All of lore.kernel.org
 help / color / mirror / Atom feed
From: Alexandre Torgue <alexandre.torgue-qxv4g6HH51o@public.gmane.org>
To: Maxime Coquelin
	<mcoquelin.stm32-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	arnd-r2nGTMty4D4@public.gmane.org,
	robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	mark.rutland-5wv7dgnIgG8@public.gmane.org,
	linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org,
	patrice.chotard-qxv4g6HH51o@public.gmane.org,
	lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH 1/3] ARM: dts: stm32: add DMA memory pool on MCU which embed a cortex-M7
Date: Tue, 12 Dec 2017 19:02:24 +0100	[thread overview]
Message-ID: <1513101746-18030-2-git-send-email-alexandre.torgue@st.com> (raw)
In-Reply-To: <1513101746-18030-1-git-send-email-alexandre.torgue-qxv4g6HH51o@public.gmane.org>

On cortex-M7 MCU, DMA have to use a non cache-able memory area. For this
reason a dedicated memory pool is created for DMA.
This patch creates a DMA memory pool of 1MB of each STM32 MCU which
embeds a cortex-M7 expect stm32f746-disco. Indeed, as stm32f746-disco has
only a 8MB SDRAM and it's tricky to reduce memory used by Kernel.

Signed-off-by: Alexandre Torgue <alexandre.torgue-qxv4g6HH51o@public.gmane.org>

diff --git a/arch/arm/boot/dts/stm32746g-eval.dts b/arch/arm/boot/dts/stm32746g-eval.dts
index 2d4e717..3f52a7b 100644
--- a/arch/arm/boot/dts/stm32746g-eval.dts
+++ b/arch/arm/boot/dts/stm32746g-eval.dts
@@ -57,6 +57,19 @@
 		reg = <0xc0000000 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc1f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
diff --git a/arch/arm/boot/dts/stm32f769-disco.dts b/arch/arm/boot/dts/stm32f769-disco.dts
index 4463ca1..08699a2 100644
--- a/arch/arm/boot/dts/stm32f769-disco.dts
+++ b/arch/arm/boot/dts/stm32f769-disco.dts
@@ -57,6 +57,19 @@
 		reg = <0xC0000000 0x1000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc0f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
diff --git a/arch/arm/boot/dts/stm32h743i-disco.dts b/arch/arm/boot/dts/stm32h743i-disco.dts
index 79e841d..104545a 100644
--- a/arch/arm/boot/dts/stm32h743i-disco.dts
+++ b/arch/arm/boot/dts/stm32h743i-disco.dts
@@ -57,6 +57,19 @@
 		reg = <0xd0000000 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc1f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart2;
 	};
diff --git a/arch/arm/boot/dts/stm32h743i-eval.dts b/arch/arm/boot/dts/stm32h743i-eval.dts
index 9f0e72c..5bd4b16 100644
--- a/arch/arm/boot/dts/stm32h743i-eval.dts
+++ b/arch/arm/boot/dts/stm32h743i-eval.dts
@@ -57,6 +57,19 @@
 		reg = <0xd0000000 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc1f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
-- 
2.7.4

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

WARNING: multiple messages have this Message-ID (diff)
From: alexandre.torgue@st.com (Alexandre Torgue)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/3] ARM: dts: stm32: add DMA memory pool on MCU which embed a cortex-M7
Date: Tue, 12 Dec 2017 19:02:24 +0100	[thread overview]
Message-ID: <1513101746-18030-2-git-send-email-alexandre.torgue@st.com> (raw)
In-Reply-To: <1513101746-18030-1-git-send-email-alexandre.torgue@st.com>

On cortex-M7 MCU, DMA have to use a non cache-able memory area. For this
reason a dedicated memory pool is created for DMA.
This patch creates a DMA memory pool of 1MB of each STM32 MCU which
embeds a cortex-M7 expect stm32f746-disco. Indeed, as stm32f746-disco has
only a 8MB SDRAM and it's tricky to reduce memory used by Kernel.

Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

diff --git a/arch/arm/boot/dts/stm32746g-eval.dts b/arch/arm/boot/dts/stm32746g-eval.dts
index 2d4e717..3f52a7b 100644
--- a/arch/arm/boot/dts/stm32746g-eval.dts
+++ b/arch/arm/boot/dts/stm32746g-eval.dts
@@ -57,6 +57,19 @@
 		reg = <0xc0000000 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc1f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
diff --git a/arch/arm/boot/dts/stm32f769-disco.dts b/arch/arm/boot/dts/stm32f769-disco.dts
index 4463ca1..08699a2 100644
--- a/arch/arm/boot/dts/stm32f769-disco.dts
+++ b/arch/arm/boot/dts/stm32f769-disco.dts
@@ -57,6 +57,19 @@
 		reg = <0xC0000000 0x1000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc0f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
diff --git a/arch/arm/boot/dts/stm32h743i-disco.dts b/arch/arm/boot/dts/stm32h743i-disco.dts
index 79e841d..104545a 100644
--- a/arch/arm/boot/dts/stm32h743i-disco.dts
+++ b/arch/arm/boot/dts/stm32h743i-disco.dts
@@ -57,6 +57,19 @@
 		reg = <0xd0000000 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc1f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart2;
 	};
diff --git a/arch/arm/boot/dts/stm32h743i-eval.dts b/arch/arm/boot/dts/stm32h743i-eval.dts
index 9f0e72c..5bd4b16 100644
--- a/arch/arm/boot/dts/stm32h743i-eval.dts
+++ b/arch/arm/boot/dts/stm32h743i-eval.dts
@@ -57,6 +57,19 @@
 		reg = <0xd0000000 0x2000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,dma {
+			compatible = "shared-dma-pool";
+			linux,dma-default;
+			no-map;
+			reg = <0xc1f00000 0x100000>;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
-- 
2.7.4

  parent reply	other threads:[~2017-12-12 18:02 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-12 18:02 [PATCH 0/3] Enable DMA on STM32 MCU based on cortex-M7 Alexandre Torgue
2017-12-12 18:02 ` Alexandre Torgue
     [not found] ` <1513101746-18030-1-git-send-email-alexandre.torgue-qxv4g6HH51o@public.gmane.org>
2017-12-12 18:02   ` Alexandre Torgue [this message]
2017-12-12 18:02     ` [PATCH 1/3] ARM: dts: stm32: add DMA memory pool on MCU which embed a cortex-M7 Alexandre Torgue
     [not found]     ` <1513101746-18030-2-git-send-email-alexandre.torgue-qxv4g6HH51o@public.gmane.org>
2017-12-13 10:06       ` Vladimir Murzin
2017-12-13 10:06         ` Vladimir Murzin
     [not found]         ` <ab9a2ef4-4944-c935-af6e-12503b477879-5wv7dgnIgG8@public.gmane.org>
2017-12-13 10:28           ` Alexandre TORGUE
2017-12-13 10:28             ` Alexandre TORGUE
2017-12-13 12:50         ` Alexandre TORGUE
2017-12-13 12:50           ` Alexandre TORGUE
2017-12-12 18:02   ` [PATCH 2/3] ARM: configs: stm32: Enable ARM_MPU Alexandre Torgue
2017-12-12 18:02     ` Alexandre Torgue
     [not found]     ` <1513101746-18030-3-git-send-email-alexandre.torgue-qxv4g6HH51o@public.gmane.org>
2017-12-13 10:11       ` Vladimir Murzin
2017-12-13 10:11         ` Vladimir Murzin
2018-02-27 17:11         ` Alexandre Torgue
2018-02-27 17:11           ` Alexandre Torgue
2017-12-12 18:02   ` [PATCH 3/3] ARM: dts: stm32: enable dma on MCU which embed a cortex-M7 Alexandre Torgue
2017-12-12 18:02     ` Alexandre Torgue

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1513101746-18030-2-git-send-email-alexandre.torgue@st.com \
    --to=alexandre.torgue-qxv4g6hh51o@public.gmane.org \
    --cc=arnd-r2nGTMty4D4@public.gmane.org \
    --cc=devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org \
    --cc=linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org \
    --cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
    --cc=mark.rutland-5wv7dgnIgG8@public.gmane.org \
    --cc=mcoquelin.stm32-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=patrice.chotard-qxv4g6HH51o@public.gmane.org \
    --cc=robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.