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sh: Remove old early serial console code V2 

Now when the sh-sci driver can do early serial output,
get rid of the old duplicated code. This patch is V2 and
removes support for "earlyprintk=serial" together with
the following kconfig options:
CONFIG_EARLY_SCIF_CONSOLE
CONFIG_EARLY_SCIF_CONSOLE_PORT
CONFIG_EARLY_PRINTK

With this patch applied "earlyprintk=" support is always
built-in the SuperH kernel. For this to work the serial
driver must have early platform support and in the case
of sh-sci the serial console needs to be enabled:
CONFIG_SERIAL_SH_SCI_CONSOLE=y

So after enabling the SuperH SCI console kconfig option
you also need to point out port using the kernel command
line: "earlyprintk=sh-sci.N[,baudrate][,keep]"

Remember that clocks may be disabled by the boot loader
so you may have to do some board specific static clock
setup before earlyprintk will work on your platform.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-12-14 12:52:53 +00:00 committed by Paul Mundt
parent d8d3fbb024
commit e76fe57447
3 changed files with 1 additions and 193 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
arch/sh/Kconfig.debug
View File

@ -19,50 +19,6 @@ config SH_STANDARD_BIOS
mask ROM and no flash (WindowsCE machines fall in this category).
If unsure, say N.
config EARLY_SCIF_CONSOLE
bool "Use early SCIF console"
help
This enables an early console using a fixed SCIF port. This can
be used by platforms that are either not running the SH
standard BIOS, or do not wish to use the BIOS callbacks for the
serial I/O.
config EARLY_SCIF_CONSOLE_PORT
hex
depends on EARLY_SCIF_CONSOLE
default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
default "0xf8420000" if CPU_SUBTYPE_SH7619
default "0xff804000" if CPU_SUBTYPE_MXG
default "0xffc30000" if CPU_SUBTYPE_SHX3
default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
CPU_SUBTYPE_SH7343
default "0xfe4c0000" if CPU_SUBTYPE_SH7757
default "0xffeb0000" if CPU_SUBTYPE_SH7785
default "0xffeb0000" if CPU_SUBTYPE_SH7786
default "0xfffe8000" if CPU_SUBTYPE_SH7203
default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
default "0xffe80000" if CPU_SH4
default "0xa4000150" if CPU_SH3
default "0x00000000"
config EARLY_PRINTK
bool "Early printk support"
depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
help
Say Y here to redirect kernel printk messages to the serial port
used by the SH-IPL bootloader, starting very early in the boot
process and ending when the kernel's serial console is initialised.
This option is only useful porting the kernel to a new machine,
when the kernel may crash or hang before the serial console is
initialised. If unsure, say N.
On devices that are running SH-IPL and want to keep the port
initialization consistent while not using the BIOS callbacks,
select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
the kernel command line option to toggle back and forth.
config STACK_DEBUG
bool "Check for stack overflows"
depends on DEBUG_KERNEL && SUPERH32

3
arch/sh/kernel/Makefile
View File

@ -22,11 +22,10 @@ obj-y := debugtraps.o dma-nommu.o dumpstack.o \
obj-y += cpu/
obj-$(CONFIG_VSYSCALL) += vsyscall/
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o
obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o early_printk.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_MODULES) += sh_ksyms_$(BITS).o module.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o

147
arch/sh/kernel/early_printk.c
View File

@ -15,7 +15,6 @@
#include <linux/io.h>
#include <linux/delay.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#include <asm/sh_bios.h>
/*
@ -57,140 +56,7 @@ static struct console bios_console = {
.flags = CON_PRINTBUFFER,
.index = -1,
};
#endif
#ifdef CONFIG_EARLY_SCIF_CONSOLE
#include <linux/serial_core.h>
#include "../../../drivers/serial/sh-sci.h"
#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
defined(CONFIG_CPU_SUBTYPE_SH7721)
#define EPK_SCSMR_VALUE 0x000
#define EPK_SCBRR_VALUE 0x00C
#define EPK_FIFO_SIZE 64
#define EPK_FIFO_BITS (0x7f00 >> 8)
#else
#define EPK_FIFO_SIZE 16
#define EPK_FIFO_BITS (0x1f00 >> 8)
#endif
static struct uart_port scif_port = {
.type = PORT_SCIF,
.mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
.membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
};
static void scif_sercon_putc(int c)
{
while (((sci_in(&scif_port, SCFDR) & EPK_FIFO_BITS) >= EPK_FIFO_SIZE))
;
sci_in(&scif_port, SCxSR);
sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
sci_out(&scif_port, SCxTDR, c);
while ((sci_in(&scif_port, SCxSR) & 0x40) == 0)
;
if (c == '\n')
scif_sercon_putc('\r');
}
static void scif_sercon_write(struct console *con, const char *s,
unsigned count)
{
while (count-- > 0)
scif_sercon_putc(*s++);
}
static int __init scif_sercon_setup(struct console *con, char *options)
{
con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
return 0;
}
static struct console scif_console = {
.name = "sercon",
.write = scif_sercon_write,
.setup = scif_sercon_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#if !defined(CONFIG_SH_STANDARD_BIOS)
#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
defined(CONFIG_CPU_SUBTYPE_SH7721)
static void scif_sercon_init(char *s)
{
sci_out(&scif_port, SCSCR, 0x0000); /* clear TE and RE */
sci_out(&scif_port, SCFCR, 0x4006); /* reset */
sci_out(&scif_port, SCSCR, 0x0000); /* select internal clock */
sci_out(&scif_port, SCSMR, EPK_SCSMR_VALUE);
sci_out(&scif_port, SCBRR, EPK_SCBRR_VALUE);
mdelay(1); /* wait 1-bit time */
sci_out(&scif_port, SCFCR, 0x0030); /* TTRG=b'11 */
sci_out(&scif_port, SCSCR, 0x0030); /* TE, RE */
}
#elif defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SH3)
#define DEFAULT_BAUD 115200
/*
* Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
* devices that aren't using sh-ipl+g.
*/
static void scif_sercon_init(char *s)
{
struct uart_port *port = &scif_port;
unsigned baud = DEFAULT_BAUD;
unsigned int status;
char *e;
if (*s == ',')
++s;
if (*s) {
/* ignore ioport/device name */
s += strcspn(s, ",");
if (*s == ',')
s++;
}
if (*s) {
baud = simple_strtoul(s, &e, 0);
if (baud == 0 || s == e)
baud = DEFAULT_BAUD;
}
do {
status = sci_in(port, SCxSR);
} while (!(status & SCxSR_TEND(port)));
sci_out(port, SCSCR, 0); /* TE=0, RE=0 */
sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
sci_out(port, SCSMR, 0);
/* Set baud rate */
sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) /
(32 * baud) - 1);
udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
sci_out(port, SCSPTR, 0);
sci_out(port, SCxSR, 0x60);
sci_out(port, SCLSR, 0);
sci_out(port, SCFCR, 0);
sci_out(port, SCSCR, 0x30); /* TE=1, RE=1 */
}
#endif /* defined(CONFIG_CPU_SUBTYPE_SH7720) */
#endif /* !defined(CONFIG_SH_STANDARD_BIOS) */
#endif /* CONFIG_EARLY_SCIF_CONSOLE */
/*
* Setup a default console, if more than one is compiled in, rely on the
* earlyprintk= parsing to give priority.
*/
static struct console *early_console;
static int __init setup_early_printk(char *buf)
@ -203,21 +69,8 @@ static int __init setup_early_printk(char *buf)
if (strstr(buf, "keep"))
keep_early = 1;
#ifdef CONFIG_SH_STANDARD_BIOS
if (!strncmp(buf, "bios", 4))
early_console = &bios_console;
#endif
#if defined(CONFIG_EARLY_SCIF_CONSOLE)
if (!strncmp(buf, "serial", 6)) {
early_console = &scif_console;
#if !defined(CONFIG_SH_STANDARD_BIOS)
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SH3)
scif_sercon_init(buf + 6);
#endif
#endif
}
#endif
if (likely(early_console)) {
if (keep_early)