~funderscore blog cgit wiki get in touch
aboutsummaryrefslogtreecommitdiff
blob: a0bcc8d3e55bfcf360a822f52c5bd67961f22da6 (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * QE UEC ethernet phy controller driver
 *
 * based on phy parts of drivers/qe/uec.c and drivers/qe/uec_phy.c
 * from NXP
 *
 * Copyright (C) 2020 Heiko Schocher <hs@denx.de>
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <miiphy.h>
#include <phy.h>
#include <asm/io.h>
#include <linux/ioport.h>

#include "dm_qe_uec.h"

struct qe_uec_mdio_priv {
	struct ucc_mii_mng *base;
};

static int
qe_uec_mdio_read(struct udevice *dev, int addr, int devad, int reg)
{
	struct qe_uec_mdio_priv *priv = dev_get_priv(dev);
	struct ucc_mii_mng *regs = priv->base;
	u32 tmp_reg;
	u16 value;

	debug("%s: regs: %p addr: %x devad: %x reg: %x\n", __func__, regs,
	      addr, devad, reg);
	/* Setting up the MII management Address Register */
	tmp_reg = ((u32)addr << MIIMADD_PHY_ADDRESS_SHIFT) | reg;
	out_be32(&regs->miimadd, tmp_reg);

	/* clear MII management command cycle */
	out_be32(&regs->miimcom, 0);
	sync();

	/* Perform an MII management read cycle */
	out_be32(&regs->miimcom, MIIMCOM_READ_CYCLE);

	/* Wait till MII management write is complete */
	while ((in_be32(&regs->miimind)) &
	       (MIIMIND_NOT_VALID | MIIMIND_BUSY))
		;

	/* Read MII management status  */
	value = (u16)in_be32(&regs->miimstat);
	if (value == 0xffff)
		return -EINVAL;

	return value;
};

static int
qe_uec_mdio_write(struct udevice *dev, int addr, int devad, int reg,
		  u16 value)
{
	struct qe_uec_mdio_priv *priv = dev_get_priv(dev);
	struct ucc_mii_mng *regs = priv->base;
	u32 tmp_reg;

	debug("%s: regs: %p addr: %x devad: %x reg: %x val: %x\n", __func__,
	      regs, addr, devad, reg, value);

	/* Stop the MII management read cycle */
	out_be32(&regs->miimcom, 0);
	/* Setting up the MII management Address Register */
	tmp_reg = ((u32)addr << MIIMADD_PHY_ADDRESS_SHIFT) | reg;
	out_be32(&regs->miimadd, tmp_reg);

	/* Setting up the MII management Control Register with the value */
	out_be32(&regs->miimcon, (u32)value);
	sync();

	/* Wait till MII management write is complete */
	while ((in_be32(&regs->miimind)) & MIIMIND_BUSY)
		;

	return 0;
};

static const struct mdio_ops qe_uec_mdio_ops = {
	.read = qe_uec_mdio_read,
	.write = qe_uec_mdio_write,
};

static int qe_uec_mdio_probe(struct udevice *dev)
{
	struct qe_uec_mdio_priv *priv = dev_get_priv(dev);
	fdt_size_t base;
	ofnode node;
	u32 num = 0;
	int ret = -ENODEV;

	priv->base = dev_read_addr_ptr(dev);
	base = (fdt_size_t)priv->base;

	/*
	 * idea from linux:
	 * drivers/net/ethernet/freescale/fsl_pq_mdio.c
	 *
	 * Find the UCC node that controls the given MDIO node
	 *
	 * For some reason, the QE MDIO nodes are not children of the UCC
	 * devices that control them.  Therefore, we need to scan all UCC
	 * nodes looking for the one that encompases the given MDIO node.
	 * We do this by comparing physical addresses.  The 'start' and
	 * 'end' addresses of the MDIO node are passed, and the correct
	 * UCC node will cover the entire address range.
	 */
	node = ofnode_by_compatible(ofnode_null(), "ucc_geth");
	while (ofnode_valid(node)) {
		fdt_size_t size;
		fdt_addr_t addr;

		addr = ofnode_get_addr_index(node, 0);
		ret = ofnode_get_addr_size_index(node, 0, &size);

		if (addr == FDT_ADDR_T_NONE) {
			node = ofnode_by_compatible(node, "ucc_geth");
			continue;
		}

		/* check if priv->base in start end */
		if (base > addr && base < (addr + size)) {
			ret = ofnode_read_u32(node, "cell-index", &num);
			if (ret)
				ret = ofnode_read_u32(node, "device-id",
						      &num);
			break;
		}
		node = ofnode_by_compatible(node, "ucc_geth");
	}

	if (ret) {
		printf("%s: no cell-index nor device-id found!", __func__);
		return ret;
	}

	/* Setup MII master clock source */
	qe_set_mii_clk_src(num - 1);

	return 0;
}

static const struct udevice_id qe_uec_mdio_ids[] = {
	{ .compatible = "fsl,ucc-mdio" },
	{ }
};

U_BOOT_DRIVER(mvmdio) = {
	.name			= "qe_uec_mdio",
	.id			= UCLASS_MDIO,
	.of_match		= qe_uec_mdio_ids,
	.probe			= qe_uec_mdio_probe,
	.ops			= &qe_uec_mdio_ops,
	.priv_auto	= sizeof(struct qe_uec_mdio_priv),
};