tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/* Driver for Asix PHYs
3 *
4 * Author: Michael Schmitz <schmitzmic@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/mii.h>
17#include <linux/phy.h>
18
19#define PHY_ID_ASIX_AX88796B 0x003b1841
20
21MODULE_DESCRIPTION("Asix PHY driver");
22MODULE_AUTHOR("Michael Schmitz <schmitzmic@gmail.com>");
23MODULE_LICENSE("GPL");
24
25/**
26 * asix_soft_reset - software reset the PHY via BMCR_RESET bit
27 * @phydev: target phy_device struct
28 *
29 * Description: Perform a software PHY reset using the standard
30 * BMCR_RESET bit and poll for the reset bit to be cleared.
31 * Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation
32 * such as used on the Individual Computers' X-Surf 100 Zorro card.
33 *
34 * Returns: 0 on success, < 0 on failure
35 */
36static int asix_soft_reset(struct phy_device *phydev)
37{
38 int ret;
39
40 /* Asix PHY won't reset unless reset bit toggles */
41 ret = phy_write(phydev, MII_BMCR, 0);
42 if (ret < 0)
43 return ret;
44
45 return genphy_soft_reset(phydev);
46}
47
48static struct phy_driver asix_driver[] = { {
49 .phy_id = PHY_ID_ASIX_AX88796B,
50 .name = "Asix Electronics AX88796B",
51 .phy_id_mask = 0xfffffff0,
52 .features = PHY_BASIC_FEATURES,
53 .soft_reset = asix_soft_reset,
54} };
55
56module_phy_driver(asix_driver);
57
58static struct mdio_device_id __maybe_unused asix_tbl[] = {
59 { PHY_ID_ASIX_AX88796B, 0xfffffff0 },
60 { }
61};
62
63MODULE_DEVICE_TABLE(mdio, asix_tbl);