[U-Boot] [PATCH 8/9] ARM: sunxi: Add support for using R_UART as console

Chen-Yu Tsai
2014-10-07T07:11:56Z

The A23 only has UART0 muxed with MMC0. Some of the boards we
encountered expose R_UART as a set of pads.

Add support for R_UART so we can have a console while using mmc.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
arch/arm/cpu/armv7/sunxi/board.c | 4 ++++
arch/arm/cpu/armv7/sunxi/clock_sun6i.c | 6 ++++++
arch/arm/include/asm/arch-sunxi/cpu.h | 1 +
arch/arm/include/asm/arch-sunxi/gpio.h | 3 +++
include/configs/sunxi-common.h | 1 +
5 files changed, 15 insertions(+)

diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c
index 61c1ba9..aeb2c2f 100644
--- a/arch/arm/cpu/armv7/sunxi/board.c
+++ b/arch/arm/cpu/armv7/sunxi/board.c
@@ -75,6 +75,10 @@ int gpio_init(void)
sunxi_gpio_set_cfgpin(SUNXI_GPG(3), SUN5I_GPG3_UART1_TX);
sunxi_gpio_set_cfgpin(SUNXI_GPG(4), SUN5I_GPG4_UART1_RX);
sunxi_gpio_set_pull(SUNXI_GPG(4), SUNXI_GPIO_PULL_UP);
+#elif CONFIG_CONS_INDEX == 5 && defined(CONFIG_SUN8I)
+ sunxi_gpio_set_cfgpin(SUNXI_GPL(2), SUN8I_GPL2_R_UART_TX);
+ sunxi_gpio_set_cfgpin(SUNXI_GPL(3), SUN8I_GPL3_R_UART_RX);
+ sunxi_gpio_set_pull(SUNXI_GPL(3), SUNXI_GPIO_PULL_UP);
#else
#error Unsupported console port number. Please fix pin mux settings in board.c
#endif
diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
index 8387b93..1eae976 100644
--- a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
+++ b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
@@ -13,6 +13,7 @@
#include <common.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
+#include <asm/arch/prcm.h>
#include <asm/arch/sys_proto.h>

void clock_init_uart(void)
@@ -20,6 +21,7 @@ void clock_init_uart(void)
struct sunxi_ccm_reg *const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;

+#if CONFIG_CONS_INDEX < 5
/* uart clock source is apb2 */
writel(APB2_CLK_SRC_OSC24M|
APB2_CLK_RATE_N_1|
@@ -35,6 +37,10 @@ void clock_init_uart(void)
setbits_le32(&ccm->apb2_reset_cfg,
1 << (APB2_RESET_UART_SHIFT +
CONFIG_CONS_INDEX - 1));
+#else
+ /* enable R_PIO and R_UART clocks, and de-assert resets */
+ prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_UART);
+#endif

/* Dup with clock_init_safe(), drop once sun6i SPL support lands */
writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
diff --git a/arch/arm/include/asm/arch-sunxi/cpu.h b/arch/arm/include/asm/arch-sunxi/cpu.h
index 313e6c8..0de79a0 100644
--- a/arch/arm/include/asm/arch-sunxi/cpu.h
+++ b/arch/arm/include/asm/arch-sunxi/cpu.h
@@ -111,6 +111,7 @@
#define SUNXI_AVG_BASE 0x01ea0000

#define SUNXI_PRCM_BASE 0x01f01400
+#define SUNXI_R_UART_BASE 0x01f02800
#define SUNXI_R_PIO_BASE 0x01f02c00
#define SUNXI_P2WI_BASE 0x01f03400

diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
index bbe815a..c216960 100644
--- a/arch/arm/include/asm/arch-sunxi/gpio.h
+++ b/arch/arm/include/asm/arch-sunxi/gpio.h
@@ -164,6 +164,9 @@ enum sunxi_gpio_number {

#define SUN4I_GPI4_SDC3 2

+#define SUN8I_GPL2_R_UART_TX 2
+#define SUN8I_GPL3_R_UART_RX 2
+
/* GPIO pin pull-up/down config */
#define SUNXI_GPIO_PULL_DISABLE 0
#define SUNXI_GPIO_PULL_UP 1
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index 7857a56..7e54296 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -42,6 +42,7 @@
#define CONFIG_SYS_NS16550_COM2 SUNXI_UART1_BASE
#define CONFIG_SYS_NS16550_COM3 SUNXI_UART2_BASE
#define CONFIG_SYS_NS16550_COM4 SUNXI_UART3_BASE
+#define CONFIG_SYS_NS16550_COM5 SUNXI_R_UART_BASE

/* DRAM Base */
#define CONFIG_SYS_SDRAM_BASE 0x40000000
--
2.1.1