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ARM: sti: Add DEBUG_LL console support 

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

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Srinivas Kandagatla 2013-06-25 12:15:32 +01:00 committed by Olof Johansson
parent 15969b4577
commit 5026aecf9b
2 changed files with 96 additions and 0 deletions
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35
arch/arm/Kconfig.debug
View File

@ -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

61
arch/arm/include/debug/sti.S Normal file
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@ -0,0 +1,61 @@
/*
* 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