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linux/arch/powerpc/platforms/powernv/opal-wrappers.S
Vipin K Parashar 3b476aadbc powerpc/powernv: Add poweroff (EPOW, DPO) events support for PowerNV platform 
This patch adds support for OPAL EPOW (Environmental and Power Warnings)
and DPO (Delayed Power Off) events for the PowerNV platform. These events
are generated on FSP (Flexible Service Processor) based systems. EPOW
events are generated due to various critical system conditions that
require system shutdown. A few examples of these conditions are high
ambient temperature or system running on UPS power with low UPS battery.
DPO event is generated in response to admin initiated system shutdown
request. Upon receipt of EPOW and DPO events the host kernel invokes
orderly_poweroff() for performing graceful system shutdown.

Signed-off-by: Vipin K Parashar <vipin@linux.vnet.ibm.com>
Acked-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-07-16 13:34:36 +10:00

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/*
* PowerNV OPAL API wrappers
*
* Copyright 2011 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/jump_label.h>
#include <asm/ppc_asm.h>
#include <asm/hvcall.h>
#include <asm/asm-offsets.h>
#include <asm/opal.h>
.section ".text"
#ifdef CONFIG_TRACEPOINTS
#ifdef HAVE_JUMP_LABEL
#define OPAL_BRANCH(LABEL) \
ARCH_STATIC_BRANCH(LABEL, opal_tracepoint_key)
#else
.section ".toc","aw"
.globl opal_tracepoint_refcount
opal_tracepoint_refcount:
.llong 0
.section ".text"
/*
* We branch around this in early init by using an unconditional cpu
* feature.
*/
#define OPAL_BRANCH(LABEL) \
BEGIN_FTR_SECTION; \
b 1f; \
END_FTR_SECTION(0, 1); \
ld r12,opal_tracepoint_refcount@toc(r2); \
cmpdi r12,0; \
bne- LABEL; \
1:
#endif
#else
#define OPAL_BRANCH(LABEL)
#endif
/* TODO:
*
* - Trace irqs in/off (needs saving/restoring all args, argh...)
* - Get r11 feed up by Dave so I can have better register usage
*/
#define OPAL_CALL(name, token) \
_GLOBAL_TOC(name); \
mflr r0; \
std r0,16(r1); \
li r0,token; \
OPAL_BRANCH(opal_tracepoint_entry) \
mfcr r12; \
stw r12,8(r1); \
std r1,PACAR1(r13); \
li r11,0; \
mfmsr r12; \
ori r11,r11,MSR_EE; \
std r12,PACASAVEDMSR(r13); \
andc r12,r12,r11; \
mtmsrd r12,1; \
LOAD_REG_ADDR(r11,opal_return); \
mtlr r11; \
li r11,MSR_DR|MSR_IR|MSR_LE;\
andc r12,r12,r11; \
mtspr SPRN_HSRR1,r12; \
LOAD_REG_ADDR(r11,opal); \
ld r12,8(r11); \
ld r2,0(r11); \
mtspr SPRN_HSRR0,r12; \
hrfid
opal_return:
/*
* Fixup endian on OPAL return... we should be able to simplify
* this by instead converting the below trampoline to a set of
* bytes (always BE) since MSR:LE will end up fixed up as a side
* effect of the rfid.
*/
FIXUP_ENDIAN
ld r2,PACATOC(r13);
lwz r4,8(r1);
ld r5,16(r1);
ld r6,PACASAVEDMSR(r13);
mtspr SPRN_SRR0,r5;
mtspr SPRN_SRR1,r6;
mtcr r4;
rfid
#ifdef CONFIG_TRACEPOINTS
opal_tracepoint_entry:
stdu r1,-STACKFRAMESIZE(r1)
std r0,STK_REG(R23)(r1)
std r3,STK_REG(R24)(r1)
std r4,STK_REG(R25)(r1)
std r5,STK_REG(R26)(r1)
std r6,STK_REG(R27)(r1)
std r7,STK_REG(R28)(r1)
std r8,STK_REG(R29)(r1)
std r9,STK_REG(R30)(r1)
std r10,STK_REG(R31)(r1)
mr r3,r0
addi r4,r1,STK_REG(R24)
bl __trace_opal_entry
ld r0,STK_REG(R23)(r1)
ld r3,STK_REG(R24)(r1)
ld r4,STK_REG(R25)(r1)
ld r5,STK_REG(R26)(r1)
ld r6,STK_REG(R27)(r1)
ld r7,STK_REG(R28)(r1)
ld r8,STK_REG(R29)(r1)
ld r9,STK_REG(R30)(r1)
ld r10,STK_REG(R31)(r1)
LOAD_REG_ADDR(r11,opal_tracepoint_return)
mfcr r12
std r11,16(r1)
stw r12,8(r1)
std r1,PACAR1(r13)
li r11,0
mfmsr r12
ori r11,r11,MSR_EE
std r12,PACASAVEDMSR(r13)
andc r12,r12,r11
mtmsrd r12,1
LOAD_REG_ADDR(r11,opal_return)
mtlr r11
li r11,MSR_DR|MSR_IR|MSR_LE
andc r12,r12,r11
mtspr SPRN_HSRR1,r12
LOAD_REG_ADDR(r11,opal)
ld r12,8(r11)
ld r2,0(r11)
mtspr SPRN_HSRR0,r12
hrfid
opal_tracepoint_return:
std r3,STK_REG(R31)(r1)
mr r4,r3
ld r0,STK_REG(R23)(r1)
bl __trace_opal_exit
ld r3,STK_REG(R31)(r1)
addi r1,r1,STACKFRAMESIZE
ld r0,16(r1)
mtlr r0
blr
#endif
/*
* Make opal call in realmode. This is a generic function to be called
* from realmode. It handles endianness.
*
* r13 - paca pointer
* r1 - stack pointer
* r0 - opal token
*/
_GLOBAL(opal_call_realmode)
mflr r12
std r12,PPC_LR_STKOFF(r1)
ld r2,PACATOC(r13)
/* Set opal return address */
LOAD_REG_ADDR(r12,return_from_opal_call)
mtlr r12
mfmsr r12
#ifdef __LITTLE_ENDIAN__
/* Handle endian-ness */
li r11,MSR_LE
andc r12,r12,r11
#endif
mtspr SPRN_HSRR1,r12
LOAD_REG_ADDR(r11,opal)
ld r12,8(r11)
ld r2,0(r11)
mtspr SPRN_HSRR0,r12
hrfid
return_from_opal_call:
#ifdef __LITTLE_ENDIAN__
FIXUP_ENDIAN
#endif
ld r12,PPC_LR_STKOFF(r1)
mtlr r12
blr
OPAL_CALL(opal_invalid_call, OPAL_INVALID_CALL);
OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE);
OPAL_CALL(opal_rtc_read, OPAL_RTC_READ);
OPAL_CALL(opal_rtc_write, OPAL_RTC_WRITE);
OPAL_CALL(opal_cec_power_down, OPAL_CEC_POWER_DOWN);
OPAL_CALL(opal_cec_reboot, OPAL_CEC_REBOOT);
OPAL_CALL(opal_read_nvram, OPAL_READ_NVRAM);
OPAL_CALL(opal_write_nvram, OPAL_WRITE_NVRAM);
OPAL_CALL(opal_handle_interrupt, OPAL_HANDLE_INTERRUPT);
OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS);
OPAL_CALL(opal_pci_set_hub_tce_memory, OPAL_PCI_SET_HUB_TCE_MEMORY);
OPAL_CALL(opal_pci_set_phb_tce_memory, OPAL_PCI_SET_PHB_TCE_MEMORY);
OPAL_CALL(opal_pci_config_read_byte, OPAL_PCI_CONFIG_READ_BYTE);
OPAL_CALL(opal_pci_config_read_half_word, OPAL_PCI_CONFIG_READ_HALF_WORD);
OPAL_CALL(opal_pci_config_read_word, OPAL_PCI_CONFIG_READ_WORD);
OPAL_CALL(opal_pci_config_write_byte, OPAL_PCI_CONFIG_WRITE_BYTE);
OPAL_CALL(opal_pci_config_write_half_word, OPAL_PCI_CONFIG_WRITE_HALF_WORD);
OPAL_CALL(opal_pci_config_write_word, OPAL_PCI_CONFIG_WRITE_WORD);
OPAL_CALL(opal_set_xive, OPAL_SET_XIVE);
OPAL_CALL(opal_get_xive, OPAL_GET_XIVE);
OPAL_CALL(opal_register_exception_handler, OPAL_REGISTER_OPAL_EXCEPTION_HANDLER);
OPAL_CALL(opal_pci_eeh_freeze_status, OPAL_PCI_EEH_FREEZE_STATUS);
OPAL_CALL(opal_pci_eeh_freeze_clear, OPAL_PCI_EEH_FREEZE_CLEAR);
OPAL_CALL(opal_pci_eeh_freeze_set, OPAL_PCI_EEH_FREEZE_SET);
OPAL_CALL(opal_pci_err_inject, OPAL_PCI_ERR_INJECT);
OPAL_CALL(opal_pci_shpc, OPAL_PCI_SHPC);
OPAL_CALL(opal_pci_phb_mmio_enable, OPAL_PCI_PHB_MMIO_ENABLE);
OPAL_CALL(opal_pci_set_phb_mem_window, OPAL_PCI_SET_PHB_MEM_WINDOW);
OPAL_CALL(opal_pci_map_pe_mmio_window, OPAL_PCI_MAP_PE_MMIO_WINDOW);
OPAL_CALL(opal_pci_set_phb_table_memory, OPAL_PCI_SET_PHB_TABLE_MEMORY);
OPAL_CALL(opal_pci_set_pe, OPAL_PCI_SET_PE);
OPAL_CALL(opal_pci_set_peltv, OPAL_PCI_SET_PELTV);
OPAL_CALL(opal_pci_set_mve, OPAL_PCI_SET_MVE);
OPAL_CALL(opal_pci_set_mve_enable, OPAL_PCI_SET_MVE_ENABLE);
OPAL_CALL(opal_pci_get_xive_reissue, OPAL_PCI_GET_XIVE_REISSUE);
OPAL_CALL(opal_pci_set_xive_reissue, OPAL_PCI_SET_XIVE_REISSUE);
OPAL_CALL(opal_pci_set_xive_pe, OPAL_PCI_SET_XIVE_PE);
OPAL_CALL(opal_get_xive_source, OPAL_GET_XIVE_SOURCE);
OPAL_CALL(opal_get_msi_32, OPAL_GET_MSI_32);
OPAL_CALL(opal_get_msi_64, OPAL_GET_MSI_64);
OPAL_CALL(opal_start_cpu, OPAL_START_CPU);
OPAL_CALL(opal_query_cpu_status, OPAL_QUERY_CPU_STATUS);
OPAL_CALL(opal_write_oppanel, OPAL_WRITE_OPPANEL);
OPAL_CALL(opal_pci_map_pe_dma_window, OPAL_PCI_MAP_PE_DMA_WINDOW);
OPAL_CALL(opal_pci_map_pe_dma_window_real, OPAL_PCI_MAP_PE_DMA_WINDOW_REAL);
OPAL_CALL(opal_pci_reset, OPAL_PCI_RESET);
OPAL_CALL(opal_pci_get_hub_diag_data, OPAL_PCI_GET_HUB_DIAG_DATA);
OPAL_CALL(opal_pci_get_phb_diag_data, OPAL_PCI_GET_PHB_DIAG_DATA);
OPAL_CALL(opal_pci_fence_phb, OPAL_PCI_FENCE_PHB);
OPAL_CALL(opal_pci_reinit, OPAL_PCI_REINIT);
OPAL_CALL(opal_pci_mask_pe_error, OPAL_PCI_MASK_PE_ERROR);
OPAL_CALL(opal_set_slot_led_status, OPAL_SET_SLOT_LED_STATUS);
OPAL_CALL(opal_get_epow_status, OPAL_GET_EPOW_STATUS);
OPAL_CALL(opal_get_dpo_status, OPAL_GET_DPO_STATUS);
OPAL_CALL(opal_set_system_attention_led, OPAL_SET_SYSTEM_ATTENTION_LED);
OPAL_CALL(opal_pci_next_error, OPAL_PCI_NEXT_ERROR);
OPAL_CALL(opal_pci_poll, OPAL_PCI_POLL);
OPAL_CALL(opal_pci_msi_eoi, OPAL_PCI_MSI_EOI);
OPAL_CALL(opal_pci_get_phb_diag_data2, OPAL_PCI_GET_PHB_DIAG_DATA2);
OPAL_CALL(opal_xscom_read, OPAL_XSCOM_READ);
OPAL_CALL(opal_xscom_write, OPAL_XSCOM_WRITE);
OPAL_CALL(opal_lpc_read, OPAL_LPC_READ);
OPAL_CALL(opal_lpc_write, OPAL_LPC_WRITE);
OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU);
OPAL_CALL(opal_reinit_cpus, OPAL_REINIT_CPUS);
OPAL_CALL(opal_read_elog, OPAL_ELOG_READ);
OPAL_CALL(opal_send_ack_elog, OPAL_ELOG_ACK);
OPAL_CALL(opal_get_elog_size, OPAL_ELOG_SIZE);
OPAL_CALL(opal_resend_pending_logs, OPAL_ELOG_RESEND);
OPAL_CALL(opal_write_elog, OPAL_ELOG_WRITE);
OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE);
OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE);
OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE);
OPAL_CALL(opal_resync_timebase, OPAL_RESYNC_TIMEBASE);
OPAL_CALL(opal_check_token, OPAL_CHECK_TOKEN);
OPAL_CALL(opal_dump_init, OPAL_DUMP_INIT);
OPAL_CALL(opal_dump_info, OPAL_DUMP_INFO);
OPAL_CALL(opal_dump_info2, OPAL_DUMP_INFO2);
OPAL_CALL(opal_dump_read, OPAL_DUMP_READ);
OPAL_CALL(opal_dump_ack, OPAL_DUMP_ACK);
OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
OPAL_CALL(opal_dump_resend_notification, OPAL_DUMP_RESEND);
OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);
OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
OPAL_CALL(opal_handle_hmi, OPAL_HANDLE_HMI);
OPAL_CALL(opal_config_cpu_idle_state, OPAL_CONFIG_CPU_IDLE_STATE);
OPAL_CALL(opal_slw_set_reg, OPAL_SLW_SET_REG);
OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION);
OPAL_CALL(opal_unregister_dump_region, OPAL_UNREGISTER_DUMP_REGION);
OPAL_CALL(opal_pci_set_phb_cxl_mode, OPAL_PCI_SET_PHB_CAPI_MODE);
OPAL_CALL(opal_tpo_write, OPAL_WRITE_TPO);
OPAL_CALL(opal_tpo_read, OPAL_READ_TPO);
OPAL_CALL(opal_ipmi_send, OPAL_IPMI_SEND);
OPAL_CALL(opal_ipmi_recv, OPAL_IPMI_RECV);
OPAL_CALL(opal_i2c_request, OPAL_I2C_REQUEST);
OPAL_CALL(opal_flash_read, OPAL_FLASH_READ);
OPAL_CALL(opal_flash_write, OPAL_FLASH_WRITE);
OPAL_CALL(opal_flash_erase, OPAL_FLASH_ERASE);
OPAL_CALL(opal_prd_msg, OPAL_PRD_MSG);
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