usb: ohci-sm501 driver
usb: ohci-sm501 driver V2 This patch adds sm501 ohci support. It's all very straightforward with the exception of dma_declare_coherent_memory() and HCD_LOCAL_MEM. Together they are used to ensure that usb data is allocated using dma_alloc_coherent(), and that only valid dma memory is used to allocate from. This driver is a platform device, and the mfd driver sm501.c is already creating one usb host controller instance per sm501. Signed-off-by: Magnus Damm <damm@igel.co.jp> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Magnus Damm
Greg Kroah-Hartman
parent
b347667532
commit
f54aab6ebc
2 changed files with 269 additions and 0 deletions
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@ -1052,6 +1052,11 @@ MODULE_LICENSE ("GPL");
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#define SSB_OHCI_DRIVER ssb_ohci_driver
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#endif
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#ifdef CONFIG_MFD_SM501
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#include "ohci-sm501.c"
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#define PLATFORM_DRIVER ohci_hcd_sm501_driver
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#endif
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#if !defined(PCI_DRIVER) && \
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!defined(PLATFORM_DRIVER) && \
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!defined(OF_PLATFORM_DRIVER) && \
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264
drivers/usb/host/ohci-sm501.c
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264
drivers/usb/host/ohci-sm501.c
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@ -0,0 +1,264 @@
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/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2005 David Brownell
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* (C) Copyright 2002 Hewlett-Packard Company
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* (C) Copyright 2008 Magnus Damm
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*
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* SM501 Bus Glue - based on ohci-omap.c
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*
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* This file is licenced under the GPL.
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*/
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/sm501.h>
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#include <linux/sm501-regs.h>
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static int ohci_sm501_init(struct usb_hcd *hcd)
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{
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return ohci_init(hcd_to_ohci(hcd));
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}
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static int ohci_sm501_start(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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int ret;
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ret = ohci_run(hcd_to_ohci(hcd));
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if (ret < 0) {
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dev_err(dev, "can't start %s", hcd->self.bus_name);
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ohci_stop(hcd);
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}
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return ret;
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}
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/*-------------------------------------------------------------------------*/
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static const struct hc_driver ohci_sm501_hc_driver = {
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.description = hcd_name,
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.product_desc = "SM501 OHCI",
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.hcd_priv_size = sizeof(struct ohci_hcd),
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/*
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* generic hardware linkage
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*/
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.irq = ohci_irq,
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.flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
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/*
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* basic lifecycle operations
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*/
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.reset = ohci_sm501_init,
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.start = ohci_sm501_start,
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.stop = ohci_stop,
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.shutdown = ohci_shutdown,
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/*
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* managing i/o requests and associated device resources
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*/
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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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/*
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* scheduling support
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*/
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.get_frame_number = ohci_get_frame,
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/*
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* root hub support
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*/
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.hub_status_data = ohci_hub_status_data,
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.hub_control = ohci_hub_control,
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.hub_irq_enable = ohci_rhsc_enable,
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#ifdef 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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.start_port_reset = ohci_start_port_reset,
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};
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/*-------------------------------------------------------------------------*/
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static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
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{
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const struct hc_driver *driver = &ohci_sm501_hc_driver;
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struct device *dev = &pdev->dev;
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struct resource *res, *mem;
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int retval, irq;
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struct usb_hcd *hcd = 0;
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irq = retval = platform_get_irq(pdev, 0);
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if (retval < 0)
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goto err0;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (mem == NULL) {
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dev_err(dev, "no resource definition for memory\n");
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retval = -ENOENT;
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goto err0;
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}
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if (!request_mem_region(mem->start, mem->end - mem->start + 1,
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pdev->name)) {
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dev_err(dev, "request_mem_region failed\n");
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retval = -EBUSY;
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goto err0;
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}
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/* The sm501 chip is equipped with local memory that may be used
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* by on-chip devices such as the video controller and the usb host.
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* This driver uses dma_declare_coherent_memory() to make sure
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* usb allocations with dma_alloc_coherent() allocate from
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* this local memory. The dma_handle returned by dma_alloc_coherent()
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* will be an offset starting from 0 for the first local memory byte.
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*
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* So as long as data is allocated using dma_alloc_coherent() all is
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* fine. This is however not always the case - buffers may be allocated
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* using kmalloc() - so the usb core needs to be told that it must copy
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* data into our local memory if the buffers happen to be placed in
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* regular memory. The HCD_LOCAL_MEM flag does just that.
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*/
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if (!dma_declare_coherent_memory(dev, mem->start,
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mem->start - mem->parent->start,
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(mem->end - mem->start) + 1,
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DMA_MEMORY_MAP |
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DMA_MEMORY_EXCLUSIVE)) {
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dev_err(dev, "cannot declare coherent memory\n");
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retval = -ENXIO;
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goto err1;
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}
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/* allocate, reserve and remap resources for registers */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(dev, "no resource definition for registers\n");
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retval = -ENOENT;
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goto err2;
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}
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hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
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if (!hcd) {
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retval = -ENOMEM;
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goto err2;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = res->end - res->start + 1;
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
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dev_err(dev, "request_mem_region failed\n");
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retval = -EBUSY;
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goto err3;
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}
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hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
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if (hcd->regs == NULL) {
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dev_err(dev, "cannot remap registers\n");
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retval = -ENXIO;
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goto err4;
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}
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ohci_hcd_init(hcd_to_ohci(hcd));
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retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
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if (retval)
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goto err4;
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/* enable power and unmask interrupts */
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sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
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sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
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return 0;
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err4:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err3:
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usb_put_hcd(hcd);
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err2:
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dma_release_declared_memory(dev);
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err1:
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release_mem_region(mem->start, mem->end - mem->start + 1);
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err0:
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return retval;
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}
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static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct resource *mem;
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usb_remove_hcd(hcd);
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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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dma_release_declared_memory(&pdev->dev);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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release_mem_region(mem->start, mem->end - mem->start + 1);
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/* mask interrupts and disable power */
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sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
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sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_PM
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static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
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{
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struct device *dev = &pdev->dev;
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struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev));
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
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ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
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dev->power.power_state = PMSG_SUSPEND;
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return 0;
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}
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static int ohci_sm501_resume(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(pdev));
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if (time_before(jiffies, ohci->next_statechange))
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msleep(5);
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ohci->next_statechange = jiffies;
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sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
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dev->power.power_state = PMSG_ON;
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usb_hcd_resume_root_hub(platform_get_drvdata(pdev));
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return 0;
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}
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#endif
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/*-------------------------------------------------------------------------*/
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/*
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* Driver definition to register with the SM501 bus
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*/
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static struct platform_driver ohci_hcd_sm501_driver = {
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.probe = ohci_hcd_sm501_drv_probe,
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.remove = ohci_hcd_sm501_drv_remove,
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.shutdown = usb_hcd_platform_shutdown,
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#ifdef CONFIG_PM
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.suspend = ohci_sm501_suspend,
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.resume = ohci_sm501_resume,
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#endif
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.driver = {
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.owner = THIS_MODULE,
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.name = "sm501-usb",
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},
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};
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