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

This reverts commit 6b1a98d1c4851235d9b6764b3f7b7db7909fc760.

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>

3 files changed, 0 insertions, 107 deletions

diff --git a/drivers/tty/serial/8250_dw.c b/drivers/tty/serial/8250_dw.c
deleted file mode 100644
index e25782aeec7a..000000000000
--- a/drivers/tty/serial/8250_dw.c
+++ /dev/null
@@ -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;
-}
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index d2d1cc2329b7..a9b307f582e1 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -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
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 7b59958f50ec..78748136ccc8 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -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