1 /* 2 * Copyright (C) 2013 Imagination Technologies 3 * Author: Paul Burton <paul.burton@imgtec.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 */ 10 11 #ifndef __MIPS_ASM_MIPS_CPC_H__ 12 #define __MIPS_ASM_MIPS_CPC_H__ 13 14 #include <linux/io.h> 15 #include <linux/types.h> 16 17 /* The base address of the CPC registers */ 18 extern void __iomem *mips_cpc_base; 19 20 /** 21 * mips_cpc_default_phys_base - retrieve the default physical base address of 22 * the CPC 23 * 24 * Returns the default physical base address of the Cluster Power Controller 25 * memory mapped registers. This is platform dependant & must therefore be 26 * implemented per-platform. 27 */ 28 extern phys_addr_t mips_cpc_default_phys_base(void); 29 30 /** 31 * mips_cpc_phys_base - retrieve the physical base address of the CPC 32 * 33 * This function returns the physical base address of the Cluster Power 34 * Controller memory mapped registers, or 0 if no Cluster Power Controller 35 * is present. It may be overriden by individual platforms which determine 36 * this address in a different way. 37 */ 38 extern phys_addr_t __weak mips_cpc_phys_base(void); 39 40 /** 41 * mips_cpc_probe - probe for a Cluster Power Controller 42 * 43 * Attempt to detect the presence of a Cluster Power Controller. Returns 0 if 44 * a CPC is successfully detected, else -errno. 45 */ 46 #ifdef CONFIG_MIPS_CPC 47 extern int mips_cpc_probe(void); 48 #else 49 static inline int mips_cpc_probe(void) 50 { 51 return -ENODEV; 52 } 53 #endif 54 55 /** 56 * mips_cpc_present - determine whether a Cluster Power Controller is present 57 * 58 * Returns true if a CPC is present in the system, else false. 59 */ 60 static inline bool mips_cpc_present(void) 61 { 62 #ifdef CONFIG_MIPS_CPC 63 return mips_cpc_base != NULL; 64 #else 65 return false; 66 #endif 67 } 68 69 /* Offsets from the CPC base address to various control blocks */ 70 #define MIPS_CPC_GCB_OFS 0x0000 71 #define MIPS_CPC_CLCB_OFS 0x2000 72 #define MIPS_CPC_COCB_OFS 0x4000 73 74 /* Macros to ease the creation of register access functions */ 75 #define BUILD_CPC_R_(name, off) \ 76 static inline u32 *addr_cpc_##name(void) \ 77 { \ 78 return (u32 *)(mips_cpc_base + (off)); \ 79 } \ 80 \ 81 static inline u32 read_cpc_##name(void) \ 82 { \ 83 return __raw_readl(mips_cpc_base + (off)); \ 84 } 85 86 #define BUILD_CPC__W(name, off) \ 87 static inline void write_cpc_##name(u32 value) \ 88 { \ 89 __raw_writel(value, mips_cpc_base + (off)); \ 90 } 91 92 #define BUILD_CPC_RW(name, off) \ 93 BUILD_CPC_R_(name, off) \ 94 BUILD_CPC__W(name, off) 95 96 #define BUILD_CPC_Cx_R_(name, off) \ 97 BUILD_CPC_R_(cl_##name, MIPS_CPC_CLCB_OFS + (off)) \ 98 BUILD_CPC_R_(co_##name, MIPS_CPC_COCB_OFS + (off)) 99 100 #define BUILD_CPC_Cx__W(name, off) \ 101 BUILD_CPC__W(cl_##name, MIPS_CPC_CLCB_OFS + (off)) \ 102 BUILD_CPC__W(co_##name, MIPS_CPC_COCB_OFS + (off)) 103 104 #define BUILD_CPC_Cx_RW(name, off) \ 105 BUILD_CPC_Cx_R_(name, off) \ 106 BUILD_CPC_Cx__W(name, off) 107 108 /* GCB register accessor functions */ 109 BUILD_CPC_RW(access, MIPS_CPC_GCB_OFS + 0x00) 110 BUILD_CPC_RW(seqdel, MIPS_CPC_GCB_OFS + 0x08) 111 BUILD_CPC_RW(rail, MIPS_CPC_GCB_OFS + 0x10) 112 BUILD_CPC_RW(resetlen, MIPS_CPC_GCB_OFS + 0x18) 113 BUILD_CPC_R_(revision, MIPS_CPC_GCB_OFS + 0x20) 114 115 /* Core Local & Core Other accessor functions */ 116 BUILD_CPC_Cx_RW(cmd, 0x00) 117 BUILD_CPC_Cx_RW(stat_conf, 0x08) 118 BUILD_CPC_Cx_RW(other, 0x10) 119 120 /* CPC_Cx_CMD register fields */ 121 #define CPC_Cx_CMD_SHF 0 122 #define CPC_Cx_CMD_MSK (_ULCAST_(0xf) << 0) 123 #define CPC_Cx_CMD_CLOCKOFF (_ULCAST_(0x1) << 0) 124 #define CPC_Cx_CMD_PWRDOWN (_ULCAST_(0x2) << 0) 125 #define CPC_Cx_CMD_PWRUP (_ULCAST_(0x3) << 0) 126 #define CPC_Cx_CMD_RESET (_ULCAST_(0x4) << 0) 127 128 /* CPC_Cx_STAT_CONF register fields */ 129 #define CPC_Cx_STAT_CONF_PWRUPE_SHF 23 130 #define CPC_Cx_STAT_CONF_PWRUPE_MSK (_ULCAST_(0x1) << 23) 131 #define CPC_Cx_STAT_CONF_SEQSTATE_SHF 19 132 #define CPC_Cx_STAT_CONF_SEQSTATE_MSK (_ULCAST_(0xf) << 19) 133 #define CPC_Cx_STAT_CONF_SEQSTATE_D0 (_ULCAST_(0x0) << 19) 134 #define CPC_Cx_STAT_CONF_SEQSTATE_U0 (_ULCAST_(0x1) << 19) 135 #define CPC_Cx_STAT_CONF_SEQSTATE_U1 (_ULCAST_(0x2) << 19) 136 #define CPC_Cx_STAT_CONF_SEQSTATE_U2 (_ULCAST_(0x3) << 19) 137 #define CPC_Cx_STAT_CONF_SEQSTATE_U3 (_ULCAST_(0x4) << 19) 138 #define CPC_Cx_STAT_CONF_SEQSTATE_U4 (_ULCAST_(0x5) << 19) 139 #define CPC_Cx_STAT_CONF_SEQSTATE_U5 (_ULCAST_(0x6) << 19) 140 #define CPC_Cx_STAT_CONF_SEQSTATE_U6 (_ULCAST_(0x7) << 19) 141 #define CPC_Cx_STAT_CONF_SEQSTATE_D1 (_ULCAST_(0x8) << 19) 142 #define CPC_Cx_STAT_CONF_SEQSTATE_D3 (_ULCAST_(0x9) << 19) 143 #define CPC_Cx_STAT_CONF_SEQSTATE_D2 (_ULCAST_(0xa) << 19) 144 #define CPC_Cx_STAT_CONF_CLKGAT_IMPL_SHF 17 145 #define CPC_Cx_STAT_CONF_CLKGAT_IMPL_MSK (_ULCAST_(0x1) << 17) 146 #define CPC_Cx_STAT_CONF_PWRDN_IMPL_SHF 16 147 #define CPC_Cx_STAT_CONF_PWRDN_IMPL_MSK (_ULCAST_(0x1) << 16) 148 #define CPC_Cx_STAT_CONF_EJTAG_PROBE_SHF 15 149 #define CPC_Cx_STAT_CONF_EJTAG_PROBE_MSK (_ULCAST_(0x1) << 15) 150 151 /* CPC_Cx_OTHER register fields */ 152 #define CPC_Cx_OTHER_CORENUM_SHF 16 153 #define CPC_Cx_OTHER_CORENUM_MSK (_ULCAST_(0xff) << 16) 154 155 #ifdef CONFIG_MIPS_CPC 156 157 /** 158 * mips_cpc_lock_other - lock access to another core 159 * core: the other core to be accessed 160 * 161 * Call before operating upon a core via the 'other' register region in 162 * order to prevent the region being moved during access. Must be followed 163 * by a call to mips_cpc_unlock_other. 164 */ 165 extern void mips_cpc_lock_other(unsigned int core); 166 167 /** 168 * mips_cpc_unlock_other - unlock access to another core 169 * 170 * Call after operating upon another core via the 'other' register region. 171 * Must be called after mips_cpc_lock_other. 172 */ 173 extern void mips_cpc_unlock_other(void); 174 175 #else /* !CONFIG_MIPS_CPC */ 176 177 static inline void mips_cpc_lock_other(unsigned int core) { } 178 static inline void mips_cpc_unlock_other(void) { } 179 180 #endif /* !CONFIG_MIPS_CPC */ 181 182 #endif /* __MIPS_ASM_MIPS_CPC_H__ */ 183