1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/mach-versatile/integrator.c b/arch/arm/mach-versatile/integrator.c
new file mode 100644
index 000000000000..fdf9c4db08a7
--- /dev/null
+++ b/arch/arm/mach-versatile/integrator.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/memblock.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/amba/bus.h>
+#include <linux/amba/serial.h>
+#include <linux/io.h>
+#include <linux/stat.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/pgtable.h>
+
+#include <asm/mach-types.h>
+#include <asm/mach/time.h>
+
+#include "integrator-hardware.h"
+#include "integrator-cm.h"
+#include "integrator.h"
+
+static DEFINE_RAW_SPINLOCK(cm_lock);
+static void __iomem *cm_base;
+
+/**
+ * cm_get - get the value from the CM_CTRL register
+ */
+u32 cm_get(void)
+{
+	return readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
+}
+
+/**
+ * cm_control - update the CM_CTRL register.
+ * @mask: bits to change
+ * @set: bits to set
+ */
+void cm_control(u32 mask, u32 set)
+{
+	unsigned long flags;
+	u32 val;
+
+	raw_spin_lock_irqsave(&cm_lock, flags);
+	val = readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET) & ~mask;
+	writel(val | set, cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
+	raw_spin_unlock_irqrestore(&cm_lock, flags);
+}
+
+void cm_clear_irqs(void)
+{
+	/* disable core module IRQs */
+	writel(0xffffffffU, cm_base + INTEGRATOR_HDR_IC_OFFSET +
+		IRQ_ENABLE_CLEAR);
+}
+
+static const struct of_device_id cm_match[] = {
+	{ .compatible = "arm,core-module-integrator"},
+	{ },
+};
+
+void cm_init(void)
+{
+	struct device_node *cm = of_find_matching_node(NULL, cm_match);
+
+	if (!cm) {
+		pr_crit("no core module node found in device tree\n");
+		return;
+	}
+	cm_base = of_iomap(cm, 0);
+	if (!cm_base) {
+		pr_crit("could not remap core module\n");
+		return;
+	}
+	cm_clear_irqs();
+}
+
+/*
+ * We need to stop things allocating the low memory; ideally we need a
+ * better implementation of GFP_DMA which does not assume that DMA-able
+ * memory starts at zero.
+ */
+void __init integrator_reserve(void)
+{
+	memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
+}