[PATCH v8 07/16] ARM: SAMSUNG: Add common DMA operations
Boojin Kim
boojin.kim at samsung.com
Thu Sep 1 20:44:35 EDT 2011
This patch adds common DMA operations which are used for Samsung DMA
drivers. Currently there are two types of DMA driver for Samsung SoCs.
The one is S3C-DMA for S3C SoCs and the other is PL330-DMA for S5P SoCs.
This patch provides funcion pointers for common DMA operations to DMA
client driver like SPI and Audio. It makes DMA client drivers support
multi-platform.
In addition, this common DMA operations implement the shared actions
that are needed for DMA client driver. For example shared actions are
filter() function for dma_request_channel() and parameter passing for
device_prep_slave_sg().
Signed-off-by: Boojin Kim <boojin.kim at samsung.com>
Acked-by: Linus Walleij <linus.walleij at linaro.org>
Acked-by: Vinod Koul <vinod.koul at intel.com>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
---
arch/arm/mach-s3c2410/include/mach/dma.h | 8 ++-
arch/arm/mach-s3c64xx/include/mach/dma.h | 4 +
arch/arm/plat-samsung/Makefile | 6 +-
arch/arm/plat-samsung/dma-ops.c | 131 +++++++++++++++++++++++
arch/arm/plat-samsung/include/plat/dma-ops.h | 63 +++++++++++
arch/arm/plat-samsung/include/plat/dma-pl330.h | 4 +
arch/arm/plat-samsung/include/plat/dma.h | 1 +
arch/arm/plat-samsung/s3c-dma-ops.c | 133 ++++++++++++++++++++++++
8 files changed, 347 insertions(+), 3 deletions(-)
create mode 100644 arch/arm/plat-samsung/dma-ops.c
create mode 100644 arch/arm/plat-samsung/include/plat/dma-ops.h
create mode 100644 arch/arm/plat-samsung/s3c-dma-ops.c
diff --git a/arch/arm/mach-s3c2410/include/mach/dma.h b/arch/arm/mach-s3c2410/include/mach/dma.h
index b2b2a5b..e61a91f 100644
--- a/arch/arm/mach-s3c2410/include/mach/dma.h
+++ b/arch/arm/mach-s3c2410/include/mach/dma.h
@@ -13,7 +13,6 @@
#ifndef __ASM_ARCH_DMA_H
#define __ASM_ARCH_DMA_H __FILE__
-#include <plat/dma.h>
#include <linux/sysdev.h>
#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
@@ -51,6 +50,13 @@ enum dma_ch {
DMACH_MAX, /* the end entry */
};
+static inline bool samsung_dma_is_dmadev(void)
+{
+ return false;
+}
+
+#include <plat/dma.h>
+
#define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
/* we have 4 dma channels */
diff --git a/arch/arm/mach-s3c64xx/include/mach/dma.h b/arch/arm/mach-s3c64xx/include/mach/dma.h
index 0a5d926..49c3a53 100644
--- a/arch/arm/mach-s3c64xx/include/mach/dma.h
+++ b/arch/arm/mach-s3c64xx/include/mach/dma.h
@@ -63,6 +63,10 @@ static __inline__ bool s3c_dma_has_circular(void)
return true;
}
+static inline bool samsung_dma_is_dmadev(void)
+{
+ return false;
+}
#define S3C2410_DMAF_CIRCULAR (1 << 0)
#include <plat/dma.h>
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 853764b..e2ee0b8 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -63,9 +63,11 @@ obj-$(CONFIG_SAMSUNG_DEV_BACKLIGHT) += dev-backlight.o
# DMA support
-obj-$(CONFIG_S3C_DMA) += dma.o
+obj-$(CONFIG_S3C_DMA) += dma.o s3c-dma-ops.o
-obj-$(CONFIG_S3C_PL330_DMA) += s3c-pl330.o
+obj-$(CONFIG_SAMSUNG_DMADEV) += dma-ops.o
+
+obj-$(CONFIG_S3C_PL330_DMA) += s3c-pl330.o s3c-dma-ops.o
# PM support
diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
new file mode 100644
index 0000000..6e3d9ab
--- /dev/null
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -0,0 +1,131 @@
+/* linux/arch/arm/plat-samsung/dma-ops.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Samsung DMA Operations
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/amba/pl330.h>
+#include <linux/scatterlist.h>
+
+#include <mach/dma.h>
+
+static inline bool pl330_filter(struct dma_chan *chan, void *param)
+{
+ struct dma_pl330_peri *peri = chan->private;
+ return peri->peri_id == (unsigned)param;
+}
+
+static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
+ struct samsung_dma_info *info)
+{
+ struct dma_chan *chan;
+ dma_cap_mask_t mask;
+ struct dma_slave_config slave_config;
+
+ dma_cap_zero(mask);
+ dma_cap_set(info->cap, mask);
+
+ chan = dma_request_channel(mask, pl330_filter, (void *)dma_ch);
+
+ if (info->direction == DMA_FROM_DEVICE) {
+ memset(&slave_config, 0, sizeof(struct dma_slave_config));
+ slave_config.direction = info->direction;
+ slave_config.src_addr = info->fifo;
+ slave_config.src_addr_width = info->width;
+ slave_config.src_maxburst = 1;
+ dmaengine_slave_config(chan, &slave_config);
+ } else if (info->direction == DMA_TO_DEVICE) {
+ memset(&slave_config, 0, sizeof(struct dma_slave_config));
+ slave_config.direction = info->direction;
+ slave_config.dst_addr = info->fifo;
+ slave_config.dst_addr_width = info->width;
+ slave_config.dst_maxburst = 1;
+ dmaengine_slave_config(chan, &slave_config);
+ }
+
+ return (unsigned)chan;
+}
+
+static int samsung_dmadev_release(unsigned ch,
+ struct s3c2410_dma_client *client)
+{
+ dma_release_channel((struct dma_chan *)ch);
+
+ return 0;
+}
+
+static int samsung_dmadev_prepare(unsigned ch,
+ struct samsung_dma_prep_info *info)
+{
+ struct scatterlist sg;
+ struct dma_chan *chan = (struct dma_chan *)ch;
+ struct dma_async_tx_descriptor *desc;
+
+ switch (info->cap) {
+ case DMA_SLAVE:
+ sg_init_table(&sg, 1);
+ sg_dma_len(&sg) = info->len;
+ sg_set_page(&sg, pfn_to_page(PFN_DOWN(info->buf)),
+ info->len, offset_in_page(info->buf));
+ sg_dma_address(&sg) = info->buf;
+
+ desc = chan->device->device_prep_slave_sg(chan,
+ &sg, 1, info->direction, DMA_PREP_INTERRUPT);
+ break;
+ case DMA_CYCLIC:
+ desc = chan->device->device_prep_dma_cyclic(chan,
+ info->buf, info->len, info->period, info->direction);
+ break;
+ default:
+ dev_err(&chan->dev->device, "unsupported format\n");
+ return -EFAULT;
+ }
+
+ if (!desc) {
+ dev_err(&chan->dev->device, "cannot prepare cyclic dma\n");
+ return -EFAULT;
+ }
+
+ desc->callback = info->fp;
+ desc->callback_param = info->fp_param;
+
+ dmaengine_submit((struct dma_async_tx_descriptor *)desc);
+
+ return 0;
+}
+
+static inline int samsung_dmadev_trigger(unsigned ch)
+{
+ dma_async_issue_pending((struct dma_chan *)ch);
+
+ return 0;
+}
+
+static inline int samsung_dmadev_flush(unsigned ch)
+{
+ return dmaengine_terminate_all((struct dma_chan *)ch);
+}
+
+struct samsung_dma_ops dmadev_ops = {
+ .request = samsung_dmadev_request,
+ .release = samsung_dmadev_release,
+ .prepare = samsung_dmadev_prepare,
+ .trigger = samsung_dmadev_trigger,
+ .started = NULL,
+ .flush = samsung_dmadev_flush,
+ .stop = samsung_dmadev_flush,
+};
+
+void *samsung_dmadev_get_ops(void)
+{
+ return &dmadev_ops;
+}
+EXPORT_SYMBOL(samsung_dmadev_get_ops);
diff --git a/arch/arm/plat-samsung/include/plat/dma-ops.h b/arch/arm/plat-samsung/include/plat/dma-ops.h
new file mode 100644
index 0000000..4c1a363
--- /dev/null
+++ b/arch/arm/plat-samsung/include/plat/dma-ops.h
@@ -0,0 +1,63 @@
+/* arch/arm/plat-samsung/include/plat/dma-ops.h
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Samsung DMA support
+ *
+ * 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 __SAMSUNG_DMA_OPS_H_
+#define __SAMSUNG_DMA_OPS_H_ __FILE__
+
+#include <linux/dmaengine.h>
+
+struct samsung_dma_prep_info {
+ enum dma_transaction_type cap;
+ enum dma_data_direction direction;
+ dma_addr_t buf;
+ unsigned long period;
+ unsigned long len;
+ void (*fp)(void *data);
+ void *fp_param;
+};
+
+struct samsung_dma_info {
+ enum dma_transaction_type cap;
+ enum dma_data_direction direction;
+ enum dma_slave_buswidth width;
+ dma_addr_t fifo;
+ struct s3c2410_dma_client *client;
+};
+
+struct samsung_dma_ops {
+ unsigned (*request)(enum dma_ch ch, struct samsung_dma_info *info);
+ int (*release)(unsigned ch, struct s3c2410_dma_client *client);
+ int (*prepare)(unsigned ch, struct samsung_dma_prep_info *info);
+ int (*trigger)(unsigned ch);
+ int (*started)(unsigned ch);
+ int (*flush)(unsigned ch);
+ int (*stop)(unsigned ch);
+};
+
+extern void *samsung_dmadev_get_ops(void);
+extern void *s3c_dma_get_ops(void);
+
+static inline void *__samsung_dma_get_ops(void)
+{
+ if (samsung_dma_is_dmadev())
+ return samsung_dmadev_get_ops();
+ else
+ return s3c_dma_get_ops();
+}
+
+/*
+ * samsung_dma_get_ops
+ * get the set of samsung dma operations
+ */
+#define samsung_dma_get_ops() __samsung_dma_get_ops()
+
+#endif /* __SAMSUNG_DMA_OPS_H_ */
diff --git a/arch/arm/plat-samsung/include/plat/dma-pl330.h b/arch/arm/plat-samsung/include/plat/dma-pl330.h
index 0a5dade..2916920 100644
--- a/arch/arm/plat-samsung/include/plat/dma-pl330.h
+++ b/arch/arm/plat-samsung/include/plat/dma-pl330.h
@@ -93,6 +93,10 @@ static inline bool s3c_dma_has_circular(void)
return true;
}
+static inline bool samsung_dma_is_dmadev(void)
+{
+ return true;
+}
#include <plat/dma.h>
#endif /* __DMA_PL330_H_ */
diff --git a/arch/arm/plat-samsung/include/plat/dma.h b/arch/arm/plat-samsung/include/plat/dma.h
index 8c273b7..3610760 100644
--- a/arch/arm/plat-samsung/include/plat/dma.h
+++ b/arch/arm/plat-samsung/include/plat/dma.h
@@ -126,3 +126,4 @@ extern int s3c2410_dma_set_opfn(enum dma_ch, s3c2410_dma_opfn_t rtn);
extern int s3c2410_dma_set_buffdone_fn(enum dma_ch, s3c2410_dma_cbfn_t rtn);
+#include <plat/dma-ops.h>
diff --git a/arch/arm/plat-samsung/s3c-dma-ops.c b/arch/arm/plat-samsung/s3c-dma-ops.c
new file mode 100644
index 0000000..33ab324
--- /dev/null
+++ b/arch/arm/plat-samsung/s3c-dma-ops.c
@@ -0,0 +1,133 @@
+/* linux/arch/arm/plat-samsung/s3c-dma-ops.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Samsung S3C-DMA Operations
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <mach/dma.h>
+
+struct cb_data {
+ void (*fp) (void *);
+ void *fp_param;
+ unsigned ch;
+ struct list_head node;
+};
+
+static LIST_HEAD(dma_list);
+
+static void s3c_dma_cb(struct s3c2410_dma_chan *channel, void *param,
+ int size, enum s3c2410_dma_buffresult res)
+{
+ struct cb_data *data = param;
+
+ data->fp(data->fp_param);
+}
+
+static unsigned s3c_dma_request(enum dma_ch dma_ch,
+ struct samsung_dma_info *info)
+{
+ struct cb_data *data;
+
+ if (s3c2410_dma_request(dma_ch, info->client, NULL) < 0) {
+ s3c2410_dma_free(dma_ch, info->client);
+ return 0;
+ }
+
+ data = kzalloc(sizeof(struct cb_data), GFP_KERNEL);
+ data->ch = dma_ch;
+ list_add_tail(&data->node, &dma_list);
+
+ if (info->direction == DMA_FROM_DEVICE)
+ s3c2410_dma_devconfig(dma_ch, S3C2410_DMASRC_HW, info->fifo);
+ else
+ s3c2410_dma_devconfig(dma_ch, S3C2410_DMASRC_MEM, info->fifo);
+
+ if (info->cap == DMA_CYCLIC)
+ s3c2410_dma_setflags(dma_ch, S3C2410_DMAF_CIRCULAR);
+
+ s3c2410_dma_config(dma_ch, info->width);
+
+ return (unsigned)dma_ch;
+}
+
+static int s3c_dma_release(unsigned ch, struct s3c2410_dma_client *client)
+{
+ struct cb_data *data;
+
+ list_for_each_entry(data, &dma_list, node)
+ if (data->ch == ch)
+ break;
+ list_del(&data->node);
+
+ s3c2410_dma_free(ch, client);
+ kfree(data);
+
+ return 0;
+}
+
+static int s3c_dma_prepare(unsigned ch, struct samsung_dma_prep_info *info)
+{
+ struct cb_data *data;
+ int len = (info->cap == DMA_CYCLIC) ? info->period : info->len;
+
+ list_for_each_entry(data, &dma_list, node)
+ if (data->ch == ch)
+ break;
+
+ if (!data->fp) {
+ s3c2410_dma_set_buffdone_fn(ch, s3c_dma_cb);
+ data->fp = info->fp;
+ data->fp_param = info->fp_param;
+ }
+
+ s3c2410_dma_enqueue(ch, (void *)data, info->buf, len);
+
+ return 0;
+}
+
+static inline int s3c_dma_trigger(unsigned ch)
+{
+ return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_START);
+}
+
+static inline int s3c_dma_started(unsigned ch)
+{
+ return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STARTED);
+}
+
+static inline int s3c_dma_flush(unsigned ch)
+{
+ return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_FLUSH);
+}
+
+static inline int s3c_dma_stop(unsigned ch)
+{
+ return s3c2410_dma_ctrl(ch, S3C2410_DMAOP_STOP);
+}
+
+static struct samsung_dma_ops s3c_dma_ops = {
+ .request = s3c_dma_request,
+ .release = s3c_dma_release,
+ .prepare = s3c_dma_prepare,
+ .trigger = s3c_dma_trigger,
+ .started = s3c_dma_started,
+ .flush = s3c_dma_flush,
+ .stop = s3c_dma_stop,
+};
+
+void *s3c_dma_get_ops(void)
+{
+ return &s3c_dma_ops;
+}
+EXPORT_SYMBOL(s3c_dma_get_ops);
--
1.7.1
More information about the linux-arm-kernel
mailing list