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DMAENGINE: ste_dma40: support older silicon

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This makes sure the DMA40 driver will also work on the oldest
silicon revisions that have the on-chip memory on another location
in the DB8500 and also requires explicit suspend before starting
or resuming a logical channel.

Signed-off-by: Linus Walleij <[email protected]>
[added parenthesis to the definition of U8500_DMA_LCPA_BASE_ED]
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Linus Walleij 2010-06-22 18:06:42 -07:00 • committed by Dan Williams
commit f41855929c
3 changed files with 31 additions and 4 deletions
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32
drivers/dma/ste_dma40.c
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@ -218,6 +218,7 @@ struct d40_chan {
* the same physical register.
* @dev: The device structure.
* @virtbase: The virtual base address of the DMA's register.
* @rev: silicon revision detected.
* @clk: Pointer to the DMA clock structure.
* @phy_start: Physical memory start of the DMA registers.
* @phy_size: Size of the DMA register map.
@ -250,6 +251,7 @@ struct d40_base {
spinlock_t execmd_lock;
struct device *dev;
void __iomem *virtbase;
u8 rev:4;
struct clk *clk;
phys_addr_t phy_start;
resource_size_t phy_size;
@ -757,6 +759,17 @@ static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
static int d40_start(struct d40_chan *d40c)
{
if (d40c->base->rev == 0) {
int err;
if (d40c->log_num != D40_PHY_CHAN) {
err = d40_channel_execute_command(d40c,
D40_DMA_SUSPEND_REQ);
if (err)
return err;
}
}
if (d40c->log_num != D40_PHY_CHAN)
d40_config_set_event(d40c, true);
@ -1426,6 +1439,13 @@ static int d40_resume(struct dma_chan *chan)
spin_lock_irqsave(&d40c->lock, flags);
if (d40c->base->rev == 0)
if (d40c->log_num != D40_PHY_CHAN) {
res = d40_channel_execute_command(d40c,
D40_DMA_SUSPEND_REQ);
goto no_suspend;
}
/* If bytes left to transfer or linked tx resume job */
if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
if (d40c->log_num != D40_PHY_CHAN)
@ -1433,6 +1453,7 @@ static int d40_resume(struct dma_chan *chan)
res = d40_channel_execute_command(d40c, D40_DMA_RUN);
}
no_suspend:
spin_unlock_irqrestore(&d40c->lock, flags);
return res;
}
@ -2286,6 +2307,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
int num_log_chans = 0;
int num_phy_chans;
int i;
u32 val;
clk = clk_get(&pdev->dev, NULL);
@ -2324,12 +2346,13 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
}
}
i = readl(virtbase + D40_DREG_PERIPHID2);
/* Get silicon revision */
val = readl(virtbase + D40_DREG_PERIPHID2);
if ((i & 0xf) != D40_PERIPHID2_DESIGNER) {
if ((val & 0xf) != D40_PERIPHID2_DESIGNER) {
dev_err(&pdev->dev,
"[%s] Unknown designer! Got %x wanted %x\n",
__func__, i & 0xf, D40_PERIPHID2_DESIGNER);
__func__, val & 0xf, D40_PERIPHID2_DESIGNER);
goto failure;
}
@ -2337,7 +2360,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n",
(i >> 4) & 0xf, res->start);
(val >> 4) & 0xf, res->start);
plat_data = pdev->dev.platform_data;
@ -2359,6 +2382,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
goto failure;
}
base->rev = (val >> 4) & 0xf;
base->clk = clk;
base->num_phy_chans = num_phy_chans;
base->num_log_chans = num_log_chans;