Add missing features to the Tegra GIC driver

In order to handle secure/non-secure interrupts, overload the plat_ic_*
functions and copy GIC helper functions from arm_gic.c. Use arm_gic.c
as the reference to add Tegra's GIC helper functions.

Now that Tegra has its own GIC implementation, we have no use for
plat_gic.c and arm_gic.c files.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/tegra_common.mk

@@ -43,14 +43,12 @@ PLAT_BL_COMMON_SOURCES	:=	lib/aarch64/xlat_tables.c			\
 
 COMMON_DIR		:=	plat/nvidia/tegra/common
 
-BL31_SOURCES		+=	drivers/arm/gic/arm_gic.c			\
-				drivers/arm/gic/gic_v2.c			\
+BL31_SOURCES		+=	drivers/arm/gic/gic_v2.c			\
 				drivers/arm/gic/gic_v3.c			\
 				drivers/console/console.S			\
 				drivers/ti/uart/16550_console.S			\
 				lib/cpus/aarch64/cortex_a53.S			\
 				lib/cpus/aarch64/cortex_a57.S			\
-				plat/common/plat_gic.c				\
 				plat/common/aarch64/platform_mp_stack.S		\
 				${COMMON_DIR}/aarch64/tegra_helpers.S		\
 				${COMMON_DIR}/drivers/memctrl/memctrl.c		\

plat/nvidia/tegra/common/tegra_gic.c

@@ -30,6 +30,7 @@
 
 #include <arch_helpers.h>
 #include <assert.h>
+#include <arm_gic.h>
 #include <bl_common.h>
 #include <debug.h>
 #include <gic_v2.h>
@@ -39,6 +40,13 @@
 #include <tegra_private.h>
 #include <tegra_def.h>
 
+/* Value used to initialize Non-Secure IRQ priorities four at a time */
+#define GICD_IPRIORITYR_DEF_VAL \
+	(GIC_HIGHEST_NS_PRIORITY | \
+	(GIC_HIGHEST_NS_PRIORITY << 8) | \
+	(GIC_HIGHEST_NS_PRIORITY << 16) | \
+	(GIC_HIGHEST_NS_PRIORITY << 24))
+
 /*******************************************************************************
  * Place the cpu interface in a state where it can never make a cpu exit wfi as
  * as result of an asserted interrupt. This is critical for powering down a cpu
@@ -61,10 +69,40 @@ void tegra_gic_cpuif_deactivate(void)
  ******************************************************************************/
 static void tegra_gic_cpuif_setup(unsigned int gicc_base)
 {
-	gicc_write_ctlr(gicc_base, ENABLE_GRP0 | ENABLE_GRP1);
+	unsigned int val;
+
+	val = ENABLE_GRP0 | ENABLE_GRP1 | FIQ_EN | FIQ_BYP_DIS_GRP0;
+	val |= IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP1 | IRQ_BYP_DIS_GRP1;
+
+	gicc_write_ctlr(gicc_base, val);
 	gicc_write_pmr(gicc_base, GIC_PRI_MASK);
 }
 
+/*******************************************************************************
+ * Per cpu gic distributor setup which will be done by all cpus after a cold
+ * boot/hotplug. This marks out the secure interrupts & enables them.
+ ******************************************************************************/
+static void tegra_gic_pcpu_distif_setup(unsigned int gicd_base)
+{
+	unsigned int index, sec_ppi_sgi_mask = 0;
+
+	assert(gicd_base);
+
+	/* Setup PPI priorities doing four at a time */
+	for (index = 0; index < 32; index += 4) {
+		gicd_write_ipriorityr(gicd_base, index,
+				GICD_IPRIORITYR_DEF_VAL);
+	}
+
+	/*
+	 * Invert the bitmask to create a mask for non-secure PPIs and
+	 * SGIs. Program the GICD_IGROUPR0 with this bit mask. This write will
+	 * update the GICR_IGROUPR0 as well in case we are running on a GICv3
+	 * system. This is critical if GICD_CTLR.ARE_NS=1.
+	 */
+	gicd_write_igroupr(gicd_base, 0, ~sec_ppi_sgi_mask);
+}
+
 /*******************************************************************************
  * Global gic distributor setup which will be done by the primary cpu after a
  * cold boot. It marks out the non secure SPIs, PPIs & SGIs and enables them.
@@ -72,7 +110,7 @@ static void tegra_gic_cpuif_setup(unsigned int gicc_base)
  ******************************************************************************/
 static void tegra_gic_distif_setup(unsigned int gicd_base)
 {
-	unsigned int ctr, num_ints;
+	unsigned int index, num_ints;
 
 	/*
 	 * Mark out non-secure interrupts. Calculate number of
@@ -80,9 +118,22 @@ static void tegra_gic_distif_setup(unsigned int gicd_base)
 	 * number of IT_LINES
 	 */
 	num_ints = gicd_read_typer(gicd_base) & IT_LINES_NO_MASK;
-	num_ints++;
-	for (ctr = 0; ctr < num_ints; ctr++)
-		gicd_write_igroupr(gicd_base, ctr << IGROUPR_SHIFT, ~0);
+	num_ints = (num_ints + 1) << 5;
+	for (index = MIN_SPI_ID; index < num_ints; index += 32)
+		gicd_write_igroupr(gicd_base, index, ~0);
+
+	/* Setup SPI priorities doing four at a time */
+	for (index = MIN_SPI_ID; index < num_ints; index += 4) {
+		gicd_write_ipriorityr(gicd_base, index,
+				GICD_IPRIORITYR_DEF_VAL);
+	}
+
+	/*
+	 * Configure the SGI and PPI. This is done in a separated function
+	 * because each CPU is responsible for initializing its own private
+	 * interrupts.
+	 */
+	tegra_gic_pcpu_distif_setup(gicd_base);
 
 	/* enable distributor */
 	gicd_write_ctlr(gicd_base, ENABLE_GRP0 | ENABLE_GRP1);
@@ -93,3 +144,151 @@ void tegra_gic_setup(void)
 	tegra_gic_cpuif_setup(TEGRA_GICC_BASE);
 	tegra_gic_distif_setup(TEGRA_GICD_BASE);
 }
+
+/*******************************************************************************
+ * An ARM processor signals interrupt exceptions through the IRQ and FIQ pins.
+ * The interrupt controller knows which pin/line it uses to signal a type of
+ * interrupt. This function provides a common implementation of
+ * plat_interrupt_type_to_line() in an ARM GIC environment for optional re-use
+ * across platforms. It lets the interrupt management framework determine
+ * for a type of interrupt and security state, which line should be used in the
+ * SCR_EL3 to control its routing to EL3. The interrupt line is represented as
+ * the bit position of the IRQ or FIQ bit in the SCR_EL3.
+ ******************************************************************************/
+uint32_t tegra_gic_interrupt_type_to_line(uint32_t type,
+				uint32_t security_state)
+{
+	assert(type == INTR_TYPE_S_EL1 ||
+	       type == INTR_TYPE_EL3 ||
+	       type == INTR_TYPE_NS);
+
+	assert(sec_state_is_valid(security_state));
+
+	/*
+	 * We ignore the security state parameter under the assumption that
+	 * both normal and secure worlds are using ARM GICv2. This parameter
+	 * will be used when the secure world starts using GICv3.
+	 */
+#if ARM_GIC_ARCH == 2
+	return gicv2_interrupt_type_to_line(TEGRA_GICC_BASE, type);
+#else
+#error "Invalid ARM GIC architecture version specified for platform port"
+#endif /* ARM_GIC_ARCH */
+}
+
+#if ARM_GIC_ARCH == 2
+/*******************************************************************************
+ * This function returns the type of the highest priority pending interrupt at
+ * the GIC cpu interface. INTR_TYPE_INVAL is returned when there is no
+ * interrupt pending.
+ ******************************************************************************/
+uint32_t tegra_gic_get_pending_interrupt_type(void)
+{
+	uint32_t id;
+
+	id = gicc_read_hppir(TEGRA_GICC_BASE) & INT_ID_MASK;
+
+	/* Assume that all secure interrupts are S-EL1 interrupts */
+	if (id < 1022)
+		return INTR_TYPE_S_EL1;
+
+	if (id == GIC_SPURIOUS_INTERRUPT)
+		return INTR_TYPE_INVAL;
+
+	return INTR_TYPE_NS;
+}
+
+/*******************************************************************************
+ * This function returns the id of the highest priority pending interrupt at
+ * the GIC cpu interface. INTR_ID_UNAVAILABLE is returned when there is no
+ * interrupt pending.
+ ******************************************************************************/
+uint32_t tegra_gic_get_pending_interrupt_id(void)
+{
+	uint32_t id;
+
+	id = gicc_read_hppir(TEGRA_GICC_BASE) & INT_ID_MASK;
+
+	if (id < 1022)
+		return id;
+
+	if (id == 1023)
+		return INTR_ID_UNAVAILABLE;
+
+	/*
+	 * Find out which non-secure interrupt it is under the assumption that
+	 * the GICC_CTLR.AckCtl bit is 0.
+	 */
+	return gicc_read_ahppir(TEGRA_GICC_BASE) & INT_ID_MASK;
+}
+
+/*******************************************************************************
+ * This functions reads the GIC cpu interface Interrupt Acknowledge register
+ * to start handling the pending interrupt. It returns the contents of the IAR.
+ ******************************************************************************/
+uint32_t tegra_gic_acknowledge_interrupt(void)
+{
+	return gicc_read_IAR(TEGRA_GICC_BASE);
+}
+
+/*******************************************************************************
+ * This functions writes the GIC cpu interface End Of Interrupt register with
+ * the passed value to finish handling the active interrupt
+ ******************************************************************************/
+void tegra_gic_end_of_interrupt(uint32_t id)
+{
+	gicc_write_EOIR(TEGRA_GICC_BASE, id);
+}
+
+/*******************************************************************************
+ * This function returns the type of the interrupt id depending upon the group
+ * this interrupt has been configured under by the interrupt controller i.e.
+ * group0 or group1.
+ ******************************************************************************/
+uint32_t tegra_gic_get_interrupt_type(uint32_t id)
+{
+	uint32_t group;
+
+	group = gicd_get_igroupr(TEGRA_GICD_BASE, id);
+
+	/* Assume that all secure interrupts are S-EL1 interrupts */
+	if (group == GRP0)
+		return INTR_TYPE_S_EL1;
+	else
+		return INTR_TYPE_NS;
+}
+
+#else
+#error "Invalid ARM GIC architecture version specified for platform port"
+#endif /* ARM_GIC_ARCH */
+
+uint32_t plat_ic_get_pending_interrupt_id(void)
+{
+	return tegra_gic_get_pending_interrupt_id();
+}
+
+uint32_t plat_ic_get_pending_interrupt_type(void)
+{
+	return tegra_gic_get_pending_interrupt_type();
+}
+
+uint32_t plat_ic_acknowledge_interrupt(void)
+{
+	return tegra_gic_acknowledge_interrupt();
+}
+
+uint32_t plat_ic_get_interrupt_type(uint32_t id)
+{
+	return tegra_gic_get_interrupt_type(id);
+}
+
+void plat_ic_end_of_interrupt(uint32_t id)
+{
+	tegra_gic_end_of_interrupt(id);
+}
+
+uint32_t plat_interrupt_type_to_line(uint32_t type,
+				uint32_t security_state)
+{
+	return tegra_gic_interrupt_type_to_line(type, security_state);
+}