@@ -18,6 +18,8 @@
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
#include "sdhci-pltfm.h"
#include "sdhci-xenon.h"
@@ -422,6 +424,7 @@ static int xenon_probe_params(struct platform_device *pdev)
struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
u32 sdhc_id, nr_sdhc;
u32 tuning_count;
+ struct sysinfo si;
/* Disable HS200 on Armada AP806 */
if (priv->hw_version == XENON_AP806)
@@ -450,6 +453,23 @@ static int xenon_probe_params(struct platform_device *pdev)
}
priv->tuning_count = tuning_count;
+ /*
+ * AC5/X/IM HW has only 31-bits passed in the crossbar switch.
+ * If we have more than 2GB of memory, this means we might pass
+ * memory pointers which are above 2GB and which cannot be properly
+ * represented. In this case, disable ADMA, 64-bit DMA and allow only SDMA.
+ * This effectively will enable bounce buffer quirk in the
+ * generic SDHCI driver, which will make sure DMA is only done
+ * from supported memory regions:
+ */
+ if (priv->hw_version == XENON_AC5) {
+ si_meminfo(&si);
+ if (si.totalram * si.mem_unit > SZ_2G) {
+ host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
+ host->quirks2 |= SDHCI_QUIRK2_BROKEN_64_BIT_DMA;
+ }
+ }
+
return xenon_phy_parse_params(dev, host);
}
@@ -562,6 +582,16 @@ static int xenon_probe(struct platform_device *pdev)
goto remove_sdhc;
pm_runtime_put_autosuspend(&pdev->dev);
+ /*
+ * If we previously detected AC5 with over 2GB of memory,
+ * then we disable ADMA and 64-bit DMA.
+ * This means generic SDHCI driver has set the DMA mask to
+ * 32-bit. Since DDR starts at 0x2_0000_0000, we must use
+ * 34-bit DMA mask to access this DDR memory:
+ */
+ if (priv->hw_version == XENON_AC5 &&
+ host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
+ dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
return 0;
@@ -680,6 +710,7 @@ static const struct of_device_id sdhci_xenon_dt_ids[] = {
{ .compatible = "marvell,armada-ap807-sdhci", .data = (void *)XENON_AP807},
{ .compatible = "marvell,armada-cp110-sdhci", .data = (void *)XENON_CP110},
{ .compatible = "marvell,armada-3700-sdhci", .data = (void *)XENON_A3700},
+ { .compatible = "marvell,ac5-sdhci", .data = (void *)XENON_AC5},
{}
};
MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
@@ -57,7 +57,8 @@ enum xenon_variant {
XENON_A3700,
XENON_AP806,
XENON_AP807,
- XENON_CP110
+ XENON_CP110,
+ XENON_AC5
};
struct xenon_priv {