5026aecf9b
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>
62 lines
1.7 KiB
ArmAsm
62 lines
1.7 KiB
ArmAsm
/*
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* arch/arm/include/debug/sti.S
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*
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* Debugging macro include header
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* Copyright (C) 2013 STMicroelectronics (R&D) Limited.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define STIH41X_COMMS_BASE 0xfed00000
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#define STIH41X_ASC2_BASE (STIH41X_COMMS_BASE+0x32000)
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#define STIH41X_SBC_LPM_BASE 0xfe400000
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#define STIH41X_SBC_COMMS_BASE (STIH41X_SBC_LPM_BASE + 0x100000)
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#define STIH41X_SBC_ASC1_BASE (STIH41X_SBC_COMMS_BASE + 0x31000)
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#define VIRT_ADDRESS(x) (x - 0x1000000)
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#if IS_ENABLED(CONFIG_STIH41X_DEBUG_ASC2)
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#define DEBUG_LL_UART_BASE STIH41X_ASC2_BASE
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#endif
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#if IS_ENABLED(CONFIG_STIH41X_DEBUG_SBC_ASC1)
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#define DEBUG_LL_UART_BASE STIH41X_SBC_ASC1_BASE
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#endif
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#ifndef DEBUG_LL_UART_BASE
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#error "DEBUG UART is not Configured"
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#endif
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#define ASC_TX_BUF_OFF 0x04
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#define ASC_CTRL_OFF 0x0c
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#define ASC_STA_OFF 0x14
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#define ASC_STA_TX_FULL (1<<9)
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#define ASC_STA_TX_EMPTY (1<<1)
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.macro addruart, rp, rv, tmp
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ldr \rp, =DEBUG_LL_UART_BASE @ physical base
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ldr \rv, =VIRT_ADDRESS(DEBUG_LL_UART_BASE) @ virt base
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.endm
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.macro senduart,rd,rx
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strb \rd, [\rx, #ASC_TX_BUF_OFF]
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.endm
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.macro waituart,rd,rx
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1001: ldr \rd, [\rx, #ASC_STA_OFF]
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tst \rd, #ASC_STA_TX_FULL
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bne 1001b
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.endm
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.macro busyuart,rd,rx
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1001: ldr \rd, [\rx, #ASC_STA_OFF]
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tst \rd, #ASC_STA_TX_EMPTY
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beq 1001b
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.endm
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