e872154921
This patch (as1069b) changes the way OHCI root-hub status-change interrupts are enabled. Currently a special HCD method, hub_irq_enable(), is called when the hub driver is finished using a root hub. This approach turns out to be subject to races, resulting in unnecessary polling. The patch does away with the method entirely. Instead, the driver automatically enables the RHSC interrupt when no more status changes are present. This scheme is safe with controllers using level-triggered semantics for their interrupt flags. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
250 lines
6.3 KiB
C
250 lines
6.3 KiB
C
/*
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* PS3 OHCI Host Controller driver
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*
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* Copyright (C) 2006 Sony Computer Entertainment Inc.
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* Copyright 2006 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <asm/firmware.h>
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#include <asm/ps3.h>
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static int ps3_ohci_hc_reset(struct usb_hcd *hcd)
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{
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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ohci->flags |= OHCI_QUIRK_BE_MMIO;
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ohci_hcd_init(ohci);
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return ohci_init(ohci);
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}
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static int __devinit ps3_ohci_hc_start(struct usb_hcd *hcd)
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{
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int result;
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struct ohci_hcd *ohci = hcd_to_ohci(hcd);
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/* Handle root hub init quirk in spider south bridge. */
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/* Also set PwrOn2PwrGood to 0x7f (254ms). */
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ohci_writel(ohci, 0x7f000000 | RH_A_PSM | RH_A_OCPM,
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&ohci->regs->roothub.a);
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ohci_writel(ohci, 0x00060000, &ohci->regs->roothub.b);
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result = ohci_run(ohci);
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if (result < 0) {
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err("can't start %s", hcd->self.bus_name);
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ohci_stop(hcd);
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}
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return result;
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}
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static const struct hc_driver ps3_ohci_hc_driver = {
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.description = hcd_name,
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.product_desc = "PS3 OHCI Host Controller",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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.irq = ohci_irq,
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.flags = HCD_MEMORY | HCD_USB11,
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.reset = ps3_ohci_hc_reset,
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.start = ps3_ohci_hc_start,
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.stop = ohci_stop,
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.shutdown = ohci_shutdown,
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.urb_enqueue = ohci_urb_enqueue,
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.urb_dequeue = ohci_urb_dequeue,
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.endpoint_disable = ohci_endpoint_disable,
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.get_frame_number = ohci_get_frame,
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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.start_port_reset = ohci_start_port_reset,
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#if defined(CONFIG_PM)
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.bus_suspend = ohci_bus_suspend,
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.bus_resume = ohci_bus_resume,
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#endif
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};
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static int ps3_ohci_probe(struct ps3_system_bus_device *dev)
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{
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int result;
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struct usb_hcd *hcd;
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unsigned int virq;
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static u64 dummy_mask = DMA_32BIT_MASK;
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if (usb_disabled()) {
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result = -ENODEV;
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goto fail_start;
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}
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result = ps3_open_hv_device(dev);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: ps3_open_hv_device failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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result = -EPERM;
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goto fail_open;
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}
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result = ps3_dma_region_create(dev->d_region);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: ps3_dma_region_create failed: "
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"(%d)\n", __func__, __LINE__, result);
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BUG_ON("check region type");
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goto fail_dma_region;
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}
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result = ps3_mmio_region_create(dev->m_region);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: ps3_map_mmio_region failed\n",
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__func__, __LINE__);
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result = -EPERM;
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goto fail_mmio_region;
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}
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dev_dbg(&dev->core, "%s:%d: mmio mapped_addr %lxh\n", __func__,
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__LINE__, dev->m_region->lpar_addr);
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result = ps3_io_irq_setup(PS3_BINDING_CPU_ANY, dev->interrupt_id, &virq);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: ps3_construct_io_irq(%d) failed.\n",
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__func__, __LINE__, virq);
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result = -EPERM;
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goto fail_irq;
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}
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dev->core.dma_mask = &dummy_mask; /* FIXME: for improper usb code */
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hcd = usb_create_hcd(&ps3_ohci_hc_driver, &dev->core, dev->core.bus_id);
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if (!hcd) {
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dev_dbg(&dev->core, "%s:%d: usb_create_hcd failed\n", __func__,
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__LINE__);
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result = -ENOMEM;
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goto fail_create_hcd;
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}
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hcd->rsrc_start = dev->m_region->lpar_addr;
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hcd->rsrc_len = dev->m_region->len;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name))
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dev_dbg(&dev->core, "%s:%d: request_mem_region failed\n",
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__func__, __LINE__);
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hcd->regs = ioremap(dev->m_region->lpar_addr, dev->m_region->len);
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if (!hcd->regs) {
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dev_dbg(&dev->core, "%s:%d: ioremap failed\n", __func__,
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__LINE__);
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result = -EPERM;
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goto fail_ioremap;
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}
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dev_dbg(&dev->core, "%s:%d: hcd->rsrc_start %lxh\n", __func__, __LINE__,
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(unsigned long)hcd->rsrc_start);
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dev_dbg(&dev->core, "%s:%d: hcd->rsrc_len %lxh\n", __func__, __LINE__,
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(unsigned long)hcd->rsrc_len);
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dev_dbg(&dev->core, "%s:%d: hcd->regs %lxh\n", __func__, __LINE__,
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(unsigned long)hcd->regs);
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dev_dbg(&dev->core, "%s:%d: virq %lu\n", __func__, __LINE__,
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(unsigned long)virq);
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ps3_system_bus_set_driver_data(dev, hcd);
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result = usb_add_hcd(hcd, virq, IRQF_DISABLED);
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if (result) {
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dev_dbg(&dev->core, "%s:%d: usb_add_hcd failed (%d)\n",
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__func__, __LINE__, result);
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goto fail_add_hcd;
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}
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return result;
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fail_add_hcd:
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iounmap(hcd->regs);
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fail_ioremap:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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fail_create_hcd:
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ps3_io_irq_destroy(virq);
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fail_irq:
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ps3_free_mmio_region(dev->m_region);
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fail_mmio_region:
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ps3_dma_region_free(dev->d_region);
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fail_dma_region:
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ps3_close_hv_device(dev);
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fail_open:
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fail_start:
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return result;
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}
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static int ps3_ohci_remove (struct ps3_system_bus_device *dev)
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{
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unsigned int tmp;
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struct usb_hcd *hcd =
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(struct usb_hcd *)ps3_system_bus_get_driver_data(dev);
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BUG_ON(!hcd);
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dev_dbg(&dev->core, "%s:%d: regs %p\n", __func__, __LINE__, hcd->regs);
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dev_dbg(&dev->core, "%s:%d: irq %u\n", __func__, __LINE__, hcd->irq);
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tmp = hcd->irq;
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usb_remove_hcd(hcd);
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ps3_system_bus_set_driver_data(dev, NULL);
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BUG_ON(!hcd->regs);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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ps3_io_irq_destroy(tmp);
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ps3_free_mmio_region(dev->m_region);
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ps3_dma_region_free(dev->d_region);
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ps3_close_hv_device(dev);
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return 0;
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}
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static int ps3_ohci_driver_register(struct ps3_system_bus_driver *drv)
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{
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return firmware_has_feature(FW_FEATURE_PS3_LV1)
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? ps3_system_bus_driver_register(drv)
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: 0;
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}
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static void ps3_ohci_driver_unregister(struct ps3_system_bus_driver *drv)
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{
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if (firmware_has_feature(FW_FEATURE_PS3_LV1))
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ps3_system_bus_driver_unregister(drv);
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}
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MODULE_ALIAS(PS3_MODULE_ALIAS_OHCI);
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static struct ps3_system_bus_driver ps3_ohci_driver = {
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.core.name = "ps3-ohci-driver",
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.core.owner = THIS_MODULE,
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.match_id = PS3_MATCH_ID_OHCI,
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.probe = ps3_ohci_probe,
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.remove = ps3_ohci_remove,
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.shutdown = ps3_ohci_remove,
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};
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