diff options
| -rw-r--r-- | drivers/misc/fsl_law.c | 39 | ||||
| -rw-r--r-- | include/asm-ppc/fsl_law.h | 1 |
2 files changed, 40 insertions, 0 deletions
diff --git a/drivers/misc/fsl_law.c b/drivers/misc/fsl_law.c index 48ece4f..e4e5c31 100644 --- a/drivers/misc/fsl_law.c +++ b/drivers/misc/fsl_law.c @@ -121,6 +121,45 @@ void print_laws(void) return; } +/* use up to 2 LAWs for DDR, used the last available LAWs */ +int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id) +{ + u64 start_align, law_sz; + int law_sz_enc; + + if (start == 0) + start_align = 1ull << (LAW_SIZE_32G + 1); + else + start_align = 1ull << (ffs64(start) - 1); + law_sz = min(start_align, sz); + law_sz_enc = __ilog2_u64(law_sz) - 1; + + if (set_last_law(start, law_sz_enc, id) < 0) + return -1; + + /* do we still have anything to map */ + sz = sz - law_sz; + if (sz) { + start += law_sz; + + start_align = 1ull << (ffs64(start) - 1); + law_sz = min(start_align, sz); + law_sz_enc = __ilog2_u64(law_sz) - 1; + + if (set_last_law(start, law_sz_enc, id) < 0) + return -1; + } else { + return 0; + } + + /* do we still have anything to map */ + sz = sz - law_sz; + if (sz) + return 1; + + return 0; +} + void init_laws(void) { int i; diff --git a/include/asm-ppc/fsl_law.h b/include/asm-ppc/fsl_law.h index 227bf83..5bba08d 100644 --- a/include/asm-ppc/fsl_law.h +++ b/include/asm-ppc/fsl_law.h @@ -75,6 +75,7 @@ struct law_entry { extern void set_law(u8 idx, phys_addr_t addr, enum law_size sz, enum law_trgt_if id); extern int set_next_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id); extern int set_last_law(phys_addr_t addr, enum law_size sz, enum law_trgt_if id); +extern int set_ddr_laws(u64 start, u64 sz, enum law_trgt_if id); extern void disable_law(u8 idx); extern void init_laws(void); extern void print_laws(void); |