JP3231719B2 - PCI hot plug controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a PCI (Prog)
rammableCommunicationsI
In a system using an interface bus, P
P for hot plug control of CI hot plug slot
The present invention relates to a CI hot plug control device.

[0002]

2. Description of the Related Art The prior art disclosed in Japanese Patent Application Laid-Open No. 10-116206 is provided with a switch means for electrically connecting a bus and a connector, and an eject switch for electrically separating the bus and the connector. ing.

[0003]

However, in an apparatus having a large number of expansion slots, the space around the expansion slots is occupied by connectors, cables, fixtures, and the like.
Mounting the two switches was severe, complicating the mechanism and increasing the cost.

Further, according to this prior art, the device mounting is detected by a voltage change from the connector to which the device is mounted or the DETECT signal. However, since the power supply of the connector is not controlled, depending on the device to be removed. Has a risk of destroying input / output pins of an LSI or the like.

An object of the present invention is to provide a PCI hot plug control device capable of reducing the amount of hardware and simplifying the operation.

[0006]

A PCI hot plug control device according to the present invention comprises a PCI bus switch provided between a PCI bus and each PCI hot plug slot, and a power supply controller provided for each PCI hot plug slot. And a hot plug switch provided for each PCI hot plug slot, and when a hot plug switch event occurs due to operation of the hot plug switch, the presence or absence of operation of the PCI hot plug slot is determined. A hot plug controller that controls the PCI bus switch and the power supply controller corresponding to the PCI hot plug slot to perform hot plug processing for connection / disconnection to the PCI hot plug slot.

Further, the hot plug controller has a P
An operation information storage function for storing operation information from the CI bus switch and the power supply controller for each PCI hot plug slot, an event holding function for holding a hot plug switch event, and a hot plug switch event based on the operation information are connected. And a hot plug processing determination function for determining whether or not separation has occurred.
It has a hot plug processing function for controlling the CI bus switch and the power supply controller.

Alternatively, an event discriminating circuit for discriminating whether the hot plug switch event is connection or disconnection from the status of the PCI bus switch and the hot plug switch is provided, and the hot plug controller responds to the discrimination result. It controls the PCI bus switch and the power supply controller.

That is, the PCI hot plug control device according to the present invention has one hot plug switch for each PCI hot plug slot, and a hot plug switch event occurs when the hot plug switch is operated. The generated hot plug switch event is notified to the hot plug controller. The hot plug controller holds the operating state of each PCI hot plug slot in advance, and if the PCI hot plug slot in which the hot plug switch event has occurred is not operating, C
Connect processing, if in operation, Disconnect
OS (Operating)
The system can easily and surely control the power supply and control the PCI bus cycle without starting the hot plug driver on the System), thereby realizing a hot plug function for connecting or separating the PCI bus and the option board.

Referring to FIG. 1, in FIG.
When the hot plug switch 41 or 42 provided for each of the PCI hot plug slots 21 and 22 is pressed, the hot plug controller 5 is notified of the hot plug switch event by the hot plug signals 61 and 62.

In FIG. 2, the hot plug controller 5 refers to an internal operation information storage function 51,
The determination function 53 determines whether the hot plug switch event 52 is the connection processing 54 or the disconnect processing 55, and executes the hot plug processing.

Thus, each PCI hot plug slot 2
It has hot plug switches 41 and 42 for every 1.22,
The hot plug controller 5 stores operation information for each PCI hot plug slot, thereby reducing the amount of hardware and simplifying the operation of the hot plug control device.

[0013]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows two PCI hot plug slots.
This is an example of a system having one. This system is
PCI bus 1 and two PCI hot plug slots 2
1, PCI bus switches 11 and 12 provided between the PCI bus 1 and the respective PCI hot plug slots 21 and 22, and the respective PCI hot plug slots 21 and 2.
2 and a hot plug switch 4 for each PCI hot plug slot 21/22.
1 and 42 and the hot plug controller 5.

The hot plug controller 5 receives a hot plug interface signal 69 from the OS and a hot plug signal 61.6 from each of the hot plug switches 41 and 42.
2. Power supply determination signal 6 from each power supply controller 31/32
5.66 is input. In addition, the hot plug controller 5 sends power control signals 63 and 64 to the power controllers 31 and 32, and PC signals to the PCI bus switches 11 and 12.
I bus switch control signals 67 and 68 are output.

FIG. 2 is an explanatory diagram of functions in the hot plug controller 5. The hot plug controller 5 has an operation information storage function 51 for storing operation information from each of the power supply controllers 31 and 32 and each of the PCI bus switches 11 and 12, and an event storage for storing hot plug switch events from the hot plug switches 41 and 42. Function (event register) 52, hot plug processing determination function 5
3. It has a disconnect process 54 and a connect process 55. That is, as will be described later, the operation information storage function 51
It receives PCI bus connection information of each PCI hot plug slot and power supply information to the PCI slots from the bus switch and the power supply controller and stores them. When the hot plug switch is pressed, the hot plug determination function 53 uses the information stored in the operation information storage function 51 as a trigger to operate the slot corresponding to the pressed switch (i.e., PCI card is mounted or not), and the Connect processing or the Disconnect
It is determined which of the t processes is to be performed.

In the system as described above, in the PCI hot plug control device according to the present invention, the hot plug controller 5 uses the hot plug interface signal 69 from the OS to control the power control signals 63 and 64, the power determination signals 65 and 66, PCI bus switch control signal 67
・ 68, power supply controllers 31 and 32 and PCI
A hot plug function for controlling the bus switches 11 and 12 is realized.

For this purpose, a hot plug switch 41 and a hot plug switch 42 are provided, and an operation information storage function 51 for storing operation information for each PCI hot plug slot as shown in FIG. By providing a hot plug process determining function 53 for determining the operating state of the PCI hot plug slots 21 and 22 where the hot plug switch event 52 has occurred, the hot plug switch event
By determining whether the process is the ect process 54 or the connect process 55, the Conn by the hot plug switches 41 and 42 is determined.
The activation of the ect process or the disconnect process is realized.

The detailed operation will be described with reference to FIGS. For example, when the hot plug switch 41 of the PCI hot plug slot 21 is pressed, a hot plug processing request is notified to the hot plug controller 5 through the hot plug signal 61. The hot plug controller 5 causes the operation state storage function 51 of the PCI hot plug slot 21 to shift to the disconnect processing 54 when the PCI hot plug slot 21 is in the operating state, and shifts to the connect processing 55 when the PCI hot plug slot 21 is in the stopped state. And hot plug processing.

When the hot plug signal 61 is the connect processing 55, the hot plug controller 5 issues a power ON instruction via the power control signal 63 to the power controller 3.
1, when the power controller 31 receives the power ON instruction, it supplies various power to the PCI hot plug slot 21, and when the various power is stabilized, notifies the hot plug controller 5 of the power determination by the power determination signal 65. I do.

Next, when the hot plug controller 5 confirms that the power is normally turned on, the hot plug controller 5 controls the PCI bus switch 11 by the PCI bus switch control signal 67 to connect the PCI bus 1 to the PCI hot plug slot 21. I do.

When the connection to the PCI bus 1 is completed, the hot plug controller 5 clears the event register 52 in the hot plug controller 5 and connects to the OS by the hot plug interface signal 69.
The OS notifies that the processing has been completed, and activates a driver required for the PCI card connected to the PCI bus 1, and
The operation of the I hot plug slot 21 is started.

If the hot plug signal 61 is
In the case of the ct process 55, the hot plug controller 5
Disc by hot plug interface signal 69
The request of the connect process 54 is sent to the OS. OS
Receives the disconnect processing request,
After stopping the operation of the CI hot plug slot 21 and disconnecting the driver, a disconnect instruction for the PCI hot plug slot 21 is sent to the hot plug controller 5 by the hot plug interface signal 69.

When receiving the disconnect request from the OS, the hot plug controller 5 turns off the PCI bus switch 11 by the PCI bus switch control signal 67.
FF, PCI bus 1 and PCI hot plug slot 2
Disconnect 1 The hot plug controller 5 is a PCI
When the bus switch 11 is turned off, a power-off instruction is issued to the power controller 31 by the power control signal 63.

When the power supply controller 31 stops supplying power to the PCI hot plug slot 21 in response to the power OFF instruction, the power supply controller 31 notifies the hot plug controller 5 that the power has been turned off by the power supply determination signal 65, and the hot plug controller 5 It is confirmed that the power supply to the PCI hot plug slot 21 has been stopped. When the power supply stops, the hot plug controller 5 issues a hot plug instruction signal 5
9 notifies that Disconnect has ended.

FIG. 3 is a flowchart showing the connection processing / connection processing started by a hot plug command or a hot plug switch.
It is a flow chart which showed the flow of Disconnect processing. In this figure, step A1 is a hot plug command event, A2 is a Connect process determination,
B is a hot plug switch event, B1 is a PCI card operation determination, C is a connect process, C1 is a Conn.
normal termination of ect processing, D is Disconnect
OS notification of processing, D1 stops the operation of the PCI hot plug slot, D2 stops the driver used in the PCI hot plug slot, D3 disconnect processing, D4 normal termination of disconnect processing,
E is the driver activation of the connected PCI hot plug slot, E1 is the operation start of the connected PCI hot plug slot, E2 is the end of the connect event, F is the disconnection processing of the PCI hot plug slot due to the failure of the connect processing, and F1 is the hot plug event. Abnormal termination notification, G is Disconnect
Event is over.

Next, using this flowchart, the connection by the hot plug switch which is a feature of the present invention will be described.
The software operation of the t / Disconnect process will be described.

The hot plug controller 5 connects only the PCI hot plug slot in which the PCI card is mounted to the PCI bus 1 at the time of booting the OS and supplies power, and the PCI hot plug slot in which the PCI card is not mounted is Control is performed to disconnect from the PCI bus 1 and not to supply power. When a hot plug switch event (step B1) occurs during the operation of such a system, the hot plug controller 5 transmits the PCI bus connection information of the PCI hot plug slot corresponding to the hot plug switch in which the hot plug switch event has occurred and the PCI bus connection information. Based on the power supply information to the slot, it is determined whether the hot plug switch event is a Connect process or a Disconnect process based on the operation state of the PCI card (step B2).

If the hot plug switch event is Conn
In the case of ect processing, the hot plug controller 5
The process shifts to the nect process (step C) to execute the connect process for the PCI hot plug slot. When the Connect process ends, the hot plug controller 5 determines whether the process has ended normally (step C).
1) If there is an abnormality, the process proceeds to the disconnection process (step F) and the PCI hot plug slot is
After disconnecting from the I bus and stopping the power supply, the process proceeds to an abnormal end notification (step F1), notifies the OS of the abnormal end, and ends the hot plug switch event.

When the Connect process is completed normally, the hot plug controller 5 confirms that the process has been completed normally.
In response to this, the OS receives the notification and starts the slot driver (step E).
The type of the PCI card in the CI hot plug slot is determined, and the presence or absence of a driver for the PCI card is determined. If not, the driver is installed and the driver is started (step E). Start slot operation (step E1)
Starts the operation of the PCI hot plug slot and ends the hot plug switch event (step E).
2).

Hot plug switch event is Disc
In the case of the connect processing, the hot plug controller 5
Moves to the OS notification (step D), and informs the OS that the disconnect processing of the hot plug event has occurred.
Notify. When the OS receives the disconnect processing request from the hot plug controller 5, the OS shifts to the slot stop (step D1), and stops the processing of the PCI card operating in the PCI hot plug slot.
When the driver stops (step D2), the driver of the corresponding slot is stopped, and the disconnect processing (step D2) is performed.
Go to 3). In this disconnect process, the hot plug controller 5 disconnects the PCI hot plug slot from the PCI bus and stops power supply.

The hot plug controller 5 has a D
It is determined whether or not the disconnect is normally completed (step D4). If the disconnect is normally completed, the hot plug command is normally completed (step G). If there is an abnormality, the hot plug command is abnormally terminated (step F1).

The hot plug control device also has a conventional hot plug function, and can activate a hot plug command A1 on the OS and instruct a connect process or a disconnect process by the hot plug command A1. It is.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the PCI hot plug slot in operation uses the fact that the hot plug event signal has positive logic, the PCI bus switch control signal has positive logic, and the non-operating state has negative logic. Is D
An event determination circuit outside the hot plug controller 5 determines whether the request is an disconnect processing request.

In the system shown in FIG. 4, the PCI buses 1 and 2
PCI hot plug slots 21 and 22 and PCI
PCI bus switches 11 and 12 provided between the bus 1 and the PCI hot plug slots 21 and 22;
A power controller 31/32 for each CI hot plug slot 21/22;
In addition to the hot plug switches 41 and 42 for each of the 22 and the hot plug controller 5, there are provided event discriminating circuits 81 and 82 for outputting Connect processing request signals 70 and 71 or Disconnect processing request signals 72 and 73.

Now, in the PCI hot plug slot 21 of FIG. 4, when the PCI bus switch control signal 60 is positive logic, the PCI hot plug slot 21 is in operation. The determination circuit 81 determines that the positive logic of the PCI bus switch control signal 60 and the AND condition of the hot plug signal 62 are disconnect processing, and the hot plug controller 5 sends the PCI hot plug slot
The nect request 72 is notified.

On the other hand, when the PCI bus switch control signal 60 has a negative logic, the PCI hot plug slot 21 is not operating, and when a hot plug event occurs at this time, the event discriminating circuit 81 sets the PCI bus switch control. It determines that the logic of the signal 60 is inverted and the AND condition of the hot plug signal 62 is a connect process, and notifies the hot plug controller 5 of a PCI hot plug slot connect request 70.

The hot plug controller 5 is connected to each PCI
By executing the connect process or disconnect process by the hot plug connect requests 70 and 71 and the PCI hot plug disconnect requests 72 and 74, the P by the hot plug switches 42 and 43
Implement the CI hot plug function.

[0039]

According to the present invention, when a hot plug switch is operated in a system having a PCI hot plug control device provided with a hot plug switch, the PCI card in the corresponding PCI hot plug slot is operated by the PCI card. Connect processing of card or Dis
Since the connection can be performed automatically, no erroneous operation is performed. In addition, when replacing or adding / removing a PCI card, a hot plug command can be executed while checking the PCI hot plug slot, and there is no indirect work such as operating a keyboard or a mouse. It is possible to easily operate the hot plug control device for a target PCI hot plug slot without operating another PCI hot plug slot.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a PCI hot plug control device according to the present invention.

FIG. 2 is an explanatory diagram of functions in a hot plug controller in FIG. 1;

FIG. 3 shows a Connect process / Discon activated by a hot plug command or a hot plug switch.
It is a flowchart which shows the flow of a nect process.

FIG. 4 is a block diagram showing a system configuration of another example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PCI bus 5 Hot plug controller 11 ・ 12 PCI bus switch 21 ・ 22 PCI hot plug slot 31 ・ 32 Power supply controller 81 ・ 82 Event discrimination circuit

Claims (3)

(57) [Claims] 1. A PCI bus switch provided between a PCI bus and each PCI hot plug slot, a power supply controller provided for each PCI hot plug slot, and a hot plug also provided for each PCI hot plug slot When a hot plug switch event occurs due to operation of the hot plug switch, the presence or absence of operation of the PCI hot plug slot is determined, and the PC corresponding to the PCI hot plug slot is determined according to the determination result.
A PCI hot plug control device, comprising: a hot plug controller that controls an I bus switch and a power supply controller to perform hot plug processing for connection / disconnection to the PCI hot plug slot. 2. The hot plug controller receives operation information from a PCI bus switch and a power supply controller for each PC.
An operation information storage function for storing each I hot plug slot, an event holding function for holding a hot plug switch event, and a hot plug process for determining whether the hot plug switch event is connection or separation from the operation information A discriminating function and the P
2. The PCI hot plug control device according to claim 1, further comprising a hot plug processing function for controlling the CI bus switch and the power supply controller. 3. An event judging circuit for judging whether the hot plug switch event is connection or disconnection from the status of the PCI bus switch and the hot plug switch, and the hot plug controller responds to the judgment result. 2. The PCI hot plug control device according to claim 1, wherein said PCI hot plug control device controls said PCI bus switch and said power controller.