Some SoCs have a Palmchip UART with a non-standard register layout.
This allows the debug console to work with these.
Signed-off-by: Mans Rullgard <m...@mansr.com>
---
Changed in v2:
- Updated to reflect actual vendor of this UART
---
arch/arm/Kconfig.debug | 8 ++++++++
arch/arm/include/debug/8250.S | 12 ++++++++++++
2 files changed, 20 insertions(+)
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 0cfd7f9..9039fff 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1597,6 +1597,14 @@ config DEBUG_UART_8250_WORD
DEBUG_BCM_KONA_UART || DEBUG_RK32_UART2 || \
DEBUG_BRCMSTB_UART
+config DEBUG_UART_8250_PALMCHIP
+ bool "8250 UART is Palmchip variant"
+ depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
+ help
+ Palmchip provides a UART implementation compatible with 16550
+ except for having a different register layout. Say Y here if
+ the debug UART is of this type.
+
config DEBUG_UART_8250_FLOW_CONTROL
bool "Enable flow control for 8250 UART"
depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
diff --git a/arch/arm/include/debug/8250.S b/arch/arm/include/debug/8250.S
index 7f7446f..2332f40 100644
--- a/arch/arm/include/debug/8250.S
+++ b/arch/arm/include/debug/8250.S
@@ -9,6 +9,18 @@
*/
#include <linux/serial_reg.h>
+#ifdef CONFIG_DEBUG_UART_8250_PALMCHIP
+
+#undef UART_TX
+#undef UART_LSR
+#undef UART_MSR
+
+#define UART_TX 1
+#define UART_LSR 7
+#define UART_MSR 8
+
+#endif
+
.macro addruart, rp, rv, tmp
ldr \rp, =CONFIG_DEBUG_UART_PHYS
ldr \rv, =CONFIG_DEBUG_UART_VIRT
--
2.5.3
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