powerpc/85xx: Handle PCIe initialization requires for P1021 class SoCs

The P1011, P1012, P1015, P1016, P1020, P1021, P1024, & P1025 SoCs require
that we initialize the SERDES registers if the lanes are configured for
PCIe.  Additionally these devices PCIe controller do not support ASPM
and we have to explicitly disable it.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/cpu/mpc85xx/p1021_serdes.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 Freescale Semiconductor, Inc.
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -26,6 +26,24 @@
 #include <asm/immap_85xx.h>
 #include <asm/fsl_serdes.h>
 
+typedef struct serdes_85xx {
+	u32	srdscr0;	/* 0x00 - SRDS Control Register 0 */
+	u32	srdscr1;	/* 0x04 - SRDS Control Register 1 */
+	u32	srdscr2;	/* 0x08 - SRDS Control Register 2 */
+	u32	srdscr3;	/* 0x0C - SRDS Control Register 3 */
+	u32	srdscr4;	/* 0x10 - SRDS Control Register 4 */
+} serdes_85xx_t;
+#define FSL_SRDSCR3_EIC0(x)	(((x) & 0x1f) << 8)
+#define FSL_SRDSCR3_EIC0_MASK	FSL_SRDSCR3_EIC0(0x1f)
+#define FSL_SRDSCR3_EIC1(x)	(((x) & 0x1f) << 0)
+#define FSL_SRDSCR3_EIC1_MASK	FSL_SRDSCR3_EIC1(0x1f)
+#define FSL_SRDSCR4_EIC2(x)	(((x) & 0x1f) << 8)
+#define FSL_SRDSCR4_EIC2_MASK	FSL_SRDSCR4_EIC2(0x1f)
+#define FSL_SRDSCR4_EIC3(x)	(((x) & 0x1f) << 0)
+#define FSL_SRDSCR4_EIC3_MASK	FSL_SRDSCR4_EIC3(0x1f)
+#define EIC_PCIE	0x13
+#define EIC_SGMII	0x04
+
 #define SRDS1_MAX_LANES		4
 
 static u32 serdes1_prtcl_map;
@@ -45,10 +63,13 @@ int is_serdes_configured(enum srds_prtcl prtcl)
 void fsl_serdes_init(void)
 {
 	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	serdes_85xx_t *serdes = (void *)CONFIG_SYS_MPC85xx_SERDES1_ADDR;
+
 	u32 pordevsr = in_be32(&gur->pordevsr);
 	u32 srds_cfg = (pordevsr & MPC85xx_PORDEVSR_IO_SEL) >>
 				MPC85xx_PORDEVSR_IO_SEL_SHIFT;
 	int lane;
+	u32 mask, val;
 
 	debug("PORDEVSR[IO_SEL_SRDS] = %x\n", srds_cfg);
 
@@ -61,4 +82,30 @@ void fsl_serdes_init(void)
 		enum srds_prtcl lane_prtcl = serdes1_cfg_tbl[srds_cfg][lane];
 		serdes1_prtcl_map |= (1 << lane_prtcl);
 	}
+
+	/* Init SERDES Receiver electrical idle detection control for PCIe */
+
+	/* Lane 0 is always PCIe 1 */
+	mask = FSL_SRDSCR3_EIC0_MASK;
+	val = FSL_SRDSCR3_EIC0(EIC_PCIE);
+
+	/* Lane 1 */
+	if ((serdes1_cfg_tbl[srds_cfg][1] == PCIE1) ||
+	    (serdes1_cfg_tbl[srds_cfg][1] == PCIE2)) {
+		mask |= FSL_SRDSCR3_EIC1_MASK;
+		val |= FSL_SRDSCR3_EIC1(EIC_PCIE);
+	}
+
+	/* Handle lanes 0 & 1 */
+	clrsetbits_be32(&serdes->srdscr3, mask, val);
+
+	/* Handle lanes 2 & 3 */
+	if (srds_cfg == 0x6) {
+		mask = FSL_SRDSCR4_EIC2_MASK | FSL_SRDSCR4_EIC3_MASK;
+		val = FSL_SRDSCR4_EIC2(EIC_PCIE) | FSL_SRDSCR4_EIC3(EIC_PCIE);
+		clrsetbits_be32(&serdes->srdscr4, mask, val);
+	}
+
+	/* 100 ms delay */
+	udelay(100000);
 }

arch/powerpc/include/asm/config_mpc85xx.h

@@ -90,12 +90,14 @@
 #define CONFIG_MAX_CPUS			1
 #define CONFIG_SYS_FSL_NUM_LAWS		12
 #define CONFIG_TSECV2
+#define CONFIG_FSL_PCIE_DISABLE_ASPM
 #define CONFIG_SYS_FSL_SEC_COMPAT	2
 
 #elif defined(CONFIG_P1012)
 #define CONFIG_MAX_CPUS			1
 #define CONFIG_SYS_FSL_NUM_LAWS		12
 #define CONFIG_TSECV2
+#define CONFIG_FSL_PCIE_DISABLE_ASPM
 #define CONFIG_SYS_FSL_SEC_COMPAT	2
 
 #elif defined(CONFIG_P1013)
@@ -117,12 +119,14 @@
 #define CONFIG_MAX_CPUS			2
 #define CONFIG_SYS_FSL_NUM_LAWS		12
 #define CONFIG_TSECV2
+#define CONFIG_FSL_PCIE_DISABLE_ASPM
 #define CONFIG_SYS_FSL_SEC_COMPAT	2
 
 #elif defined(CONFIG_P1021)
 #define CONFIG_MAX_CPUS			2
 #define CONFIG_SYS_FSL_NUM_LAWS		12
 #define CONFIG_TSECV2
+#define CONFIG_FSL_PCIE_DISABLE_ASPM
 #define CONFIG_SYS_FSL_SEC_COMPAT	2
 
 #elif defined(CONFIG_P1022)

drivers/pci/fsl_pci_init.c

@@ -317,6 +317,13 @@ void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info)
 	temp32 |= 0xf000e;		/* set URR, FER, NFER (but not CER) */
 	pci_hose_write_config_dword(hose, dev, PCI_DCR, temp32);
 
+#if defined(CONFIG_FSL_PCIE_DISABLE_ASPM)
+	temp32 = 0;
+	pci_hose_read_config_dword(hose, dev, PCI_LCR, &temp32);
+	temp32 &= ~0x03;		/* Disable ASPM  */
+	pci_hose_write_config_dword(hose, dev, PCI_LCR, temp32);
+	udelay(1);
+#endif
 	if (pcie_cap == PCI_CAP_ID_EXP) {
 		pci_hose_read_config_word(hose, dev, PCI_LTSSM, &ltssm);
 		enabled = ltssm >= PCI_LTSSM_L0;

include/pci.h

@@ -306,6 +306,7 @@
 #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 */