Tegra: support to set the L2 ECC and Parity enable bit

This patch adds capability to read the boot flag to enable L2 ECC
and Parity Protection bit for the Cortex-A57 CPUs. The previous
bootloader sets this flag value for the platform.

* with some coverity fix:
MISRA C-2012 Directive 4.6
MISRA C-2012 Rule 2.5
MISRA C-2012 Rule 10.3
MISRA C-2012 Rule 10.4

Change-Id: Id7303bbbdc290b52919356c31625847b8904b073
Signed-off-by: Harvey Hsieh <hhsieh@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

docs/plat/nvidia-tegra.rst

@@ -80,6 +80,8 @@ uint64\_t tzdram\_size;
 uint64\_t tzdram\_base;
 /* UART port ID \*/
 int uart\_id;
+/* L2 ECC parity protection disable flag \*/
+int l2\_ecc\_parity\_prot\_dis;
 } plat\_params\_from\_bl2\_t;
 
 Power Management

plat/nvidia/tegra/common/aarch64/tegra_helpers.S

@@ -45,7 +45,6 @@
 	.globl	ns_image_entrypoint
 	.globl	tegra_bl31_phys_base
 	.globl	tegra_console_base
-	.globl	tegra_enable_l2_ecc_parity_prot
 
 	/* ---------------------
 	 * Common CPU init code
@@ -92,20 +91,6 @@
 	msr	actlr_el2, x0
 	isb
 
-	/* -------------------------------------------------------
-	 * Enable L2 ECC and Parity Protection
-	 * -------------------------------------------------------
-	 */
-	adr	x0, tegra_enable_l2_ecc_parity_prot
-	ldr	x0, [x0]
-	cbz	x0, 1f
-	mrs	x0, CORTEX_A57_L2CTLR_EL1
-	and	x1, x0, #CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT
-	cbnz	x1, 1f
-	orr	x0, x0, #CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT
-	msr	CORTEX_A57_L2CTLR_EL1, x0
-	isb
-
 	/* --------------------------------
 	 * Enable the cycle count register
 	 * --------------------------------
@@ -460,10 +445,3 @@ tegra_bl31_phys_base:
 	 */
 tegra_console_base:
 	.quad	0
-
-	/* --------------------------------------------------
-	 * Enable L2 ECC and Parity Protection
-	 * --------------------------------------------------
-	 */
-tegra_enable_l2_ecc_parity_prot:
-	.quad	0

plat/nvidia/tegra/common/tegra_bl31_setup.c

@@ -157,6 +157,7 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
 	plat_bl31_params_from_bl2.tzdram_base = plat_params->tzdram_base;
 	plat_bl31_params_from_bl2.tzdram_size = plat_params->tzdram_size;
 	plat_bl31_params_from_bl2.uart_id = plat_params->uart_id;
+	plat_bl31_params_from_bl2.l2_ecc_parity_prot_dis = plat_params->l2_ecc_parity_prot_dis;
 
 	/*
 	 * It is very important that we run either from TZDRAM or TZSRAM base.

plat/nvidia/tegra/include/tegra_private.h

@@ -32,8 +32,15 @@ typedef struct plat_params_from_bl2 {
 	uint64_t tzdram_base;
 	/* UART port ID */
 	int uart_id;
+	/* L2 ECC parity protection disable flag */
+	int l2_ecc_parity_prot_dis;
 } plat_params_from_bl2_t;
 
+/*******************************************************************************
+ * Helper function to access l2ctlr_el1 register on Cortex-A57 CPUs
+ ******************************************************************************/
+DEFINE_RENAME_SYSREG_RW_FUNCS(l2ctlr_el1, CORTEX_A57_L2CTLR_EL1)
+
 /*******************************************************************************
  * Struct describing parameters passed to bl31
  ******************************************************************************/

plat/nvidia/tegra/soc/t186/plat_psci_handlers.c

@@ -12,6 +12,7 @@
 #include <common/bl_common.h>
 #include <common/debug.h>
 #include <context.h>
+#include <cortex_a57.h>
 #include <denver.h>
 #include <lib/el3_runtime/context_mgmt.h>
 #include <lib/psci/psci.h>
@@ -282,6 +283,22 @@ int tegra_soc_pwr_domain_on_finish(const psci_power_state_t *target_state)
 	int stateid_afflvl2 = target_state->pwr_domain_state[PLAT_MAX_PWR_LVL];
 	int stateid_afflvl0 = target_state->pwr_domain_state[MPIDR_AFFLVL0];
 	mce_cstate_info_t cstate_info = { 0 };
+	uint64_t impl, val;
+	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
+
+	impl = (read_midr() >> MIDR_IMPL_SHIFT) & (uint64_t)MIDR_IMPL_MASK;
+
+	/*
+	 * Enable ECC and Parity Protection for Cortex-A57 CPUs (Tegra186
+	 * A02p and beyond).
+	 */
+	if ((plat_params->l2_ecc_parity_prot_dis != 1) &&
+	    (impl != (uint64_t)DENVER_IMPL)) {
+
+		val = read_l2ctlr_el1();
+		val |= (uint64_t)CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT;
+		write_l2ctlr_el1(val);
+	}
 
 	/*
 	 * Reset power state info for CPUs when onlining, we set

plat/nvidia/tegra/soc/t186/plat_setup.c

@@ -27,9 +27,6 @@
 #include <tegra_platform.h>
 #include <tegra_private.h>
 
-DEFINE_RENAME_SYSREG_RW_FUNCS(l2ctlr_el1, CORTEX_A57_L2CTLR_EL1)
-extern uint64_t tegra_enable_l2_ecc_parity_prot;
-
 /*******************************************************************************
  * Tegra186 CPU numbers in cluster #0
  *******************************************************************************
@@ -152,48 +149,29 @@ uint32_t plat_get_console_from_id(int id)
 	return tegra186_uart_addresses[id];
 }
 
-/* represent chip-version as concatenation of major (15:12), minor (11:8) and subrev (7:0) */
-#define TEGRA186_VER_A02P	0x1201
-
 /*******************************************************************************
  * Handler for early platform setup
  ******************************************************************************/
 void plat_early_platform_setup(void)
 {
-	int impl = (read_midr() >> MIDR_IMPL_SHIFT) & MIDR_IMPL_MASK;
-	uint32_t chip_subrev, val;
+	uint64_t impl, val;
+	const plat_params_from_bl2_t *plat_params = bl31_get_plat_params();
 
 	/* sanity check MCE firmware compatibility */
 	mce_verify_firmware_version();
 
+	impl = (read_midr() >> MIDR_IMPL_SHIFT) & (uint64_t)MIDR_IMPL_MASK;
+
 	/*
-	 * Enable ECC and Parity Protection for Cortex-A57 CPUs
-	 * for Tegra A02p SKUs
+	 * Enable ECC and Parity Protection for Cortex-A57 CPUs (Tegra186
+	 * A02p and beyond).
 	 */
-	if (impl != DENVER_IMPL) {
-
-		/* get the major, minor and sub-version values */
-		chip_subrev = mmio_read_32(TEGRA_FUSE_BASE + OPT_SUBREVISION) &
-			      SUBREVISION_MASK;
-
-		/* prepare chip version number */
-		val = (tegra_get_chipid_major() << 12) |
-		      (tegra_get_chipid_minor() << 8) |
-		       chip_subrev;
-
-		/* enable L2 ECC for Tegra186 A02P and beyond */
-		if (val >= TEGRA186_VER_A02P) {
-
-			val = read_l2ctlr_el1();
-			val |= CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT;
-			write_l2ctlr_el1(val);
-
-			/*
-			 * Set the flag to enable ECC/Parity Protection
-			 * when we exit System Suspend or Cluster Powerdn
-			 */
-			tegra_enable_l2_ecc_parity_prot = 1;
-		}
+	if ((plat_params->l2_ecc_parity_prot_dis != 1) &&
+	    (impl != (uint64_t)DENVER_IMPL)) {
+
+		val = read_l2ctlr_el1();
+		val |= (uint64_t)CORTEX_A57_L2_ECC_PARITY_PROTECTION_BIT;
+		write_l2ctlr_el1(val);
 	}
 }