board: starfive: spl: Support jtag for VisionFive2 board

JTAG pins are mapped as below. To access the JTAG pins, we need to
control the GPIO pins from SPL which seems to be the earliest stage for
JTAG.

- JTAG nTRST:	GPIO36 / Input
- JTAG TDI:	GPIO61 / Input
- JTAG TMS:	GPIO63 / Input
- JTAG TCK:	GPIO60 / Input
- JTAG TDO:	GPIO44 / Output

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

board/starfive/visionfive2/spl.c

@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <asm/arch/eeprom.h>
+#include <asm/arch/gpio.h>
 #include <asm/arch/regs.h>
 #include <asm/arch/spl.h>
 #include <asm/io.h>
@@ -172,10 +173,32 @@ void spl_perform_fixups(struct spl_image_info *spl_image)
 	/* Update the memory size which read form eeprom or DT */
 	fdt_fixup_memory(spl_image->fdt_addr, 0x40000000, gd->ram_size);
 }
+
+static void jh7110_jtag_init(void)
+{
+	/* nTRST: GPIO36 */
+	SYS_IOMUX_DOEN(36, HIGH);
+	SYS_IOMUX_DIN(36, 4);
+	/* TDI: GPIO61 */
+	SYS_IOMUX_DOEN(61, HIGH);
+	SYS_IOMUX_DIN(61, 19);
+	/* TMS: GPIO63 */
+	SYS_IOMUX_DOEN(63, HIGH);
+	SYS_IOMUX_DIN(63, 20);
+	/* TCK: GPIO60 */
+	SYS_IOMUX_DOEN(60, HIGH);
+	SYS_IOMUX_DIN(60, 29);
+	/* TDO: GPIO44 */
+	SYS_IOMUX_DOEN(44, 8);
+	SYS_IOMUX_DOUT(44, 22);
+}
+
 int spl_board_init_f(void)
 {
 	int ret;
 
+	jh7110_jtag_init();
+
 	ret = spl_soc_init();
 	if (ret) {
 		debug("JH7110 SPL init failed: %d\n", ret);