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microblaze: Get early printk console earlier 

1. Register early console as standard console
2. Enable CON_BOOT console flag to ensure auto-unregistering by the kernel
3. remap_early_printk function remap physical console baseaddr to virtual space

Usage specific function for console remap is done after memory initialization
with IRQ turn off that's why there is not necessary to protect it.

The reason for remapping is that the kernel use TLB 63 for 1:1 address mapping
to be able to use console in very early boot-up phase. But allocating one TLB
just for console caused performance degression that's why ioremaps create new
mapping and TLB 63 is automatically released and ready to use.

Signed-off-by: Michal Simek <monstr@monstr.eu>
CC: Russell King <linux@arm.linux.org.uk>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: Ingo Molnar <mingo@redhat.com>
CC: Alan Cox <alan@linux.intel.com>
CC: <linux-serial@vger.kernel.org>
CC: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Michal Simek 2011-04-04 15:45:06 +02:00
parent 95ce618f85
commit e721a45fbe
3 changed files with 22 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/microblaze/include/asm/setup.h
View File

@ -23,6 +23,7 @@ extern char cmd_line[COMMAND_LINE_SIZE];
void early_printk(const char *fmt, ...);
int setup_early_printk(char *opt);
void remap_early_printk(void);
void disable_early_printk(void);
#if defined(CONFIG_EARLY_PRINTK)

20
arch/microblaze/kernel/early_printk.c
View File

@ -60,7 +60,7 @@ static void early_printk_uartlite_write(struct console *unused,
static struct console early_serial_uartlite_console = {
.name = "earlyser",
.write = early_printk_uartlite_write,
.flags = CON_PRINTBUFFER,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1,
};
#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
@ -104,7 +104,7 @@ static void early_printk_uart16550_write(struct console *unused,
static struct console early_serial_uart16550_console = {
.name = "earlyser",
.write = early_printk_uart16550_write,
.flags = CON_PRINTBUFFER,
.flags = CON_PRINTBUFFER | CON_BOOT,
.index = -1,
};
#endif /* CONFIG_SERIAL_8250_CONSOLE */
@ -141,7 +141,7 @@ int __init setup_early_printk(char *opt)
early_printk("early_printk_console is enabled at 0x%08x\n",
base_addr);
/* register_console(early_console); */
register_console(early_console);
return 0;
}
@ -160,7 +160,7 @@ int __init setup_early_printk(char *opt)
early_printk("early_printk_console is enabled at 0x%08x\n",
base_addr);
/* register_console(early_console); */
register_console(early_console);
return 0;
}
@ -169,6 +169,18 @@ int __init setup_early_printk(char *opt)
return 1;
}
/* Remap early console to virtual address and do not allocate one TLB
* only for early console because of performance degression */
void __init remap_early_printk(void)
{
if (!early_console_initialized || !early_console)
return;
printk(KERN_INFO "early_printk_console remaping from 0x%x to ",
base_addr);
base_addr = (u32) ioremap(base_addr, PAGE_SIZE);
printk(KERN_CONT "0x%x\n", base_addr);
}
void __init disable_early_printk(void)
{
if (!early_console_initialized || !early_console)

5
arch/microblaze/kernel/setup.c
View File

@ -59,6 +59,11 @@ void __init setup_arch(char **cmdline_p)
setup_memory();
#ifdef CONFIG_EARLY_PRINTK
/* remap early console to virtual address */
remap_early_printk();
#endif
xilinx_pci_init();
#if defined(CONFIG_SELFMOD_INTC) || defined(CONFIG_SELFMOD_TIMER)