From: Philipp Zabel <p.zabel@pengutronix.de>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Shawn Guo <shawn.guo@linaro.org>,
Richard Zhao <richard.zhao@freescale.com>,
Huang Shijie <shijie8@gmail.com>,
Dong Aisheng <dong.aisheng@linaro.org>,
kernel@pengutronix.de, devicetree-discuss@lists.ozlabs.org
Subject: [PATCH v2 0/9] Add device tree support for on-chip SRAM
Date: Fri, 31 Aug 2012 11:26:55 +0200 [thread overview]
Message-ID: <1346405224-20399-1-git-send-email-p.zabel@pengutronix.de> (raw)
These patches add support to configure on-chip SRAM via device-tree
node and to obtain the resulting genalloc pool from a phandle pointing
at the node.
This allows drivers to allocate SRAM with the genalloc API without
hard-coding the genalloc pool address.
The on-chip SRAM on i.MX53 and i.MX6q is registered via device tree and
changed to use the simple generic SRAM driver:
ocram: ocram@00900000 {
compatible = "fsl,imx-ocram", "sram";
reg = <0x00900000 0x3f000>;
};
A driver that needs to allocate SRAM buffers, like the video processing
unit on i.MX53, can retrieve the genalloc pool from a phandle in the
device tree using of_get_named_gen_pool(node, "iram", 0) from patch 5:
vpu@63ff4000 {
/* ... */
iram = <&ocram>;
};
Changes since v1:
- Added a generic SRAM driver in drivers/misc that does nothing but
request/ioremap its given memory region and serve it via the genalloc
API.
- Renamed the i.MX device tree nodes from "iram" to "ocram".
regards
Philipp
---
arch/arm/boot/dts/imx53.dtsi | 5 ++
arch/arm/boot/dts/imx6q.dtsi | 5 ++
arch/arm/plat-mxc/Kconfig | 4 --
arch/arm/plat-mxc/Makefile | 1 -
arch/arm/plat-mxc/include/mach/iram.h | 41 -------------
arch/arm/plat-mxc/iram_alloc.c | 73 -----------------------
drivers/misc/Kconfig | 8 +++
drivers/misc/Makefile | 1 +
drivers/misc/sram.c | 105 +++++++++++++++++++++++++++++++++
include/linux/genalloc.h | 14 +++++
lib/genalloc.c | 77 ++++++++++++++++++++++++
11 files changed, 215 insertions(+), 119 deletions(-)
next reply other threads:[~2012-08-31 9:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-31 9:26 Philipp Zabel [this message]
2012-08-31 9:26 ` [PATCH v2 1/9] ARM i.MX: Switch IRAM allocator to device tree initialization Philipp Zabel
2012-08-31 9:26 ` [PATCH v2 2/9] ARM i.MX53: Add OCRAM to device tree Philipp Zabel
2012-08-31 9:26 ` [PATCH v2 3/9] ARM i.MX6: " Philipp Zabel
2012-08-31 9:26 ` [PATCH v2 4/9] iram_alloc: store the virt and phys mem address in gen_pool chunks Philipp Zabel
2012-08-31 9:27 ` [PATCH v2 5/9] genalloc: add a global pool list, allow to find pools by phys address Philipp Zabel
2012-09-03 2:09 ` Shawn Guo
2012-08-31 9:27 ` [PATCH v2 6/9] misc: Generic on-chip SRAM allocation driver Philipp Zabel
2012-08-31 9:37 ` Jan Lübbe
2012-08-31 9:40 ` Shilimkar, Santosh
2012-09-03 2:19 ` Shawn Guo
2012-08-31 9:27 ` [PATCH v2 7/9] ARM: i.MX53: use generic on-chip SRAM allocator driver for OCRAM Philipp Zabel
2012-08-31 9:27 ` [PATCH v2 8/9] ARM: i.MX6: " Philipp Zabel
2012-08-31 9:27 ` [PATCH v2 9/9] ARM i.MX: remove IRAM_ALLOC facility Philipp Zabel
2012-09-03 1:53 ` [PATCH v2 0/9] Add device tree support for on-chip SRAM Shawn Guo
2012-09-03 15:42 ` Philipp Zabel
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