From d4cb2d17946466740afeb195a57d6cb290bf4cc0 Mon Sep 17 00:00:00 2001
From: Stefan Roese <sr@denx.de>
Date: Sat, 13 Oct 2007 16:43:23 +0200
Subject: ppc4xx: Dynamic configuration of 4xx PCIe mode as root or endpoint
 mode

This patch adds support for dynamic configuration of PCIe ports for the
AMCC PPC4xx boards equipped with PCIe interfaces. These are the PPC440SPe
boards Yucca & Katmai and the 405EX board Kilauea.

This dynamic configuration is done via the "pcie_mode" environement
variable. This variable can be set to "EP" or "RP" for endpoint or
rootpoint mode. Multiple values can be joined via the ":" delimiter.
Here an example:

pcie_mode=RP:EP:EP

This way, PCIe port 0 will be configured as rootpoint, PCIe port 1 and 2
as endpoint.

Per default Yucca will be configured as:
pcie_mode=RP:EP:EP

Per default Katmai will be configured as:
pcie_mode=RP:RP:REP

Per default Kilauea will be configured as:
pcie_mode=RP:RP

Signed-off-by: Tirumala R Marri <tmarri@amcc.com>
Signed-off-by: Stefan Roese <sr@denx.de>
---
 include/asm-ppc/4xx_pcie.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 include/configs/katmai.h   |  1 +
 include/configs/kilauea.h  |  1 +
 include/configs/yucca.h    |  1 +
 4 files changed, 55 insertions(+)

(limited to 'include')

diff --git a/include/asm-ppc/4xx_pcie.h b/include/asm-ppc/4xx_pcie.h
index 17ac57b23b..1830c6a8ef 100644
--- a/include/asm-ppc/4xx_pcie.h
+++ b/include/asm-ppc/4xx_pcie.h
@@ -244,6 +244,9 @@
 #define U64_TO_U32_LOW(val)	((u32)((val) & 0x00000000ffffffffULL))
 #define U64_TO_U32_HIGH(val)	((u32)((val) >> 32))
 
+/*
+ * Prototypes
+ */
 int ppc4xx_init_pcie(void);
 int ppc4xx_init_pcie_rootport(int port);
 int ppc4xx_init_pcie_endport(int port);
@@ -251,6 +254,55 @@ void ppc4xx_setup_pcie_rootpoint(struct pci_controller *hose, int port);
 int ppc4xx_setup_pcie_endpoint(struct pci_controller *hose, int port);
 int pcie_hose_scan(struct pci_controller *hose, int bus);
 
+/*
+ * Function to determine root port or endport from env variable.
+ */
+static inline int is_end_point(int port)
+{
+	static char s[10], *tk;
+
+	strcpy(s, getenv("pcie_mode"));
+	tk = strtok(s, ":");
+
+	switch (port) {
+	case 0:
+		if (tk != NULL) {
+			if (!(strcmp(tk, "ep") && strcmp(tk, "EP")))
+				return 1;
+			else
+				return 0;
+		}
+		else
+			return 0;
+
+	case 1:
+		tk = strtok(NULL, ":");
+		if (tk != NULL) {
+			if (!(strcmp(tk, "ep") && strcmp(tk, "EP")))
+				return 1;
+			else
+				return 0;
+		}
+		else
+			return 0;
+
+	case 2:
+		tk = strtok(NULL, ":");
+		if (tk != NULL)
+			tk = strtok(NULL, ":");
+		if (tk != NULL) {
+			if (!(strcmp(tk, "ep") && strcmp(tk, "EP")))
+				return 1;
+			else
+				return 0;
+		}
+		else
+			return 0;
+	}
+
+	return 0;
+}
+
 static inline void mdelay(int n)
 {
 	u32 ms = n;
diff --git a/include/configs/katmai.h b/include/configs/katmai.h
index 8a963279f0..cccfc1316d 100644
--- a/include/configs/katmai.h
+++ b/include/configs/katmai.h
@@ -205,6 +205,7 @@
 	"upd=run load;run update\0"					\
 	"kozio=bootm ffc60000\0"					\
 	"pciconfighost=1\0"						\
+	"pcie_mode=RP:RP:RP\0"						\
 	""
 #define CONFIG_BOOTCOMMAND	"run flash_self"
 
diff --git a/include/configs/kilauea.h b/include/configs/kilauea.h
index 461f8f0591..f5e20235f7 100644
--- a/include/configs/kilauea.h
+++ b/include/configs/kilauea.h
@@ -205,6 +205,7 @@
 		"setenv filesize;saveenv\0"				\
 	"nupd=run nload nupdate\0"					\
 	"pciconfighost=1\0"						\
+	"pcie_mode=RP:RP\0"						\
 	""
 #define CONFIG_BOOTCOMMAND	"run flash_self"
 
diff --git a/include/configs/yucca.h b/include/configs/yucca.h
index ab7fb0ab8c..2b4024dfd9 100644
--- a/include/configs/yucca.h
+++ b/include/configs/yucca.h
@@ -186,6 +186,7 @@
 		"setenv filesize;saveenv\0"				\
 	"upd=run load;run update\0"					\
 	"pciconfighost=1\0"						\
+	"pcie_mode=RP:EP:EP\0"						\
 	""
 #define CONFIG_BOOTCOMMAND	"run flash_self"
 
-- 
cgit