[U-Boot] [PATCH v4 1/8] armv8: Add workaround for USB erratum A-009008

[Ran Wang]

USB High Speed (HS) EYE Height Adjustment
USB HS speed eye diagram fails with the default value at
many corners, particularly at a high temperature

Optimal eye at TXREFTUNE value to 0x9 is observed, change
set the same value.

Signed-off-by: Ran Wang <ran.wang_1 at nxp.com>
---
Change in v4:
	Change 1001 to 0x9 in the commit message to match the code.
	Clean up the math in set_usb_txvreftune().
	Rename USB_TXVREFTUNE to SCFG_USB_TXVREFTUNE.

Change in v3:
	Use inline function to make code cleaner.

Change in v2:
	In function erratum_a009008():
	1.Put a blank line after variable declaration.
	2.Move common code together.

 arch/arm/cpu/armv8/fsl-layerscape/Kconfig          |  7 ++++++
 arch/arm/cpu/armv8/fsl-layerscape/soc.c            | 26 ++++++++++++++++++++++
 .../include/asm/arch-fsl-layerscape/immap_lsch2.h  |  6 +++++
 .../include/asm/arch-fsl-layerscape/immap_lsch3.h  |  1 +
 4 files changed, 40 insertions(+)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index cdeef26fe5..d8936a4334 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -22,6 +22,7 @@ config ARCH_LS1043A
 	select SYS_FSL_ERRATUM_A009942
 	select SYS_FSL_ERRATUM_A010315
 	select SYS_FSL_ERRATUM_A010539
+	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_HAS_DDR3
 	select SYS_FSL_HAS_DDR4
 	select ARCH_EARLY_INIT_R
@@ -44,6 +45,7 @@ config ARCH_LS1046A
 	select SYS_FSL_ERRATUM_A009942
 	select SYS_FSL_ERRATUM_A010165
 	select SYS_FSL_ERRATUM_A010539
+	select SYS_FSL_ERRATUM_A009008
 	select SYS_FSL_HAS_DDR4
 	select SYS_FSL_SRDS_2
 	select ARCH_EARLY_INIT_R
@@ -80,6 +82,7 @@ config ARCH_LS2080A
 	select SYS_FSL_ERRATUM_A009942
 	select SYS_FSL_ERRATUM_A010165
 	select SYS_FSL_ERRATUM_A009203
+	select SYS_FSL_ERRATUM_A009008
 	select ARCH_EARLY_INIT_R
 	select BOARD_EARLY_INIT_F
 
@@ -223,6 +226,10 @@ config SYS_FSL_ERRATUM_A010315
 config SYS_FSL_ERRATUM_A010539
 	bool "Workaround for PIN MUX erratum A010539"
 
+config SYS_FSL_ERRATUM_A009008
+	bool "Workaround for USB PHY erratum A009008"
+
+
 config MAX_CPUS
 	int "Maximum number of CPUs permitted for Layerscape"
 	default 4 if ARCH_LS1043A
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/soc.c b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
index 639e9d2ddc..52a7abd13c 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/soc.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/soc.c
@@ -52,6 +52,30 @@ bool soc_has_aiop(void)
 	return false;
 }
 
+static inline void set_usb_txvreftune(u32 __iomem *scfg, u32 offset)
+{
+	u32 val;
+
+	val = scfg_in32(scfg + offset / 4);
+	val &= ~(0xF << 6);
+	val |= SCFG_USB_TXVREFTUNE << 6;
+	scfg_out32(scfg + offset / 4, val);
+}
+
+static void erratum_a009008(void)
+{
+#ifdef CONFIG_SYS_FSL_ERRATUM_A009008
+	u32 __iomem *scfg = (u32 __iomem *)SCFG_BASE;
+#if defined(CONFIG_ARCH_LS1043A) || defined(CONFIG_ARCH_LS1046A)
+	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB1);
+	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB2);
+	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR_USB3);
+#elif defined(CONFIG_ARCH_LS2080A)
+	set_usb_txvreftune(scfg, SCFG_USB3PRM1CR);
+#endif
+#endif /* CONFIG_SYS_FSL_ERRATUM_A009008 */
+}
+
 #if defined(CONFIG_FSL_LSCH3)
 /*
  * This erratum requires setting a value to eddrtqcr1 to
@@ -198,6 +222,7 @@ void fsl_lsch3_early_init_f(void)
 #endif
 	erratum_a008514();
 	erratum_a008336();
+	erratum_a009008();
 #ifdef CONFIG_CHAIN_OF_TRUST
 	/* In case of Secure Boot, the IBR configures the SMMU
 	* to allow only Secure transactions.
@@ -473,6 +498,7 @@ void fsl_lsch2_early_init_f(void)
 	erratum_a009929();
 	erratum_a009660();
 	erratum_a010539();
+	erratum_a009008();
 }
 #endif
 
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
index 4afc338b8e..c60d8ddfa2 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h
@@ -338,6 +338,12 @@ struct ccsr_gur {
 #define SCFG_USBPWRFAULT_USB2_SHIFT	2
 #define SCFG_USBPWRFAULT_USB1_SHIFT	0
 
+#define SCFG_BASE			0x01570000
+#define SCFG_USB3PRM1CR_USB1		0x070
+#define SCFG_USB3PRM1CR_USB2		0x07C
+#define SCFG_USB3PRM1CR_USB3		0x088
+#define SCFG_USB_TXVREFTUNE			0x9
+
 #define SCFG_SNPCNFGCR_SECRDSNP		0x80000000
 #define SCFG_SNPCNFGCR_SECWRSNP		0x40000000
 #define SCFG_SNPCNFGCR_SATARDSNP	0x00800000
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
index 59410aa7e7..01b24d03f1 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
@@ -133,6 +133,7 @@
 #define SCFG_BASE		0x01fc0000
 #define SCFG_USB3PRM1CR			0x000
 #define SCFG_USB3PRM1CR_INIT		0x27672b2a
+#define SCFG_USB_TXVREFTUNE		0x9
 #define SCFG_QSPICLKCTLR	0x10
 
 #define TP_ITYP_AV		0x00000001	/* Initiator available */
-- 
2.14.1