tegra: hwpm: Add support for next3 chip

- This patch adds the support for next3 chip in the hwpm kernel repo.
- Add NULL check for fake registers before read/write operations.
- On simulation platform, HWPM allocates memory to simulate perfmux and
perfmon address spaces. Update IP instance mask logic to assume perfmux
is available.

Jira THWPM-87
Jira THWPM-88

Change-Id: I6cdc882025d29268452c18b91873f4570f0d3462
Signed-off-by: vasukis <vasukis@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-hwpm/+/2924799
Reviewed-by: Vedashree Vidwans <vvidwans@nvidia.com>
Reviewed-by: Adeel Raza <araza@nvidia.com>
Tested-by: Vedashree Vidwans <vvidwans@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/tegra/hwpm/common/aperture.c

@@ -320,10 +320,24 @@ static int tegra_hwpm_func_single_element(struct tegra_soc_hwpm *hwpm,
 			}
 		}
 
-		/* Validate perfmux availability by reading 1st alist offset */
+		if (hwpm->fake_registers_enabled) {
-		ret = tegra_hwpm_regops_readl(hwpm, ip_inst, element,
+			/*
-			tegra_hwpm_safe_add_u64(element->start_abs_pa,
+			 * In this case, HWPM will allocate memory to simulate
-				element->alist[0U].reg_offset), &reg_val);
+			 * IP perfmux address space. Hence, the perfmux will
+			 * always be available.
+			 * Indicate this by setting ret = 0.
+			 */
+			ret = 0;
+		} else {
+			/*
+			 * Validate perfmux availability by reading 1st alist offset
+			 */
+			ret = tegra_hwpm_regops_readl(hwpm, ip_inst, element,
+				tegra_hwpm_safe_add_u64(element->start_abs_pa,
+					element->alist[0U].reg_offset),
+				&reg_val);
+		}
+
 		if (ret != 0) {
 			/*
 			 * If an IP element is unavailable, perfmux register

drivers/tegra/hwpm/common/init.c

@@ -37,6 +37,9 @@
 #ifdef CONFIG_TEGRA_NEXT2_HWPM
 #include <tegra_hwpm_next2_init.h>
 #endif
+#ifdef CONFIG_TEGRA_NEXT3_HWPM
+#include <tegra_hwpm_next3_init.h>
+#endif
 
 static int tegra_hwpm_init_chip_ip_structures(struct tegra_soc_hwpm *hwpm,
 	u32 chip_id, u32 chip_id_rev)
@@ -63,10 +66,25 @@ static int tegra_hwpm_init_chip_ip_structures(struct tegra_soc_hwpm *hwpm,
 		}
 		break;
 	default:
-#ifdef CONFIG_TEGRA_NEXT2_HWPM
+#if defined(CONFIG_TEGRA_NEXT2_HWPM)
 		err = tegra_hwpm_next2_init_chip_ip_structures(
 			hwpm, chip_id, chip_id_rev);
-#else
+		if (err == 0) {
+			/* Execution is for NEXT2 chip */
+			break;
+		}
+#endif
+
+#if defined(CONFIG_TEGRA_NEXT3_HWPM)
+		err = tegra_hwpm_next3_init_chip_ip_structures(
+			hwpm, chip_id, chip_id_rev);
+		if (err == 0) {
+			/* Execution is for NEXT3 chip */
+			break;
+		}
+#endif
+
+#if !defined(CONFIG_TEGRA_NEXT2_HWPM) && !defined(CONFIG_TEGRA_NEXT3_HWPM)
 		tegra_hwpm_err(hwpm, "Chip 0x%x not supported", chip_id);
 #endif
 		break;

drivers/tegra/hwpm/os/linux/driver.c

@@ -45,6 +45,9 @@ static const struct of_device_id tegra_soc_hwpm_of_match[] = {
 #endif
 #ifdef CONFIG_TEGRA_NEXT2_HWPM
 #include <os/linux/next2_driver.h>
+#endif
+#ifdef CONFIG_TEGRA_NEXT3_HWPM
+#include <os/linux/next3_driver.h>
 #endif
 	{ },
 };

drivers/tegra/hwpm/os/linux/io_utils.c

@@ -52,6 +52,11 @@ int tegra_hwpm_fake_readl_impl(struct tegra_soc_hwpm *hwpm,
 		return -ENODEV;
 	}
 
+	if (aperture->fake_registers == NULL) {
+		tegra_hwpm_err(hwpm, "Expected fake registers to be populated");
+		return -ENODEV;
+	}
+
 	*val = aperture->fake_registers[offset];
 	return 0;
 }
@@ -64,6 +69,11 @@ int tegra_hwpm_fake_writel_impl(struct tegra_soc_hwpm *hwpm,
 		return -ENODEV;
 	}
 
+	if (aperture->fake_registers == NULL) {
+		tegra_hwpm_err(hwpm, "Expected fake registers to be populated");
+		return -ENODEV;
+	}
+
 	aperture->fake_registers[offset] = val;
 	return 0;
 }

drivers/tegra/hwpm/os/linux/soc_utils.c

@@ -34,6 +34,9 @@
 #if defined(CONFIG_TEGRA_NEXT2_HWPM)
 #include <os/linux/next2_soc_utils.h>
 #endif
+#if defined(CONFIG_TEGRA_NEXT3_HWPM)
+#include <os/linux/next3_soc_utils.h>
+#endif
 
 static struct hwpm_soc_chip_info chip_info = {
 	.chip_id = CHIP_ID_UNKNOWN,
@@ -89,6 +92,11 @@ int tegra_hwpm_init_chip_info(struct tegra_hwpm_os_linux *hwpm_linux)
 		goto complete;
 	}
 #endif
+#if defined(CONFIG_TEGRA_NEXT3_HWPM)
+	if (tegra_hwpm_next3_get_chip_compatible(&chip_info) == 0) {
+		goto complete;
+	}
+#endif
 
 	return -ENODEV;
 complete: