EXYNOS: SMDK5250: Support all 4 UARTs

This properly configures the mux to enable all UARTs.

This also fixes things so that we don't configure balls XUCTSN_1 and
XURTSN_1 as UART1 configuration (RTS/CTS), since they aren't
connected.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Chander kashyap <chander.kashyap@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

diff --git a/board/samsung/smdk5250/smdk5250.c b/board/samsung/smdk5250/smdk5250.c
index 928c08f9b5c78d436aa5af9f605d76a754c87666..32786e228fe33321f7d543a97666855afa0c902c 100644 (file)
--- a/board/samsung/smdk5250/smdk5250.c
+++ b/board/samsung/smdk5250/smdk5250.c
@@ -224,11 +224,51 @@ static void board_uart_init(void)
                (struct exynos5_gpio_part1 *) samsung_get_base_gpio_part1();
        int i;
 
-       /* UART1 GPIOs (part1) : GPA0CON[7:4] 0x2222 */
-       for (i = 4; i < 8; i++) {
+       /*
+        * UART0 GPIOs : GPA0CON[3:0] 0x2222
+        * Must set CFG17 switches to select UART0 to use.
+        */
+       for (i = 0; i <= 3; i++) {
                s5p_gpio_set_pull(&gpio1->a0, i, GPIO_PULL_NONE);
                s5p_gpio_cfg_pin(&gpio1->a0, i, GPIO_FUNC(0x2));
        }
+
+       /*
+        * UART1 GPIOs : GPA0CON[5:4] 0x22
+        * Must set CFG17 switches to select UART1 to use.
+        *
+        * This only sets RXD/TXD, as RTS/CTS need a resistor soldered down
+        * in order to use them (so that those pins can be used for I2C).
+        */
+       for (i = 4; i <= 5; i++) {
+               s5p_gpio_set_pull(&gpio1->a0, i, GPIO_PULL_NONE);
+               s5p_gpio_cfg_pin(&gpio1->a0, i, GPIO_FUNC(0x2));
+       }
+
+       /*
+        * UART2 GPIOs : GPA1CON[1:0] 0x22
+        * Must set CFG17 switches to select UART2 to use.
+        *
+        * This only sets RXD/TXD, as RTS/CTS need a resistor soldered down
+        * in order to use them (so that those pins can be used for I2C).
+        */
+       for (i = 0; i <= 1; i++) {
+               s5p_gpio_set_pull(&gpio1->a1, i, GPIO_PULL_NONE);
+               s5p_gpio_cfg_pin(&gpio1->a1, i, GPIO_FUNC(0x2));
+       }
+
+       /*
+        * UART3 GPIOs : GPA1CON[5:4] 0x22
+        * Must set CFG16 switches to select UART3 to use.
+        */
+       for (i = 4; i <= 5; i++) {
+               s5p_gpio_set_pull(&gpio1->a1, i, GPIO_PULL_NONE);
+               s5p_gpio_cfg_pin(&gpio1->a1, i, GPIO_FUNC(0x2));
+       }
+
+       /*
+        * There's no mux for UART4--it's internal only
+        */
 }
 
 #ifdef CONFIG_BOARD_EARLY_INIT_F