linux-kernel - [PATCH v1 1/1] mmc: sdhci-acpi: Add support for NVIDIA BlueField-3 SoC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <b62a68d1f8488e7f95befc6723ba5c20d6781628.1615487235.git.limings@nvidia.com>
Date:   Fri, 12 Mar 2021 08:48:25 -0500
From:   Liming Sun <limings@...dia.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Khalil Blaiech <kblaiech@...dia.com>
CC:     Liming Sun <limings@...dia.com>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 1/1] mmc: sdhci-acpi: Add support for NVIDIA BlueField-3 SoC

This commit adds ACPI support for the BlueField-3 SoC which uses
the DWC_mshc eMMC controller. The boundary check logic in static
function dwcmshc_adma_write_desc() comes from sdhci-of-dwcmshc.c.

Signed-off-by: Liming Sun <limings@...dia.com>
Reviewed-by: Khalil Blaiech <kblaiech@...dia.com>
---
 drivers/mmc/host/sdhci-acpi.c | 64 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 54205e3..6448e94e 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -716,6 +716,68 @@ static int sdhci_acpi_emmc_amd_probe_slot(struct platform_device *pdev,
 	.priv_size	= sizeof(struct amd_sdhci_host),
 };
 
+/* Check DMA address/length boundary. */
+static inline bool dwcmshc_adma_boundary_ok(dma_addr_t addr, int len)
+{
+	return (addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1));
+}
+
+/*
+ * If DMA addr spans 128MB boundary, we split the DMA transfer into two
+ * so that each DMA transfer doesn't exceed the boundary.
+ */
+static void dwcmshc_adma_write_desc(struct sdhci_host *host, void **desc,
+				    dma_addr_t addr, int len, unsigned int cmd)
+{
+	int tmplen, offset;
+
+	if (likely(!len || dwcmshc_adma_boundary_ok(addr, len))) {
+		sdhci_adma_write_desc(host, desc, addr, len, cmd);
+		return;
+	}
+
+	offset = addr & (SZ_128M - 1);
+	tmplen = SZ_128M - offset;
+	sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
+
+	addr += tmplen;
+	len -= tmplen;
+	sdhci_adma_write_desc(host, desc, addr, len, cmd);
+}
+
+static int sdhci_acpi_emmc_nvda_bf_probe_slot(struct platform_device *pdev,
+					      struct acpi_device *adev)
+{
+	struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
+	struct sdhci_host *host = c->host;
+	u32 extra;
+
+	/* Extra adma table cnt for cross 128M boundary handling. */
+	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M);
+	extra = min(extra, (u32)SDHCI_MAX_SEGS);
+	host->adma_table_cnt += extra;
+
+	return 0;
+}
+
+static const struct sdhci_ops sdhci_acpi_ops_nvda_bf = {
+	.set_clock		= sdhci_set_clock,
+	.set_bus_width		= sdhci_set_bus_width,
+	.set_uhs_signaling	= sdhci_set_uhs_signaling,
+	.reset			= sdhci_reset,
+	.adma_write_desc	= dwcmshc_adma_write_desc,
+};
+
+static const struct sdhci_acpi_chip sdhci_acpi_chip_nvda_bf = {
+	.ops = &sdhci_acpi_ops_nvda_bf,
+};
+
+static const struct sdhci_acpi_slot sdhci_acpi_slot_nvda_bf_emmc = {
+	.chip		= &sdhci_acpi_chip_nvda_bf,
+	.caps		= MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE,
+	.probe_slot	= sdhci_acpi_emmc_nvda_bf_probe_slot,
+};
+
 struct sdhci_acpi_uid_slot {
 	const char *hid;
 	const char *uid;
@@ -740,6 +802,7 @@ struct sdhci_acpi_uid_slot {
 	{ "QCOM8051", NULL, &sdhci_acpi_slot_qcom_sd_3v },
 	{ "QCOM8052", NULL, &sdhci_acpi_slot_qcom_sd },
 	{ "AMDI0040", NULL, &sdhci_acpi_slot_amd_emmc },
+	{ "MLNXBF30", NULL, &sdhci_acpi_slot_nvda_bf_emmc },
 	{ },
 };
 
@@ -757,6 +820,7 @@ struct sdhci_acpi_uid_slot {
 	{ "QCOM8051" },
 	{ "QCOM8052" },
 	{ "AMDI0040" },
+	{ "MLNXBF30" },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
-- 
1.8.3.1