tegra: add alternate UART1 funcmux entry

(In at least some configurations) Whistler uses UART1 on pingroups
UAA, UAB.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NTom Warren <twarren@nvidia.com>

arch/arm/cpu/armv7/tegra2/board.c

@@ -101,6 +101,18 @@ int arch_cpu_init(void)
 }
 #endif
 
+static int uart_configs[] = {
+#ifdef CONFIG_TEGRA2_UARTA_UAA_UAB
+	FUNCMUX_UART1_UAA_UAB,
+#else
+	FUNCMUX_UART1_IRRX_IRTX,
+#endif
+	FUNCMUX_UART2_IRDA,
+	-1,
+	FUNCMUX_UART4_GMC,
+	-1,
+};
+
 /**
  * Set up the specified uarts
  *
@@ -120,7 +132,7 @@ static void setup_uarts(int uart_ids)
 		if (uart_ids & (1 << i)) {
 			enum periph_id id = id_for_uart[i];
 
-			funcmux_select(id, FUNCMUX_DEFAULT);
+			funcmux_select(id, uart_configs[i]);
 			clock_ll_start_uart(id);
 		}
 	}

arch/arm/cpu/armv7/tegra2/funcmux.c

@@ -31,11 +31,22 @@ int funcmux_select(enum periph_id id, int config)
 
 	switch (id) {
 	case PERIPH_ID_UART1:
-		if (config == FUNCMUX_UART1_IRRX_IRTX) {
+		switch (config) {
+		case FUNCMUX_UART1_IRRX_IRTX:
 			pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
 			pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
 			pinmux_tristate_disable(PINGRP_IRRX);
 			pinmux_tristate_disable(PINGRP_IRTX);
+			break;
+		case FUNCMUX_UART1_UAA_UAB:
+			pinmux_set_func(PINGRP_UAA, PMUX_FUNC_UARTA);
+			pinmux_set_func(PINGRP_UAB, PMUX_FUNC_UARTA);
+			pinmux_tristate_disable(PINGRP_UAA);
+			pinmux_tristate_disable(PINGRP_UAB);
+			bad_config = 0;
+			break;
+		}
+		if (!bad_config) {
 			/*
 			 * Tegra appears to boot with function UARTA pre-
 			 * selected on mux group SDB. If two mux groups are

arch/arm/include/asm/arch-tegra2/funcmux.h

@@ -30,6 +30,7 @@ enum {
 
 	/* UART configs */
 	FUNCMUX_UART1_IRRX_IRTX = 0,
+	FUNCMUX_UART1_UAA_UAB,
 	FUNCMUX_UART2_IRDA = 0,
 	FUNCMUX_UART4_GMC = 0,