powerpc/b4860: Add workaround for errata A006384 and A006475

SerDes PLLs may not lock reliably at 5 G VCO configuration(A006384)
and at cold temperatures(A006475), workaround recalibrate the
PLLs with some SerDes configuration

Both these errata are only applicable for b4 rev1.
So, make workaround for these errata conditional,
depending upon soc version.

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

1 files changed, 193 insertions, 0 deletions

diff --git a/board/freescale/b4860qds/b4860qds.c b/board/freescale/b4860qds/b4860qds.c
index 24a709e..d9c88a0 100644
--- a/board/freescale/b4860qds/b4860qds.c
+++ b/board/freescale/b4860qds/b4860qds.c
@@ -288,6 +288,182 @@ int configure_vsc3316_3308(void)
 	return 0;
 }
 
+static int calibrate_pll(serdes_corenet_t *srds_regs, int pll_num)
+{
+	u32 rst_err;
+
+	/* Steps For SerDes PLLs reset and reconfiguration
+	 * or PLL power-up procedure
+	 */
+	debug("CALIBRATE PLL:%d\n", pll_num);
+	clrbits_be32(&srds_regs->bank[pll_num].rstctl,
+			SRDS_RSTCTL_SDRST_B);
+	udelay(10);
+	clrbits_be32(&srds_regs->bank[pll_num].rstctl,
+		(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B));
+	udelay(10);
+	setbits_be32(&srds_regs->bank[pll_num].rstctl,
+			SRDS_RSTCTL_RST);
+	setbits_be32(&srds_regs->bank[pll_num].rstctl,
+		(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B
+		| SRDS_RSTCTL_SDRST_B));
+
+	udelay(20);
+
+	/* Check whether PLL has been locked or not */
+	rst_err = in_be32(&srds_regs->bank[pll_num].rstctl) &
+				SRDS_RSTCTL_RSTERR;
+	rst_err >>= SRDS_RSTCTL_RSTERR_SHIFT;
+	debug("RST_ERR value for PLL %d is: 0x%x:\n", pll_num, rst_err);
+	if (rst_err)
+		return rst_err;
+
+	return rst_err;
+}
+
+static int check_pll_locks(serdes_corenet_t *srds_regs, int pll_num)
+{
+	int ret = 0;
+	u32 fcap, dcbias, bcap, pllcr1, pllcr0;
+
+	if (calibrate_pll(srds_regs, pll_num)) {
+		/* STEP 1 */
+		/* Read fcap, dcbias and bcap value */
+		clrbits_be32(&srds_regs->bank[pll_num].pllcr0,
+				SRDS_PLLCR0_DCBIAS_OUT_EN);
+		fcap = in_be32(&srds_regs->bank[pll_num].pllsr2) &
+					SRDS_PLLSR2_FCAP;
+		fcap >>= SRDS_PLLSR2_FCAP_SHIFT;
+		bcap = in_be32(&srds_regs->bank[pll_num].pllsr2) &
+					SRDS_PLLSR2_BCAP_EN;
+		bcap >>= SRDS_PLLSR2_BCAP_EN_SHIFT;
+		setbits_be32(&srds_regs->bank[pll_num].pllcr0,
+				SRDS_PLLCR0_DCBIAS_OUT_EN);
+		dcbias = in_be32(&srds_regs->bank[pll_num].pllsr2) &
+					SRDS_PLLSR2_DCBIAS;
+		dcbias >>= SRDS_PLLSR2_DCBIAS_SHIFT;
+		debug("values of bcap:%x, fcap:%x and dcbias:%x\n",
+					bcap, fcap, dcbias);
+		if (fcap == 0 && bcap == 1) {
+			/* Step 3 */
+			clrbits_be32(&srds_regs->bank[pll_num].rstctl,
+				(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B
+				 | SRDS_RSTCTL_SDRST_B));
+			clrbits_be32(&srds_regs->bank[pll_num].pllcr1,
+					SRDS_PLLCR1_BCAP_EN);
+			setbits_be32(&srds_regs->bank[pll_num].pllcr1,
+					SRDS_PLLCR1_BCAP_OVD);
+			if (calibrate_pll(srds_regs, pll_num)) {
+				/*save the fcap, dcbias and bcap values*/
+				clrbits_be32(&srds_regs->bank[pll_num].pllcr0,
+						SRDS_PLLCR0_DCBIAS_OUT_EN);
+				fcap = in_be32(&srds_regs->bank[pll_num].pllsr2)
+					& SRDS_PLLSR2_FCAP;
+				fcap >>= SRDS_PLLSR2_FCAP_SHIFT;
+				bcap = in_be32(&srds_regs->bank[pll_num].pllsr2)
+					& SRDS_PLLSR2_BCAP_EN;
+				bcap >>= SRDS_PLLSR2_BCAP_EN_SHIFT;
+				setbits_be32(&srds_regs->bank[pll_num].pllcr0,
+						SRDS_PLLCR0_DCBIAS_OUT_EN);
+				dcbias = in_be32
+					(&srds_regs->bank[pll_num].pllsr2) &
+							SRDS_PLLSR2_DCBIAS;
+				dcbias >>= SRDS_PLLSR2_DCBIAS_SHIFT;
+
+				/* Step 4*/
+				clrbits_be32(&srds_regs->bank[pll_num].rstctl,
+				(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B
+				 | SRDS_RSTCTL_SDRST_B));
+				setbits_be32(&srds_regs->bank[pll_num].pllcr1,
+						SRDS_PLLCR1_BYP_CAL);
+				clrbits_be32(&srds_regs->bank[pll_num].pllcr1,
+						SRDS_PLLCR1_BCAP_EN);
+				setbits_be32(&srds_regs->bank[pll_num].pllcr1,
+						SRDS_PLLCR1_BCAP_OVD);
+				/* change the fcap and dcbias to the saved
+				 * values from Step 3 */
+				clrbits_be32(&srds_regs->bank[pll_num].pllcr1,
+							SRDS_PLLCR1_PLL_FCAP);
+				pllcr1 = (in_be32
+					(&srds_regs->bank[pll_num].pllcr1)|
+					(fcap << SRDS_PLLCR1_PLL_FCAP_SHIFT));
+				out_be32(&srds_regs->bank[pll_num].pllcr1,
+							pllcr1);
+				clrbits_be32(&srds_regs->bank[pll_num].pllcr0,
+						SRDS_PLLCR0_DCBIAS_OVRD);
+				pllcr0 = (in_be32
+				(&srds_regs->bank[pll_num].pllcr0)|
+				(dcbias << SRDS_PLLCR0_DCBIAS_OVRD_SHIFT));
+				out_be32(&srds_regs->bank[pll_num].pllcr0,
+							pllcr0);
+				ret = calibrate_pll(srds_regs, pll_num);
+				if (ret)
+					return ret;
+			} else {
+				goto out;
+			}
+		} else { /* Step 5 */
+			clrbits_be32(&srds_regs->bank[pll_num].rstctl,
+				(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B
+				 | SRDS_RSTCTL_SDRST_B));
+			udelay(10);
+			/* Change the fcap, dcbias, and bcap to the
+			 * values from Step 1 */
+			setbits_be32(&srds_regs->bank[pll_num].pllcr1,
+					SRDS_PLLCR1_BYP_CAL);
+			clrbits_be32(&srds_regs->bank[pll_num].pllcr1,
+						SRDS_PLLCR1_PLL_FCAP);
+			pllcr1 = (in_be32(&srds_regs->bank[pll_num].pllcr1)|
+				(fcap << SRDS_PLLCR1_PLL_FCAP_SHIFT));
+			out_be32(&srds_regs->bank[pll_num].pllcr1,
+						pllcr1);
+			clrbits_be32(&srds_regs->bank[pll_num].pllcr0,
+						SRDS_PLLCR0_DCBIAS_OVRD);
+			pllcr0 = (in_be32(&srds_regs->bank[pll_num].pllcr0)|
+				(dcbias << SRDS_PLLCR0_DCBIAS_OVRD_SHIFT));
+			out_be32(&srds_regs->bank[pll_num].pllcr0,
+						pllcr0);
+			clrbits_be32(&srds_regs->bank[pll_num].pllcr1,
+					SRDS_PLLCR1_BCAP_EN);
+			setbits_be32(&srds_regs->bank[pll_num].pllcr1,
+					SRDS_PLLCR1_BCAP_OVD);
+			ret = calibrate_pll(srds_regs, pll_num);
+			if (ret)
+				return ret;
+		}
+	}
+out:
+	return 0;
+}
+
+static int check_serdes_pll_locks(void)
+{
+	serdes_corenet_t *srds1_regs =
+		(void *)CONFIG_SYS_FSL_CORENET_SERDES_ADDR;
+	serdes_corenet_t *srds2_regs =
+		(void *)CONFIG_SYS_FSL_CORENET_SERDES2_ADDR;
+	int i, ret1, ret2;
+
+	debug("\nSerDes1 Lock check\n");
+	for (i = 0; i < CONFIG_SYS_FSL_SRDS_NUM_PLLS; i++) {
+		ret1 = check_pll_locks(srds1_regs, i);
+		if (ret1) {
+			printf("SerDes1, PLL:%d didnt lock\n", i);
+			return ret1;
+		}
+	}
+	debug("\nSerDes2 Lock check\n");
+	for (i = 0; i < CONFIG_SYS_FSL_SRDS_NUM_PLLS; i++) {
+		ret2 = check_pll_locks(srds2_regs, i);
+		if (ret2) {
+			printf("SerDes2, PLL:%d didnt lock\n", i);
+			return ret2;
+		}
+	}
+
+	return 0;
+}
+
 int config_serdes1_refclks(void)
 {
 	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
@@ -478,6 +654,8 @@ int config_serdes2_refclks(void)
 			setbits_be32(&srds2_regs->bank[i].rstctl,
 				(SRDS_RSTCTL_SDEN | SRDS_RSTCTL_PLLRST_B
 				| SRDS_RSTCTL_SDRST_B));
+
+			udelay(10);
 		}
 		break;
 	default:
@@ -544,6 +722,21 @@ int board_early_init_r(void)
 	else
 		printf("SerDes2 Refclk reconfiguring failed.\n");
 
+#if defined(CONFIG_SYS_FSL_ERRATUM_A006384) || \
+			defined(CONFIG_SYS_FSL_ERRATUM_A006475)
+	/* Rechecking the SerDes locks after all SerDes configurations
+	 * are done, As SerDes PLLs may not lock reliably at 5 G VCO
+	 * and at cold temperatures.
+	 * Following sequence ensure the proper locking of SerDes PLLs.
+	 */
+	if (SVR_MAJ(get_svr()) == 1) {
+		if (check_serdes_pll_locks())
+			printf("SerDes plls still not locked properly.\n");
+		else
+			printf("SerDes plls have been locked well.\n");
+	}
+#endif
+
 	/* Configure VSC3316 and VSC3308 crossbar switches */
 	if (configure_vsc3316_3308())
 		printf("VSC:failed to configure VSC3316/3308.\n");