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authorLey Foon Tan <lftan@altera.com>2015-02-10 18:21:08 +0300
committerLey Foon Tan <lftan@altera.com>2015-02-10 18:21:08 +0300
commite8bf5bc776edef44777b13b2eb4461d653519bae (patch)
tree91626d85686ba2938f0c1fa76633b790a76c3cfc /arch/nios2/kernel/prom.c
parent96f3a5cc33baede169e0d330119090789e97e86b (diff)
downloadlinux-e8bf5bc776edef44777b13b2eb4461d653519bae.tar.xz
nios2: add early printk support
Signed-off-by: Ley Foon Tan <lftan@altera.com>
Diffstat (limited to 'arch/nios2/kernel/prom.c')
-rw-r--r--arch/nios2/kernel/prom.c52
1 files changed, 51 insertions, 1 deletions
diff --git a/arch/nios2/kernel/prom.c b/arch/nios2/kernel/prom.c
index 0522d3378e3f..718dd197909f 100644
--- a/arch/nios2/kernel/prom.c
+++ b/arch/nios2/kernel/prom.c
@@ -1,7 +1,7 @@
/*
* Device tree support
*
- * Copyright (C) 2013 Altera Corporation
+ * Copyright (C) 2013, 2015 Altera Corporation
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
*
* Based on MIPS support for CONFIG_OF device tree support
@@ -30,6 +30,7 @@
#include <linux/of_fdt.h>
#include <linux/io.h>
+#include <asm/prom.h>
#include <asm/sections.h>
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
@@ -63,3 +64,52 @@ void __init early_init_devtree(void *params)
early_init_dt_scan(params);
}
+
+#ifdef CONFIG_EARLY_PRINTK
+static int __init early_init_dt_scan_serial(unsigned long node,
+ const char *uname, int depth, void *data)
+{
+ u64 *addr64 = (u64 *) data;
+ const char *p;
+
+ /* only consider serial nodes */
+ if (strncmp(uname, "serial", 6) != 0)
+ return 0;
+
+ p = of_get_flat_dt_prop(node, "compatible", NULL);
+ if (!p)
+ return 0;
+
+ /*
+ * We found an altera_jtaguart but it wasn't configured for console, so
+ * skip it.
+ */
+#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
+ if (strncmp(p, "altr,juart", 10) == 0)
+ return 0;
+#endif
+
+ /*
+ * Same for altera_uart.
+ */
+#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
+ if (strncmp(p, "altr,uart", 9) == 0)
+ return 0;
+#endif
+
+ *addr64 = fdt_translate_address((const void *)initial_boot_params,
+ node);
+
+ return *addr64 == OF_BAD_ADDR ? 0 : 1;
+}
+
+unsigned long __init of_early_console(void)
+{
+ u64 base = 0;
+
+ if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
+ return (u32)ioremap(base, 32);
+ else
+ return 0;
+}
+#endif /* CONFIG_EARLY_PRINTK */