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path: root/drivers/platform/x86/intel_scu_wdt.c
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Diffstat (limited to 'drivers/platform/x86/intel_scu_wdt.c')
-rw-r--r--drivers/platform/x86/intel_scu_wdt.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_scu_wdt.c b/drivers/platform/x86/intel_scu_wdt.c
new file mode 100644
index 000000000..c2479777a
--- /dev/null
+++ b/drivers/platform/x86/intel_scu_wdt.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel Merrifield watchdog platform device library file
+ *
+ * (C) Copyright 2014 Intel Corporation
+ * Author: David Cohen <david.a.cohen@linux.intel.com>
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/intel-mid_wdt.h>
+
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+#include <asm/intel-mid.h>
+#include <asm/io_apic.h>
+#include <asm/hw_irq.h>
+
+#define TANGIER_EXT_TIMER0_MSI 12
+
+static struct platform_device wdt_dev = {
+ .name = "intel_mid_wdt",
+ .id = -1,
+};
+
+static int tangier_probe(struct platform_device *pdev)
+{
+ struct irq_alloc_info info;
+ struct intel_mid_wdt_pdata *pdata = pdev->dev.platform_data;
+ int gsi = TANGIER_EXT_TIMER0_MSI;
+ int irq;
+
+ if (!pdata)
+ return -EINVAL;
+
+ /* IOAPIC builds identity mapping between GSI and IRQ on MID */
+ ioapic_set_alloc_attr(&info, cpu_to_node(0), 1, 0);
+ irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC, &info);
+ if (irq < 0) {
+ dev_warn(&pdev->dev, "cannot find interrupt %d in ioapic\n", gsi);
+ return irq;
+ }
+
+ pdata->irq = irq;
+ return 0;
+}
+
+static struct intel_mid_wdt_pdata tangier_pdata = {
+ .probe = tangier_probe,
+};
+
+static const struct x86_cpu_id intel_mid_cpu_ids[] = {
+ X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, &tangier_pdata),
+ {}
+};
+
+static int __init register_mid_wdt(void)
+{
+ const struct x86_cpu_id *id;
+
+ id = x86_match_cpu(intel_mid_cpu_ids);
+ if (!id)
+ return -ENODEV;
+
+ wdt_dev.dev.platform_data = (struct intel_mid_wdt_pdata *)id->driver_data;
+ return platform_device_register(&wdt_dev);
+}
+arch_initcall(register_mid_wdt);
+
+static void __exit unregister_mid_wdt(void)
+{
+ platform_device_unregister(&wdt_dev);
+}
+__exitcall(unregister_mid_wdt);