powerpc/pcie: add PCIe version 3.x support

T4240 PCIe IP is version 3.0 and has some update comparing previous
QorIQ products.

1.  Move Freescale specific register define
to
arch/powerpc/include/asm/fsl_pci.h
and update the register offset define for T4240.

2. add the status/control register define
use status/control register to judge the link status

3. The original code uses 'Programming Interface' field to judge if PCIE is
EP or RC mode, however, T4240 does not support this functionality.
According to PCIE specification, 'Header Type' offset 0x0e is used to
indicate header type, so for PCIE controller, the patch changes code to
use 'Header Type' field to identify if the PCIE is RC or EP mode.

This patch fixes  the PCIe card link up issue on T4240QDS.

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>

arch/powerpc/include/asm/config_mpc85xx.h

@@ -578,6 +578,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A005871
 #define CONFIG_SYS_FSL_ERRATUM_A006593
 #define CONFIG_SYS_CCSRBAR_DEFAULT	0xfe000000
+#define CONFIG_SYS_FSL_PCI_VER_3_X
 
 #ifdef CONFIG_PPC_B4860
 #define CONFIG_SYS_FSL_CORES_PER_CLUSTER 4

arch/powerpc/include/asm/fsl_pci.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2007,2009-2011 Freescale Semiconductor, Inc.
+ * Copyright 2007,2009-2012 Freescale Semiconductor, Inc.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
@@ -13,6 +13,34 @@
 
 #define PEX_IP_BLK_REV_2_2	0x02080202
 #define PEX_IP_BLK_REV_2_3	0x02080203
+#define PEX_IP_BLK_REV_3_0	0x02080300
+
+/* Freescale-specific PCI config registers */
+#define FSL_PCI_PBFR		0x44
+
+#ifdef CONFIG_SYS_FSL_PCI_VER_3_X
+/* Currently only the PCIe capability is used, so hardcode the offset.
+ * if more capabilities need to be justified, the capability link method
+ * should be applied here
+ */
+#define FSL_PCIE_CAP_ID		0x70
+#define PCI_DCR		0x78    /* PCIe Device Control Register */
+#define PCI_DSR		0x7a    /* PCIe Device Status Register */
+#define PCI_LSR		0x82    /* PCIe Link Status Register */
+#define PCI_LCR		0x80    /* PCIe Link Control Register */
+#else
+#define FSL_PCIE_CAP_ID		0x4c
+#define PCI_DCR		0x54    /* PCIe Device Control Register */
+#define PCI_DSR		0x56    /* PCIe Device Status Register */
+#define PCI_LSR		0x5e    /* PCIe Link Status Register */
+#define PCI_LCR		0x5c    /* PCIe Link Control Register */
+#endif
+
+#define FSL_PCIE_CFG_RDY	0x4b0
+#define FSL_PROG_IF_AGENT	0x1
+
+#define PCI_LTSSM	0x404   /* PCIe Link Training, Status State Machine */
+#define  PCI_LTSSM_L0	0x16    /* L0 state */
 
 int fsl_setup_hose(struct pci_controller *hose, unsigned long addr);
 int fsl_is_pci_agent(struct pci_controller *hose);
@@ -149,7 +177,10 @@ typedef struct ccsr_pci {
 	u32	perr_cap3;	/* 0xe34 - PCIE Error Capture Register 3 */
 	char	res23[200];
 	u32	pdb_stat;	/* 0xf00 - PCIE Debug Status */
-	char	res24[252];
+	char	res24[16];
+	u32	pex_csr0;	/* 0xf14 - PEX Control/Status register 0*/
+	u32	pex_csr1;	/* 0xf18 - PEX Control/Status register 1*/
+	char	res25[228];
 } ccsr_fsl_pci_t;
 #define PCIE_CONFIG_PC	0x00020000
 #define PCIE_CONFIG_OB_CK	0x00002000

drivers/pci/fsl_pci_init.c

@@ -28,12 +28,6 @@ DECLARE_GLOBAL_DATA_PTR;
 #include <asm/io.h>
 #include <asm/fsl_pci.h>
 
-/* Freescale-specific PCI config registers */
-#define FSL_PCI_PBFR		0x44
-#define FSL_PCIE_CAP_ID		0x4c
-#define FSL_PCIE_CFG_RDY	0x4b0
-#define FSL_PROG_IF_AGENT	0x1
-
 #ifndef CONFIG_SYS_PCI_MEMORY_BUS
 #define CONFIG_SYS_PCI_MEMORY_BUS 0
 #endif
@@ -424,6 +418,15 @@ void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info)
 	udelay(1);
 #endif
 	if (pcie_cap == PCI_CAP_ID_EXP) {
+		if (block_rev >= PEX_IP_BLK_REV_3_0) {
+#define PEX_CSR0_LTSSM_MASK	0xFC
+#define PEX_CSR0_LTSSM_SHIFT	2
+			ltssm = (in_be32(&pci->pex_csr0)
+				& PEX_CSR0_LTSSM_MASK) >> PEX_CSR0_LTSSM_SHIFT;
+			enabled = (ltssm == 0x11) ? 1 : 0;
+		} else {
+		/* pci_hose_read_config_word(hose, dev, PCI_LTSSM, &ltssm); */
+		/* enabled = ltssm >= PCI_LTSSM_L0; */
 		pci_hose_read_config_word(hose, dev, PCI_LTSSM, &ltssm);
 		enabled = ltssm >= PCI_LTSSM_L0;
 
@@ -456,6 +459,7 @@ void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info)
 					PCI_BASE_ADDRESS_0, pcicsrbar);
 		}
 #endif
+	}
 
 #ifdef CONFIG_SYS_P4080_ERRATUM_PCIE_A003
 		if (enabled == 0) {
@@ -564,6 +568,10 @@ int fsl_is_pci_agent(struct pci_controller *hose)
 		u8 prog_if;
 
 		pci_hose_read_config_byte(hose, dev, PCI_CLASS_PROG, &prog_if);
+		/* Programming Interface (PCI_CLASS_PROG)
+		 * 0 == pci host or pcie root-complex,
+		 * 1 == pci agent or pcie end-point
+		 */
 		return (prog_if == FSL_PROG_IF_AGENT);
 	}
 }

include/pci.h

@@ -410,13 +410,6 @@
 #define PCI_MAX_PCI_DEVICES	32
 #define PCI_MAX_PCI_FUNCTIONS	8
 
-#define PCI_DCR		0x54    /* PCIe Device Control Register */
-#define PCI_DSR		0x56    /* PCIe Device Status Register */
-#define PCI_LSR		0x5e    /* PCIe Link Status Register */
-#define PCI_LCR		0x5c    /* PCIe Link Control Register */
-#define PCI_LTSSM	0x404   /* PCIe Link Training, Status State Machine */
-#define  PCI_LTSSM_L0	0x16    /* L0 state */
-
 /* Include the ID list */
 
 #include <pci_ids.h>