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Revert "tty: serial8250: add helpers for the DesignWare 8250"

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This reverts commit 6b1a98d1c4.

It causes a build error that needs to be resolved differently.

Cc: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2011-08-24 15:25:49 -07:00
parent 0b37004dd0
commit 9a234349de
4 changed files with 0 additions and 115 deletions
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99
drivers/tty/serial/8250_dw.c
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@ -1,99 +0,0 @@
/*
* Synopsys DesignWare specific 8250 operations.
*
* Copyright 2011 Picochip, Jamie Iles.
*
* 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.
*
* The Synopsys DesignWare 8250 has an extra feature whereby it detects if the
* LCR is written whilst busy. If it is, then a busy detect interrupt is
* raised, the LCR needs to be rewritten and the uart status register read.
*/
#include <linux/io.h>
#include <linux/serial_8250.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/slab.h>
struct dw8250_data {
int last_lcr;
};
static void dw8250_serial_out(struct uart_port *p, int offset, int value)
{
struct dw8250_data *d = p->private_data;
if (offset == UART_LCR)
d->last_lcr = value;
offset <<= p->regshift;
writeb(value, p->membase + offset);
}
static unsigned int dw8250_serial_in(struct uart_port *p, int offset)
{
offset <<= p->regshift;
return readb(p->membase + offset);
}
static void dw8250_serial_out32(struct uart_port *p, int offset,
int value)
{
struct dw8250_data *d = p->private_data;
if (offset == UART_LCR)
d->last_lcr = value;
offset <<= p->regshift;
writel(value, p->membase + offset);
}
static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
{
offset <<= p->regshift;
return readl(p->membase + offset);
}
/* Offset for the DesignWare's UART Status Register. */
#define UART_USR 0x1f
static int dw8250_handle_irq(struct uart_port *p)
{
struct dw8250_data *d = p->private_data;
unsigned int iir = p->serial_in(p, UART_IIR);
if (serial8250_handle_irq(p, iir)) {
return 1;
} else if ((iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
/* Clear the USR and write the LCR again. */
(void)p->serial_in(p, UART_USR);
p->serial_out(p, d->last_lcr, UART_LCR);
return 1;
}
return 0;
}
int serial8250_use_designware_io(struct uart_port *up)
{
up->private_data = kzalloc(sizeof(struct dw8250_data), GFP_KERNEL);
if (!up->private_data)
return -ENOMEM;
if (up->iotype == UPIO_MEM32) {
up->serial_out = dw8250_serial_out32;
up->serial_in = dw8250_serial_in32;
} else {
up->serial_out = dw8250_serial_out;
up->serial_in = dw8250_serial_in;
}
up->handle_irq = dw8250_handle_irq;
return 0;
}

7
drivers/tty/serial/Kconfig
View File

@ -267,13 +267,6 @@ config SERIAL_8250_RM9K
port hardware found on MIPS RM9122 and similar processors.
If unsure, say N.
config SERIAL_8250_DW
bool "Support for Synopsys DesignWare 8250 quirks"
depends on SERIAL_8250
help
Selecting this option will enable handling of the extra features
present in the Synopsys DesignWare APB UART.
comment "Non-8250 serial port support"
config SERIAL_AMBA_PL010

1
drivers/tty/serial/Makefile
View File

@ -28,7 +28,6 @@ obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o
obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o

8
include/linux/serial_8250.h
View File

@ -86,13 +86,5 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
extern void serial8250_set_isa_configurator(void (*v)
(int port, struct uart_port *up,
unsigned short *capabilities));
#ifndef SERIAL_8250_DW
extern int serial8250_use_designware_io(struct uart_port *up);
#else
static inline int serial8250_use_designware_io(struct uart_port *up)
{
return -EIO;
}
#endif
#endif