This patch adds AMBA glue driver for ufshcd
Signed-off-by: Vinayak Holikatti <[email protected]>
Signed-off-by: Santosh Yaraganavi <[email protected]>
---
drivers/scsi/ufs/Kconfig | 10 ++
drivers/scsi/ufs/Makefile | 1 +
drivers/scsi/ufs/ufshcd-amba.c | 180 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 191 insertions(+), 0 deletions(-)
create mode 100644 drivers/scsi/ufs/ufshcd-amba.c
diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index 8c06330..0ad4658 100644
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -78,3 +78,13 @@ config SCSI_UFSHCD_PLATFORM
If you have a controller with this interface, say Y or M here.
If unsure, say N.
+
+config SCSI_UFSHCD_AMBA
+ tristate "AMBA bus based UFS Controller support"
+ depends on SCSI_UFSHCD && ARM_AMBA
+ ---help---
+ This selects the ARM(R) AMBA(R) PrimeCell UFS Host Controller
+ Interface support. If you have an ARM(R) platform with
+ UFS Host Controller, say Y or M here.
+
+ If unsure, say N.
diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
index 1e5bd48..a27330f 100644
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -2,3 +2,4 @@
obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
+obj-$(CONFIG_SCSI_UFSHCD_AMBA) += ufshcd-amba.o
diff --git a/drivers/scsi/ufs/ufshcd-amba.c b/drivers/scsi/ufs/ufshcd-amba.c
new file mode 100644
index 0000000..d4647e4
--- /dev/null
+++ b/drivers/scsi/ufs/ufshcd-amba.c
@@ -0,0 +1,180 @@
+/*
+ * Universal Flash Storage Host controller driver
+ *
+ * This code is based on drivers/scsi/ufs/ufshcd-amba.c
+ * Copyright (C) 2011-2012 Samsung India Software Operations
+ *
+ * Santosh Yaraganavi <[email protected]>
+ * Vinayak Holikatti <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * NO WARRANTY
+ * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
+ * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
+ * solely responsible for determining the appropriateness of using and
+ * distributing the Program and assumes all risks associated with its
+ * exercise of rights under this Agreement, including but not limited to
+ * the risks and costs of program errors, damage to or loss of data,
+ * programs or equipment, and unavailability or interruption of operations.
+
+ * DISCLAIMER OF LIABILITY
+ * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
+ * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
+ */
+
+#include "ufshcd.h"
+#include "ufshcd_common.h"
+#include <linux/amba/bus.h>
+
+/**
+ * ufshcd_amba_probe - probe routine of the driver
+ * @dev: pointer to amba device handle
+ * @id: amba device id
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_amba_probe(struct amba_device *dev, const struct amba_id *id)
+{
+ void __iomem *mmio_base;
+ struct ufs_hba *hba;
+ int err;
+
+ err = amba_request_regions(dev, UFSHCD);
+ if (err < 0) {
+ dev_err(&dev->dev, "request regions failed\n");
+ goto out_error;
+ }
+
+ mmio_base = ioremap_nocache(dev->res.start, resource_size(&dev->res));
+ if (!mmio_base) {
+ pr_err("memory map failed\n");
+ err = -ENOMEM;
+ goto out_release_regions;
+ }
+
+ err = ufshcd_init(&dev->dev, &hba, mmio_base, dev->irq[0]);
+ if (err) {
+ dev_err(&dev->dev, "%s:%d-%s Initialization failed\n",
+ __FILE__, __LINE__, __func__);
+ goto out_iounmap;
+ }
+
+ amba_set_drvdata(dev, hba);
+
+ return 0;
+
+out_iounmap:
+ iounmap(mmio_base);
+out_release_regions:
+ amba_release_regions(dev);
+out_error:
+ return err;
+}
+
+static int ufshcd_amba_remove(struct amba_device *dev)
+{
+ struct ufs_hba *hba = amba_get_drvdata(dev);
+
+ ufshcd_remove(hba);
+ free_irq(dev->irq[0], hba);
+ amba_release_regions(dev);
+ amba_set_drvdata(dev, NULL);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+/**
+ * ufshcd_amba_suspend - suspend power management function
+ * @dev: pointer to amba device handle
+ * @state: power state
+ *
+ * Returns -ENOSYS
+ */
+static int ufshcd_amba_suspend(struct amba_device *dev, pm_message_t state)
+{
+ /*
+ * TODO:
+ * 1. Block SCSI requests from SCSI midlayer
+ * 2. Change the internal driver state to non operational
+ * 3. Set UTRLRSR and UTMRLRSR bits to zero
+ * 4. Wait until outstanding commands are completed
+ * 5. Set HCE to zero to send the UFS host controller to reset state
+ */
+
+ return -ENOSYS;
+}
+
+/**
+ * ufshcd_amba_resume - resume power management function
+ * @dev: pointer to amba device handle
+ *
+ * Returns -ENOSYS
+ */
+static int ufshcd_amba_resume(struct amba_device *dev)
+{
+ /*
+ * TODO:
+ * 1. Set HCE to 1, to start the UFS host controller
+ * initialization process
+ * 2. Set UTRLRSR and UTMRLRSR bits to 1
+ * 3. Change the internal driver state to operational
+ * 4. Unblock SCSI requests from SCSI midlayer
+ */
+
+
+ return -ENOSYS;
+}
+#endif
+
+static struct amba_id ufshcd_amba_ids[] = {
+ {
+ /* Fake id for Primecell.*/
+ .id = 0x00041FF0,
+ .mask = 0x000fffff,
+ },
+ { 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, ufshcd_amba_ids);
+
+static struct amba_driver ufshcd_amba_driver = {
+ .drv = {
+ .name = "ufshcd",
+ },
+ .id_table = ufshcd_amba_ids,
+ .probe = ufshcd_amba_probe,
+ .remove = ufshcd_amba_remove,
+#ifdef CONFIG_PM
+ .suspend = ufshcd_amba_suspend,
+ .resume = ufshcd_amba_resume,
+#endif
+};
+
+module_amba_driver(ufshcd_amba_driver);
+
+MODULE_AUTHOR("Santosh Yaragnavi <[email protected]>");
+MODULE_AUTHOR("Vinayak Holikatti <[email protected]>");
+MODULE_DESCRIPTION("AMBA based UFS host controller driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(UFSHCD_DRIVER_VERSION);
--
1.7.5.4
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