1/*
2 * Copyright (C) 2008 Imagination Technologies
3 */
4#ifndef __METAG_HWTHREAD_H
5#define __METAG_HWTHREAD_H
6
7#include <linux/bug.h>
8#include <linux/io.h>
9
10#include <asm/metag_mem.h>
11
12#define BAD_HWTHREAD_ID		(0xFFU)
13#define BAD_CPU_ID		(0xFFU)
14
15extern u8 cpu_2_hwthread_id[];
16extern u8 hwthread_id_2_cpu[];
17
18/*
19 * Each hardware thread's Control Unit registers are memory-mapped
20 * and can therefore be accessed by any other hardware thread.
21 *
22 * This helper function returns the memory address where "thread"'s
23 * register "regnum" is mapped.
24 */
25static inline
26void __iomem *__CU_addr(unsigned int thread, unsigned int regnum)
27{
28	unsigned int base, thread_offset, thread_regnum;
29
30	WARN_ON(thread == BAD_HWTHREAD_ID);
31
32	base = T0UCTREG0;	/* Control unit base */
33
34	thread_offset = TnUCTRX_STRIDE * thread;
35	thread_regnum = TXUCTREGn_STRIDE * regnum;
36
37	return (void __iomem *)(base + thread_offset + thread_regnum);
38}
39
40#endif /* __METAG_HWTHREAD_H */
41