From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/blackfin/mach-bf561/coreb.c | 77 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 arch/blackfin/mach-bf561/coreb.c

(limited to 'arch/blackfin/mach-bf561/coreb.c')

diff --git a/arch/blackfin/mach-bf561/coreb.c b/arch/blackfin/mach-bf561/coreb.c
new file mode 100644
index 000000000..78ecb50ba
--- /dev/null
+++ b/arch/blackfin/mach-bf561/coreb.c
@@ -0,0 +1,77 @@
+/* Load firmware into Core B on a BF561
+ *
+ * Copyright 2004-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+/* The Core B reset func requires code in the application that is loaded into
+ * Core B.  In order to reset, the application needs to install an interrupt
+ * handler for Supplemental Interrupt 0, that sets RETI to 0xff600000 and
+ * writes bit 11 of SICB_SYSCR when bit 5 of SICA_SYSCR is 0.  This causes Core
+ * B to stall when Supplemental Interrupt 0 is set, and will reset PC to
+ * 0xff600000 when COREB_SRAM_INIT is cleared.
+ */
+
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+
+#define CMD_COREB_START		_IO('b', 0)
+#define CMD_COREB_STOP		_IO('b', 1)
+#define CMD_COREB_RESET		_IO('b', 2)
+
+static long
+coreb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int ret = 0;
+
+	switch (cmd) {
+	case CMD_COREB_START:
+		bfin_write_SYSCR(bfin_read_SYSCR() & ~0x0020);
+		break;
+	case CMD_COREB_STOP:
+		bfin_write_SYSCR(bfin_read_SYSCR() | 0x0020);
+		bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
+		break;
+	case CMD_COREB_RESET:
+		bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	CSYNC();
+
+	return ret;
+}
+
+static const struct file_operations coreb_fops = {
+	.owner          = THIS_MODULE,
+	.unlocked_ioctl = coreb_ioctl,
+	.llseek		= noop_llseek,
+};
+
+static struct miscdevice coreb_dev = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name  = "coreb",
+	.fops  = &coreb_fops,
+};
+
+static int __init bf561_coreb_init(void)
+{
+	return misc_register(&coreb_dev);
+}
+module_init(bf561_coreb_init);
+
+static void __exit bf561_coreb_exit(void)
+{
+	misc_deregister(&coreb_dev);
+}
+module_exit(bf561_coreb_exit);
+
+MODULE_AUTHOR("Bas Vermeulen <bvermeul@blackstar.xs4all.nl>");
+MODULE_DESCRIPTION("BF561 Core B Support");
+MODULE_LICENSE("GPL");
-- 
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