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dma40: allow realtime and priority for event lines 

DB8500v2's DMA40 (revision 3) allows setting event lines as high priority and
real time.

Acked-by: Per Forlin <per.forlin@stericsson.com>
Acked-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Rabin Vincent 2011-01-25 11:18:11 +01:00 committed by Dan Williams
parent 4d5949009e
commit ac2c0a3871
3 changed files with 53 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/plat-nomadik/include/plat/ste_dma40.h
View File

@ -104,6 +104,8 @@ struct stedma40_half_channel_info {
*
* @dir: MEM 2 MEM, PERIPH 2 MEM , MEM 2 PERIPH, PERIPH 2 PERIPH
* @high_priority: true if high-priority
* @realtime: true if realtime mode is to be enabled. Only available on DMA40
* version 3+, i.e DB8500v2+
* @mode: channel mode: physical, logical, or operation
* @mode_opt: options for the chosen channel mode
* @src_dev_type: Src device type
@ -119,6 +121,7 @@ struct stedma40_half_channel_info {
struct stedma40_chan_cfg {
enum stedma40_xfer_dir dir;
bool high_priority;
bool realtime;
enum stedma40_mode mode;
enum stedma40_mode_opt mode_opt;
int src_dev_type;

34
drivers/dma/ste_dma40.c
View File

@ -1724,6 +1724,38 @@ bool stedma40_filter(struct dma_chan *chan, void *data)
}
EXPORT_SYMBOL(stedma40_filter);
static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
{
bool realtime = d40c->dma_cfg.realtime;
bool highprio = d40c->dma_cfg.high_priority;
u32 prioreg = highprio ? D40_DREG_PSEG1 : D40_DREG_PCEG1;
u32 rtreg = realtime ? D40_DREG_RSEG1 : D40_DREG_RCEG1;
u32 event = D40_TYPE_TO_EVENT(dev_type);
u32 group = D40_TYPE_TO_GROUP(dev_type);
u32 bit = 1 << event;
/* Destination event lines are stored in the upper halfword */
if (!src)
bit <<= 16;
writel(bit, d40c->base->virtbase + prioreg + group * 4);
writel(bit, d40c->base->virtbase + rtreg + group * 4);
}
static void d40_set_prio_realtime(struct d40_chan *d40c)
{
if (d40c->base->rev < 3)
return;
if ((d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) ||
(d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
__d40_set_prio_rt(d40c, d40c->dma_cfg.src_dev_type, true);
if ((d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH) ||
(d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_PERIPH))
__d40_set_prio_rt(d40c, d40c->dma_cfg.dst_dev_type, false);
}
/* DMA ENGINE functions */
static int d40_alloc_chan_resources(struct dma_chan *chan)
{
@ -1756,6 +1788,8 @@ static int d40_alloc_chan_resources(struct dma_chan *chan)
d40_phy_cfg(&d40c->dma_cfg, &d40c->src_def_cfg,
&d40c->dst_def_cfg, chan_is_logical(d40c));
d40_set_prio_realtime(d40c);
if (chan_is_logical(d40c)) {
d40_log_cfg(&d40c->dma_cfg,
&d40c->log_def.lcsp1, &d40c->log_def.lcsp3);

16
drivers/dma/ste_dma40_ll.h
View File

@ -163,6 +163,22 @@
#define D40_DREG_LCEIS1 0x0B4
#define D40_DREG_LCEIS2 0x0B8
#define D40_DREG_LCEIS3 0x0BC
#define D40_DREG_PSEG1 0x110
#define D40_DREG_PSEG2 0x114
#define D40_DREG_PSEG3 0x118
#define D40_DREG_PSEG4 0x11C
#define D40_DREG_PCEG1 0x120
#define D40_DREG_PCEG2 0x124
#define D40_DREG_PCEG3 0x128
#define D40_DREG_PCEG4 0x12C
#define D40_DREG_RSEG1 0x130
#define D40_DREG_RSEG2 0x134
#define D40_DREG_RSEG3 0x138
#define D40_DREG_RSEG4 0x13C
#define D40_DREG_RCEG1 0x140
#define D40_DREG_RCEG2 0x144
#define D40_DREG_RCEG3 0x148
#define D40_DREG_RCEG4 0x14C
#define D40_DREG_STFU 0xFC8
#define D40_DREG_ICFG 0xFCC
#define D40_DREG_PERIPHID0 0xFE0