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authorSascha Hauer <s.hauer@pengutronix.de>2019-03-06 10:12:31 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2019-03-06 10:27:03 +0100
commit70187de497f36213e2bb243022a3474d631d19a4 (patch)
treea38fd6ec53e2eeec9a40e75a92e05a88116569af
parentb4db05f2cb2addf8b6f5933cab7903b18e966227 (diff)
downloadbarebox-70187de497f36213e2bb243022a3474d631d19a4.tar.gz
barebox-70187de497f36213e2bb243022a3474d631d19a4.tar.xz
ARM: rpi: Add mini UART debug_ll support
The raspberry pi 3 comes up with the mini UART as default, so allow to use it for debug_ll output. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--arch/arm/mach-bcm283x/include/mach/debug_ll.h37
-rw-r--r--common/Kconfig6
2 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/mach-bcm283x/include/mach/debug_ll.h b/arch/arm/mach-bcm283x/include/mach/debug_ll.h
index 2d2103e33..99c59d011 100644
--- a/arch/arm/mach-bcm283x/include/mach/debug_ll.h
+++ b/arch/arm/mach-bcm283x/include/mach/debug_ll.h
@@ -22,14 +22,51 @@
#ifdef CONFIG_DEBUG_RPI1_UART
+static inline void debug_ll_init(void)
+{
+ /* Configured by ROM */
+}
+
#define DEBUG_LL_UART_ADDR BCM2835_PL011_BASE
#include <debug_ll/pl011.h>
#elif defined CONFIG_DEBUG_RPI2_3_UART
+static inline void debug_ll_init(void)
+{
+ /* Configured by ROM */
+}
+
#define DEBUG_LL_UART_ADDR BCM2836_PL011_BASE
#include <debug_ll/pl011.h>
+#elif defined CONFIG_DEBUG_RPI3_MINI_UART
+
+static inline uint8_t debug_ll_read_reg(int reg)
+{
+ return readb(BCM2836_MINIUART_BASE + (reg << 2));
+}
+
+static inline void debug_ll_write_reg(int reg, uint8_t val)
+{
+ writeb(val, BCM2836_MINIUART_BASE + (reg << 2));
+}
+
+#define BCM2836_AUX_CLOCK_ENB 0x3f215004 /* BCM2835 AUX Clock enable register */
+#define BCM2836_AUX_CLOCK_EN_UART BIT(0) /* Bit 0 enables the Miniuart */
+
+#include <debug_ll/ns16550.h>
+
+static inline void debug_ll_init(void)
+{
+ uint16_t divisor;
+
+ writeb(BCM2836_AUX_CLOCK_EN_UART, BCM2836_AUX_CLOCK_ENB);
+
+ divisor = debug_ll_ns16550_calc_divisor(250000000 * 2);
+ debug_ll_ns16550_init(divisor);
+}
+
#endif
#endif /* __MACH_BCM2835_DEBUG_LL_H__ */
diff --git a/common/Kconfig b/common/Kconfig
index 563cf15fb..0c6acfcdd 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -1173,6 +1173,12 @@ config DEBUG_RPI2_UART
Say Y here if you want low-level debugging support on
RaspberryPi 2 and 3 boards.
+config DEBUG_RPI3_MINI_UART
+ bool "RaspberryPi 3 mini UART
+ depends on ARCH_BCM283X
+ help
+ Say Y here if you want low-level debugging support on
+ RaspberryPi 3 board mini UART.
endchoice
config DEBUG_IMX_UART_PORT