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Diffstat (limited to 'drivers/dma/amba-pl08x.c')
-rw-r--r--drivers/dma/amba-pl08x.c141
1 files changed, 17 insertions, 124 deletions
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 6bba32e..be9a1c7 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -149,14 +149,6 @@ struct pl08x_driver_data {
* PL08X specific defines
*/
-/*
- * Memory boundaries: the manual for PL08x says that the controller
- * cannot read past a 1KiB boundary, so these defines are used to
- * create transfer LLIs that do not cross such boundaries.
- */
-#define PL08X_BOUNDARY_SHIFT (10) /* 1KB 0x400 */
-#define PL08X_BOUNDARY_SIZE (1 << PL08X_BOUNDARY_SHIFT)
-
/* Size (bytes) of each LLI buffer allocated for one transfer */
# define PL08X_LLI_TSFR_SIZE 0x2000
@@ -568,18 +560,6 @@ static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd,
}
/*
- * Return number of bytes to fill to boundary, or len.
- * This calculation works for any value of addr.
- */
-static inline size_t pl08x_pre_boundary(u32 addr, size_t len)
-{
- size_t boundary_len = PL08X_BOUNDARY_SIZE -
- (addr & (PL08X_BOUNDARY_SIZE - 1));
-
- return min(boundary_len, len);
-}
-
-/*
* This fills in the table of LLIs for the transfer descriptor
* Note that we assume we never have to change the burst sizes
* Return 0 for error
@@ -685,118 +665,30 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
* width left
*/
while (bd.remainder > (mbus->buswidth - 1)) {
- size_t lli_len, target_len, tsize, odd_bytes;
+ size_t lli_len, tsize;
/*
* If enough left try to send max possible,
* otherwise try to send the remainder
*/
- target_len = min(bd.remainder, max_bytes_per_lli);
-
+ lli_len = min(bd.remainder, max_bytes_per_lli);
/*
- * Set bus lengths for incrementing buses to the
- * number of bytes which fill to next memory boundary,
- * limiting on the target length calculated above.
+ * Check against minimum bus alignment: Calculate actual
+ * transfer size in relation to bus width and get a
+ * maximum remainder of the smallest bus width - 1
*/
- if (cctl & PL080_CONTROL_SRC_INCR)
- bd.srcbus.fill_bytes =
- pl08x_pre_boundary(bd.srcbus.addr,
- target_len);
- else
- bd.srcbus.fill_bytes = target_len;
-
- if (cctl & PL080_CONTROL_DST_INCR)
- bd.dstbus.fill_bytes =
- pl08x_pre_boundary(bd.dstbus.addr,
- target_len);
- else
- bd.dstbus.fill_bytes = target_len;
-
- /* Find the nearest */
- lli_len = min(bd.srcbus.fill_bytes,
- bd.dstbus.fill_bytes);
-
- BUG_ON(lli_len > bd.remainder);
-
- if (lli_len <= 0) {
- dev_err(&pl08x->adev->dev,
- "%s lli_len is %zu, <= 0\n",
- __func__, lli_len);
- return 0;
- }
-
- if (lli_len == target_len) {
- /*
- * Can send what we wanted.
- * Maintain alignment
- */
- lli_len = (lli_len/mbus->buswidth) *
- mbus->buswidth;
- odd_bytes = 0;
- } else {
- /*
- * So now we know how many bytes to transfer
- * to get to the nearest boundary. The next
- * LLI will past the boundary. However, we
- * may be working to a boundary on the slave
- * bus. We need to ensure the master stays
- * aligned, and that we are working in
- * multiples of the bus widths.
- */
- odd_bytes = lli_len % mbus->buswidth;
- lli_len -= odd_bytes;
-
- }
-
- if (lli_len) {
- /*
- * Check against minimum bus alignment:
- * Calculate actual transfer size in relation
- * to bus width an get a maximum remainder of
- * the smallest bus width - 1
- */
- /* FIXME: use round_down()? */
- tsize = lli_len / min(mbus->buswidth,
- sbus->buswidth);
- lli_len = tsize * min(mbus->buswidth,
- sbus->buswidth);
-
- if (target_len != lli_len) {
- dev_vdbg(&pl08x->adev->dev,
- "%s can't send what we want. Desired 0x%08zx, lli of 0x%08zx bytes in txd of 0x%08zx\n",
- __func__, target_len, lli_len, txd->len);
- }
-
- cctl = pl08x_cctl_bits(cctl,
- bd.srcbus.buswidth,
- bd.dstbus.buswidth,
- tsize);
-
- dev_vdbg(&pl08x->adev->dev,
- "%s fill lli with single lli chunk of size 0x%08zx (remainder 0x%08zx)\n",
- __func__, lli_len, bd.remainder);
- pl08x_fill_lli_for_desc(&bd, num_llis++,
- lli_len, cctl);
- total_bytes += lli_len;
- }
+ tsize = lli_len / min(mbus->buswidth, sbus->buswidth);
+ lli_len = tsize * min(mbus->buswidth, sbus->buswidth);
- if (odd_bytes) {
- /*
- * Creep past the boundary, maintaining
- * master alignment
- */
- int j;
- for (j = 0; (j < mbus->buswidth)
- && (bd.remainder); j++) {
- cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
- dev_vdbg(&pl08x->adev->dev,
- "%s align with boundary, single byte (remain 0x%08zx)\n",
- __func__, bd.remainder);
- pl08x_fill_lli_for_desc(&bd,
- num_llis++, 1, cctl);
- total_bytes++;
- }
- }
+ dev_vdbg(&pl08x->adev->dev,
+ "%s fill lli with single lli chunk of "
+ "size 0x%08zx (remainder 0x%08zx)\n",
+ __func__, lli_len, bd.remainder);
+
+ cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth,
+ bd.dstbus.buswidth, tsize);
+ pl08x_fill_lli_for_desc(&bd, num_llis++, lli_len, cctl);
+ total_bytes += lli_len;
}
/*
@@ -811,6 +703,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
total_bytes++;
}
}
+
if (total_bytes != txd->len) {
dev_err(&pl08x->adev->dev,
"%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
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