Revert "perf/smmuv3: Allow sharing MMIO registers with the SMMU driver"

This reverts commit 779bed7.

see: #152

drivers/perf/arm_smmuv3_pmu.c

@@ -758,32 +758,19 @@ static int smmu_pmu_probe(struct platform_device *pdev)
 		.capabilities	= PERF_PMU_CAP_NO_EXCLUDE,
 	};
 
-	/*
-	 * If the PMCG registers are embedded into the SMMU regions, the
-	 * resources have to be shared with the SMMU driver. Use ioremap()
-	 * rather than ioremap_resource() to avoid conflicts.
-	 */
 	res_0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res_0)
-		return -ENXIO;
-
-	smmu_pmu->reg_base = devm_ioremap(dev, res_0->start,
-					  resource_size(res_0));
-	if (!smmu_pmu->reg_base)
-		return -ENOMEM;
+	smmu_pmu->reg_base = devm_ioremap_resource(dev, res_0);
+	if (IS_ERR(smmu_pmu->reg_base))
+		return PTR_ERR(smmu_pmu->reg_base);
 
 	cfgr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_CFGR);
 
 	/* Determine if page 1 is present */
 	if (cfgr & SMMU_PMCG_CFGR_RELOC_CTRS) {
 		res_1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-		if (!res_1)
-			return -ENXIO;
-
-		smmu_pmu->reloc_base = devm_ioremap(dev, res_1->start,
-						    resource_size(res_1));
-		if (!smmu_pmu->reloc_base)
-			return -ENOMEM;
+		smmu_pmu->reloc_base = devm_ioremap_resource(dev, res_1);
+		if (IS_ERR(smmu_pmu->reloc_base))
+			return PTR_ERR(smmu_pmu->reloc_base);
 	} else {
 		smmu_pmu->reloc_base = smmu_pmu->reg_base;
 	}