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serial: 8250: Separate legacy irq handling from core port operations

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Prepare for 8250 split; decouple irq setup/teardown and handler from
core port operations.

Introduce setup_irq() and release_irq() 8250 driver methods; the 8250
core will use these methods to install and remove irq handling for
the given 8250 port.

Refactor irq chain linking/unlinking from 8250 core into
univ8250_setup_irq()/univ8250_release_irq() for the universal 8250 driver.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley
2015-02-24 14:25:07 -05:00
committed by Greg Kroah-Hartman
parent 6e28157173
commit a4416cd1ac
2 changed files with 68 additions and 30 deletions
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15
include/linux/serial_8250.h
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@@ -60,6 +60,20 @@ enum {
};
struct uart_8250_dma;
struct uart_8250_port;
/**
* 8250 core driver operations
*
* @setup_irq() Setup irq handling. The universal 8250 driver links this
* port to the irq chain. Other drivers may @request_irq().
* @release_irq() Undo irq handling. The universal 8250 driver unlinks
* the port from the irq chain.
*/
struct uart_8250_ops {
int (*setup_irq)(struct uart_8250_port *);
void (*release_irq)(struct uart_8250_port *);
};
/*
* This should be used by drivers which want to register
@@ -100,6 +114,7 @@ struct uart_8250_port {
unsigned char msr_saved_flags;
struct uart_8250_dma *dma;
const struct uart_8250_ops *ops;
/* 8250 specific callbacks */
int (*dl_read)(struct uart_8250_port *);