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Commit b51312be authored by Florian Fainelli's avatar Florian Fainelli
Browse files

ARM: BCM63XX: add low-level UART debug support 



Broadcom BCM63xx DSL SoCs have a different UART implementation for which
we need specially crafted low-level debug assembly code to support. Add
support for this using the standard definitions provided in
include/linux/serial_bcm63xx.h (shared with their MIPS counterparts).

Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent dc6aec60

arch/arm/Kconfig.debug

+16 −2
Original line number Diff line number Diff line
@@ -122,6 +122,11 @@ choice 
		  mobile SoCs in the Kona family of chips (e.g. bcm28155,

		  bcm11351, etc...)



	config DEBUG_BCM63XX

		bool "Kernel low-level debugging on BCM63XX UART"

		depends on ARCH_BCM_63XX

		select DEBUG_UART_BCM63XX



	config DEBUG_BERLIN_UART

		bool "Marvell Berlin SoC Debug UART"

		depends on ARCH_BERLIN
@@ -1038,6 +1043,7 @@ config DEBUG_LL_INCLUDE 
	default "debug/vf.S" if DEBUG_VF_UART

	default "debug/vt8500.S" if DEBUG_VT8500_UART0

	default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1

	default "debug/bcm63xx.S" if DEBUG_UART_BCM63XX

	default "mach/debug-macro.S"



# Compatibility options for PL01x
@@ -1057,6 +1063,10 @@ config DEBUG_UART_8250 
		ARCH_IOP33X || ARCH_IXP4XX || \

		ARCH_LPC32XX || ARCH_MV78XX0 || ARCH_ORION5X || ARCH_RPC



# Compatibility options for BCM63xx

config DEBUG_UART_BCM63XX

	def_bool ARCH_BCM_63XX



config DEBUG_UART_PHYS

	hex "Physical base address of debug UART"

	default 0x01c20000 if DEBUG_DAVINCI_DMx_UART0
@@ -1122,11 +1132,13 @@ config DEBUG_UART_PHYS 
	default 0xffc02000 if DEBUG_SOCFPGA_UART

	default 0xffd82340 if ARCH_IOP13XX

	default 0xfff36000 if DEBUG_HIGHBANK_UART

	default 0xfffe8600 if DEBUG_UART_BCM63XX

	default 0xfffff700 if ARCH_IOP33X

	depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \

		DEBUG_LL_UART_EFM32 || \

		DEBUG_UART_8250 || DEBUG_UART_PL01X || \

		DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART

		DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \

		DEBUG_UART_BCM63XX



config DEBUG_UART_VIRT

	hex "Virtual base address of debug UART"
@@ -1157,6 +1169,7 @@ config DEBUG_UART_VIRT 
	default 0xfa71e000 if DEBUG_QCOM_UARTDM

	default 0xfb009000 if DEBUG_REALVIEW_STD_PORT

	default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT

	default 0xfcfe8600 if DEBUG_UART_BCM63XX

	default 0xfd000000 if ARCH_SPEAR3XX || ARCH_SPEAR6XX

	default 0xfd000000 if ARCH_SPEAR13XX

	default 0xfd012000 if ARCH_MV78XX0
@@ -1194,7 +1207,8 @@ config DEBUG_UART_VIRT 
	default DEBUG_UART_PHYS if !MMU

	depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \

		DEBUG_UART_8250 || DEBUG_UART_PL01X || \

		DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART

		DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \

		DEBUG_UART_BCM63XX



config DEBUG_UART_8250_SHIFT

	int "Register offset shift for the 8250 debug UART"

arch/arm/include/debug/bcm63xx.S

0 → 100644
+33 −0
Original line number Diff line number Diff line 
/*

 * Broadcom BCM63xx low-level UART debug

 *

 * Copyright (C) 2014 Broadcom Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/serial_bcm63xx.h>



	.macro	addruart, rp, rv, tmp

	ldr	\rp, =CONFIG_DEBUG_UART_PHYS

	ldr	\rv, =CONFIG_DEBUG_UART_VIRT

	.endm



	.macro	senduart, rd, rx

	/* word access do not work */

	strb	\rd, [\rx, #UART_FIFO_REG]

	.endm



	.macro	waituart, rd, rx

1001:	ldr	\rd, [\rx, #UART_IR_REG]

	tst	\rd, #(1 << UART_IR_TXEMPTY)

	beq	1001b

	.endm



	.macro	busyuart, rd, rx

1002:	ldr	\rd, [\rx, #UART_IR_REG]

	tst	\rd, #(1 << UART_IR_TXTRESH)

	beq	1002b

	.endm