Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 1 | /* |
| 2 | * CAAM/SEC 4.x functions for using scatterlists in caam driver |
| 3 | * |
| 4 | * Copyright 2008-2011 Freescale Semiconductor, Inc. |
| 5 | * |
| 6 | */ |
| 7 | |
Horia Geantă | 261ea05 | 2016-05-19 18:11:26 +0300 | [diff] [blame^] | 8 | #include "regs.h" |
| 9 | |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 10 | struct sec4_sg_entry; |
| 11 | |
| 12 | /* |
| 13 | * convert single dma address to h/w link table format |
| 14 | */ |
| 15 | static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr, |
Cristian Stoica | bd52f1c | 2016-05-19 18:11:18 +0300 | [diff] [blame] | 16 | dma_addr_t dma, u32 len, u16 offset) |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 17 | { |
Horia Geantă | 261ea05 | 2016-05-19 18:11:26 +0300 | [diff] [blame^] | 18 | sec4_sg_ptr->ptr = cpu_to_caam_dma(dma); |
| 19 | sec4_sg_ptr->len = cpu_to_caam32(len); |
| 20 | sec4_sg_ptr->bpid_offset = cpu_to_caam32(offset & SEC4_SG_OFFSET_MASK); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 21 | #ifdef DEBUG |
| 22 | print_hex_dump(KERN_ERR, "sec4_sg_ptr@: ", |
| 23 | DUMP_PREFIX_ADDRESS, 16, 4, sec4_sg_ptr, |
| 24 | sizeof(struct sec4_sg_entry), 1); |
| 25 | #endif |
| 26 | } |
| 27 | |
| 28 | /* |
| 29 | * convert scatterlist to h/w link table format |
| 30 | * but does not have final bit; instead, returns last entry |
| 31 | */ |
| 32 | static inline struct sec4_sg_entry * |
| 33 | sg_to_sec4_sg(struct scatterlist *sg, int sg_count, |
Cristian Stoica | bd52f1c | 2016-05-19 18:11:18 +0300 | [diff] [blame] | 34 | struct sec4_sg_entry *sec4_sg_ptr, u16 offset) |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 35 | { |
| 36 | while (sg_count) { |
| 37 | dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), |
| 38 | sg_dma_len(sg), offset); |
| 39 | sec4_sg_ptr++; |
Cristian Stoica | 5be4d4c | 2015-01-20 10:06:16 +0200 | [diff] [blame] | 40 | sg = sg_next(sg); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 41 | sg_count--; |
| 42 | } |
| 43 | return sec4_sg_ptr - 1; |
| 44 | } |
| 45 | |
| 46 | /* |
| 47 | * convert scatterlist to h/w link table format |
| 48 | * scatterlist must have been previously dma mapped |
| 49 | */ |
| 50 | static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count, |
| 51 | struct sec4_sg_entry *sec4_sg_ptr, |
Cristian Stoica | bd52f1c | 2016-05-19 18:11:18 +0300 | [diff] [blame] | 52 | u16 offset) |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 53 | { |
| 54 | sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset); |
Horia Geantă | 261ea05 | 2016-05-19 18:11:26 +0300 | [diff] [blame^] | 55 | sec4_sg_ptr->len |= cpu_to_caam32(SEC4_SG_LEN_FIN); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 56 | } |
| 57 | |
Herbert Xu | 70c3c8a | 2015-06-08 16:38:24 +0800 | [diff] [blame] | 58 | static inline struct sec4_sg_entry *sg_to_sec4_sg_len( |
| 59 | struct scatterlist *sg, unsigned int total, |
| 60 | struct sec4_sg_entry *sec4_sg_ptr) |
| 61 | { |
| 62 | do { |
| 63 | unsigned int len = min(sg_dma_len(sg), total); |
| 64 | |
| 65 | dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0); |
| 66 | sec4_sg_ptr++; |
| 67 | sg = sg_next(sg); |
| 68 | total -= len; |
| 69 | } while (total); |
| 70 | return sec4_sg_ptr - 1; |
| 71 | } |
| 72 | |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 73 | /* derive number of elements in scatterlist, but return 0 for 1 */ |
LABBE Corentin | 13fb8fd | 2015-09-23 13:55:27 +0200 | [diff] [blame] | 74 | static inline int sg_count(struct scatterlist *sg_list, int nbytes) |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 75 | { |
LABBE Corentin | 13fb8fd | 2015-09-23 13:55:27 +0200 | [diff] [blame] | 76 | int sg_nents = sg_nents_for_len(sg_list, nbytes); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 77 | |
| 78 | if (likely(sg_nents == 1)) |
| 79 | return 0; |
| 80 | |
| 81 | return sg_nents; |
| 82 | } |