summaryrefslogtreecommitdiff
path: root/arch/microblaze/kernel/prom.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/microblaze/kernel/prom.c
Initial import
Diffstat (limited to 'arch/microblaze/kernel/prom.c')
-rw-r--r--arch/microblaze/kernel/prom.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
new file mode 100644
index 000000000..68f099960
--- /dev/null
+++ b/arch/microblaze/kernel/prom.c
@@ -0,0 +1,116 @@
+/*
+ * Procedures for creating, accessing and interpreting the device tree.
+ *
+ * Paul Mackerras August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ * {engebret|bergner}@us.ibm.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <stdarg.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/stringify.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/bitops.h>
+#include <linux/kexec.h>
+#include <linux/debugfs.h>
+#include <linux/irq.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <linux/io.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/pci-bridge.h>
+
+#ifdef CONFIG_EARLY_PRINTK
+static const char *stdout;
+
+static int __init early_init_dt_scan_chosen_serial(unsigned long node,
+ const char *uname, int depth, void *data)
+{
+ int l;
+ const char *p;
+
+ pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
+
+ if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
+ strcmp(uname, "chosen@0") == 0)) {
+ p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
+ if (p != NULL && l > 0)
+ stdout = p; /* store pointer to stdout-path */
+ }
+
+ if (stdout && strstr(stdout, uname)) {
+ p = of_get_flat_dt_prop(node, "compatible", &l);
+ pr_debug("Compatible string: %s\n", p);
+
+ if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
+ (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
+ unsigned int addr;
+
+ *(u32 *)data = UART16550;
+
+ addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
+ addr += *(u32 *)of_get_flat_dt_prop(node,
+ "reg-offset", &l);
+ /* clear register offset */
+ return be32_to_cpu(addr) & ~3;
+ }
+ if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
+ (strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
+ (strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
+ (strncmp(p, "xlnx,mdm", 8) == 0)) {
+ const unsigned int *addrp;
+
+ *(u32 *)data = UARTLITE;
+
+ addrp = of_get_flat_dt_prop(node, "reg", &l);
+ return be32_to_cpup(addrp); /* return address */
+ }
+ }
+ return 0;
+}
+
+/* this function is looking for early console - Microblaze specific */
+int __init of_early_console(void *version)
+{
+ return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
+}
+#endif
+
+void __init early_init_devtree(void *params)
+{
+ pr_debug(" -> early_init_devtree(%p)\n", params);
+
+ early_init_dt_scan(params);
+ if (!strlen(boot_command_line))
+ strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
+
+ parse_early_param();
+
+ memblock_allow_resize();
+
+ pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
+
+ pr_debug(" <- early_init_devtree()\n");
+}