1/*
2 * Copyright 2004-2009 Analog Devices Inc.
3 *
4 * Licensed under the GPL-2 or later.
5 */
6
7#ifndef __ASM_BFIN_PROCESSOR_H
8#define __ASM_BFIN_PROCESSOR_H
9
10/*
11 * Default implementation of macro that returns current
12 * instruction pointer ("program counter").
13 */
14#define current_text_addr() ({ __label__ _l; _l: &&_l;})
15
16#include <asm/ptrace.h>
17#include <mach/blackfin.h>
18
19static inline unsigned long rdusp(void)
20{
21	unsigned long usp;
22
23	__asm__ __volatile__("%0 = usp;\n\t":"=da"(usp));
24	return usp;
25}
26
27static inline void wrusp(unsigned long usp)
28{
29	__asm__ __volatile__("usp = %0;\n\t"::"da"(usp));
30}
31
32static inline unsigned long __get_SP(void)
33{
34	unsigned long sp;
35
36	__asm__ __volatile__("%0 = sp;\n\t" : "=da"(sp));
37	return sp;
38}
39
40/*
41 * User space process size: 1st byte beyond user address space.
42 * Fairly meaningless on nommu.  Parts of user programs can be scattered
43 * in a lot of places, so just disable this by setting it to 0xFFFFFFFF.
44 */
45#define TASK_SIZE	0xFFFFFFFF
46
47#ifdef __KERNEL__
48#define STACK_TOP	TASK_SIZE
49#endif
50
51#define TASK_UNMAPPED_BASE	0
52
53struct thread_struct {
54	unsigned long ksp;	/* kernel stack pointer */
55	unsigned long usp;	/* user stack pointer */
56	unsigned short seqstat;	/* saved status register */
57	unsigned long esp0;	/* points to SR of stack frame pt_regs */
58	unsigned long pc;	/* instruction pointer */
59	void *        debuggerinfo;
60};
61
62#define INIT_THREAD  {						\
63	sizeof(init_stack) + (unsigned long) init_stack, 0,	\
64	PS_S, 0, 0						\
65}
66
67extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
68					       unsigned long new_sp);
69
70/* Forward declaration, a strange C thing */
71struct task_struct;
72
73/* Free all resources held by a thread. */
74static inline void release_thread(struct task_struct *dead_task)
75{
76}
77
78/*
79 * Free current thread data structures etc..
80 */
81static inline void exit_thread(void)
82{
83}
84
85/*
86 * Return saved PC of a blocked thread.
87 */
88#define thread_saved_pc(tsk)	(tsk->thread.pc)
89
90unsigned long get_wchan(struct task_struct *p);
91
92#define	KSTK_EIP(tsk)							\
93    ({									\
94	unsigned long eip = 0;						\
95	if ((tsk)->thread.esp0 > PAGE_SIZE &&				\
96	    MAP_NR((tsk)->thread.esp0) < max_mapnr)			\
97	      eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc;	\
98	eip; })
99#define	KSTK_ESP(tsk)	((tsk) == current ? rdusp() : (tsk)->thread.usp)
100
101#define cpu_relax()    	smp_mb()
102#define cpu_relax_lowlatency() cpu_relax()
103
104/* Get the Silicon Revision of the chip */
105static inline uint32_t __pure bfin_revid(void)
106{
107	/* Always use CHIPID, to work around ANOMALY_05000234 */
108	uint32_t revid = (bfin_read_CHIPID() & CHIPID_VERSION) >> 28;
109
110#ifdef _BOOTROM_GET_DXE_ADDRESS_TWI
111	/*
112	 * ANOMALY_05000364
113	 * Incorrect Revision Number in DSPID Register
114	 */
115	if (ANOMALY_05000364 &&
116	    bfin_read16(_BOOTROM_GET_DXE_ADDRESS_TWI) == 0x2796)
117		revid = 1;
118#endif
119
120	return revid;
121}
122
123static inline uint16_t __pure bfin_cpuid(void)
124{
125	return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
126}
127
128static inline uint32_t __pure bfin_dspid(void)
129{
130	return bfin_read_DSPID();
131}
132
133#define blackfin_core_id() (bfin_dspid() & 0xff)
134
135static inline uint32_t __pure bfin_compiled_revid(void)
136{
137#if defined(CONFIG_BF_REV_0_0)
138	return 0;
139#elif defined(CONFIG_BF_REV_0_1)
140	return 1;
141#elif defined(CONFIG_BF_REV_0_2)
142	return 2;
143#elif defined(CONFIG_BF_REV_0_3)
144	return 3;
145#elif defined(CONFIG_BF_REV_0_4)
146	return 4;
147#elif defined(CONFIG_BF_REV_0_5)
148	return 5;
149#elif defined(CONFIG_BF_REV_0_6)
150	return 6;
151#elif defined(CONFIG_BF_REV_ANY)
152	return 0xffff;
153#else
154	return -1;
155#endif
156}
157
158#endif
159