2 * drivers/net/ibm_emac/ibm_emac_zmii.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
6 * Copyright (c) 2004, 2005 Zultys Technologies.
7 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
9 * Based on original work by
10 * Armin Kuster <akuster@mvista.com>
11 * Copyright 2001 MontaVista Softare Inc.
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
19 #include <linux/config.h>
20 #include <linux/kernel.h>
21 #include <linux/ethtool.h>
24 #include "ibm_emac_core.h"
25 #include "ibm_emac_debug.h"
28 #define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
29 #define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
30 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
32 #define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
33 #define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
34 #define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
37 #define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
38 #define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
39 #define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
41 /* ZMII only supports MII, RMII and SMII
42 * we also support autodetection for backward compatibility
44 static inline int zmii_valid_mode(int mode)
46 return mode == PHY_MODE_MII ||
47 mode == PHY_MODE_RMII ||
48 mode == PHY_MODE_SMII ||
52 static inline const char *zmii_mode_name(int mode)
66 static inline u32 zmii_mode_mask(int mode, int input)
70 return ZMII_FER_MII(input);
72 return ZMII_FER_RMII(input);
74 return ZMII_FER_SMII(input);
80 static int __init zmii_init(struct ocp_device *ocpdev, int input, int *mode)
82 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
85 ZMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, *mode);
88 dev = kzalloc(sizeof(struct ibm_ocp_zmii), GFP_KERNEL);
91 "zmii%d: couldn't allocate device structure!\n",
95 dev->mode = PHY_MODE_NA;
97 p = (struct zmii_regs *)ioremap(ocpdev->def->paddr,
98 sizeof(struct zmii_regs));
101 "zmii%d: could not ioremap device registers!\n",
107 ocp_set_drvdata(ocpdev, dev);
109 /* We may need FER value for autodetection later */
110 dev->fer_save = in_be32(&p->fer);
112 /* Disable all inputs by default */
113 out_be32(&p->fer, 0);
117 if (!zmii_valid_mode(*mode)) {
118 /* Probably an EMAC connected to RGMII,
119 * but it still may need ZMII for MDIO
124 /* Autodetect ZMII mode if not specified.
125 * This is only for backward compatibility with the old driver.
126 * Please, always specify PHY mode in your board port to avoid
129 if (dev->mode == PHY_MODE_NA) {
130 if (*mode == PHY_MODE_NA) {
131 u32 r = dev->fer_save;
133 ZMII_DBG("%d: autodetecting mode, FER = 0x%08x" NL,
134 ocpdev->def->index, r);
136 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
137 dev->mode = PHY_MODE_MII;
138 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
139 dev->mode = PHY_MODE_RMII;
141 dev->mode = PHY_MODE_SMII;
145 printk(KERN_NOTICE "zmii%d: bridge in %s mode\n",
146 ocpdev->def->index, zmii_mode_name(dev->mode));
148 /* All inputs must use the same mode */
149 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
151 "zmii%d: invalid mode %d specified for input %d\n",
152 ocpdev->def->index, *mode, input);
157 /* Report back correct PHY mode,
158 * it may be used during PHY initialization.
162 /* Enable this input */
163 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
169 int __init zmii_attach(void *emac)
171 struct ocp_enet_private *dev = emac;
172 struct ocp_func_emac_data *emacdata = dev->def->additions;
174 if (emacdata->zmii_idx >= 0) {
175 dev->zmii_input = emacdata->zmii_mux;
177 ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_ZMII,
179 if (!dev->zmii_dev) {
180 printk(KERN_ERR "emac%d: unknown zmii%d!\n",
181 dev->def->index, emacdata->zmii_idx);
185 (dev->zmii_dev, dev->zmii_input, &emacdata->phy_mode)) {
187 "emac%d: zmii%d initialization failed!\n",
188 dev->def->index, emacdata->zmii_idx);
195 void __zmii_enable_mdio(struct ocp_device *ocpdev, int input)
197 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
198 u32 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
200 ZMII_DBG2("%d: mdio(%d)" NL, ocpdev->def->index, input);
202 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
205 void __zmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
207 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
208 u32 ssr = in_be32(&dev->base->ssr);
210 ZMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
212 if (speed == SPEED_100)
213 ssr |= ZMII_SSR_SP(input);
215 ssr &= ~ZMII_SSR_SP(input);
217 out_be32(&dev->base->ssr, ssr);
220 void __exit __zmii_fini(struct ocp_device *ocpdev, int input)
222 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
223 BUG_ON(!dev || dev->users == 0);
225 ZMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
227 /* Disable this input */
228 out_be32(&dev->base->fer,
229 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
232 /* Free everything if this is the last user */
233 ocp_set_drvdata(ocpdev, NULL);
234 iounmap((void *)dev->base);
239 int __zmii_get_regs_len(struct ocp_device *ocpdev)
241 return sizeof(struct emac_ethtool_regs_subhdr) +
242 sizeof(struct zmii_regs);
245 void *zmii_dump_regs(struct ocp_device *ocpdev, void *buf)
247 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
248 struct emac_ethtool_regs_subhdr *hdr = buf;
249 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
252 hdr->index = ocpdev->def->index;
253 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));