179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* polling mode stateless debugging stuff, originally for NS16550 Serial Ports
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*
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* c 2001 PPC 64 Team, IBM Corp
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*/
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#include <stdarg.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <asm/processor.h>
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#include <asm/udbg.h>
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void (*udbg_putc)(char c);
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void (*udbg_flush)(void);
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int (*udbg_getc)(void);
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int (*udbg_getc_poll)(void);
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/*
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* Early debugging facilities. You can enable _one_ of these via .config,
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* if you do so your kernel _will not boot_ on anything else. Be careful.
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*/
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void __init udbg_early_init(void)
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{
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#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
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/* For LPAR machines that have an HVC console on vterm 0 */
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udbg_init_debug_lpar();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI)
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/* For LPAR machines that have an HVSI console on vterm 0 */
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udbg_init_debug_lpar_hvsi();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
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/* For use on Apple G5 machines */
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udbg_init_pmac_realmode();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
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/* RTAS panel debug */
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udbg_init_rtas_panel();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
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/* RTAS console debug */
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udbg_init_rtas_console();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
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/* Maple real mode debug */
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udbg_init_maple_realmode();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
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udbg_init_pas_realmode();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
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udbg_init_btext();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
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/* PPC44x debug */
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udbg_init_44x_as1();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
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/* PPC40x debug */
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udbg_init_40x_realmode();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
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udbg_init_cpm();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
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udbg_init_usbgecko();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
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/* In memory console */
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udbg_init_memcons();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
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udbg_init_ehv_bc();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
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udbg_init_ps3gelic();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
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udbg_init_debug_opal_raw();
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#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
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udbg_init_debug_opal_hvsi();
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#endif
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#ifdef CONFIG_PPC_EARLY_DEBUG
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console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
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register_early_udbg_console();
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#endif
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}
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/* udbg library, used by xmon et al */
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void udbg_puts(const char *s)
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{
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if (udbg_putc) {
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char c;
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if (s && *s != '\0') {
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while ((c = *s++) != '\0')
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udbg_putc(c);
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}
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if (udbg_flush)
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udbg_flush();
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}
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#if 0
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else {
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printk("%s", s);
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}
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#endif
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}
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int udbg_write(const char *s, int n)
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{
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int remain = n;
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char c;
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if (!udbg_putc)
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return 0;
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if (s && *s != '\0') {
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while (((c = *s++) != '\0') && (remain-- > 0)) {
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udbg_putc(c);
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}
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}
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if (udbg_flush)
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udbg_flush();
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return n - remain;
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}
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#define UDBG_BUFSIZE 256
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void udbg_printf(const char *fmt, ...)
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{
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if (udbg_putc) {
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char buf[UDBG_BUFSIZE];
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va_list args;
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va_start(args, fmt);
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vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
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udbg_puts(buf);
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va_end(args);
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}
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}
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void __init udbg_progress(char *s, unsigned short hex)
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{
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udbg_puts(s);
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udbg_puts("\n");
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}
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/*
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* Early boot console based on udbg
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*/
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static void udbg_console_write(struct console *con, const char *s,
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unsigned int n)
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{
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udbg_write(s, n);
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}
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static struct console udbg_console = {
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.name = "udbg",
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.write = udbg_console_write,
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.flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
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.index = 0,
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};
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/*
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* Called by setup_system after ppc_md->probe and ppc_md->early_init.
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* Call it again after setting udbg_putc in ppc_md->setup_arch.
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*/
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void __init register_early_udbg_console(void)
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{
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if (early_console)
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return;
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if (!udbg_putc)
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return;
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if (strstr(boot_command_line, "udbg-immortal")) {
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printk(KERN_INFO "early console immortal !\n");
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udbg_console.flags &= ~CON_BOOT;
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}
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early_console = &udbg_console;
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register_console(&udbg_console);
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}
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#if 0 /* if you want to use this as a regular output console */
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console_initcall(register_udbg_console);
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#endif
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