1/*
2 * arch/arm/mach-ixp4xx/include/mach/cpu.h
3 *
4 * IXP4XX cpu type detection
5 *
6 * Copyright (C) 2007 MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14#ifndef __ASM_ARCH_CPU_H__
15#define __ASM_ARCH_CPU_H__
16
17#include <linux/io.h>
18#include <asm/cputype.h>
19
20/* Processor id value in CP15 Register 0 */
21#define IXP42X_PROCESSOR_ID_VALUE	0x690541c0 /* including unused 0x690541Ex */
22#define IXP42X_PROCESSOR_ID_MASK	0xffffffc0
23
24#define IXP43X_PROCESSOR_ID_VALUE	0x69054040
25#define IXP43X_PROCESSOR_ID_MASK	0xfffffff0
26
27#define IXP46X_PROCESSOR_ID_VALUE	0x69054200 /* including IXP455 */
28#define IXP46X_PROCESSOR_ID_MASK	0xfffffff0
29
30#define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP42X_PROCESSOR_ID_MASK | 0xF)) == \
31				IXP42X_PROCESSOR_ID_VALUE)
32#define cpu_is_ixp42x()	((read_cpuid_id() & IXP42X_PROCESSOR_ID_MASK) == \
33			 IXP42X_PROCESSOR_ID_VALUE)
34#define cpu_is_ixp43x()	((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \
35			 IXP43X_PROCESSOR_ID_VALUE)
36#define cpu_is_ixp46x()	((read_cpuid_id() & IXP46X_PROCESSOR_ID_MASK) == \
37			 IXP46X_PROCESSOR_ID_VALUE)
38
39static inline u32 ixp4xx_read_feature_bits(void)
40{
41	u32 val = ~__raw_readl(IXP4XX_EXP_CFG2);
42
43	if (cpu_is_ixp42x_rev_a0())
44		return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
45					       IXP4XX_FEATURE_AES);
46	if (cpu_is_ixp42x())
47		return val & IXP42X_FEATURE_MASK;
48	if (cpu_is_ixp43x())
49		return val & IXP43X_FEATURE_MASK;
50	return val & IXP46X_FEATURE_MASK;
51}
52
53static inline void ixp4xx_write_feature_bits(u32 value)
54{
55	__raw_writel(~value, IXP4XX_EXP_CFG2);
56}
57
58#endif  /* _ASM_ARCH_CPU_H */
59