hw/misc/exynos4210_pmu: Add support for system poweroff
On all Exynos-based boards, the system powers down itself by driving PS_HOLD signal low - eight bit in PS_HOLD_CONTROL register of PMU. Handle writing to respective PMU register to fix power off failure: reboot: Power down Unable to poweroff system shutdown: 31 output lines suppressed due to ratelimiting Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000000 CPU: 0 PID: 1 Comm: shutdown Not tainted 4.11.0-rc8 #846 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [<c031050c>] (unwind_backtrace) from [<c030ba6c>] (show_stack+0x10/0x14) [<c030ba6c>] (show_stack) from [<c05b2800>] (dump_stack+0x88/0x9c) [<c05b2800>] (dump_stack) from [<c03d3140>] (panic+0xdc/0x268) [<c03d3140>] (panic) from [<c0343614>] (do_exit+0xa90/0xab4) [<c0343614>] (do_exit) from [<c035f2dc>] (SyS_reboot+0x164/0x1d0) [<c035f2dc>] (SyS_reboot) from [<c0307c80>] (ret_fast_syscall+0x0/0x3c) Additionally the initial value of PS_HOLD has to be changed because recent Linux kernel (v4.12-rc1) uses regmap cache for this access. When the register is kept at reset value, the kernel will not issue a write to it. Usually the bootloader sets the eight bit of PS_HOLD high so mimic its existence here. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -26,6 +26,7 @@
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#include "qemu/osdep.h"
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#include "hw/sysbus.h"
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#include "sysemu/sysemu.h"
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#ifndef DEBUG_PMU
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#define DEBUG_PMU 0
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@ -350,7 +351,11 @@ static const Exynos4210PmuReg exynos4210_pmu_regs[] = {
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{"PAD_RETENTION_MMCB_OPTION", PAD_RETENTION_MMCB_OPTION, 0x00000000},
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{"PAD_RETENTION_EBIA_OPTION", PAD_RETENTION_EBIA_OPTION, 0x00000000},
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{"PAD_RETENTION_EBIB_OPTION", PAD_RETENTION_EBIB_OPTION, 0x00000000},
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{"PS_HOLD_CONTROL", PS_HOLD_CONTROL, 0x00005200},
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/*
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* PS_HOLD_CONTROL: reset value and manually toggle high the DATA bit.
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* DATA bit high, set usually by bootloader, keeps system on.
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*/
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{"PS_HOLD_CONTROL", PS_HOLD_CONTROL, 0x00005200 | BIT(8)},
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{"XUSBXTI_CONFIGURATION", XUSBXTI_CONFIGURATION, 0x00000001},
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{"XUSBXTI_STATUS", XUSBXTI_STATUS, 0x00000001},
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{"XUSBXTI_DURATION", XUSBXTI_DURATION, 0xFFF00000},
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@ -397,6 +402,12 @@ typedef struct Exynos4210PmuState {
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uint32_t reg[PMU_NUM_OF_REGISTERS];
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} Exynos4210PmuState;
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static void exynos4210_pmu_poweroff(void)
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{
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PRINT_DEBUG("QEMU PMU: PS_HOLD bit down, powering off\n");
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qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
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}
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static uint64_t exynos4210_pmu_read(void *opaque, hwaddr offset,
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unsigned size)
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{
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@ -428,6 +439,13 @@ static void exynos4210_pmu_write(void *opaque, hwaddr offset,
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PRINT_DEBUG_EXTEND("%s <0x%04x> <- 0x%04x\n", reg_p->name,
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(uint32_t)offset, (uint32_t)val);
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s->reg[i] = val;
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if ((offset == PS_HOLD_CONTROL) && ((val & BIT(8)) == 0)) {
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/*
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* We are interested only in setting data bit
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* of PS_HOLD_CONTROL register to indicate power off request.
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*/
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exynos4210_pmu_poweroff();
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}
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return;
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}
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reg_p++;
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