[U-Boot] [PATCH v3 7/8] armv7: Add workaround for USB erratum A-008997

[Suresh Gupta]

From: Suresh Gupta <suresh.gupta at freescale.com>

Low Frequency Periodic Signaling (LFPS) Peak-to-Peak Differential
Output Voltage Test Compliance fails using default transmitter settings

Change settings required for transmitter signal swings to pass
compliance tests.

Signed-off-by: Sriram Dash <sriram.dash at nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat at nxp.com>
Signed-off-by: Suresh Gupta <suresh.gupta at nxp.com>
---
Changes in v2:
	Clean up the code after Scott comments, 
	Previously in v1, we was defining the pointer as u32,
	then casting it to u8, and then passing it to
	a 16-bit accessor.

Changes in v3: None
		
 arch/arm/cpu/armv7/ls102xa/Kconfig                |  4 ++++
 arch/arm/cpu/armv7/ls102xa/soc.c                  | 16 ++++++++++++++++
 arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h |  9 +++++++++
 3 files changed, 29 insertions(+)

diff --git a/arch/arm/cpu/armv7/ls102xa/Kconfig b/arch/arm/cpu/armv7/ls102xa/Kconfig
index 7e12565..cbd4ab6 100644
--- a/arch/arm/cpu/armv7/ls102xa/Kconfig
+++ b/arch/arm/cpu/armv7/ls102xa/Kconfig
@@ -7,6 +7,7 @@ config ARCH_LS1021A
 	select SYS_FSL_ERRATUM_A010315
 	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_ERRATUM_A009798
+	select SYS_FSL_ERRATUM_A008997
 	select SYS_FSL_SRDS_1
 	select SYS_HAS_SERDES
 	select SYS_FSL_DDR_BE if SYS_FSL_DDR
@@ -58,6 +59,9 @@ config SYS_FSL_ERRATUM_A009008
 config SYS_FSL_ERRATUM_A009798
 	bool "Workaround for USB PHY erratum A009798"
 
+config SYS_FSL_ERRATUM_A008997
+	bool "Workaround for USB PHY erratum A008997"
+
 config SYS_FSL_SRDS_1
 	bool
 
diff --git a/arch/arm/cpu/armv7/ls102xa/soc.c b/arch/arm/cpu/armv7/ls102xa/soc.c
index 7ae5b29..3d6cc5f 100644
--- a/arch/arm/cpu/armv7/ls102xa/soc.c
+++ b/arch/arm/cpu/armv7/ls102xa/soc.c
@@ -79,6 +79,21 @@ static void erratum_a009798(void)
 #endif /* CONFIG_SYS_FSL_ERRATUM_A009798 */
 }
 
+static void erratum_a008997(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A008997
+	void __iomem *usb_phy = (void __iomem *)USB_PHY_BASE;
+	writew(USB_PHY_TX_OVRD_DRV_LO_VAL,
+	       usb_phy + USB_PHY_TX_OVRD_DRV_LO);
+	writew(USB_PHY_MPLL_OVRD_IN_HI_VAL,
+	       usb_phy + USB_PHY_MPLL_OVRD_IN_HI);
+	writew(USB_PHY_LEVEL_OVRD_IN_VAL,
+	       usb_phy + USB_PHY_LEVEL_OVRD_IN);
+	writew(USB_PHY_TX_OVRD_IN_HI_VAL,
+	       usb_phy + USB_PHY_TX_OVRD_IN_HI);
+#endif /* CONFIG_SYS_FSL_ERRATUM_A008997 */
+}
+
 void s_init(void)
 {
 }
@@ -168,6 +183,7 @@ int arch_soc_init(void)
 	/* Erratum */
 	erratum_a009008();
 	erratum_a009798();
+	erratum_a008997();
 
 	return 0;
 }
diff --git a/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h b/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h
index 8cafa07..c0e4372 100644
--- a/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h
+++ b/arch/arm/include/asm/arch-ls102xa/immap_ls102xa.h
@@ -177,6 +177,15 @@ struct ccsr_gur {
 #define SCFG_USB3PRM1CR			0x070
 #define USB_TXVREFTUNE			0x9
 #define USB_SQRXTUNE			0xFC7FFFFF
+#define USB_PHY_BASE			0x08510000
+#define USB_PHY_TX_OVRD_DRV_LO		0x2004
+#define USB_PHY_MPLL_OVRD_IN_HI		0x0024
+#define USB_PHY_LEVEL_OVRD_IN		0x002a
+#define USB_PHY_TX_OVRD_IN_HI		0x2002
+#define USB_PHY_TX_OVRD_DRV_LO_VAL	0x784C
+#define USB_PHY_MPLL_OVRD_IN_HI_VAL	0x0080
+#define USB_PHY_LEVEL_OVRD_IN_VAL	0xA9A5
+#define USB_PHY_TX_OVRD_IN_HI_VAL	0x0003
 
 /* Supplemental Configuration Unit */
 struct ccsr_scfg {
-- 
1.9.3