ufs: Add Support for Cadence platform UFS driver

Add Support for the platform driver for the Cadence device present on
TI's J721e device.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig
index b0981062d8a8218d27ff7ce9b2574d9ea9b46d55..c27207408252c4016a9715861e135c4e8a689c27 100644 (file)
--- a/drivers/ufs/Kconfig
+++ b/drivers/ufs/Kconfig
@@ -6,4 +6,12 @@ config UFS
        help
          This selects support for Universal Flash Subsystem (UFS).
          Say Y here if you want UFS Support.
+
+config CADENCE_UFS
+       bool "Cadence platform driver for UFS"
+       depends on UFS
+        help
+         This selects the platform driver for the Cadence UFS host
+         controller present on present TI's J721e devices.
+
 endmenu

diff --git a/drivers/ufs/Makefile b/drivers/ufs/Makefile
index b8df759f661be15c226d992e44248b967d15ce3a..9262bd6cd095fbf1d7e6c2949fbf31ed6cb5c6c5 100644 (file)
--- a/drivers/ufs/Makefile
+++ b/drivers/ufs/Makefile
@@ -4,3 +4,4 @@
 #
 
 obj-$(CONFIG_UFS) += ufs.o ufs-uclass.o
+obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o

diff --git a/drivers/ufs/cdns-platform.c b/drivers/ufs/cdns-platform.c
new file mode 100644 (file)
index 0000000..c80f425
--- /dev/null
+++ b/drivers/ufs/cdns-platform.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0+
+/**
+ * cdns-platform.c - Platform driver for Cadence UFSHCI device
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#include <clk.h>
+#include <common.h>
+#include <dm.h>
+#include <ufs.h>
+
+#include "ufs.h"
+
+#define USEC_PER_SEC   1000000L
+
+#define CDNS_UFS_REG_HCLKDIV   0xFC
+#define CDNS_UFS_REG_PHY_XCFGD1        0x113C
+
+static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
+                                       enum ufs_notify_change_status status)
+{
+       hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
+       switch (status) {
+       case PRE_CHANGE:
+               return ufshcd_dme_set(hba,
+                                     UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
+                                     0);
+       case POST_CHANGE:
+       ;
+       }
+
+       return 0;
+}
+
+static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
+{
+       struct clk clk;
+       unsigned long core_clk_rate = 0;
+       u32 core_clk_div = 0;
+       int ret;
+
+       ret = clk_get_by_name(hba->dev, "core_clk", &clk);
+       if (ret) {
+               dev_err(hba->dev, "failed to get core_clk clock\n");
+               return ret;
+       }
+
+       core_clk_rate = clk_get_rate(&clk);
+       if (IS_ERR_VALUE(core_clk_rate)) {
+               dev_err(hba->dev, "%s: unable to find core_clk rate\n",
+                       __func__);
+               return core_clk_rate;
+       }
+
+       core_clk_div = core_clk_rate / USEC_PER_SEC;
+       ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
+
+       return 0;
+}
+
+static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
+                                     enum ufs_notify_change_status status)
+{
+       switch (status) {
+       case PRE_CHANGE:
+               return cdns_ufs_set_hclkdiv(hba);
+       case POST_CHANGE:
+       ;
+       }
+
+       return 0;
+}
+
+static int cdns_ufs_init(struct ufs_hba *hba)
+{
+       u32 data;
+
+       /* Increase RX_Advanced_Min_ActivateTime_Capability */
+       data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
+       data |= BIT(24);
+       ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
+
+       return 0;
+}
+
+static struct ufs_hba_ops cdns_pltfm_hba_ops = {
+       .init = cdns_ufs_init,
+       .hce_enable_notify = cdns_ufs_hce_enable_notify,
+       .link_startup_notify = cdns_ufs_link_startup_notify,
+};
+
+static int cdns_ufs_pltfm_probe(struct udevice *dev)
+{
+       int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
+       if (err)
+               dev_err(dev, "ufshcd_probe() failed %d\n", err);
+
+       return err;
+}
+
+static int cdns_ufs_pltfm_bind(struct udevice *dev)
+{
+       struct udevice *scsi_dev;
+
+       return ufs_scsi_bind(dev, &scsi_dev);
+}
+
+static const struct udevice_id cdns_ufs_pltfm_ids[] = {
+       {
+               .compatible = "cdns,ufshc-m31-16nm",
+       },
+       {},
+};
+
+U_BOOT_DRIVER(cdns_ufs_pltfm) = {
+       .name           = "cdns-ufs-pltfm",
+       .id             =  UCLASS_UFS,
+       .of_match       = cdns_ufs_pltfm_ids,
+       .probe          = cdns_ufs_pltfm_probe,
+       .bind           = cdns_ufs_pltfm_bind,
+};