1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/mach-ixp4xx/include/mach/cpu.h
4 *
5 * IXP4XX cpu type detection
6 *
7 * Copyright (C) 2007 MontaVista Software, Inc.
8 */
9
10#ifndef __ASM_ARCH_CPU_H__
11#define __ASM_ARCH_CPU_H__
12
13#include <linux/io.h>
14#include <asm/cputype.h>
15
16/* Processor id value in CP15 Register 0 */
17#define IXP42X_PROCESSOR_ID_VALUE	0x690541c0 /* including unused 0x690541Ex */
18#define IXP42X_PROCESSOR_ID_MASK	0xffffffc0
19
20#define IXP43X_PROCESSOR_ID_VALUE	0x69054040
21#define IXP43X_PROCESSOR_ID_MASK	0xfffffff0
22
23#define IXP46X_PROCESSOR_ID_VALUE	0x69054200 /* including IXP455 */
24#define IXP46X_PROCESSOR_ID_MASK	0xfffffff0
25
26#define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP42X_PROCESSOR_ID_MASK | 0xF)) == \
27				IXP42X_PROCESSOR_ID_VALUE)
28#define cpu_is_ixp42x()	((read_cpuid_id() & IXP42X_PROCESSOR_ID_MASK) == \
29			 IXP42X_PROCESSOR_ID_VALUE)
30#define cpu_is_ixp43x()	((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \
31			 IXP43X_PROCESSOR_ID_VALUE)
32#define cpu_is_ixp46x()	((read_cpuid_id() & IXP46X_PROCESSOR_ID_MASK) == \
33			 IXP46X_PROCESSOR_ID_VALUE)
34
35static inline u32 ixp4xx_read_feature_bits(void)
36{
37	u32 val = ~__raw_readl(IXP4XX_EXP_CFG2);
38
39	if (cpu_is_ixp42x_rev_a0())
40		return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
41					       IXP4XX_FEATURE_AES);
42	if (cpu_is_ixp42x())
43		return val & IXP42X_FEATURE_MASK;
44	if (cpu_is_ixp43x())
45		return val & IXP43X_FEATURE_MASK;
46	return val & IXP46X_FEATURE_MASK;
47}
48
49static inline void ixp4xx_write_feature_bits(u32 value)
50{
51	__raw_writel(~value, IXP4XX_EXP_CFG2);
52}
53
54#endif  /* _ASM_ARCH_CPU_H */
55