From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Tue, 28 Feb 2017 18:56:04 +0100 Subject: [PATCH 5/9] dmaengine: sun6i: support V3s SoC variant In-Reply-To: <1426971488192481@web6g.yandex.ru> References: <20170225123029.55939-1-icenowy@aosc.xyz> <20170225123029.55939-5-icenowy@aosc.xyz> <20170227075021.e7e43o54s23jzfto@lukather> <1426971488192481@web6g.yandex.ru> Message-ID: <20170228175604.kdlmjjcncfljnbfp@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Feb 27, 2017 at 06:48:01PM +0800, Icenowy Zheng wrote: > > > 27.02.2017, 15:50, "Maxime Ripard" : > > On Sat, Feb 25, 2017 at 08:30:25PM +0800, Icenowy Zheng wrote: > >> ?Allwinner V3s has a DMA engine similar to the ones from A31, but with > >> ?fewer channels and DRQs. > >> > >> ?Add support for it. > >> > >> ?As it also needs the special gate bit, make the gate bit generic. > > > > That should be part of a separate patch. > > OK. > > > > >> ?According to BSP source code, SUN8IW6 (A83T) also needs the bit, so it > >> ?have also been specified gate_needed property. > >> > >> ?Signed-off-by: Icenowy Zheng > >> ?--- > >> ??Documentation/devicetree/bindings/dma/sun6i-dma.txt | 1 + > >> ??drivers/dma/sun6i-dma.c | 17 ++++++++++++++--- > >> ??2 files changed, 15 insertions(+), 3 deletions(-) > >> > >> ?diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > >> ?index 6b267045f522..98fbe1a5c6dd 100644 > >> ?--- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt > >> ?+++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt > >> ?@@ -9,6 +9,7 @@ Required properties: > >> ????????????????????"allwinner,sun8i-a23-dma" > >> ????????????????????"allwinner,sun8i-a83t-dma" > >> ????????????????????"allwinner,sun8i-h3-dma" > >> ?+ "allwinner,sun8i-v3s-dma" > >> ??- reg: Should contain the registers base address and length > >> ??- interrupts: Should contain a reference to the interrupt used by this device > >> ??- clocks: Should contain a reference to the parent AHB clock > >> ?diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c > >> ?index a2358780ab2c..1f38424c1b14 100644 > >> ?--- a/drivers/dma/sun6i-dma.c > >> ?+++ b/drivers/dma/sun6i-dma.c > >> ?@@ -101,6 +101,7 @@ struct sun6i_dma_config { > >> ??????????u32 nr_max_channels; > >> ??????????u32 nr_max_requests; > >> ??????????u32 nr_max_vchans; > >> ?+ bool gate_needed; > >> ??}; > >> > >> ??/* > >> ?@@ -1009,12 +1010,14 @@ static struct sun6i_dma_config sun8i_a23_dma_cfg = { > >> ??????????.nr_max_channels = 8, > >> ??????????.nr_max_requests = 24, > >> ??????????.nr_max_vchans = 37, > >> ?+ .gate_needed = true, > >> ??}; > >> > >> ??static struct sun6i_dma_config sun8i_a83t_dma_cfg = { > >> ??????????.nr_max_channels = 8, > >> ??????????.nr_max_requests = 28, > >> ??????????.nr_max_vchans = 39, > >> ?+ .gate_needed = true, > >> ??}; > >> > >> ??/* > >> ?@@ -1028,11 +1031,19 @@ static struct sun6i_dma_config sun8i_h3_dma_cfg = { > >> ??????????.nr_max_vchans = 34, > >> ??}; > >> > >> ?+static struct sun6i_dma_config sun8i_v3s_dma_cfg = { > >> ?+ .nr_max_channels = 8, > >> ?+ .nr_max_requests = 23, > >> ?+ .nr_max_vchans = 24, > > > > This one is suspicious. There's just a single endpoint that can be > > used in both directions? > > nr_max_vchans is the endpoint number. nr_max_requests is the > maximum DRQ number, for V3s, according to the datasheet, it's > 23: SPI0_{R,T}X. There's not a lot of endpoints indeed, but you need 28 vchans (2 * 14). Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: not available URL: