*
*/
#define MAX_DMA_ADDRESS 0x20000000
-#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
+#define MAX_DMA_TRANSFER_SIZE 0x100000 /* Data Unit is half word */
/* according to the samsung port, we cannot use the regular
/* we have 4 dma channels */
-#define S3C2410_DMA_CHANNELS (4)
+#define S3C2410_DMA_CHANNELS (4)
+/* types */
+
+typedef enum {
+ S3C2410_DMA_IDLE,
+ S3C2410_DMA_RUNNING,
+ S3C2410_DMA_PAUSED
+} s3c2410_dma_state_t;
+
+
+/* s3c2410_dma_loadst_t
+ *
+ * This represents the state of the DMA engine, wrt to the loaded / running
+ * transfers. Since we don't have any way of knowing exactly the state of
+ * the DMA transfers, we need to know the state to make decisions on wether
+ * we can
+ *
+ * S3C2410_DMA_NONE
+ *
+ * There are no buffers loaded (the channel should be inactive)
+ *
+ * S3C2410_DMA_1LOADED
+ *
+ * There is one buffer loaded, however it has not been confirmed to be
+ * loaded by the DMA engine. This may be because the channel is not
+ * yet running, or the DMA driver decided that it was too costly to
+ * sit and wait for it to happen.
+ *
+ * S3C2410_DMA_1RUNNING
+ *
+ * The buffer has been confirmed running, and not finisged
+ *
+ * S3C2410_DMA_1LOADED_1RUNNING
+ *
+ * There is a buffer waiting to be loaded by the DMA engine, and one
+ * currently running.
+*/
+
+typedef enum {
+ S3C2410_DMALOAD_NONE,
+ S3C2410_DMALOAD_1LOADED,
+ S3C2410_DMALOAD_1RUNNING,
+ S3C2410_DMALOAD_1LOADED_1RUNNING,
+} s3c2410_dma_loadst_t;
+
+typedef enum {
+ S3C2410_RES_OK,
+ S3C2410_RES_ERR,
+ S3C2410_RES_ABORT
+} s3c2410_dma_buffresult_t;
+
+
+typedef enum s3c2410_dmasrc_e s3c2410_dmasrc_t;
+
+enum s3c2410_dmasrc_e {
+ S3C2410_DMASRC_HW, /* source is memory */
+ S3C2410_DMASRC_MEM /* source is hardware */
+};
+
+/* enum s3c2410_chan_op_e
+ *
+ * operation codes passed to the DMA code by the user, and also used
+ * to inform the current channel owner of any changes to the system state
+*/
+
+enum s3c2410_chan_op_e {
+ S3C2410_DMAOP_START,
+ S3C2410_DMAOP_STOP,
+ S3C2410_DMAOP_PAUSE,
+ S3C2410_DMAOP_RESUME,
+ S3C2410_DMAOP_FLUSH,
+ S3C2410_DMAOP_TIMEOUT, /* internal signal to handler */
+};
+
+typedef enum s3c2410_chan_op_e s3c2410_chan_op_t;
+
+/* flags */
+
+#define S3C2410_DMAF_SLOW (1<<0) /* slow, so don't worry about
+ * waiting for reloads */
+#define S3C2410_DMAF_AUTOSTART (1<<1) /* auto-start if buffer queued */
/* dma buffer */
typedef struct s3c2410_dma_buf_s s3c2410_dma_buf_t;
+struct s3c2410_dma_client {
+ char *name;
+};
+
+typedef struct s3c2410_dma_client s3c2410_dma_client_t;
+
+/* s3c2410_dma_buf_s
+ *
+ * internally used buffer structure to describe a queued or running
+ * buffer.
+*/
+
struct s3c2410_dma_buf_s {
s3c2410_dma_buf_t *next;
- int magic; /* magic */
- int size; /* buffer size in bytes */
- dma_addr_t data; /* start of DMA data */
- dma_addr_t ptr; /* where the DMA got to [1] */
- int ref;
- void *id; /* client's id */
- unsigned char no_callback; /* disable callback for buffer */
+ int magic; /* magic */
+ int size; /* buffer size in bytes */
+ dma_addr_t data; /* start of DMA data */
+ dma_addr_t ptr; /* where the DMA got to [1] */
+ void *id; /* client's id */
};
/* [1] is this updated for both recv/send modes? */
typedef struct s3c2410_dma_chan_s s3c2410_dma_chan_t;
-typedef void (*s3c2410_dma_cbfn_t)(s3c2410_dma_chan_t *, void *buf, int size);
-typedef void (*s3c2410_dma_enfn_t)(s3c2410_dma_chan_t *, int on);
-typedef void (*s3c2410_dma_pausefn_t)(s3c2410_dma_chan_t *, int on);
+/* s3c2410_dma_cbfn_t
+ *
+ * buffer callback routine type
+*/
+
+typedef void (*s3c2410_dma_cbfn_t)(s3c2410_dma_chan_t *, void *buf, int size,
+ s3c2410_dma_buffresult_t result);
+
+typedef int (*s3c2410_dma_opfn_t)(s3c2410_dma_chan_t *,
+ s3c2410_chan_op_t );
+
+struct s3c2410_dma_stats_s {
+ unsigned long loads;
+ unsigned long timeout_longest;
+ unsigned long timeout_shortest;
+ unsigned long timeout_avg;
+ unsigned long timeout_failed;
+};
+
+typedef struct s3c2410_dma_stats_s s3c2410_dma_stats_t;
+
+/* struct s3c2410_dma_chan_s
+ *
+ * full state information for each DMA channel
+*/
struct s3c2410_dma_chan_s {
- /* channel state flags */
- unsigned char number; /* number of this dma channel */
- unsigned char in_use; /* channel allocated */
- unsigned char started; /* channel has been started */
- unsigned char stopped; /* channel stopped */
- unsigned char sleeping;
- unsigned char xfer_unit; /* size of an transfer */
- unsigned char irq_claimed;
+ /* channel state flags and information */
+ unsigned char number; /* number of this dma channel */
+ unsigned char in_use; /* channel allocated */
+ unsigned char irq_claimed; /* irq claimed for channel */
+ unsigned char irq_enabled; /* irq enabled for channel */
+ unsigned char xfer_unit; /* size of an transfer */
+
+ /* channel state */
+
+ s3c2410_dma_state_t state;
+ s3c2410_dma_loadst_t load_state;
+ s3c2410_dma_client_t *client;
+
+ /* channel configuration */
+ s3c2410_dmasrc_t source;
+ unsigned long dev_addr;
+ unsigned long load_timeout;
+ unsigned int flags; /* channel flags */
/* channel's hardware position and configuration */
- unsigned long regs; /* channels registers */
- unsigned int irq; /* channel irq */
- unsigned long addr_reg; /* data address register for buffs */
- unsigned long dcon; /* default value of DCON */
+ unsigned long regs; /* channels registers */
+ unsigned int irq; /* channel irq */
+ unsigned long addr_reg; /* data address register */
+ unsigned long dcon; /* default value of DCON */
- /* driver handlers for channel */
- s3c2410_dma_cbfn_t callback_fn; /* callback function for buf-done */
- s3c2410_dma_enfn_t enable_fn; /* channel enable function */
- s3c2410_dma_pausefn_t pause_fn; /* channel pause function */
+ /* driver handles */
+ s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */
+ s3c2410_dma_opfn_t op_fn; /* channel operation callback */
- /* buffer list and information */
- s3c2410_dma_buf_t *curr; /* current dma buffer */
- s3c2410_dma_buf_t *next; /* next buffer to load */
- s3c2410_dma_buf_t *end; /* end of queue */
+ /* stats gathering */
+ s3c2410_dma_stats_t *stats;
+ s3c2410_dma_stats_t stats_store;
- int queue_count; /* number of items in queue */
- int loaded_count; /* number of loaded buffers */
+ /* buffer list and information */
+ s3c2410_dma_buf_t *curr; /* current dma buffer */
+ s3c2410_dma_buf_t *next; /* next buffer to load */
+ s3c2410_dma_buf_t *end; /* end of queue */
};
-/* note, we don't really use dma_deivce_t at the moment */
+/* the currently allocated channel information */
+extern s3c2410_dma_chan_t s3c2410_chans[];
+
+/* note, we don't really use dma_device_t at the moment */
typedef unsigned long dma_device_t;
-typedef enum s3c2410_dmasrc_e s3c2410_dmasrc_t;
+/* functions --------------------------------------------------------------- */
-/* these two defines control the source for the dma channel,
- * wether it is from memory or an device
+/* s3c2410_dma_request
+ *
+ * request a dma channel exclusivley
*/
-enum s3c2410_dmasrc_e {
- S3C2410_DMASRC_HW, /* source is memory */
- S3C2410_DMASRC_MEM /* source is hardware */
-};
+extern int s3c2410_dma_request(dmach_t channel,
+ s3c2410_dma_client_t *, void *dev);
+
+
+/* s3c2410_dma_ctrl
+ *
+ * change the state of the dma channel
+*/
+
+extern int s3c2410_dma_ctrl(dmach_t channel, s3c2410_chan_op_t op);
+
+/* s3c2410_dma_setflags
+ *
+ * set the channel's flags to a given state
+*/
-/* dma control routines */
+extern int s3c2410_dma_setflags(dmach_t channel,
+ unsigned int flags);
-extern int s3c2410_request_dma(dmach_t channel, const char *devid, void *dev);
-extern int s3c2410_free_dma(dmach_t channel);
-extern int s3c2410_dma_flush_all(dmach_t channel);
+/* s3c2410_dma_free
+ *
+ * free the dma channel (will also abort any outstanding operations)
+*/
-extern int s3c2410_dma_stop(dmach_t channel);
-extern int s3c2410_dma_resume(dmach_t channel);
+extern int s3c2410_dma_free(dmach_t channel, s3c2410_dma_client_t *);
-extern int s3c2410_dma_queue(dmach_t channel, void *id,
- dma_addr_t data, int size);
+/* s3c2410_dma_enqueue
+ *
+ * place the given buffer onto the queue of operations for the channel.
+ * The buffer must be allocated from dma coherent memory, or the Dcache/WB
+ * drained before the buffer is given to the DMA system.
+*/
-#define s3c2410_dma_queue_buffer s3c2410_dma_queue
+extern int s3c2410_dma_enqueue(dmach_t channel, void *id,
+ dma_addr_t data, int size);
-/* channel configuration */
+/* s3c2410_dma_config
+ *
+ * configure the dma channel
+*/
extern int s3c2410_dma_config(dmach_t channel, int xferunit, int dcon);
+/* s3c2410_dma_devconfig
+ *
+ * configure the device we're talking to
+*/
+
extern int s3c2410_dma_devconfig(int channel, s3c2410_dmasrc_t source,
int hwcfg, unsigned long devaddr);
-extern int s3c2410_dma_set_enablefn(dmach_t, s3c2410_dma_enfn_t rtn);
-extern int s3c2410_dma_set_pausefn(dmach_t, s3c2410_dma_pausefn_t rtn);
-extern int s3c2410_dma_set_callbackfn(dmach_t, s3c2410_dma_cbfn_t rtn);
+extern int s3c2410_dma_set_opfn(dmach_t, s3c2410_dma_opfn_t rtn);
+extern int s3c2410_dma_set_buffdone_fn(dmach_t, s3c2410_dma_cbfn_t rtn);
-#define s3c2410_dma_set_callback s3c2410_dma_set_callbackfn
+/* DMA Register definitions */
-#define S3C2410_DMA_DISRC (0x00)
-#define S3C2410_DMA_DISRCC (0x04)
-#define S3C2410_DMA_DIDST (0x08)
-#define S3C2410_DMA_DIDSTC (0x0C)
-#define S3C2410_DMA_DCON (0x10)
-#define S3C2410_DMA_DSTAT (0x14)
-#define S3C2410_DMA_DCSRC (0x18)
-#define S3C2410_DMA_DCDST (0x1C)
-#define S3C2410_DMA_DMASKTRIG (0x20)
+#define S3C2410_DMA_DISRC (0x00)
+#define S3C2410_DMA_DISRCC (0x04)
+#define S3C2410_DMA_DIDST (0x08)
+#define S3C2410_DMA_DIDSTC (0x0C)
+#define S3C2410_DMA_DCON (0x10)
+#define S3C2410_DMA_DSTAT (0x14)
+#define S3C2410_DMA_DCSRC (0x18)
+#define S3C2410_DMA_DCDST (0x1C)
+#define S3C2410_DMA_DMASKTRIG (0x20)
-#define S3C2410_DMASKTRIG_STOP (1<<2)
-#define S3C2410_DMASKTRIG_ON (1<<1)
+#define S3C2410_DMASKTRIG_STOP (1<<2)
+#define S3C2410_DMASKTRIG_ON (1<<1)
#define S3C2410_DMASKTRIG_SWTRIG (1<<0)
-#define S3C2410_DCOM_DEMAND (0<<31)
+#define S3C2410_DCOM_DEMAND (0<<31)
#define S3C2410_DCON_HANDSHAKE (1<<31)
#define S3C2410_DCON_SYNC_PCLK (0<<30)
#define S3C2410_DCON_SYNC_HCLK (1<<30)
-#define S3C2410_DCON_INTREQ (1<<29)
+#define S3C2410_DCON_INTREQ (1<<29)
-#define S3C2410_DCON_SRCSHIFT (24)
+#define S3C2410_DCON_SRCSHIFT (24)
-#define S3C2410_DCON_BYTE (0<<20)
-#define S3C2410_DCON_HALFWORD (1<<20)
-#define S3C2410_DCON_WORD (2<<20)
+#define S3C2410_DCON_BYTE (0<<20)
+#define S3C2410_DCON_HALFWORD (1<<20)
+#define S3C2410_DCON_WORD (2<<20)
#define S3C2410_DCON_AUTORELOAD (0<<22)
-#define S3C2410_DCON_HWTRIG (1<<23)
+#define S3C2410_DCON_NORELOAD (1<<22)
+#define S3C2410_DCON_HWTRIG (1<<23)
#endif /* __ASM_ARCH_DMA_H */
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