summaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-rcar.c
blob: c4d8811343a1e1336f812d8d47cedb24b3bb6f16 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
 *
 * Renesas RCar USB HOST xHCI Controller
 */

#include <common.h>
#include <clk.h>
#include <dm.h>
#include <fdtdec.h>
#include <usb.h>
#include <wait_bit.h>

#include <usb/xhci.h>
#include "xhci-rcar-r8a779x_usb3_v3.h"

/* Register Offset */
#define RCAR_USB3_DL_CTRL	0x250	/* FW Download Control & Status */
#define RCAR_USB3_FW_DATA0	0x258	/* FW Data0 */

/* Register Settings */
/* FW Download Control & Status */
#define RCAR_USB3_DL_CTRL_ENABLE	BIT(0)
#define RCAR_USB3_DL_CTRL_FW_SUCCESS	BIT(4)
#define RCAR_USB3_DL_CTRL_FW_SET_DATA0	BIT(8)

struct rcar_xhci_platdata {
	fdt_addr_t	hcd_base;
	struct clk	clk;
};

/**
 * Contains pointers to register base addresses
 * for the usb controller.
 */
struct rcar_xhci {
	struct xhci_ctrl ctrl;	/* Needs to come first in this struct! */
	struct usb_platdata usb_plat;
	struct xhci_hccr *hcd;
};

static int xhci_rcar_download_fw(struct rcar_xhci *ctx, const u32 *fw_data,
				 const size_t fw_array_size)
{
	void __iomem *regs = (void __iomem *)ctx->hcd;
	int i, ret;

	/* Download R-Car USB3.0 firmware */
	setbits_le32(regs + RCAR_USB3_DL_CTRL, RCAR_USB3_DL_CTRL_ENABLE);

	for (i = 0; i < fw_array_size; i++) {
		writel(fw_data[i], regs + RCAR_USB3_FW_DATA0);
		setbits_le32(regs + RCAR_USB3_DL_CTRL,
			     RCAR_USB3_DL_CTRL_FW_SET_DATA0);

		ret = wait_for_bit_le32(regs + RCAR_USB3_DL_CTRL,
					RCAR_USB3_DL_CTRL_FW_SET_DATA0, false,
					10, false);
		if (ret)
			break;
	}

	clrbits_le32(regs + RCAR_USB3_DL_CTRL, RCAR_USB3_DL_CTRL_ENABLE);

	ret = wait_for_bit_le32(regs + RCAR_USB3_DL_CTRL,
				RCAR_USB3_DL_CTRL_FW_SUCCESS, true,
				10, false);

	return ret;
}

static int xhci_rcar_probe(struct udevice *dev)
{
	struct rcar_xhci_platdata *plat = dev_get_platdata(dev);
	struct rcar_xhci *ctx = dev_get_priv(dev);
	struct xhci_hcor *hcor;
	int len, ret;

	ret = clk_get_by_index(dev, 0, &plat->clk);
	if (ret < 0) {
		dev_err(dev, "Failed to get USB3 clock\n");
		return ret;
	}

	ret = clk_enable(&plat->clk);
	if (ret) {
		dev_err(dev, "Failed to enable USB3 clock\n");
		goto err_clk;
	}

	ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
	len = HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase));
	hcor = (struct xhci_hcor *)((uintptr_t)ctx->hcd + len);

	ret = xhci_rcar_download_fw(ctx, firmware_r8a779x_usb3_v3,
				    ARRAY_SIZE(firmware_r8a779x_usb3_v3));
	if (ret) {
		dev_err(dev, "Failed to download firmware\n");
		goto err_fw;
	}

	ret = xhci_register(dev, ctx->hcd, hcor);
	if (ret) {
		dev_err(dev, "Failed to register xHCI\n");
		goto err_fw;
	}

	return 0;

err_fw:
	clk_disable(&plat->clk);
err_clk:
	clk_free(&plat->clk);
	return ret;
}

static int xhci_rcar_deregister(struct udevice *dev)
{
	int ret;
	struct rcar_xhci_platdata *plat = dev_get_platdata(dev);

	ret = xhci_deregister(dev);

	clk_disable(&plat->clk);
	clk_free(&plat->clk);

	return ret;
}

static int xhci_rcar_ofdata_to_platdata(struct udevice *dev)
{
	struct rcar_xhci_platdata *plat = dev_get_platdata(dev);

	plat->hcd_base = devfdt_get_addr(dev);
	if (plat->hcd_base == FDT_ADDR_T_NONE) {
		debug("Can't get the XHCI register base address\n");
		return -ENXIO;
	}

	return 0;
}

static const struct udevice_id xhci_rcar_ids[] = {
	{ .compatible = "renesas,xhci-r8a7795" },
	{ .compatible = "renesas,xhci-r8a7796" },
	{ .compatible = "renesas,xhci-r8a77965" },
	{ }
};

U_BOOT_DRIVER(usb_xhci) = {
	.name		= "xhci_rcar",
	.id		= UCLASS_USB,
	.probe		= xhci_rcar_probe,
	.remove		= xhci_rcar_deregister,
	.ops		= &xhci_usb_ops,
	.of_match	= xhci_rcar_ids,
	.ofdata_to_platdata = xhci_rcar_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct rcar_xhci_platdata),
	.priv_auto_alloc_size = sizeof(struct rcar_xhci),
	.flags		= DM_FLAG_ALLOC_PRIV_DMA,
};