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-rw-r--r--arch/powerpc/kernel/udbg.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
new file mode 100644
index 000000000..92b3fc258
--- /dev/null
+++ b/arch/powerpc/kernel/udbg.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * polling mode stateless debugging stuff, originally for NS16550 Serial Ports
+ *
+ * c 2001 PPC 64 Team, IBM Corp
+ */
+
+#include <linux/stdarg.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <asm/processor.h>
+#include <asm/udbg.h>
+
+void (*udbg_putc)(char c);
+void (*udbg_flush)(void);
+int (*udbg_getc)(void);
+int (*udbg_getc_poll)(void);
+
+/*
+ * Early debugging facilities. You can enable _one_ of these via .config,
+ * if you do so your kernel _will not boot_ on anything else. Be careful.
+ */
+void __init udbg_early_init(void)
+{
+#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
+ /* For LPAR machines that have an HVC console on vterm 0 */
+ udbg_init_debug_lpar();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI)
+ /* For LPAR machines that have an HVSI console on vterm 0 */
+ udbg_init_debug_lpar_hvsi();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
+ /* For use on Apple G5 machines */
+ udbg_init_pmac_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
+ /* RTAS panel debug */
+ udbg_init_rtas_panel();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
+ /* RTAS console debug */
+ udbg_init_rtas_console();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
+ /* Maple real mode debug */
+ udbg_init_maple_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
+ udbg_init_pas_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX)
+ udbg_init_btext();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
+ /* PPC44x debug */
+ udbg_init_44x_as1();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
+ /* PPC40x debug */
+ udbg_init_40x_realmode();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
+ udbg_init_cpm();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO)
+ udbg_init_usbgecko();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
+ /* In memory console */
+ udbg_init_memcons();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
+ udbg_init_ehv_bc();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
+ udbg_init_ps3gelic();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW)
+ udbg_init_debug_opal_raw();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI)
+ udbg_init_debug_opal_hvsi();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_16550)
+ udbg_init_debug_16550();
+#endif
+
+#ifdef CONFIG_PPC_EARLY_DEBUG
+ console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
+
+ register_early_udbg_console();
+#endif
+}
+
+/* udbg library, used by xmon et al */
+void udbg_puts(const char *s)
+{
+ if (udbg_putc) {
+ char c;
+
+ if (s && *s != '\0') {
+ while ((c = *s++) != '\0')
+ udbg_putc(c);
+ }
+
+ if (udbg_flush)
+ udbg_flush();
+ }
+#if 0
+ else {
+ printk("%s", s);
+ }
+#endif
+}
+
+int udbg_write(const char *s, int n)
+{
+ int remain = n;
+ char c;
+
+ if (!udbg_putc)
+ return 0;
+
+ if (s && *s != '\0') {
+ while (((c = *s++) != '\0') && (remain-- > 0)) {
+ udbg_putc(c);
+ }
+ }
+
+ if (udbg_flush)
+ udbg_flush();
+
+ return n - remain;
+}
+
+#define UDBG_BUFSIZE 256
+void udbg_printf(const char *fmt, ...)
+{
+ if (udbg_putc) {
+ char buf[UDBG_BUFSIZE];
+ va_list args;
+
+ va_start(args, fmt);
+ vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
+ udbg_puts(buf);
+ va_end(args);
+ }
+}
+
+void __init udbg_progress(char *s, unsigned short hex)
+{
+ udbg_puts(s);
+ udbg_puts("\n");
+}
+
+/*
+ * Early boot console based on udbg
+ */
+static void udbg_console_write(struct console *con, const char *s,
+ unsigned int n)
+{
+ udbg_write(s, n);
+}
+
+static struct console udbg_console = {
+ .name = "udbg",
+ .write = udbg_console_write,
+ .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
+ .index = 0,
+};
+
+/*
+ * Called by setup_system after ppc_md->probe and ppc_md->early_init.
+ * Call it again after setting udbg_putc in ppc_md->setup_arch.
+ */
+void __init register_early_udbg_console(void)
+{
+ if (early_console)
+ return;
+
+ if (!udbg_putc)
+ return;
+
+ if (strstr(boot_command_line, "udbg-immortal")) {
+ printk(KERN_INFO "early console immortal !\n");
+ udbg_console.flags &= ~CON_BOOT;
+ }
+ early_console = &udbg_console;
+ register_console(&udbg_console);
+}
+
+#if 0 /* if you want to use this as a regular output console */
+console_initcall(register_udbg_console);
+#endif