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Message-Id: <1447721855-7574-3-git-send-email-laura@labbott.name>
Date: Mon, 16 Nov 2015 16:57:34 -0800
From: Laura Abbott <laura@...bott.name>
To: Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>,
Sumit Semwal <sumit.semwal@...aro.org>,
Andrew Andrianov <andrew@...mnt.org>, <arve@...roid.com>,
Riley Andrews <riandrews@...roid.com>
Cc: Laura Abbott <laura@...bott.name>,
John Stultz <john.stultz@...aro.org>,
Grant Likely <grant.likely@...aro.org>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Tom Gall <tom.gall@...aro.org>,
Colin Cross <ccross@...gle.com>, devel@...verdev.osuosl.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
romlem@...gle.com, mitchelh@...eaurora.org,
linux-arm-kernel@...ts.infradead.org,
Feng Tang <feng.tang@...el.com>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCHv2 2/3] staging: ion: Add files for parsing the devicetree
Devicetree is the preferred mechanism for platform definition
these days. Add a set of files for supporting Ion with devicetree.
This is a set of functions for drivers to call to parse the Ion
devicetree along with definitons for defining heaps.
Signed-off-by: Laura Abbott <laura@...bott.name>
---
drivers/staging/android/ion/Kconfig | 10 +++
drivers/staging/android/ion/Makefile | 1 +
drivers/staging/android/ion/ion_of.c | 168 +++++++++++++++++++++++++++++++++++
drivers/staging/android/ion/ion_of.h | 35 ++++++++
4 files changed, 214 insertions(+)
create mode 100644 drivers/staging/android/ion/ion_of.c
create mode 100644 drivers/staging/android/ion/ion_of.h
diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
index 3452346..9b6d65d 100644
--- a/drivers/staging/android/ion/Kconfig
+++ b/drivers/staging/android/ion/Kconfig
@@ -33,3 +33,13 @@ config ION_TEGRA
help
Choose this option if you wish to use ion on an nVidia Tegra.
+config ION_OF
+ bool "Devicetree support for Ion"
+ depends on ION && OF
+ help
+ Provides base support for defining Ion heaps in devicetree
+ and setting them up. Also includes functions for platforms
+ to parse the devicetree and expand for their own custom
+ extensions
+
+ If using Ion and devicetree, you should say Y here
diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index b56fd2b..a77417b 100644
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -7,4 +7,5 @@ endif
obj-$(CONFIG_ION_DUMMY) += ion_dummy_driver.o
obj-$(CONFIG_ION_TEGRA) += tegra/
+obj-$(CONFIG_ION_OF) += ion_of.o ion_physmem.o
diff --git a/drivers/staging/android/ion/ion_of.c b/drivers/staging/android/ion/ion_of.c
new file mode 100644
index 0000000..9a56194
--- /dev/null
+++ b/drivers/staging/android/ion/ion_of.c
@@ -0,0 +1,168 @@
+/*
+ * Based on work from:
+ * Andrew Andrianov <andrew@...mnt.org>
+ * Google
+ * The Linux Foundation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/cma.h>
+#include <linux/dma-contiguous.h>
+#include <linux/io.h>
+#include <linux/of_reserved_mem.h>
+#include "ion.h"
+#include "ion_priv.h"
+#include "ion_of.h"
+
+int ion_parse_dt_heap_common(struct device_node *heap_node,
+ struct ion_platform_heap *heap,
+ struct ion_of_heap *compatible)
+{
+ int i;
+
+ for (i = 0; compatible[i].name != NULL; i++) {
+ if (of_device_is_compatible(heap_node, compatible[i].compat))
+ break;
+ }
+
+ if (compatible[i].name == NULL)
+ return -ENODEV;
+
+ heap->id = compatible[i].heap_id;
+ heap->type = compatible[i].type;
+ heap->name = compatible[i].name;
+ heap->align = compatible[i].align;
+
+ /* Some kind of callback function pointer? */
+
+ pr_info("%s: id %d type %d name %s align %lx\n", __func__,
+ heap->id, heap->type, heap->name, heap->align);
+ return 0;
+}
+
+int ion_setup_heap_common(struct platform_device *parent,
+ struct device_node *heap_node,
+ struct ion_platform_heap *heap)
+{
+ int ret = 0;
+
+ switch (heap->type) {
+ case ION_HEAP_TYPE_CARVEOUT:
+ case ION_HEAP_TYPE_CHUNK:
+ if (heap->base && heap->size)
+ return 0;
+
+ ret = of_reserved_mem_device_init(heap->priv);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+struct ion_platform_data *ion_parse_dt(struct platform_device *pdev,
+ struct ion_of_heap *compatible)
+{
+ int num_heaps, ret;
+ const struct device_node *dt_node = pdev->dev.of_node;
+ struct device_node *node;
+ struct ion_platform_heap *heaps;
+ struct ion_platform_data *data;
+ int i = 0;
+
+ num_heaps = of_get_available_child_count(dt_node);
+
+ if (!num_heaps)
+ return ERR_PTR(-EINVAL);
+
+ heaps = devm_kzalloc(&pdev->dev,
+ sizeof(struct ion_platform_heap)*num_heaps,
+ GFP_KERNEL);
+ if (!heaps)
+ return ERR_PTR(-ENOMEM);
+
+ data = devm_kzalloc(&pdev->dev, sizeof(struct ion_platform_data),
+ GFP_KERNEL);
+ if (!data)
+ return ERR_PTR(-ENOMEM);
+
+ for_each_available_child_of_node(dt_node, node) {
+ struct platform_device *heap_pdev;
+
+ ret = ion_parse_dt_heap_common(node, &heaps[i], compatible);
+ if (ret)
+ return ERR_PTR(ret);
+
+ heap_pdev = of_platform_device_create(node, heaps[i].name,
+ &pdev->dev);
+ if (!pdev)
+ return ERR_PTR(-ENOMEM);
+ heap_pdev->dev.platform_data = &heaps[i];
+
+ heaps[i].priv = &heap_pdev->dev;
+
+ ret = ion_setup_heap_common(pdev, node, &heaps[i]);
+ if (ret)
+ return ERR_PTR(ret);
+ i++;
+ }
+
+
+ data->heaps = heaps;
+ data->nr = num_heaps;
+ return data;
+}
+
+#ifdef CONFIG_OF_RESERVED_MEM
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_reserved_mem.h>
+
+static int rmem_ion_device_init(struct reserved_mem *rmem, struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct ion_platform_heap *heap = pdev->dev.platform_data;
+
+ heap->base = rmem->base;
+ heap->base = rmem->size;
+ pr_debug("%s: heap %s base %pa size %pa dev %p\n", __func__,
+ heap->name, &rmem->base, &rmem->size, dev);
+ return 0;
+}
+
+static void rmem_ion_device_release(struct reserved_mem *rmem,
+ struct device *dev)
+{
+ return;
+}
+
+static const struct reserved_mem_ops rmem_dma_ops = {
+ .device_init = rmem_ion_device_init,
+ .device_release = rmem_ion_device_release,
+};
+
+static int __init rmem_ion_setup(struct reserved_mem *rmem)
+{
+ phys_addr_t size = rmem->size;
+
+ size = size / 1024;
+
+ pr_info("Ion memory setup at %pa size %pa MiB\n",
+ &rmem->base, &size);
+ rmem->ops = &rmem_dma_ops;
+ return 0;
+}
+RESERVEDMEM_OF_DECLARE(ion, "ion-region", rmem_ion_setup);
+#endif
diff --git a/drivers/staging/android/ion/ion_of.h b/drivers/staging/android/ion/ion_of.h
new file mode 100644
index 0000000..6b767e7
--- /dev/null
+++ b/drivers/staging/android/ion/ion_of.h
@@ -0,0 +1,35 @@
+/*
+ * Based on work from:
+ * Andrew Andrianov <andrew@...mnt.org>
+ * Google
+ * The Linux Foundation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _ION_OF_H
+#define _ION_OF_H
+
+struct ion_of_heap {
+ const char *compat;
+ int heap_id;
+ int type;
+ const char *name;
+ int align;
+};
+
+#define PLATFORM_HEAP(_compat, _id, _type, _name) \
+{ \
+ .compat = _compat, \
+ .heap_id = _id, \
+ .type = _type, \
+ .name = _name, \
+ .align = PAGE_SIZE, \
+}
+
+struct ion_platform_data *ion_parse_dt(struct platform_device *pdev,
+ struct ion_of_heap *compatible);
+
+#endif
--
2.5.0
--
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