mmc: sdhci-tegra: Add support to program MC stream ID

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>
Link: https://lore.kernel.org/r/20221206165945.3551774-6-thierry.reding@gmail.com
[Ulf: Fixed a checkpatch error]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index f3f5a4a..fbe3a2e 100644 (file)
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2010 Google, Inc.
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
@@ -10,6 +11,7 @@
 #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>
@@ -95,6 +97,8 @@
 #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)
@@ -122,6 +126,7 @@
 #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
@@ -178,6 +183,7 @@ 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)
@@ -1561,6 +1567,7 @@ 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,
@@ -1627,6 +1634,19 @@ cleanup:
        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;
@@ -1687,6 +1707,12 @@ 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)) {
@@ -1772,6 +1798,8 @@ 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:
@@ -1868,6 +1896,8 @@ 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;