Commit 5026aecf authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Olof Johansson
Browse files

ARM: sti: Add DEBUG_LL console support 



This patch adds low level debug uart support to sti based SOCs.

Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@st.com>
CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 15969b45

arch/arm/Kconfig.debug

+35 −0
Original line number Diff line number Diff line
@@ -483,6 +483,16 @@ choice 
		  This option selects UART0 on VIA/Wondermedia System-on-a-chip

		  devices, including VT8500, WM8505, WM8650 and WM8850.



	config DEBUG_STI_UART

		depends on ARCH_STI

		bool "Use StiH415/416 ASC for low-level debug"

		help

		  Say Y here if you want kernel low-level debugging support

		  on StiH415/416 based platforms like B2000, B2020.

		  It support UART2 and SBC_UART1.



		  If unsure, say N.



	config DEBUG_LL_UART_NONE

		bool "No low-level debugging UART"

		depends on !ARCH_MULTIPLATFORM
@@ -617,6 +627,30 @@ choice 


endchoice



choice

	prompt "Low-level debug console UART"

	depends on DEBUG_LL && DEBUG_STI_UART



	config STIH41X_DEBUG_ASC2

		bool "ASC2 UART"

		help

		  Say Y here if you want kernel low-level debugging support

		  on STiH415/416 based platforms like b2000, which has

		  default UART wired up to ASC2.



		  If unsure, say N.



	config STIH41X_DEBUG_SBC_ASC1

		bool "SBC ASC1 UART"

		help

		  Say Y here if you want kernel low-level debugging support

		  on STiH415/416 based platforms like b2020. which has

		  default UART wired up to SBC ASC1.



		  If unsure, say N.



endchoice



config DEBUG_LL_INCLUDE

	string

	default "debug/bcm2835.S" if DEBUG_BCM2835
@@ -641,6 +675,7 @@ config DEBUG_LL_INCLUDE 
				 DEBUG_MMP_UART3

	default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1

	default "debug/socfpga.S" if DEBUG_SOCFPGA_UART

	default "debug/sti.S" if DEBUG_STI_UART

	default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1

	default "debug/tegra.S" if DEBUG_TEGRA_UART

	default "debug/ux500.S" if DEBUG_UX500_UART

arch/arm/include/debug/sti.S

0 → 100644
+61 −0
Original line number Diff line number Diff line 
/*

 * arch/arm/include/debug/sti.S

 *

 * Debugging macro include header

 * Copyright (C) 2013 STMicroelectronics (R&D) Limited.

 *

 * 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.

 */



#define STIH41X_COMMS_BASE              0xfed00000

#define STIH41X_ASC2_BASE               (STIH41X_COMMS_BASE+0x32000)



#define STIH41X_SBC_LPM_BASE            0xfe400000

#define STIH41X_SBC_COMMS_BASE          (STIH41X_SBC_LPM_BASE + 0x100000)

#define STIH41X_SBC_ASC1_BASE           (STIH41X_SBC_COMMS_BASE + 0x31000)





#define VIRT_ADDRESS(x)		(x - 0x1000000)



#if IS_ENABLED(CONFIG_STIH41X_DEBUG_ASC2)

#define DEBUG_LL_UART_BASE	STIH41X_ASC2_BASE

#endif



#if IS_ENABLED(CONFIG_STIH41X_DEBUG_SBC_ASC1)

#define DEBUG_LL_UART_BASE	STIH41X_SBC_ASC1_BASE

#endif



#ifndef DEBUG_LL_UART_BASE

#error "DEBUG UART is not Configured"

#endif



#define ASC_TX_BUF_OFF  0x04

#define ASC_CTRL_OFF    0x0c

#define ASC_STA_OFF     0x14



#define ASC_STA_TX_FULL         (1<<9)

#define ASC_STA_TX_EMPTY        (1<<1)





		.macro	addruart, rp, rv, tmp

		ldr	\rp,      =DEBUG_LL_UART_BASE	@ physical base

		ldr	\rv,      =VIRT_ADDRESS(DEBUG_LL_UART_BASE) @ virt base

		.endm



                .macro  senduart,rd,rx

                strb    \rd, [\rx, #ASC_TX_BUF_OFF]

                .endm



                .macro  waituart,rd,rx

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

                tst     \rd, #ASC_STA_TX_FULL

                bne     1001b

                .endm



                .macro  busyuart,rd,rx

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

                tst     \rd, #ASC_STA_TX_EMPTY

                beq     1001b

                .endm

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