diff options
Diffstat (limited to 'arch/arm/include/debug/keystone.S')
| -rw-r--r-- | arch/arm/include/debug/keystone.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/include/debug/keystone.S b/arch/arm/include/debug/keystone.S new file mode 100644 index 000000000000..9aef9ba3f4f0 --- /dev/null +++ b/arch/arm/include/debug/keystone.S @@ -0,0 +1,43 @@ +/* + * Early serial debug output macro for Keystone SOCs + * + * Copyright 2013 Texas Instruments, Inc. + * Santosh Shilimkar <santosh.shilimkar@ti.com> + * + * Based on RMKs low level debug code. + * 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. + */ + +#include <linux/serial_reg.h> + +#define UART_SHIFT 2 +#if defined(CONFIG_DEBUG_KEYSTONE_UART0) +#define UART_PHYS 0x02530c00 +#define UART_VIRT 0xfeb30c00 +#elif defined(CONFIG_DEBUG_KEYSTONE_UART1) +#define UART_PHYS 0x02531000 +#define UART_VIRT 0xfeb31000 +#endif + + .macro addruart, rp, rv, tmp + ldr \rv, =UART_VIRT @ physical base address + ldr \rp, =UART_PHYS @ virtual base address + .endm + + .macro senduart,rd,rx + str \rd, [\rx, #UART_TX << UART_SHIFT] + .endm + + .macro busyuart,rd,rx +1002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT] + and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE + teq \rd, #UART_LSR_TEMT | UART_LSR_THRE + bne 1002b + .endm + + .macro waituart,rd,rx + .endm |