uart0-helloworld-sdboot: add support for V831 SoC

V831 SoC is one of sun8i family (with Cortex-A7 CPUs), and it follows a
similar memory map with H6.

Add support for it. The detection for H6-style memory map is positive on
V831, because it have the same version of GIC at the same address.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

uart0-helloworld-sdboot.c

@@ -144,6 +144,7 @@ enum sunxi_gpio_number {
 #define SUN6I_GPH_UART0         (2)
 #define SUN8I_H3_GPA_UART0      (2)
 #define SUN8I_V3S_GPB_UART0	(3)
+#define SUN8I_V831_GPH_UART0	(5)
 #define SUN50I_H5_GPA_UART0     (2)
 #define SUN50I_H6_GPH_UART0	(2)
 #define SUN50I_A64_GPB_UART0    (4)
@@ -307,6 +308,7 @@ void soc_detection_init(void)
 #define soc_is_h6()	(soc_id == 0x1728)
 #define soc_is_r40()	(soc_id == 0x1701)
 #define soc_is_v3s()	(soc_id == 0x1681)
+#define soc_is_v831()	(soc_id == 0x1817)
 
 /* A10s and A13 share the same ID, so we need a little more effort on those */
 
@@ -382,7 +384,7 @@ void clock_init_uart_h6(void)
 
 void clock_init_uart(void)
 {
-	if (soc_is_h6())
+	if (soc_is_h6() || soc_is_v831())
 		clock_init_uart_h6();
 	else
 		clock_init_uart_legacy();
@@ -436,6 +438,10 @@ void gpio_init(void)
 		sunxi_gpio_set_cfgpin(SUNXI_GPB(8), SUN8I_V3S_GPB_UART0);
 		sunxi_gpio_set_cfgpin(SUNXI_GPB(9), SUN8I_V3S_GPB_UART0);
 		sunxi_gpio_set_pull(SUNXI_GPB(9), SUNXI_GPIO_PULL_UP);
+	} else if (soc_is_v831()) {
+		sunxi_gpio_set_cfgpin(SUNXI_GPH(9), SUN8I_V831_GPH_UART0);
+		sunxi_gpio_set_cfgpin(SUNXI_GPH(10), SUN8I_V831_GPH_UART0);
+		sunxi_gpio_set_pull(SUNXI_GPH(10), SUNXI_GPIO_PULL_UP);
 	} else {
 		/* Unknown SoC */
 		while (1) {}
@@ -512,7 +518,7 @@ int get_boot_device(void)
 	u32 *spl_signature = (void *)0x4;
 	if (soc_is_a64() || soc_is_a80() || soc_is_h5())
 		spl_signature = (void *)0x10004;
-	if (soc_is_h6())
+	if (soc_is_h6() || soc_is_v831())
 		spl_signature = (void *)0x20004;
 
 	/* Check the eGON.BT0 magic in the SPL header */
@@ -530,7 +536,7 @@ int get_boot_device(void)
 
 void bases_init(void)
 {
-	if (soc_is_h6()) {
+	if (soc_is_h6() || soc_is_v831()) {
 		pio_base = H6_PIO_BASE;
 		uart0_base = H6_UART0_BASE;
 	} else {
@@ -571,6 +577,8 @@ int main(void)
 		uart0_puts("Allwinner R40!\n");
 	else if (soc_is_v3s())
 		uart0_puts("Allwinner V3s!\n");
+	else if (soc_is_v831())
+		uart0_puts("Allwinner V831!\n");
 	else
 		uart0_puts("unknown Allwinner SoC!\n");