ux500.c 9.35 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*
 * Copyright (C) 2010 ST-Ericsson AB
 * Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
 *
 * Based on omap2430.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/clk.h>
25
#include <linux/err.h>
26
#include <linux/io.h>
27
#include <linux/of.h>
28
#include <linux/platform_device.h>
29
#include <linux/usb/musb-ux500.h>
30 31 32

#include "musb_core.h"

33 34 35 36 37 38 39
static struct musb_hdrc_config ux500_musb_hdrc_config = {
	.multipoint	= true,
	.dyn_fifo	= true,
	.num_eps	= 16,
	.ram_bits	= 16,
};

40 41 42 43 44 45 46
struct ux500_glue {
	struct device		*dev;
	struct platform_device	*musb;
	struct clk		*clk;
};
#define glue_to_musb(g)	platform_get_drvdata(g->musb)

47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108
static void ux500_musb_set_vbus(struct musb *musb, int is_on)
{
	u8            devctl;
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	/* HDRC controls CPEN, but beware current surges during device
	 * connect.  They can trigger transient overcurrent conditions
	 * that must be ignored.
	 */

	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);

	if (is_on) {
		if (musb->xceiv->state == OTG_STATE_A_IDLE) {
			/* start the session */
			devctl |= MUSB_DEVCTL_SESSION;
			musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
			/*
			 * Wait for the musb to set as A device to enable the
			 * VBUS
			 */
			while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) {

				if (time_after(jiffies, timeout)) {
					dev_err(musb->controller,
					"configured as A device timeout");
					break;
				}
			}

		} else {
			musb->is_active = 1;
			musb->xceiv->otg->default_a = 1;
			musb->xceiv->state = OTG_STATE_A_WAIT_VRISE;
			devctl |= MUSB_DEVCTL_SESSION;
			MUSB_HST_MODE(musb);
		}
	} else {
		musb->is_active = 0;

		/* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and jumping
		 * right to B_IDLE...
		 */
		musb->xceiv->otg->default_a = 0;
		devctl &= ~MUSB_DEVCTL_SESSION;
		MUSB_DEV_MODE(musb);
	}
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);

	/*
	 * Devctl values will be updated after vbus goes below
	 * session_valid. The time taken depends on the capacitance
	 * on VBUS line. The max discharge time can be upto 1 sec
	 * as per the spec. Typically on our platform, it is 200ms
	 */
	if (!is_on)
		mdelay(200);

	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",
		usb_otg_state_string(musb->xceiv->state),
		musb_readb(musb->mregs, MUSB_DEVCTL));
}

109 110 111 112 113 114 115 116 117
static int musb_otg_notifications(struct notifier_block *nb,
		unsigned long event, void *unused)
{
	struct musb *musb = container_of(nb, struct musb, nb);

	dev_dbg(musb->controller, "musb_otg_notifications %ld %s\n",
			event, usb_otg_state_string(musb->xceiv->state));

	switch (event) {
118
	case UX500_MUSB_ID:
119 120 121
		dev_dbg(musb->controller, "ID GND\n");
		ux500_musb_set_vbus(musb, 1);
		break;
122
	case UX500_MUSB_VBUS:
123 124
		dev_dbg(musb->controller, "VBUS Connect\n");
		break;
125
	case UX500_MUSB_NONE:
126 127 128 129 130 131 132 133 134 135 136 137 138
		dev_dbg(musb->controller, "VBUS Disconnect\n");
		if (is_host_active(musb))
			ux500_musb_set_vbus(musb, 0);
		else
			musb->xceiv->state = OTG_STATE_B_IDLE;
		break;
	default:
		dev_dbg(musb->controller, "ID float\n");
		return NOTIFY_DONE;
	}
	return NOTIFY_OK;
}

139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
{
	unsigned long   flags;
	irqreturn_t     retval = IRQ_NONE;
	struct musb     *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);

	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);

	if (musb->int_usb || musb->int_tx || musb->int_rx)
		retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
}

159 160
static int ux500_musb_init(struct musb *musb)
{
161 162
	int status;

163
	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
164
	if (IS_ERR_OR_NULL(musb->xceiv)) {
165
		pr_err("HS USB OTG: no transceiver configured\n");
166
		return -EPROBE_DEFER;
167 168
	}

169 170 171 172 173 174 175
	musb->nb.notifier_call = musb_otg_notifications;
	status = usb_register_notifier(musb->xceiv, &musb->nb);
	if (status < 0) {
		dev_dbg(musb->controller, "notification register failed\n");
		return status;
	}

176 177
	musb->isr = ux500_musb_interrupt;

178 179 180 181 182
	return 0;
}

static int ux500_musb_exit(struct musb *musb)
{
183 184
	usb_unregister_notifier(musb->xceiv, &musb->nb);

185
	usb_put_phy(musb->xceiv);
186 187 188 189 190 191 192

	return 0;
}

static const struct musb_platform_ops ux500_ops = {
	.init		= ux500_musb_init,
	.exit		= ux500_musb_exit,
193 194

	.set_vbus	= ux500_musb_set_vbus,
195 196
};

197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225
static struct musb_hdrc_platform_data *
ux500_of_probe(struct platform_device *pdev, struct device_node *np)
{
	struct musb_hdrc_platform_data *pdata;
	const char *mode;
	int strlen;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	mode = of_get_property(np, "dr_mode", &strlen);
	if (!mode) {
		dev_err(&pdev->dev, "No 'dr_mode' property found\n");
		return NULL;
	}

	if (strlen > 0) {
		if (!strcmp(mode, "host"))
			pdata->mode = MUSB_HOST;
		if (!strcmp(mode, "otg"))
			pdata->mode = MUSB_OTG;
		if (!strcmp(mode, "peripheral"))
			pdata->mode = MUSB_PERIPHERAL;
	}

	return pdata;
}

Bill Pemberton's avatar
Bill Pemberton committed
226
static int ux500_probe(struct platform_device *pdev)
227
{
228
	struct resource musb_resources[2];
Jingoo Han's avatar
Jingoo Han committed
229
	struct musb_hdrc_platform_data	*pdata = dev_get_platdata(&pdev->dev);
230
	struct device_node		*np = pdev->dev.of_node;
231 232 233 234 235
	struct platform_device		*musb;
	struct ux500_glue		*glue;
	struct clk			*clk;
	int				ret = -ENOMEM;

236 237 238 239 240 241 242 243 244 245 246 247 248
	if (!pdata) {
		if (np) {
			pdata = ux500_of_probe(pdev, np);
			if (!pdata)
				goto err0;

			pdev->dev.platform_data = pdata;
		} else {
			dev_err(&pdev->dev, "no pdata or device tree found\n");
			goto err0;
		}
	}

249 250 251 252 253 254
	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
		dev_err(&pdev->dev, "failed to allocate glue context\n");
		goto err0;
	}

255
	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
256 257
	if (!musb) {
		dev_err(&pdev->dev, "failed to allocate musb device\n");
258
		goto err1;
259 260
	}

261
	clk = clk_get(&pdev->dev, NULL);
262 263 264
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		ret = PTR_ERR(clk);
265
		goto err3;
266 267
	}

268
	ret = clk_prepare_enable(clk);
269 270
	if (ret) {
		dev_err(&pdev->dev, "failed to enable clock\n");
271
		goto err4;
272 273 274
	}

	musb->dev.parent		= &pdev->dev;
275
	musb->dev.dma_mask		= &pdev->dev.coherent_dma_mask;
276
	musb->dev.coherent_dma_mask	= pdev->dev.coherent_dma_mask;
277 278 279 280 281 282

	glue->dev			= &pdev->dev;
	glue->musb			= musb;
	glue->clk			= clk;

	pdata->platform_ops		= &ux500_ops;
283
	pdata->config 			= &ux500_musb_hdrc_config;
284 285 286

	platform_set_drvdata(pdev, glue);

287 288 289 290 291 292 293 294 295 296 297 298 299 300 301
	memset(musb_resources, 0x00, sizeof(*musb_resources) *
			ARRAY_SIZE(musb_resources));

	musb_resources[0].name = pdev->resource[0].name;
	musb_resources[0].start = pdev->resource[0].start;
	musb_resources[0].end = pdev->resource[0].end;
	musb_resources[0].flags = pdev->resource[0].flags;

	musb_resources[1].name = pdev->resource[1].name;
	musb_resources[1].start = pdev->resource[1].start;
	musb_resources[1].end = pdev->resource[1].end;
	musb_resources[1].flags = pdev->resource[1].flags;

	ret = platform_device_add_resources(musb, musb_resources,
			ARRAY_SIZE(musb_resources));
302 303
	if (ret) {
		dev_err(&pdev->dev, "failed to add resources\n");
304
		goto err5;
305 306 307 308 309
	}

	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
	if (ret) {
		dev_err(&pdev->dev, "failed to add platform_data\n");
310
		goto err5;
311 312 313 314 315
	}

	ret = platform_device_add(musb);
	if (ret) {
		dev_err(&pdev->dev, "failed to register musb device\n");
316
		goto err5;
317 318 319 320
	}

	return 0;

321
err5:
322
	clk_disable_unprepare(clk);
323

324
err4:
325 326
	clk_put(clk);

327
err3:
328 329 330 331 332 333 334 335 336
	platform_device_put(musb);

err1:
	kfree(glue);

err0:
	return ret;
}

Bill Pemberton's avatar
Bill Pemberton committed
337
static int ux500_remove(struct platform_device *pdev)
338 339 340
{
	struct ux500_glue	*glue = platform_get_drvdata(pdev);

341
	platform_device_unregister(glue->musb);
342
	clk_disable_unprepare(glue->clk);
343 344 345 346 347 348 349 350 351 352 353 354
	clk_put(glue->clk);
	kfree(glue);

	return 0;
}

#ifdef CONFIG_PM
static int ux500_suspend(struct device *dev)
{
	struct ux500_glue	*glue = dev_get_drvdata(dev);
	struct musb		*musb = glue_to_musb(glue);

355
	usb_phy_set_suspend(musb->xceiv, 1);
356
	clk_disable_unprepare(glue->clk);
357 358 359 360 361 362 363 364 365 366

	return 0;
}

static int ux500_resume(struct device *dev)
{
	struct ux500_glue	*glue = dev_get_drvdata(dev);
	struct musb		*musb = glue_to_musb(glue);
	int			ret;

367
	ret = clk_prepare_enable(glue->clk);
368 369 370 371 372
	if (ret) {
		dev_err(dev, "failed to enable clock\n");
		return ret;
	}

373
	usb_phy_set_suspend(musb->xceiv, 0);
374 375 376 377 378

	return 0;
}
#endif

379 380
static SIMPLE_DEV_PM_OPS(ux500_pm_ops, ux500_suspend, ux500_resume);

381 382 383 384 385
static const struct of_device_id ux500_match[] = {
        { .compatible = "stericsson,db8500-musb", },
        {}
};

386
static struct platform_driver ux500_driver = {
387
	.probe		= ux500_probe,
388
	.remove		= ux500_remove,
389 390
	.driver		= {
		.name	= "musb-ux500",
391
		.pm	= &ux500_pm_ops,
392
		.of_match_table = ux500_match,
393 394 395 396 397 398
	},
};

MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
MODULE_LICENSE("GPL v2");
399
module_platform_driver(ux500_driver);