Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 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__ |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 23 | #ifndef __ASSEMBLY__ |
Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 24 | |
Benjamin Herrenschmidt | 0e6140a | 2007-12-21 15:39:22 +1100 | [diff] [blame] | 25 | #include <linux/spinlock.h> |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 26 | #include <asm/cputable.h> |
Kevin Hao | b92a226 | 2016-07-23 14:42:40 +0530 | [diff] [blame] | 27 | #include <asm/cpu_has_feature.h> |
Benjamin Herrenschmidt | 0e6140a | 2007-12-21 15:39:22 +1100 | [diff] [blame] | 28 | |
Michael Ellerman | 0b94a1e | 2007-09-17 16:05:00 +1000 | [diff] [blame] | 29 | typedef struct { |
| 30 | unsigned int base; |
Stephen Neuendorffer | b786af1 | 2008-05-07 04:29:17 +1000 | [diff] [blame] | 31 | } dcr_host_native_t; |
Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 32 | |
Stephen Neuendorffer | b786af1 | 2008-05-07 04:29:17 +1000 | [diff] [blame] | 33 | static inline bool dcr_map_ok_native(dcr_host_native_t host) |
| 34 | { |
Joe Perches | acdb668 | 2015-03-30 16:46:04 -0700 | [diff] [blame] | 35 | return true; |
Stephen Neuendorffer | b786af1 | 2008-05-07 04:29:17 +1000 | [diff] [blame] | 36 | } |
Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 37 | |
Stephen Neuendorffer | b786af1 | 2008-05-07 04:29:17 +1000 | [diff] [blame] | 38 | #define dcr_map_native(dev, dcr_n, dcr_c) \ |
| 39 | ((dcr_host_native_t){ .base = (dcr_n) }) |
| 40 | #define dcr_unmap_native(host, dcr_c) do {} while (0) |
| 41 | #define dcr_read_native(host, dcr_n) mfdcr(dcr_n + host.base) |
| 42 | #define dcr_write_native(host, dcr_n, value) mtdcr(dcr_n + host.base, value) |
Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 43 | |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 44 | /* Table based DCR accessors */ |
| 45 | extern void __mtdcr(unsigned int reg, unsigned int val); |
| 46 | extern unsigned int __mfdcr(unsigned int reg); |
| 47 | |
| 48 | /* mfdcrx/mtdcrx instruction based accessors. We hand code |
| 49 | * the opcodes in order not to depend on newer binutils |
| 50 | */ |
| 51 | static inline unsigned int mfdcrx(unsigned int reg) |
| 52 | { |
| 53 | unsigned int ret; |
| 54 | asm volatile(".long 0x7c000206 | (%0 << 21) | (%1 << 16)" |
| 55 | : "=r" (ret) : "r" (reg)); |
| 56 | return ret; |
| 57 | } |
| 58 | |
| 59 | static inline void mtdcrx(unsigned int reg, unsigned int val) |
| 60 | { |
| 61 | asm volatile(".long 0x7c000306 | (%0 << 21) | (%1 << 16)" |
| 62 | : : "r" (val), "r" (reg)); |
| 63 | } |
| 64 | |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 65 | #define mfdcr(rn) \ |
| 66 | ({unsigned int rval; \ |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 67 | if (__builtin_constant_p(rn) && rn < 1024) \ |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 68 | asm volatile("mfdcr %0," __stringify(rn) \ |
| 69 | : "=r" (rval)); \ |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 70 | else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR))) \ |
| 71 | rval = mfdcrx(rn); \ |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 72 | else \ |
| 73 | rval = __mfdcr(rn); \ |
| 74 | rval;}) |
Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 75 | |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 76 | #define mtdcr(rn, v) \ |
| 77 | do { \ |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 78 | if (__builtin_constant_p(rn) && rn < 1024) \ |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 79 | asm volatile("mtdcr " __stringify(rn) ",%0" \ |
| 80 | : : "r" (v)); \ |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 81 | else if (likely(cpu_has_feature(CPU_FTR_INDEXED_DCR))) \ |
| 82 | mtdcrx(rn, v); \ |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 83 | else \ |
| 84 | __mtdcr(rn, v); \ |
| 85 | } while (0) |
| 86 | |
| 87 | /* R/W of indirect DCRs make use of standard naming conventions for DCRs */ |
Benjamin Herrenschmidt | 0e6140a | 2007-12-21 15:39:22 +1100 | [diff] [blame] | 88 | extern spinlock_t dcr_ind_lock; |
| 89 | |
Valentine Barshak | e8318d9 | 2008-02-06 05:36:49 +1100 | [diff] [blame] | 90 | static inline unsigned __mfdcri(int base_addr, int base_data, int reg) |
| 91 | { |
| 92 | unsigned long flags; |
| 93 | unsigned int val; |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 94 | |
Valentine Barshak | e8318d9 | 2008-02-06 05:36:49 +1100 | [diff] [blame] | 95 | spin_lock_irqsave(&dcr_ind_lock, flags); |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 96 | if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) { |
| 97 | mtdcrx(base_addr, reg); |
| 98 | val = mfdcrx(base_data); |
| 99 | } else { |
| 100 | __mtdcr(base_addr, reg); |
| 101 | val = __mfdcr(base_data); |
| 102 | } |
Valentine Barshak | e8318d9 | 2008-02-06 05:36:49 +1100 | [diff] [blame] | 103 | spin_unlock_irqrestore(&dcr_ind_lock, flags); |
| 104 | return val; |
| 105 | } |
| 106 | |
| 107 | static inline void __mtdcri(int base_addr, int base_data, int reg, |
| 108 | unsigned val) |
| 109 | { |
| 110 | unsigned long flags; |
| 111 | |
| 112 | spin_lock_irqsave(&dcr_ind_lock, flags); |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 113 | if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) { |
| 114 | mtdcrx(base_addr, reg); |
| 115 | mtdcrx(base_data, val); |
| 116 | } else { |
| 117 | __mtdcr(base_addr, reg); |
| 118 | __mtdcr(base_data, val); |
| 119 | } |
Valentine Barshak | e8318d9 | 2008-02-06 05:36:49 +1100 | [diff] [blame] | 120 | spin_unlock_irqrestore(&dcr_ind_lock, flags); |
| 121 | } |
| 122 | |
Valentine Barshak | 266d028 | 2008-03-06 05:38:04 +1100 | [diff] [blame] | 123 | static inline void __dcri_clrset(int base_addr, int base_data, int reg, |
| 124 | unsigned clr, unsigned set) |
| 125 | { |
| 126 | unsigned long flags; |
| 127 | unsigned int val; |
| 128 | |
| 129 | spin_lock_irqsave(&dcr_ind_lock, flags); |
Benjamin Herrenschmidt | 6d2170b | 2008-12-18 19:13:22 +0000 | [diff] [blame] | 130 | if (cpu_has_feature(CPU_FTR_INDEXED_DCR)) { |
| 131 | mtdcrx(base_addr, reg); |
| 132 | val = (mfdcrx(base_data) & ~clr) | set; |
| 133 | mtdcrx(base_data, val); |
| 134 | } else { |
| 135 | __mtdcr(base_addr, reg); |
| 136 | val = (__mfdcr(base_data) & ~clr) | set; |
| 137 | __mtdcr(base_data, val); |
| 138 | } |
Valentine Barshak | 266d028 | 2008-03-06 05:38:04 +1100 | [diff] [blame] | 139 | spin_unlock_irqrestore(&dcr_ind_lock, flags); |
| 140 | } |
| 141 | |
Valentine Barshak | e8318d9 | 2008-02-06 05:36:49 +1100 | [diff] [blame] | 142 | #define mfdcri(base, reg) __mfdcri(DCRN_ ## base ## _CONFIG_ADDR, \ |
| 143 | DCRN_ ## base ## _CONFIG_DATA, \ |
| 144 | reg) |
| 145 | |
| 146 | #define mtdcri(base, reg, data) __mtdcri(DCRN_ ## base ## _CONFIG_ADDR, \ |
| 147 | DCRN_ ## base ## _CONFIG_DATA, \ |
| 148 | reg, data) |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 149 | |
Valentine Barshak | 266d028 | 2008-03-06 05:38:04 +1100 | [diff] [blame] | 150 | #define dcri_clrset(base, reg, clr, set) __dcri_clrset(DCRN_ ## base ## _CONFIG_ADDR, \ |
| 151 | DCRN_ ## base ## _CONFIG_DATA, \ |
| 152 | reg, clr, set) |
| 153 | |
Kumar Gala | 45d8e7a | 2006-12-10 23:15:47 -0600 | [diff] [blame] | 154 | #endif /* __ASSEMBLY__ */ |
Benjamin Herrenschmidt | 4c75a6f | 2006-11-11 17:24:53 +1100 | [diff] [blame] | 155 | #endif /* __KERNEL__ */ |
| 156 | #endif /* _ASM_POWERPC_DCR_NATIVE_H */ |