[PATCH v3 2/2] ARM: add lolevel debug support for asm9260

[Rob Herring]

On Mon, Nov 3, 2014 at 10:14 PM, Oleksij Rempel <linux at rempel-privat.de> wrote:
> Since there is no public documentation, this patch also provide register
> offsets for different UART units on this SoC.
>
> Signed-off-by: Oleksij Rempel <linux at rempel-privat.de>
> ---
>  arch/arm/Kconfig.debug           | 31 ++++++++++++++++++++++++++++---
>  arch/arm/include/debug/asm9260.S | 31 +++++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 3 deletions(-)
>  create mode 100644 arch/arm/include/debug/asm9260.S
>
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index d8f6a2e..66c29db 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -93,6 +93,27 @@ choice
>         prompt "Kernel low-level debugging port"
>         depends on DEBUG_LL
>
> +       config DEBUG_ASM9260_UART
> +               bool "Kernel low-level debugging via asm9260 UART"
> +               depends on MACH_ASM9260
> +               help
> +                 Say Y here if you want the debug print routines to direct
> +                 their output to an UART or USART port on asm9260 based
> +                 machines.
> +
> +                   DEBUG_UART_PHYS | DEBUG_UART_VIRT
> +
> +                   0x80000000      | 0xf0000000     | UART0
> +                   0x80004000      | 0xf0004000     | UART1
> +                   0x80008000      | 0xf0008000     | UART2
> +                   0x8000c000      | 0xf000c000     | UART3
> +                   0x80010000      | 0xf0010000     | UART4
> +                   0x80014000      | 0xf0014000     | UART5
> +                   0x80018000      | 0xf0018000     | UART6
> +                   0x8001c000      | 0xf001c000     | UART7
> +                   0x80020000      | 0xf0020000     | UART8
> +                   0x80024000      | 0xf0024000     | UART9
> +
>         config AT91_DEBUG_LL_DBGU0
>                 bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
>                 depends on HAVE_AT91_DBGU0
> @@ -1042,6 +1063,7 @@ config DEBUG_STI_UART
>  config DEBUG_LL_INCLUDE
>         string
>         default "debug/8250.S" if DEBUG_LL_UART_8250 || DEBUG_UART_8250
> +       default "debug/asm9260.S" if DEBUG_ASM9260_UART
>         default "debug/clps711x.S" if DEBUG_CLPS711X_UART1 || DEBUG_CLPS711X_UART2
>         default "debug/meson.S" if DEBUG_MESON_UARTAO
>         default "debug/pl01x.S" if DEBUG_LL_UART_PL01X || DEBUG_UART_PL01X
> @@ -1135,6 +1157,7 @@ config DEBUG_UART_PHYS
>         default 0x78000000 if DEBUG_CNS3XXX
>         default 0x7c0003f8 if FOOTBRIDGE
>         default 0x78000000 if DEBUG_CNS3XXX
> +       default 0x80010000 if DEBUG_ASM9260_UART
>         default 0x80070000 if DEBUG_IMX23_UART
>         default 0x80074000 if DEBUG_IMX28_UART
>         default 0x80230000 if DEBUG_PICOXCELL_UART
> @@ -1171,13 +1194,14 @@ config DEBUG_UART_PHYS
>                 DEBUG_LL_UART_EFM32 || \
>                 DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \
>                 DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \
> -               DEBUG_UART_BCM63XX
> +               DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART
>
>  config DEBUG_UART_VIRT
>         hex "Virtual base address of debug UART"
>         default 0xe0010fe0 if ARCH_RPC
>         default 0xe1000000 if DEBUG_MSM_UART
>         default 0xf0000be0 if ARCH_EBSA110
> +       default 0xf0010000 if DEBUG_ASM9260_UART
>         default 0xf01fb000 if DEBUG_NOMADIK_UART
>         default 0xf0201000 if DEBUG_BCM2835
>         default 0xf1000300 if DEBUG_BCM_5301X
> @@ -1244,7 +1268,7 @@ config DEBUG_UART_VIRT
>         depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
>                 DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \
>                 DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \
> -               DEBUG_UART_BCM63XX
> +               DEBUG_UART_BCM63XX || DEBUG_ASM9260_UART
>
>  config DEBUG_UART_8250_SHIFT
>         int "Register offset shift for the 8250 debug UART"
> @@ -1286,7 +1310,8 @@ config DEBUG_UNCOMPRESS
>  config UNCOMPRESS_INCLUDE
>         string
>         default "debug/uncompress.h" if ARCH_MULTIPLATFORM || ARCH_MSM || \
> -                                       PLAT_SAMSUNG || ARCH_EFM32
> +                                       PLAT_SAMSUNG || ARCH_EFM32 || \
> +                                       MACH_ASM9260

This should not be needed as multi-platform is enabled.

>         default "mach/uncompress.h"
>
>  config EARLY_PRINTK
> diff --git a/arch/arm/include/debug/asm9260.S b/arch/arm/include/debug/asm9260.S
> new file mode 100644
> index 0000000..c70d51f
> --- /dev/null
> +++ b/arch/arm/include/debug/asm9260.S
> @@ -0,0 +1,31 @@
> +/* arch/arm/mach-imx/include/mach/debug-macro.S

Wrong filename. Just remove this.

> + *
> + * Debugging macro include header
> + *
> + *  Copyright (C) 1994-1999 Russell King
> + *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
> + *  Modified for ASM9260 by Oleksij Remepl <linux at rempel-privat.de>
> + *
> + * 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.
> + *
> + */
> +
> +               .macro  addruart, rp, rv, tmp
> +               ldr     \rp, = CONFIG_DEBUG_UART_PHYS
> +               ldr     \rv, = CONFIG_DEBUG_UART_VIRT
> +               .endm
> +
> +               .macro  waituart,rd,rx
> +               .endm
> +
> +               .macro  senduart,rd,rx
> +               str     \rd, [\rx, #0x50]       @ TXDATA
> +               .endm
> +
> +               .macro  busyuart,rd,rx
> +1002:          ldr     \rd, [\rx, #0x60]       @ STAT
> +               tst     \rd, #1 << 27           @ TXEMPTY
> +               beq     1002b                   @ wait until transmit done
> +               .endm
> --
> 1.9.1
>