[PATCH v8 3/4] media: coda: use genalloc API

Philipp Zabel
2013-02-04T11:33:40Z

This patch depends on "genalloc: add devres support, allow to find
a managed pool by device", which provides the of_get_named_gen_pool
and dev_get_gen_pool functions.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
Changes since v7:
- In the platform data case, retrieve gen_pool by device instead of
by physical address. The information about the SRAM pool can't be
provided via memory resource, so add a platform data struct that
contains a pointer to the SRAM device.
- Add device tree binding documentation.
---
Documentation/devicetree/bindings/media/coda.txt | 30 +++++++++++++++
drivers/media/platform/Kconfig | 1 -
drivers/media/platform/coda.c | 45 +++++++++++++++-------
include/linux/platform_data/coda.h | 18 +++++++++
4 files changed, 79 insertions(+), 15 deletions(-)
create mode 100644 Documentation/devicetree/bindings/media/coda.txt
create mode 100644 include/linux/platform_data/coda.h

diff --git a/Documentation/devicetree/bindings/media/coda.txt b/Documentation/devicetree/bindings/media/coda.txt
new file mode 100644
index 0000000..2865d04
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/coda.txt
@@ -0,0 +1,30 @@
+Chips&Media Coda multi-standard codec IP
+========================================
+
+Coda codec IPs are present in i.MX SoCs in various versions,
+called VPU (Video Processing Unit).
+
+Required properties:
+- compatible : should be "fsl,<chip>-src" for i.MX SoCs:
+ (a) "fsl,imx27-vpu" for CodaDx6 present in i.MX27
+ (b) "fsl,imx53-vpu" for CODA7541 present in i.MX53
+ (c) "fsl,imx6q-vpu" for CODA960 present in i.MX6q
+- reg: should be register base and length as documented in the
+ SoC reference manual
+- interrupts : Should contain the VPU interrupt. For CODA960,
+ a second interrupt is needed for the MJPEG unit.
+- clocks : Should contain the ahb and per clocks, in the order
+ determined by the clock-names property.
+- clock-names : Should be "ahb", "per"
+- iram : phandle pointing to the SRAM device node
+
+Example:
+
+vpu: vpu@63ff4000 {
+ compatible = "fsl,imx53-vpu";
+ reg = <0x63ff4000 0x1000>;
+ interrupts = <9>;
+ clocks = <&clks 63>, <&clks 63>;
+ clock-names = "ahb", "per";
+ iram = <&ocram>;
+};
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 05d7b63..bbf83c1 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -145,7 +145,6 @@ config VIDEO_CODA
depends on VIDEO_DEV && VIDEO_V4L2 && ARCH_MXC
select VIDEOBUF2_DMA_CONTIG
select V4L2_MEM2MEM_DEV
- select IRAM_ALLOC if SOC_IMX53
---help---
Coda is a range of video codec IPs that supports
H.264, MPEG-4, and other video formats.
diff --git a/drivers/media/platform/coda.c b/drivers/media/platform/coda.c
index 20827ba..b931c2a 100644
--- a/drivers/media/platform/coda.c
+++ b/drivers/media/platform/coda.c
@@ -14,6 +14,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/firmware.h>
+#include <linux/genalloc.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
@@ -23,7 +24,7 @@
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/of.h>
-#include <linux/platform_data/imx-iram.h>
+#include <linux/platform_data/coda.h>

#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
@@ -43,6 +44,7 @@
#define CODA7_WORK_BUF_SIZE (512 * 1024 + CODA_FMO_BUF_SIZE * 8 * 1024)
#define CODA_PARA_BUF_SIZE (10 * 1024)
#define CODA_ISRAM_SIZE (2048 * 2)
+#define CODADX6_IRAM_SIZE 0xb000
#define CODA7_IRAM_SIZE 0x14000 /* 81920 bytes */

#define CODA_MAX_FRAMEBUFFERS 2
@@ -128,7 +130,10 @@ struct coda_dev {

struct coda_aux_buf codebuf;
struct coda_aux_buf workbuf;
+ struct gen_pool *iram_pool;
+ long unsigned int iram_vaddr;
long unsigned int iram_paddr;
+ unsigned long iram_size;

spinlock_t irqlock;
struct mutex dev_mutex;
@@ -1926,6 +1931,9 @@ static int coda_probe(struct platform_device *pdev)
const struct of_device_id *of_id =
of_match_device(of_match_ptr(coda_dt_ids), &pdev->dev);
const struct platform_device_id *pdev_id;
+ struct coda_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
+ struct gen_pool *pool;
struct coda_dev *dev;
struct resource *res;
int ret, irq;
@@ -1988,6 +1996,16 @@ static int coda_probe(struct platform_device *pdev)
return -ENOENT;
}

+ /* Get IRAM pool from device tree or platform data */
+ pool = of_get_named_gen_pool(np, "iram", 0);
+ if (!pool && pdata)
+ pool = dev_get_gen_pool(pdata->iram_dev);
+ if (!pool) {
+ dev_err(&pdev->dev, "iram pool not available\n");
+ return -ENOMEM;
+ }
+ dev->iram_pool = pool;
+
ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
if (ret)
return ret;
@@ -2022,18 +2040,17 @@ static int coda_probe(struct platform_device *pdev)
return -ENOMEM;
}

- if (dev->devtype->product == CODA_DX6) {
- dev->iram_paddr = 0xffff4c00;
- } else {
- void __iomem *iram_vaddr;
-
- iram_vaddr = iram_alloc(CODA7_IRAM_SIZE,
- &dev->iram_paddr);
- if (!iram_vaddr) {
- dev_err(&pdev->dev, "unable to alloc iram\n");
- return -ENOMEM;
- }
+ if (dev->devtype->product == CODA_DX6)
+ dev->iram_size = CODADX6_IRAM_SIZE;
+ else
+ dev->iram_size = CODA7_IRAM_SIZE;
+ dev->iram_vaddr = gen_pool_alloc(dev->iram_pool, dev->iram_size);
+ if (!dev->iram_vaddr) {
+ dev_err(&pdev->dev, "unable to alloc iram\n");
+ return -ENOMEM;
}
+ dev->iram_paddr = gen_pool_virt_to_phys(dev->iram_pool,
+ dev->iram_vaddr);

platform_set_drvdata(pdev, dev);

@@ -2050,8 +2067,8 @@ static int coda_remove(struct platform_device *pdev)
if (dev->alloc_ctx)
vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
v4l2_device_unregister(&dev->v4l2_dev);
- if (dev->iram_paddr)
- iram_free(dev->iram_paddr, CODA7_IRAM_SIZE);
+ if (dev->iram_vaddr)
+ gen_pool_free(dev->iram_pool, dev->iram_vaddr, dev->iram_size);
if (dev->codebuf.vaddr)
dma_free_coherent(&pdev->dev, dev->codebuf.size,
&dev->codebuf.vaddr, dev->codebuf.paddr);
diff --git a/include/linux/platform_data/coda.h b/include/linux/platform_data/coda.h
new file mode 100644
index 0000000..6ad4410
--- /dev/null
+++ b/include/linux/platform_data/coda.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2013 Philipp Zabel, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#ifndef PLATFORM_CODA_H
+#define PLATFORM_CODA_H
+
+struct device;
+
+struct coda_platform_data {
+ struct device *iram_dev;
+};
+
+#endif
--
1.7.10.4