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ARM: shmobile: Add early debugging support using SCIF(A) 

Add serial port debug macros for the SCIF(A) serial ports.
This includes all supported shmobile SoCs, except for EMEV2.

The configuration logic (both Kconfig and #ifdef) is more complicated than
one would expect, for several reasons:
  1. Not all SoCs have the same serial devices, and they're not always
     at the same addresses.
  2. There are two different types: SCIF and SCIFA. Fortunately they can
     easily be distinguished by physical address.
  3. Not all boards use the same serial port for the console.
     The defaults correspond to the boards that are supported in
     mainline. If you want to use a different serial port, just change
     the value of CONFIG_DEBUG_UART_PHYS, and the rest will auto-adapt.
  4. debug_ll_io_init() maps the SCIF(A) registers to a fixed virtual
     address. 0xfdxxxxxx was chosen, as it should lie below VMALLOC_END
     = 0xff000000, and must not conflict with the 2 MiB reserved region
     at PCI_IO_VIRT_BASE = 0xfee00000.
       - On SoCs not using the legacy machine_desc.map_io(),
	 debug_ll_io_init() is called by the ARM core code.
       - On SoCs using the legacy machine_desc.map_io(),
	 debug_ll_io_init() must be called explicitly. Calls are added
	 for r8a7740, r8a7779, sh7372, and sh73a0.

This was derived from the r8a7790 version by Laurent Pinchart.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2014-11-14 16:49:47 +01:00 committed by Simon Horman
parent e3d1633297
commit 7a2071c58f
7 changed files with 136 additions and 1 deletions
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1
MAINTAINERS
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@ -1387,6 +1387,7 @@ F: arch/arm/configs/lager_defconfig
F: arch/arm/configs/mackerel_defconfig
F: arch/arm/configs/marzen_defconfig
F: arch/arm/configs/shmobile_defconfig
F: arch/arm/include/debug/renesas-scif.S
F: arch/arm/mach-shmobile/
F: drivers/sh/

80
arch/arm/Kconfig.debug
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@ -653,6 +653,64 @@ choice
Say Y here if you want kernel low-level debugging support
on Rockchip RK32xx based platforms.
config DEBUG_R7S72100_SCIF2
bool "Kernel low-level debugging messages via SCIF2 on R7S72100"
depends on ARCH_R7S72100
help
Say Y here if you want kernel low-level debugging support
via SCIF2 on Renesas RZ/A1H (R7S72100).
config DEBUG_RCAR_GEN1_SCIF0
bool "Kernel low-level debugging messages via SCIF0 on R8A7778"
depends on ARCH_R8A7778
help
Say Y here if you want kernel low-level debugging support
via SCIF0 on Renesas R-Car M1A (R8A7778).
config DEBUG_RCAR_GEN1_SCIF2
bool "Kernel low-level debugging messages via SCIF2 on R8A7779"
depends on ARCH_R8A7779
help
Say Y here if you want kernel low-level debugging support
via SCIF2 on Renesas R-Car H1 (R8A7779).
config DEBUG_RCAR_GEN2_SCIF0
bool "Kernel low-level debugging messages via SCIF0 on R8A7790/R8A7791/R8A7793)"
depends on ARCH_R8A7790 || ARCH_R8A7791 || ARCH_R8A7793
help
Say Y here if you want kernel low-level debugging support
via SCIF0 on Renesas R-Car H2 (R8A7790), M2-W (R8A7791), or
M2-N (R8A7793).
config DEBUG_RCAR_GEN2_SCIF2
bool "Kernel low-level debugging messages via SCIF2 on R8A7794"
depends on ARCH_R8A7794
help
Say Y here if you want kernel low-level debugging support
via SCIF2 on Renesas R-Car E2 (R8A7794).
config DEBUG_RMOBILE_SCIFA0
bool "Kernel low-level debugging messages via SCIFA0 on R8A73A4/SH7372"
depends on ARCH_R8A73A4 || ARCH_SH7372
help
Say Y here if you want kernel low-level debugging support
via SCIFA0 on Renesas R-Mobile APE6 (R8A73A4) or SH-Mobile
AP4 (SH7372).
config DEBUG_RMOBILE_SCIFA1
bool "Kernel low-level debugging messages via SCIFA1 on R8A7740"
depends on ARCH_R8A7740
help
Say Y here if you want kernel low-level debugging support
via SCIFA1 on Renesas R-Mobile A1 (R8A7740).
config DEBUG_RMOBILE_SCIFA4
bool "Kernel low-level debugging messages via SCIFA4 on SH73A0"
depends on ARCH_SH73A0
help
Say Y here if you want kernel low-level debugging support
via SCIFA4 on Renesas SH-Mobile AG5 (SH73A0).
config DEBUG_S3C_UART0
depends on PLAT_SAMSUNG
select DEBUG_EXYNOS_UART if ARCH_EXYNOS
@ -1061,6 +1119,14 @@ config DEBUG_LL_INCLUDE
DEBUG_IMX6SX_UART
default "debug/msm.S" if DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
default "debug/renesas-scif.S" if DEBUG_R7S72100_SCIF2
default "debug/renesas-scif.S" if DEBUG_RCAR_GEN1_SCIF0
default "debug/renesas-scif.S" if DEBUG_RCAR_GEN1_SCIF2
default "debug/renesas-scif.S" if DEBUG_RCAR_GEN2_SCIF0
default "debug/renesas-scif.S" if DEBUG_RCAR_GEN2_SCIF2
default "debug/renesas-scif.S" if DEBUG_RMOBILE_SCIFA0
default "debug/renesas-scif.S" if DEBUG_RMOBILE_SCIFA1
default "debug/renesas-scif.S" if DEBUG_RMOBILE_SCIFA4
default "debug/s3c24xx.S" if DEBUG_S3C24XX_UART
default "debug/s5pv210.S" if DEBUG_S5PV210_UART
default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 || DEBUG_SIRFMARCO_UART1
@ -1152,6 +1218,12 @@ config DEBUG_UART_PHYS
default 0xd4018000 if DEBUG_MMP_UART3
default 0xe0000000 if ARCH_SPEAR13XX
default 0xe4007000 if DEBUG_HIP04_UART
default 0xe6c40000 if DEBUG_RMOBILE_SCIFA0
default 0xe6c50000 if DEBUG_RMOBILE_SCIFA1
default 0xe6c80000 if DEBUG_RMOBILE_SCIFA4
default 0xe6e58000 if DEBUG_RCAR_GEN2_SCIF2
default 0xe6e60000 if DEBUG_RCAR_GEN2_SCIF0
default 0xe8008000 if DEBUG_R7S72100_SCIF2
default 0xf0000be0 if ARCH_EBSA110
default 0xf1012000 if DEBUG_MVEBU_UART_ALTERNATE
default 0xf1012000 if ARCH_DOVE || ARCH_MV78XX0 || \
@ -1164,13 +1236,19 @@ config DEBUG_UART_PHYS
default 0xff690000 if DEBUG_RK32_UART2
default 0xffc02000 if DEBUG_SOCFPGA_UART
default 0xffd82340 if ARCH_IOP13XX
default 0xffe40000 if DEBUG_RCAR_GEN1_SCIF0
default 0xffe42000 if DEBUG_RCAR_GEN1_SCIF2
default 0xfff36000 if DEBUG_HIGHBANK_UART
default 0xfffe8600 if DEBUG_UART_BCM63XX
default 0xfffff700 if ARCH_IOP33X
depends on DEBUG_LL_UART_8250 || DEBUG_LL_UART_PL01X || \
DEBUG_LL_UART_EFM32 || \
DEBUG_UART_8250 || DEBUG_UART_PL01X || DEBUG_MESON_UARTAO || \
DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_S3C24XX_UART || \
DEBUG_MSM_UART || DEBUG_QCOM_UARTDM || DEBUG_R7S72100_SCIF2 || \
DEBUG_RCAR_GEN1_SCIF0 || DEBUG_RCAR_GEN1_SCIF2 || \
DEBUG_RCAR_GEN2_SCIF0 || DEBUG_RCAR_GEN2_SCIF2 || \
DEBUG_RMOBILE_SCIFA0 || DEBUG_RMOBILE_SCIFA1 || \
DEBUG_RMOBILE_SCIFA4 || DEBUG_S3C24XX_UART || \
DEBUG_UART_BCM63XX
config DEBUG_UART_VIRT

52
arch/arm/include/debug/renesas-scif.S Normal file
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@ -0,0 +1,52 @@
/*
* Renesas SCIF(A) debugging macro include header
*
* Based on r8a7790.S
*
* Copyright (C) 2012-2013 Renesas Electronics Corporation
* Copyright (C) 1994-1999 Russell King
*
* 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 SCIF_PHYS CONFIG_DEBUG_UART_PHYS
#define SCIF_VIRT ((SCIF_PHYS & 0x00ffffff) | 0xfd000000)
#if CONFIG_DEBUG_UART_PHYS < 0xe6e00000
/* SCIFA */
#define FTDR 0x20
#define FSR 0x14
#else
/* SCIF */
#define FTDR 0x0c
#define FSR 0x10
#endif
#define TDFE (1 << 5)
#define TEND (1 << 6)
.macro addruart, rp, rv, tmp
ldr \rp, =SCIF_PHYS
ldr \rv, =SCIF_VIRT
.endm
.macro waituart, rd, rx
1001: ldrh \rd, [\rx, #FSR]
tst \rd, #TDFE
beq 1001b
.endm
.macro senduart, rd, rx
strb \rd, [\rx, #FTDR]
ldrh \rd, [\rx, #FSR]
bic \rd, \rd, #TEND
strh \rd, [\rx, #FSR]
.endm
.macro busyuart, rd, rx
1001: ldrh \rd, [\rx, #FSR]
tst \rd, #TEND
beq 1001b
.endm

1
arch/arm/mach-shmobile/setup-r8a7740.c
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@ -71,6 +71,7 @@ static struct map_desc r8a7740_io_desc[] __initdata = {
void __init r8a7740_map_io(void)
{
debug_ll_io_init();
iotable_init(r8a7740_io_desc, ARRAY_SIZE(r8a7740_io_desc));
}

1
arch/arm/mach-shmobile/setup-r8a7779.c
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@ -70,6 +70,7 @@ static struct map_desc r8a7779_io_desc[] __initdata = {
void __init r8a7779_map_io(void)
{
debug_ll_io_init();
iotable_init(r8a7779_io_desc, ARRAY_SIZE(r8a7779_io_desc));
}

1
arch/arm/mach-shmobile/setup-sh7372.c
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@ -60,6 +60,7 @@ static struct map_desc sh7372_io_desc[] __initdata = {
void __init sh7372_map_io(void)
{
debug_ll_io_init();
iotable_init(sh7372_io_desc, ARRAY_SIZE(sh7372_io_desc));
}

1
arch/arm/mach-shmobile/setup-sh73a0.c
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@ -58,6 +58,7 @@ static struct map_desc sh73a0_io_desc[] __initdata = {
void __init sh73a0_map_io(void)
{
debug_ll_io_init();
iotable_init(sh73a0_io_desc, ARRAY_SIZE(sh73a0_io_desc));
}