[U-Boot-Users] [PATCH] ppc4xx: Pass PCIe root-complex/endpoint configuration to Linux via the fdt

[Stefan Roese]

The PCIe root-complex/endpoint setup as configured via the "pcie_mode"
environment variable will now get passed to the Linux kernel by setting
the device_type property of the PCIe device tree node. For normal root-
complex configuration it will keep its defaults value of "pci" and for
endpoint configuration it will get changed to "pci-endpoint".

Signed-off-by: Stefan Roese <sr at denx.de>
---
 cpu/ppc4xx/fdt.c           |   42 ++++++++++++++++++++++++++++++++++++++++++
 include/asm-ppc/4xx_pcie.h |    5 ++++-
 2 files changed, 46 insertions(+), 1 deletions(-)

diff --git a/cpu/ppc4xx/fdt.c b/cpu/ppc4xx/fdt.c
index afcb974..1f4d6f2 100644
--- a/cpu/ppc4xx/fdt.c
+++ b/cpu/ppc4xx/fdt.c
@@ -31,9 +31,46 @@
 #include <libfdt.h>
 #include <libfdt_env.h>
 #include <fdt_support.h>
+#include <asm/4xx_pcie.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+/*
+ * Fixup all PCIe nodes by setting the device_type property
+ * to "pci-endpoint" instead is "pci" for endpoint ports.
+ * This property will get checked later by the Linux driver
+ * to properly configure the PCIe port in Linux (again).
+ */
+void fdt_pcie_setup(void *blob)
+{
+	const char *compat = "ibm,plb-pciex";
+	const char *prop = "device_type";
+	const char *prop_val = "pci-endpoint";
+	const u32 *port;
+	int no;
+	int rc;
+
+	/* Search first PCIe node */
+	no = fdt_node_offset_by_compatible(blob, -1, compat);
+	while (no != -FDT_ERR_NOTFOUND) {
+		port = fdt_getprop(blob, no, "port", NULL);
+		if (port == NULL) {
+			printf("WARNING: could not find port property\n");
+		} else {
+			if (is_end_point(*port)) {
+				rc = fdt_setprop(blob, no, prop, prop_val,
+						 strlen(prop_val) + 1);
+				if (rc < 0)
+					printf("WARNING: could not set %s for %s: %s.\n",
+					       prop, compat, fdt_strerror(rc));
+			}
+		}
+
+		/* Jump to next PCIe node */
+		no = fdt_node_offset_by_compatible(blob, no, compat);
+	}
+}
+
 void ft_cpu_setup(void *blob, bd_t *bd)
 {
 	sys_info_t sys_info;
@@ -60,5 +97,10 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 	 * Note: aliases in the dts are required for this
 	 */
 	fdt_fixup_ethernet(blob, bd);
+
+	/*
+	 * Fixup all available PCIe nodes by setting the device_type property
+	 */
+	fdt_pcie_setup(blob);
 }
 #endif /* CONFIG_OF_LIBFDT */
diff --git a/include/asm-ppc/4xx_pcie.h b/include/asm-ppc/4xx_pcie.h
index d27d2a9..5398696 100644
--- a/include/asm-ppc/4xx_pcie.h
+++ b/include/asm-ppc/4xx_pcie.h
@@ -8,10 +8,11 @@
  * option) any later version.
  */
 
-#include <ppc4xx.h>
 #ifndef __4XX_PCIE_H
 #define __4XX_PCIE_H
 
+#include <ppc4xx.h>
+
 #define DCRN_SDR0_CFGADDR	0x00e
 #define DCRN_SDR0_CFGDATA	0x00f
 
@@ -395,6 +396,7 @@ static inline void mdelay(int n)
 		udelay(1000);
 }
 
+#if defined(PCIE0_SDR)
 static inline u32 sdr_base(int port)
 {
 	switch (port) {
@@ -409,5 +411,6 @@ static inline u32 sdr_base(int port)
 #endif
 	}
 }
+#endif /* defined(PCIE0_SDR) */
 
 #endif /* __4XX_PCIE_H */
-- 
1.5.5.1