ppc4xx: Pass PCIe root-complex/endpoint configuration to Linux via the fdt

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@denx.de>

diff --git a/cpu/ppc4xx/fdt.c b/cpu/ppc4xx/fdt.c
index afcb9740685770a00cc6b30b222078fd2bd710a7..1f4d6f27fdd4af16065fdb1d7a3fb3bde059dabc 100644 (file)
--- 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 d27d2a965ce7da89ef1fa39d9eebb92d830207fd..539869683800e43018cd1ba2ac0b1b3ccaffb293 100644 (file)
--- 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 */