Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 251 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c
new file mode 100644
index 000000000..dfe4a4603
--- /dev/null
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -0,0 +1,251 @@
+/*
+ * Root interrupt controller for the BCM2836 (Raspberry Pi 2).
+ *
+ * Copyright 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/cpu.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqchip.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/irq-bcm2836.h>
+
+#include <asm/exception.h>
+
+struct bcm2836_arm_irqchip_intc {
+	struct irq_domain *domain;
+	void __iomem *base;
+};
+
+static struct bcm2836_arm_irqchip_intc intc  __read_mostly;
+
+static void bcm2836_arm_irqchip_mask_per_cpu_irq(unsigned int reg_offset,
+						 unsigned int bit,
+						 int cpu)
+{
+	void __iomem *reg = intc.base + reg_offset + 4 * cpu;
+
+	writel(readl(reg) & ~BIT(bit), reg);
+}
+
+static void bcm2836_arm_irqchip_unmask_per_cpu_irq(unsigned int reg_offset,
+						   unsigned int bit,
+						 int cpu)
+{
+	void __iomem *reg = intc.base + reg_offset + 4 * cpu;
+
+	writel(readl(reg) | BIT(bit), reg);
+}
+
+static void bcm2836_arm_irqchip_mask_timer_irq(struct irq_data *d)
+{
+	bcm2836_arm_irqchip_mask_per_cpu_irq(LOCAL_TIMER_INT_CONTROL0,
+					     d->hwirq - LOCAL_IRQ_CNTPSIRQ,
+					     smp_processor_id());
+}
+
+static void bcm2836_arm_irqchip_unmask_timer_irq(struct irq_data *d)
+{
+	bcm2836_arm_irqchip_unmask_per_cpu_irq(LOCAL_TIMER_INT_CONTROL0,
+					       d->hwirq - LOCAL_IRQ_CNTPSIRQ,
+					       smp_processor_id());
+}
+
+static struct irq_chip bcm2836_arm_irqchip_timer = {
+	.name		= "bcm2836-timer",
+	.irq_mask	= bcm2836_arm_irqchip_mask_timer_irq,
+	.irq_unmask	= bcm2836_arm_irqchip_unmask_timer_irq,
+};
+
+static void bcm2836_arm_irqchip_mask_pmu_irq(struct irq_data *d)
+{
+	writel(1 << smp_processor_id(), intc.base + LOCAL_PM_ROUTING_CLR);
+}
+
+static void bcm2836_arm_irqchip_unmask_pmu_irq(struct irq_data *d)
+{
+	writel(1 << smp_processor_id(), intc.base + LOCAL_PM_ROUTING_SET);
+}
+
+static struct irq_chip bcm2836_arm_irqchip_pmu = {
+	.name		= "bcm2836-pmu",
+	.irq_mask	= bcm2836_arm_irqchip_mask_pmu_irq,
+	.irq_unmask	= bcm2836_arm_irqchip_unmask_pmu_irq,
+};
+
+static void bcm2836_arm_irqchip_mask_gpu_irq(struct irq_data *d)
+{
+}
+
+static void bcm2836_arm_irqchip_unmask_gpu_irq(struct irq_data *d)
+{
+}
+
+static struct irq_chip bcm2836_arm_irqchip_gpu = {
+	.name		= "bcm2836-gpu",
+	.irq_mask	= bcm2836_arm_irqchip_mask_gpu_irq,
+	.irq_unmask	= bcm2836_arm_irqchip_unmask_gpu_irq,
+};
+
+static int bcm2836_map(struct irq_domain *d, unsigned int irq,
+		       irq_hw_number_t hw)
+{
+	struct irq_chip *chip;
+
+	switch (hw) {
+	case LOCAL_IRQ_CNTPSIRQ:
+	case LOCAL_IRQ_CNTPNSIRQ:
+	case LOCAL_IRQ_CNTHPIRQ:
+	case LOCAL_IRQ_CNTVIRQ:
+		chip = &bcm2836_arm_irqchip_timer;
+		break;
+	case LOCAL_IRQ_GPU_FAST:
+		chip = &bcm2836_arm_irqchip_gpu;
+		break;
+	case LOCAL_IRQ_PMU_FAST:
+		chip = &bcm2836_arm_irqchip_pmu;
+		break;
+	default:
+		pr_warn_once("Unexpected hw irq: %lu\n", hw);
+		return -EINVAL;
+	}
+
+	irq_set_percpu_devid(irq);
+	irq_domain_set_info(d, irq, hw, chip, d->host_data,
+			    handle_percpu_devid_irq, NULL, NULL);
+	irq_set_status_flags(irq, IRQ_NOAUTOEN);
+
+	return 0;
+}
+
+static void
+__exception_irq_entry bcm2836_arm_irqchip_handle_irq(struct pt_regs *regs)
+{
+	int cpu = smp_processor_id();
+	u32 stat;
+
+	stat = readl_relaxed(intc.base + LOCAL_IRQ_PENDING0 + 4 * cpu);
+	if (stat & BIT(LOCAL_IRQ_MAILBOX0)) {
+#ifdef CONFIG_SMP
+		void __iomem *mailbox0 = (intc.base +
+					  LOCAL_MAILBOX0_CLR0 + 16 * cpu);
+		u32 mbox_val = readl(mailbox0);
+		u32 ipi = ffs(mbox_val) - 1;
+
+		writel(1 << ipi, mailbox0);
+		handle_IPI(ipi, regs);
+#endif
+	} else if (stat) {
+		u32 hwirq = ffs(stat) - 1;
+
+		handle_domain_irq(intc.domain, hwirq, regs);
+	}
+}
+
+#ifdef CONFIG_SMP
+static void bcm2836_arm_irqchip_send_ipi(const struct cpumask *mask,
+					 unsigned int ipi)
+{
+	int cpu;
+	void __iomem *mailbox0_base = intc.base + LOCAL_MAILBOX0_SET0;
+
+	/*
+	 * Ensure that stores to normal memory are visible to the
+	 * other CPUs before issuing the IPI.
+	 */
+	smp_wmb();
+
+	for_each_cpu(cpu, mask)	{
+		writel(1 << ipi, mailbox0_base + 16 * cpu);
+	}
+}
+
+static int bcm2836_cpu_starting(unsigned int cpu)
+{
+	bcm2836_arm_irqchip_unmask_per_cpu_irq(LOCAL_MAILBOX_INT_CONTROL0, 0,
+					       cpu);
+	return 0;
+}
+
+static int bcm2836_cpu_dying(unsigned int cpu)
+{
+	bcm2836_arm_irqchip_mask_per_cpu_irq(LOCAL_MAILBOX_INT_CONTROL0, 0,
+					     cpu);
+	return 0;
+}
+#endif
+
+static const struct irq_domain_ops bcm2836_arm_irqchip_intc_ops = {
+	.xlate = irq_domain_xlate_onetwocell,
+	.map = bcm2836_map,
+};
+
+static void
+bcm2836_arm_irqchip_smp_init(void)
+{
+#ifdef CONFIG_SMP
+	/* Unmask IPIs to the boot CPU. */
+	cpuhp_setup_state(CPUHP_AP_IRQ_BCM2836_STARTING,
+			  "irqchip/bcm2836:starting", bcm2836_cpu_starting,
+			  bcm2836_cpu_dying);
+
+	set_smp_cross_call(bcm2836_arm_irqchip_send_ipi);
+#endif
+}
+
+/*
+ * The LOCAL_IRQ_CNT* timer firings are based off of the external
+ * oscillator with some scaling.  The firmware sets up CNTFRQ to
+ * report 19.2Mhz, but doesn't set up the scaling registers.
+ */
+static void bcm2835_init_local_timer_frequency(void)
+{
+	/*
+	 * Set the timer to source from the 19.2Mhz crystal clock (bit
+	 * 8 unset), and only increment by 1 instead of 2 (bit 9
+	 * unset).
+	 */
+	writel(0, intc.base + LOCAL_CONTROL);
+
+	/*
+	 * Set the timer prescaler to 1:1 (timer freq = input freq *
+	 * 2**31 / prescaler)
+	 */
+	writel(0x80000000, intc.base + LOCAL_PRESCALER);
+}
+
+static int __init bcm2836_arm_irqchip_l1_intc_of_init(struct device_node *node,
+						      struct device_node *parent)
+{
+	intc.base = of_iomap(node, 0);
+	if (!intc.base) {
+		panic("%pOF: unable to map local interrupt registers\n", node);
+	}
+
+	bcm2835_init_local_timer_frequency();
+
+	intc.domain = irq_domain_add_linear(node, LAST_IRQ + 1,
+					    &bcm2836_arm_irqchip_intc_ops,
+					    NULL);
+	if (!intc.domain)
+		panic("%pOF: unable to create IRQ domain\n", node);
+
+	bcm2836_arm_irqchip_smp_init();
+
+	set_handle_irq(bcm2836_arm_irqchip_handle_irq);
+	return 0;
+}
+
+IRQCHIP_DECLARE(bcm2836_arm_irqchip_l1_intc, "brcm,bcm2836-l1-intc",
+		bcm2836_arm_irqchip_l1_intc_of_init);