summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ehci-orion.c
blob: bfcbb9aa8816bb5a4c84bef1d525ca8d086c8c66 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/*
 * drivers/usb/host/ehci-orion.c
 *
 * Tzachi Perelstein <tzachi@marvell.com>
 *
 * This file is licensed under  the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mbus.h>
#include <linux/clk.h>
#include <linux/platform_data/usb-ehci-orion.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>

#include "ehci.h"

#define rdl(off)	readl_relaxed(hcd->regs + (off))
#define wrl(off, val)	writel_relaxed((val), hcd->regs + (off))

#define USB_CMD			0x140
#define   USB_CMD_RUN		BIT(0)
#define   USB_CMD_RESET		BIT(1)
#define USB_MODE		0x1a8
#define   USB_MODE_MASK		GENMASK(1, 0)
#define   USB_MODE_DEVICE	0x2
#define   USB_MODE_HOST		0x3
#define   USB_MODE_SDIS		BIT(4)
#define USB_CAUSE		0x310
#define USB_MASK		0x314
#define USB_WINDOW_CTRL(i)	(0x320 + ((i) << 4))
#define USB_WINDOW_BASE(i)	(0x324 + ((i) << 4))
#define USB_IPG			0x360
#define USB_PHY_PWR_CTRL	0x400
#define USB_PHY_TX_CTRL		0x420
#define USB_PHY_RX_CTRL		0x430
#define USB_PHY_IVREF_CTRL	0x440
#define USB_PHY_TST_GRP_CTRL	0x450

#define DRIVER_DESC "EHCI orion driver"

#define hcd_to_orion_priv(h) ((struct orion_ehci_hcd *)hcd_to_ehci(h)->priv)

struct orion_ehci_hcd {
	struct clk *clk;
	struct phy *phy;
};

static const char hcd_name[] = "ehci-orion";

static struct hc_driver __read_mostly ehci_orion_hc_driver;

/*
 * Implement Orion USB controller specification guidelines
 */
static void orion_usb_phy_v1_setup(struct usb_hcd *hcd)
{
	/* The below GLs are according to the Orion Errata document */
	/*
	 * Clear interrupt cause and mask
	 */
	wrl(USB_CAUSE, 0);
	wrl(USB_MASK, 0);

	/*
	 * Reset controller
	 */
	wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
	while (rdl(USB_CMD) & USB_CMD_RESET);

	/*
	 * GL# USB-10: Set IPG for non start of frame packets
	 * Bits[14:8]=0xc
	 */
	wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);

	/*
	 * GL# USB-9: USB 2.0 Power Control
	 * BG_VSEL[7:6]=0x1
	 */
	wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);

	/*
	 * GL# USB-1: USB PHY Tx Control - force calibration to '8'
	 * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
	 */
	wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);

	/*
	 * GL# USB-3 GL# USB-9: USB PHY Rx Control
	 * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
	 * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
	 */
	wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);

	/*
	 * GL# USB-3 GL# USB-9: USB PHY IVREF Control
	 * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
	 */
	wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);

	/*
	 * GL# USB-3 GL# USB-9: USB PHY Test Group Control
	 * REG_FIFO_SQ_RST[15]=0
	 */
	wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);

	/*
	 * Stop and reset controller
	 */
	wrl(USB_CMD, rdl(USB_CMD) & ~USB_CMD_RUN);
	wrl(USB_CMD, rdl(USB_CMD) | USB_CMD_RESET);
	while (rdl(USB_CMD) & USB_CMD_RESET);

	/*
	 * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
	 * TBD: This need to be done after each reset!
	 * GL# USB-4 Setup USB Host mode
	 */
	wrl(USB_MODE, USB_MODE_SDIS | USB_MODE_HOST);
}

static void
ehci_orion_conf_mbus_windows(struct usb_hcd *hcd,
			     const struct mbus_dram_target_info *dram)
{
	int i;

	for (i = 0; i < 4; i++) {
		wrl(USB_WINDOW_CTRL(i), 0);
		wrl(USB_WINDOW_BASE(i), 0);
	}

	for (i = 0; i < dram->num_cs; i++) {
		const struct mbus_dram_window *cs = dram->cs + i;

		wrl(USB_WINDOW_CTRL(i), ((cs->size - 1) & 0xffff0000) |
					(cs->mbus_attr << 8) |
					(dram->mbus_dram_target_id << 4) | 1);
		wrl(USB_WINDOW_BASE(i), cs->base);
	}
}

static const struct ehci_driver_overrides orion_overrides __initconst = {
	.extra_priv_size =	sizeof(struct orion_ehci_hcd),
};

static int ehci_orion_drv_probe(struct platform_device *pdev)
{
	struct orion_ehci_data *pd = dev_get_platdata(&pdev->dev);
	const struct mbus_dram_target_info *dram;
	struct resource *res;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	void __iomem *regs;
	int irq, err;
	enum orion_ehci_phy_ver phy_version;
	struct orion_ehci_hcd *priv;

	if (usb_disabled())
		return -ENODEV;

	pr_debug("Initializing Orion-SoC USB Host Controller\n");

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_err(&pdev->dev,
			"Found HC with no IRQ. Check %s setup!\n",
			dev_name(&pdev->dev));
		err = -ENODEV;
		goto err;
	}

	/*
	 * Right now device-tree probed devices don't get dma_mask
	 * set. Since shared usb code relies on it, set it here for
	 * now. Once we have dma capability bindings this can go away.
	 */
	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
		goto err;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(regs)) {
		err = PTR_ERR(regs);
		goto err;
	}

	hcd = usb_create_hcd(&ehci_orion_hc_driver,
			&pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
		err = -ENOMEM;
		goto err;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = regs;

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs + 0x100;
	hcd->has_tt = 1;

	priv = hcd_to_orion_priv(hcd);
	/*
	 * Not all platforms can gate the clock, so it is not an error if
	 * the clock does not exists.
	 */
	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (!IS_ERR(priv->clk))
		clk_prepare_enable(priv->clk);

	priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
	if (IS_ERR(priv->phy)) {
		err = PTR_ERR(priv->phy);
		goto err_phy_get;
	} else {
		err = phy_init(priv->phy);
		if (err)
			goto err_phy_init;

		err = phy_power_on(priv->phy);
		if (err)
			goto err_phy_power_on;
	}

	/*
	 * (Re-)program MBUS remapping windows if we are asked to.
	 */
	dram = mv_mbus_dram_info();
	if (dram)
		ehci_orion_conf_mbus_windows(hcd, dram);

	/*
	 * setup Orion USB controller.
	 */
	if (pdev->dev.of_node)
		phy_version = EHCI_PHY_NA;
	else
		phy_version = pd->phy_version;

	switch (phy_version) {
	case EHCI_PHY_NA:	/* dont change USB phy settings */
		break;
	case EHCI_PHY_ORION:
		orion_usb_phy_v1_setup(hcd);
		break;
	case EHCI_PHY_DD:
	case EHCI_PHY_KW:
	default:
		dev_warn(&pdev->dev, "USB phy version isn't supported.\n");
	}

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err)
		goto err_add_hcd;

	device_wakeup_enable(hcd->self.controller);
	return 0;

err_add_hcd:
	if (!IS_ERR(priv->phy))
		phy_power_off(priv->phy);
err_phy_power_on:
	if (!IS_ERR(priv->phy))
		phy_exit(priv->phy);
err_phy_init:
err_phy_get:
	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);
	usb_put_hcd(hcd);
err:
	dev_err(&pdev->dev, "init %s fail, %d\n",
		dev_name(&pdev->dev), err);

	return err;
}

static int ehci_orion_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct orion_ehci_hcd *priv = hcd_to_orion_priv(hcd);

	usb_remove_hcd(hcd);

	if (!IS_ERR(priv->phy)) {
		phy_power_off(priv->phy);
		phy_exit(priv->phy);
	}

	if (!IS_ERR(priv->clk))
		clk_disable_unprepare(priv->clk);

	usb_put_hcd(hcd);

	return 0;
}

static const struct of_device_id ehci_orion_dt_ids[] = {
	{ .compatible = "marvell,orion-ehci", },
	{},
};
MODULE_DEVICE_TABLE(of, ehci_orion_dt_ids);

static struct platform_driver ehci_orion_driver = {
	.probe		= ehci_orion_drv_probe,
	.remove		= ehci_orion_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver = {
		.name	= "orion-ehci",
		.of_match_table = ehci_orion_dt_ids,
	},
};

static int __init ehci_orion_init(void)
{
	if (usb_disabled())
		return -ENODEV;

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);

	ehci_init_driver(&ehci_orion_hc_driver, &orion_overrides);
	return platform_driver_register(&ehci_orion_driver);
}
module_init(ehci_orion_init);

static void __exit ehci_orion_cleanup(void)
{
	platform_driver_unregister(&ehci_orion_driver);
}
module_exit(ehci_orion_cleanup);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:orion-ehci");
MODULE_AUTHOR("Tzachi Perelstein");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud