[U-Boot] [RFC v4 02/15] dma: add channels support
Álvaro Fernández Rojas
noltari at gmail.com
Sat Mar 3 08:59:04 UTC 2018
This adds channels support for dma controllers that have multiple channels
which can transfer data to/from different devices (enet, usb...).
Signed-off-by: Álvaro Fernández Rojas <noltari at gmail.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
v4: no changes
v3: Introduce changes reported by Simon Glass:
- Improve dma-uclass.h documentation.
- Switch to live tree API.
drivers/dma/Kconfig | 7 ++
drivers/dma/dma-uclass.c | 188 +++++++++++++++++++++++++++++++++++++++++++++--
include/dma-uclass.h | 78 ++++++++++++++++++++
include/dma.h | 174 ++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 439 insertions(+), 8 deletions(-)
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 1b92c7789d..21b2c0dcaa 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -12,6 +12,13 @@ config DMA
buses that is used to transfer data to and from memory.
The uclass interface is defined in include/dma.h.
+config DMA_CHANNELS
+ bool "Enable DMA channels support"
+ depends on DMA
+ help
+ Enable channels support for DMA. Some DMA controllers have multiple
+ channels which can either transfer data to/from different devices.
+
config TI_EDMA3
bool "TI EDMA3 driver"
help
diff --git a/drivers/dma/dma-uclass.c b/drivers/dma/dma-uclass.c
index 6fd4e1b35d..f4ba883b12 100644
--- a/drivers/dma/dma-uclass.c
+++ b/drivers/dma/dma-uclass.c
@@ -1,24 +1,200 @@
/*
* Direct Memory Access U-Class driver
*
- * (C) Copyright 2015
- * Texas Instruments Incorporated, <www.ti.com>
- *
- * Author: Mugunthan V N <mugunthanvnm at ti.com>
+ * Copyright (C) 2018 Álvaro Fernández Rojas <noltari at gmail.com>
+ * Copyright (C) 2015 Texas Instruments Incorporated <www.ti.com>
+ * Written by Mugunthan V N <mugunthanvnm at ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
-#include <dm/uclass-internal.h>
-#include <dm/device-internal.h>
+#include <dm/read.h>
#include <dma.h>
#include <dma-uclass.h>
+#include <dt-structs.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
+#ifdef CONFIG_DMA_CHANNELS
+static inline struct dma_ops *dma_dev_ops(struct udevice *dev)
+{
+ return (struct dma_ops *)dev->driver->ops;
+}
+
+# if CONFIG_IS_ENABLED(OF_CONTROL)
+# if CONFIG_IS_ENABLED(OF_PLATDATA)
+int dma_get_by_index_platdata(struct udevice *dev, int index,
+ struct phandle_1_arg *cells, struct dma *dma)
+{
+ int ret;
+
+ if (index != 0)
+ return -ENOSYS;
+ ret = uclass_get_device(UCLASS_DMA, 0, &dma->dev);
+ if (ret)
+ return ret;
+ dma->id = cells[0].id;
+
+ return 0;
+}
+# else
+static int dma_of_xlate_default(struct dma *dma,
+ struct ofnode_phandle_args *args)
+{
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (args->args_count > 1) {
+ pr_err("Invaild args_count: %d\n", args->args_count);
+ return -EINVAL;
+ }
+
+ if (args->args_count)
+ dma->id = args->args[0];
+ else
+ dma->id = 0;
+
+ return 0;
+}
+
+int dma_get_by_index(struct udevice *dev, int index, struct dma *dma)
+{
+ int ret;
+ struct ofnode_phandle_args args;
+ struct udevice *dev_dma;
+ const struct dma_ops *ops;
+
+ debug("%s(dev=%p, index=%d, dma=%p)\n", __func__, dev, index, dma);
+
+ assert(dma);
+ dma->dev = NULL;
+
+ ret = dev_read_phandle_with_args(dev, "dmas", "#dma-cells", 0, index,
+ &args);
+ if (ret) {
+ pr_err("%s: dev_read_phandle_with_args failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = uclass_get_device_by_ofnode(UCLASS_DMA, args.node, &dev_dma);
+ if (ret) {
+ pr_err("%s: uclass_get_device_by_ofnode failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ dma->dev = dev_dma;
+
+ ops = dma_dev_ops(dev_dma);
+
+ if (ops->of_xlate)
+ ret = ops->of_xlate(dma, &args);
+ else
+ ret = dma_of_xlate_default(dma, &args);
+ if (ret) {
+ pr_err("of_xlate() failed: %d\n", ret);
+ return ret;
+ }
+
+ return dma_request(dev_dma, dma);
+}
+# endif /* OF_PLATDATA */
+
+int dma_get_by_name(struct udevice *dev, const char *name, struct dma *dma)
+{
+ int index;
+
+ debug("%s(dev=%p, name=%s, dma=%p)\n", __func__, dev, name, dma);
+ dma->dev = NULL;
+
+ index = dev_read_stringlist_search(dev, "dma-names", name);
+ if (index < 0) {
+ pr_err("dev_read_stringlist_search() failed: %d\n", index);
+ return index;
+ }
+
+ return dma_get_by_index(dev, index, dma);
+}
+# endif /* OF_CONTROL */
+
+int dma_request(struct udevice *dev, struct dma *dma)
+{
+ struct dma_ops *ops = dma_dev_ops(dev);
+
+ debug("%s(dev=%p, dma=%p)\n", __func__, dev, dma);
+
+ dma->dev = dev;
+
+ if (!ops->request)
+ return 0;
+
+ return ops->request(dma);
+}
+
+int dma_free(struct dma *dma)
+{
+ struct dma_ops *ops = dma_dev_ops(dma->dev);
+
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (!ops->free)
+ return 0;
+
+ return ops->free(dma);
+}
+
+int dma_enable(struct dma *dma)
+{
+ struct dma_ops *ops = dma_dev_ops(dma->dev);
+
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (!ops->enable)
+ return -ENOSYS;
+
+ return ops->enable(dma);
+}
+
+int dma_disable(struct dma *dma)
+{
+ struct dma_ops *ops = dma_dev_ops(dma->dev);
+
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (!ops->disable)
+ return -ENOSYS;
+
+ return ops->disable(dma);
+}
+
+int dma_receive(struct dma *dma, void **dst)
+{
+ struct dma_ops *ops = dma_dev_ops(dma->dev);
+
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (!ops->receive)
+ return -1;
+
+ return ops->receive(dma, dst);
+}
+
+int dma_send(struct dma *dma, void *src, size_t len)
+{
+ struct dma_ops *ops = dma_dev_ops(dma->dev);
+
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (!ops->send)
+ return -1;
+
+ return ops->send(dma, src, len);
+}
+#endif /* CONFIG_DMA_CHANNELS */
+
int dma_get_device(u32 transfer_type, struct udevice **devp)
{
struct udevice *dev;
diff --git a/include/dma-uclass.h b/include/dma-uclass.h
index 3429f65ec4..b334adb68b 100644
--- a/include/dma-uclass.h
+++ b/include/dma-uclass.h
@@ -13,6 +13,8 @@
#include <dma.h>
+struct ofnode_phandle_args;
+
/*
* struct dma_ops - Driver model DMA operations
*
@@ -20,6 +22,82 @@
* driver model.
*/
struct dma_ops {
+#ifdef CONFIG_DMA_CHANNELS
+ /**
+ * of_xlate - Translate a client's device-tree (OF) DMA specifier.
+ *
+ * The DMA core calls this function as the first step in implementing
+ * a client's dma_get_by_*() call.
+ *
+ * If this function pointer is set to NULL, the DMA core will use a
+ * default implementation, which assumes #dma-cells = <1>, and that
+ * the DT cell contains a simple integer DMA Channel.
+ *
+ * At present, the DMA API solely supports device-tree. If this
+ * changes, other xxx_xlate() functions may be added to support those
+ * other mechanisms.
+ *
+ * @dma: The dma struct to hold the translation result.
+ * @args: The dma specifier values from device tree.
+ * @return 0 if OK, or a negative error code.
+ */
+ int (*of_xlate)(struct dma *dma,
+ struct ofnode_phandle_args *args);
+ /**
+ * request - Request a translated DMA.
+ *
+ * The DMA core calls this function as the second step in
+ * implementing a client's dma_get_by_*() call, following a successful
+ * xxx_xlate() call, or as the only step in implementing a client's
+ * dma_request() call.
+ *
+ * @dma: The DMA struct to request; this has been filled in by
+ * a previoux xxx_xlate() function call, or by the caller of
+ * dma_request().
+ * @return 0 if OK, or a negative error code.
+ */
+ int (*request)(struct dma *dma);
+ /**
+ * free - Free a previously requested dma.
+ *
+ * This is the implementation of the client dma_free() API.
+ *
+ * @dma: The DMA to free.
+ * @return 0 if OK, or a negative error code.
+ */
+ int (*free)(struct dma *dma);
+ /**
+ * enable() - Enable a DMA Channel.
+ *
+ * @dma: The DMA Channel to manipulate.
+ * @return zero on success, or -ve error code.
+ */
+ int (*enable)(struct dma *dma);
+ /**
+ * disable() - Disable a DMA Channel.
+ *
+ * @dma: The DMA Channel to manipulate.
+ * @return zero on success, or -ve error code.
+ */
+ int (*disable)(struct dma *dma);
+ /**
+ * receive() - Receive a DMA transfer.
+ *
+ * @dma: The DMA Channel to manipulate.
+ * @dst: The destination pointer.
+ * @return zero on success, or -ve error code.
+ */
+ int (*receive)(struct dma *dma, void **dst);
+ /**
+ * send() - Send a DMA transfer.
+ *
+ * @dma: The DMA Channel to manipulate.
+ * @src: The source pointer.
+ * @len: Length of the data to be sent (number of bytes).
+ * @return zero on success, or -ve error code.
+ */
+ int (*send)(struct dma *dma, void *src, size_t len);
+#endif /* CONFIG_DMA_CHANNELS */
/**
* transfer() - Issue a DMA transfer. The implementation must
* wait until the transfer is done.
diff --git a/include/dma.h b/include/dma.h
index 89320f10d9..bf8123fa9e 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -1,6 +1,7 @@
/*
- * (C) Copyright 2015
- * Texas Instruments Incorporated, <www.ti.com>
+ * Copyright (C) 2018 Álvaro Fernández Rojas <noltari at gmail.com>
+ * Copyright (C) 2015 Texas Instruments Incorporated <www.ti.com>
+ * Written by Mugunthan V N <mugunthanvnm at ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
@@ -8,6 +9,9 @@
#ifndef _DMA_H_
#define _DMA_H_
+#include <linux/errno.h>
+#include <linux/types.h>
+
/*
* enum dma_direction - dma transfer direction indicator
* @DMA_MEM_TO_MEM: Memcpy mode
@@ -37,6 +41,172 @@ struct dma_dev_priv {
u32 supported;
};
+#ifdef CONFIG_DMA_CHANNELS
+/**
+ * A DMA is a feature of computer systems that allows certain hardware
+ * subsystems to access main system memory, independent of the CPU.
+ * DMA channels are typically generated externally to the HW module
+ * consuming them, by an entity this API calls a DMA provider. This API
+ * provides a standard means for drivers to enable and disable DMAs, and to
+ * copy, send and receive data using DMA.
+ *
+ * A driver that implements UCLASS_DMA is a DMA provider. A provider will
+ * often implement multiple separate DMAs, since the hardware it manages
+ * often has this capability. dma_uclass.h describes the interface which
+ * DMA providers must implement.
+ *
+ * DMA consumers/clients are the HW modules driven by the DMA channels. This
+ * header file describes the API used by drivers for those HW modules.
+ */
+
+struct udevice;
+
+/**
+ * struct dma - A handle to (allowing control of) a single DMA.
+ *
+ * Clients provide storage for DMA handles. The content of the structure is
+ * managed solely by the DMA API and DMA drivers. A DMA struct is
+ * initialized by "get"ing the DMA struct. The DMA struct is passed to all
+ * other DMA APIs to identify which DMA channel to operate upon.
+ *
+ * @dev: The device which implements the DMA channel.
+ * @id: The DMA channel ID within the provider.
+ *
+ * Currently, the DMA API assumes that a single integer ID is enough to
+ * identify and configure any DMA channel for any DMA provider. If this
+ * assumption becomes invalid in the future, the struct could be expanded to
+ * either (a) add more fields to allow DMA providers to store additional
+ * information, or (b) replace the id field with an opaque pointer, which the
+ * provider would dynamically allocated during its .of_xlate op, and process
+ * during is .request op. This may require the addition of an extra op to clean
+ * up the allocation.
+ */
+struct dma {
+ struct udevice *dev;
+ /*
+ * Written by of_xlate. We assume a single id is enough for now. In the
+ * future, we might add more fields here.
+ */
+ unsigned long id;
+};
+
+# if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DMA)
+struct phandle_1_arg;
+int dma_get_by_index_platdata(struct udevice *dev, int index,
+ struct phandle_1_arg *cells, struct dma *dma);
+
+/**
+ * dma_get_by_index - Get/request a DMA by integer index.
+ *
+ * This looks up and requests a DMA. The index is relative to the client
+ * device; each device is assumed to have n DMAs associated with it somehow,
+ * and this function finds and requests one of them. The mapping of client
+ * device DMA indices to provider DMAs may be via device-tree properties,
+ * board-provided mapping tables, or some other mechanism.
+ *
+ * @dev: The client device.
+ * @index: The index of the DMA to request, within the client's list of
+ * DMA channels.
+ * @dma: A pointer to a DMA struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int dma_get_by_index(struct udevice *dev, int index, struct dma *dma);
+
+/**
+ * dma_get_by_name - Get/request a DMA by name.
+ *
+ * This looks up and requests a DMA. The name is relative to the client
+ * device; each device is assumed to have n DMAs associated with it somehow,
+ * and this function finds and requests one of them. The mapping of client
+ * device DMA names to provider DMAs may be via device-tree properties,
+ * board-provided mapping tables, or some other mechanism.
+ *
+ * @dev: The client device.
+ * @name: The name of the DMA to request, within the client's list of
+ * DMA channels.
+ * @dma: A pointer to a DMA struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int dma_get_by_name(struct udevice *dev, const char *name, struct dma *dma);
+# else
+static inline int dma_get_by_index(struct udevice *dev, int index,
+ struct dma *dma)
+{
+ return -ENOSYS;
+}
+
+static inline int dma_get_by_name(struct udevice *dev, const char *name,
+ struct dma *dma)
+{
+ return -ENOSYS;
+}
+# endif
+
+/**
+ * dma_request - Request a DMA by provider-specific ID.
+ *
+ * This requests a DMA using a provider-specific ID. Generally, this function
+ * should not be used, since dma_get_by_index/name() provide an interface that
+ * better separates clients from intimate knowledge of DMA providers.
+ * However, this function may be useful in core SoC-specific code.
+ *
+ * @dev: The DMA provider device.
+ * @dma: A pointer to a DMA struct to initialize. The caller must
+ * have already initialized any field in this struct which the
+ * DMA provider uses to identify the DMA channel.
+ * @return 0 if OK, or a negative error code.
+ */
+int dma_request(struct udevice *dev, struct dma *dma);
+
+/**
+ * dma_free - Free a previously requested DMA.
+ *
+ * @dma: A DMA struct that was previously successfully requested by
+ * dma_request/get_by_*().
+ * @return 0 if OK, or a negative error code.
+ */
+int dma_free(struct dma *dma);
+
+/**
+ * dma_enable() - Enable (turn on) a DMA channel.
+ *
+ * @dma: A DMA struct that was previously successfully requested by
+ * dma_request/get_by_*().
+ * @return zero on success, or -ve error code.
+ */
+int dma_enable(struct dma *dma);
+
+/**
+ * dma_disable() - Disable (turn off) a DMA channel.
+ *
+ * @dma: A DMA struct that was previously successfully requested by
+ * dma_request/get_by_*().
+ * @return zero on success, or -ve error code.
+ */
+int dma_disable(struct dma *dma);
+
+/**
+ * dma_receive() - Receive a DMA transfer.
+ *
+ * @dma: A DMA struct that was previously successfully requested by
+ * dma_request/get_by_*().
+ * @dst: The destination pointer.
+ * @return zero on success, or -ve error code.
+ */
+int dma_receive(struct dma *dma, void **dst);
+
+/**
+ * dma_send() - Send a DMA transfer.
+ *
+ * @dma: A DMA struct that was previously successfully requested by
+ * dma_request/get_by_*().
+ * @src: The source pointer.
+ * @len: Length of the data to be sent (number of bytes).
+ * @return zero on success, or -ve error code.
+ */
+int dma_send(struct dma *dma, void *src, size_t len);
+#endif /* CONFIG_DMA_CHANNELS */
+
/*
* dma_get_device - get a DMA device which supports transfer
* type of transfer_type
--
2.11.0
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