1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 2004 Cavium Networks
 7 */
 8#ifndef __ASM_MACH_CAVIUM_OCTEON_CPU_FEATURE_OVERRIDES_H
 9#define __ASM_MACH_CAVIUM_OCTEON_CPU_FEATURE_OVERRIDES_H
10
11#include <linux/types.h>
12#include <asm/mipsregs.h>
13
14/*
15 * Cavium Octeons are MIPS64v2 processors
16 */
17#define cpu_dcache_line_size()	128
18#define cpu_icache_line_size()	128
19
20
21#define cpu_has_4kex		1
22#define cpu_has_3k_cache	0
23#define cpu_has_4k_cache	0
24#define cpu_has_tx39_cache	0
25#define cpu_has_fpu		0
26#define cpu_has_counter		1
27#define cpu_has_watch		1
28#define cpu_has_divec		1
29#define cpu_has_vce		0
30#define cpu_has_cache_cdex_p	0
31#define cpu_has_cache_cdex_s	0
32#define cpu_has_prefetch	1
33
34#define cpu_has_llsc		1
35/*
36 * We Disable LL/SC on non SMP systems as it is faster to disable
37 * interrupts for atomic access than a LL/SC.
38 */
39#ifdef CONFIG_SMP
40# define kernel_uses_llsc	1
41#else
42# define kernel_uses_llsc	0
43#endif
44#define cpu_has_vtag_icache	1
45#define cpu_has_dc_aliases	0
46#define cpu_has_ic_fills_f_dc	0
47#define cpu_has_64bits		1
48#define cpu_has_octeon_cache	1
49#define cpu_has_saa		octeon_has_saa()
50#define cpu_has_mips32r1	0
51#define cpu_has_mips32r2	0
52#define cpu_has_mips64r1	0
53#define cpu_has_mips64r2	1
54#define cpu_has_mips_r2_exec_hazard 0
55#define cpu_has_dsp		0
56#define cpu_has_mipsmt		0
57#define cpu_has_vint		0
58#define cpu_has_veic		0
59#define cpu_hwrena_impl_bits	0xc0000000
60
61#define kernel_uses_smartmips_rixi (cpu_data[0].cputype != CPU_CAVIUM_OCTEON)
62
63#define ARCH_HAS_IRQ_PER_CPU	1
64#define ARCH_HAS_SPINLOCK_PREFETCH 1
65#define spin_lock_prefetch(x) prefetch(x)
66#define PREFETCH_STRIDE 128
67
68#ifdef __OCTEON__
69/*
70 * All gcc versions that have OCTEON support define __OCTEON__ and have the
71 *  __builtin_popcount support.
72 */
73#define ARCH_HAS_USABLE_BUILTIN_POPCOUNT 1
74#endif
75
76static inline int octeon_has_saa(void)
77{
78	int id;
79	asm volatile ("mfc0 %0, $15,0" : "=r" (id));
80	return id >= 0x000d0300;
81}
82
83/*
84 * The last 256MB are reserved for device to device mappings and the
85 * BAR1 hole.
86 */
87#define MAX_DMA32_PFN (((1ULL << 32) - (1ULL << 28)) >> PAGE_SHIFT)
88
89#endif