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linux/drivers/usb/host/ohci-tmio.c
Ingo Molnar 6184f15d87 headers/prep: Fix non-standard header section: drivers/usb/host/ohci-tmio.c 
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-05 16:18:11 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
#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 0x0010
#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);
fallthrough;
case 3:
pm |= CCR_PM_USBPW3;
fallthrough;
case 2:
pm |= CCR_PM_USBPW2;
fallthrough;
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),
(u64) 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) {
dev_err(hcd->self.controller, "can't start %s\n",
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,
/* 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 ohci_hcd_tmio_drv_probe(struct platform_device *dev)
{
const struct mfd_cell *cell = mfd_get_cell(dev);
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 || !regs || !config || !sram)
return -EINVAL;
if (irq < 0)
return irq;
hcd = usb_create_hcd(&ohci_tmio_hc_driver, &dev->dev, dev_name(&dev->dev));
if (!hcd) {
ret = -ENOMEM;
goto err_usb_create_hcd;
}
hcd->rsrc_start = regs->start;
hcd->rsrc_len = resource_size(regs);
tmio = hcd_to_tmio(hcd);
spin_lock_init(&tmio->lock);
tmio->ccr = ioremap(config->start, resource_size(config));
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 (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_hcd_setup_local_mem(hcd, sram->start, sram->start,
resource_size(sram));
if (ret < 0)
goto err_enable;
ret = usb_add_hcd(hcd, irq, 0);
if (ret)
goto err_add_hcd;
device_wakeup_enable(hcd->self.controller);
if (ret == 0)
return ret;
usb_remove_hcd(hcd);
err_add_hcd:
tmio_stop_hc(dev);
if (cell->disable)
cell->disable(dev);
err_enable:
iounmap(hcd->regs);
err_ioremap_regs:
iounmap(tmio->ccr);
err_ioremap_ccr:
usb_put_hcd(hcd);
err_usb_create_hcd:
return ret;
}
static int 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);
const struct mfd_cell *cell = mfd_get_cell(dev);
usb_remove_hcd(hcd);
tmio_stop_hc(dev);
if (cell->disable)
cell->disable(dev);
iounmap(hcd->regs);
iounmap(tmio->ccr);
usb_put_hcd(hcd);
return 0;
}
#ifdef CONFIG_PM
static int ohci_hcd_tmio_drv_suspend(struct platform_device *dev, pm_message_t state)
{
const struct mfd_cell *cell = mfd_get_cell(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);
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;
}
return 0;
}
static int ohci_hcd_tmio_drv_resume(struct platform_device *dev)
{
const struct mfd_cell *cell = mfd_get_cell(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);
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_resume(hcd, false);
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 = 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",
},
};
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