[PATCH v11 5/6] mmc: sdhci-tegra: Add support to program MC stream ID

[Thierry Reding <thierry.reding@gmail.com>]

From: Prathamesh Shete <pshete@nvidia.com>

SMMU clients are supposed to program stream ID from
their respective address spaces instead of MC override.
Define NVQUIRK_PROGRAM_STREAMID and use it to program
SMMU stream ID from the SDMMC client address space.

Signed-off-by: Aniruddha TVS Rao <anrao@nvidia.com>
Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index bbe2bc238171..1cb7fd3afa7e 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/bitops.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
@@ -11,6 +12,7 @@
 #include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/iommu.h>
 #include <linux/iopoll.h>
 #include <linux/ktime.h>
 #include <linux/mmc/card.h>
@@ -96,6 +98,8 @@
 #define SDHCI_TEGRA_AUTO_CAL_STATUS			0x1ec
 #define SDHCI_TEGRA_AUTO_CAL_ACTIVE			BIT(31)
 
+#define SDHCI_TEGRA_CIF2AXI_CTRL_0			0x1fc
+
 #define NVQUIRK_FORCE_SDHCI_SPEC_200			BIT(0)
 #define NVQUIRK_ENABLE_BLOCK_GAP_DET			BIT(1)
 #define NVQUIRK_ENABLE_SDHCI_SPEC_300			BIT(2)
@@ -123,6 +127,7 @@
 #define NVQUIRK_HAS_TMCLK				BIT(10)
 
 #define NVQUIRK_HAS_ANDROID_GPT_SECTOR			BIT(11)
+#define NVQUIRK_PROGRAM_STREAMID			BIT(12)
 
 /* SDMMC CQE Base Address for Tegra Host Ver 4.1 and Higher */
 #define SDHCI_TEGRA_CQE_BASE_ADDR			0xF000
@@ -179,6 +184,7 @@ struct sdhci_tegra {
 	bool enable_hwcq;
 	unsigned long curr_clk_rate;
 	u8 tuned_tap_delay;
+	u32 stream_id;
 };
 
 static u16 tegra_sdhci_readw(struct sdhci_host *host, int reg)
@@ -1566,6 +1572,7 @@ static const struct sdhci_tegra_soc_data soc_data_tegra234 = {
 		    NVQUIRK_DIS_CARD_CLK_CONFIG_TAP |
 		    NVQUIRK_ENABLE_SDR50 |
 		    NVQUIRK_ENABLE_SDR104 |
+		    NVQUIRK_PROGRAM_STREAMID |
 		    NVQUIRK_HAS_TMCLK,
 	.min_tap_delay = 95,
 	.max_tap_delay = 111,
@@ -1632,6 +1639,19 @@ static int sdhci_tegra_add_host(struct sdhci_host *host)
 	return ret;
 }
 
+/* Program MC streamID for DMA transfers */
+static void sdhci_tegra_program_stream_id(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host);
+
+	if (tegra_host->soc_data->nvquirks & NVQUIRK_PROGRAM_STREAMID) {
+		tegra_sdhci_writel(host, FIELD_PREP(GENMASK(15, 8), tegra_host->stream_id) |
+					 FIELD_PREP(GENMASK( 7, 0), tegra_host->stream_id),
+					 SDHCI_TEGRA_CIF2AXI_CTRL_0);
+	}
+}
+
 static int sdhci_tegra_probe(struct platform_device *pdev)
 {
 	const struct sdhci_tegra_soc_data *soc_data;
@@ -1692,6 +1712,12 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
 
 	tegra_sdhci_parse_dt(host);
 
+	if (tegra_host->soc_data->nvquirks & NVQUIRK_PROGRAM_STREAMID &&
+	    !tegra_dev_iommu_get_stream_id(&pdev->dev, &tegra_host->stream_id)) {
+		dev_warn(mmc_dev(host->mmc), "missing IOMMU stream ID\n");
+		tegra_host->stream_id = 0x7f;
+	}
+
 	tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power",
 							 GPIOD_OUT_HIGH);
 	if (IS_ERR(tegra_host->power_gpio)) {
@@ -1777,6 +1803,8 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
 	if (rc)
 		goto err_add_host;
 
+	sdhci_tegra_program_stream_id(host);
+
 	return 0;
 
 err_add_host:
@@ -1873,6 +1901,8 @@ static int sdhci_tegra_resume(struct device *dev)
 	if (ret)
 		return ret;
 
+	sdhci_tegra_program_stream_id(host);
+
 	ret = sdhci_resume_host(host);
 	if (ret)
 		goto disable_clk;
-- 
2.38.1