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1 | /* | |
2 | * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #ifndef _ASM_POWERPC_DCR_NATIVE_H | |
21 | #define _ASM_POWERPC_DCR_NATIVE_H | |
22 | #ifdef __KERNEL__ | |
23 | #ifndef __ASSEMBLY__ | |
24 | ||
25 | #include <linux/spinlock.h> | |
26 | #include <asm/cputable.h> | |
27 | ||
28 | typedef struct { | |
29 | unsigned int base; | |
30 | } dcr_host_native_t; | |
31 | ||
32 | static inline bool dcr_map_ok_native(dcr_host_native_t host) | |
33 | { | |
34 | return 1; | |
35 | } | |
36 | ||
37 | #define dcr_map_native(dev, dcr_n, dcr_c) \ | |
38 | ((dcr_host_native_t){ .base = (dcr_n) }) | |
39 | #define dcr_unmap_native(host, dcr_c) do {} while (0) | |
40 | #define dcr_read_native(host, dcr_n) mfdcr(dcr_n + host.base) | |
41 | #define dcr_write_native(host, dcr_n, value) mtdcr(dcr_n + host.base, value) | |
42 | ||
43 | /* Table based DCR accessors */ | |
44 | extern void __mtdcr(unsigned int reg, unsigned int val); | |
45 | extern unsigned int __mfdcr(unsigned int reg); | |
46 | ||
47 | /* mfdcrx/mtdcrx instruction based accessors. We hand code | |
48 | * the opcodes in order not to depend on newer binutils | |
49 | */ | |
50 | static inline unsigned int mfdcrx(unsigned int reg) | |
51 | { | |
52 | unsigned int ret; | |
53 | asm volatile(".long 0x7c000206 | (%0 << 21) | (%1 << 16)" | |
54 | : "=r" (ret) : "r" (reg)); | |
55 | return ret; | |
56 | } | |
57 | ||
58 | static inline void mtdcrx(unsigned int reg, unsigned int val) | |
59 | { | |
60 | asm volatile(".long 0x7c000306 | (%0 << 21) | (%1 << 16)" | |
61 | : : "r" (val), "r" (reg)); | |
62 | } | |
63 | ||
64 | #define mfdcr(rn) \ | |
65 | ({unsigned int rval; \ | |
66 | if (__builtin_constant_p(rn) && rn < 1024) \ | |
67 | asm volatile("mfdcr %0," __stringify(rn) \ | |
68 | : "=r" (rval)); \ | |
69 | else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR))) \ | |
70 | rval = mfdcrx(rn); \ | |
71 | else \ | |
72 | rval = __mfdcr(rn); \ | |
73 | rval;}) | |
74 | ||
75 | #define mtdcr(rn, v) \ | |
76 | do { \ | |
77 | if (__builtin_constant_p(rn) && rn < 1024) \ | |
78 | asm volatile("mtdcr " __stringify(rn) ",%0" \ | |
79 | : : "r" (v)); \ | |
80 | else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR))) \ | |
81 | mtdcrx(rn, v); \ | |
82 | else \ | |
83 | __mtdcr(rn, v); \ | |
84 | } while (0) | |
85 | ||
86 | /* R/W of indirect DCRs make use of standard naming conventions for DCRs */ | |
87 | extern spinlock_t dcr_ind_lock; | |
88 | ||
89 | static inline unsigned __mfdcri(int base_addr, int base_data, int reg) | |
90 | { | |
91 | unsigned long flags; | |
92 | unsigned int val; | |
93 | ||
94 | spin_lock_irqsave(&dcr_ind_lock, flags); | |
95 | if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) { | |
96 | mtdcrx(base_addr, reg); | |
97 | val = mfdcrx(base_data); | |
98 | } else { | |
99 | __mtdcr(base_addr, reg); | |
100 | val = __mfdcr(base_data); | |
101 | } | |
102 | spin_unlock_irqrestore(&dcr_ind_lock, flags); | |
103 | return val; | |
104 | } | |
105 | ||
106 | static inline void __mtdcri(int base_addr, int base_data, int reg, | |
107 | unsigned val) | |
108 | { | |
109 | unsigned long flags; | |
110 | ||
111 | spin_lock_irqsave(&dcr_ind_lock, flags); | |
112 | if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) { | |
113 | mtdcrx(base_addr, reg); | |
114 | mtdcrx(base_data, val); | |
115 | } else { | |
116 | __mtdcr(base_addr, reg); | |
117 | __mtdcr(base_data, val); | |
118 | } | |
119 | spin_unlock_irqrestore(&dcr_ind_lock, flags); | |
120 | } | |
121 | ||
122 | static inline void __dcri_clrset(int base_addr, int base_data, int reg, | |
123 | unsigned clr, unsigned set) | |
124 | { | |
125 | unsigned long flags; | |
126 | unsigned int val; | |
127 | ||
128 | spin_lock_irqsave(&dcr_ind_lock, flags); | |
129 | if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) { | |
130 | mtdcrx(base_addr, reg); | |
131 | val = (mfdcrx(base_data) & ~clr) | set; | |
132 | mtdcrx(base_data, val); | |
133 | } else { | |
134 | __mtdcr(base_addr, reg); | |
135 | val = (__mfdcr(base_data) & ~clr) | set; | |
136 | __mtdcr(base_data, val); | |
137 | } | |
138 | spin_unlock_irqrestore(&dcr_ind_lock, flags); | |
139 | } | |
140 | ||
141 | #define mfdcri(base, reg) __mfdcri(DCRN_ ## base ## _CONFIG_ADDR, \ | |
142 | DCRN_ ## base ## _CONFIG_DATA, \ | |
143 | reg) | |
144 | ||
145 | #define mtdcri(base, reg, data) __mtdcri(DCRN_ ## base ## _CONFIG_ADDR, \ | |
146 | DCRN_ ## base ## _CONFIG_DATA, \ | |
147 | reg, data) | |
148 | ||
149 | #define dcri_clrset(base, reg, clr, set) __dcri_clrset(DCRN_ ## base ## _CONFIG_ADDR, \ | |
150 | DCRN_ ## base ## _CONFIG_DATA, \ | |
151 | reg, clr, set) | |
152 | ||
153 | #endif /* __ASSEMBLY__ */ | |
154 | #endif /* __KERNEL__ */ | |
155 | #endif /* _ASM_POWERPC_DCR_NATIVE_H */ |