diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2014-11-21 13:04:06 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2014-11-21 13:04:06 +0100 |
| commit | 6febbf472b6f3df1b6a137fe246ac88dcd5b2c0e (patch) | |
| tree | 96d30ffad60888ff22285782950564c3eea87d0b /arch/arm/include/debug | |
| parent | 00f879bed45148612e1065ac26e46a7a39e5c8d9 (diff) | |
| parent | 7a2071c58f36450fbf44a27d2e5d371c18534a25 (diff) | |
Merge tag 'renesas-soc4-for-v3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into next/soc
Pull "Fourth Round of Renesas ARM Based SoC Updates for v3.19" from Simon Horman:
* Add early debugging support using SCIF(A)
* tag 'renesas-soc4-for-v3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
ARM: shmobile: Add early debugging support using SCIF(A)
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/include/debug')
| -rw-r--r-- | arch/arm/include/debug/renesas-scif.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/arm/include/debug/renesas-scif.S b/arch/arm/include/debug/renesas-scif.S new file mode 100644 index 00000000000..97820a8df51 --- /dev/null +++ b/arch/arm/include/debug/renesas-scif.S @@ -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 |