linux-kernel - [PATCH] ARM: lpc32xx: debug: add low-level debug support on hsuart

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Date:   Mon, 14 Jan 2019 22:16:23 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH] ARM: lpc32xx: debug: add low-level debug support on hsuart

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@...tlin.com>
---
 arch/arm/Kconfig.debug                  | 18 +++++++++++++++---
 arch/arm/include/debug/lpc32xx_hsuart.S | 22 ++++++++++++++++++++++
 2 files changed, 37 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 6d6e0330930b..0d4d64f5d3b7 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -530,7 +530,16 @@ 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"
@@ -1541,6 +1550,7 @@ config DEBUG_LL_INCLUDE
 				 DEBUG_IMX6UL_UART || \
 				 DEBUG_IMX7D_UART
 	default "debug/ks8695.S" if DEBUG_KS8695_UART
+	default "debug/lpc32xx_hsuart.S" if DEBUG_LPC32XX_HSUART
 	default "debug/msm.S" if DEBUG_QCOM_UARTDM
 	default "debug/netx.S" if DEBUG_NETX_UART
 	default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
@@ -1622,6 +1632,7 @@ config DEBUG_UART_PHYS
 	default 0x3e000000 if DEBUG_BCM_KONA_UART
 	default 0x3f201000 if DEBUG_BCM2836
 	default 0x4000e400 if DEBUG_LL_UART_EFM32
+	default 0x40014000 if DEBUG_LPC32XX_HSUART
 	default 0x40028000 if DEBUG_AT91_SAMV7_USART1
 	default 0x40081000 if DEBUG_LPC18XX_UART0
 	default 0x40090000 if DEBUG_LPC32XX
@@ -1716,7 +1727,7 @@ config DEBUG_UART_PHYS
 		DEBUG_S3C64XX_UART || \
 		DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
 		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
-		DEBUG_AT91_UART
+		DEBUG_AT91_UART || DEBUG_LPC32XX_HSUART
 
 config DEBUG_UART_VIRT
 	hex "Virtual base address of debug UART"
@@ -1741,6 +1752,7 @@ 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
@@ -1832,7 +1844,7 @@ config DEBUG_UART_VIRT
 		DEBUG_S3C64XX_UART || \
 		DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
 		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
-		DEBUG_AT91_UART
+		DEBUG_AT91_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..e0205368c6ff
--- /dev/null
+++ b/arch/arm/include/debug/lpc32xx_hsuart.S
@@ -0,0 +1,22 @@
+#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
+
-- 
2.20.1