USB: ohci: add support for tmio-ohci cell

Some Toshiba Mobile I/O chips have OHCI controller built in.
E.g. the tc6393xb chip found in several Toshiba e-Series PDAs
and in Sharp Zaurus SL-6000 PDA. This adds platform glue
to support OHCI function of the chip.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Ian Molton <spyro@f2s.com>
Cc: Ian Molton <spyro@f2s.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 376 insertions, 0 deletions

diff --git a/drivers/usb/host/ohci-tmio.c b/drivers/usb/host/ohci-tmio.c
new file mode 100644
index 00000000000..f9f134af0bd
--- /dev/null
+++ b/drivers/usb/host/ohci-tmio.c
@@ -0,0 +1,376 @@
+/*
+ * OHCI HCD(Host Controller Driver) for USB.
+ *
+ *(C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ *(C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ *(C) Copyright 2002 Hewlett-Packard Company
+ *
+ * Bus glue for Toshiba Mobile IO(TMIO) Controller's OHCI core
+ * (C) Copyright 2005 Chris Humbert <mahadri-usb@drigon.com>
+ * (C) Copyright 2007, 2008 Dmitry Baryshkov <dbaryshkov@gmail.com>
+ *
+ * This is known to work with the following variants:
+ *	TC6393XB revision 3	(32kB SRAM)
+ *
+ * The TMIO's OHCI core DMAs through a small internal buffer that
+ * is directly addressable by the CPU.
+ *
+ * Written from sparse documentation from Toshiba and Sharp's driver
+ * for the 2.4 kernel,
+ *	usb-ohci-tc6393.c(C) Copyright 2004 Lineo Solutions, Inc.
+ *
+ * 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.
+ */
+
+/*#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pagemap.h>
+#include <linux/init.h>
+#include <linux/namei.h>
+#include <linux/sched.h>*/
+#include <linux/platform_device.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tmio.h>
+#include <linux/dma-mapping.h>
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * USB Host Controller Configuration Register
+ */
+#define CCR_REVID	0x08	/* b Revision ID				*/
+#define CCR_BASE	0x10	/* l USB Control Register Base Address Low	*/
+#define CCR_ILME	0x40	/* b Internal Local Memory Enable		*/
+#define CCR_PM		0x4c	/* w Power Management			*/
+#define CCR_INTC	0x50	/* b INT Control				*/
+#define CCR_LMW1L	0x54	/* w Local Memory Window 1 LMADRS Low	*/
+#define CCR_LMW1H	0x56	/* w Local Memory Window 1 LMADRS High	*/
+#define CCR_LMW1BL	0x58	/* w Local Memory Window 1 Base Address Low	*/
+#define CCR_LMW1BH	0x5A	/* w Local Memory Window 1 Base Address High	*/
+#define CCR_LMW2L	0x5C	/* w Local Memory Window 2 LMADRS Low	*/
+#define CCR_LMW2H	0x5E	/* w Local Memory Window 2 LMADRS High	*/
+#define CCR_LMW2BL	0x60	/* w Local Memory Window 2 Base Address Low	*/
+#define CCR_LMW2BH	0x62	/* w Local Memory Window 2 Base Address High	*/
+#define CCR_MISC	0xFC	/* b MISC					*/
+
+#define CCR_PM_GKEN      0x0001
+#define CCR_PM_CKRNEN    0x0002
+#define CCR_PM_USBPW1    0x0004
+#define CCR_PM_USBPW2    0x0008
+#define CCR_PM_USBPW3    0x0008
+#define CCR_PM_PMEE      0x0100
+#define CCR_PM_PMES      0x8000
+
+/*-------------------------------------------------------------------------*/
+
+struct tmio_hcd {
+	void __iomem		*ccr;
+	spinlock_t		lock; /* protects RMW cycles */
+};
+
+#define hcd_to_tmio(hcd)	((struct tmio_hcd *)(hcd_to_ohci(hcd) + 1))
+
+/*-------------------------------------------------------------------------*/
+
+static void tmio_write_pm(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
+	u16 pm;
+	unsigned long flags;
+
+	spin_lock_irqsave(&tmio->lock, flags);
+
+	pm = CCR_PM_GKEN | CCR_PM_CKRNEN |
+	     CCR_PM_PMEE | CCR_PM_PMES;
+
+	tmio_iowrite16(pm, tmio->ccr + CCR_PM);
+	spin_unlock_irqrestore(&tmio->lock, flags);
+}
+
+static void tmio_stop_hc(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
+	u16 pm;
+
+	pm = CCR_PM_GKEN | CCR_PM_CKRNEN;
+	switch (ohci->num_ports) {
+		default:
+			dev_err(&dev->dev, "Unsupported amount of ports: %d\n", ohci->num_ports);
+		case 3:
+			pm |= CCR_PM_USBPW3;
+		case 2:
+			pm |= CCR_PM_USBPW2;
+		case 1:
+			pm |= CCR_PM_USBPW1;
+	}
+	tmio_iowrite8(0, tmio->ccr + CCR_INTC);
+	tmio_iowrite8(0, tmio->ccr + CCR_ILME);
+	tmio_iowrite16(0, tmio->ccr + CCR_BASE);
+	tmio_iowrite16(0, tmio->ccr + CCR_BASE + 2);
+	tmio_iowrite16(pm, tmio->ccr + CCR_PM);
+}
+
+static void tmio_start_hc(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
+	unsigned long base = hcd->rsrc_start;
+
+	tmio_write_pm(dev);
+	tmio_iowrite16(base, tmio->ccr + CCR_BASE);
+	tmio_iowrite16(base >> 16, tmio->ccr + CCR_BASE + 2);
+	tmio_iowrite8(1, tmio->ccr + CCR_ILME);
+	tmio_iowrite8(2, tmio->ccr + CCR_INTC);
+
+	dev_info(&dev->dev, "revision %d @ 0x%08llx, irq %d\n",
+			tmio_ioread8(tmio->ccr + CCR_REVID), hcd->rsrc_start, hcd->irq);
+}
+
+static int ohci_tmio_start(struct usb_hcd *hcd)
+{
+	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+	int ret;
+
+	if ((ret = ohci_init(ohci)) < 0)
+		return ret;
+
+	if ((ret = ohci_run(ohci)) < 0) {
+		err("can't start %s", hcd->self.bus_name);
+		ohci_stop(hcd);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct hc_driver ohci_tmio_hc_driver = {
+	.description =		hcd_name,
+	.product_desc =		"TMIO OHCI USB Host Controller",
+	.hcd_priv_size =	sizeof(struct ohci_hcd) + sizeof (struct tmio_hcd),
+
+	/* generic hardware linkage */
+	.irq =			ohci_irq,
+	.flags =		HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
+
+	/* basic lifecycle operations */
+	.start =		ohci_tmio_start,
+	.stop =			ohci_stop,
+	.shutdown =		ohci_shutdown,
+
+	/* managing i/o requests and associated device resources */
+	.urb_enqueue =		ohci_urb_enqueue,
+	.urb_dequeue =		ohci_urb_dequeue,
+	.endpoint_disable =	ohci_endpoint_disable,
+
+	/* scheduling support */
+	.get_frame_number =	ohci_get_frame,
+
+	/* root hub support */
+	.hub_status_data =	ohci_hub_status_data,
+	.hub_control =		ohci_hub_control,
+#ifdef	CONFIG_PM
+	.bus_suspend =		ohci_bus_suspend,
+	.bus_resume =		ohci_bus_resume,
+#endif
+	.start_port_reset =	ohci_start_port_reset,
+};
+
+/*-------------------------------------------------------------------------*/
+static struct platform_driver ohci_hcd_tmio_driver;
+
+static int __devinit ohci_hcd_tmio_drv_probe(struct platform_device *dev)
+{
+	struct mfd_cell *cell = dev->dev.platform_data;
+	struct resource *regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	struct resource *config = platform_get_resource(dev, IORESOURCE_MEM, 1);
+	struct resource *sram = platform_get_resource(dev, IORESOURCE_MEM, 2);
+	int irq = platform_get_irq(dev, 0);
+	struct tmio_hcd *tmio;
+	struct ohci_hcd *ohci;
+	struct usb_hcd *hcd;
+	int ret;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	if (!cell)
+		return -EINVAL;
+
+	hcd = usb_create_hcd(&ohci_tmio_hc_driver, &dev->dev, dev->dev.bus_id);
+	if (!hcd) {
+		ret = -ENOMEM;
+		goto err_usb_create_hcd;
+	}
+
+	hcd->rsrc_start = regs->start;
+	hcd->rsrc_len = regs->end - regs->start + 1;
+
+	tmio = hcd_to_tmio(hcd);
+
+	spin_lock_init(&tmio->lock);
+
+	tmio->ccr = ioremap(config->start, config->end - config->start + 1);
+	if (!tmio->ccr) {
+		ret = -ENOMEM;
+		goto err_ioremap_ccr;
+	}
+
+	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+	if (!hcd->regs) {
+		ret = -ENOMEM;
+		goto err_ioremap_regs;
+	}
+
+	if (!dma_declare_coherent_memory(&dev->dev, sram->start,
+				sram->start,
+				sram->end - sram->start + 1,
+				DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE)) {
+		ret = -EBUSY;
+		goto err_dma_declare;
+	}
+
+	if (cell->enable) {
+		ret = cell->enable(dev);
+		if (ret)
+			goto err_enable;
+	}
+
+	tmio_start_hc(dev);
+	ohci = hcd_to_ohci(hcd);
+	ohci_hcd_init(ohci);
+
+	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
+	if (ret)
+		goto err_add_hcd;
+
+	if (ret == 0)
+		return ret;
+
+	usb_remove_hcd(hcd);
+
+err_add_hcd:
+	tmio_stop_hc(dev);
+	if (cell->disable)
+		cell->disable(dev);
+err_enable:
+	dma_release_declared_memory(&dev->dev);
+err_dma_declare:
+	iounmap(hcd->regs);
+err_ioremap_regs:
+	iounmap(tmio->ccr);
+err_ioremap_ccr:
+	usb_put_hcd(hcd);
+err_usb_create_hcd:
+
+	return ret;
+}
+
+static int __devexit ohci_hcd_tmio_drv_remove(struct platform_device *dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
+	struct mfd_cell *cell = dev->dev.platform_data;
+
+	usb_remove_hcd(hcd);
+	tmio_stop_hc(dev);
+	if (cell->disable)
+		cell->disable(dev);
+	dma_release_declared_memory(&dev->dev);
+	iounmap(hcd->regs);
+	iounmap(tmio->ccr);
+	usb_put_hcd(hcd);
+
+	platform_set_drvdata(dev, NULL);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int ohci_hcd_tmio_drv_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct mfd_cell *cell = dev->dev.platform_data;
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
+	unsigned long flags;
+	u8 misc;
+	int ret;
+
+	if (time_before(jiffies, ohci->next_statechange))
+		msleep(5);
+	ohci->next_statechange = jiffies;
+
+	spin_lock_irqsave(&tmio->lock, flags);
+
+	misc = tmio_ioread8(tmio->ccr + CCR_MISC);
+	misc |= 1 << 3; /* USSUSP */
+	tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
+
+	spin_unlock_irqrestore(&tmio->lock, flags);
+
+	if (cell->suspend) {
+		ret = cell->suspend(dev);
+		if (ret)
+			return ret;
+	}
+
+	hcd->state = HC_STATE_SUSPENDED;
+
+	return 0;
+}
+
+static int ohci_hcd_tmio_drv_resume(struct platform_device *dev)
+{
+	struct mfd_cell *cell = dev->dev.platform_data;
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+	struct tmio_hcd *tmio = hcd_to_tmio(hcd);
+	unsigned long flags;
+	u8 misc;
+	int ret;
+
+	if (time_before(jiffies, ohci->next_statechange))
+		msleep(5);
+	ohci->next_statechange = jiffies;
+
+	if (cell->resume) {
+		ret = cell->resume(dev);
+		if (ret)
+			return ret;
+	}
+
+	tmio_start_hc(dev);
+
+	spin_lock_irqsave(&tmio->lock, flags);
+
+	misc = tmio_ioread8(tmio->ccr + CCR_MISC);
+	misc &= ~(1 << 3); /* USSUSP */
+	tmio_iowrite8(misc, tmio->ccr + CCR_MISC);
+
+	spin_unlock_irqrestore(&tmio->lock, flags);
+
+	ohci_finish_controller_resume(hcd);
+
+	return 0;
+}
+#else
+#define ohci_hcd_tmio_drv_suspend NULL
+#define ohci_hcd_tmio_drv_resume NULL
+#endif
+
+static struct platform_driver ohci_hcd_tmio_driver = {
+	.probe		= ohci_hcd_tmio_drv_probe,
+	.remove		= __devexit_p(ohci_hcd_tmio_drv_remove),
+	.shutdown	= usb_hcd_platform_shutdown,
+	.suspend	= ohci_hcd_tmio_drv_suspend,
+	.resume		= ohci_hcd_tmio_drv_resume,
+	.driver		= {
+		.name	= "tmio-ohci",
+		.owner	= THIS_MODULE,
+	},
+};