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ARM: bcm: Support BCMBCA debug UART

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The debug UART on the BCMBCA SoCs are in a different place
than on the other BCM platforms. Support this with a static
map when debugging is explicitly configured.

Right now I can only test this on BCM6846 so this is the
only compatible I list for the debug boardfile, but other
compatibles from the BCMBCA family can be added to get
LL_DEBUG support.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: William Zhang <william.zhang@broadcom.com>
Link: https://lore.kernel.org/r/20240923-bcm-arm-bcm6846-v2-1-f4a7191b501a@linaro.org
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
This commit is contained in:
Linus Walleij 2024-09-23 21:49:21 +02:00 committed by Florian Fainelli
parent 9852d85ec9
commit 60d76ce9fa
3 changed files with 41 additions and 3 deletions
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12
arch/arm/Kconfig.debug
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@ -242,6 +242,10 @@ choice
depends on ARCH_BCM_5301X || ARCH_BCM_NSP
select DEBUG_UART_8250
config DEBUG_BCMBCA
bool "Kernel low-level debugging on BCMBCA UART0"
depends on ARCH_BCMBCA
config DEBUG_BCM_HR2
bool "Kernel low-level debugging on Hurricane 2 UART2"
depends on ARCH_BCM_HR2
@ -1526,7 +1530,7 @@ config DEBUG_LL_INCLUDE
default "debug/vf.S" if DEBUG_VF_UART
default "debug/vt8500.S" if DEBUG_VT8500_UART0
default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1
default "debug/bcm63xx.S" if DEBUG_BCM63XX_UART
default "debug/bcm63xx.S" if DEBUG_BCM63XX_UART || DEBUG_BCMBCA
default "debug/digicolor.S" if DEBUG_DIGICOLOR_UA0
default "debug/brcmstb.S" if DEBUG_BRCMSTB_UART
default "mach/debug-macro.S"
@ -1640,6 +1644,7 @@ config DEBUG_UART_PHYS
default 0xfe531000 if DEBUG_STIH41X_SBC_ASC1
default 0xfed32000 if DEBUG_STIH41X_ASC2
default 0xff690000 if DEBUG_RK32_UART2
default 0xff800640 if DEBUG_BCMBCA
default 0xffc02000 if DEBUG_SOCFPGA_UART0
default 0xffc02100 if DEBUG_SOCFPGA_ARRIA10_UART1
default 0xffc03000 if DEBUG_SOCFPGA_CYCLONE5_UART1
@ -1664,7 +1669,7 @@ config DEBUG_UART_PHYS
DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \
DEBUG_RMOBILE_SCIFA4 || \
DEBUG_S3C64XX_UART || \
DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
DEBUG_BCM63XX_UART || DEBUG_BCMBCA || DEBUG_ASM9260_UART || \
DEBUG_DIGICOLOR_UA0 || \
DEBUG_AT91_UART || DEBUG_STM32_UART || \
DEBUG_STIH41X_ASC2 || DEBUG_STIH41X_SBC_ASC1 || \
@ -1734,6 +1739,7 @@ config DEBUG_UART_VIRT
default 0xfe018000 if DEBUG_MMP_UART3
default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
default 0xfe300000 if DEBUG_BCM_KONA_UART
default 0xfe300640 if DEBUG_BCMBCA
default 0xfeb00000 if DEBUG_HI3620_UART || DEBUG_HIX5HD2_UART
default 0xfeb24000 if DEBUG_RK3X_UART0
default 0xfeb26000 if DEBUG_RK3X_UART1
@ -1765,7 +1771,7 @@ config DEBUG_UART_VIRT
DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \
DEBUG_QCOM_UARTDM || \
DEBUG_S3C64XX_UART || \
DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
DEBUG_BCM63XX_UART || DEBUG_BCMBCA || DEBUG_ASM9260_UART || \
DEBUG_DIGICOLOR_UA0 || \
DEBUG_AT91_UART || DEBUG_STM32_UART || \
DEBUG_STIH41X_ASC2 || DEBUG_STIH41X_SBC_ASC1 || \

1
arch/arm/mach-bcm/Makefile
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@ -58,5 +58,6 @@ endif
# BCMBCA
ifeq ($(CONFIG_ARCH_BCMBCA),y)
obj-$(CONFIG_DEBUG_BCMBCA) += board_bcmbca.o
obj-$(CONFIG_SMP) += bcm63xx_smp.o bcm63xx_pmb.o
endif

31
arch/arm/mach-bcm/board_bcmbca.c Normal file
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@ -0,0 +1,31 @@
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2024 Linus Walleij <linus.walleij@linaro.org>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
/* This is needed for LL-debug/earlyprintk/debug-macro.S */
static struct map_desc bcmbca_io_desc[] __initdata = {
{
.virtual = CONFIG_DEBUG_UART_VIRT,
.pfn = __phys_to_pfn(CONFIG_DEBUG_UART_PHYS),
.length = SZ_4K,
.type = MT_DEVICE,
},
};
static void __init bcmbca_map_io(void)
{
iotable_init(bcmbca_io_desc, ARRAY_SIZE(bcmbca_io_desc));
}
static const char * const bcmbca_dt_compat[] = {
/* TODO: Add other BCMBCA SoCs here to get debug UART support */
"brcm,bcm6846",
NULL,
};
DT_MACHINE_START(BCMBCA_DT, "BCMBCA Broadband Access Processors")
.map_io = bcmbca_map_io,
.dt_compat = bcmbca_dt_compat,
MACHINE_END