ppc/85xx/pci: fsl_pci_init: pcie agent mode support

Originally written by Jason Jin and Mingkai Hu for mpc8536.

When QorIQ based board is configured as a PCIe agent, then unlock/enable
inbound PCI configuration cycles and init a 4K inbound memory window;
so that a PCIe host can access the PCIe agents SDRAM at address 0x0

* Supported in fsl_pci_init_port() after adding pcie_ep as a param
* Revamped copyright in drivers/pci/fsl_pci_init.c
* Mods in 85xx based board specific pci init after this change
Signed-off-by: NVivek Mahajan <vivek.mahajan@freescale.com>
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

board/freescale/mpc8572ds/mpc8572ds.c

@@ -199,7 +199,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie3_hose, first_free_busno);
+				&pcie3_hose, first_free_busno, pcie_ep);
 		/*
 		 * Activate ULI1575 legacy chip by performing a fake
 		 * memory access.  Needed to make ULI RTC work.
@@ -231,7 +231,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie2_hose, first_free_busno);
+				&pcie2_hose, first_free_busno, pcie_ep);
 	} else {
 		printf ("    PCIE2: disabled\n");
 	}
@@ -251,7 +251,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie1_hose, first_free_busno);
+				&pcie1_hose, first_free_busno, pcie_ep);
 	} else {
 		printf ("    PCIE1: disabled\n");
 	}

board/freescale/p1_p2_rdb/pci.c

@@ -71,7 +71,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie2_hose, first_free_busno);
+					&pcie2_hose, first_free_busno, pcie_ep);
 	} else {
 		printf ("    PCIE2: disabled\n");
 	}
@@ -90,7 +90,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie1_hose, first_free_busno);
+					&pcie1_hose, first_free_busno, pcie_ep);
 	} else {
 		printf ("    PCIE1: disabled\n");
 	}

board/freescale/p2020ds/p2020ds.c

@@ -227,7 +227,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie2_hose, first_free_busno);
+				&pcie2_hose, first_free_busno, pcie_ep);
 
 		/*
 		 * The workaround doesn't work on p2020 because the location
@@ -267,7 +267,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie3_hose, first_free_busno);
+				&pcie3_hose, first_free_busno, pcie_ep);
 	} else {
 		printf("    PCIE3: disabled\n");
 	}
@@ -286,7 +286,7 @@ void pci_init_board(void)
 				pcie_ep ? "End Point" : "Root Complex",
 				pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie1_hose, first_free_busno);
+				&pcie1_hose, first_free_busno, pcie_ep);
 	} else {
 		printf("    PCIE1: disabled\n");
 	}

board/sbc8548/sbc8548.c

@@ -359,7 +359,7 @@ pci_init_board(void)
 
 		SET_STD_PCI_INFO(pci_info[num], 1);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pci1_hose, first_free_busno);
+					&pci1_hose, first_free_busno, 0);
 	} else {
 		printf ("    PCI: disabled\n");
 	}
@@ -378,7 +378,7 @@ pci_init_board(void)
 		SET_STD_PCIE_INFO(pci_info[num], 1);
 		printf ("    PCIE at base address %lx\n", pci_info[num].regs);
 		first_free_busno = fsl_pci_init_port(&pci_info[num++],
-					&pcie1_hose, first_free_busno);
+					&pcie1_hose, first_free_busno, 0);
 	} else {
 		printf ("    PCIE: disabled\n");
 	}

drivers/pci/fsl_pci_init.c

 /*
- * Copyright 2007 Freescale Semiconductor, Inc.
+ * Copyright 2007-2009 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -413,13 +413,27 @@ void fsl_pci_init(struct pci_controller *hose, u32 cfg_addr, u32 cfg_data)
 }
 
 int fsl_pci_init_port(struct fsl_pci_info *pci_info,
-			struct pci_controller *hose, int busno)
+			struct pci_controller *hose, int busno, int pcie_ep)
 {
 	volatile ccsr_fsl_pci_t *pci;
 	struct pci_region *r;
 
 	pci = (ccsr_fsl_pci_t *) pci_info->regs;
 
+	if (pcie_ep) {
+		volatile pit_t *pi = &pci->pit[2];
+
+		pci_setup_indirect(hose, (u32)&pci->cfg_addr,
+					 (u32)&pci->cfg_data);
+		out_be32(&pi->pitar, 0);
+		out_be32(&pi->piwbar, 0);
+		out_be32(&pi->piwar, PIWAR_EN | PIWAR_LOCAL |
+			PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP | PIWAR_IWS_4K);
+
+		fsl_pci_config_unlock(hose);
+		return 0;
+	}
+
 	/* on non-PCIe controllers we don't have pme_msg_det so this code
 	 * should do nothing since the read will return 0
 	 */

include/asm-ppc/fsl_pci.h

@@ -62,6 +62,7 @@ typedef struct pci_inbound_window {
 #define PIWAR_LOCAL		0x00f00000
 #define PIWAR_READ_SNOOP	0x00050000
 #define PIWAR_WRITE_SNOOP	0x00005000
+#define PIWAR_IWS_4K		0x0000000b
 	u32	res2[3];
 } pit_t;
 
@@ -171,7 +172,7 @@ struct fsl_pci_info {
 };
 
 int fsl_pci_init_port(struct fsl_pci_info *pci_info,
-				struct pci_controller *hose, int busno);
+			struct pci_controller *hose, int busno, int pcie_ep);
 
 #define SET_STD_PCI_INFO(x, num) \
 {			\