armv8/ls2085aqds: DSPI pin muxing configure through QIXIS

DSPI has pin muxing with SDHC and other IPs, this patch check the
value of RCW SPI_PCS_BASE and SPI_BASE_BASE fields, it also check
the "hwconfig" variable. If those pins are configured to DSPI and
"hwconfig" enable DSPI, set the BRDCFG5 of QIXIS FPGA to configure
the routing to on-board SPI memory. Otherwise will configure to SDHC.
DSPI is enabled in "hwconfig" by appending "dspi", eg.
setenv hwconfig "$hwconfig;dspi"

Signed-off-by: Haikun Wang <haikun.wang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

arch/arm/include/asm/arch-fsl-lsch3/config.h

@@ -137,6 +137,8 @@
 #define DCFG_PORSR1			0x000
 #define DCFG_PORSR1_RCW_SRC		0xff800000
 #define DCFG_PORSR1_RCW_SRC_NOR		0x12f00000
+#define DCFG_RCWSR13			0x130
+#define DCFG_RCWSR13_DSPI		(0 << 8)
 
 #define DCFG_DCSR_BASE		0X700100000ULL
 #define DCFG_DCSR_PORCR1		0x000

board/freescale/ls2085aqds/ls2085aqds.c

@@ -17,12 +17,23 @@
 #include <environment.h>
 #include <i2c.h>
 #include <asm/arch-fsl-lsch3/soc.h>
+#include <hwconfig.h>
 
 #include "../common/qixis.h"
 #include "ls2085aqds_qixis.h"
 
+#define PIN_MUX_SEL_SDHC	0x00
+#define PIN_MUX_SEL_DSPI	0x0a
+
+#define SET_SDHC_MUX_SEL(reg, value)	((reg & 0xf0) | value)
+
 DECLARE_GLOBAL_DATA_PTR;
 
+enum {
+	MUX_TYPE_SDHC,
+	MUX_TYPE_DSPI,
+};
+
 unsigned long long get_qixis_addr(void)
 {
 	unsigned long long addr;
@@ -153,10 +164,47 @@ int select_i2c_ch_pca9547(u8 ch)
 	return 0;
 }
 
+int config_board_mux(int ctrl_type)
+{
+	u8 reg5;
+
+	reg5 = QIXIS_READ(brdcfg[5]);
+
+	switch (ctrl_type) {
+	case MUX_TYPE_SDHC:
+		reg5 = SET_SDHC_MUX_SEL(reg5, PIN_MUX_SEL_SDHC);
+		break;
+	case MUX_TYPE_DSPI:
+		reg5 = SET_SDHC_MUX_SEL(reg5, PIN_MUX_SEL_DSPI);
+		break;
+	default:
+		printf("Wrong mux interface type\n");
+		return -1;
+	}
+
+	QIXIS_WRITE(brdcfg[5], reg5);
+
+	return 0;
+}
+
 int board_init(void)
 {
+	char *env_hwconfig;
+	u32 __iomem *dcfg_ccsr = (u32 __iomem *)DCFG_BASE;
+	u32 val;
+
 	init_final_memctl_regs();
 
+	val = in_le32(dcfg_ccsr + DCFG_RCWSR13 / 4);
+
+	env_hwconfig = getenv("hwconfig");
+
+	if (hwconfig_f("dspi", env_hwconfig) &&
+	    DCFG_RCWSR13_DSPI == (val & (u32)(0xf << 8)))
+		config_board_mux(MUX_TYPE_DSPI);
+	else
+		config_board_mux(MUX_TYPE_SDHC);
+
 #ifdef CONFIG_ENV_IS_NOWHERE
 	gd->env_addr = (ulong)&default_environment[0];
 #endif