projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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2 | /* |
| 3 | * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
| 4 | * | |
| 6556fd1a | 5 | * Generic idle routine for 64 bits e500 processors |
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6 | */ |
| 7 | ||
| 8 | #include <linux/threads.h> | |
| 9 | #include <asm/reg.h> | |
| 10 | #include <asm/ppc_asm.h> | |
| 11 | #include <asm/asm-offsets.h> | |
| 12 | #include <asm/ppc-opcode.h> | |
| 13 | #include <asm/processor.h> | |
| 14 | #include <asm/thread_info.h> | |
| f070986a | 15 | #include <asm/epapr_hcalls.h> |
| c2e480ba | 16 | #include <asm/hw_irq.h> |
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17 | |
| 18 | /* 64-bit version only for now */ | |
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19 | .macro BOOK3E_IDLE name loop |
| 20 | _GLOBAL(\name) | |
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21 | /* Save LR for later */ |
| 22 | mflr r0 | |
| 23 | std r0,16(r1) | |
| 24 | ||
| 25 | /* Hard disable interrupts */ | |
| 26 | wrteei 0 | |
| 27 | ||
| 28 | /* Now check if an interrupt came in while we were soft disabled | |
| 7230c564 | 29 | * since we may otherwise lose it (doorbells etc...). |
| 34d97e07 | 30 | */ |
| 7230c564 | 31 | lbz r3,PACAIRQHAPPENED(r13) |
| 34d97e07 | 32 | cmpwi cr0,r3,0 |
| 9b81c021 | 33 | bne 2f |
| 34d97e07 | 34 | |
| 7230c564 | 35 | /* Now we are going to mark ourselves as soft and hard enabled in |
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36 | * order to be able to take interrupts while asleep. We inform lockdep |
| 37 | * of that. We don't actually turn interrupts on just yet tho. | |
| 38 | */ | |
| 39 | #ifdef CONFIG_TRACE_IRQFLAGS | |
| 40 | stdu r1,-128(r1) | |
| b1576fec | 41 | bl trace_hardirqs_on |
| 7230c564 | 42 | addi r1,r1,128 |
| 34d97e07 | 43 | #endif |
| c2e480ba | 44 | li r0,IRQS_ENABLED |
| 4e26bc4a | 45 | stb r0,PACAIRQSOFTMASK(r13) |
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46 | |
| 47 | /* Interrupts will make use return to LR, so get something we want | |
| 48 | * in there | |
| 49 | */ | |
| 50 | bl 1f | |
| 51 | ||
| 7230c564 | 52 | /* And return (interrupts are on) */ |
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53 | ld r0,16(r1) |
| 54 | mtlr r0 | |
| 55 | blr | |
| 56 | ||
| 57 | 1: /* Let's set the _TLF_NAPPING flag so interrupts make us return | |
| 58 | * to the right spot | |
| 59 | */ | |
| c911d2e1 | 60 | ld r11, PACACURRENT(r13) |
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61 | ld r10,TI_LOCAL_FLAGS(r11) |
| 62 | ori r10,r10,_TLF_NAPPING | |
| 63 | std r10,TI_LOCAL_FLAGS(r11) | |
| 64 | ||
| 65 | /* We can now re-enable hard interrupts and go to sleep */ | |
| 66 | wrteei 1 | |
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67 | \loop |
| 68 | ||
| 9b81c021 NP |
69 | 2: |
| 70 | lbz r10,PACAIRQHAPPENED(r13) | |
| 71 | ori r10,r10,PACA_IRQ_HARD_DIS | |
| 72 | stb r10,PACAIRQHAPPENED(r13) | |
| 73 | blr | |
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74 | .endm |
| 75 | ||
| 76 | .macro BOOK3E_IDLE_LOOP | |
| 77 | 1: | |
| dabeb572 | 78 | PPC_WAIT_v203 |
| 34d97e07 | 79 | b 1b |
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80 | .endm |
| 81 | ||
| 82 | /* epapr_ev_idle_start below is patched with the proper hcall | |
| 83 | opcodes during kernel initialization */ | |
| 84 | .macro EPAPR_EV_IDLE_LOOP | |
| 85 | idle_loop: | |
| 86 | LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) | |
| 87 | ||
| 88 | .global epapr_ev_idle_start | |
| 89 | epapr_ev_idle_start: | |
| 90 | li r3, -1 | |
| 91 | nop | |
| 92 | nop | |
| 93 | nop | |
| 94 | b idle_loop | |
| 95 | .endm | |
| 96 | ||
| 97 | BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP | |
| 98 | ||
| 6556fd1a | 99 | BOOK3E_IDLE e500_idle BOOK3E_IDLE_LOOP |