Revert "tty: serial8250: add helpers for the DesignWare 8250"
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
Родитель
0b37004dd0
Коммит
9a234349de
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@ -1,99 +0,0 @@
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/*
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* Synopsys DesignWare specific 8250 operations.
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*
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* Copyright 2011 Picochip, Jamie Iles.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* The Synopsys DesignWare 8250 has an extra feature whereby it detects if the
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* LCR is written whilst busy. If it is, then a busy detect interrupt is
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* raised, the LCR needs to be rewritten and the uart status register read.
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*/
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#include <linux/io.h>
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#include <linux/serial_8250.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include <linux/slab.h>
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struct dw8250_data {
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int last_lcr;
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};
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static void dw8250_serial_out(struct uart_port *p, int offset, int value)
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{
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struct dw8250_data *d = p->private_data;
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if (offset == UART_LCR)
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d->last_lcr = value;
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offset <<= p->regshift;
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writeb(value, p->membase + offset);
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}
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static unsigned int dw8250_serial_in(struct uart_port *p, int offset)
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{
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offset <<= p->regshift;
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return readb(p->membase + offset);
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}
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static void dw8250_serial_out32(struct uart_port *p, int offset,
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int value)
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{
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struct dw8250_data *d = p->private_data;
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if (offset == UART_LCR)
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d->last_lcr = value;
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offset <<= p->regshift;
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writel(value, p->membase + offset);
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}
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static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
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{
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offset <<= p->regshift;
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return readl(p->membase + offset);
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}
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/* Offset for the DesignWare's UART Status Register. */
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#define UART_USR 0x1f
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static int dw8250_handle_irq(struct uart_port *p)
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{
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struct dw8250_data *d = p->private_data;
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unsigned int iir = p->serial_in(p, UART_IIR);
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if (serial8250_handle_irq(p, iir)) {
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return 1;
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} else if ((iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
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/* Clear the USR and write the LCR again. */
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(void)p->serial_in(p, UART_USR);
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p->serial_out(p, d->last_lcr, UART_LCR);
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return 1;
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}
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return 0;
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}
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int serial8250_use_designware_io(struct uart_port *up)
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{
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up->private_data = kzalloc(sizeof(struct dw8250_data), GFP_KERNEL);
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if (!up->private_data)
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return -ENOMEM;
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if (up->iotype == UPIO_MEM32) {
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up->serial_out = dw8250_serial_out32;
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up->serial_in = dw8250_serial_in32;
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} else {
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up->serial_out = dw8250_serial_out;
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up->serial_in = dw8250_serial_in;
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}
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up->handle_irq = dw8250_handle_irq;
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return 0;
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}
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@ -267,13 +267,6 @@ config SERIAL_8250_RM9K
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port hardware found on MIPS RM9122 and similar processors.
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If unsure, say N.
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config SERIAL_8250_DW
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bool "Support for Synopsys DesignWare 8250 quirks"
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depends on SERIAL_8250
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help
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Selecting this option will enable handling of the extra features
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present in the Synopsys DesignWare APB UART.
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comment "Non-8250 serial port support"
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config SERIAL_AMBA_PL010
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@ -28,7 +28,6 @@ obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o
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obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
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obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
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obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
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obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
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obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
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obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
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obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
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@ -86,13 +86,5 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
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extern void serial8250_set_isa_configurator(void (*v)
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(int port, struct uart_port *up,
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unsigned short *capabilities));
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#ifndef SERIAL_8250_DW
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extern int serial8250_use_designware_io(struct uart_port *up);
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#else
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static inline int serial8250_use_designware_io(struct uart_port *up)
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{
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return -EIO;
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}
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#endif
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#endif
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