From: Viresh Kumar <viresh.kumar@st.com> To: <linus.walleij@linaro.org> Cc: <vinod.koul@intel.com>, <dan.j.williams@intel.com>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux@arm.linux.org.uk>, <armando.visconti@st.com>, <shiraz.hashim@st.com>, <vipin.kumar@st.com>, <rajeev-dlh.kumar@st.com>, <deepak.sikri@st.com>, <vipulkumar.samar@st.com>, <amit.virdi@st.com>, <viresh.kumar@st.com>, <pratyush.anand@st.com>, <bhupesh.sharma@st.com>, <viresh.linux@gmail.com> Subject: [PATCH V2 12/20] dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary() Date: Mon, 1 Aug 2011 15:07:22 +0530 [thread overview] Message-ID: <009fd246ab649024db5b7d81b3313fd8b43442f0.1312190881.git.viresh.kumar@st.com> (raw) In-Reply-To: <cover.1312190881.git.viresh.kumar@st.com> Pl080 Manual says: "Bursts do not cross the 1KB address boundary" We can program the controller to cross 1 KB boundary on a burst and controller can take care of this boundary condition by itself. Following is the discussion with ARM Technical Support Guys (David): [Viresh] Manual says: "Bursts do not cross the 1KB address boundary" What does that actually mean? As, Maximum size transferable with a single LLI is 4095 * 4 =16380 ~ 16KB. So, if we don't have src/dest address aligned to burst size, we can't use this big of an LLI. [David] There is a difference between bursts describing the total data transferred by the DMA controller and AHB bursts. Bursts described by the programmable parameters in the PL080 have no direct connection with the bursts that are seen on the AHB bus. The statement that "Bursts do not cross the 1KB address boundary" in the TRM is referring to AHB bursts, where this limitation is a requirement of the AHB spec. You can still issue bursts within the PL080 that are in excess of 1KB. The PL080 will make sure that its bursts are broken down into legal AHB bursts which will be formatted to ensure that no AHB burst crosses a 1KB boundary. Based on above discussion, this patch removes all code related to 1 KB boundary as we are not required to handle this in driver. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/dma/amba-pl08x.c | 141 +++++-------------------------------------- include/linux/amba/pl08x.h | 2 - 2 files changed, 17 insertions(+), 126 deletions(-) diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 1b7a60f..e00a9b5 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 @@ -565,18 +557,6 @@ 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 @@ -682,118 +662,30 @@ 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; } /* @@ -808,6 +700,7 @@ 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", diff --git a/include/linux/amba/pl08x.h b/include/linux/amba/pl08x.h index cd8f629..ecd17f5 100644 --- a/include/linux/amba/pl08x.h +++ b/include/linux/amba/pl08x.h @@ -77,13 +77,11 @@ struct pl08x_channel_data { * @addr: current address * @maxwidth: the maximum width of a transfer on this bus * @buswidth: the width of this bus in bytes: 1, 2 or 4 - * @fill_bytes: bytes required to fill to the next bus memory boundary */ struct pl08x_bus_data { dma_addr_t addr; u8 maxwidth; u8 buswidth; - size_t fill_bytes; }; /** -- 1.7.2.2
WARNING: multiple messages have this Message-ID (diff)
From: viresh.kumar@st.com (Viresh Kumar) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH V2 12/20] dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary() Date: Mon, 1 Aug 2011 15:07:22 +0530 [thread overview] Message-ID: <009fd246ab649024db5b7d81b3313fd8b43442f0.1312190881.git.viresh.kumar@st.com> (raw) In-Reply-To: <cover.1312190881.git.viresh.kumar@st.com> Pl080 Manual says: "Bursts do not cross the 1KB address boundary" We can program the controller to cross 1 KB boundary on a burst and controller can take care of this boundary condition by itself. Following is the discussion with ARM Technical Support Guys (David): [Viresh] Manual says: "Bursts do not cross the 1KB address boundary" What does that actually mean? As, Maximum size transferable with a single LLI is 4095 * 4 =16380 ~ 16KB. So, if we don't have src/dest address aligned to burst size, we can't use this big of an LLI. [David] There is a difference between bursts describing the total data transferred by the DMA controller and AHB bursts. Bursts described by the programmable parameters in the PL080 have no direct connection with the bursts that are seen on the AHB bus. The statement that "Bursts do not cross the 1KB address boundary" in the TRM is referring to AHB bursts, where this limitation is a requirement of the AHB spec. You can still issue bursts within the PL080 that are in excess of 1KB. The PL080 will make sure that its bursts are broken down into legal AHB bursts which will be formatted to ensure that no AHB burst crosses a 1KB boundary. Based on above discussion, this patch removes all code related to 1 KB boundary as we are not required to handle this in driver. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/dma/amba-pl08x.c | 141 +++++-------------------------------------- include/linux/amba/pl08x.h | 2 - 2 files changed, 17 insertions(+), 126 deletions(-) diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index 1b7a60f..e00a9b5 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 @@ -565,18 +557,6 @@ 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 @@ -682,118 +662,30 @@ 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; } /* @@ -808,6 +700,7 @@ 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", diff --git a/include/linux/amba/pl08x.h b/include/linux/amba/pl08x.h index cd8f629..ecd17f5 100644 --- a/include/linux/amba/pl08x.h +++ b/include/linux/amba/pl08x.h @@ -77,13 +77,11 @@ struct pl08x_channel_data { * @addr: current address * @maxwidth: the maximum width of a transfer on this bus * @buswidth: the width of this bus in bytes: 1, 2 or 4 - * @fill_bytes: bytes required to fill to the next bus memory boundary */ struct pl08x_bus_data { dma_addr_t addr; u8 maxwidth; u8 buswidth; - size_t fill_bytes; }; /** -- 1.7.2.2
next prev parent reply other threads:[~2011-08-01 9:41 UTC|newest] Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-08-01 9:37 [PATCH V2 00/20] dmaengine/amba-pl08x updates Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 01/20] ARM: asm/pl080.h: Protect against multiple inclusion of header file Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 02/20] dmaengine/amba-pl08x: Resolve formatting issues Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 03/20] dmaengine/amba-pl08x: Rearrange inclusion of header files in ascending order Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:52 ` Sergei Shtylyov 2011-08-01 9:52 ` Sergei Shtylyov 2011-08-01 10:34 ` viresh kumar 2011-08-01 10:34 ` viresh kumar 2011-08-01 9:37 ` [PATCH V2 04/20] dmaengine/amba-pl08x: pass (*ptr) to sizeof() instead of (struct xyz) Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 05/20] dmaengine/amba-pl08x: Complete doc comment for struct pl08x_txd Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 06/20] dmaengine/amba-pl08x: Remove redundant comment and rewrite original Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 07/20] dmaengine/amba-pl08x: Changing few prints to dev_dbg from dev_info Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-04 8:28 ` Koul, Vinod 2011-08-04 8:28 ` Koul, Vinod 2011-08-04 9:25 ` viresh kumar 2011-08-04 9:25 ` viresh kumar 2011-08-04 8:53 ` Koul, Vinod 2011-08-04 8:53 ` Koul, Vinod 2011-08-01 9:37 ` [PATCH V2 08/20] dmaengine/amba-pl08x: support runtime PM Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 10:26 ` Russell King - ARM Linux 2011-08-01 10:26 ` Russell King - ARM Linux 2011-08-01 11:55 ` viresh kumar 2011-08-01 11:55 ` viresh kumar 2011-08-03 12:39 ` Russell King - ARM Linux 2011-08-03 12:39 ` Russell King - ARM Linux 2011-08-04 5:19 ` viresh kumar 2011-08-04 5:19 ` viresh kumar 2011-08-04 5:36 ` Koul, Vinod 2011-08-04 5:36 ` Koul, Vinod 2011-08-04 6:31 ` viresh kumar 2011-08-04 6:31 ` viresh kumar 2011-08-04 7:28 ` Koul, Vinod 2011-08-04 7:28 ` Koul, Vinod 2011-08-04 8:42 ` viresh kumar 2011-08-04 8:42 ` viresh kumar 2011-08-01 9:37 ` [PATCH V2 09/20] dmaengine/amba-pl08x: Simplify pl08x_ensure_on() Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 10/20] dmaengine/amba-pl08x: No need to check "ch->signal < 0" Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 11/20] dmaengine/amba-pl08x: Schedule tasklet in case of error interrupt Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar [this message] 2011-08-01 9:37 ` [PATCH V2 12/20] dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary() Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 13/20] dmaengine/amba-pl08x: max_bytes_per_lli is TRANSFER_SIZE * src_width (not MIN(width)) Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 14/20] dmaengine/amba-pl08x: Add prep_single_byte_llis() routine Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 15/20] dmaengine/amba-pl08x: Align lli_len to max(src.width, dst.width) Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 16/20] dmaengine/amba-pl08x: Choose peripheral bus as master bus Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 17/20] dmaengine/amba-pl08x: Pass flow controller information with slave channel data Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 18/20] dmaengine/amba-pl08x: Add support for sg len greater than one for slave transfers Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-04 10:27 ` viresh kumar 2011-08-04 10:27 ` viresh kumar 2011-08-01 9:37 ` [PATCH V2 19/20] dmaengine/amba-pl08x: Check txd->llis_va before freeing dma_pool Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 9:37 ` [PATCH V2 20/20] dmaengine/amba-pl08x: Call pl08x_free_txd() instead of calling kfree() directly Viresh Kumar 2011-08-01 9:37 ` Viresh Kumar 2011-08-01 11:56 ` [PATCH V3 08/20] dmaengine/amba-pl08x: support runtime PM Viresh Kumar 2011-08-01 11:56 ` Viresh Kumar 2011-08-04 8:52 ` Koul, Vinod 2011-08-04 8:52 ` Koul, Vinod 2011-08-04 9:41 ` viresh kumar 2011-08-04 9:41 ` viresh kumar
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