tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * EHCI HCD (Host Controller Driver) for USB.
3 *
4 * Bus Glue for AMD Alchemy Au1xxx
5 *
6 * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
7 *
8 * Modified for AMD Alchemy Au1200 EHC
9 * by K.Boge <karsten.boge@amd.com>
10 *
11 * This file is licenced under the GPL.
12 */
13
14#include <linux/platform_device.h>
15#include <asm/mach-au1x00/au1000.h>
16
17#define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG)
18#define USB_MCFG_PFEN (1<<31)
19#define USB_MCFG_RDCOMB (1<<30)
20#define USB_MCFG_SSDEN (1<<23)
21#define USB_MCFG_PHYPLLEN (1<<19)
22#define USB_MCFG_EHCCLKEN (1<<17)
23#define USB_MCFG_UCAM (1<<7)
24#define USB_MCFG_EBMEN (1<<3)
25#define USB_MCFG_EMEMEN (1<<2)
26
27#define USBH_ENABLE_CE (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
28
29#ifdef CONFIG_DMA_COHERENT
30#define USBH_ENABLE_INIT (USBH_ENABLE_CE \
31 | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
32 | USB_MCFG_SSDEN | USB_MCFG_UCAM \
33 | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
34#else
35#define USBH_ENABLE_INIT (USBH_ENABLE_CE \
36 | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
37 | USB_MCFG_SSDEN \
38 | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
39#endif
40#define USBH_DISABLE (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
41
42extern int usb_disabled(void);
43
44/*-------------------------------------------------------------------------*/
45
46static void au1xxx_start_ehc(struct platform_device *dev)
47{
48 pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
49
50 /* write HW defaults again in case Yamon cleared them */
51 if (au_readl(USB_HOST_CONFIG) == 0) {
52 au_writel(0x00d02000, USB_HOST_CONFIG);
53 au_readl(USB_HOST_CONFIG);
54 udelay(1000);
55 }
56 /* enable host controller */
57 au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
58 au_readl(USB_HOST_CONFIG);
59 udelay(1000);
60 au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
61 USB_HOST_CONFIG);
62 au_readl(USB_HOST_CONFIG);
63 udelay(1000);
64
65 pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
66}
67
68static void au1xxx_stop_ehc(struct platform_device *dev)
69{
70 pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
71
72 /* Disable mem */
73 au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
74 udelay(1000);
75 /* Disable clock */
76 au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
77 USB_HOST_CONFIG);
78 au_readl(USB_HOST_CONFIG);
79}
80
81/*-------------------------------------------------------------------------*/
82
83/* configure so an HC device and id are always provided */
84/* always called with process context; sleeping is OK */
85
86/**
87 * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
88 * Context: !in_interrupt()
89 *
90 * Allocates basic resources for this USB host controller, and
91 * then invokes the start() method for the HCD associated with it
92 * through the hotplug entry's driver_data.
93 *
94 */
95int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
96 struct usb_hcd **hcd_out, struct platform_device *dev)
97{
98 int retval;
99 struct usb_hcd *hcd;
100 struct ehci_hcd *ehci;
101
102#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
103
104 /* Au1200 AB USB does not support coherent memory */
105 if (!(read_c0_prid() & 0xff)) {
106 pr_info("%s: this is chip revision AB!\n", dev->name);
107 pr_info("%s: update your board or re-configure the kernel\n",
108 dev->name);
109 return -ENODEV;
110 }
111#endif
112
113 au1xxx_start_ehc(dev);
114
115 if (dev->resource[1].flags != IORESOURCE_IRQ) {
116 pr_debug("resource[1] is not IORESOURCE_IRQ");
117 retval = -ENOMEM;
118 }
119 hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
120 if (!hcd)
121 return -ENOMEM;
122 hcd->rsrc_start = dev->resource[0].start;
123 hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
124
125 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
126 pr_debug("request_mem_region failed");
127 retval = -EBUSY;
128 goto err1;
129 }
130
131 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
132 if (!hcd->regs) {
133 pr_debug("ioremap failed");
134 retval = -ENOMEM;
135 goto err2;
136 }
137
138 ehci = hcd_to_ehci(hcd);
139 ehci->caps = hcd->regs;
140 ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
141 /* cache this readonly data; minimize chip reads */
142 ehci->hcs_params = readl(&ehci->caps->hcs_params);
143
144 /* ehci_hcd_init(hcd_to_ehci(hcd)); */
145
146 retval =
147 usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
148 if (retval == 0)
149 return retval;
150
151 au1xxx_stop_ehc(dev);
152 iounmap(hcd->regs);
153err2:
154 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
155err1:
156 usb_put_hcd(hcd);
157 return retval;
158}
159
160/* may be called without controller electrically present */
161/* may be called with controller, bus, and devices active */
162
163/**
164 * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
165 * @dev: USB Host Controller being removed
166 * Context: !in_interrupt()
167 *
168 * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
169 * the HCD's stop() method. It is always called from a thread
170 * context, normally "rmmod", "apmd", or something similar.
171 *
172 */
173void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
174{
175 usb_remove_hcd(hcd);
176 iounmap(hcd->regs);
177 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
178 usb_put_hcd(hcd);
179 au1xxx_stop_ehc(dev);
180}
181
182/*-------------------------------------------------------------------------*/
183
184static const struct hc_driver ehci_au1xxx_hc_driver = {
185 .description = hcd_name,
186 .product_desc = "Au1xxx EHCI",
187 .hcd_priv_size = sizeof(struct ehci_hcd),
188
189 /*
190 * generic hardware linkage
191 */
192 .irq = ehci_irq,
193 .flags = HCD_MEMORY | HCD_USB2,
194
195 /*
196 * basic lifecycle operations
197 *
198 * FIXME -- ehci_init() doesn't do enough here.
199 * See ehci-ppc-soc for a complete implementation.
200 */
201 .reset = ehci_init,
202 .start = ehci_run,
203 .stop = ehci_stop,
204 .shutdown = ehci_shutdown,
205
206 /*
207 * managing i/o requests and associated device resources
208 */
209 .urb_enqueue = ehci_urb_enqueue,
210 .urb_dequeue = ehci_urb_dequeue,
211 .endpoint_disable = ehci_endpoint_disable,
212
213 /*
214 * scheduling support
215 */
216 .get_frame_number = ehci_get_frame,
217
218 /*
219 * root hub support
220 */
221 .hub_status_data = ehci_hub_status_data,
222 .hub_control = ehci_hub_control,
223 .bus_suspend = ehci_bus_suspend,
224 .bus_resume = ehci_bus_resume,
225 .relinquish_port = ehci_relinquish_port,
226 .port_handed_over = ehci_port_handed_over,
227};
228
229/*-------------------------------------------------------------------------*/
230
231static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
232{
233 struct usb_hcd *hcd = NULL;
234 int ret;
235
236 pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
237
238 if (usb_disabled())
239 return -ENODEV;
240
241 /* FIXME we only want one one probe() not two */
242 ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
243 return ret;
244}
245
246static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
247{
248 struct usb_hcd *hcd = platform_get_drvdata(pdev);
249
250 /* FIXME we only want one one remove() not two */
251 usb_ehci_au1xxx_remove(hcd, pdev);
252 return 0;
253}
254
255 /*TBD*/
256/*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
257{
258 struct platform_device *pdev = to_platform_device(dev);
259 struct usb_hcd *hcd = dev_get_drvdata(dev);
260
261 return 0;
262}
263static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
264{
265 struct platform_device *pdev = to_platform_device(dev);
266 struct usb_hcd *hcd = dev_get_drvdata(dev);
267
268 return 0;
269}
270*/
271MODULE_ALIAS("platform:au1xxx-ehci");
272static struct platform_driver ehci_hcd_au1xxx_driver = {
273 .probe = ehci_hcd_au1xxx_drv_probe,
274 .remove = ehci_hcd_au1xxx_drv_remove,
275 .shutdown = usb_hcd_platform_shutdown,
276 /*.suspend = ehci_hcd_au1xxx_drv_suspend, */
277 /*.resume = ehci_hcd_au1xxx_drv_resume, */
278 .driver = {
279 .name = "au1xxx-ehci",
280 }
281};