isp116x-hcd.c

usb driver for 2.6.17

}

static void dump_int(struct seq_file *s, char *label, u32 mask)
{
	seq_printf(s, "%s %08x%s%s%s%s%s%s%s\n", label, mask,
		   mask & HCINT_MIE ? " MIE" : "",
		   mask & HCINT_RHSC ? " rhsc" : "",
		   mask & HCINT_FNO ? " fno" : "",
		   mask & HCINT_UE ? " ue" : "",
		   mask & HCINT_RD ? " rd" : "",
		   mask & HCINT_SF ? " sof" : "", mask & HCINT_SO ? " so" : "");
}

static int isp116x_show_dbg(struct seq_file *s, void *unused)
{
	struct isp116x *isp116x = s->private;

	seq_printf(s, "%s\n%s version %s\n",
		   isp116x_to_hcd(isp116x)->product_desc, hcd_name,
		   DRIVER_VERSION);

	if (HC_IS_SUSPENDED(isp116x_to_hcd(isp116x)->state)) {
		seq_printf(s, "HCD is suspended\n");
		return 0;
	}
	if (!HC_IS_RUNNING(isp116x_to_hcd(isp116x)->state)) {
		seq_printf(s, "HCD not running\n");
		return 0;
	}

	spin_lock_irq(&isp116x->lock);
	dump_irq(s, "hc_irq_enable", isp116x_read_reg16(isp116x, HCuPINTENB));
	dump_irq(s, "hc_irq_status", isp116x_read_reg16(isp116x, HCuPINT));
	dump_int(s, "hc_int_enable", isp116x_read_reg32(isp116x, HCINTENB));
	dump_int(s, "hc_int_status", isp116x_read_reg32(isp116x, HCINTSTAT));
	isp116x_show_regs_seq(isp116x, s);
	spin_unlock_irq(&isp116x->lock);
	seq_printf(s, "\n");

	return 0;
}

static int isp116x_open_seq(struct inode *inode, struct file *file)
{
	return single_open(file, isp116x_show_dbg, inode->u.generic_ip);
}

static struct file_operations isp116x_debug_fops = {
	.open = isp116x_open_seq,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int create_debug_file(struct isp116x *isp116x)
{
	isp116x->dentry = debugfs_create_file(hcd_name,
					      S_IRUGO, NULL, isp116x,
					      &isp116x_debug_fops);
	if (!isp116x->dentry)
		return -ENOMEM;
	return 0;
}

static void remove_debug_file(struct isp116x *isp116x)
{
	debugfs_remove(isp116x->dentry);
}

#else

#define	create_debug_file(d)	0
#define	remove_debug_file(d)	do{}while(0)

#endif				/* CONFIG_DEBUG_FS */

/*-----------------------------------------------------------------*/

/*
  Software reset - can be called from any contect.
*/
static int isp116x_sw_reset(struct isp116x *isp116x)
{
	int retries = 15;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&isp116x->lock, flags);
	isp116x_write_reg16(isp116x, HCSWRES, HCSWRES_MAGIC);
	isp116x_write_reg32(isp116x, HCCMDSTAT, HCCMDSTAT_HCR);
	while (--retries) {
		/* It usually resets within 1 ms */
		mdelay(1);
		if (!(isp116x_read_reg32(isp116x, HCCMDSTAT) & HCCMDSTAT_HCR))
			break;
	}
	if (!retries) {
		ERR("Software reset timeout\n");
		ret = -ETIME;
	}
	spin_unlock_irqrestore(&isp116x->lock, flags);
	return ret;
}

static int isp116x_reset(struct usb_hcd *hcd)
{
	struct isp116x *isp116x = hcd_to_isp116x(hcd);
	unsigned long t;
	u16 clkrdy = 0;
	int ret, timeout = 15 /* ms */ ;

	ret = isp116x_sw_reset(isp116x);
	if (ret)
		return ret;

	t = jiffies + msecs_to_jiffies(timeout);
	while (time_before_eq(jiffies, t)) {
		msleep(4);
		spin_lock_irq(&isp116x->lock);
		clkrdy = isp116x_read_reg16(isp116x, HCuPINT) & HCuPINT_CLKRDY;
		spin_unlock_irq(&isp116x->lock);
		if (clkrdy)
			break;
	}
	if (!clkrdy) {
		ERR("Clock not ready after %dms\n", timeout);
		/* After sw_reset the clock won't report to be ready, if
		   H_WAKEUP pin is high. */
		ERR("Please make sure that the H_WAKEUP pin is pulled low!\n");
		ret = -ENODEV;
	}
	return ret;
}

static void isp116x_stop(struct usb_hcd *hcd)
{
	struct isp116x *isp116x = hcd_to_isp116x(hcd);
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&isp116x->lock, flags);
	isp116x_write_reg16(isp116x, HCuPINTENB, 0);

	/* Switch off ports' power, some devices don't come up
	   after next 'insmod' without this */
	val = isp116x_read_reg32(isp116x, HCRHDESCA);
	val &= ~(RH_A_NPS | RH_A_PSM);
	isp116x_write_reg32(isp116x, HCRHDESCA, val);
	isp116x_write_reg32(isp116x, HCRHSTATUS, RH_HS_LPS);
	spin_unlock_irqrestore(&isp116x->lock, flags);

	isp116x_sw_reset(isp116x);
}

/*
  Configure the chip. The chip must be successfully reset by now.
*/
static int isp116x_start(struct usb_hcd *hcd)
{
	struct isp116x *isp116x = hcd_to_isp116x(hcd);
	struct isp116x_platform_data *board = isp116x->board;
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&isp116x->lock, flags);

	/* clear interrupt status and disable all interrupt sources */
	isp116x_write_reg16(isp116x, HCuPINT, 0xff);
	isp116x_write_reg16(isp116x, HCuPINTENB, 0);

	val = isp116x_read_reg16(isp116x, HCCHIPID);
	if ((val & HCCHIPID_MASK) != HCCHIPID_MAGIC) {
		ERR("Invalid chip ID %04x\n", val);
		spin_unlock_irqrestore(&isp116x->lock, flags);
		return -ENODEV;
	}

	/* To be removed in future */
	hcd->uses_new_polling = 1;

	isp116x_write_reg16(isp116x, HCITLBUFLEN, ISP116x_ITL_BUFSIZE);
	isp116x_write_reg16(isp116x, HCATLBUFLEN, ISP116x_ATL_BUFSIZE);

	/* ----- HW conf */
	val = HCHWCFG_INT_ENABLE | HCHWCFG_DBWIDTH(1);
	if (board->sel15Kres)
		val |= HCHWCFG_15KRSEL;
	/* Remote wakeup won't work without working clock */
	if (board->remote_wakeup_enable)
		val |= HCHWCFG_CLKNOTSTOP;
	if (board->oc_enable)
		val |= HCHWCFG_ANALOG_OC;
	if (board->int_act_high)
		val |= HCHWCFG_INT_POL;
	if (board->int_edge_triggered)
		val |= HCHWCFG_INT_TRIGGER;
	isp116x_write_reg16(isp116x, HCHWCFG, val);

	/* ----- Root hub conf */
	val = (25 << 24) & RH_A_POTPGT;
	/* AN10003_1.pdf recommends RH_A_NPS (no power switching) to
	   be always set. Yet, instead, we request individual port
	   power switching. */
	val |= RH_A_PSM;
	/* Report overcurrent per port */
	val |= RH_A_OCPM;
	isp116x_write_reg32(isp116x, HCRHDESCA, val);
	isp116x->rhdesca = isp116x_read_reg32(isp116x, HCRHDESCA);

	val = RH_B_PPCM;
	isp116x_write_reg32(isp116x, HCRHDESCB, val);
	isp116x->rhdescb = isp116x_read_reg32(isp116x, HCRHDESCB);

	val = 0;
	if (board->remote_wakeup_enable) {
		if (!device_can_wakeup(hcd->self.controller))
			device_init_wakeup(hcd->self.controller, 1);
		val |= RH_HS_DRWE;
	}
	isp116x_write_reg32(isp116x, HCRHSTATUS, val);
	isp116x->rhstatus = isp116x_read_reg32(isp116x, HCRHSTATUS);

	isp116x_write_reg32(isp116x, HCFMINTVL, 0x27782edf);

	hcd->state = HC_STATE_RUNNING;

	/* Set up interrupts */
	isp116x->intenb = HCINT_MIE | HCINT_RHSC | HCINT_UE;
	if (board->remote_wakeup_enable)
		isp116x->intenb |= HCINT_RD;
	isp116x->irqenb = HCuPINT_ATL | HCuPINT_OPR;	/* | HCuPINT_SUSP; */
	isp116x_write_reg32(isp116x, HCINTENB, isp116x->intenb);
	isp116x_write_reg16(isp116x, HCuPINTENB, isp116x->irqenb);

	/* Go operational */
	val = HCCONTROL_USB_OPER;
	if (board->remote_wakeup_enable)
		val |= HCCONTROL_RWE;
	isp116x_write_reg32(isp116x, HCCONTROL, val);

	/* Disable ports to avoid race in device enumeration */
	isp116x_write_reg32(isp116x, HCRHPORT1, RH_PS_CCS);
	isp116x_write_reg32(isp116x, HCRHPORT2, RH_PS_CCS);

	isp116x_show_regs_log(isp116x);
	spin_unlock_irqrestore(&isp116x->lock, flags);
	return 0;
}

#ifdef	CONFIG_PM

static int isp116x_bus_suspend(struct usb_hcd *hcd)
{
	struct isp116x *isp116x = hcd_to_isp116x(hcd);
	unsigned long flags;
	u32 val;
	int ret = 0;

	spin_lock_irqsave(&isp116x->lock, flags);
	val = isp116x_read_reg32(isp116x, HCCONTROL);

	switch (val & HCCONTROL_HCFS) {
	case HCCONTROL_USB_OPER:
		spin_unlock_irqrestore(&isp116x->lock, flags);
		val &= (~HCCONTROL_HCFS & ~HCCONTROL_RWE);
		val |= HCCONTROL_USB_SUSPEND;
		if (device_may_wakeup(&hcd->self.root_hub->dev))
			val |= HCCONTROL_RWE;
		/* Wait for usb transfers to finish */
		msleep(2);
		spin_lock_irqsave(&isp116x->lock, flags);
		isp116x_write_reg32(isp116x, HCCONTROL, val);
		spin_unlock_irqrestore(&isp116x->lock, flags);
		/* Wait for devices to suspend */
		msleep(5);
		break;
	case HCCONTROL_USB_RESUME:
		isp116x_write_reg32(isp116x, HCCONTROL,
				    (val & ~HCCONTROL_HCFS) |
				    HCCONTROL_USB_RESET);
	case HCCONTROL_USB_RESET:
		ret = -EBUSY;
	default:		/* HCCONTROL_USB_SUSPEND */
		spin_unlock_irqrestore(&isp116x->lock, flags);
		break;
	}

	return ret;
}

static int isp116x_bus_resume(struct usb_hcd *hcd)
{
	struct isp116x *isp116x = hcd_to_isp116x(hcd);
	u32 val;

	msleep(5);
	spin_lock_irq(&isp116x->lock);

	val = isp116x_read_reg32(isp116x, HCCONTROL);
	switch (val & HCCONTROL_HCFS) {
	case HCCONTROL_USB_SUSPEND:
		val &= ~HCCONTROL_HCFS;
		val |= HCCONTROL_USB_RESUME;
		isp116x_write_reg32(isp116x, HCCONTROL, val);
	case HCCONTROL_USB_RESUME:
		break;
	case HCCONTROL_USB_OPER:
		spin_unlock_irq(&isp116x->lock);
		/* Without setting power_state here the
		   SUSPENDED state won't be removed from
		   sysfs/usbN/power.state as a response to remote
		   wakeup. Maybe in the future. */
		hcd->self.root_hub->dev.power.power_state = PMSG_ON;
		return 0;
	default:
		/* HCCONTROL_USB_RESET: this may happen, when during
		   suspension the HC lost power. Reinitialize completely */
		spin_unlock_irq(&isp116x->lock);
		DBG("Chip has been reset while suspended. Reinit from scratch.\n");
		isp116x_reset(hcd);
		isp116x_start(hcd);
		isp116x_hub_control(hcd, SetPortFeature,
				    USB_PORT_FEAT_POWER, 1, NULL, 0);
		if ((isp116x->rhdesca & RH_A_NDP) == 2)
			isp116x_hub_control(hcd, SetPortFeature,
					    USB_PORT_FEAT_POWER, 2, NULL, 0);
		hcd->self.root_hub->dev.power.power_state = PMSG_ON;
		return 0;
	}

	val = isp116x->rhdesca & RH_A_NDP;
	while (val--) {
		u32 stat =
		    isp116x_read_reg32(isp116x, val ? HCRHPORT2 : HCRHPORT1);
		/* force global, not selective, resume */
		if (!(stat & RH_PS_PSS))
			continue;
		DBG("%s: Resuming port %d\n", __func__, val);
		isp116x_write_reg32(isp116x, RH_PS_POCI, val
				    ? HCRHPORT2 : HCRHPORT1);
	}
	spin_unlock_irq(&isp116x->lock);

	hcd->state = HC_STATE_RESUMING;
	msleep(20);

	/* Go operational */
	spin_lock_irq(&isp116x->lock);
	val = isp116x_read_reg32(isp116x, HCCONTROL);
	isp116x_write_reg32(isp116x, HCCONTROL,
			    (val & ~HCCONTROL_HCFS) | HCCONTROL_USB_OPER);
	spin_unlock_irq(&isp116x->lock);
	/* see analogous comment above */
	hcd->self.root_hub->dev.power.power_state = PMSG_ON;
	hcd->state = HC_STATE_RUNNING;

	return 0;
}

#else

#define	isp116x_bus_suspend	NULL
#define	isp116x_bus_resume	NULL

#endif

static struct hc_driver isp116x_hc_driver = {
	.description = hcd_name,
	.product_desc = "ISP116x Host Controller",
	.hcd_priv_size = sizeof(struct isp116x),

	.irq = isp116x_irq,
	.flags = HCD_USB11,

	.reset = isp116x_reset,
	.start = isp116x_start,
	.stop = isp116x_stop,

	.urb_enqueue = isp116x_urb_enqueue,
	.urb_dequeue = isp116x_urb_dequeue,
	.endpoint_disable = isp116x_endpoint_disable,

	.get_frame_number = isp116x_get_frame,

	.hub_status_data = isp116x_hub_status_data,
	.hub_control = isp116x_hub_control,
	.bus_suspend = isp116x_bus_suspend,
	.bus_resume = isp116x_bus_resume,
};

/*----------------------------------------------------------------*/

static int isp116x_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct isp116x *isp116x;
	struct resource *res;

	if (!hcd)
		return 0;
	isp116x = hcd_to_isp116x(hcd);
	remove_debug_file(isp116x);
	usb_remove_hcd(hcd);

	iounmap(isp116x->data_reg);
	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	release_mem_region(res->start, 2);
	iounmap(isp116x->addr_reg);
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, 2);

	usb_put_hcd(hcd);
	return 0;
}

#define resource_len(r) (((r)->end - (r)->start) + 1)

static int __init isp116x_probe(struct platform_device *pdev)
{
	struct usb_hcd *hcd;
	struct isp116x *isp116x;
	struct resource *addr, *data;
	void __iomem *addr_reg;
	void __iomem *data_reg;
	int irq;
	int ret = 0;

	if (pdev->num_resources < 3) {
		ret = -ENODEV;
		goto err1;
	}

	data = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	addr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	irq = platform_get_irq(pdev, 0);
	if (!addr || !data || irq < 0) {
		ret = -ENODEV;
		goto err1;
	}

	if (pdev->dev.dma_mask) {
		DBG("DMA not supported\n");
		ret = -EINVAL;
		goto err1;
	}

	if (!request_mem_region(addr->start, 2, hcd_name)) {
		ret = -EBUSY;
		goto err1;
	}
	addr_reg = ioremap(addr->start, resource_len(addr));
	if (addr_reg == NULL) {
		ret = -ENOMEM;
		goto err2;
	}
	if (!request_mem_region(data->start, 2, hcd_name)) {
		ret = -EBUSY;
		goto err3;
	}
	data_reg = ioremap(data->start, resource_len(data));
	if (data_reg == NULL) {
		ret = -ENOMEM;
		goto err4;
	}

	/* allocate and initialize hcd */
	hcd = usb_create_hcd(&isp116x_hc_driver, &pdev->dev, pdev->dev.bus_id);
	if (!hcd) {
		ret = -ENOMEM;
		goto err5;
	}
	/* this rsrc_start is bogus */
	hcd->rsrc_start = addr->start;
	isp116x = hcd_to_isp116x(hcd);
	isp116x->data_reg = data_reg;
	isp116x->addr_reg = addr_reg;
	spin_lock_init(&isp116x->lock);
	INIT_LIST_HEAD(&isp116x->async);
	isp116x->board = pdev->dev.platform_data;

	if (!isp116x->board) {
		ERR("Platform data structure not initialized\n");
		ret = -ENODEV;
		goto err6;
	}
	if (isp116x_check_platform_delay(isp116x)) {
		ERR("USE_PLATFORM_DELAY defined, but delay function not "
		    "implemented.\n");
		ERR("See comments in drivers/usb/host/isp116x-hcd.c\n");
		ret = -ENODEV;
		goto err6;
	}

	ret = usb_add_hcd(hcd, irq, SA_INTERRUPT);
	if (ret)
		goto err6;

	ret = create_debug_file(isp116x);
	if (ret) {
		ERR("Couldn't create debugfs entry\n");
		goto err7;
	}

	return 0;

      err7:
	usb_remove_hcd(hcd);
      err6:
	usb_put_hcd(hcd);
      err5:
	iounmap(data_reg);
      err4:
	release_mem_region(data->start, 2);
      err3:
	iounmap(addr_reg);
      err2:
	release_mem_region(addr->start, 2);
      err1:
	ERR("init error, %d\n", ret);
	return ret;
}

#ifdef	CONFIG_PM
/*
  Suspend of platform device
*/
static int isp116x_suspend(struct platform_device *dev, pm_message_t state)
{
	VDBG("%s: state %x\n", __func__, state.event);
	dev->dev.power.power_state = state;
	return 0;
}

/*
  Resume platform device
*/
static int isp116x_resume(struct platform_device *dev)
{
	VDBG("%s:  state %x\n", __func__, dev->power.power_state.event);
	dev->dev.power.power_state = PMSG_ON;
	return 0;
}

#else

#define	isp116x_suspend    NULL
#define	isp116x_resume     NULL

#endif

static struct platform_driver isp116x_driver = {
	.probe = isp116x_probe,
	.remove = isp116x_remove,
	.suspend = isp116x_suspend,
	.resume = isp116x_resume,
	.driver = {
		   .name = (char *)hcd_name,
		   },
};

/*-----------------------------------------------------------------*/

static int __init isp116x_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	INFO("driver %s, %s\n", hcd_name, DRIVER_VERSION);
	return platform_driver_register(&isp116x_driver);
}

module_init(isp116x_init);

static void __exit isp116x_cleanup(void)
{
	platform_driver_unregister(&isp116x_driver);
}

module_exit(isp116x_cleanup);