2 * drivers/net/ethernet/ibm/emac/zmii.c
4 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
6 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
7 * <benh@kernel.crashing.org>
9 * Based on the arch/ppc version of the driver:
11 * Copyright (c) 2004, 2005 Zultys Technologies.
12 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
14 * Based on original work by
15 * Armin Kuster <akuster@mvista.com>
16 * Copyright 2001 MontaVista Softare Inc.
18 * This program is free software; you can redistribute it and/or modify it
19 * under the terms of the GNU General Public License as published by the
20 * Free Software Foundation; either version 2 of the License, or (at your
21 * option) any later version.
24 #include <linux/slab.h>
25 #include <linux/kernel.h>
26 #include <linux/ethtool.h>
27 #include <linux/of_address.h>
34 #define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
35 #define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
36 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
38 #define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
39 #define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
40 #define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
43 #define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
44 #define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
45 #define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
47 /* ZMII only supports MII, RMII and SMII
48 * we also support autodetection for backward compatibility
50 static inline int zmii_valid_mode(int mode)
52 return mode == PHY_MODE_MII ||
53 mode == PHY_MODE_RMII ||
54 mode == PHY_MODE_SMII ||
58 static inline const char *zmii_mode_name(int mode)
72 static inline u32 zmii_mode_mask(int mode, int input)
76 return ZMII_FER_MII(input);
78 return ZMII_FER_RMII(input);
80 return ZMII_FER_SMII(input);
86 int zmii_attach(struct platform_device *ofdev, int input, int *mode)
88 struct zmii_instance *dev = platform_get_drvdata(ofdev);
89 struct zmii_regs __iomem *p = dev->base;
91 ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
93 if (!zmii_valid_mode(*mode)) {
94 /* Probably an EMAC connected to RGMII,
95 * but it still may need ZMII for MDIO so
102 mutex_lock(&dev->lock);
104 /* Autodetect ZMII mode if not specified.
105 * This is only for backward compatibility with the old driver.
106 * Please, always specify PHY mode in your board port to avoid
109 if (dev->mode == PHY_MODE_NA) {
110 if (*mode == PHY_MODE_NA) {
111 u32 r = dev->fer_save;
113 ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
115 if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
116 dev->mode = PHY_MODE_MII;
117 else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
118 dev->mode = PHY_MODE_RMII;
120 dev->mode = PHY_MODE_SMII;
124 printk(KERN_NOTICE "%s: bridge in %s mode\n",
125 ofdev->dev.of_node->full_name,
126 zmii_mode_name(dev->mode));
128 /* All inputs must use the same mode */
129 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
131 "%s: invalid mode %d specified for input %d\n",
132 ofdev->dev.of_node->full_name, *mode, input);
133 mutex_unlock(&dev->lock);
138 /* Report back correct PHY mode,
139 * it may be used during PHY initialization.
143 /* Enable this input */
144 out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
147 mutex_unlock(&dev->lock);
152 void zmii_get_mdio(struct platform_device *ofdev, int input)
154 struct zmii_instance *dev = platform_get_drvdata(ofdev);
157 ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
159 mutex_lock(&dev->lock);
161 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
162 out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
165 void zmii_put_mdio(struct platform_device *ofdev, int input)
167 struct zmii_instance *dev = platform_get_drvdata(ofdev);
169 ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
170 mutex_unlock(&dev->lock);
174 void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
176 struct zmii_instance *dev = platform_get_drvdata(ofdev);
179 mutex_lock(&dev->lock);
181 ssr = in_be32(&dev->base->ssr);
183 ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
185 if (speed == SPEED_100)
186 ssr |= ZMII_SSR_SP(input);
188 ssr &= ~ZMII_SSR_SP(input);
190 out_be32(&dev->base->ssr, ssr);
192 mutex_unlock(&dev->lock);
195 void zmii_detach(struct platform_device *ofdev, int input)
197 struct zmii_instance *dev = platform_get_drvdata(ofdev);
199 BUG_ON(!dev || dev->users == 0);
201 mutex_lock(&dev->lock);
203 ZMII_DBG(dev, "detach(%d)" NL, input);
205 /* Disable this input */
206 out_be32(&dev->base->fer,
207 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
211 mutex_unlock(&dev->lock);
214 int zmii_get_regs_len(struct platform_device *ofdev)
216 return sizeof(struct emac_ethtool_regs_subhdr) +
217 sizeof(struct zmii_regs);
220 void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
222 struct zmii_instance *dev = platform_get_drvdata(ofdev);
223 struct emac_ethtool_regs_subhdr *hdr = buf;
224 struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
227 hdr->index = 0; /* for now, are there chips with more than one
228 * zmii ? if yes, then we'll add a cell_index
229 * like we do for emac
231 memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
235 static int zmii_probe(struct platform_device *ofdev)
237 struct device_node *np = ofdev->dev.of_node;
238 struct zmii_instance *dev;
239 struct resource regs;
243 dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
247 mutex_init(&dev->lock);
249 dev->mode = PHY_MODE_NA;
252 if (of_address_to_resource(np, 0, ®s)) {
253 printk(KERN_ERR "%s: Can't get registers address\n",
259 dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
260 sizeof(struct zmii_regs));
261 if (dev->base == NULL) {
262 printk(KERN_ERR "%s: Can't map device registers!\n",
267 /* We may need FER value for autodetection later */
268 dev->fer_save = in_be32(&dev->base->fer);
270 /* Disable all inputs by default */
271 out_be32(&dev->base->fer, 0);
274 "ZMII %s initialized\n", ofdev->dev.of_node->full_name);
276 platform_set_drvdata(ofdev, dev);
286 static int zmii_remove(struct platform_device *ofdev)
288 struct zmii_instance *dev = platform_get_drvdata(ofdev);
290 WARN_ON(dev->users != 0);
298 static const struct of_device_id zmii_match[] =
301 .compatible = "ibm,zmii",
303 /* For backward compat with old DT */
310 static struct platform_driver zmii_driver = {
313 .of_match_table = zmii_match,
316 .remove = zmii_remove,
319 int __init zmii_init(void)
321 return platform_driver_register(&zmii_driver);
326 platform_driver_unregister(&zmii_driver);