PSCI: Fix MISRA defects in platform code

Fix violations of MISRA C-2012 Rules 10.1, 10.3, 13.3, 14.4, 17.7 and
17.8.

Change-Id: I6c9725e428b5752f1d80684ec29cb6c52a5c0c2d
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

include/plat/common/platform.h

@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __PLATFORM_H__
-#define __PLATFORM_H__
+#ifndef PLATFORM_H
+#define PLATFORM_H
 
 #include <psci.h>
 #include <stdint.h>
@@ -401,5 +401,4 @@ unsigned int platform_get_core_pos(unsigned long mpidr) __deprecated;
 
 #endif /* __ENABLE_PLAT_COMPAT__ */
 
-#endif /* __PLATFORM_H__ */
-
+#endif /* PLATFORM_H */

plat/arm/common/arm_nor_psci_mem_protect.c

@@ -51,14 +51,14 @@ int arm_psci_read_mem_protect(int *enabled)
  ******************************************************************************/
 int arm_nor_psci_write_mem_protect(int val)
 {
-	int enable = (val != 0);
+	int enable = (val != 0) ? 1 : 0;
 
 	if (nor_unlock(PLAT_ARM_MEM_PROT_ADDR) != 0) {
 		ERROR("unlocking memory protect variable\n");
 		return -1;
 	}
 
-	if (enable != 0) {
+	if (enable == 1) {
 		/*
 		 * If we want to write a value different than 0
 		 * then we have to erase the full block because
@@ -117,14 +117,14 @@ void arm_nor_psci_do_static_mem_protect(void)
 {
 	int enable;
 
-	arm_psci_read_mem_protect(&enable);
+	(void) arm_psci_read_mem_protect(&enable);
 	if (enable == 0)
 		return;
 
 	INFO("PSCI: Overwriting non secure memory\n");
 	clear_mem_regions(arm_ram_ranges,
 			  ARRAY_SIZE(arm_ram_ranges));
-	arm_nor_psci_write_mem_protect(0);
+	(void) arm_nor_psci_write_mem_protect(0);
 }
 
 /*******************************************************************************

plat/arm/common/arm_pm.c

@@ -30,11 +30,11 @@ extern unsigned int arm_pm_idle_states[];
 int arm_validate_power_state(unsigned int power_state,
 			    psci_power_state_t *req_state)
 {
-	int pstate = psci_get_pstate_type(power_state);
-	int pwr_lvl = psci_get_pstate_pwrlvl(power_state);
-	int i;
+	unsigned int pstate = psci_get_pstate_type(power_state);
+	unsigned int pwr_lvl = psci_get_pstate_pwrlvl(power_state);
+	unsigned int i;
 
-	assert(req_state);
+	assert(req_state > 0U);
 
 	if (pwr_lvl > PLAT_MAX_PWR_LVL)
 		return PSCI_E_INVALID_PARAMS;
@@ -59,7 +59,7 @@ int arm_validate_power_state(unsigned int power_state,
 	/*
 	 * We expect the 'state id' to be zero.
 	 */
-	if (psci_get_pstate_id(power_state))
+	if (psci_get_pstate_id(power_state) != 0U)
 		return PSCI_E_INVALID_PARAMS;
 
 	return PSCI_E_SUCCESS;

plat/common/plat_psci_common.c

@@ -67,7 +67,7 @@ static u_register_t calc_stat_residency(unsigned long long pwrupts,
 void plat_psci_stat_accounting_start(
 	__unused const psci_power_state_t *state_info)
 {
-	assert(state_info);
+	assert(state_info != NULL);
 	PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_ENTER_LOW_PWR,
 		PMF_NO_CACHE_MAINT);
 }
@@ -80,7 +80,7 @@ void plat_psci_stat_accounting_start(
 void plat_psci_stat_accounting_stop(
 	__unused const psci_power_state_t *state_info)
 {
-	assert(state_info);
+	assert(state_info != NULL);
 	PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_EXIT_LOW_PWR,
 		PMF_NO_CACHE_MAINT);
 }
@@ -97,12 +97,12 @@ u_register_t plat_psci_stat_get_residency(unsigned int lvl,
 	unsigned long long pwrup_ts = 0, pwrdn_ts = 0;
 	unsigned int pmf_flags;
 
-	assert(lvl >= PSCI_CPU_PWR_LVL && lvl <= PLAT_MAX_PWR_LVL);
-	assert(state_info);
-	assert(last_cpu_idx >= 0 && last_cpu_idx <= PLATFORM_CORE_COUNT);
+	assert((lvl >= PSCI_CPU_PWR_LVL) && (lvl <= PLAT_MAX_PWR_LVL));
+	assert(state_info != NULL);
+	assert(last_cpu_idx <= PLATFORM_CORE_COUNT);
 
 	if (lvl == PSCI_CPU_PWR_LVL)
-		assert(last_cpu_idx == plat_my_core_pos());
+		assert((unsigned int)last_cpu_idx == plat_my_core_pos());
 
 	/*
 	 * If power down is requested, then timestamp capture will
@@ -110,10 +110,10 @@ u_register_t plat_psci_stat_get_residency(unsigned int lvl,
 	 * when reading the timestamp.
 	 */
 	state = state_info->pwr_domain_state[PSCI_CPU_PWR_LVL];
-	if (is_local_state_off(state)) {
+	if (is_local_state_off(state) != 0) {
 		pmf_flags = PMF_CACHE_MAINT;
 	} else {
-		assert(is_local_state_retn(state));
+		assert(is_local_state_retn(state) == 1);
 		pmf_flags = PMF_NO_CACHE_MAINT;
 	}
 
@@ -150,14 +150,18 @@ plat_local_state_t plat_get_target_pwr_state(unsigned int lvl,
 					     unsigned int ncpu)
 {
 	plat_local_state_t target = PLAT_MAX_OFF_STATE, temp;
+	const plat_local_state_t *st = states;
+	unsigned int n = ncpu;
 
-	assert(ncpu);
+	assert(ncpu > 0U);
 
 	do {
-		temp = *states++;
+		temp = *st;
+		st++;
 		if (temp < target)
 			target = temp;
-	} while (--ncpu);
+		n--;
+	} while (n > 0U);
 
 	return target;
 }