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Subject[PATCH v2] ARM: lpc32xx: debug: add low-level debug support on hsuart
Date
The lpc32xx has UARTs that are not 8250 compatible. Add support for low
level debugging on those high speed UARTs.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
Changes in v2:
- rebased on v5.11-rc1

arch/arm/Kconfig.debug | 18 +++++++++++++++---
arch/arm/include/debug/lpc32xx_hsuart.S | 24 ++++++++++++++++++++++++
2 files changed, 39 insertions(+), 3 deletions(-)
create mode 100644 arch/arm/include/debug/lpc32xx_hsuart.S

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 4ff04201a8cc..081800b030f8 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -523,7 +523,16 @@ choice
select DEBUG_UART_8250
help
Say Y here if you want kernel low-level debugging support
- on NXP LPC32xx based platforms.
+ on NXP LPC32xx based platforms using an INS16Cx50 compatible
+ UART.
+
+ config DEBUG_LPC32XX_HSUART
+ bool "Kernel low-level debugging messages via NXP LPC32xx High Speed UART"
+ depends on ARCH_LPC32XX
+ help
+ Say Y here if you want kernel low-level debugging support
+ on NXP LPC32xx based platforms using an high speed (14-clock)
+ UART.

config DEBUG_MESON_UARTAO
bool "Kernel low-level debugging via Meson6 UARTAO"
@@ -1602,6 +1611,7 @@ config DEBUG_LL_INCLUDE
DEBUG_IMX6SX_UART || \
DEBUG_IMX6UL_UART || \
DEBUG_IMX7D_UART
+ default "debug/lpc32xx_hsuart.S" if DEBUG_LPC32XX_HSUART
default "debug/msm.S" if DEBUG_QCOM_UARTDM
default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
default "debug/renesas-scif.S" if DEBUG_R7S72100_SCIF2
@@ -1686,6 +1696,7 @@ config DEBUG_UART_PHYS
default 0x40010000 if STM32MP1_DEBUG_UART
default 0x40011000 if STM32F4_DEBUG_UART || STM32F7_DEBUG_UART || \
STM32H7_DEBUG_UART
+ default 0x40014000 if DEBUG_LPC32XX_HSUART
default 0x40028000 if DEBUG_AT91_SAMV7_USART1
default 0x40081000 if DEBUG_LPC18XX_UART0
default 0x40090000 if DEBUG_LPC32XX
@@ -1781,7 +1792,7 @@ config DEBUG_UART_PHYS
DEBUG_S3C64XX_UART || \
DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
- DEBUG_AT91_UART || DEBUG_STM32_UART
+ DEBUG_AT91_UART || DEBUG_STM32_UART || DEBUG_LPC32XX_HSUART

config DEBUG_UART_VIRT
hex "Virtual base address of debug UART"
@@ -1805,6 +1816,7 @@ config DEBUG_UART_VIRT
default 0xf1c28400 if DEBUG_SUNXI_UART1
default 0xf1f02800 if DEBUG_SUNXI_R_UART
default 0xf31004c0 if DEBUG_MESON_UARTAO
+ default 0xf4014000 if DEBUG_LPC32XX_HSUART
default 0xf4090000 if DEBUG_LPC32XX
default 0xf4200000 if DEBUG_GEMINI
default 0xf6200000 if DEBUG_PXA_UART1
@@ -1891,7 +1903,7 @@ config DEBUG_UART_VIRT
DEBUG_S3C64XX_UART || \
DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
- DEBUG_AT91_UART || DEBUG_STM32_UART
+ DEBUG_AT91_UART || DEBUG_STM32_UART || DEBUG_LPC32XX_HSUART

config DEBUG_UART_8250_SHIFT
int "Register offset shift for the 8250 debug UART"
diff --git a/arch/arm/include/debug/lpc32xx_hsuart.S b/arch/arm/include/debug/lpc32xx_hsuart.S
new file mode 100644
index 000000000000..7f54bc2cc250
--- /dev/null
+++ b/arch/arm/include/debug/lpc32xx_hsuart.S
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#define LPC_HSU_TX (0x0)
+#define LPC_HSU_LEVEL (0x4)
+#define LPC_HSU_LEVEL_TX 0xFF00
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS @ System peripherals (phys address)
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT @ System peripherals (virt address)
+ .endm
+
+ .macro senduart,rd,rx
+ str \rd, [\rx, #(LPC_HSU_TX)]
+ .endm
+
+ .macro waituart,rd,rx
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldr \rd, [\rx, #(LPC_HSU_LEVEL)]
+ ands \rd, \rd, LPC_HSU_LEVEL_TX
+ bne 1001b
+ .endm
+
--
2.29.2
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