[PATCH V2 2/2] scsi: ufshcd-intel-pci: Add PCI driver for Intel Host controllers

Adrian Hunter
2017-06-06T06:54:56Z

From: Szymon Mielczarek <szymonx.mielczarek@intel.com>

This patch adds a glue pci driver for Intel UFS Host controllers.

Signed-off-by: Szymon Mielczarek <szymonx.mielczarek@intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---

Changes in V2:

Change variant name from intel to intel-pci

drivers/scsi/ufs/Kconfig | 11 +++
drivers/scsi/ufs/Makefile | 1 +
drivers/scsi/ufs/ufshcd-intel-pci.c | 183 ++++++++++++++++++++++++++++++++++++
3 files changed, 195 insertions(+)
create mode 100644 drivers/scsi/ufs/ufshcd-intel-pci.c

diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index e27b4d4e6ae2..702420bc0fac 100644
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -69,6 +69,17 @@ config SCSI_UFS_DWC_TC_PCI

If unsure, say N.

+config SCSI_UFSHCD_INTEL_PCI
+ tristate "Intel PCI bus based UFS Controller support"
+ depends on SCSI_UFSHCD && PCI
+ ---help---
+ This selects the Intel PCI UFS Host Controller Interface. Select this if
+ you have Intel UFS Host Controller with PCI Interface.
+
+ If you have a controller with this interface, say Y or M here.
+
+ If unsure, say N.
+
config SCSI_UFSHCD_PLATFORM
tristate "Platform bus based UFS Controller support"
depends on SCSI_UFSHCD
diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
index 6e77cb0bfee9..be817e1a6666 100644
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-d
obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
+obj-$(CONFIG_SCSI_UFSHCD_INTEL_PCI) += ufshcd-intel-pci.o
obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
diff --git a/drivers/scsi/ufs/ufshcd-intel-pci.c b/drivers/scsi/ufs/ufshcd-intel-pci.c
new file mode 100644
index 000000000000..0b8dcce5ee3b
--- /dev/null
+++ b/drivers/scsi/ufs/ufshcd-intel-pci.c
@@ -0,0 +1,183 @@
+/*
+ * Universal Flash Storage Intel Host controller PCI driver
+ *
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include "ufshcd.h"
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+
+static int ufs_intel_disable_lcc(struct ufs_hba *hba)
+{
+ u32 attr = UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE);
+ u32 lcc_enable = 0;
+
+ ufshcd_dme_get(hba, attr, &lcc_enable);
+ if (lcc_enable)
+ ufshcd_dme_set(hba, attr, 0);
+
+ return 0;
+}
+
+static int ufs_intel_link_startup_notify(struct ufs_hba *hba,
+ enum ufs_notify_change_status status)
+{
+ int err = 0;
+
+ switch (status) {
+ case PRE_CHANGE:
+ err = ufs_intel_disable_lcc(hba);
+ break;
+ case POST_CHANGE:
+ break;
+ default:
+ break;
+ }
+
+ return err;
+}
+
+static struct ufs_hba_variant_ops ufs_intel_hba_vops = {
+ .name = "intel-pci",
+ .link_startup_notify = ufs_intel_link_startup_notify,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int ufs_intel_suspend(struct device *dev)
+{
+ return ufshcd_system_suspend(dev_get_drvdata(dev));
+}
+
+static int ufs_intel_resume(struct device *dev)
+{
+ return ufshcd_system_resume(dev_get_drvdata(dev));
+}
+#endif /* !CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static int ufs_intel_runtime_suspend(struct device *dev)
+{
+ return ufshcd_runtime_suspend(dev_get_drvdata(dev));
+}
+
+static int ufs_intel_runtime_resume(struct device *dev)
+{
+ return ufshcd_runtime_resume(dev_get_drvdata(dev));
+}
+
+static int ufs_intel_runtime_idle(struct device *dev)
+{
+ return ufshcd_runtime_idle(dev_get_drvdata(dev));
+}
+#endif /* !CONFIG_PM */
+
+static void ufs_intel_shutdown(struct pci_dev *pdev)
+{
+ ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev));
+}
+
+static void ufs_intel_remove(struct pci_dev *pdev)
+{
+ struct ufs_hba *hba = pci_get_drvdata(pdev);
+
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_noresume(&pdev->dev);
+ ufshcd_remove(hba);
+ ufshcd_dealloc_host(hba);
+}
+
+static int ufs_intel_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct ufs_hba *hba;
+ void __iomem *mmio_base;
+ int err;
+
+ dev_info(&pdev->dev, "UFS controller found [%04x:%04x]\n",
+ (int)pdev->vendor, (int)pdev->device);
+
+ err = pcim_enable_device(pdev);
+ if (err)
+ return err;
+
+ pci_set_master(pdev);
+
+ err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD);
+ if (err < 0)
+ return err;
+
+ mmio_base = pcim_iomap_table(pdev)[0];
+
+ err = ufshcd_alloc_host(&pdev->dev, &hba);
+ if (err)
+ return err;
+
+ hba->vops = &ufs_intel_hba_vops;
+
+ err = ufshcd_init(hba, mmio_base, pdev->irq);
+ if (err) {
+ dev_err(&pdev->dev, "Initialization failed\n");
+ goto out_dealloc;
+ }
+
+ pci_set_drvdata(pdev, hba);
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
+
+ return 0;
+
+out_dealloc:
+ ufshcd_dealloc_host(hba);
+ return err;
+}
+
+static const struct dev_pm_ops ufs_intel_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ufs_intel_suspend,
+ ufs_intel_resume)
+ SET_RUNTIME_PM_OPS(ufs_intel_runtime_suspend,
+ ufs_intel_runtime_resume,
+ ufs_intel_runtime_idle)
+};
+
+#define PCI_CLASS_STORAGE_UFSHCI 0x010901
+
+#define UFSHCD_INTEL_PCI_UFSHCI_DEVICE() { \
+ .vendor = PCI_VENDOR_ID_INTEL, \
+ .device = PCI_ANY_ID, \
+ .subvendor = PCI_ANY_ID, \
+ .subdevice = PCI_ANY_ID, \
+ .class = PCI_CLASS_STORAGE_UFSHCI, \
+ .class_mask = ~0, \
+}
+
+static const struct pci_device_id ufs_intel_tbl[] = {
+ UFSHCD_INTEL_PCI_UFSHCI_DEVICE(),
+ { } /* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, ufs_intel_tbl);
+
+static struct pci_driver ufs_intel_driver = {
+ .name = "ufshcd-intel-pci",
+ .id_table = ufs_intel_tbl,
+ .probe = ufs_intel_probe,
+ .remove = ufs_intel_remove,
+ .shutdown = ufs_intel_shutdown,
+ .driver = {
+ .pm = &ufs_intel_pm_ops
+ },
+};
+
+module_pci_driver(ufs_intel_driver);
+
+MODULE_AUTHOR("Szymon Mielczarek <szymonx.mielczarek@intel.com>");
+MODULE_DESCRIPTION("Intel UFS host controller PCI glue driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1