sh: dma-api channel capability extensions.
This extends the SH DMA API for allowing handling of DMA
channels based off of their respective capabilities.
A couple of functions are added to the existing API,
the core bits are register_chan_caps() for registering
channel capabilities, and request_dma_bycap() for fetching
a channel dynamically based off of a capability set.
Signed-off-by: Mark Glaisher <mark.glaisher@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/dma.h b/include/asm-sh/dma.h
index d9daa02..faf3051 100644
--- a/include/asm-sh/dma.h
+++ b/include/asm-sh/dma.h
@@ -14,9 +14,7 @@
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/sysdev.h>
-#include <linux/device.h>
#include <asm/cpu/dma.h>
-#include <asm/semaphore.h>
/* The maximum address that we can perform a DMA transfer to on this platform */
/* Don't define MAX_DMA_ADDRESS; it's useless on the SuperH and any
@@ -46,16 +44,21 @@
* DMAC (dma_info) flags
*/
enum {
- DMAC_CHANNELS_CONFIGURED = 0x00,
- DMAC_CHANNELS_TEI_CAPABLE = 0x01,
+ DMAC_CHANNELS_CONFIGURED = 0x01,
+ DMAC_CHANNELS_TEI_CAPABLE = 0x02, /* Transfer end interrupt */
};
/*
* DMA channel capabilities / flags
*/
enum {
- DMA_TEI_CAPABLE = 0x01,
- DMA_CONFIGURED = 0x02,
+ DMA_CONFIGURED = 0x01,
+
+ /*
+ * Transfer end interrupt, inherited from DMAC.
+ * wait_queue used in dma_wait_for_completion.
+ */
+ DMA_TEI_CAPABLE = 0x02,
};
extern spinlock_t dma_spin_lock;
@@ -68,28 +71,31 @@
int (*get_residue)(struct dma_channel *chan);
int (*xfer)(struct dma_channel *chan);
- void (*configure)(struct dma_channel *chan, unsigned long flags);
+ int (*configure)(struct dma_channel *chan, unsigned long flags);
+ int (*extend)(struct dma_channel *chan, unsigned long op, void *param);
};
struct dma_channel {
- char dev_id[16];
+ char dev_id[16]; /* unique name per DMAC of channel */
- unsigned int chan; /* Physical channel number */
+ unsigned int chan; /* DMAC channel number */
unsigned int vchan; /* Virtual channel number */
+
unsigned int mode;
unsigned int count;
unsigned long sar;
unsigned long dar;
+ const char **caps;
+
unsigned long flags;
atomic_t busy;
- struct semaphore sem;
wait_queue_head_t wait_queue;
struct sys_device dev;
- char *name;
+ void *priv_data;
};
struct dma_info {
@@ -103,6 +109,12 @@
struct dma_channel *channels;
struct list_head list;
+ int first_channel_nr;
+};
+
+struct dma_chan_caps {
+ int ch_num;
+ const char **caplist;
};
#define to_dma_channel(channel) container_of(channel, struct dma_channel, dev)
@@ -121,6 +133,8 @@
#define dma_read_page(chan, from, to) \
dma_read(chan, from, to, PAGE_SIZE)
+extern int request_dma_bycap(const char **dmac, const char **caps,
+ const char *dev_id);
extern int request_dma(unsigned int chan, const char *dev_id);
extern void free_dma(unsigned int chan);
extern int get_dma_residue(unsigned int chan);
@@ -131,6 +145,10 @@
extern int register_dmac(struct dma_info *info);
extern void unregister_dmac(struct dma_info *info);
+extern struct dma_info *get_dma_info_by_name(const char *dmac_name);
+
+extern int dma_extend(unsigned int chan, unsigned long op, void *param);
+extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
#ifdef CONFIG_SYSFS
/* arch/sh/drivers/dma/dma-sysfs.c */