summaryrefslogtreecommitdiffstats
path: root/drivers/soc/lantiq/gphy.c
blob: 8d8659463b3e85f4e1513007dde398ced1bc3e6a (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
/*
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 *  Copyright (C) 2012 John Crispin <blogic@phrozen.org>
 *  Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
 *  Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/property.h>
#include <dt-bindings/mips/lantiq_rcu_gphy.h>

#include <lantiq_soc.h>

#define XRX200_GPHY_FW_ALIGN	(16 * 1024)

struct xway_gphy_priv {
	struct clk *gphy_clk_gate;
	struct reset_control *gphy_reset;
	struct reset_control *gphy_reset2;
	struct notifier_block gphy_reboot_nb;
	void __iomem *membase;
	char *fw_name;
};

struct xway_gphy_match_data {
	char *fe_firmware_name;
	char *ge_firmware_name;
};

static const struct xway_gphy_match_data xrx200a1x_gphy_data = {
	.fe_firmware_name = "lantiq/xrx200_phy22f_a14.bin",
	.ge_firmware_name = "lantiq/xrx200_phy11g_a14.bin",
};

static const struct xway_gphy_match_data xrx200a2x_gphy_data = {
	.fe_firmware_name = "lantiq/xrx200_phy22f_a22.bin",
	.ge_firmware_name = "lantiq/xrx200_phy11g_a22.bin",
};

static const struct xway_gphy_match_data xrx300_gphy_data = {
	.fe_firmware_name = "lantiq/xrx300_phy22f_a21.bin",
	.ge_firmware_name = "lantiq/xrx300_phy11g_a21.bin",
};

static const struct of_device_id xway_gphy_match[] = {
	{ .compatible = "lantiq,xrx200a1x-gphy", .data = &xrx200a1x_gphy_data },
	{ .compatible = "lantiq,xrx200a2x-gphy", .data = &xrx200a2x_gphy_data },
	{ .compatible = "lantiq,xrx300-gphy", .data = &xrx300_gphy_data },
	{ .compatible = "lantiq,xrx330-gphy", .data = &xrx300_gphy_data },
	{},
};
MODULE_DEVICE_TABLE(of, xway_gphy_match);

static struct xway_gphy_priv *to_xway_gphy_priv(struct notifier_block *nb)
{
	return container_of(nb, struct xway_gphy_priv, gphy_reboot_nb);
}

static int xway_gphy_reboot_notify(struct notifier_block *reboot_nb,
				   unsigned long code, void *unused)
{
	struct xway_gphy_priv *priv = to_xway_gphy_priv(reboot_nb);

	if (priv) {
		reset_control_assert(priv->gphy_reset);
		reset_control_assert(priv->gphy_reset2);
	}

	return NOTIFY_DONE;
}

static int xway_gphy_load(struct device *dev, struct xway_gphy_priv *priv,
			  dma_addr_t *dev_addr)
{
	const struct firmware *fw;
	void *fw_addr;
	dma_addr_t dma_addr;
	size_t size;
	int ret;

	ret = request_firmware(&fw, priv->fw_name, dev);
	if (ret) {
		dev_err(dev, "failed to load firmware: %s, error: %i\n",
			priv->fw_name, ret);
		return ret;
	}

	/*
	 * GPHY cores need the firmware code in a persistent and contiguous
	 * memory area with a 16 kB boundary aligned start address.
	 */
	size = fw->size + XRX200_GPHY_FW_ALIGN;

	fw_addr = dmam_alloc_coherent(dev, size, &dma_addr, GFP_KERNEL);
	if (fw_addr) {
		fw_addr = PTR_ALIGN(fw_addr, XRX200_GPHY_FW_ALIGN);
		*dev_addr = ALIGN(dma_addr, XRX200_GPHY_FW_ALIGN);
		memcpy(fw_addr, fw->data, fw->size);
	} else {
		dev_err(dev, "failed to alloc firmware memory\n");
		ret = -ENOMEM;
	}

	release_firmware(fw);

	return ret;
}

static int xway_gphy_of_probe(struct platform_device *pdev,
			      struct xway_gphy_priv *priv)
{
	struct device *dev = &pdev->dev;
	const struct xway_gphy_match_data *gphy_fw_name_cfg;
	u32 gphy_mode;
	int ret;
	struct resource *res_gphy;

	gphy_fw_name_cfg = of_device_get_match_data(dev);

	priv->gphy_clk_gate = devm_clk_get(dev, NULL);
	if (IS_ERR(priv->gphy_clk_gate)) {
		dev_err(dev, "Failed to lookup gate clock\n");
		return PTR_ERR(priv->gphy_clk_gate);
	}

	res_gphy = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->membase = devm_ioremap_resource(dev, res_gphy);
	if (IS_ERR(priv->membase))
		return PTR_ERR(priv->membase);

	priv->gphy_reset = devm_reset_control_get(dev, "gphy");
	if (IS_ERR(priv->gphy_reset)) {
		if (PTR_ERR(priv->gphy_reset) != -EPROBE_DEFER)
			dev_err(dev, "Failed to lookup gphy reset\n");
		return PTR_ERR(priv->gphy_reset);
	}

	priv->gphy_reset2 = devm_reset_control_get_optional(dev, "gphy2");
	if (IS_ERR(priv->gphy_reset2))
		return PTR_ERR(priv->gphy_reset2);

	ret = device_property_read_u32(dev, "lantiq,gphy-mode", &gphy_mode);
	/* Default to GE mode */
	if (ret)
		gphy_mode = GPHY_MODE_GE;

	switch (gphy_mode) {
	case GPHY_MODE_FE:
		priv->fw_name = gphy_fw_name_cfg->fe_firmware_name;
		break;
	case GPHY_MODE_GE:
		priv->fw_name = gphy_fw_name_cfg->ge_firmware_name;
		break;
	default:
		dev_err(dev, "Unknown GPHY mode %d\n", gphy_mode);
		return -EINVAL;
	}

	return 0;
}

static int xway_gphy_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct xway_gphy_priv *priv;
	dma_addr_t fw_addr = 0;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	ret = xway_gphy_of_probe(pdev, priv);
	if (ret)
		return ret;

	ret = clk_prepare_enable(priv->gphy_clk_gate);
	if (ret)
		return ret;

	ret = xway_gphy_load(dev, priv, &fw_addr);
	if (ret) {
		clk_disable_unprepare(priv->gphy_clk_gate);
		return ret;
	}

	reset_control_assert(priv->gphy_reset);
	reset_control_assert(priv->gphy_reset2);

	iowrite32be(fw_addr, priv->membase);

	reset_control_deassert(priv->gphy_reset);
	reset_control_deassert(priv->gphy_reset2);

	/* assert the gphy reset because it can hang after a reboot: */
	priv->gphy_reboot_nb.notifier_call = xway_gphy_reboot_notify;
	priv->gphy_reboot_nb.priority = -1;

	ret = register_reboot_notifier(&priv->gphy_reboot_nb);
	if (ret)
		dev_warn(dev, "Failed to register reboot notifier\n");

	platform_set_drvdata(pdev, priv);

	return ret;
}

static int xway_gphy_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct xway_gphy_priv *priv = platform_get_drvdata(pdev);
	int ret;

	reset_control_assert(priv->gphy_reset);
	reset_control_assert(priv->gphy_reset2);

	iowrite32be(0, priv->membase);

	clk_disable_unprepare(priv->gphy_clk_gate);

	ret = unregister_reboot_notifier(&priv->gphy_reboot_nb);
	if (ret)
		dev_warn(dev, "Failed to unregister reboot notifier\n");

	return 0;
}

static struct platform_driver xway_gphy_driver = {
	.probe = xway_gphy_probe,
	.remove = xway_gphy_remove,
	.driver = {
		.name = "xway-rcu-gphy",
		.of_match_table = xway_gphy_match,
	},
};

module_platform_driver(xway_gphy_driver);

MODULE_FIRMWARE("lantiq/xrx300_phy11g_a21.bin");
MODULE_FIRMWARE("lantiq/xrx300_phy22f_a21.bin");
MODULE_FIRMWARE("lantiq/xrx200_phy11g_a14.bin");
MODULE_FIRMWARE("lantiq/xrx200_phy11g_a22.bin");
MODULE_FIRMWARE("lantiq/xrx200_phy22f_a14.bin");
MODULE_FIRMWARE("lantiq/xrx200_phy22f_a22.bin");
MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>");
MODULE_DESCRIPTION("Lantiq XWAY GPHY Firmware Loader");
MODULE_LICENSE("GPL");