USB: Driver for Freescale QUICC Engine USB Host Controller

This patch adds support for the FHCI USB controller, as found
in the Freescale MPC836x and MPC832x processors. It can support
Full or Low speed modes.

Quite a lot the hardware is doing by itself (SOF generation, CRC
generation and checking), though scheduling and retransmission is on
software's shoulders.

This controller does not integrate the root hub, so this driver also
fakes one-port hub. External hub is required to support more than
one device.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 345 insertions, 0 deletions

diff --git a/drivers/usb/host/fhci-hub.c b/drivers/usb/host/fhci-hub.c
new file mode 100644
index 00000000000..0cfaedc3e12
--- /dev/null
+++ b/drivers/usb/host/fhci-hub.c
@@ -0,0 +1,345 @@
+/*
+ * Freescale QUICC Engine USB Host Controller Driver
+ *
+ * Copyright (c) Freescale Semicondutor, Inc. 2006.
+ *               Shlomi Gridish <gridish@freescale.com>
+ *               Jerry Huang <Chang-Ming.Huang@freescale.com>
+ * Copyright (c) Logic Product Development, Inc. 2007
+ *               Peter Barada <peterb@logicpd.com>
+ * Copyright (c) MontaVista Software, Inc. 2008.
+ *               Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/usb.h>
+#include <linux/gpio.h>
+#include <asm/qe.h>
+#include "../core/hcd.h"
+#include "fhci.h"
+
+/* virtual root hub specific descriptor */
+static u8 root_hub_des[] = {
+	0x09, /* blength */
+	0x29, /* bDescriptorType;hub-descriptor */
+	0x01, /* bNbrPorts */
+	0x00, /* wHubCharacteristics */
+	0x00,
+	0x01, /* bPwrOn2pwrGood;2ms */
+	0x00, /* bHubContrCurrent;0mA */
+	0x00, /* DeviceRemoveable */
+	0xff, /* PortPwrCtrlMask */
+};
+
+static void fhci_gpio_set_value(struct fhci_hcd *fhci, int gpio_nr, bool on)
+{
+	int gpio = fhci->gpios[gpio_nr];
+	bool alow = fhci->alow_gpios[gpio_nr];
+
+	if (!gpio_is_valid(gpio))
+		return;
+
+	gpio_set_value(gpio, on ^ alow);
+	mdelay(5);
+}
+
+void fhci_config_transceiver(struct fhci_hcd *fhci,
+			     enum fhci_port_status status)
+{
+	fhci_dbg(fhci, "-> %s: %d\n", __func__, status);
+
+	switch (status) {
+	case FHCI_PORT_POWER_OFF:
+		fhci_gpio_set_value(fhci, GPIO_POWER, false);
+		break;
+	case FHCI_PORT_DISABLED:
+	case FHCI_PORT_WAITING:
+		fhci_gpio_set_value(fhci, GPIO_POWER, true);
+		break;
+	case FHCI_PORT_LOW:
+		fhci_gpio_set_value(fhci, GPIO_SPEED, false);
+		break;
+	case FHCI_PORT_FULL:
+		fhci_gpio_set_value(fhci, GPIO_SPEED, true);
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+
+	fhci_dbg(fhci, "<- %s: %d\n", __func__, status);
+}
+
+/* disable the USB port by clearing the EN bit in the USBMOD register */
+void fhci_port_disable(struct fhci_hcd *fhci)
+{
+	struct fhci_usb *usb = (struct fhci_usb *)fhci->usb_lld;
+	enum fhci_port_status port_status;
+
+	fhci_dbg(fhci, "-> %s\n", __func__);
+
+	fhci_stop_sof_timer(fhci);
+
+	fhci_flush_all_transmissions(usb);
+
+	fhci_usb_disable_interrupt((struct fhci_usb *)fhci->usb_lld);
+	port_status = usb->port_status;
+	usb->port_status = FHCI_PORT_DISABLED;
+
+	/* Enable IDLE since we want to know if something comes along */
+	usb->saved_msk |= USB_E_IDLE_MASK;
+	out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
+
+	/* check if during the disconnection process attached new device */
+	if (port_status == FHCI_PORT_WAITING)
+		fhci_device_connected_interrupt(fhci);
+	usb->vroot_hub->port.wPortStatus &= ~USB_PORT_STAT_ENABLE;
+	usb->vroot_hub->port.wPortChange |= USB_PORT_STAT_C_ENABLE;
+	fhci_usb_enable_interrupt((struct fhci_usb *)fhci->usb_lld);
+
+	fhci_dbg(fhci, "<- %s\n", __func__);
+}
+
+/* enable the USB port by setting the EN bit in the USBMOD register */
+void fhci_port_enable(void *lld)
+{
+	struct fhci_usb *usb = (struct fhci_usb *)lld;
+	struct fhci_hcd *fhci = usb->fhci;
+
+	fhci_dbg(fhci, "-> %s\n", __func__);
+
+	fhci_config_transceiver(fhci, usb->port_status);
+
+	if ((usb->port_status != FHCI_PORT_FULL) &&
+			(usb->port_status != FHCI_PORT_LOW))
+		fhci_start_sof_timer(fhci);
+
+	usb->vroot_hub->port.wPortStatus |= USB_PORT_STAT_ENABLE;
+	usb->vroot_hub->port.wPortChange |= USB_PORT_STAT_C_ENABLE;
+
+	fhci_dbg(fhci, "<- %s\n", __func__);
+}
+
+void fhci_io_port_generate_reset(struct fhci_hcd *fhci)
+{
+	fhci_dbg(fhci, "-> %s\n", __func__);
+
+	gpio_direction_output(fhci->gpios[GPIO_USBOE], 0);
+	gpio_direction_output(fhci->gpios[GPIO_USBTP], 0);
+	gpio_direction_output(fhci->gpios[GPIO_USBTN], 0);
+
+	mdelay(5);
+
+	qe_pin_set_dedicated(fhci->pins[PIN_USBOE]);
+	qe_pin_set_dedicated(fhci->pins[PIN_USBTP]);
+	qe_pin_set_dedicated(fhci->pins[PIN_USBTN]);
+
+	fhci_dbg(fhci, "<- %s\n", __func__);
+}
+
+/* generate the RESET condition on the bus */
+void fhci_port_reset(void *lld)
+{
+	struct fhci_usb *usb = (struct fhci_usb *)lld;
+	struct fhci_hcd *fhci = usb->fhci;
+	u8 mode;
+	u16 mask;
+
+	fhci_dbg(fhci, "-> %s\n", __func__);
+
+	fhci_stop_sof_timer(fhci);
+	/* disable the USB controller */
+	mode = in_8(&fhci->regs->usb_mod);
+	out_8(&fhci->regs->usb_mod, mode & (~USB_MODE_EN));
+
+	/* disable idle interrupts */
+	mask = in_be16(&fhci->regs->usb_mask);
+	out_be16(&fhci->regs->usb_mask, mask & (~USB_E_IDLE_MASK));
+
+	fhci_io_port_generate_reset(fhci);
+
+	/* enable interrupt on this endpoint */
+	out_be16(&fhci->regs->usb_mask, mask);
+
+	/* enable the USB controller */
+	mode = in_8(&fhci->regs->usb_mod);
+	out_8(&fhci->regs->usb_mod, mode | USB_MODE_EN);
+	fhci_start_sof_timer(fhci);
+
+	fhci_dbg(fhci, "<- %s\n", __func__);
+}
+
+int fhci_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
+	int ret = 0;
+	unsigned long flags;
+
+	fhci_dbg(fhci, "-> %s\n", __func__);
+
+	spin_lock_irqsave(&fhci->lock, flags);
+
+	if (fhci->vroot_hub->port.wPortChange & (USB_PORT_STAT_C_CONNECTION |
+			USB_PORT_STAT_C_ENABLE | USB_PORT_STAT_C_SUSPEND |
+			USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_OVERCURRENT)) {
+		*buf = 1 << 1;
+		ret = 1;
+		fhci_dbg(fhci, "-- %s\n", __func__);
+	}
+
+	spin_unlock_irqrestore(&fhci->lock, flags);
+
+	fhci_dbg(fhci, "<- %s\n", __func__);
+
+	return ret;
+}
+
+int fhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
+			    u16 wIndex, char *buf, u16 wLength)
+{
+	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
+	int retval = 0;
+	int len = 0;
+	struct usb_hub_status *hub_status;
+	struct usb_port_status *port_status;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fhci->lock, flags);
+
+	fhci_dbg(fhci, "-> %s\n", __func__);
+
+	switch (typeReq) {
+	case ClearHubFeature:
+		switch (wValue) {
+		case C_HUB_LOCAL_POWER:
+		case C_HUB_OVER_CURRENT:
+			break;
+		default:
+			goto error;
+		}
+		break;
+	case ClearPortFeature:
+		fhci->vroot_hub->feature &= (1 << wValue);
+
+		switch (wValue) {
+		case USB_PORT_FEAT_ENABLE:
+			fhci->vroot_hub->port.wPortStatus &=
+			    ~USB_PORT_STAT_ENABLE;
+			fhci_port_disable(fhci);
+			break;
+		case USB_PORT_FEAT_C_ENABLE:
+			fhci->vroot_hub->port.wPortChange &=
+			    ~USB_PORT_STAT_C_ENABLE;
+			break;
+		case USB_PORT_FEAT_SUSPEND:
+			fhci->vroot_hub->port.wPortStatus &=
+			    ~USB_PORT_STAT_SUSPEND;
+			fhci_stop_sof_timer(fhci);
+			break;
+		case USB_PORT_FEAT_C_SUSPEND:
+			fhci->vroot_hub->port.wPortChange &=
+			    ~USB_PORT_STAT_C_SUSPEND;
+			break;
+		case USB_PORT_FEAT_POWER:
+			fhci->vroot_hub->port.wPortStatus &=
+			    ~USB_PORT_STAT_POWER;
+			fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
+			break;
+		case USB_PORT_FEAT_C_CONNECTION:
+			fhci->vroot_hub->port.wPortChange &=
+			    ~USB_PORT_STAT_C_CONNECTION;
+			break;
+		case USB_PORT_FEAT_C_OVER_CURRENT:
+			fhci->vroot_hub->port.wPortChange &=
+			    ~USB_PORT_STAT_C_OVERCURRENT;
+			break;
+		case USB_PORT_FEAT_C_RESET:
+			fhci->vroot_hub->port.wPortChange &=
+			    ~USB_PORT_STAT_C_RESET;
+			break;
+		default:
+			goto error;
+		}
+		break;
+	case GetHubDescriptor:
+		memcpy(buf, root_hub_des, sizeof(root_hub_des));
+		buf[3] = 0x11; /* per-port power, no ovrcrnt */
+		len = (buf[0] < wLength) ? buf[0] : wLength;
+		break;
+	case GetHubStatus:
+		hub_status = (struct usb_hub_status *)buf;
+		hub_status->wHubStatus =
+		    cpu_to_le16(fhci->vroot_hub->hub.wHubStatus);
+		hub_status->wHubChange =
+		    cpu_to_le16(fhci->vroot_hub->hub.wHubChange);
+		len = 4;
+		break;
+	case GetPortStatus:
+		port_status = (struct usb_port_status *)buf;
+		port_status->wPortStatus =
+		    cpu_to_le16(fhci->vroot_hub->port.wPortStatus);
+		port_status->wPortChange =
+		    cpu_to_le16(fhci->vroot_hub->port.wPortChange);
+		len = 4;
+		break;
+	case SetHubFeature:
+		switch (wValue) {
+		case C_HUB_OVER_CURRENT:
+		case C_HUB_LOCAL_POWER:
+			break;
+		default:
+			goto error;
+		}
+		break;
+	case SetPortFeature:
+		fhci->vroot_hub->feature |= (1 << wValue);
+
+		switch (wValue) {
+		case USB_PORT_FEAT_ENABLE:
+			fhci->vroot_hub->port.wPortStatus |=
+			    USB_PORT_STAT_ENABLE;
+			fhci_port_enable(fhci->usb_lld);
+			break;
+		case USB_PORT_FEAT_SUSPEND:
+			fhci->vroot_hub->port.wPortStatus |=
+			    USB_PORT_STAT_SUSPEND;
+			fhci_stop_sof_timer(fhci);
+			break;
+		case USB_PORT_FEAT_RESET:
+			fhci->vroot_hub->port.wPortStatus |=
+			    USB_PORT_STAT_RESET;
+			fhci_port_reset(fhci->usb_lld);
+			fhci->vroot_hub->port.wPortStatus |=
+			    USB_PORT_STAT_ENABLE;
+			fhci->vroot_hub->port.wPortStatus &=
+			    ~USB_PORT_STAT_RESET;
+			break;
+		case USB_PORT_FEAT_POWER:
+			fhci->vroot_hub->port.wPortStatus |=
+			    USB_PORT_STAT_POWER;
+			fhci_config_transceiver(fhci, FHCI_PORT_WAITING);
+			break;
+		default:
+			goto error;
+		}
+		break;
+	default:
+error:
+		retval = -EPIPE;
+	}
+
+	fhci_dbg(fhci, "<- %s\n", __func__);
+
+	spin_unlock_irqrestore(&fhci->lock, flags);
+
+	return retval;
+}