From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Simek Subject: Re: [PATCH 18/56] microblaze_v2: early_printk support Date: Mon, 05 May 2008 22:10:06 +0200 Message-ID: <481F699E.1080001@seznam.cz> References: <378157891bac535dbc55e658d5f03fdd332e85cf.1209897266.git.monstr@monstr.eu> Reply-To: monstr@seznam.cz Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from smtp1.wifiinternet.cz ([89.31.47.1]:54775 "EHLO bor.wifiinternet.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755970AbYEEUJC (ORCPT ); Mon, 5 May 2008 16:09:02 -0400 In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: Grant Likely Cc: linux-kernel@vger.kernel.org, arnd@arndb.de, linux-arch@vger.kernel.org, stephen.neuendorffer@xilinx.com, John.Linn@xilinx.com, john.williams@petalogix.com, matthew@wil.cx, will.newton@gmail.com, drepper@redhat.com, microblaze-uclinux@itee.uq.edu.au, Michal Simek I added it to future plan on wiki. M > On Sun, May 4, 2008 at 5:41 AM, wrote: >> From: Michal Simek >> >> >> Signed-off-by: Michal Simek > > I'm not opposed to this as is, but longer term will you be getting the > base address out of the device tree instead of from > CONFIG_EARLY_PRINTK_UARTLITE_ADDRESS? > > Cheers, > g. > >> --- >> arch/microblaze/kernel/early_printk.c | 115 +++++++++++++++++++++++++++++++++ >> 1 files changed, 115 insertions(+), 0 deletions(-) >> create mode 100644 arch/microblaze/kernel/early_printk.c >> >> diff --git a/arch/microblaze/kernel/early_printk.c b/arch/microblaze/kernel/early_printk.c >> new file mode 100644 >> index 0000000..0f533ff >> --- /dev/null >> +++ b/arch/microblaze/kernel/early_printk.c >> @@ -0,0 +1,115 @@ >> +/* >> + * arch/microblaze/kernel/early_printk.c >> + * >> + * Copyright (C) 2007 Michal Simek >> + * Copyright (C) 2003-2006 Yasushi SHOJI >> + * >> + * Early printk support for Microblaze. >> + * >> + * Once we got some system without uart light, we need to refactor. >> + */ >> + >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> + >> +#ifdef CONFIG_EARLY_PRINTK >> +#define BASE_ADDR ((unsigned char *)CONFIG_EARLY_PRINTK_UARTLITE_ADDRESS) >> + >> +#define RX_FIFO BASE_ADDR >> +#define TX_FIFO ((unsigned long *)(BASE_ADDR + 4)) >> +#define STATUS ((unsigned long *)(BASE_ADDR + 8)) >> +#define CONTROL ((unsigned long *)(BASE_ADDR + 12)) >> + >> +static void early_printk_putc(char c) >> +{ >> + while (ioread32(STATUS) & (1<<3)); >> + iowrite32((c & 0xff), TX_FIFO); >> +} >> + >> +static void early_printk_write(struct console *unused, >> + const char *s, unsigned n) >> +{ >> + while (*s && n-- > 0) { >> + early_printk_putc(*s); >> + if (*s == '\n') >> + early_printk_putc('\r'); >> + s++; >> + } >> +} >> + >> +static struct console early_serial_console = { >> + .name = "earlyser", >> + .write = early_printk_write, >> + .flags = CON_PRINTBUFFER, >> + .index = -1, >> +}; >> + >> +/* Direct interface for emergencies */ >> +static struct console *early_console = &early_serial_console; >> +static int early_console_initialized; >> + >> +void early_printk(const char *fmt, ...) >> +{ >> + char buf[512]; >> + int n; >> + va_list ap; >> + >> + if (early_console_initialized) { >> + va_start(ap, fmt); >> + n = vscnprintf(buf, 512, fmt, ap); >> + early_console->write(early_console, buf, n); >> + va_end(ap); >> + } >> +} >> + >> +static int __initdata keep_early; >> + >> +int __init setup_early_printk(char *opt) >> +{ >> + char *space; >> + char buf[256]; >> + >> + if (early_console_initialized) >> + return 1; >> + >> + strlcpy(buf, opt, sizeof(buf)); >> + space = strchr(buf, ' '); >> + if (space) >> + *space = 0; >> + >> + if (strstr(buf, "keep")) >> + keep_early = 1; >> + >> + early_console = &early_serial_console; >> + early_console_initialized = 1; >> + register_console(early_console); >> + return 0; >> +} >> +#if 0 >> +static void __init disable_early_printk(void) >> +{ >> + if (!early_console_initialized || !early_console) >> + return; >> + if (!keep_early) { >> + printk(KERN_INFO "disabling early console\n"); >> + unregister_console(early_console); >> + early_console_initialized = 0; >> + } else >> + printk(KERN_INFO "keeping early console\n"); >> +} >> +#endif >> + >> +__setup("earlyprintk=", setup_early_printk); >> + >> +#else >> +void early_printk(const char *fmt, ...) >> +{ >> +} >> +#endif >> -- >> 1.5.4.GIT >> >> > > >