board/b4860qds: Add support to make PCIe SATA work on B4860QDS

1) SerDes2 Refclks have been set properly to make
     PCIe SATA to work as it work on SerDes refclk of 100MHz
  2) Mask the SerDes's device reset request before changing
     the Refclks for SerDes1 and SerDes2 for PLL locks to
     happen properly, device reset request bit unmasked
     after SerDes refclks configuration

Signed-off-by: Shaveta Leekha <shaveta@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

arch/powerpc/include/asm/immap_85xx.h

@@ -1722,6 +1722,9 @@ typedef struct ccsr_gur {
 	u32	rstrqpblsr;	/* Reset request preboot loader status */
 	u8	res11[8];
 	u32	rstrqmr1;	/* Reset request mask */
+#ifdef CONFIG_SYS_FSL_QORIQ_CHASSIS2
+#define FSL_CORENET_RSTRQMR1_SRDS_RST_MSK      0x00000800
+#endif
 	u8	res12[4];
 	u32	rstrqsr1;	/* Reset request status */
 	u8	res13[4];

board/freescale/b4860qds/b4860qds.c

@@ -11,6 +11,7 @@
 #include <linux/compiler.h>
 #include <asm/mmu.h>
 #include <asm/processor.h>
+#include <asm/errno.h>
 #include <asm/cache.h>
 #include <asm/immap_85xx.h>
 #include <asm/fsl_law.h>
@@ -293,7 +294,8 @@ int config_serdes1_refclks(void)
 		(void *)CONFIG_SYS_FSL_CORENET_SERDES_ADDR;
 	u32 serdes1_prtcl, lane;
 	unsigned int flag_sgmii_aurora_prtcl = 0;
-	int ret, i;
+	int i;
+	int ret = 0;
 
 	serdes1_prtcl = in_be32(&gur->rcwsr[4]) &
 			FSL_CORENET2_RCWSR4_SRDS1_PRTCL;
@@ -304,10 +306,12 @@ int config_serdes1_refclks(void)
 	serdes1_prtcl >>= FSL_CORENET2_RCWSR4_SRDS1_PRTCL_SHIFT;
 	debug("Using SERDES1 Protocol: 0x%x:\n", serdes1_prtcl);
 
-	/* Clear SRDS_RSTCTL_RST bit for both PLLs before changing refclks
+	/* To prevent generation of reset request from SerDes
+	 * while changing the refclks, By setting SRDS_RST_MSK bit,
+	 * SerDes reset event cannot cause a reset request
 	 */
-	for (i = 0; i < PLL_NUM; i++)
-		clrbits_be32(&srds_regs->bank[i].rstctl, SRDS_RSTCTL_RST);
+	setbits_be32(&gur->rstrqmr1, FSL_CORENET_RSTRQMR1_SRDS_RST_MSK);
+
 	/* Reconfigure IDT idt8t49n222a device for CPRI to work
 	 * For this SerDes1's Refclk1 and refclk2 need to be set
 	 * to 122.88MHz
@@ -345,11 +349,11 @@ int config_serdes1_refclks(void)
 					SERDES_REFCLK_122_88, 0);
 			if (ret) {
 				printf("IDT8T49N222A configuration failed.\n");
-				return ret;
+				goto out;
 			} else
-				printf("IDT8T49N222A configured.\n");
+				debug("IDT8T49N222A configured.\n");
 		} else {
-			return ret;
+			goto out;
 		}
 		select_i2c_ch_pca(I2C_CH_DEFAULT);
 
@@ -400,16 +404,99 @@ int config_serdes1_refclks(void)
 		printf("WARNING:IDT8T49N222A configuration not"
 			" supported for:%x SerDes1 Protocol.\n",
 			serdes1_prtcl);
-		return -1;
 	}
 
-	return 0;
+out:
+	/* Clearing SRDS_RST_MSK bit as now
+	 * SerDes reset event can cause a reset request
+	 */
+	clrbits_be32(&gur->rstrqmr1, FSL_CORENET_RSTRQMR1_SRDS_RST_MSK);
+	return ret;
+}
+
+int config_serdes2_refclks(void)
+{
+	ccsr_gur_t *gur = (void __iomem *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
+	serdes_corenet_t *srds2_regs =
+		(void *)CONFIG_SYS_FSL_CORENET_SERDES2_ADDR;
+	u32 serdes2_prtcl;
+	int ret = 0;
+	int i;
+
+	serdes2_prtcl = in_be32(&gur->rcwsr[4]) &
+			FSL_CORENET2_RCWSR4_SRDS2_PRTCL;
+	if (!serdes2_prtcl) {
+		debug("SERDES2 is not enabled\n");
+		return -ENODEV;
+	}
+	serdes2_prtcl >>= FSL_CORENET2_RCWSR4_SRDS2_PRTCL_SHIFT;
+	debug("Using SERDES2 Protocol: 0x%x:\n", serdes2_prtcl);
+
+	/* To prevent generation of reset request from SerDes
+	 * while changing the refclks, By setting SRDS_RST_MSK bit,
+	 * SerDes reset event cannot cause a reset request
+	 */
+	setbits_be32(&gur->rstrqmr1, FSL_CORENET_RSTRQMR1_SRDS_RST_MSK);
+
+	/* Reconfigure IDT idt8t49n222a device for PCIe SATA to work
+	 * For this SerDes2's Refclk1 need to be set to 100MHz
+	 */
+	switch (serdes2_prtcl) {
+	case 0x9E:
+	case 0x9A:
+	case 0xb2:
+		debug("Configuring IDT for PCIe SATA for srds_prctl:%x\n",
+			serdes2_prtcl);
+		ret = select_i2c_ch_pca(I2C_CH_IDT);
+		if (!ret) {
+			ret = set_serdes_refclk(IDT_SERDES2_ADDRESS, 2,
+					SERDES_REFCLK_100,
+					SERDES_REFCLK_100, 0);
+			if (ret) {
+				printf("IDT8T49N222A configuration failed.\n");
+				goto out;
+			} else
+				debug("IDT8T49N222A configured.\n");
+		} else {
+			goto out;
+		}
+		select_i2c_ch_pca(I2C_CH_DEFAULT);
+
+		/* Steps For SerDes PLLs reset and reconfiguration after
+		 * changing SerDes's refclks
+		 */
+		for (i = 0; i < PLL_NUM; i++) {
+			clrbits_be32(&srds2_regs->bank[i].rstctl,
+					SRDS_RSTCTL_SDRST_B);
+			udelay(10);
+			clrbits_be32(&srds2_regs->bank[i].rstctl,
+				(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B));
+			udelay(10);
+			setbits_be32(&srds2_regs->bank[i].rstctl,
+					SRDS_RSTCTL_RST);
+			setbits_be32(&srds2_regs->bank[i].rstctl,
+				(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B
+				| SRDS_RSTCTL_SDRST_B));
+		}
+		break;
+	default:
+		printf("IDT configuration not supported for:%x S2 Protocol.\n",
+			serdes2_prtcl);
+	}
+
+out:
+	/* Clearing SRDS_RST_MSK bit as now
+	 * SerDes reset event can cause a reset request
+	 */
+	clrbits_be32(&gur->rstrqmr1, FSL_CORENET_RSTRQMR1_SRDS_RST_MSK);
+	return ret;
 }
 
 int board_early_init_r(void)
 {
 	const unsigned int flashbase = CONFIG_SYS_FLASH_BASE;
 	const u8 flash_esel = find_tlb_idx((void *)flashbase, 1);
+	int ret;
 
 	/*
 	 * Remap Boot flash + PROMJET region to caching-inhibited
@@ -442,6 +529,20 @@ int board_early_init_r(void)
 	else
 		printf("SerDes1 Refclks have been set.\n");
 
+	/* SerDes2 refclks need to be set again, as default clks
+	 * are not suitable for PCIe SATA to work
+	 * This function will set SerDes2's Refclk1 and refclk2
+	 * for SerDes2 protocols having PCIe in them
+	 * for PCIe SATA to work
+	 */
+	ret = config_serdes2_refclks();
+	if (!ret)
+		printf("SerDes2 Refclks have been set.\n");
+	else if (ret == -ENODEV)
+		printf("SerDes disable, Refclks couldn't change.\n");
+	else
+		printf("SerDes2 Refclk reconfiguring failed.\n");
+
 	/* Configure VSC3316 and VSC3308 crossbar switches */
 	if (configure_vsc3316_3308())
 		printf("VSC:failed to configure VSC3316/3308.\n");