diff options
Diffstat (limited to 'board/rsdproto/flash_asm.S')
| -rw-r--r-- | board/rsdproto/flash_asm.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/board/rsdproto/flash_asm.S b/board/rsdproto/flash_asm.S new file mode 100644 index 00000000000..c65fb870406 --- /dev/null +++ b/board/rsdproto/flash_asm.S @@ -0,0 +1,39 @@ +/* + * -*- mode:c -*- + * + * (C) Copyright 2000 + * Marius Groeger <mgroeger@sysgo.de> + * Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * + * void ull_write(unsigned long long volatile *address, + * unsigned long long volatile *data) + * r3 = address + * r4 = data + * + * void ull_read(unsigned long long volatile *address, + * unsigned long long volatile *data) + * r3 = address + * r4 = data + * + * Uses the floating point unit to read and write 64 bit wide + * data (unsigned long long) on the 60x bus. This is necessary + * because all 4 flash chips use the /WE line from byte lane 0 + * + * IMPORTANT: data should always be 8-aligned, otherwise an exception will + * occur. + */ + +#include <ppc_asm.tmpl> +#include <ppc_defs.h> + +.globl ull_write +ull_write: + lfd 0,0(r4) + stfd 0,0(r3) + blr + + .globl ull_read +ull_read: + lfd 0, 0(r3) + stfd 0, 0(r4) + blr |