARM_SMMU_V1;
+		smmu->model = GENERIC_SMMU;
+		break;
+	case ACPI_IORT_SMMU_V2:
+		smmu->version = ARM_SMMU_V2;
+		smmu->model = GENERIC_SMMU;
+		break;
+	case ACPI_IORT_SMMU_CORELINK_MMU500:
+		smmu->version = ARM_SMMU_V2;
+		smmu->model = ARM_MMU500;
+		break;
+	default:
+		ret = -ENODEV;
+	}
+
+	return ret;
+}
+
+static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
+				      struct arm_smmu_device *smmu)
+{
+	struct device *dev = smmu->dev;
+	struct acpi_iort_node *node =
+		*(struct acpi_iort_node **)dev_get_platdata(dev);
+	struct acpi_iort_smmu *iort_smmu;
+	int ret;
+
+	/* Retrieve SMMU1/2 specific data */
+	iort_smmu = (struct acpi_iort_smmu *)node->node_data;
+
+	ret = acpi_smmu_get_data(iort_smmu->model, smmu);
+	if (ret < 0)
+		return ret;
+
+	/* Ignore the configuration access interrupt */
+	smmu->num_global_irqs = 1;
+
+	if (iort_smmu->flags & ACPI_IORT_SMMU_COHERENT_WALK)
+		smmu->features |= ARM_SMMU_FEAT_COHERENT_WALK;
+
+	return 0;
+}
+#else
+static inline int arm_smmu_device_acpi_probe(struct platform_device *pdev,
+					     struct arm_smmu_device *smmu)
+{
+	return -ENODEV;
+}
+#endif
+
 static int arm_smmu_device_dt_probe(struct platform_device *pdev,
 				    struct arm_smmu_device *smmu)
 {
@@ -1955,7 +2015,11 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	}
 	smmu->dev = dev;
 
-	err = arm_smmu_device_dt_probe(pdev, smmu);
+	if (dev->of_node)
+		err = arm_smmu_device_dt_probe(pdev, smmu);
+	else
+		err = arm_smmu_device_acpi_probe(pdev, smmu);
+
 	if (err)
 		return err;
 
@@ -2103,6 +2167,17 @@ IOMMU_OF_DECLARE(arm_mmu401, "arm,mmu-401", arm_smmu_of_init);
 IOMMU_OF_DECLARE(arm_mmu500, "arm,mmu-500", arm_smmu_of_init);
 IOMMU_OF_DECLARE(cavium_smmuv2, "cavium,smmu-v2", arm_smmu_of_init);
 
+#ifdef CONFIG_ACPI
+static int __init arm_smmu_acpi_init(struct acpi_table_header *table)
+{
+	if (iort_node_match(ACPI_IORT_NODE_SMMU))
+		return arm_smmu_init();
+
+	return 0;
+}
+IORT_ACPI_DECLARE(arm_smmu, ACPI_SIG_IORT, arm_smmu_acpi_init);
+#endif
+
 MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
 MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
 MODULE_LICENSE("GPL v2");
diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
index 17bb078..79ba1bb 100644
--- a/include/linux/acpi_iort.h
+++ b/include/linux/acpi_iort.h
@@ -23,6 +23,9 @@
 #include <linux/fwnode.h>
 #include <linux/irqdomain.h>
 
+#define IORT_IRQ_MASK(irq)		(irq & 0xffffffffULL)
+#define IORT_IRQ_TRIGGER_MASK(irq)	((irq >> 32) & 0xffffffffULL)
+
 int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node);
 void iort_deregister_domain_token(int trans_id);
 struct fwnode_handle *iort_find_domain_token(int trans_id);
-- 
2.10.0