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1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3  * OHCI HCD (Host Controller Driver) for USB.
4  *
5  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
6  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7  * (C) Copyright 2002 Hewlett-Packard Company
8  *
9  * SA1111 Bus Glue
10  *
11  * Written by Christopher Hoover <ch@hpl.hp.com>
12  * Based on fragments of previous driver by Russell King et al.
13  *
14  * This file is licenced under the GPL.
15  */
16 
17 #include <asm/mach-types.h>
18 #include <asm/hardware/sa1111.h>
19 
20 #ifndef CONFIG_SA1111
21 #error "This file is SA-1111 bus glue.  CONFIG_SA1111 must be defined."
22 #endif
23 
24 #define USB_STATUS	0x0118
25 #define USB_RESET	0x011c
26 #define USB_IRQTEST	0x0120
27 
28 #define USB_RESET_FORCEIFRESET	(1 << 0)
29 #define USB_RESET_FORCEHCRESET	(1 << 1)
30 #define USB_RESET_CLKGENRESET	(1 << 2)
31 #define USB_RESET_SIMSCALEDOWN	(1 << 3)
32 #define USB_RESET_USBINTTEST	(1 << 4)
33 #define USB_RESET_SLEEPSTBYEN	(1 << 5)
34 #define USB_RESET_PWRSENSELOW	(1 << 6)
35 #define USB_RESET_PWRCTRLLOW	(1 << 7)
36 
37 #define USB_STATUS_IRQHCIRMTWKUP  (1 <<  7)
38 #define USB_STATUS_IRQHCIBUFFACC  (1 <<  8)
39 #define USB_STATUS_NIRQHCIM       (1 <<  9)
40 #define USB_STATUS_NHCIMFCLR      (1 << 10)
41 #define USB_STATUS_USBPWRSENSE    (1 << 11)
42 
43 #if 0
44 static void dump_hci_status(struct usb_hcd *hcd, const char *label)
45 {
46 	unsigned long status = readl_relaxed(hcd->regs + USB_STATUS);
47 
48 	printk(KERN_DEBUG "%s USB_STATUS = { %s%s%s%s%s}\n", label,
49 	     ((status & USB_STATUS_IRQHCIRMTWKUP) ? "IRQHCIRMTWKUP " : ""),
50 	     ((status & USB_STATUS_IRQHCIBUFFACC) ? "IRQHCIBUFFACC " : ""),
51 	     ((status & USB_STATUS_NIRQHCIM) ? "" : "IRQHCIM "),
52 	     ((status & USB_STATUS_NHCIMFCLR) ? "" : "HCIMFCLR "),
53 	     ((status & USB_STATUS_USBPWRSENSE) ? "USBPWRSENSE " : ""));
54 }
55 #endif
56 
ohci_sa1111_reset(struct usb_hcd * hcd)57 static int ohci_sa1111_reset(struct usb_hcd *hcd)
58 {
59 	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
60 
61 	ohci_hcd_init(ohci);
62 	return ohci_init(ohci);
63 }
64 
ohci_sa1111_start(struct usb_hcd * hcd)65 static int ohci_sa1111_start(struct usb_hcd *hcd)
66 {
67 	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
68 	int ret;
69 
70 	ret = ohci_run(ohci);
71 	if (ret < 0) {
72 		ohci_err(ohci, "can't start\n");
73 		ohci_stop(hcd);
74 	}
75 	return ret;
76 }
77 
78 static const struct hc_driver ohci_sa1111_hc_driver = {
79 	.description =		hcd_name,
80 	.product_desc =		"SA-1111 OHCI",
81 	.hcd_priv_size =	sizeof(struct ohci_hcd),
82 
83 	/*
84 	 * generic hardware linkage
85 	 */
86 	.irq =			ohci_irq,
87 	.flags =		HCD_USB11 | HCD_DMA | HCD_MEMORY,
88 
89 	/*
90 	 * basic lifecycle operations
91 	 */
92 	.reset =		ohci_sa1111_reset,
93 	.start =		ohci_sa1111_start,
94 	.stop =			ohci_stop,
95 	.shutdown =		ohci_shutdown,
96 
97 	/*
98 	 * managing i/o requests and associated device resources
99 	 */
100 	.urb_enqueue =		ohci_urb_enqueue,
101 	.urb_dequeue =		ohci_urb_dequeue,
102 	.endpoint_disable =	ohci_endpoint_disable,
103 
104 	/*
105 	 * scheduling support
106 	 */
107 	.get_frame_number =	ohci_get_frame,
108 
109 	/*
110 	 * root hub support
111 	 */
112 	.hub_status_data =	ohci_hub_status_data,
113 	.hub_control =		ohci_hub_control,
114 #ifdef	CONFIG_PM
115 	.bus_suspend =		ohci_bus_suspend,
116 	.bus_resume =		ohci_bus_resume,
117 #endif
118 	.start_port_reset =	ohci_start_port_reset,
119 };
120 
sa1111_start_hc(struct sa1111_dev * dev)121 static int sa1111_start_hc(struct sa1111_dev *dev)
122 {
123 	unsigned int usb_rst = 0;
124 	int ret;
125 
126 	dev_dbg(&dev->dev, "starting SA-1111 OHCI USB Controller\n");
127 
128 	if (machine_is_xp860() ||
129 	    machine_is_assabet() ||
130 	    machine_is_pfs168() ||
131 	    machine_is_badge4())
132 		usb_rst = USB_RESET_PWRSENSELOW | USB_RESET_PWRCTRLLOW;
133 
134 	/*
135 	 * Configure the power sense and control lines.  Place the USB
136 	 * host controller in reset.
137 	 */
138 	writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
139 		      dev->mapbase + USB_RESET);
140 
141 	/*
142 	 * Now, carefully enable the USB clock, and take
143 	 * the USB host controller out of reset.
144 	 */
145 	ret = sa1111_enable_device(dev);
146 	if (ret == 0) {
147 		udelay(11);
148 		writel_relaxed(usb_rst, dev->mapbase + USB_RESET);
149 	}
150 
151 	return ret;
152 }
153 
sa1111_stop_hc(struct sa1111_dev * dev)154 static void sa1111_stop_hc(struct sa1111_dev *dev)
155 {
156 	unsigned int usb_rst;
157 
158 	dev_dbg(&dev->dev, "stopping SA-1111 OHCI USB Controller\n");
159 
160 	/*
161 	 * Put the USB host controller into reset.
162 	 */
163 	usb_rst = readl_relaxed(dev->mapbase + USB_RESET);
164 	writel_relaxed(usb_rst | USB_RESET_FORCEIFRESET | USB_RESET_FORCEHCRESET,
165 		      dev->mapbase + USB_RESET);
166 
167 	/*
168 	 * Stop the USB clock.
169 	 */
170 	sa1111_disable_device(dev);
171 }
172 
173 /**
174  * ohci_hcd_sa1111_probe - initialize SA-1111-based HCDs
175  *
176  * Allocates basic resources for this USB host controller, and
177  * then invokes the start() method for the HCD associated with it.
178  */
ohci_hcd_sa1111_probe(struct sa1111_dev * dev)179 static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev)
180 {
181 	struct usb_hcd *hcd;
182 	int ret, irq;
183 
184 	if (usb_disabled())
185 		return -ENODEV;
186 
187 	/*
188 	 * We don't call dma_set_mask_and_coherent() here because the
189 	 * DMA mask has already been appropraitely setup by the core
190 	 * SA-1111 bus code (which includes bug workarounds.)
191 	 */
192 
193 	hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111");
194 	if (!hcd)
195 		return -ENOMEM;
196 
197 	hcd->rsrc_start = dev->res.start;
198 	hcd->rsrc_len = resource_size(&dev->res);
199 
200 	irq = sa1111_get_irq(dev, 1);
201 	if (irq <= 0) {
202 		ret = irq ? : -ENXIO;
203 		goto err1;
204 	}
205 
206 	/*
207 	 * According to the "Intel StrongARM SA-1111 Microprocessor Companion
208 	 * Chip Specification Update" (June 2000), erratum #7, there is a
209 	 * significant bug in the SA1111 SDRAM shared memory controller.  If
210 	 * an access to a region of memory above 1MB relative to the bank base,
211 	 * it is important that address bit 10 _NOT_ be asserted. Depending
212 	 * on the configuration of the RAM, bit 10 may correspond to one
213 	 * of several different (processor-relative) address bits.
214 	 *
215 	 * Section 4.6 of the "Intel StrongARM SA-1111 Development Module
216 	 * User's Guide" mentions that jumpers R51 and R52 control the
217 	 * target of SA-1111 DMA (either SDRAM bank 0 on Assabet, or
218 	 * SDRAM bank 1 on Neponset). The default configuration selects
219 	 * Assabet, so any address in bank 1 is necessarily invalid.
220 	 *
221 	 * As a workaround, use a bounce buffer in addressable memory
222 	 * as local_mem, relying on ZONE_DMA to provide an area that
223 	 * fits within the above constraints.
224 	 *
225 	 * SZ_64K is an estimate for what size this might need.
226 	 */
227 	ret = usb_hcd_setup_local_mem(hcd, 0, 0, SZ_64K);
228 	if (ret)
229 		goto err1;
230 
231 	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
232 		dev_dbg(&dev->dev, "request_mem_region failed\n");
233 		ret = -EBUSY;
234 		goto err1;
235 	}
236 
237 	hcd->regs = dev->mapbase;
238 
239 	ret = sa1111_start_hc(dev);
240 	if (ret)
241 		goto err2;
242 
243 	ret = usb_add_hcd(hcd, irq, 0);
244 	if (ret == 0) {
245 		device_wakeup_enable(hcd->self.controller);
246 		return ret;
247 	}
248 
249 	sa1111_stop_hc(dev);
250  err2:
251 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
252  err1:
253 	usb_put_hcd(hcd);
254 	return ret;
255 }
256 
257 /**
258  * ohci_hcd_sa1111_remove - shutdown processing for SA-1111-based HCDs
259  * @dev: USB Host Controller being removed
260  *
261  * Reverses the effect of ohci_hcd_sa1111_probe(), first invoking
262  * the HCD's stop() method.
263  */
ohci_hcd_sa1111_remove(struct sa1111_dev * dev)264 static void ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
265 {
266 	struct usb_hcd *hcd = sa1111_get_drvdata(dev);
267 
268 	usb_remove_hcd(hcd);
269 	sa1111_stop_hc(dev);
270 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
271 	usb_put_hcd(hcd);
272 }
273 
ohci_hcd_sa1111_shutdown(struct device * _dev)274 static void ohci_hcd_sa1111_shutdown(struct device *_dev)
275 {
276 	struct sa1111_dev *dev = to_sa1111_device(_dev);
277 	struct usb_hcd *hcd = sa1111_get_drvdata(dev);
278 
279 	if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
280 		hcd->driver->shutdown(hcd);
281 		sa1111_stop_hc(dev);
282 	}
283 }
284 
285 static struct sa1111_driver ohci_hcd_sa1111_driver = {
286 	.drv = {
287 		.name	= "sa1111-ohci",
288 		.owner	= THIS_MODULE,
289 		.shutdown = ohci_hcd_sa1111_shutdown,
290 	},
291 	.devid		= SA1111_DEVID_USB,
292 	.probe		= ohci_hcd_sa1111_probe,
293 	.remove		= ohci_hcd_sa1111_remove,
294 };
295