projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1e57372e JH |
2 | /* |
| 3 | * Copyright (C) 2008 Imagination Technologies | |
| 4 | */ | |
| 5 | #ifndef __METAG_HWTHREAD_H | |
| 6 | #define __METAG_HWTHREAD_H | |
| 7 | ||
| 8 | #include <linux/bug.h> | |
| 9 | #include <linux/io.h> | |
| 10 | ||
| 11 | #include <asm/metag_mem.h> | |
| 12 | ||
| 13 | #define BAD_HWTHREAD_ID (0xFFU) | |
| 14 | #define BAD_CPU_ID (0xFFU) | |
| 15 | ||
| 16 | extern u8 cpu_2_hwthread_id[]; | |
| 17 | extern u8 hwthread_id_2_cpu[]; | |
| 18 | ||
| 19 | /* | |
| 20 | * Each hardware thread's Control Unit registers are memory-mapped | |
| 21 | * and can therefore be accessed by any other hardware thread. | |
| 22 | * | |
| 23 | * This helper function returns the memory address where "thread"'s | |
| 24 | * register "regnum" is mapped. | |
| 25 | */ | |
| 26 | static inline | |
| 27 | void __iomem *__CU_addr(unsigned int thread, unsigned int regnum) | |
| 28 | { | |
| 29 | unsigned int base, thread_offset, thread_regnum; | |
| 30 | ||
| 31 | WARN_ON(thread == BAD_HWTHREAD_ID); | |
| 32 | ||
| 33 | base = T0UCTREG0; /* Control unit base */ | |
| 34 | ||
| 35 | thread_offset = TnUCTRX_STRIDE * thread; | |
| 36 | thread_regnum = TXUCTREGn_STRIDE * regnum; | |
| 37 | ||
| 38 | return (void __iomem *)(base + thread_offset + thread_regnum); | |
| 39 | } | |
| 40 | ||
| 41 | #endif /* __METAG_HWTHREAD_H */ |