v2 changes: * Code cleanup * Changed way of setting DMA descriptors for big-endian This patch fixes compilation sparse warnings like incorrect type in assignment (different base types), cast to restricted __le64, symbol '__UNIQUE_ID_author__COUNTER__' has multiple initializers etc and coccinelle warnings (No need to set .owner here. The core will do it.) This patch is based on slave-dma / for-linus branch. (commit: 9f2fd0dfa594d857fbdaeda523ff7a46f16567f5 [26/28] dmaengine: Add support for APM X-Gene SoC DMA engine driver) Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx> Signed-off-by: Rameshwar Prasad Sahu <rsahu@xxxxxxx> --- drivers/dma/xgene-dma.c | 178 +++++++++++++++++++----------------------------- 1 file changed, 69 insertions(+), 109 deletions(-) diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c index aa61935..d28830e 100755 --- a/drivers/dma/xgene-dma.c +++ b/drivers/dma/xgene-dma.c @@ -127,29 +127,6 @@ #define XGENE_DMA_DESC_FLYBY_POS 4 #define XGENE_DMA_DESC_BUFLEN_POS 48 #define XGENE_DMA_DESC_HOENQ_NUM_POS 48 - -#define XGENE_DMA_DESC_NV_SET(m) \ - (((u64 *)(m))[0] |= XGENE_DMA_DESC_NV_BIT) -#define XGENE_DMA_DESC_IN_SET(m) \ - (((u64 *)(m))[0] |= XGENE_DMA_DESC_IN_BIT) -#define XGENE_DMA_DESC_RTYPE_SET(m, v) \ - (((u64 *)(m))[0] |= ((u64)(v) << XGENE_DMA_DESC_RTYPE_POS)) -#define XGENE_DMA_DESC_BUFADDR_SET(m, v) \ - (((u64 *)(m))[0] |= (v)) -#define XGENE_DMA_DESC_BUFLEN_SET(m, v) \ - (((u64 *)(m))[0] |= ((u64)(v) << XGENE_DMA_DESC_BUFLEN_POS)) -#define XGENE_DMA_DESC_C_SET(m) \ - (((u64 *)(m))[1] |= XGENE_DMA_DESC_C_BIT) -#define XGENE_DMA_DESC_FLYBY_SET(m, v) \ - (((u64 *)(m))[2] |= ((v) << XGENE_DMA_DESC_FLYBY_POS)) -#define XGENE_DMA_DESC_MULTI_SET(m, v, i) \ - (((u64 *)(m))[2] |= ((u64)(v) << (((i) + 1) * 8))) -#define XGENE_DMA_DESC_DR_SET(m) \ - (((u64 *)(m))[2] |= XGENE_DMA_DESC_DR_BIT) -#define XGENE_DMA_DESC_DST_ADDR_SET(m, v) \ - (((u64 *)(m))[3] |= (v)) -#define XGENE_DMA_DESC_H0ENQ_NUM_SET(m, v) \ - (((u64 *)(m))[3] |= ((u64)(v) << XGENE_DMA_DESC_HOENQ_NUM_POS)) #define XGENE_DMA_DESC_ELERR_RD(m) \ (((m) >> XGENE_DMA_DESC_ELERR_POS) & 0x3) #define XGENE_DMA_DESC_LERR_RD(m) \ @@ -158,14 +135,7 @@ (((elerr) << 4) | (lerr)) /* X-Gene DMA descriptor empty s/w signature */ -#define XGENE_DMA_DESC_EMPTY_INDEX 0 #define XGENE_DMA_DESC_EMPTY_SIGNATURE ~0ULL -#define XGENE_DMA_DESC_SET_EMPTY(m) \ - (((u64 *)(m))[XGENE_DMA_DESC_EMPTY_INDEX] = \ - XGENE_DMA_DESC_EMPTY_SIGNATURE) -#define XGENE_DMA_DESC_IS_EMPTY(m) \ - (((u64 *)(m))[XGENE_DMA_DESC_EMPTY_INDEX] == \ - XGENE_DMA_DESC_EMPTY_SIGNATURE) /* X-Gene DMA configurable parameters defines */ #define XGENE_DMA_RING_NUM 512 @@ -238,10 +208,10 @@ dev_err(chan->dev, "%s: " fmt, chan->name, ##arg) struct xgene_dma_desc_hw { - u64 m0; - u64 m1; - u64 m2; - u64 m3; + __le64 m0; + __le64 m1; + __le64 m2; + __le64 m3; }; enum xgene_dma_ring_cfgsize { @@ -388,14 +358,6 @@ static bool is_pq_enabled(struct xgene_dma *pdma) return !(val & XGENE_DMA_PQ_DISABLE_MASK); } -static void xgene_dma_cpu_to_le64(u64 *desc, int count) -{ - int i; - - for (i = 0; i < count; i++) - desc[i] = cpu_to_le64(desc[i]); -} - static u16 xgene_dma_encode_len(u32 len) { return (len < XGENE_DMA_MAX_BYTE_CNT) ? @@ -424,34 +386,52 @@ static u32 xgene_dma_ring_desc_cnt(struct xgene_dma_ring *ring) return XGENE_DMA_RING_DESC_CNT(ring_state); } -static void xgene_dma_set_src_buffer(void *ext8, size_t *len, +static void xgene_dma_set_src_buffer(__le64 *ext8, size_t *len, dma_addr_t *paddr) { size_t nbytes = (*len < XGENE_DMA_MAX_BYTE_CNT) ? *len : XGENE_DMA_MAX_BYTE_CNT; - XGENE_DMA_DESC_BUFADDR_SET(ext8, *paddr); - XGENE_DMA_DESC_BUFLEN_SET(ext8, xgene_dma_encode_len(nbytes)); + *ext8 |= cpu_to_le64(*paddr); + *ext8 |= cpu_to_le64((u64)xgene_dma_encode_len(nbytes) << + XGENE_DMA_DESC_BUFLEN_POS); *len -= nbytes; *paddr += nbytes; } -static void xgene_dma_invalidate_buffer(void *ext8) +static void xgene_dma_invalidate_buffer(__le64 *ext8) { - XGENE_DMA_DESC_BUFLEN_SET(ext8, XGENE_DMA_INVALID_LEN_CODE); + *ext8 |= cpu_to_le64((u64)XGENE_DMA_INVALID_LEN_CODE << + XGENE_DMA_DESC_BUFLEN_POS); } -static void *xgene_dma_lookup_ext8(u64 *desc, int idx) +static __le64 *xgene_dma_lookup_ext8(struct xgene_dma_desc_hw *desc, int idx) { - return (idx % 2) ? (desc + idx - 1) : (desc + idx + 1); + switch (idx) { + case 0: + return &desc->m1; + case 1: + return &desc->m0; + case 2: + return &desc->m3; + case 3: + return &desc->m2; + default: + pr_err("Invalid dma descriptor index\n"); + } + + return NULL; } -static void xgene_dma_init_desc(void *desc, u16 dst_ring_num) +static void xgene_dma_init_desc(struct xgene_dma_desc_hw *desc, + u16 dst_ring_num) { - XGENE_DMA_DESC_C_SET(desc); /* Coherent IO */ - XGENE_DMA_DESC_IN_SET(desc); - XGENE_DMA_DESC_H0ENQ_NUM_SET(desc, dst_ring_num); - XGENE_DMA_DESC_RTYPE_SET(desc, XGENE_DMA_RING_OWNER_DMA); + desc->m0 |= cpu_to_le64(XGENE_DMA_DESC_IN_BIT); + desc->m0 |= cpu_to_le64((u64)XGENE_DMA_RING_OWNER_DMA << + XGENE_DMA_DESC_RTYPE_POS); + desc->m1 |= cpu_to_le64(XGENE_DMA_DESC_C_BIT); + desc->m3 |= cpu_to_le64((u64)dst_ring_num << + XGENE_DMA_DESC_HOENQ_NUM_POS); } static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan, @@ -459,7 +439,7 @@ static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan, dma_addr_t dst, dma_addr_t src, size_t len) { - void *desc1, *desc2; + struct xgene_dma_desc_hw *desc1, *desc2; int i; /* Get 1st descriptor */ @@ -467,23 +447,21 @@ static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan, xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num); /* Set destination address */ - XGENE_DMA_DESC_DR_SET(desc1); - XGENE_DMA_DESC_DST_ADDR_SET(desc1, dst); + desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT); + desc1->m3 |= cpu_to_le64(dst); /* Set 1st source address */ - xgene_dma_set_src_buffer(desc1 + 8, &len, &src); + xgene_dma_set_src_buffer(&desc1->m1, &len, &src); - if (len <= 0) { - desc2 = NULL; - goto skip_additional_src; - } + if (!len) + return; /* * We need to split this source buffer, * and need to use 2nd descriptor */ desc2 = &desc_sw->desc2; - XGENE_DMA_DESC_NV_SET(desc1); + desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT); /* Set 2nd to 5th source address */ for (i = 0; i < 4 && len; i++) @@ -496,12 +474,6 @@ static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan, /* Updated flag that we have prepared 64B descriptor */ desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC; - -skip_additional_src: - /* Hardware stores descriptor in little endian format */ - xgene_dma_cpu_to_le64(desc1, 4); - if (desc2) - xgene_dma_cpu_to_le64(desc2, 4); } static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan, @@ -510,7 +482,7 @@ static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan, u32 src_cnt, size_t *nbytes, const u8 *scf) { - void *desc1, *desc2; + struct xgene_dma_desc_hw *desc1, *desc2; size_t len = *nbytes; int i; @@ -521,28 +493,25 @@ static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan, xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num); /* Set destination address */ - XGENE_DMA_DESC_DR_SET(desc1); - XGENE_DMA_DESC_DST_ADDR_SET(desc1, *dst); + desc1->m2 |= cpu_to_le64(XGENE_DMA_DESC_DR_BIT); + desc1->m3 |= cpu_to_le64(*dst); /* We have multiple source addresses, so need to set NV bit*/ - XGENE_DMA_DESC_NV_SET(desc1); + desc1->m0 |= cpu_to_le64(XGENE_DMA_DESC_NV_BIT); /* Set flyby opcode */ - XGENE_DMA_DESC_FLYBY_SET(desc1, xgene_dma_encode_xor_flyby(src_cnt)); + desc1->m2 |= cpu_to_le64(xgene_dma_encode_xor_flyby(src_cnt) << + XGENE_DMA_DESC_FLYBY_POS); /* Set 1st to 5th source addresses */ for (i = 0; i < src_cnt; i++) { len = *nbytes; - xgene_dma_set_src_buffer((i == 0) ? (desc1 + 8) : + xgene_dma_set_src_buffer((i == 0) ? &desc1->m1 : xgene_dma_lookup_ext8(desc2, i - 1), &len, &src[i]); - XGENE_DMA_DESC_MULTI_SET(desc1, scf[i], i); + desc1->m2 |= cpu_to_le64((scf[i] << ((i + 1) * 8))); } - /* Hardware stores descriptor in little endian format */ - xgene_dma_cpu_to_le64(desc1, 4); - xgene_dma_cpu_to_le64(desc2, 4); - /* Update meta data */ *nbytes = len; *dst += XGENE_DMA_MAX_BYTE_CNT; @@ -738,7 +707,7 @@ static int xgene_chan_xfer_request(struct xgene_dma_ring *ring, * xgene_chan_xfer_ld_pending - push any pending transactions to hw * @chan : X-Gene DMA channel * - * LOCKING: must hold chan->desc_lock + * LOCKING: must hold chan->lock */ static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan) { @@ -808,7 +777,8 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan) desc_hw = &ring->desc_hw[ring->head]; /* Check if this descriptor has been completed */ - if (unlikely(XGENE_DMA_DESC_IS_EMPTY(desc_hw))) + if (unlikely(le64_to_cpu(desc_hw->m0) == + XGENE_DMA_DESC_EMPTY_SIGNATURE)) break; if (++ring->head == ring->slots) @@ -842,7 +812,7 @@ static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan) iowrite32(-1, ring->cmd); /* Mark this hw descriptor as processed */ - XGENE_DMA_DESC_SET_EMPTY(desc_hw); + desc_hw->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE); xgene_dma_run_tx_complete_actions(chan, desc_sw); @@ -889,7 +859,7 @@ static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan) * @chan: X-Gene DMA channel * @list: the list to free * - * LOCKING: must hold chan->desc_lock + * LOCKING: must hold chan->lock */ static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan, struct list_head *list) @@ -900,15 +870,6 @@ static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan, xgene_dma_clean_descriptor(chan, desc); } -static void xgene_dma_free_tx_desc_list(struct xgene_dma_chan *chan, - struct list_head *list) -{ - struct xgene_dma_desc_sw *desc, *_desc; - - list_for_each_entry_safe(desc, _desc, list, node) - xgene_dma_clean_descriptor(chan, desc); -} - static void xgene_dma_free_chan_resources(struct dma_chan *dchan) { struct xgene_dma_chan *chan = to_dma_chan(dchan); @@ -985,7 +946,7 @@ fail: if (!first) return NULL; - xgene_dma_free_tx_desc_list(chan, &first->tx_list); + xgene_dma_free_desc_list(chan, &first->tx_list); return NULL; } @@ -1093,7 +1054,7 @@ fail: if (!first) return NULL; - xgene_dma_free_tx_desc_list(chan, &first->tx_list); + xgene_dma_free_desc_list(chan, &first->tx_list); return NULL; } @@ -1141,7 +1102,7 @@ fail: if (!first) return NULL; - xgene_dma_free_tx_desc_list(chan, &first->tx_list); + xgene_dma_free_desc_list(chan, &first->tx_list); return NULL; } @@ -1218,7 +1179,7 @@ fail: if (!first) return NULL; - xgene_dma_free_tx_desc_list(chan, &first->tx_list); + xgene_dma_free_desc_list(chan, &first->tx_list); return NULL; } @@ -1316,7 +1277,6 @@ static void xgene_dma_setup_ring(struct xgene_dma_ring *ring) { void *ring_cfg = ring->state; u64 addr = ring->desc_paddr; - void *desc; u32 i, val; ring->slots = ring->size / XGENE_DMA_RING_WQ_DESC_SIZE; @@ -1358,8 +1318,10 @@ static void xgene_dma_setup_ring(struct xgene_dma_ring *ring) /* Set empty signature to DMA Rx ring descriptors */ for (i = 0; i < ring->slots; i++) { + struct xgene_dma_desc_hw *desc; + desc = &ring->desc_hw[i]; - XGENE_DMA_DESC_SET_EMPTY(desc); + desc->m0 = cpu_to_le64(XGENE_DMA_DESC_EMPTY_SIGNATURE); } /* Enable DMA Rx ring interrupt */ @@ -1895,9 +1857,9 @@ static int xgene_dma_get_resources(struct platform_device *pdev, pdma->csr_dma = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (IS_ERR(pdma->csr_dma)) { + if (!pdma->csr_dma) { dev_err(&pdev->dev, "Failed to ioremap csr region"); - return PTR_ERR(pdma->csr_dma); + return -ENOMEM; } /* Get DMA ring csr region */ @@ -1909,9 +1871,9 @@ static int xgene_dma_get_resources(struct platform_device *pdev, pdma->csr_ring = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (IS_ERR(pdma->csr_ring)) { + if (!pdma->csr_ring) { dev_err(&pdev->dev, "Failed to ioremap ring csr region"); - return PTR_ERR(pdma->csr_ring); + return -ENOMEM; } /* Get DMA ring cmd csr region */ @@ -1923,9 +1885,9 @@ static int xgene_dma_get_resources(struct platform_device *pdev, pdma->csr_ring_cmd = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (IS_ERR(pdma->csr_ring_cmd)) { + if (!pdma->csr_ring_cmd) { dev_err(&pdev->dev, "Failed to ioremap ring cmd csr region"); - return PTR_ERR(pdma->csr_ring_cmd); + return -ENOMEM; } /* Get efuse csr region */ @@ -1937,9 +1899,9 @@ static int xgene_dma_get_resources(struct platform_device *pdev, pdma->csr_efuse = devm_ioremap(&pdev->dev, res->start, resource_size(res)); - if (IS_ERR(pdma->csr_efuse)) { + if (!pdma->csr_efuse) { dev_err(&pdev->dev, "Failed to ioremap efuse csr region"); - return PTR_ERR(pdma->csr_efuse); + return -ENOMEM; } /* Get DMA error interrupt */ @@ -2076,7 +2038,6 @@ static struct platform_driver xgene_dma_driver = { .remove = xgene_dma_remove, .driver = { .name = "X-Gene-DMA", - .owner = THIS_MODULE, .of_match_table = xgene_dma_of_match_ptr, }, }; @@ -2085,6 +2046,5 @@ module_platform_driver(xgene_dma_driver); MODULE_DESCRIPTION("APM X-Gene SoC DMA driver"); MODULE_AUTHOR("Rameshwar Prasad Sahu <rsahu@xxxxxxx>"); -MODULE_AUTHOR("Loc Ho <lho@xxxxxxx>"); MODULE_LICENSE("GPL"); MODULE_VERSION("1.0"); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html