mirror of https://gitee.com/openkylin/linux.git
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
Paul Mundt
parent
d8d3fbb024
commit
e76fe57447
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@ -19,50 +19,6 @@ config SH_STANDARD_BIOS
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mask ROM and no flash (WindowsCE machines fall in this category).
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If unsure, say N.
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config EARLY_SCIF_CONSOLE
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bool "Use early SCIF console"
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help
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This enables an early console using a fixed SCIF port. This can
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be used by platforms that are either not running the SH
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standard BIOS, or do not wish to use the BIOS callbacks for the
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serial I/O.
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config EARLY_SCIF_CONSOLE_PORT
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hex
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depends on EARLY_SCIF_CONSOLE
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default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
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default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
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default "0xf8420000" if CPU_SUBTYPE_SH7619
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default "0xff804000" if CPU_SUBTYPE_MXG
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default "0xffc30000" if CPU_SUBTYPE_SHX3
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default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
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CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
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CPU_SUBTYPE_SH7343
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default "0xfe4c0000" if CPU_SUBTYPE_SH7757
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default "0xffeb0000" if CPU_SUBTYPE_SH7785
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default "0xffeb0000" if CPU_SUBTYPE_SH7786
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default "0xfffe8000" if CPU_SUBTYPE_SH7203
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default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
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default "0xffe80000" if CPU_SH4
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default "0xa4000150" if CPU_SH3
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default "0x00000000"
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config EARLY_PRINTK
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bool "Early printk support"
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depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
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help
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Say Y here to redirect kernel printk messages to the serial port
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used by the SH-IPL bootloader, starting very early in the boot
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process and ending when the kernel's serial console is initialised.
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This option is only useful porting the kernel to a new machine,
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when the kernel may crash or hang before the serial console is
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initialised. If unsure, say N.
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On devices that are running SH-IPL and want to keep the port
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initialization consistent while not using the BIOS callbacks,
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select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
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the kernel command line option to toggle back and forth.
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config STACK_DEBUG
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bool "Check for stack overflows"
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depends on DEBUG_KERNEL && SUPERH32
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@ -22,11 +22,10 @@ obj-y := debugtraps.o dma-nommu.o dumpstack.o \
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obj-y += cpu/
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obj-$(CONFIG_VSYSCALL) += vsyscall/
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o
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obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o early_printk.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o
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obj-$(CONFIG_MODULES) += sh_ksyms_$(BITS).o module.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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@ -15,7 +15,6 @@
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#include <linux/io.h>
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#include <linux/delay.h>
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#ifdef CONFIG_SH_STANDARD_BIOS
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#include <asm/sh_bios.h>
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/*
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@ -57,140 +56,7 @@ static struct console bios_console = {
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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#endif
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#ifdef CONFIG_EARLY_SCIF_CONSOLE
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#include <linux/serial_core.h>
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#include "../../../drivers/serial/sh-sci.h"
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#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
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defined(CONFIG_CPU_SUBTYPE_SH7721)
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#define EPK_SCSMR_VALUE 0x000
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#define EPK_SCBRR_VALUE 0x00C
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#define EPK_FIFO_SIZE 64
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#define EPK_FIFO_BITS (0x7f00 >> 8)
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#else
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#define EPK_FIFO_SIZE 16
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#define EPK_FIFO_BITS (0x1f00 >> 8)
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#endif
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static struct uart_port scif_port = {
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.type = PORT_SCIF,
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.mapbase = CONFIG_EARLY_SCIF_CONSOLE_PORT,
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.membase = (char __iomem *)CONFIG_EARLY_SCIF_CONSOLE_PORT,
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};
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static void scif_sercon_putc(int c)
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{
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while (((sci_in(&scif_port, SCFDR) & EPK_FIFO_BITS) >= EPK_FIFO_SIZE))
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;
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sci_in(&scif_port, SCxSR);
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sci_out(&scif_port, SCxSR, 0xf3 & ~(0x20 | 0x40));
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sci_out(&scif_port, SCxTDR, c);
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while ((sci_in(&scif_port, SCxSR) & 0x40) == 0)
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;
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if (c == '\n')
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scif_sercon_putc('\r');
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}
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static void scif_sercon_write(struct console *con, const char *s,
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unsigned count)
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{
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while (count-- > 0)
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scif_sercon_putc(*s++);
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}
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static int __init scif_sercon_setup(struct console *con, char *options)
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{
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con->cflag = CREAD | HUPCL | CLOCAL | B115200 | CS8;
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return 0;
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}
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static struct console scif_console = {
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.name = "sercon",
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.write = scif_sercon_write,
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.setup = scif_sercon_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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#if !defined(CONFIG_SH_STANDARD_BIOS)
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#if defined(CONFIG_CPU_SUBTYPE_SH7720) || \
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defined(CONFIG_CPU_SUBTYPE_SH7721)
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static void scif_sercon_init(char *s)
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{
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sci_out(&scif_port, SCSCR, 0x0000); /* clear TE and RE */
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sci_out(&scif_port, SCFCR, 0x4006); /* reset */
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sci_out(&scif_port, SCSCR, 0x0000); /* select internal clock */
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sci_out(&scif_port, SCSMR, EPK_SCSMR_VALUE);
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sci_out(&scif_port, SCBRR, EPK_SCBRR_VALUE);
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mdelay(1); /* wait 1-bit time */
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sci_out(&scif_port, SCFCR, 0x0030); /* TTRG=b'11 */
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sci_out(&scif_port, SCSCR, 0x0030); /* TE, RE */
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}
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#elif defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SH3)
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#define DEFAULT_BAUD 115200
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/*
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* Simple SCIF init, primarily aimed at SH7750 and other similar SH-4
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* devices that aren't using sh-ipl+g.
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*/
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static void scif_sercon_init(char *s)
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{
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struct uart_port *port = &scif_port;
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unsigned baud = DEFAULT_BAUD;
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unsigned int status;
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char *e;
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if (*s == ',')
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++s;
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if (*s) {
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/* ignore ioport/device name */
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s += strcspn(s, ",");
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if (*s == ',')
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s++;
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}
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if (*s) {
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baud = simple_strtoul(s, &e, 0);
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if (baud == 0 || s == e)
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baud = DEFAULT_BAUD;
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}
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do {
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status = sci_in(port, SCxSR);
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} while (!(status & SCxSR_TEND(port)));
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sci_out(port, SCSCR, 0); /* TE=0, RE=0 */
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sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
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sci_out(port, SCSMR, 0);
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/* Set baud rate */
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sci_out(port, SCBRR, (CONFIG_SH_PCLK_FREQ + 16 * baud) /
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(32 * baud) - 1);
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udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
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sci_out(port, SCSPTR, 0);
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sci_out(port, SCxSR, 0x60);
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sci_out(port, SCLSR, 0);
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sci_out(port, SCFCR, 0);
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sci_out(port, SCSCR, 0x30); /* TE=1, RE=1 */
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}
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#endif /* defined(CONFIG_CPU_SUBTYPE_SH7720) */
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#endif /* !defined(CONFIG_SH_STANDARD_BIOS) */
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#endif /* CONFIG_EARLY_SCIF_CONSOLE */
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/*
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* Setup a default console, if more than one is compiled in, rely on the
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* earlyprintk= parsing to give priority.
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*/
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static struct console *early_console;
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static int __init setup_early_printk(char *buf)
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@ -203,21 +69,8 @@ static int __init setup_early_printk(char *buf)
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if (strstr(buf, "keep"))
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keep_early = 1;
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#ifdef CONFIG_SH_STANDARD_BIOS
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if (!strncmp(buf, "bios", 4))
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early_console = &bios_console;
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#endif
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#if defined(CONFIG_EARLY_SCIF_CONSOLE)
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if (!strncmp(buf, "serial", 6)) {
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early_console = &scif_console;
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#if !defined(CONFIG_SH_STANDARD_BIOS)
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#if defined(CONFIG_CPU_SH4) || defined(CONFIG_CPU_SH3)
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scif_sercon_init(buf + 6);
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#endif
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#endif
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}
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#endif
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if (likely(early_console)) {
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if (keep_early)
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