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### NVME SSD Power Control Manager
#### Description
The Package is Mantain for SSD power control and related noification handle Deamon
#### Design
nvme_gpio.service for initinal related GPIOs ( PRESENT, PWR, PWRGD, RST_U2 ) and according PRESENT signal fix HW PWR default output signal.
nvme_powermanager.service loop for monitor PRESENT signal and update PWR output.
#### Process
* Plugging
1. U2_[SSD_index]PRSNT_N will be input low
2. Set PWR_U2_[SSD_index]_EN to high
3. Check PWRGD_U2_[SSD_index] is high
4-1. If PWRGD_U2_[SSD_index] is high (PWR Good)
- Wait 5ms
- Enable PCI Clock by SMBus 9FGL0851
- Wait 100ms
- Reset RST_BMC_U2 [low->high]
- Send Assert to tell package could read SSD status.
4-2. If PWRGD_U2_[SSD_index] is low (PWR Fail)
- Disable Clock by SMBus
- Wait 100ms
- Set RST_BMC_U2_[SSD_index]_R_N to low
- Set LED_U2_FAULT to high
* Removing
1. U2_[SSD_index]PRSNT_N will be input high
2. Disable Clock by SMBus 9FGL0851
3. PWR_U2_[SSD_index]_EN to low
4. Check PWRGD_U2_[SSD_index] is low
5. Send Assert to tell package update SSD status.
#### TODO
1. After power on ssd, bmc send command to 9FGL0851 (on SMBus8 0x68) for enable PCI clock, and send RST_BMC_U2 pin rsing event (set low, wait 500ms, set high). The Host could rescan PCI and detect SSD device.
#### Test
1. PRESENT detect SSD: The Default Hardware is implement.
2. Initial SSD slot Power output: nvme_gpio service has test on Module. It could sucess initial gpios and setting correct power output.
3. Detect PRESENT and change power setting: nvme_powermanager service has tested on Module. It could success detect SSD plugged or removal change PWR output.
4. NVME-MI connect: Ensure SSD power is ready then it will notify quanta NVME-MI package could read SSD information.
5. FAULT LED handle: When detect power output irregular by PWRGD pin, the service will trigger related FAULT LED.
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