summaryrefslogtreecommitdiff
path: root/drivers/net/fsl_enetc_mdio.c
blob: 47257a6cf686ebc7b2e946f29b3ee4600b9837ae (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * ENETC ethernet controller driver
 * Copyright 2019 NXP
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <pci.h>
#include <miiphy.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <miiphy.h>

#include "fsl_enetc.h"

static void enetc_mdio_wait_bsy(struct enetc_mdio_priv *priv)
{
	int to = 10000;

	while ((enetc_read(priv, ENETC_MDIO_CFG) & ENETC_EMDIO_CFG_BSY) &&
	       --to)
		cpu_relax();
	if (!to)
		printf("T");
}

int enetc_mdio_read_priv(struct enetc_mdio_priv *priv, int addr, int devad,
			 int reg)
{
	if (devad == MDIO_DEVAD_NONE)
		enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C22);
	else
		enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C45);
	enetc_mdio_wait_bsy(priv);

	if (devad == MDIO_DEVAD_NONE) {
		enetc_write(priv, ENETC_MDIO_CTL, ENETC_MDIO_CTL_READ |
			    (addr << 5) | reg);
	} else {
		enetc_write(priv, ENETC_MDIO_CTL, (addr << 5) + devad);
		enetc_mdio_wait_bsy(priv);

		enetc_write(priv, ENETC_MDIO_STAT, reg);
		enetc_mdio_wait_bsy(priv);

		enetc_write(priv, ENETC_MDIO_CTL, ENETC_MDIO_CTL_READ |
			    (addr << 5) | devad);
	}

	enetc_mdio_wait_bsy(priv);
	if (enetc_read(priv, ENETC_MDIO_CFG) & ENETC_EMDIO_CFG_RD_ER)
		return ENETC_MDIO_READ_ERR;

	return enetc_read(priv, ENETC_MDIO_DATA);
}

int enetc_mdio_write_priv(struct enetc_mdio_priv *priv, int addr, int devad,
			  int reg, u16 val)
{
	if (devad == MDIO_DEVAD_NONE)
		enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C22);
	else
		enetc_write(priv, ENETC_MDIO_CFG, ENETC_EMDIO_CFG_C45);
	enetc_mdio_wait_bsy(priv);

	if (devad != MDIO_DEVAD_NONE) {
		enetc_write(priv, ENETC_MDIO_CTL, (addr << 5) + devad);
		enetc_write(priv, ENETC_MDIO_STAT, reg);
	} else {
		enetc_write(priv, ENETC_MDIO_CTL, (addr << 5) + reg);
	}
	enetc_mdio_wait_bsy(priv);

	enetc_write(priv, ENETC_MDIO_DATA, val);
	enetc_mdio_wait_bsy(priv);

	return 0;
}

/* DM wrappers */
static int dm_enetc_mdio_read(struct udevice *dev, int addr, int devad, int reg)
{
	struct enetc_mdio_priv *priv = dev_get_priv(dev);

	return enetc_mdio_read_priv(priv, addr, devad, reg);
}

static int dm_enetc_mdio_write(struct udevice *dev, int addr, int devad,
			       int reg, u16 val)
{
	struct enetc_mdio_priv *priv = dev_get_priv(dev);

	return enetc_mdio_write_priv(priv, addr, devad, reg, val);
}

static const struct mdio_ops enetc_mdio_ops = {
	.read = dm_enetc_mdio_read,
	.write = dm_enetc_mdio_write,
};

static int enetc_mdio_bind(struct udevice *dev)
{
	char name[16];
	static int eth_num_devices;

	/*
	 * prefer using PCI function numbers to number interfaces, but these
	 * are only available if dts nodes are present.  For PCI they are
	 * optional, handle that case too.  Just in case some nodes are present
	 * and some are not, use different naming scheme - enetc-N based on
	 * PCI function # and enetc#N based on interface count
	 */
	if (ofnode_valid(dev->node))
		sprintf(name, "emdio-%u", PCI_FUNC(pci_get_devfn(dev)));
	else
		sprintf(name, "emdio#%u", eth_num_devices++);
	device_set_name(dev, name);

	return 0;
}

static int enetc_mdio_probe(struct udevice *dev)
{
	struct enetc_mdio_priv *priv = dev_get_priv(dev);

	priv->regs_base = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_0, 0);
	if (!priv->regs_base) {
		enetc_dbg(dev, "failed to map BAR0\n");
		return -EINVAL;
	}

	priv->regs_base += ENETC_MDIO_BASE;

	dm_pci_clrset_config16(dev, PCI_COMMAND, 0, PCI_COMMAND_MEMORY);

	return 0;
}

U_BOOT_DRIVER(enetc_mdio) = {
	.name	= "enetc_mdio",
	.id	= UCLASS_MDIO,
	.bind	= enetc_mdio_bind,
	.probe	= enetc_mdio_probe,
	.ops	= &enetc_mdio_ops,
	.priv_auto_alloc_size = sizeof(struct enetc_mdio_priv),
};

static struct pci_device_id enetc_mdio_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, PCI_DEVICE_ID_ENETC_MDIO) },
	{ }
};

U_BOOT_PCI_DEVICE(enetc_mdio, enetc_mdio_ids);