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/kernel.h>
20 #include <linux/ethtool.h>
23 #include "ibm_emac_core.h"
24 #include "ibm_emac_debug.h"
27 #define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
28 #define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
29 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
31 #define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
32 #define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
33 #define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
36 #define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
37 #define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
38 #define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
40 /* ZMII only supports MII, RMII and SMII
41 * we also support autodetection for backward compatibility
43 static inline int zmii_valid_mode(int mode)
45 return mode == PHY_MODE_MII ||
46 mode == PHY_MODE_RMII ||
47 mode == PHY_MODE_SMII ||
51 static inline const char *zmii_mode_name(int mode)
65 static inline u32 zmii_mode_mask(int mode, int input)
69 return ZMII_FER_MII(input);
71 return ZMII_FER_RMII(input);
73 return ZMII_FER_SMII(input);
79 static int __init zmii_init(struct ocp_device *ocpdev, int input, int *mode)
81 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
82 struct zmii_regs __iomem *p;
84 ZMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, *mode);
87 dev = kzalloc(sizeof(struct ibm_ocp_zmii), GFP_KERNEL);
90 "zmii%d: couldn't allocate device structure!\n",
94 dev->mode = PHY_MODE_NA;
96 p = ioremap(ocpdev->def->paddr, sizeof(struct zmii_regs));
99 "zmii%d: could not ioremap device registers!\n",
105 ocp_set_drvdata(ocpdev, dev);
107 /* We may need FER value for autodetection later */
108 dev->fer_save = in_be32(&p->fer);
110 /* Disable all inputs by default */
111 out_be32(&p->fer, 0);
115 if (!zmii_valid_mode(*mode)) {
116 /* Probably an EMAC connected to RGMII,
117 * but it still may need ZMII for MDIO
122 /* Autodetect ZMII mode if not specified.
123 * This is only for backward compatibility with the old driver.
124 * Please, always specify PHY mode in your board port to avoid
127 if (dev->mode == PHY_MODE_NA) {
128 if (*mode == PHY_MODE_NA) {
129 u32 r = dev->fer_save;
131 ZMII_DBG("%d: autodetecting mode, FER = 0x%08x" NL,
132 ocpdev->def->index, r);
134 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
135 dev->mode = PHY_MODE_MII;
136 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
137 dev->mode = PHY_MODE_RMII;
139 dev->mode = PHY_MODE_SMII;
143 printk(KERN_NOTICE "zmii%d: bridge in %s mode\n",
144 ocpdev->def->index, zmii_mode_name(dev->mode));
146 /* All inputs must use the same mode */
147 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
149 "zmii%d: invalid mode %d specified for input %d\n",
150 ocpdev->def->index, *mode, input);
155 /* Report back correct PHY mode,
156 * it may be used during PHY initialization.
160 /* Enable this input */
161 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
167 int __init zmii_attach(void *emac)
169 struct ocp_enet_private *dev = emac;
170 struct ocp_func_emac_data *emacdata = dev->def->additions;
172 if (emacdata->zmii_idx >= 0) {
173 dev->zmii_input = emacdata->zmii_mux;
175 ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_ZMII,
177 if (!dev->zmii_dev) {
178 printk(KERN_ERR "emac%d: unknown zmii%d!\n",
179 dev->def->index, emacdata->zmii_idx);
183 (dev->zmii_dev, dev->zmii_input, &emacdata->phy_mode)) {
185 "emac%d: zmii%d initialization failed!\n",
186 dev->def->index, emacdata->zmii_idx);
193 void __zmii_enable_mdio(struct ocp_device *ocpdev, int input)
195 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
196 u32 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
198 ZMII_DBG2("%d: mdio(%d)" NL, ocpdev->def->index, input);
200 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
203 void __zmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
205 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
206 u32 ssr = in_be32(&dev->base->ssr);
208 ZMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
210 if (speed == SPEED_100)
211 ssr |= ZMII_SSR_SP(input);
213 ssr &= ~ZMII_SSR_SP(input);
215 out_be32(&dev->base->ssr, ssr);
218 void __exit __zmii_fini(struct ocp_device *ocpdev, int input)
220 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
221 BUG_ON(!dev || dev->users == 0);
223 ZMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
225 /* Disable this input */
226 out_be32(&dev->base->fer,
227 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
230 /* Free everything if this is the last user */
231 ocp_set_drvdata(ocpdev, NULL);
237 int __zmii_get_regs_len(struct ocp_device *ocpdev)
239 return sizeof(struct emac_ethtool_regs_subhdr) +
240 sizeof(struct zmii_regs);
243 void *zmii_dump_regs(struct ocp_device *ocpdev, void *buf)
245 struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
246 struct emac_ethtool_regs_subhdr *hdr = buf;
247 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
250 hdr->index = ocpdev->def->index;
251 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));