Date:	Sun, 8 Aug 2010 23:11:16 -0400
From:	Andres Salomon <dilinger@...ued.net>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	devicetree-discuss@...ts.ozlabs.org, sparclinux@...r.kernel.org,
	davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] sparc: make driver/of/pdt no longer sparc-specific


Clean up pdt.c:
 - make build dependent upon config OF_PROMTREE
 - #ifdef out the sparc-specific stuff
 - create pdt-specific header
 - create a pdt_ops struct that pdt uses to call arch-specific prom routines

Signed-off-by: Andres Salomon <dilinger@...ued.net>
---
 arch/sparc/Kconfig              |    1 +
 arch/sparc/include/asm/prom.h   |    5 +-
 arch/sparc/kernel/prom.h        |    6 --
 arch/sparc/kernel/prom_common.c |   57 ++++++++++++++++++++++-
 drivers/of/Kconfig              |    4 ++
 drivers/of/Makefile             |    1 +
 drivers/of/pdt.c                |   98 +++++++++++++++++++++++++-------------
 include/linux/of_pdt.h          |   42 +++++++++++++++++
 8 files changed, 171 insertions(+), 43 deletions(-)
 create mode 100644 include/linux/of_pdt.h

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 13a9f2f..ed3f009 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -24,6 +24,7 @@ config SPARC
 	select HAVE_ARCH_KGDB if !SMP || SPARC64
 	select HAVE_ARCH_TRACEHOOK
 	select ARCH_WANT_OPTIONAL_GPIOLIB
+	select OF_PROMTREE
 	select RTC_CLASS
 	select RTC_DRV_M48T59
 	select HAVE_PERF_EVENTS
diff --git a/arch/sparc/include/asm/prom.h b/arch/sparc/include/asm/prom.h
index f845828..329a976 100644
--- a/arch/sparc/include/asm/prom.h
+++ b/arch/sparc/include/asm/prom.h
@@ -18,6 +18,7 @@
  * 2 of the License, or (at your option) any later version.
  */
 #include <linux/types.h>
+#include <linux/of_pdt.h>
 #include <linux/proc_fs.h>
 #include <linux/mutex.h>
 #include <asm/atomic.h>
@@ -65,8 +66,8 @@ extern struct device_node *of_console_device;
 extern char *of_console_path;
 extern char *of_console_options;
 
-extern void (*prom_build_more)(struct device_node *dp, struct device_node ***nextp);
-extern char *build_full_name(struct device_node *dp);
+extern void irq_trans_init(struct device_node *dp);
+extern char *build_path_component(struct device_node *dp);
 
 #endif /* __KERNEL__ */
 #endif /* _SPARC_PROM_H */
diff --git a/arch/sparc/kernel/prom.h b/arch/sparc/kernel/prom.h
index eeb04a7..cf5fe1c 100644
--- a/arch/sparc/kernel/prom.h
+++ b/arch/sparc/kernel/prom.h
@@ -4,12 +4,6 @@
 #include <linux/spinlock.h>
 #include <asm/prom.h>
 
-extern void * prom_early_alloc(unsigned long size);
-extern void irq_trans_init(struct device_node *dp);
-
-extern unsigned int prom_unique_id;
-
-extern char *build_path_component(struct device_node *dp);
 extern void of_console_init(void);
 
 extern unsigned int prom_early_allocated;
diff --git a/arch/sparc/kernel/prom_common.c b/arch/sparc/kernel/prom_common.c
index 7b454f6..4c5f67f 100644
--- a/arch/sparc/kernel/prom_common.c
+++ b/arch/sparc/kernel/prom_common.c
@@ -20,6 +20,7 @@
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/of_pdt.h>
 #include <asm/prom.h>
 #include <asm/oplib.h>
 #include <asm/leon.h>
@@ -117,6 +118,60 @@ int of_find_in_proplist(const char *list, const char *match, int len)
 }
 EXPORT_SYMBOL(of_find_in_proplist);
 
+/*
+ * SPARC32 and SPARC64's prom_firstprop/prom_nextprop do things differently
+ * here, despite sharing the same interface.  SPARC32 doesn't fill in 'buf',
+ * returning NULL on an error.  SPARC64 fills in 'buf', but sets it to an
+ * empty string upon error.
+ */
+static int __init handle_prop_quirks(char *buf, const char *name)
+{
+	if (!name || strlen(name) == 0)
+		return -1;
+
+#ifdef CONFIG_SPARC32
+	strcpy(buf, name);
+#endif
+	return 0;
+}
+
+static int __init prom_common_firstprop(phandle node, char *buf)
+{
+	const char *name;
+
+	buf[0] = '\0';
+	name = prom_firstprop(node, buf);
+	return handle_prop_quirks(buf, name);
+}
+
+static int __init prom_common_nextprop(phandle node, const char *prev,
+		char *buf)
+{
+	const char *name;
+
+	buf[0] = '\0';
+	name = prom_nextprop(node, prev, buf);
+	return handle_prop_quirks(buf, name);
+}
+
 unsigned int prom_early_allocated __initdata;
 
-#include "../../../drivers/of/pdt.c"
+static struct of_pdt_ops prom_sparc_ops __initdata = {
+	.firstprop = prom_common_firstprop,
+	.nextprop = prom_common_nextprop,
+	.getproplen = (int (*)(phandle, const char *))prom_getproplen,
+	.getproperty = (int (*)(phandle, const char *, char *, int))prom_getproperty,
+	.getchild = (phandle (*)(phandle))prom_getchild,
+	.getsibling = (phandle (*)(phandle))prom_getsibling,
+};
+
+void __init prom_build_devicetree(void)
+{
+	of_pdt_set_ops(&prom_sparc_ops);
+	of_pdt_build_devicetree(prom_root_node);
+
+	of_console_init();
+
+	printk(KERN_INFO "PROM: Built device tree with %u bytes of memory.\n",
+	       prom_early_allocated);
+}
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 1678dbc..c8a4b7c 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -5,6 +5,10 @@ config OF_FLATTREE
 	bool
 	depends on OF
 
+config OF_PROMTREE
+	bool
+	depends on OF
+
 config OF_DYNAMIC
 	def_bool y
 	depends on OF && PPC_OF
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index f232cc9..54e8517 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -1,5 +1,6 @@
 obj-y = base.o
 obj-$(CONFIG_OF_FLATTREE) += fdt.o
+obj-$(CONFIG_OF_PROMTREE) += pdt.o
 obj-$(CONFIG_OF_DEVICE) += device.o platform.o
 obj-$(CONFIG_OF_GPIO)   += gpio.o
 obj-$(CONFIG_OF_I2C)	+= of_i2c.o
diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
index 61d9477..22f46fb 100644
--- a/drivers/of/pdt.c
+++ b/drivers/of/pdt.c
@@ -1,5 +1,4 @@
-/* prom_common.c: OF device tree support common code.
- *
+/*
  * Paul Mackerras	August 1996.
  * Copyright (C) 1996-2005 Paul Mackerras.
  *
@@ -7,6 +6,7 @@
  *    {engebret|bergner}@...ibm.com
  *
  *  Adapted for sparc by David S. Miller davem@...emloft.net
+ *  Adapted for multiple architectures by Andres Salomon <dilinger@...ued.net>
  *
  *      This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
@@ -20,13 +20,44 @@
 #include <linux/mutex.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/of_pdt.h>
 #include <asm/prom.h>
-#include <asm/oplib.h>
-#include <asm/leon.h>
 
-void (*prom_build_more)(struct device_node *dp, struct device_node ***nextp);
+void __initdata (*prom_build_more)(struct device_node *dp,
+		struct device_node ***nextp);
+
+static struct of_pdt_ops prom_ops __initdata;
+
+#if defined(CONFIG_SPARC)
+static unsigned int prom_unique_id __initdata;
+
+#define inc_unique_id(p) do { \
+	(p)->unique_id = prom_unique_id++; \
+} while (0)
+
+static inline const char *fetch_node_name(struct device_node *dp)
+{
+	return dp->path_component_name;
+}
+
+#else
+
+static inline void inc_unique_id(void *p)
+{
+	/* unused on non-SPARC architectures */
+}
+
+static inline const char *fetch_node_name(struct device_node *dp)
+{
+	return dp->name;
+}
+
+static inline void irq_trans_init(struct device_node *dp)
+{
+	/* unused on non-SPARC architectures */
+}
 
-unsigned int prom_unique_id;
+#endif /* !CONFIG_SPARC */
 
 static struct property * __init build_one_prop(phandle node, char *prev,
 					       char *special_name,
@@ -35,7 +66,6 @@ static struct property * __init build_one_prop(phandle node, char *prev,
 {
 	static struct property *tmp = NULL;
 	struct property *p;
-	const char *name;
 
 	if (tmp) {
 		p = tmp;
@@ -43,7 +73,7 @@ static struct property * __init build_one_prop(phandle node, char *prev,
 		tmp = NULL;
 	} else {
 		p = prom_early_alloc(sizeof(struct property) + 32);
-		p->unique_id = prom_unique_id++;
+		inc_unique_id(p);
 	}
 
 	p->name = (char *) (p + 1);
@@ -53,27 +83,24 @@ static struct property * __init build_one_prop(phandle node, char *prev,
 		p->value = prom_early_alloc(special_len);
 		memcpy(p->value, special_val, special_len);
 	} else {
-		if (prev == NULL) {
-			name = prom_firstprop(node, p->name);
-		} else {
-			name = prom_nextprop(node, prev, p->name);
-		}
+		int err;
 
-		if (!name || strlen(name) == 0) {
+		if (prev == NULL)
+			err = prom_ops.firstprop(node, p->name);
+		else
+			err = prom_ops.nextprop(node, prev, p->name);
+		if (err) {
 			tmp = p;
 			return NULL;
 		}
-#ifdef CONFIG_SPARC32
-		strcpy(p->name, name);
-#endif
-		p->length = prom_getproplen(node, p->name);
+		p->length = prom_ops.getproplen(node, p->name);
 		if (p->length <= 0) {
 			p->length = 0;
 		} else {
 			int len;
 
 			p->value = prom_early_alloc(p->length + 1);
-			len = prom_getproperty(node, p->name, p->value,
+			len = prom_ops.getproperty(node, p->name, p->value,
 					       p->length);
 			if (len <= 0)
 				p->length = 0;
@@ -106,10 +133,10 @@ static char * __init get_one_property(phandle node, const char *name)
 	char *buf = "<NULL>";
 	int len;
 
-	len = prom_getproplen(node, name);
+	len = prom_ops.getproplen(node, name);
 	if (len > 0) {
 		buf = prom_early_alloc(len);
-		len = prom_getproperty(node, name, buf, len);
+		len = prom_ops.getproperty(node, name, buf, len);
 	}
 
 	return buf;
@@ -124,7 +151,7 @@ static struct device_node * __init prom_create_node(phandle node,
 		return NULL;
 
 	dp = prom_early_alloc(sizeof(*dp));
-	dp->unique_id = prom_unique_id++;
+	inc_unique_id(dp);
 	dp->parent = parent;
 
 	kref_init(&dp->kref);
@@ -140,13 +167,13 @@ static struct device_node * __init prom_create_node(phandle node,
 	return dp;
 }
 
-char * __init build_full_name(struct device_node *dp)
+static char * __init build_full_name(struct device_node *dp)
 {
 	int len, ourlen, plen;
 	char *n;
 
 	plen = strlen(dp->parent->full_name);
-	ourlen = strlen(dp->path_component_name);
+	ourlen = strlen(fetch_node_name(dp));
 	len = ourlen + plen + 2;
 
 	n = prom_early_alloc(len);
@@ -155,7 +182,7 @@ char * __init build_full_name(struct device_node *dp)
 		strcpy(n + plen, "/");
 		plen++;
 	}
-	strcpy(n + plen, dp->path_component_name);
+	strcpy(n + plen, fetch_node_name(dp));
 
 	return n;
 }
@@ -182,36 +209,39 @@ static struct device_node * __init prom_build_tree(struct device_node *parent,
 		*(*nextp) = dp;
 		*nextp = &dp->allnext;
 
+#if defined(CONFIG_SPARC)
 		dp->path_component_name = build_path_component(dp);
+#endif
 		dp->full_name = build_full_name(dp);
 
-		dp->child = prom_build_tree(dp, prom_getchild(node), nextp);
+		dp->child = prom_build_tree(dp, prom_ops.getchild(node), nextp);
 
 		if (prom_build_more)
 			prom_build_more(dp, nextp);
 
-		node = prom_getsibling(node);
+		node = prom_ops.getsibling(node);
 	}
 
 	return ret;
 }
 
-void __init prom_build_devicetree(void)
+void __init of_pdt_build_devicetree(int root_node)
 {
 	struct device_node **nextp;
 
-	allnodes = prom_create_node(prom_root_node, NULL);
+	allnodes = prom_create_node(root_node, NULL);
 	allnodes->path_component_name = "";
 	allnodes->full_name = "/";
 
 	nextp = &allnodes->allnext;
 	allnodes->child = prom_build_tree(allnodes,
-			prom_getchild(allnodes->phandle),
+			prom_ops.getchild(allnodes->phandle),
 			&nextp);
+}
 
-	of_console_init();
+void __init of_pdt_set_ops(struct of_pdt_ops *ops)
+{
+	BUG_ON(!ops);
 
-	printk("PROM: Built device tree with %u bytes of memory.\n",
-	       prom_early_allocated);
+	prom_ops = *ops;
 }
-
diff --git a/include/linux/of_pdt.h b/include/linux/of_pdt.h
new file mode 100644
index 0000000..1324ba5
--- /dev/null
+++ b/include/linux/of_pdt.h
@@ -0,0 +1,42 @@
+/*
+ * Definitions for building a device tree by calling into the
+ * Open Firmware PROM.
+ *
+ * Copyright (C) 2010  Andres Salomon <dilinger@...ued.net>
+ *
+ * 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.
+ */
+
+#ifndef _LINUX_OF_PDT_H
+#define _LINUX_OF_PDT_H
+
+extern void *prom_early_alloc(unsigned long size);
+
+/* overridable operations for calling into the PROM */
+struct of_pdt_ops {
+	/* buffers passed should be 32 bytes; return 0 on success */
+	int (*firstprop)(phandle node, char *buf);
+	int (*nextprop)(phandle node, const char *prev, char *buf);
+
+	/* for both functions, return proplen on success; -1 on error */
+	int (*getproplen)(phandle node, const char *prop);
+	int (*getproperty)(phandle node, const char *prop, char *buf,
+			int bufsize);
+
+	/* phandles are 0 if no child or sibling exists */
+	phandle (*getchild)(phandle parent);
+	phandle (*getsibling)(phandle node);
+};
+
+extern void of_pdt_set_ops(struct of_pdt_ops *ops);
+
+/* for building the device tree */
+extern void of_pdt_build_devicetree(int root_node);
+
+extern void (*prom_build_more)(struct device_node *dp,
+		struct device_node ***nextp);
+
+#endif /* _LINUX_OF_PDT_H */
-- 
1.5.6.5

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