config DMA_VIRTUAL_CHANNELS
tristate
+config DMA_OF
+ def_bool y
+ depends on OF
+
comment "DMA Clients"
depends on DMA_ENGINE
obj-$(CONFIG_DMA_ENGINE) += dmaengine.o
obj-$(CONFIG_DMA_VIRTUAL_CHANNELS) += virt-dma.o
+obj-$(CONFIG_DMA_OF) += of-dma.o
+
obj-$(CONFIG_NET_DMA) += iovlock.o
obj-$(CONFIG_INTEL_MID_DMAC) += intel_mid_dma.o
obj-$(CONFIG_DMATEST) += dmatest.o
--- /dev/null
+/*
+ * Device tree helpers for DMA request / controller
+ *
+ * Based on of_gpio.c
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/rculist.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+
+static LIST_HEAD(of_dma_list);
+static DEFINE_SPINLOCK(of_dma_lock);
+
+/**
+ * of_dma_get_controller - Get a DMA controller in DT DMA helpers list
+ * @dma_spec: pointer to DMA specifier as found in the device tree
+ *
+ * Finds a DMA controller with matching device node and number for dma cells
+ * in a list of registered DMA controllers. If a match is found the use_count
+ * variable is increased and a valid pointer to the DMA data stored is retuned.
+ * A NULL pointer is returned if no match is found.
+ */
+static struct of_dma *of_dma_get_controller(struct of_phandle_args *dma_spec)
+{
+ struct of_dma *ofdma;
+
+ spin_lock(&of_dma_lock);
+
+ if (list_empty(&of_dma_list)) {
+ spin_unlock(&of_dma_lock);
+ return NULL;
+ }
+
+ list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
+ if ((ofdma->of_node == dma_spec->np) &&
+ (ofdma->of_dma_nbcells == dma_spec->args_count)) {
+ ofdma->use_count++;
+ spin_unlock(&of_dma_lock);
+ return ofdma;
+ }
+
+ spin_unlock(&of_dma_lock);
+
+ pr_debug("%s: can't find DMA controller %s\n", __func__,
+ dma_spec->np->full_name);
+
+ return NULL;
+}
+
+/**
+ * of_dma_put_controller - Decrement use count for a registered DMA controller
+ * @of_dma: pointer to DMA controller data
+ *
+ * Decrements the use_count variable in the DMA data structure. This function
+ * should be called only when a valid pointer is returned from
+ * of_dma_get_controller() and no further accesses to data referenced by that
+ * pointer are needed.
+ */
+static void of_dma_put_controller(struct of_dma *ofdma)
+{
+ spin_lock(&of_dma_lock);
+ ofdma->use_count--;
+ spin_unlock(&of_dma_lock);
+}
+
+/**
+ * of_dma_controller_register - Register a DMA controller to DT DMA helpers
+ * @np: device node of DMA controller
+ * @of_dma_xlate: translation function which converts a phandle
+ * arguments list into a dma_chan structure
+ * @data pointer to controller specific data to be used by
+ * translation function
+ *
+ * Returns 0 on success or appropriate errno value on error.
+ *
+ * Allocated memory should be freed with appropriate of_dma_controller_free()
+ * call.
+ */
+int of_dma_controller_register(struct device_node *np,
+ struct dma_chan *(*of_dma_xlate)
+ (struct of_phandle_args *, struct of_dma *),
+ void *data)
+{
+ struct of_dma *ofdma;
+ int nbcells;
+
+ if (!np || !of_dma_xlate) {
+ pr_err("%s: not enough information provided\n", __func__);
+ return -EINVAL;
+ }
+
+ ofdma = kzalloc(sizeof(*ofdma), GFP_KERNEL);
+ if (!ofdma)
+ return -ENOMEM;
+
+ nbcells = be32_to_cpup(of_get_property(np, "#dma-cells", NULL));
+ if (!nbcells) {
+ pr_err("%s: #dma-cells property is missing or invalid\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ ofdma->of_node = np;
+ ofdma->of_dma_nbcells = nbcells;
+ ofdma->of_dma_xlate = of_dma_xlate;
+ ofdma->of_dma_data = data;
+ ofdma->use_count = 0;
+
+ /* Now queue of_dma controller structure in list */
+ list_add_tail(&ofdma->of_dma_controllers, &of_dma_list);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_dma_controller_register);
+
+/**
+ * of_dma_controller_free - Remove a DMA controller from DT DMA helpers list
+ * @np: device node of DMA controller
+ *
+ * Memory allocated by of_dma_controller_register() is freed here.
+ */
+int of_dma_controller_free(struct device_node *np)
+{
+ struct of_dma *ofdma;
+
+ spin_lock(&of_dma_lock);
+
+ if (list_empty(&of_dma_list)) {
+ spin_unlock(&of_dma_lock);
+ return -ENODEV;
+ }
+
+ list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
+ if (ofdma->of_node == np) {
+ if (ofdma->use_count) {
+ spin_unlock(&of_dma_lock);
+ return -EBUSY;
+ }
+
+ list_del(&ofdma->of_dma_controllers);
+ spin_unlock(&of_dma_lock);
+ kfree(ofdma);
+ return 0;
+ }
+
+ spin_unlock(&of_dma_lock);
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(of_dma_controller_free);
+
+/**
+ * of_dma_match_channel - Check if a DMA specifier matches name
+ * @np: device node to look for DMA channels
+ * @name: channel name to be matched
+ * @index: index of DMA specifier in list of DMA specifiers
+ * @dma_spec: pointer to DMA specifier as found in the device tree
+ *
+ * Check if the DMA specifier pointed to by the index in a list of DMA
+ * specifiers, matches the name provided. Returns 0 if the name matches and
+ * a valid pointer to the DMA specifier is found. Otherwise returns -ENODEV.
+ */
+static int of_dma_match_channel(struct device_node *np, char *name, int index,
+ struct of_phandle_args *dma_spec)
+{
+ const char *s;
+
+ if (of_property_read_string_index(np, "dma-names", index, &s))
+ return -ENODEV;
+
+ if (strcmp(name, s))
+ return -ENODEV;
+
+ if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
+ dma_spec))
+ return -ENODEV;
+
+ return 0;
+}
+
+/**
+ * of_dma_request_slave_channel - Get the DMA slave channel
+ * @np: device node to get DMA request from
+ * @name: name of desired channel
+ *
+ * Returns pointer to appropriate dma channel on success or NULL on error.
+ */
+struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
+ char *name)
+{
+ struct of_phandle_args dma_spec;
+ struct of_dma *ofdma;
+ struct dma_chan *chan;
+ int count, i;
+
+ if (!np || !name) {
+ pr_err("%s: not enough information provided\n", __func__);
+ return NULL;
+ }
+
+ count = of_property_count_strings(np, "dma-names");
+ if (count < 0) {
+ pr_err("%s: dma-names property missing or empty\n", __func__);
+ return NULL;
+ }
+
+ for (i = 0; i < count; i++) {
+ if (of_dma_match_channel(np, name, i, &dma_spec))
+ continue;
+
+ ofdma = of_dma_get_controller(&dma_spec);
+
+ if (!ofdma)
+ continue;
+
+ chan = ofdma->of_dma_xlate(&dma_spec, ofdma);
+
+ of_dma_put_controller(ofdma);
+
+ of_node_put(dma_spec.np);
+
+ if (chan)
+ return chan;
+ }
+
+ return NULL;
+}
+
+/**
+ * of_dma_simple_xlate - Simple DMA engine translation function
+ * @dma_spec: pointer to DMA specifier as found in the device tree
+ * @of_dma: pointer to DMA controller data
+ *
+ * A simple translation function for devices that use a 32-bit value for the
+ * filter_param when calling the DMA engine dma_request_channel() function.
+ * Note that this translation function requires that #dma-cells is equal to 1
+ * and the argument of the dma specifier is the 32-bit filter_param. Returns
+ * pointer to appropriate dma channel on success or NULL on error.
+ */
+struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ int count = dma_spec->args_count;
+ struct of_dma_filter_info *info = ofdma->of_dma_data;
+
+ if (!info || !info->filter_fn)
+ return NULL;
+
+ if (count != 1)
+ return NULL;
+
+ return dma_request_channel(info->dma_cap, info->filter_fn,
+ &dma_spec->args[0]);
+}
+EXPORT_SYMBOL_GPL(of_dma_simple_xlate);
-obj-y = base.o dma.o
+obj-y = base.o
obj-$(CONFIG_OF_FLATTREE) += fdt.o
obj-$(CONFIG_OF_PROMTREE) += pdt.o
obj-$(CONFIG_OF_ADDRESS) += address.o
+++ /dev/null
-/*
- * Device tree helpers for DMA request / controller
- *
- * Based on of_gpio.c
- *
- * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
- *
- * 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/device.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/rculist.h>
-#include <linux/slab.h>
-#include <linux/of.h>
-#include <linux/of_dma.h>
-
-static LIST_HEAD(of_dma_list);
-static DEFINE_SPINLOCK(of_dma_lock);
-
-/**
- * of_dma_get_controller - Get a DMA controller in DT DMA helpers list
- * @dma_spec: pointer to DMA specifier as found in the device tree
- *
- * Finds a DMA controller with matching device node and number for dma cells
- * in a list of registered DMA controllers. If a match is found the use_count
- * variable is increased and a valid pointer to the DMA data stored is retuned.
- * A NULL pointer is returned if no match is found.
- */
-static struct of_dma *of_dma_get_controller(struct of_phandle_args *dma_spec)
-{
- struct of_dma *ofdma;
-
- spin_lock(&of_dma_lock);
-
- if (list_empty(&of_dma_list)) {
- spin_unlock(&of_dma_lock);
- return NULL;
- }
-
- list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
- if ((ofdma->of_node == dma_spec->np) &&
- (ofdma->of_dma_nbcells == dma_spec->args_count)) {
- ofdma->use_count++;
- spin_unlock(&of_dma_lock);
- return ofdma;
- }
-
- spin_unlock(&of_dma_lock);
-
- pr_debug("%s: can't find DMA controller %s\n", __func__,
- dma_spec->np->full_name);
-
- return NULL;
-}
-
-/**
- * of_dma_put_controller - Decrement use count for a registered DMA controller
- * @of_dma: pointer to DMA controller data
- *
- * Decrements the use_count variable in the DMA data structure. This function
- * should be called only when a valid pointer is returned from
- * of_dma_get_controller() and no further accesses to data referenced by that
- * pointer are needed.
- */
-static void of_dma_put_controller(struct of_dma *ofdma)
-{
- spin_lock(&of_dma_lock);
- ofdma->use_count--;
- spin_unlock(&of_dma_lock);
-}
-
-/**
- * of_dma_controller_register - Register a DMA controller to DT DMA helpers
- * @np: device node of DMA controller
- * @of_dma_xlate: translation function which converts a phandle
- * arguments list into a dma_chan structure
- * @data pointer to controller specific data to be used by
- * translation function
- *
- * Returns 0 on success or appropriate errno value on error.
- *
- * Allocated memory should be freed with appropriate of_dma_controller_free()
- * call.
- */
-int of_dma_controller_register(struct device_node *np,
- struct dma_chan *(*of_dma_xlate)
- (struct of_phandle_args *, struct of_dma *),
- void *data)
-{
- struct of_dma *ofdma;
- int nbcells;
-
- if (!np || !of_dma_xlate) {
- pr_err("%s: not enough information provided\n", __func__);
- return -EINVAL;
- }
-
- ofdma = kzalloc(sizeof(*ofdma), GFP_KERNEL);
- if (!ofdma)
- return -ENOMEM;
-
- nbcells = be32_to_cpup(of_get_property(np, "#dma-cells", NULL));
- if (!nbcells) {
- pr_err("%s: #dma-cells property is missing or invalid\n",
- __func__);
- return -EINVAL;
- }
-
- ofdma->of_node = np;
- ofdma->of_dma_nbcells = nbcells;
- ofdma->of_dma_xlate = of_dma_xlate;
- ofdma->of_dma_data = data;
- ofdma->use_count = 0;
-
- /* Now queue of_dma controller structure in list */
- list_add_tail(&ofdma->of_dma_controllers, &of_dma_list);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(of_dma_controller_register);
-
-/**
- * of_dma_controller_free - Remove a DMA controller from DT DMA helpers list
- * @np: device node of DMA controller
- *
- * Memory allocated by of_dma_controller_register() is freed here.
- */
-int of_dma_controller_free(struct device_node *np)
-{
- struct of_dma *ofdma;
-
- spin_lock(&of_dma_lock);
-
- if (list_empty(&of_dma_list)) {
- spin_unlock(&of_dma_lock);
- return -ENODEV;
- }
-
- list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers)
- if (ofdma->of_node == np) {
- if (ofdma->use_count) {
- spin_unlock(&of_dma_lock);
- return -EBUSY;
- }
-
- list_del(&ofdma->of_dma_controllers);
- spin_unlock(&of_dma_lock);
- kfree(ofdma);
- return 0;
- }
-
- spin_unlock(&of_dma_lock);
- return -ENODEV;
-}
-EXPORT_SYMBOL_GPL(of_dma_controller_free);
-
-/**
- * of_dma_match_channel - Check if a DMA specifier matches name
- * @np: device node to look for DMA channels
- * @name: channel name to be matched
- * @index: index of DMA specifier in list of DMA specifiers
- * @dma_spec: pointer to DMA specifier as found in the device tree
- *
- * Check if the DMA specifier pointed to by the index in a list of DMA
- * specifiers, matches the name provided. Returns 0 if the name matches and
- * a valid pointer to the DMA specifier is found. Otherwise returns -ENODEV.
- */
-static int of_dma_match_channel(struct device_node *np, char *name, int index,
- struct of_phandle_args *dma_spec)
-{
- const char *s;
-
- if (of_property_read_string_index(np, "dma-names", index, &s))
- return -ENODEV;
-
- if (strcmp(name, s))
- return -ENODEV;
-
- if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
- dma_spec))
- return -ENODEV;
-
- return 0;
-}
-
-/**
- * of_dma_request_slave_channel - Get the DMA slave channel
- * @np: device node to get DMA request from
- * @name: name of desired channel
- *
- * Returns pointer to appropriate dma channel on success or NULL on error.
- */
-struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
- char *name)
-{
- struct of_phandle_args dma_spec;
- struct of_dma *ofdma;
- struct dma_chan *chan;
- int count, i;
-
- if (!np || !name) {
- pr_err("%s: not enough information provided\n", __func__);
- return NULL;
- }
-
- count = of_property_count_strings(np, "dma-names");
- if (count < 0) {
- pr_err("%s: dma-names property missing or empty\n", __func__);
- return NULL;
- }
-
- for (i = 0; i < count; i++) {
- if (of_dma_match_channel(np, name, i, &dma_spec))
- continue;
-
- ofdma = of_dma_get_controller(&dma_spec);
-
- if (!ofdma)
- continue;
-
- chan = ofdma->of_dma_xlate(&dma_spec, ofdma);
-
- of_dma_put_controller(ofdma);
-
- of_node_put(dma_spec.np);
-
- if (chan)
- return chan;
- }
-
- return NULL;
-}
-
-/**
- * of_dma_simple_xlate - Simple DMA engine translation function
- * @dma_spec: pointer to DMA specifier as found in the device tree
- * @of_dma: pointer to DMA controller data
- *
- * A simple translation function for devices that use a 32-bit value for the
- * filter_param when calling the DMA engine dma_request_channel() function.
- * Note that this translation function requires that #dma-cells is equal to 1
- * and the argument of the dma specifier is the 32-bit filter_param. Returns
- * pointer to appropriate dma channel on success or NULL on error.
- */
-struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec,
- struct of_dma *ofdma)
-{
- int count = dma_spec->args_count;
- struct of_dma_filter_info *info = ofdma->of_dma_data;
-
- if (!info || !info->filter_fn)
- return NULL;
-
- if (count != 1)
- return NULL;
-
- return dma_request_channel(info->dma_cap, info->filter_fn,
- &dma_spec->args[0]);
-}
-EXPORT_SYMBOL_GPL(of_dma_simple_xlate);
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff