2 * OHCI HCD (Host Controller Driver) for USB.
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2005 David Brownell
6 * (C) Copyright 2002 Hewlett-Packard Company
7 * (C) Copyright 2008 Magnus Damm
9 * SM501 Bus Glue - based on ohci-omap.c
11 * This file is licenced under the GPL.
14 #include <linux/interrupt.h>
15 #include <linux/jiffies.h>
16 #include <linux/platform_device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/sm501.h>
19 #include <linux/sm501-regs.h>
21 static int ohci_sm501_init(struct usb_hcd *hcd)
23 return ohci_init(hcd_to_ohci(hcd));
26 static int ohci_sm501_start(struct usb_hcd *hcd)
28 struct device *dev = hcd->self.controller;
31 ret = ohci_run(hcd_to_ohci(hcd));
33 dev_err(dev, "can't start %s", hcd->self.bus_name);
40 /*-------------------------------------------------------------------------*/
42 static const struct hc_driver ohci_sm501_hc_driver = {
43 .description = hcd_name,
44 .product_desc = "SM501 OHCI",
45 .hcd_priv_size = sizeof(struct ohci_hcd),
48 * generic hardware linkage
51 .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM,
54 * basic lifecycle operations
56 .reset = ohci_sm501_init,
57 .start = ohci_sm501_start,
59 .shutdown = ohci_shutdown,
62 * managing i/o requests and associated device resources
64 .urb_enqueue = ohci_urb_enqueue,
65 .urb_dequeue = ohci_urb_dequeue,
66 .endpoint_disable = ohci_endpoint_disable,
71 .get_frame_number = ohci_get_frame,
76 .hub_status_data = ohci_hub_status_data,
77 .hub_control = ohci_hub_control,
79 .bus_suspend = ohci_bus_suspend,
80 .bus_resume = ohci_bus_resume,
82 .start_port_reset = ohci_start_port_reset,
85 /*-------------------------------------------------------------------------*/
87 static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
89 const struct hc_driver *driver = &ohci_sm501_hc_driver;
90 struct device *dev = &pdev->dev;
91 struct resource *res, *mem;
93 struct usb_hcd *hcd = NULL;
95 irq = retval = platform_get_irq(pdev, 0);
99 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
101 dev_err(dev, "no resource definition for memory\n");
106 if (!request_mem_region(mem->start, resource_size(mem), pdev->name)) {
107 dev_err(dev, "request_mem_region failed\n");
112 /* The sm501 chip is equipped with local memory that may be used
113 * by on-chip devices such as the video controller and the usb host.
114 * This driver uses dma_declare_coherent_memory() to make sure
115 * usb allocations with dma_alloc_coherent() allocate from
116 * this local memory. The dma_handle returned by dma_alloc_coherent()
117 * will be an offset starting from 0 for the first local memory byte.
119 * So as long as data is allocated using dma_alloc_coherent() all is
120 * fine. This is however not always the case - buffers may be allocated
121 * using kmalloc() - so the usb core needs to be told that it must copy
122 * data into our local memory if the buffers happen to be placed in
123 * regular memory. The HCD_LOCAL_MEM flag does just that.
126 retval = dma_declare_coherent_memory(dev, mem->start,
127 mem->start - mem->parent->start,
129 DMA_MEMORY_EXCLUSIVE);
131 dev_err(dev, "cannot declare coherent memory\n");
135 /* allocate, reserve and remap resources for registers */
136 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
138 dev_err(dev, "no resource definition for registers\n");
143 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
149 hcd->rsrc_start = res->start;
150 hcd->rsrc_len = resource_size(res);
152 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) {
153 dev_err(dev, "request_mem_region failed\n");
158 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
159 if (hcd->regs == NULL) {
160 dev_err(dev, "cannot remap registers\n");
165 ohci_hcd_init(hcd_to_ohci(hcd));
167 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
170 device_wakeup_enable(hcd->self.controller);
172 /* enable power and unmask interrupts */
174 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
175 sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
181 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
185 dma_release_declared_memory(dev);
187 release_mem_region(mem->start, resource_size(mem));
192 static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev)
194 struct usb_hcd *hcd = platform_get_drvdata(pdev);
195 struct resource *mem;
198 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
200 dma_release_declared_memory(&pdev->dev);
201 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
203 release_mem_region(mem->start, resource_size(mem));
205 /* mask interrupts and disable power */
207 sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);
208 sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0);
213 /*-------------------------------------------------------------------------*/
216 static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg)
218 struct device *dev = &pdev->dev;
219 struct usb_hcd *hcd = platform_get_drvdata(pdev);
220 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
221 bool do_wakeup = device_may_wakeup(dev);
224 if (time_before(jiffies, ohci->next_statechange))
226 ohci->next_statechange = jiffies;
228 ret = ohci_suspend(hcd, do_wakeup);
232 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0);
236 static int ohci_sm501_resume(struct platform_device *pdev)
238 struct device *dev = &pdev->dev;
239 struct usb_hcd *hcd = platform_get_drvdata(pdev);
240 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
242 if (time_before(jiffies, ohci->next_statechange))
244 ohci->next_statechange = jiffies;
246 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1);
247 ohci_resume(hcd, false);
251 #define ohci_sm501_suspend NULL
252 #define ohci_sm501_resume NULL
255 /*-------------------------------------------------------------------------*/
258 * Driver definition to register with the SM501 bus
260 static struct platform_driver ohci_hcd_sm501_driver = {
261 .probe = ohci_hcd_sm501_drv_probe,
262 .remove = ohci_hcd_sm501_drv_remove,
263 .shutdown = usb_hcd_platform_shutdown,
264 .suspend = ohci_sm501_suspend,
265 .resume = ohci_sm501_resume,
270 MODULE_ALIAS("platform:sm501-usb");