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Linux/drivers/net/ethernet/ibm/emac/zmii.c

  1 /*
  2  * drivers/net/ethernet/ibm/emac/zmii.c
  3  *
  4  * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
  5  *
  6  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
  7  *                <benh@kernel.crashing.org>
  8  *
  9  * Based on the arch/ppc version of the driver:
 10  *
 11  * Copyright (c) 2004, 2005 Zultys Technologies.
 12  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 13  *
 14  * Based on original work by
 15  *      Armin Kuster <akuster@mvista.com>
 16  *      Copyright 2001 MontaVista Softare Inc.
 17  *
 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.
 22  *
 23  */
 24 #include <linux/slab.h>
 25 #include <linux/kernel.h>
 26 #include <linux/ethtool.h>
 27 #include <linux/of_address.h>
 28 #include <asm/io.h>
 29 
 30 #include "emac.h"
 31 #include "core.h"
 32 
 33 /* ZMIIx_FER */
 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))
 37 
 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))
 41 
 42 /* ZMIIx_SSR */
 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))
 46 
 47 /* ZMII only supports MII, RMII and SMII
 48  * we also support autodetection for backward compatibility
 49  */
 50 static inline int zmii_valid_mode(int mode)
 51 {
 52         return  mode == PHY_MODE_MII ||
 53                 mode == PHY_MODE_RMII ||
 54                 mode == PHY_MODE_SMII ||
 55                 mode == PHY_MODE_NA;
 56 }
 57 
 58 static inline const char *zmii_mode_name(int mode)
 59 {
 60         switch (mode) {
 61         case PHY_MODE_MII:
 62                 return "MII";
 63         case PHY_MODE_RMII:
 64                 return "RMII";
 65         case PHY_MODE_SMII:
 66                 return "SMII";
 67         default:
 68                 BUG();
 69         }
 70 }
 71 
 72 static inline u32 zmii_mode_mask(int mode, int input)
 73 {
 74         switch (mode) {
 75         case PHY_MODE_MII:
 76                 return ZMII_FER_MII(input);
 77         case PHY_MODE_RMII:
 78                 return ZMII_FER_RMII(input);
 79         case PHY_MODE_SMII:
 80                 return ZMII_FER_SMII(input);
 81         default:
 82                 return 0;
 83         }
 84 }
 85 
 86 int zmii_attach(struct platform_device *ofdev, int input, int *mode)
 87 {
 88         struct zmii_instance *dev = platform_get_drvdata(ofdev);
 89         struct zmii_regs __iomem *p = dev->base;
 90 
 91         ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
 92 
 93         if (!zmii_valid_mode(*mode)) {
 94                 /* Probably an EMAC connected to RGMII,
 95                  * but it still may need ZMII for MDIO so
 96                  * we don't fail here.
 97                  */
 98                 dev->users++;
 99                 return 0;
100         }
101 
102         mutex_lock(&dev->lock);
103 
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
107          * any surprises.
108          */
109         if (dev->mode == PHY_MODE_NA) {
110                 if (*mode == PHY_MODE_NA) {
111                         u32 r = dev->fer_save;
112 
113                         ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
114 
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;
119                         else
120                                 dev->mode = PHY_MODE_SMII;
121                 } else
122                         dev->mode = *mode;
123 
124                 printk(KERN_NOTICE "%s: bridge in %s mode\n",
125                        ofdev->dev.of_node->full_name,
126                        zmii_mode_name(dev->mode));
127         } else {
128                 /* All inputs must use the same mode */
129                 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
130                         printk(KERN_ERR
131                                "%s: invalid mode %d specified for input %d\n",
132                                ofdev->dev.of_node->full_name, *mode, input);
133                         mutex_unlock(&dev->lock);
134                         return -EINVAL;
135                 }
136         }
137 
138         /* Report back correct PHY mode,
139          * it may be used during PHY initialization.
140          */
141         *mode = dev->mode;
142 
143         /* Enable this input */
144         out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
145         ++dev->users;
146 
147         mutex_unlock(&dev->lock);
148 
149         return 0;
150 }
151 
152 void zmii_get_mdio(struct platform_device *ofdev, int input)
153 {
154         struct zmii_instance *dev = platform_get_drvdata(ofdev);
155         u32 fer;
156 
157         ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
158 
159         mutex_lock(&dev->lock);
160 
161         fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
162         out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
163 }
164 
165 void zmii_put_mdio(struct platform_device *ofdev, int input)
166 {
167         struct zmii_instance *dev = platform_get_drvdata(ofdev);
168 
169         ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
170         mutex_unlock(&dev->lock);
171 }
172 
173 
174 void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
175 {
176         struct zmii_instance *dev = platform_get_drvdata(ofdev);
177         u32 ssr;
178 
179         mutex_lock(&dev->lock);
180 
181         ssr = in_be32(&dev->base->ssr);
182 
183         ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
184 
185         if (speed == SPEED_100)
186                 ssr |= ZMII_SSR_SP(input);
187         else
188                 ssr &= ~ZMII_SSR_SP(input);
189 
190         out_be32(&dev->base->ssr, ssr);
191 
192         mutex_unlock(&dev->lock);
193 }
194 
195 void zmii_detach(struct platform_device *ofdev, int input)
196 {
197         struct zmii_instance *dev = platform_get_drvdata(ofdev);
198 
199         BUG_ON(!dev || dev->users == 0);
200 
201         mutex_lock(&dev->lock);
202 
203         ZMII_DBG(dev, "detach(%d)" NL, input);
204 
205         /* Disable this input */
206         out_be32(&dev->base->fer,
207                  in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
208 
209         --dev->users;
210 
211         mutex_unlock(&dev->lock);
212 }
213 
214 int zmii_get_regs_len(struct platform_device *ofdev)
215 {
216         return sizeof(struct emac_ethtool_regs_subhdr) +
217                 sizeof(struct zmii_regs);
218 }
219 
220 void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
221 {
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);
225 
226         hdr->version = 0;
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
230                          */
231         memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
232         return regs + 1;
233 }
234 
235 static int zmii_probe(struct platform_device *ofdev)
236 {
237         struct device_node *np = ofdev->dev.of_node;
238         struct zmii_instance *dev;
239         struct resource regs;
240         int rc;
241 
242         rc = -ENOMEM;
243         dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
244         if (dev == NULL)
245                 goto err_gone;
246 
247         mutex_init(&dev->lock);
248         dev->ofdev = ofdev;
249         dev->mode = PHY_MODE_NA;
250 
251         rc = -ENXIO;
252         if (of_address_to_resource(np, 0, &regs)) {
253                 printk(KERN_ERR "%s: Can't get registers address\n",
254                        np->full_name);
255                 goto err_free;
256         }
257 
258         rc = -ENOMEM;
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",
263                        np->full_name);
264                 goto err_free;
265         }
266 
267         /* We may need FER value for autodetection later */
268         dev->fer_save = in_be32(&dev->base->fer);
269 
270         /* Disable all inputs by default */
271         out_be32(&dev->base->fer, 0);
272 
273         printk(KERN_INFO
274                "ZMII %s initialized\n", ofdev->dev.of_node->full_name);
275         wmb();
276         platform_set_drvdata(ofdev, dev);
277 
278         return 0;
279 
280  err_free:
281         kfree(dev);
282  err_gone:
283         return rc;
284 }
285 
286 static int zmii_remove(struct platform_device *ofdev)
287 {
288         struct zmii_instance *dev = platform_get_drvdata(ofdev);
289 
290         WARN_ON(dev->users != 0);
291 
292         iounmap(dev->base);
293         kfree(dev);
294 
295         return 0;
296 }
297 
298 static struct of_device_id zmii_match[] =
299 {
300         {
301                 .compatible     = "ibm,zmii",
302         },
303         /* For backward compat with old DT */
304         {
305                 .type           = "emac-zmii",
306         },
307         {},
308 };
309 
310 static struct platform_driver zmii_driver = {
311         .driver = {
312                 .name = "emac-zmii",
313                 .owner = THIS_MODULE,
314                 .of_match_table = zmii_match,
315         },
316         .probe = zmii_probe,
317         .remove = zmii_remove,
318 };
319 
320 int __init zmii_init(void)
321 {
322         return platform_driver_register(&zmii_driver);
323 }
324 
325 void zmii_exit(void)
326 {
327         platform_driver_unregister(&zmii_driver);
328 }
329 

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