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ARM: OMAP: Sync DMA with linux-omap tree 

This patch syncs OMAP DMA code with linux-omap tree.
Mostly allow changing DMA callback function and set
OMAP2 specific transfer mode.

Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2006-09-25 12:45:45 +03:00
parent ddc32a8749
commit 709eb3e5cc
2 changed files with 75 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
arch/arm/plat-omap/dma.c
View File

@ -119,11 +119,12 @@ static void clear_lch_regs(int lch)
omap_writew(0, lch_base + i);
}
void omap_set_dma_priority(int dst_port, int priority)
void omap_set_dma_priority(int lch, int dst_port, int priority)
{
unsigned long reg;
u32 l;
if (cpu_class_is_omap1()) {
switch (dst_port) {
case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
reg = OMAP_TC_OCPT1_PRIOR;
@ -145,6 +146,14 @@ void omap_set_dma_priority(int dst_port, int priority)
l &= ~(0xf << 8);
l |= (priority & 0xf) << 8;
omap_writel(l, reg);
}
if (cpu_is_omap24xx()) {
if (priority)
OMAP_DMA_CCR_REG(lch) |= (1 << 6);
else
OMAP_DMA_CCR_REG(lch) &= ~(1 << 6);
}
}
void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
@ -234,6 +243,14 @@ void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
OMAP1_DMA_LCH_CTRL_REG(lch) = w;
}
void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
{
if (cpu_is_omap24xx()) {
OMAP_DMA_CSDP_REG(lch) &= ~(0x3 << 16);
OMAP_DMA_CSDP_REG(lch) |= (mode << 16);
}
}
/* Note that src_port is only for omap1 */
void omap_set_dma_src_params(int lch, int src_port, int src_amode,
unsigned long src_start,
@ -697,6 +714,32 @@ void omap_stop_dma(int lch)
dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
}
/*
* Allows changing the DMA callback function or data. This may be needed if
* the driver shares a single DMA channel for multiple dma triggers.
*/
int omap_set_dma_callback(int lch,
void (* callback)(int lch, u16 ch_status, void *data),
void *data)
{
unsigned long flags;
if (lch < 0)
return -ENODEV;
spin_lock_irqsave(&dma_chan_lock, flags);
if (dma_chan[lch].dev_id == -1) {
printk(KERN_ERR "DMA callback for not set for free channel\n");
spin_unlock_irqrestore(&dma_chan_lock, flags);
return -EINVAL;
}
dma_chan[lch].callback = callback;
dma_chan[lch].data = data;
spin_unlock_irqrestore(&dma_chan_lock, flags);
return 0;
}
/*
* Returns current physical source address for the given DMA channel.
* If the channel is running the caller must disable interrupts prior calling

12
include/asm-arm/arch-omap/dma.h
View File

@ -331,6 +331,12 @@ enum omap_dma_color_mode {
OMAP_DMA_TRANSPARENT_COPY
};
enum omap_dma_write_mode {
OMAP_DMA_WRITE_NON_POSTED = 0,
OMAP_DMA_WRITE_POSTED,
OMAP_DMA_WRITE_LAST_NON_POSTED
};
struct omap_dma_channel_params {
int data_type; /* data type 8,16,32 */
int elem_count; /* number of elements in a frame */
@ -356,7 +362,7 @@ struct omap_dma_channel_params {
};
extern void omap_set_dma_priority(int dst_port, int priority);
extern void omap_set_dma_priority(int lch, int dst_port, int priority);
extern int omap_request_dma(int dev_id, const char *dev_name,
void (* callback)(int lch, u16 ch_status, void *data),
void *data, int *dma_ch);
@ -371,6 +377,7 @@ extern void omap_set_dma_transfer_params(int lch, int data_type,
int dma_trigger, int src_or_dst_synch);
extern void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode,
u32 color);
extern void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode);
extern void omap_set_dma_src_params(int lch, int src_port, int src_amode,
unsigned long src_start,
@ -394,6 +401,9 @@ extern void omap_set_dma_params(int lch,
extern void omap_dma_link_lch (int lch_head, int lch_queue);
extern void omap_dma_unlink_lch (int lch_head, int lch_queue);
extern int omap_set_dma_callback(int lch,
void (* callback)(int lch, u16 ch_status, void *data),
void *data);
extern dma_addr_t omap_get_dma_src_pos(int lch);
extern dma_addr_t omap_get_dma_dst_pos(int lch);
extern int omap_get_dma_src_addr_counter(int lch);