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authorGerald Baeza <gerald.baeza@stericsson.com>2012-09-21 21:21:37 +0200
committerFabio Baltieri <fabio.baltieri@linaro.org>2013-01-14 10:50:44 +0100
commit47db92f4a63499b1605b4c66f9347ba5479e7b19 (patch)
treea3e9510a1b3cec21147f11641f09bd984c2afb0a /drivers
parentf000df8c5a0e2002acc5989aad99a97d32a24718 (diff)
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dmaengine: ste_dma40: physical channels number correction
DMAC_ICFG[0:2]=SCHNB only allows to count 'multiple of 4' physical channels so it was ok with platforms having 8 channels but cannot be used for next versions (with 10 or 14 channels). This patch allows to provide the number of physical channels for a DMA device via platform_data, or still rely on SCHNB if platform_data announces 0 channel. Signed-off-by: Gerald Baeza <gerald.baeza@stericsson.com> Reviewed-by: Per Forlin <per.forlin@stericsson.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/dma/ste_dma40.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 5feab7db944..ca18117def0 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3004,14 +3004,21 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
* ? has revision 1
* DB8500v1 has revision 2
* DB8500v2 has revision 3
+ * AP9540v1 has revision 4
+ * DB8540v1 has revision 4
*/
rev = AMBA_REV_BITS(pid);
+ plat_data = pdev->dev.platform_data;
+
/* The number of physical channels on this HW */
- num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
+ if (plat_data->num_of_phy_chans)
+ num_phy_chans = plat_data->num_of_phy_chans;
+ else
+ num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
- dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n",
- rev, res->start);
+ dev_info(&pdev->dev, "hardware revision: %d @ 0x%x with %d physical channels\n",
+ rev, res->start, num_phy_chans);
if (rev < 2) {
d40_err(&pdev->dev, "hardware revision: %d is not supported",
@@ -3019,8 +3026,6 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
goto failure;
}
- plat_data = pdev->dev.platform_data;
-
/* Count the number of logical channels in use */
for (i = 0; i < plat_data->dev_len; i++)
if (plat_data->dev_rx[i] != 0)