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Subject[RFC PATCH v2 06/15] usb:cdns3: Adds Host support
Date
Patch adds host-export.h and host.c file and mplements functions that
allow to initialize, start and stop XHCI host driver.

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
drivers/usb/cdns3/Kconfig | 10 ++
drivers/usb/cdns3/Makefile | 1 +
drivers/usb/cdns3/core.c | 7 +-
drivers/usb/cdns3/host-export.h | 30 ++++
drivers/usb/cdns3/host.c | 256 ++++++++++++++++++++++++++++++++
5 files changed, 302 insertions(+), 2 deletions(-)
create mode 100644 drivers/usb/cdns3/host-export.h
create mode 100644 drivers/usb/cdns3/host.c

diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index eb22a8692991..d92bc3d68eb0 100644
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -10,6 +10,16 @@ config USB_CDNS3

if USB_CDNS3

+config USB_CDNS3_HOST
+ bool "Cadence USB3 host controller"
+ depends on USB_XHCI_HCD
+ help
+ Say Y here to enable host controller functionality of the
+ cadence driver.
+
+ Host controller is compliance with XHCI so it will use
+ standard XHCI driver.
+
config USB_CDNS3_PCI_WRAP
tristate "PCIe-based Platforms"
depends on USB_PCI && ACPI
diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index e779b2a2f8eb..976117ba67ff 100644
--- a/drivers/usb/cdns3/Makefile
+++ b/drivers/usb/cdns3/Makefile
@@ -2,4 +2,5 @@ obj-$(CONFIG_USB_CDNS3) += cdns3.o
obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci.o

cdns3-y := core.o drd.o
+cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o
cdns3-pci-y := cdns3-pci-wrap.o
diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index dbee4325da7f..4cb820be9ff3 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -17,6 +17,7 @@

#include "gadget.h"
#include "core.h"
+#include "host-export.h"
#include "drd.h"

static inline struct cdns3_role_driver *cdns3_get_current_role_driver(struct cdns3 *cdns)
@@ -98,7 +99,8 @@ static int cdns3_core_init_role(struct cdns3 *cdns)
}

if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
- //TODO: implements host initialization
+ if (cdns3_host_init(cdns))
+ dev_info(dev, "doesn't support host\n");
}

if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
@@ -142,7 +144,7 @@ static irqreturn_t cdns3_irq(int irq, void *data)

static void cdns3_remove_roles(struct cdns3 *cdns)
{
- //TODO: implements this function
+ cdns3_host_remove(cdns);
}

static int cdns3_do_role_switch(struct cdns3 *cdns, enum cdns3_roles role)
@@ -410,6 +412,7 @@ static struct platform_driver cdns3_driver = {

static int __init cdns3_driver_platform_register(void)
{
+ cdns3_host_driver_init();
return platform_driver_register(&cdns3_driver);
}
module_init(cdns3_driver_platform_register);
diff --git a/drivers/usb/cdns3/host-export.h b/drivers/usb/cdns3/host-export.h
new file mode 100644
index 000000000000..f8f3b230b472
--- /dev/null
+++ b/drivers/usb/cdns3/host-export.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Cadence USBSS DRD Driver -Host Export APIs
+ *
+ * Copyright (C) 2017 NXP
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ */
+#ifndef __LINUX_CDNS3_HOST_EXPORT
+#define __LINUX_CDNS3_HOST_EXPORT
+
+#ifdef CONFIG_USB_CDNS3_HOST
+
+int cdns3_host_init(struct cdns3 *cdns);
+void cdns3_host_remove(struct cdns3 *cdns);
+void cdns3_host_driver_init(void);
+
+#else
+
+static inline int cdns3_host_init(struct cdns3 *cdns)
+{
+ return -ENXIO;
+}
+
+static inline void cdns3_host_remove(struct cdns3 *cdns) { }
+static inline void cdns3_host_driver_init(void) {}
+
+#endif /* CONFIG_USB_CDNS3_HOST */
+
+#endif /* __LINUX_CDNS3_HOST_EXPORT */
diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
new file mode 100644
index 000000000000..0dd47976cb28
--- /dev/null
+++ b/drivers/usb/cdns3/host.c
@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS DRD Driver - host side
+ *
+ * Copyright (C) 2018 Cadence Design Systems.
+ * Copyright (C) 2018 NXP
+ *
+ * Authors: Peter Chen <peter.chen@nxp.com>
+ * Pawel Laszczak <pawell@cadence.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/pm_runtime.h>
+#include <linux/usb/of.h>
+
+#include "../host/xhci.h"
+#include "core.h"
+#include "host-export.h"
+
+static struct hc_driver __read_mostly xhci_cdns3_hc_driver;
+
+static void xhci_cdns3_quirks(struct device *dev, struct xhci_hcd *xhci)
+{
+ /*
+ * As of now platform drivers don't provide MSI support so we ensure
+ * here that the generic code does not try to make a pci_dev from our
+ * dev struct in order to setup MSI
+ */
+ xhci->quirks |= XHCI_PLAT;
+}
+
+static int xhci_cdns3_setup(struct usb_hcd *hcd)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ u32 command;
+ int ret;
+
+ ret = xhci_gen_setup(hcd, xhci_cdns3_quirks);
+ if (ret)
+ return ret;
+
+ /* set usbcmd.EU3S */
+ command = readl(&xhci->op_regs->command);
+ command |= CMD_PM_INDEX;
+ writel(command, &xhci->op_regs->command);
+
+ return 0;
+}
+
+static const struct xhci_driver_overrides xhci_cdns3_overrides __initconst = {
+ .extra_priv_size = sizeof(struct xhci_hcd),
+ .reset = xhci_cdns3_setup,
+};
+
+struct cdns3_host {
+ struct device dev;
+ struct usb_hcd *hcd;
+};
+
+static irqreturn_t cdns3_host_irq(struct cdns3 *cdns)
+{
+ struct device *dev = cdns->host_dev;
+ struct usb_hcd *hcd;
+
+ if (dev)
+ hcd = dev_get_drvdata(dev);
+ else
+ return IRQ_NONE;
+
+ if (hcd)
+ return usb_hcd_irq(cdns->irq, hcd);
+ else
+ return IRQ_NONE;
+}
+
+static void cdns3_host_release(struct device *dev)
+{
+ struct cdns3_host *host = container_of(dev, struct cdns3_host, dev);
+
+ kfree(host);
+}
+
+static int cdns3_host_start(struct cdns3 *cdns)
+{
+ struct cdns3_host *host;
+ struct device *dev;
+ struct device *sysdev;
+ struct xhci_hcd *xhci;
+ int ret;
+
+ host = kzalloc(sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return -ENOMEM;
+
+ dev = &host->dev;
+ dev->release = cdns3_host_release;
+ dev->parent = cdns->dev;
+ dev_set_name(dev, "xhci-cdns3");
+ cdns->host_dev = dev;
+ ret = device_register(dev);
+ if (ret)
+ goto err1;
+
+ sysdev = cdns->dev;
+ /* Try to set 64-bit DMA first */
+ if (WARN_ON(!sysdev->dma_mask))
+ /* Platform did not initialize dma_mask */
+ ret = dma_coerce_mask_and_coherent(sysdev,
+ DMA_BIT_MASK(64));
+ else
+ ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(64));
+
+ /* If setting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
+ if (ret) {
+ ret = dma_set_mask_and_coherent(sysdev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_no_callbacks(dev);
+ pm_runtime_enable(dev);
+ host->hcd = __usb_create_hcd(&xhci_cdns3_hc_driver, sysdev, dev,
+ dev_name(dev), NULL);
+ if (!host->hcd) {
+ ret = -ENOMEM;
+ goto err2;
+ }
+
+ host->hcd->regs = cdns->xhci_regs;
+ host->hcd->rsrc_start = cdns->xhci_res->start;
+ host->hcd->rsrc_len = resource_size(cdns->xhci_res);
+
+ device_wakeup_enable(host->hcd->self.controller);
+ xhci = hcd_to_xhci(host->hcd);
+
+ xhci->main_hcd = host->hcd;
+ xhci->shared_hcd = __usb_create_hcd(&xhci_cdns3_hc_driver, sysdev, dev,
+ dev_name(dev), host->hcd);
+ if (!xhci->shared_hcd) {
+ ret = -ENOMEM;
+ goto err3;
+ }
+
+ host->hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node);
+ xhci->shared_hcd->tpl_support = host->hcd->tpl_support;
+ ret = usb_add_hcd(host->hcd, 0, IRQF_SHARED);
+ if (ret)
+ goto err4;
+
+ ret = usb_add_hcd(xhci->shared_hcd, 0, IRQF_SHARED);
+ if (ret)
+ goto err5;
+
+ device_set_wakeup_capable(dev, true);
+
+ return 0;
+
+err5:
+ usb_remove_hcd(host->hcd);
+err4:
+ usb_put_hcd(xhci->shared_hcd);
+err3:
+ usb_put_hcd(host->hcd);
+err2:
+ device_del(dev);
+err1:
+ put_device(dev);
+ cdns->host_dev = NULL;
+ return ret;
+}
+
+static void cdns3_host_stop(struct cdns3 *cdns)
+{
+ struct device *dev = cdns->host_dev;
+ struct xhci_hcd *xhci;
+ struct usb_hcd *hcd;
+
+ if (dev) {
+ hcd = dev_get_drvdata(dev);
+ xhci = hcd_to_xhci(hcd);
+ usb_remove_hcd(xhci->shared_hcd);
+ usb_remove_hcd(hcd);
+ synchronize_irq(cdns->irq);
+ usb_put_hcd(xhci->shared_hcd);
+ usb_put_hcd(hcd);
+ cdns->host_dev = NULL;
+ pm_runtime_set_suspended(dev);
+ pm_runtime_disable(dev);
+ device_del(dev);
+ put_device(dev);
+ }
+}
+
+#if CONFIG_PM
+static int cdns3_host_suspend(struct cdns3 *cdns, bool do_wakeup)
+{
+ struct device *dev = cdns->host_dev;
+ struct xhci_hcd *xhci;
+
+ if (!dev)
+ return 0;
+
+ xhci = hcd_to_xhci(dev_get_drvdata(dev));
+ return xhci_suspend(xhci, do_wakeup);
+}
+
+static int cdns3_host_resume(struct cdns3 *cdns, bool hibernated)
+{
+ struct device *dev = cdns->host_dev;
+ struct xhci_hcd *xhci;
+
+ if (!dev)
+ return 0;
+
+ xhci = hcd_to_xhci(dev_get_drvdata(dev));
+ return xhci_resume(xhci, hibernated);
+}
+#endif /* CONFIG_PM */
+
+int cdns3_host_init(struct cdns3 *cdns)
+{
+ struct cdns3_role_driver *rdrv;
+
+ rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
+ if (!rdrv)
+ return -ENOMEM;
+
+ rdrv->start = cdns3_host_start;
+ rdrv->stop = cdns3_host_stop;
+ rdrv->irq = cdns3_host_irq;
+#if CONFIG_PM
+ rdrv->suspend = cdns3_host_suspend;
+ rdrv->resume = cdns3_host_resume;
+#endif /* CONFIG_PM */
+ rdrv->name = "host";
+ cdns->roles[CDNS3_ROLE_HOST] = rdrv;
+
+ return 0;
+}
+
+void cdns3_host_remove(struct cdns3 *cdns)
+{
+ cdns3_host_stop(cdns);
+}
+
+void __init cdns3_host_driver_init(void)
+{
+ xhci_init_driver(&xhci_cdns3_hc_driver, &xhci_cdns3_overrides);
+}
--
2.17.1
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