dmaengine: remove DMA_SG as it is dead code in kernel
There are no in kernel consumers for DMA_SG op. Removing operation,
dead code, and test code in dmatest.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: Kedareswara rao Appana <appana.durga.rao@xilinx.com>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 1baf340..fbab271 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1203,138 +1203,6 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
}
/**
- * atc_prep_dma_sg - prepare memory to memory scather-gather operation
- * @chan: the channel to prepare operation on
- * @dst_sg: destination scatterlist
- * @dst_nents: number of destination scatterlist entries
- * @src_sg: source scatterlist
- * @src_nents: number of source scatterlist entries
- * @flags: tx descriptor status flags
- */
-static struct dma_async_tx_descriptor *
-atc_prep_dma_sg(struct dma_chan *chan,
- struct scatterlist *dst_sg, unsigned int dst_nents,
- struct scatterlist *src_sg, unsigned int src_nents,
- unsigned long flags)
-{
- struct at_dma_chan *atchan = to_at_dma_chan(chan);
- struct at_desc *desc = NULL;
- struct at_desc *first = NULL;
- struct at_desc *prev = NULL;
- unsigned int src_width;
- unsigned int dst_width;
- size_t xfer_count;
- u32 ctrla;
- u32 ctrlb;
- size_t dst_len = 0, src_len = 0;
- dma_addr_t dst = 0, src = 0;
- size_t len = 0, total_len = 0;
-
- if (unlikely(dst_nents == 0 || src_nents == 0))
- return NULL;
-
- if (unlikely(dst_sg == NULL || src_sg == NULL))
- return NULL;
-
- ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN
- | ATC_SRC_ADDR_MODE_INCR
- | ATC_DST_ADDR_MODE_INCR
- | ATC_FC_MEM2MEM;
-
- /*
- * loop until there is either no more source or no more destination
- * scatterlist entry
- */
- while (true) {
-
- /* prepare the next transfer */
- if (dst_len == 0) {
-
- /* no more destination scatterlist entries */
- if (!dst_sg || !dst_nents)
- break;
-
- dst = sg_dma_address(dst_sg);
- dst_len = sg_dma_len(dst_sg);
-
- dst_sg = sg_next(dst_sg);
- dst_nents--;
- }
-
- if (src_len == 0) {
-
- /* no more source scatterlist entries */
- if (!src_sg || !src_nents)
- break;
-
- src = sg_dma_address(src_sg);
- src_len = sg_dma_len(src_sg);
-
- src_sg = sg_next(src_sg);
- src_nents--;
- }
-
- len = min_t(size_t, src_len, dst_len);
- if (len == 0)
- continue;
-
- /* take care for the alignment */
- src_width = dst_width = atc_get_xfer_width(src, dst, len);
-
- ctrla = ATC_SRC_WIDTH(src_width) |
- ATC_DST_WIDTH(dst_width);
-
- /*
- * The number of transfers to set up refer to the source width
- * that depends on the alignment.
- */
- xfer_count = len >> src_width;
- if (xfer_count > ATC_BTSIZE_MAX) {
- xfer_count = ATC_BTSIZE_MAX;
- len = ATC_BTSIZE_MAX << src_width;
- }
-
- /* create the transfer */
- desc = atc_desc_get(atchan);
- if (!desc)
- goto err_desc_get;
-
- desc->lli.saddr = src;
- desc->lli.daddr = dst;
- desc->lli.ctrla = ctrla | xfer_count;
- desc->lli.ctrlb = ctrlb;
-
- desc->txd.cookie = 0;
- desc->len = len;
-
- atc_desc_chain(&first, &prev, desc);
-
- /* update the lengths and addresses for the next loop cycle */
- dst_len -= len;
- src_len -= len;
- dst += len;
- src += len;
-
- total_len += len;
- }
-
- /* First descriptor of the chain embedds additional information */
- first->txd.cookie = -EBUSY;
- first->total_len = total_len;
-
- /* set end-of-link to the last link descriptor of list*/
- set_desc_eol(desc);
-
- first->txd.flags = flags; /* client is in control of this ack */
-
- return &first->txd;
-
-err_desc_get:
- atc_desc_put(atchan, first);
- return NULL;
-}
-
-/**
* atc_dma_cyclic_check_values
* Check for too big/unaligned periods and unaligned DMA buffer
*/
@@ -1933,14 +1801,12 @@ static int __init at_dma_probe(struct platform_device *pdev)
/* setup platform data for each SoC */
dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask);
- dma_cap_set(DMA_SG, at91sam9rl_config.cap_mask);
dma_cap_set(DMA_INTERLEAVE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMCPY, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMSET, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_MEMSET_SG, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_PRIVATE, at91sam9g45_config.cap_mask);
dma_cap_set(DMA_SLAVE, at91sam9g45_config.cap_mask);
- dma_cap_set(DMA_SG, at91sam9g45_config.cap_mask);
/* get DMA parameters from controller type */
plat_dat = at_dma_get_driver_data(pdev);
@@ -2078,16 +1944,12 @@ static int __init at_dma_probe(struct platform_device *pdev)
atdma->dma_common.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
}
- if (dma_has_cap(DMA_SG, atdma->dma_common.cap_mask))
- atdma->dma_common.device_prep_dma_sg = atc_prep_dma_sg;
-
dma_writel(atdma, EN, AT_DMA_ENABLE);
- dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s%s%s), %d channels\n",
+ dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s%s), %d channels\n",
dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask) ? "cpy " : "",
dma_has_cap(DMA_MEMSET, atdma->dma_common.cap_mask) ? "set " : "",
dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask) ? "slave " : "",
- dma_has_cap(DMA_SG, atdma->dma_common.cap_mask) ? "sg-cpy " : "",
plat_dat->nr_channels);
dma_async_device_register(&atdma->dma_common);