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 | |
| 8 | struct sec4_sg_entry; |
| 9 | |
| 10 | /* |
| 11 | * convert single dma address to h/w link table format |
| 12 | */ |
| 13 | static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr, |
| 14 | dma_addr_t dma, u32 len, u32 offset) |
| 15 | { |
| 16 | sec4_sg_ptr->ptr = dma; |
| 17 | sec4_sg_ptr->len = len; |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 18 | sec4_sg_ptr->buf_pool_id = 0; |
| 19 | sec4_sg_ptr->offset = offset; |
| 20 | #ifdef DEBUG |
| 21 | print_hex_dump(KERN_ERR, "sec4_sg_ptr@: ", |
| 22 | DUMP_PREFIX_ADDRESS, 16, 4, sec4_sg_ptr, |
| 23 | sizeof(struct sec4_sg_entry), 1); |
| 24 | #endif |
| 25 | } |
| 26 | |
| 27 | /* |
| 28 | * convert scatterlist to h/w link table format |
| 29 | * but does not have final bit; instead, returns last entry |
| 30 | */ |
| 31 | static inline struct sec4_sg_entry * |
| 32 | sg_to_sec4_sg(struct scatterlist *sg, int sg_count, |
| 33 | struct sec4_sg_entry *sec4_sg_ptr, u32 offset) |
| 34 | { |
| 35 | while (sg_count) { |
| 36 | dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), |
| 37 | sg_dma_len(sg), offset); |
| 38 | sec4_sg_ptr++; |
Cristian Stoica | 5be4d4c | 2015-01-20 10:06:16 +0200 | [diff] [blame] | 39 | sg = sg_next(sg); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 40 | sg_count--; |
| 41 | } |
| 42 | return sec4_sg_ptr - 1; |
| 43 | } |
| 44 | |
| 45 | /* |
| 46 | * convert scatterlist to h/w link table format |
| 47 | * scatterlist must have been previously dma mapped |
| 48 | */ |
| 49 | static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int sg_count, |
| 50 | struct sec4_sg_entry *sec4_sg_ptr, |
| 51 | u32 offset) |
| 52 | { |
| 53 | sec4_sg_ptr = sg_to_sec4_sg(sg, sg_count, sec4_sg_ptr, offset); |
| 54 | sec4_sg_ptr->len |= SEC4_SG_LEN_FIN; |
| 55 | } |
| 56 | |
Herbert Xu | 70c3c8a | 2015-06-08 16:38:24 +0800 | [diff] [blame] | 57 | static inline struct sec4_sg_entry *sg_to_sec4_sg_len( |
| 58 | struct scatterlist *sg, unsigned int total, |
| 59 | struct sec4_sg_entry *sec4_sg_ptr) |
| 60 | { |
| 61 | do { |
| 62 | unsigned int len = min(sg_dma_len(sg), total); |
| 63 | |
| 64 | dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), len, 0); |
| 65 | sec4_sg_ptr++; |
| 66 | sg = sg_next(sg); |
| 67 | total -= len; |
| 68 | } while (total); |
| 69 | return sec4_sg_ptr - 1; |
| 70 | } |
| 71 | |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 72 | /* count number of elements in scatterlist */ |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 73 | static inline int __sg_count(struct scatterlist *sg_list, int nbytes, |
| 74 | bool *chained) |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 75 | { |
| 76 | struct scatterlist *sg = sg_list; |
| 77 | int sg_nents = 0; |
| 78 | |
| 79 | while (nbytes > 0) { |
| 80 | sg_nents++; |
| 81 | nbytes -= sg->length; |
| 82 | if (!sg_is_last(sg) && (sg + 1)->length == 0) |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 83 | *chained = true; |
Cristian Stoica | 5be4d4c | 2015-01-20 10:06:16 +0200 | [diff] [blame] | 84 | sg = sg_next(sg); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | return sg_nents; |
| 88 | } |
| 89 | |
| 90 | /* derive number of elements in scatterlist, but return 0 for 1 */ |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 91 | static inline int sg_count(struct scatterlist *sg_list, int nbytes, |
| 92 | bool *chained) |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 93 | { |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 94 | int sg_nents = __sg_count(sg_list, nbytes, chained); |
Yuan Kang | a299c83 | 2012-06-22 19:48:46 -0500 | [diff] [blame] | 95 | |
| 96 | if (likely(sg_nents == 1)) |
| 97 | return 0; |
| 98 | |
| 99 | return sg_nents; |
| 100 | } |
Yuan Kang | 045e367 | 2012-06-22 19:48:47 -0500 | [diff] [blame] | 101 | |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 102 | static inline void dma_unmap_sg_chained( |
| 103 | struct device *dev, struct scatterlist *sg, unsigned int nents, |
| 104 | enum dma_data_direction dir, bool chained) |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 105 | { |
| 106 | if (unlikely(chained)) { |
| 107 | int i; |
Victoria Milhoan | ec02730 | 2015-08-05 11:28:41 -0700 | [diff] [blame] | 108 | struct scatterlist *tsg = sg; |
| 109 | |
| 110 | /* |
| 111 | * Use a local copy of the sg pointer to avoid moving the |
| 112 | * head of the list pointed to by sg as we walk the list. |
| 113 | */ |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 114 | for (i = 0; i < nents; i++) { |
Victoria Milhoan | ec02730 | 2015-08-05 11:28:41 -0700 | [diff] [blame] | 115 | dma_unmap_sg(dev, tsg, 1, dir); |
| 116 | tsg = sg_next(tsg); |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 117 | } |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 118 | } else if (nents) { |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 119 | dma_unmap_sg(dev, sg, nents, dir); |
| 120 | } |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | static inline int dma_map_sg_chained( |
| 124 | struct device *dev, struct scatterlist *sg, unsigned int nents, |
| 125 | enum dma_data_direction dir, bool chained) |
| 126 | { |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 127 | if (unlikely(chained)) { |
| 128 | int i; |
Victoria Milhoan | ec02730 | 2015-08-05 11:28:41 -0700 | [diff] [blame] | 129 | struct scatterlist *tsg = sg; |
| 130 | |
| 131 | /* |
| 132 | * Use a local copy of the sg pointer to avoid moving the |
| 133 | * head of the list pointed to by sg as we walk the list. |
| 134 | */ |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 135 | for (i = 0; i < nents; i++) { |
Victoria Milhoan | ec02730 | 2015-08-05 11:28:41 -0700 | [diff] [blame] | 136 | if (!dma_map_sg(dev, tsg, 1, dir)) { |
| 137 | dma_unmap_sg_chained(dev, sg, i, dir, |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 138 | chained); |
| 139 | nents = 0; |
| 140 | break; |
| 141 | } |
| 142 | |
Victoria Milhoan | ec02730 | 2015-08-05 11:28:41 -0700 | [diff] [blame] | 143 | tsg = sg_next(tsg); |
Herbert Xu | 6c94711 | 2015-06-16 13:54:22 +0800 | [diff] [blame] | 144 | } |
| 145 | } else |
| 146 | nents = dma_map_sg(dev, sg, nents, dir); |
| 147 | |
Yuan Kang | 643b39b | 2012-06-22 19:48:49 -0500 | [diff] [blame] | 148 | return nents; |
| 149 | } |