armv8/fsl-lsch2: Implement workaround for PIN MUX erratum A010539

Pin mux logic has 2 options in priority order, one is through RCW_SRC
and then through RCW_Fields. In case of QSPI booting, RCW_SRC logic
takes the priority for SPI pads and do not allow RCW_BASE and SPI_EXT
to control the SPI muxing. But actually those are DSPI controller's
pads instead of QSPI controller's, so this workaround allows RCW
fields SPI_BASE and SPI_EXT to control relevant pads muxing.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[York Sun: Reformatted commit message]
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/Kconfig

@@ -6,12 +6,17 @@ config ARCH_LS1012A
 config ARCH_LS1043A
 	bool "Freescale Layerscape LS1043A SoC"
 	select SYS_FSL_ERRATUM_A010315
+	select SYS_FSL_ERRATUM_A010539
 
 config ARCH_LS1046A
 	bool "Freescale Layerscape LS1046A SoC"
+	select SYS_FSL_ERRATUM_A010539
 
 config SYS_FSL_MMDC
 	bool "Freescale Multi Mode DDR Controller"
 
 config SYS_FSL_ERRATUM_A010315
 	bool "Workaround for PCIe erratum A010315"
+
+config SYS_FSL_ERRATUM_A010539
+	bool "Workaround for PIN MUX erratum A010539"

arch/arm/cpu/armv8/fsl-layerscape/soc.c

@@ -320,6 +320,19 @@ void erratum_a010315(void)
 }
 #endif
 
+static void erratum_a010539(void)
+{
+#if defined(CONFIG_SYS_FSL_ERRATUM_A010539) && defined(CONFIG_QSPI_BOOT)
+	struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
+	u32 porsr1;
+
+	porsr1 = in_be32(&gur->porsr1);
+	porsr1 &= ~FSL_CHASSIS2_CCSR_PORSR1_RCW_MASK;
+	out_be32((void *)(CONFIG_SYS_DCSR_DCFG_ADDR + DCFG_DCSR_PORCR1),
+		 porsr1);
+#endif
+}
+
 void fsl_lsch2_early_init_f(void)
 {
 	struct ccsr_cci400 *cci = (struct ccsr_cci400 *)CONFIG_SYS_CCI400_ADDR;
@@ -353,6 +366,7 @@ void fsl_lsch2_early_init_f(void)
 	erratum_a008850_early(); /* part 1 of 2 */
 	erratum_a009929();
 	erratum_a009660();
+	erratum_a010539();
 }
 #endif
 

arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h

@@ -168,6 +168,8 @@ struct sys_info {
 	(CONFIG_SYS_IMMR + CONFIG_SYS_FSL_JR0_OFFSET)
 
 /* Device Configuration and Pin Control */
+#define DCFG_DCSR_PORCR1		0x0
+
 struct ccsr_gur {
 	u32     porsr1;         /* POR status 1 */
 #define FSL_CHASSIS2_CCSR_PORSR1_RCW_MASK	0xFF800000