MLK-11488-1 driver: char: sema4: add sema4 support

- add linux sema4 driver.
- use volatile types in sema4 structure.
- align the port definiton a9 is 1, m4 is 2.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Richard Zhu <r65037@freescale.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/include/linux/imx_sema4.h b/include/linux/imx_sema4.h
new file mode 100644
index 000000000000..83f319f805e9
--- /dev/null
+++ b/include/linux/imx_sema4.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2014 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_IMX_SEMA4_H__
+#define __LINUX_IMX_SEMA4_H__
+
+#define SEMA4_NUM_DEVICES	1
+#define SEMA4_NUM_GATES		16
+
+#define SEMA4_UNLOCK	0x00
+#define SEMA4_A9_LOCK	0x01
+#define SEMA4_GATE_MASK	0x03
+
+#define CORE_MUTEX_VALID	(('c'<<24)|('m'<<24)|('t'<<24)|'x')
+
+/*
+ * The enumerates
+ */
+enum {
+	/* sema4 registers offset */
+	SEMA4_CP0INE	= 0x40,
+	SEMA4_CP1INE	= 0x48,
+	SEMA4_CP0NTF	= 0x80,
+	SEMA4_CP1NTF	= 0x88,
+};
+
+static const unsigned int idx_sema4[16] = {
+	1 << 7, 1 << 6, 1 << 5, 1 << 4,
+	1 << 3, 1 << 2, 1 << 1, 1 << 0,
+	1 << 15, 1 << 14, 1 << 13, 1 << 12,
+	1 << 11, 1 << 10, 1 << 9, 1 << 8,
+};
+
+struct imx_sema4_mutex {
+	u32			valid;
+	u32			gate_num;
+	unsigned char		gate_val;
+	wait_queue_head_t       wait_q;
+};
+
+struct imx_sema4_mutex_device {
+	struct device		*dev;
+	u16			cpntf_val;
+	u16			cpine_val;
+	void __iomem		*ioaddr;	/* Mapped address */
+	spinlock_t		lock;		/* Mutex */
+	int			irq;
+
+	u16			alloced;
+	struct imx_sema4_mutex	*mutex_ptr[16];
+};
+
+struct imx_sema4_mutex *
+	imx_sema4_mutex_create(u32 dev_num, u32 mutex_num);
+int imx_sema4_mutex_destroy(struct imx_sema4_mutex *mutex_ptr);
+int imx_sema4_mutex_trylock(struct imx_sema4_mutex *mutex_ptr);
+int imx_sema4_mutex_lock(struct imx_sema4_mutex *mutex_ptr);
+int imx_sema4_mutex_unlock(struct imx_sema4_mutex *mutex_ptr);
+#endif /* __LINUX_IMX_SEMA4_H__ */