diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-xenon.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-xenon.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c index 25ba7aecc3be..0e52867f6e91 100644 --- a/drivers/mmc/host/sdhci-xenon.c +++ b/drivers/mmc/host/sdhci-xenon.c @@ -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); |