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

  1 /*
  2  * drivers/net/ethernet/ibm/emac/rgmii.c
  3  *
  4  * Driver for PowerPC 4xx on-chip ethernet controller, RGMII 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  *      Matt Porter <mporter@kernel.crashing.org>
 16  *      Copyright 2004 MontaVista Software, 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 "debug.h"
 32 
 33 // XXX FIXME: Axon seems to support a subset of the RGMII, we
 34 // thus need to take that into account and possibly change some
 35 // of the bit settings below that don't seem to quite match the
 36 // AXON spec
 37 
 38 /* RGMIIx_FER */
 39 #define RGMII_FER_MASK(idx)     (0x7 << ((idx) * 4))
 40 #define RGMII_FER_RTBI(idx)     (0x4 << ((idx) * 4))
 41 #define RGMII_FER_RGMII(idx)    (0x5 << ((idx) * 4))
 42 #define RGMII_FER_TBI(idx)      (0x6 << ((idx) * 4))
 43 #define RGMII_FER_GMII(idx)     (0x7 << ((idx) * 4))
 44 #define RGMII_FER_MII(idx)      RGMII_FER_GMII(idx)
 45 
 46 /* RGMIIx_SSR */
 47 #define RGMII_SSR_MASK(idx)     (0x7 << ((idx) * 8))
 48 #define RGMII_SSR_10(idx)       (0x1 << ((idx) * 8))
 49 #define RGMII_SSR_100(idx)      (0x2 << ((idx) * 8))
 50 #define RGMII_SSR_1000(idx)     (0x4 << ((idx) * 8))
 51 
 52 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
 53 static inline int rgmii_valid_mode(int phy_mode)
 54 {
 55         return  phy_mode == PHY_MODE_GMII ||
 56                 phy_mode == PHY_MODE_MII ||
 57                 phy_mode == PHY_MODE_RGMII ||
 58                 phy_mode == PHY_MODE_TBI ||
 59                 phy_mode == PHY_MODE_RTBI;
 60 }
 61 
 62 static inline const char *rgmii_mode_name(int mode)
 63 {
 64         switch (mode) {
 65         case PHY_MODE_RGMII:
 66                 return "RGMII";
 67         case PHY_MODE_TBI:
 68                 return "TBI";
 69         case PHY_MODE_GMII:
 70                 return "GMII";
 71         case PHY_MODE_MII:
 72                 return "MII";
 73         case PHY_MODE_RTBI:
 74                 return "RTBI";
 75         default:
 76                 BUG();
 77         }
 78 }
 79 
 80 static inline u32 rgmii_mode_mask(int mode, int input)
 81 {
 82         switch (mode) {
 83         case PHY_MODE_RGMII:
 84                 return RGMII_FER_RGMII(input);
 85         case PHY_MODE_TBI:
 86                 return RGMII_FER_TBI(input);
 87         case PHY_MODE_GMII:
 88                 return RGMII_FER_GMII(input);
 89         case PHY_MODE_MII:
 90                 return RGMII_FER_MII(input);
 91         case PHY_MODE_RTBI:
 92                 return RGMII_FER_RTBI(input);
 93         default:
 94                 BUG();
 95         }
 96 }
 97 
 98 int rgmii_attach(struct platform_device *ofdev, int input, int mode)
 99 {
100         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
101         struct rgmii_regs __iomem *p = dev->base;
102 
103         RGMII_DBG(dev, "attach(%d)" NL, input);
104 
105         /* Check if we need to attach to a RGMII */
106         if (input < 0 || !rgmii_valid_mode(mode)) {
107                 printk(KERN_ERR "%s: unsupported settings !\n",
108                        ofdev->dev.of_node->full_name);
109                 return -ENODEV;
110         }
111 
112         mutex_lock(&dev->lock);
113 
114         /* Enable this input */
115         out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
116 
117         printk(KERN_NOTICE "%s: input %d in %s mode\n",
118                ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));
119 
120         ++dev->users;
121 
122         mutex_unlock(&dev->lock);
123 
124         return 0;
125 }
126 
127 void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
128 {
129         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
130         struct rgmii_regs __iomem *p = dev->base;
131         u32 ssr;
132 
133         mutex_lock(&dev->lock);
134 
135         ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
136 
137         RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
138 
139         if (speed == SPEED_1000)
140                 ssr |= RGMII_SSR_1000(input);
141         else if (speed == SPEED_100)
142                 ssr |= RGMII_SSR_100(input);
143         else if (speed == SPEED_10)
144                 ssr |= RGMII_SSR_10(input);
145 
146         out_be32(&p->ssr, ssr);
147 
148         mutex_unlock(&dev->lock);
149 }
150 
151 void rgmii_get_mdio(struct platform_device *ofdev, int input)
152 {
153         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
154         struct rgmii_regs __iomem *p = dev->base;
155         u32 fer;
156 
157         RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
158 
159         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
160                 return;
161 
162         mutex_lock(&dev->lock);
163 
164         fer = in_be32(&p->fer);
165         fer |= 0x00080000u >> input;
166         out_be32(&p->fer, fer);
167         (void)in_be32(&p->fer);
168 
169         DBG2(dev, " fer = 0x%08x\n", fer);
170 }
171 
172 void rgmii_put_mdio(struct platform_device *ofdev, int input)
173 {
174         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
175         struct rgmii_regs __iomem *p = dev->base;
176         u32 fer;
177 
178         RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
179 
180         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
181                 return;
182 
183         fer = in_be32(&p->fer);
184         fer &= ~(0x00080000u >> input);
185         out_be32(&p->fer, fer);
186         (void)in_be32(&p->fer);
187 
188         DBG2(dev, " fer = 0x%08x\n", fer);
189 
190         mutex_unlock(&dev->lock);
191 }
192 
193 void rgmii_detach(struct platform_device *ofdev, int input)
194 {
195         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
196         struct rgmii_regs __iomem *p;
197 
198         BUG_ON(!dev || dev->users == 0);
199         p = dev->base;
200 
201         mutex_lock(&dev->lock);
202 
203         RGMII_DBG(dev, "detach(%d)" NL, input);
204 
205         /* Disable this input */
206         out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
207 
208         --dev->users;
209 
210         mutex_unlock(&dev->lock);
211 }
212 
213 int rgmii_get_regs_len(struct platform_device *ofdev)
214 {
215         return sizeof(struct emac_ethtool_regs_subhdr) +
216                 sizeof(struct rgmii_regs);
217 }
218 
219 void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
220 {
221         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
222         struct emac_ethtool_regs_subhdr *hdr = buf;
223         struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
224 
225         hdr->version = 0;
226         hdr->index = 0; /* for now, are there chips with more than one
227                          * rgmii ? if yes, then we'll add a cell_index
228                          * like we do for emac
229                          */
230         memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
231         return regs + 1;
232 }
233 
234 
235 static int rgmii_probe(struct platform_device *ofdev)
236 {
237         struct device_node *np = ofdev->dev.of_node;
238         struct rgmii_instance *dev;
239         struct resource regs;
240         int rc;
241 
242         rc = -ENOMEM;
243         dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
244         if (dev == NULL)
245                 goto err_gone;
246 
247         mutex_init(&dev->lock);
248         dev->ofdev = ofdev;
249 
250         rc = -ENXIO;
251         if (of_address_to_resource(np, 0, &regs)) {
252                 printk(KERN_ERR "%s: Can't get registers address\n",
253                        np->full_name);
254                 goto err_free;
255         }
256 
257         rc = -ENOMEM;
258         dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
259                                                  sizeof(struct rgmii_regs));
260         if (dev->base == NULL) {
261                 printk(KERN_ERR "%s: Can't map device registers!\n",
262                        np->full_name);
263                 goto err_free;
264         }
265 
266         /* Check for RGMII flags */
267         if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
268                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
269 
270         /* CAB lacks the right properties, fix this up */
271         if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
272                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
273 
274         DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
275              in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
276 
277         /* Disable all inputs by default */
278         out_be32(&dev->base->fer, 0);
279 
280         printk(KERN_INFO
281                "RGMII %s initialized with%s MDIO support\n",
282                ofdev->dev.of_node->full_name,
283                (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
284 
285         wmb();
286         platform_set_drvdata(ofdev, dev);
287 
288         return 0;
289 
290  err_free:
291         kfree(dev);
292  err_gone:
293         return rc;
294 }
295 
296 static int rgmii_remove(struct platform_device *ofdev)
297 {
298         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
299 
300         WARN_ON(dev->users != 0);
301 
302         iounmap(dev->base);
303         kfree(dev);
304 
305         return 0;
306 }
307 
308 static struct of_device_id rgmii_match[] =
309 {
310         {
311                 .compatible     = "ibm,rgmii",
312         },
313         {
314                 .type           = "emac-rgmii",
315         },
316         {},
317 };
318 
319 static struct platform_driver rgmii_driver = {
320         .driver = {
321                 .name = "emac-rgmii",
322                 .owner = THIS_MODULE,
323                 .of_match_table = rgmii_match,
324         },
325         .probe = rgmii_probe,
326         .remove = rgmii_remove,
327 };
328 
329 int __init rgmii_init(void)
330 {
331         return platform_driver_register(&rgmii_driver);
332 }
333 
334 void rgmii_exit(void)
335 {
336         platform_driver_unregister(&rgmii_driver);
337 }
338 

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