ppc4xx: Add PCIe endpoint support on Kilauea (405EX)

This patch adds endpoint support for the AMCC Kilauea eval board. It can
be tested by connecting a reworked PCIe cable (only 1x lane singles
connected) to another root-complex.

In this test setup, a 64MB inbound window is configured at BAR0 which maps
to 0 on the PLB side. So accessing this BAR0 from the root-complex will
access the first 64MB of the SDRAM on the PPC side.

Signed-off-by: Stefan Roese <sr@denx.de>

cpu/ppc4xx/4xx_pcie.c

@@ -474,12 +474,6 @@ int __ppc4xx_init_pcie_port_hw(int port, int rootport)
 {
 	u32 val;
 
-	/*
-	 * test-only:
-	 * This needs some testing and perhaps changes for
-	 * endpoint configuration. Probably no PHY reset at all, etc.
-	 * sr, 2007-10-03
-	 */
 	if (rootport)
 		val = 0x00401000;
 	else
@@ -496,7 +490,10 @@ int __ppc4xx_init_pcie_port_hw(int port, int rootport)
 	udelay(1000);
 
 	/* deassert the PE0_hotreset */
-	SDR_WRITE(SDRN_PESDR_RCSSET(port), 0x01101000);
+	if (is_end_point(port))
+		SDR_WRITE(SDRN_PESDR_RCSSET(port), 0x01111000);
+	else
+		SDR_WRITE(SDRN_PESDR_RCSSET(port), 0x01101000);
 
 	/* poll for phy !reset */
 	while (!(SDR_READ(SDRN_PESDR_PHYSTA(port)) & 0x00001000))
@@ -903,11 +900,22 @@ int ppc4xx_setup_pcie_endpoint(struct pci_controller *hose, int port)
 #endif
 	}
 
-	/* Set up 16GB inbound memory window at 0 */
+	/* Set up 64MB inbound memory window at 0 */
 	out_le32(mbase + PCI_BASE_ADDRESS_0, 0);
 	out_le32(mbase + PCI_BASE_ADDRESS_1, 0);
-	out_le32(mbase + PECFG_BAR0HMPA, 0x7fffffc);
-	out_le32(mbase + PECFG_BAR0LMPA, 0);
+
+	out_le32(mbase + PECFG_PIM01SAH, 0xffffffff);
+	out_le32(mbase + PECFG_PIM01SAL, 0xfc000000);
+
+	/* Setup BAR0 */
+	out_le32(mbase + PECFG_BAR0HMPA, 0x7fffffff);
+	out_le32(mbase + PECFG_BAR0LMPA, 0xfc000000 | PCI_BASE_ADDRESS_MEM_TYPE_64);
+
+	/* Disable BAR1 & BAR2 */
+	out_le32(mbase + PECFG_BAR1MPA, 0);
+	out_le32(mbase + PECFG_BAR2HMPA, 0);
+	out_le32(mbase + PECFG_BAR2LMPA, 0);
+
 	out_le32(mbase + PECFG_PIM0LAL, U64_TO_U32_LOW(CFG_PCIE_INBOUND_BASE));
 	out_le32(mbase + PECFG_PIM0LAH, U64_TO_U32_HIGH(CFG_PCIE_INBOUND_BASE));
 	out_le32(mbase + PECFG_PIMEN, 0x1);
@@ -919,6 +927,9 @@ int ppc4xx_setup_pcie_endpoint(struct pci_controller *hose, int port)
 	out_le16(mbase + 0x200, 0xcaad);		/* Setting vendor ID */
 	out_le16(mbase + 0x202, 0xfeed);		/* Setting device ID */
 
+	/* Set Class Code to Processor/PPC */
+	out_le32(mbase + 0x208, 0x0b200001);
+
 	attempts = 10;
 	while(!(SDR_READ(SDRN_PESDR_RCSSTS(port)) & (1 << 8))) {
 		if (!(attempts--)) {

include/asm-ppc/4xx_pcie.h

@@ -218,7 +218,8 @@
 #define PECFG_BAR0LMPA		0x210
 #define PECFG_BAR0HMPA		0x214
 #define PECFG_BAR1MPA		0x218
-#define PECFG_BAR2MPA		0x220
+#define PECFG_BAR2LMPA		0x220
+#define PECFG_BAR2HMPA		0x224
 
 #define PECFG_PIMEN		0x33c
 #define PECFG_PIM0LAL		0x340
@@ -259,9 +260,13 @@ int pcie_hose_scan(struct pci_controller *hose, int bus);
  */
 static inline int is_end_point(int port)
 {
-	static char s[10], *tk;
+	char s[10], *tk;
+	char *pcie_mode = getenv("pcie_mode");
 
-	strcpy(s, getenv("pcie_mode"));
+	if (pcie_mode == NULL)
+		return 0;
+
+	strcpy(s, pcie_mode);
 	tk = strtok(s, ":");
 
 	switch (port) {