From f784e32b4bce0013983506b11af4b85b8ca3d36e Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Tue, 26 Aug 2008 15:01:28 -0500 Subject: [PATCH] FSL DDR: Provide a generic set_ddr_laws() Provide a helper function that will setup the last available LAWs (upto 2) for DDR. Useful for SPD/dyanmic DDR setting code. Signed-off-by: Kumar Gala --- drivers/misc/fsl_law.c | 39 +++++++++++++++++++++++++++++++++++++++ include/asm-ppc/fsl_law.h | 1 + 2 files changed, 40 insertions(+) diff --git a/drivers/misc/fsl_law.c b/drivers/misc/fsl_law.c index 48ece4f090..e4e5c3198a 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 227bf8326c..5bba08d44b 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); -- 2.25.1