This adds EHCI host support to the chipidea driver. We want it to be
part of the hdrc driver and not a standalone (sub-)driver module, as
the structure of ehci-hcd.c suggests, so for chipidea controller we
hack it to not provide platform-related code, but only the ehci hcd.
The ehci-platform driver won't work for us here too, because the
controller uses the same registers for both device and host mode and
also otg-related bits, so it's not really possible to put ehci registers
into a separate resource.
This is not a pretty solution, but the alternative is exporting symbols
from the chipidea driver to a ehci-chipidea driver and doing all the
module refcounting.
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/chipidea/Kconfig | 6 ++
drivers/usb/chipidea/Makefile | 1 +
drivers/usb/chipidea/ci.h | 9 ++-
drivers/usb/chipidea/core.c | 15 +++-
drivers/usb/chipidea/host.c | 170 +++++++++++++++++++++++++++++++++++++++++
drivers/usb/chipidea/host.h | 17 +++++
drivers/usb/chipidea/udc.c | 8 +-
drivers/usb/host/ehci-hcd.c | 8 ++
8 files changed, 225 insertions(+), 9 deletions(-)
create mode 100644 drivers/usb/chipidea/host.c
create mode 100644 drivers/usb/chipidea/host.h
diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index 553c197..8855000 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig
@@ -18,6 +18,12 @@ config USB_CHIPIDEA_UDC
Say Y here to enable device controller functionality of the
ChipIdea driver.
+config USB_CHIPIDEA_HOST
+ bool "ChipIdea device controller"
+ help
+ Say Y here to enable host controller functionality of the
+ ChipIdea driver.
+
config USB_CHIPIDEA_DEBUG
bool "ChipIdea driver debug"
help
diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index a8279aa..cc34937 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc.o
ci_hdrc-y := core.o
ci_hdrc-$(CONFIG_USB_CHIPIDEA_UDC) += udc.o
+ci_hdrc-$(CONFIG_USB_CHIPIDEA_HOST) += host.o
ci_hdrc-$(CONFIG_USB_CHIPIDEA_DEBUG) += debug.o
ifneq ($(CONFIG_PCI),)
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index 1ae25eb..e9774b6 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -17,6 +17,8 @@
#define __DRIVERS_USB_CHIPIDEA_CI_H
#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
#include <linux/usb/gadget.h>
#include "udc.h"
@@ -49,6 +51,7 @@ struct ci_role_driver {
/**
* struct hw_bank - hardware register mapping representation
* @lpm: set if the device is LPM capable
+ * @phys: physical address of the controller's registers
* @abs: absolute address of the beginning of register window
* @cap: capability registers
* @op: operational registers
@@ -57,6 +60,7 @@ struct ci_role_driver {
*/
struct hw_bank {
unsigned lpm;
+ resource_size_t phys;
void __iomem *abs;
void __iomem *cap;
void __iomem *op;
@@ -92,6 +96,7 @@ struct hw_bank {
* @udc_driver: platform specific information supplied by parent device
* @vbus_active: is VBUS active
* @transceiver: pointer to USB PHY, if any
+ * @hcd: pointer to usb_hcd for ehci host driver
*/
struct ci13xxx {
struct device *dev;
@@ -123,6 +128,7 @@ struct ci13xxx {
struct ci13xxx_udc_driver *udc_driver;
int vbus_active;
struct usb_phy *transceiver;
+ struct usb_hcd *hcd;
};
static inline struct ci_role_driver *ci_role(struct ci13xxx *ci)
@@ -197,6 +203,7 @@ enum ci13xxx_regs {
/* DCCPARAMS */
#define DCCPARAMS_DEN (0x1F << 0)
#define DCCPARAMS_DC BIT(7)
+#define DCCPARAMS_HC BIT(8)
/* TESTMODE */
#define TESTMODE_FORCE BIT(0)
@@ -338,7 +345,7 @@ static inline u32 hw_test_and_write(struct ci13xxx *udc, enum ci13xxx_regs reg,
return (val & mask) >> ffs_nr(mask);
}
-int hw_device_reset(struct ci13xxx *ci);
+int hw_device_reset(struct ci13xxx *ci, u32 mode);
int hw_port_test_set(struct ci13xxx *udc, u8 mode);
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 4f64711..fce3a35 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -69,6 +69,7 @@
#include "ci.h"
#include "udc.h"
+#include "host.h"
#include "debug.h"
/* Controller register map */
@@ -187,7 +188,7 @@ static int hw_device_init(struct ci13xxx *ci, void __iomem *base)
*
* This function returns an error code
*/
-int hw_device_reset(struct ci13xxx *ci)
+int hw_device_reset(struct ci13xxx *ci, u32 mode)
{
/* should flush & stop before reset */
hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
@@ -207,12 +208,12 @@ int hw_device_reset(struct ci13xxx *ci)
/* USBMODE should be configured step by step */
hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
- hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_DEVICE);
+ hw_write(ci, OP_USBMODE, USBMODE_CM, mode);
/* HW >= 2.3 */
hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
- if (hw_read(ci, OP_USBMODE, USBMODE_CM) != USBMODE_CM_DEVICE) {
- pr_err("cannot enter in device mode");
+ if (hw_read(ci, OP_USBMODE, USBMODE_CM) != mode) {
+ pr_err("cannot enter in %s mode", ci_role(ci)->name);
pr_err("lpm = %i", ci->hw_bank.lpm);
return -ENODEV;
}
@@ -343,6 +344,8 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
return -ENODEV;
}
+ ci->hw_bank.phys = res->start;
+
ci->irq = platform_get_irq(pdev, 0);
if (ci->irq < 0) {
dev_err(dev, "missing IRQ\n");
@@ -357,6 +360,10 @@ static int __devinit ci_hdrc_probe(struct platform_device *pdev)
}
/* initialize role(s) before the interrupt is requested */
+ ret = ci_hdrc_host_init(ci);
+ if (ret)
+ dev_info(dev, "doesn't support host\n");
+
ret = ci_hdrc_gadget_init(ci);
if (ret)
dev_info(dev, "doesn't support gadget\n");
diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
new file mode 100644
index 0000000..126753c
--- /dev/null
+++ b/drivers/usb/chipidea/host.c
@@ -0,0 +1,170 @@
+/*
+ * host.c - ChipIdea USB host controller driver
+ *
+ * Copyright (c) 2012 Intel Corporation
+ *
+ * Author: Alexander Shishkin
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/chipidea.h>
+
+#define CHIPIDEA_EHCI
+#include "../host/ehci-hcd.c"
+
+#include "ci.h"
+#include "host.h"
+
+static int ci_ehci_setup(struct usb_hcd *hcd)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ int ret;
+
+ ret = ehci_halt(ehci);
+ if (ret)
+ return ret;
+
+ ret = ehci_init(hcd);
+ if (ret)
+ return ret;
+
+ ehci_reset(ehci);
+
+ return ret;
+}
+
+static const struct hc_driver ci_ehci_hc_driver = {
+ .description = "ehci_hcd",
+ .product_desc = "ChipIdea HDRC EHCI",
+ .hcd_priv_size = sizeof(struct ehci_hcd),
+
+ /*
+ * generic hardware linkage
+ */
+ .irq = ehci_irq,
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /*
+ * basic lifecycle operations
+ */
+ .reset = ci_ehci_setup,
+ .start = ehci_run,
+ .stop = ehci_stop,
+ .shutdown = ehci_shutdown,
+
+ /*
+ * managing i/o requests and associated device resources
+ */
+ .urb_enqueue = ehci_urb_enqueue,
+ .urb_dequeue = ehci_urb_dequeue,
+ .endpoint_disable = ehci_endpoint_disable,
+ .endpoint_reset = ehci_endpoint_reset,
+
+ /*
+ * scheduling support
+ */
+ .get_frame_number = ehci_get_frame,
+
+ /*
+ * root hub support
+ */
+ .hub_status_data = ehci_hub_status_data,
+ .hub_control = ehci_hub_control,
+ .bus_suspend = ehci_bus_suspend,
+ .bus_resume = ehci_bus_resume,
+ .relinquish_port = ehci_relinquish_port,
+ .port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
+};
+
+static irqreturn_t host_irq(struct ci13xxx *ci)
+{
+ return usb_hcd_irq(ci->irq, ci->hcd);
+}
+
+static int host_start(struct ci13xxx *ci)
+{
+ struct usb_hcd *hcd;
+ struct ehci_hcd *ehci;
+ int ret;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ hcd = usb_create_hcd(&ci_ehci_hc_driver, ci->dev, dev_name(ci->dev));
+ if (!hcd)
+ return -ENOMEM;
+
+ dev_set_drvdata(ci->dev, ci);
+ hcd->rsrc_start = ci->hw_bank.phys;
+ hcd->rsrc_len = ci->hw_bank.size;
+ hcd->regs = ci->hw_bank.abs;
+ hcd->has_tt = 1;
+
+ ehci = hcd_to_ehci(hcd);
+ ehci->caps = ci->hw_bank.cap;
+ ehci->regs = ci->hw_bank.cap +
+ HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
+ ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+ ehci->has_hostpc = 1;
+ ehci->sbrn = 0x20;
+
+ ret = hw_device_reset(ci, USBMODE_CM_HOST);
+ if (ret)
+ goto rm_hcd;
+
+ ret = usb_add_hcd(hcd, 0, 0);
+ if (ret)
+ goto rm_hcd;
+
+ ci->hcd = hcd;
+
+ return ret;
+rm_hcd:
+ usb_remove_hcd(hcd);
+ return ret;
+}
+
+static void host_stop(struct ci13xxx *ci)
+{
+ struct usb_hcd *hcd = ci->hcd;
+
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+}
+
+int ci_hdrc_host_init(struct ci13xxx *ci)
+{
+ struct ci_role_driver *rdrv;
+
+ if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_HC))
+ return -ENXIO;
+
+ rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
+ if (!rdrv)
+ return -ENOMEM;
+
+ rdrv->start = host_start;
+ rdrv->stop = host_stop;
+ rdrv->irq = host_irq;
+ rdrv->name = "host";
+ ci->roles[CI_ROLE_HOST] = rdrv;
+
+ return 0;
+}
diff --git a/drivers/usb/chipidea/host.h b/drivers/usb/chipidea/host.h
new file mode 100644
index 0000000..761fb1f
--- /dev/null
+++ b/drivers/usb/chipidea/host.h
@@ -0,0 +1,17 @@
+#ifndef __DRIVERS_USB_CHIPIDEA_HOST_H
+#define __DRIVERS_USB_CHIPIDEA_HOST_H
+
+#ifdef CONFIG_USB_CHIPIDEA_HOST
+
+int ci_hdrc_host_init(struct ci13xxx *ci);
+
+#else
+
+static inline int ci_hdrc_host_init(struct ci13xxx *ci)
+{
+ return -ENXIO;
+}
+
+#endif
+
+#endif /* __DRIVERS_USB_CHIPIDEA_HOST_H */
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 53f4f1a..c9e648e 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1,5 +1,5 @@
/*
- * udc.h - ChipIdea UDC driver
+ * udc.c - ChipIdea UDC driver
*
* Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
*
@@ -1453,7 +1453,7 @@ static int ci13xxx_vbus_session(struct usb_gadget *_gadget, int is_active)
if (gadget_ready) {
if (is_active) {
pm_runtime_get_sync(&_gadget->dev);
- hw_device_reset(udc);
+ hw_device_reset(udc, USBMODE_CM_DEVICE);
hw_device_state(udc, udc->ep0out->qh.dma);
} else {
hw_device_state(udc, 0);
@@ -1602,7 +1602,7 @@ static int ci13xxx_start(struct usb_gadget *gadget,
if (udc->udc_driver->flags & CI13XXX_PULLUP_ON_VBUS) {
if (udc->vbus_active) {
if (udc->udc_driver->flags & CI13XXX_REGS_SHARED)
- hw_device_reset(udc);
+ hw_device_reset(udc, USBMODE_CM_DEVICE);
} else {
pm_runtime_put_sync(&udc->gadget.dev);
goto done;
@@ -1789,7 +1789,7 @@ static int udc_start(struct ci13xxx *udc)
}
if (!(udc->udc_driver->flags & CI13XXX_REGS_SHARED)) {
- retval = hw_device_reset(udc);
+ retval = hw_device_reset(udc, USBMODE_CM_DEVICE);
if (retval)
goto put_transceiver;
}
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index de1e689..5cb775b 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1246,6 +1246,13 @@ static int ehci_get_frame (struct usb_hcd *hcd)
}
/*-------------------------------------------------------------------------*/
+/*
+ * The EHCI in ChipIdea HDRC cannot be a separate module or device,
+ * because its registers (and irq) are shared between host/gadget/otg
+ * functions and in order to facilitate role switching we cannot
+ * give the ehci driver exclusive access to those.
+ */
+#ifndef CHIPIDEA_EHCI
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR (DRIVER_AUTHOR);
@@ -1504,3 +1511,4 @@ static void __exit ehci_hcd_cleanup(void)
}
module_exit(ehci_hcd_cleanup);
+#endif /* CHIPIDEA_EHCI */
--
1.7.10
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