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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_100(idx)      (0x2 << ((idx) * 8))
 49 #define RGMII_SSR_1000(idx)     (0x4 << ((idx) * 8))
 50 
 51 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
 52 static inline int rgmii_valid_mode(int phy_mode)
 53 {
 54         return  phy_mode == PHY_MODE_GMII ||
 55                 phy_mode == PHY_MODE_MII ||
 56                 phy_mode == PHY_MODE_RGMII ||
 57                 phy_mode == PHY_MODE_TBI ||
 58                 phy_mode == PHY_MODE_RTBI;
 59 }
 60 
 61 static inline const char *rgmii_mode_name(int mode)
 62 {
 63         switch (mode) {
 64         case PHY_MODE_RGMII:
 65                 return "RGMII";
 66         case PHY_MODE_TBI:
 67                 return "TBI";
 68         case PHY_MODE_GMII:
 69                 return "GMII";
 70         case PHY_MODE_MII:
 71                 return "MII";
 72         case PHY_MODE_RTBI:
 73                 return "RTBI";
 74         default:
 75                 BUG();
 76         }
 77 }
 78 
 79 static inline u32 rgmii_mode_mask(int mode, int input)
 80 {
 81         switch (mode) {
 82         case PHY_MODE_RGMII:
 83                 return RGMII_FER_RGMII(input);
 84         case PHY_MODE_TBI:
 85                 return RGMII_FER_TBI(input);
 86         case PHY_MODE_GMII:
 87                 return RGMII_FER_GMII(input);
 88         case PHY_MODE_MII:
 89                 return RGMII_FER_MII(input);
 90         case PHY_MODE_RTBI:
 91                 return RGMII_FER_RTBI(input);
 92         default:
 93                 BUG();
 94         }
 95 }
 96 
 97 int rgmii_attach(struct platform_device *ofdev, int input, int mode)
 98 {
 99         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
100         struct rgmii_regs __iomem *p = dev->base;
101 
102         RGMII_DBG(dev, "attach(%d)" NL, input);
103 
104         /* Check if we need to attach to a RGMII */
105         if (input < 0 || !rgmii_valid_mode(mode)) {
106                 printk(KERN_ERR "%s: unsupported settings !\n",
107                        ofdev->dev.of_node->full_name);
108                 return -ENODEV;
109         }
110 
111         mutex_lock(&dev->lock);
112 
113         /* Enable this input */
114         out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
115 
116         printk(KERN_NOTICE "%s: input %d in %s mode\n",
117                ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));
118 
119         ++dev->users;
120 
121         mutex_unlock(&dev->lock);
122 
123         return 0;
124 }
125 
126 void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
127 {
128         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
129         struct rgmii_regs __iomem *p = dev->base;
130         u32 ssr;
131 
132         mutex_lock(&dev->lock);
133 
134         ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
135 
136         RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
137 
138         if (speed == SPEED_1000)
139                 ssr |= RGMII_SSR_1000(input);
140         else if (speed == SPEED_100)
141                 ssr |= RGMII_SSR_100(input);
142 
143         out_be32(&p->ssr, ssr);
144 
145         mutex_unlock(&dev->lock);
146 }
147 
148 void rgmii_get_mdio(struct platform_device *ofdev, int input)
149 {
150         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
151         struct rgmii_regs __iomem *p = dev->base;
152         u32 fer;
153 
154         RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
155 
156         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
157                 return;
158 
159         mutex_lock(&dev->lock);
160 
161         fer = in_be32(&p->fer);
162         fer |= 0x00080000u >> input;
163         out_be32(&p->fer, fer);
164         (void)in_be32(&p->fer);
165 
166         DBG2(dev, " fer = 0x%08x\n", fer);
167 }
168 
169 void rgmii_put_mdio(struct platform_device *ofdev, int input)
170 {
171         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
172         struct rgmii_regs __iomem *p = dev->base;
173         u32 fer;
174 
175         RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
176 
177         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
178                 return;
179 
180         fer = in_be32(&p->fer);
181         fer &= ~(0x00080000u >> input);
182         out_be32(&p->fer, fer);
183         (void)in_be32(&p->fer);
184 
185         DBG2(dev, " fer = 0x%08x\n", fer);
186 
187         mutex_unlock(&dev->lock);
188 }
189 
190 void rgmii_detach(struct platform_device *ofdev, int input)
191 {
192         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
193         struct rgmii_regs __iomem *p;
194 
195         BUG_ON(!dev || dev->users == 0);
196         p = dev->base;
197 
198         mutex_lock(&dev->lock);
199 
200         RGMII_DBG(dev, "detach(%d)" NL, input);
201 
202         /* Disable this input */
203         out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
204 
205         --dev->users;
206 
207         mutex_unlock(&dev->lock);
208 }
209 
210 int rgmii_get_regs_len(struct platform_device *ofdev)
211 {
212         return sizeof(struct emac_ethtool_regs_subhdr) +
213                 sizeof(struct rgmii_regs);
214 }
215 
216 void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
217 {
218         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
219         struct emac_ethtool_regs_subhdr *hdr = buf;
220         struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
221 
222         hdr->version = 0;
223         hdr->index = 0; /* for now, are there chips with more than one
224                          * rgmii ? if yes, then we'll add a cell_index
225                          * like we do for emac
226                          */
227         memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
228         return regs + 1;
229 }
230 
231 
232 static int rgmii_probe(struct platform_device *ofdev)
233 {
234         struct device_node *np = ofdev->dev.of_node;
235         struct rgmii_instance *dev;
236         struct resource regs;
237         int rc;
238 
239         rc = -ENOMEM;
240         dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
241         if (dev == NULL)
242                 goto err_gone;
243 
244         mutex_init(&dev->lock);
245         dev->ofdev = ofdev;
246 
247         rc = -ENXIO;
248         if (of_address_to_resource(np, 0, &regs)) {
249                 printk(KERN_ERR "%s: Can't get registers address\n",
250                        np->full_name);
251                 goto err_free;
252         }
253 
254         rc = -ENOMEM;
255         dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
256                                                  sizeof(struct rgmii_regs));
257         if (dev->base == NULL) {
258                 printk(KERN_ERR "%s: Can't map device registers!\n",
259                        np->full_name);
260                 goto err_free;
261         }
262 
263         /* Check for RGMII flags */
264         if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
265                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
266 
267         /* CAB lacks the right properties, fix this up */
268         if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
269                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
270 
271         DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
272              in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
273 
274         /* Disable all inputs by default */
275         out_be32(&dev->base->fer, 0);
276 
277         printk(KERN_INFO
278                "RGMII %s initialized with%s MDIO support\n",
279                ofdev->dev.of_node->full_name,
280                (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
281 
282         wmb();
283         platform_set_drvdata(ofdev, dev);
284 
285         return 0;
286 
287  err_free:
288         kfree(dev);
289  err_gone:
290         return rc;
291 }
292 
293 static int rgmii_remove(struct platform_device *ofdev)
294 {
295         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
296 
297         WARN_ON(dev->users != 0);
298 
299         iounmap(dev->base);
300         kfree(dev);
301 
302         return 0;
303 }
304 
305 static struct of_device_id rgmii_match[] =
306 {
307         {
308                 .compatible     = "ibm,rgmii",
309         },
310         {
311                 .type           = "emac-rgmii",
312         },
313         {},
314 };
315 
316 static struct platform_driver rgmii_driver = {
317         .driver = {
318                 .name = "emac-rgmii",
319                 .owner = THIS_MODULE,
320                 .of_match_table = rgmii_match,
321         },
322         .probe = rgmii_probe,
323         .remove = rgmii_remove,
324 };
325 
326 int __init rgmii_init(void)
327 {
328         return platform_driver_register(&rgmii_driver);
329 }
330 
331 void rgmii_exit(void)
332 {
333         platform_driver_unregister(&rgmii_driver);
334 }
335 

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