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ARM: OMAP2+: UART: cleanup 8250 console driver support 

We had been using traditional 8250 driver as uart console driver
prior to omap-serial driver. Since we have omap-serial driver
in mainline kernel for some time now it has been used as default
uart console driver on omap2+ platforms. Remove 8250 support for
omap-uarts.

Serial_in and serial_out override for 8250 serial driver is also
removed. Empty fifo read fix is already taken care with omap-serial
driver with data ready bit check from LSR reg before reading RX fifo.
Also waiting for THRE(transmit hold reg empty) is done with wait_for_xmitr
in omap-serial driver.

Serial_in/out overrides are not neceesary for omap-serial driver
and things that are taken with omap-serial driver are removed here.

Remove headers that were necessary to support 8250 support
and remove all config bindings done to keep 8250 backward compatibility
while adding omap-serial driver. Remove omap_uart_reset needed for
8250 autoconf.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Govindraj.R 2011-09-13 13:32:32 +05:30 committed by Kevin Hilman
parent 8384c9749f
commit 8a60585159
1 changed files with 0 additions and 97 deletions
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97
arch/arm/mach-omap2/serial.c
View File

@ -19,23 +19,17 @@
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/serial_8250.h>
#include <linux/pm_runtime.h>
#include <linux/console.h>
#ifdef CONFIG_SERIAL_OMAP
#include <plat/omap-serial.h>
#endif
#include "common.h"
#include <plat/board.h>
#include <plat/clock.h>
#include <plat/dma.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
@ -47,10 +41,8 @@
#include "control.h"
#include "mux.h"
#define UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV 0x52
#define UART_OMAP_WER 0x17 /* Wake-up enable register */
#define UART_ERRATA_FIFO_FULL_ABORT (0x1 << 0)
#define UART_ERRATA_i202_MDR1_ACCESS (0x1 << 1)
/*
@ -533,41 +525,6 @@ static void omap_uart_block_sleep(struct omap_uart_state *uart)
#define DEV_CREATE_FILE(dev, attr)
#endif /* CONFIG_PM */
#ifndef CONFIG_SERIAL_OMAP
/*
* Override the default 8250 read handler: mem_serial_in()
* Empty RX fifo read causes an abort on omap3630 and omap4
* This function makes sure that an empty rx fifo is not read on these silicons
* (OMAP1/2/3430 are not affected)
*/
static unsigned int serial_in_override(struct uart_port *up, int offset)
{
if (UART_RX == offset) {
unsigned int lsr;
lsr = __serial_read_reg(up, UART_LSR);
if (!(lsr & UART_LSR_DR))
return -EPERM;
}
return __serial_read_reg(up, offset);
}
static void serial_out_override(struct uart_port *up, int offset, int value)
{
unsigned int status, tmout = 10000;
status = __serial_read_reg(up, UART_LSR);
while (!(status & UART_LSR_THRE)) {
/* Wait up to 10ms for the character(s) to be sent. */
if (--tmout == 0)
break;
udelay(1);
status = __serial_read_reg(up, UART_LSR);
}
__serial_write_reg(up, offset, value);
}
#endif
static int __init omap_serial_early_init(void)
{
int i = 0;
@ -628,15 +585,7 @@ void __init omap_serial_init_port(struct omap_board_data *bdata)
void *pdata = NULL;
u32 pdata_size = 0;
char *name;
#ifndef CONFIG_SERIAL_OMAP
struct plat_serial8250_port ports[2] = {
{},
{.flags = 0},
};
struct plat_serial8250_port *p = &ports[0];
#else
struct omap_uart_port_info omap_up;
#endif
if (WARN_ON(!bdata))
return;
@ -651,51 +600,6 @@ void __init omap_serial_init_port(struct omap_board_data *bdata)
oh = uart->oh;
uart->dma_enabled = 0;
#ifndef CONFIG_SERIAL_OMAP
name = "serial8250";
/*
* !! 8250 driver does not use standard IORESOURCE* It
* has it's own custom pdata that can be taken from
* the hwmod resource data. But, this needs to be
* done after the build.
*
* ?? does it have to be done before the register ??
* YES, because platform_device_data_add() copies
* pdata, it does not use a pointer.
*/
p->flags = UPF_BOOT_AUTOCONF;
p->iotype = UPIO_MEM;
p->regshift = 2;
p->uartclk = OMAP24XX_BASE_BAUD * 16;
p->irq = oh->mpu_irqs[0].irq;
p->mapbase = oh->slaves[0]->addr->pa_start;
p->membase = omap_hwmod_get_mpu_rt_va(oh);
p->irqflags = IRQF_SHARED;
p->private_data = uart;
/*
* omap44xx, ti816x: Never read empty UART fifo
* omap3xxx: Never read empty UART fifo on UARTs
* with IP rev >=0x52
*/
uart->regshift = p->regshift;
uart->membase = p->membase;
if (cpu_is_omap44xx() || cpu_is_ti81xx())
uart->errata |= UART_ERRATA_FIFO_FULL_ABORT;
else if ((serial_read_reg(uart, UART_OMAP_MVER) & 0xFF)
>= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV)
uart->errata |= UART_ERRATA_FIFO_FULL_ABORT;
if (uart->errata & UART_ERRATA_FIFO_FULL_ABORT) {
p->serial_in = serial_in_override;
p->serial_out = serial_out_override;
}
pdata = &ports[0];
pdata_size = 2 * sizeof(struct plat_serial8250_port);
#else
name = DRIVER_NAME;
omap_up.dma_enabled = uart->dma_enabled;
@ -707,7 +611,6 @@ void __init omap_serial_init_port(struct omap_board_data *bdata)
pdata = &omap_up;
pdata_size = sizeof(struct omap_uart_port_info);
#endif
if (WARN_ON(!oh))
return;