From 5026aecf9bd51a95bcacdfac150f2204aafdc8c2 Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Tue, 25 Jun 2013 12:15:32 +0100 Subject: [PATCH] ARM: sti: Add DEBUG_LL console support This patch adds low level debug uart support to sti based SOCs. Signed-off-by: Srinivas Kandagatla CC: Arnd Bergmann Signed-off-by: Olof Johansson --- arch/arm/Kconfig.debug | 35 +++++++++++++++++++++ arch/arm/include/debug/sti.S | 61 ++++++++++++++++++++++++++++++++++++ 2 files changed, 96 insertions(+) create mode 100644 arch/arm/include/debug/sti.S diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 1d41908d5cda..311f6f365173 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -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 diff --git a/arch/arm/include/debug/sti.S b/arch/arm/include/debug/sti.S new file mode 100644 index 000000000000..e3aa58ff1776 --- /dev/null +++ b/arch/arm/include/debug/sti.S @@ -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