1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * drivers/net/ethernet/ibm/emac/rgmii.c
5  * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
30 // XXX FIXME: Axon seems to support a subset of the RGMII, we
31 // thus need to take that into account and possibly change some
32 // of the bit settings below that don't seem to quite match the
49 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
83 	struct rgmii_regs __iomem *p = dev->base;  in rgmii_attach()
87 	/* Check if we need to attach to a RGMII */  in rgmii_attach()
90 		       ofdev->dev.of_node);  in rgmii_attach()
91 		return -ENODEV;  in rgmii_attach()
94 	mutex_lock(&dev->lock);  in rgmii_attach()
97 	out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));  in rgmii_attach()
100 	       ofdev->dev.of_node, input, phy_modes(mode));  in rgmii_attach()
102 	++dev->users;  in rgmii_attach()
104 	mutex_unlock(&dev->lock);  in rgmii_attach()
112 	struct rgmii_regs __iomem *p = dev->base;  in rgmii_set_speed()
115 	mutex_lock(&dev->lock);  in rgmii_set_speed()
117 	ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);  in rgmii_set_speed()
128 	out_be32(&p->ssr, ssr);  in rgmii_set_speed()
130 	mutex_unlock(&dev->lock);  in rgmii_set_speed()
136 	struct rgmii_regs __iomem *p = dev->base;  in rgmii_get_mdio()
141 	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))  in rgmii_get_mdio()
144 	mutex_lock(&dev->lock);  in rgmii_get_mdio()
146 	fer = in_be32(&p->fer);  in rgmii_get_mdio()
148 	out_be32(&p->fer, fer);  in rgmii_get_mdio()
149 	(void)in_be32(&p->fer);  in rgmii_get_mdio()
157 	struct rgmii_regs __iomem *p = dev->base;  in rgmii_put_mdio()
162 	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))  in rgmii_put_mdio()
165 	fer = in_be32(&p->fer);  in rgmii_put_mdio()
167 	out_be32(&p->fer, fer);  in rgmii_put_mdio()
168 	(void)in_be32(&p->fer);  in rgmii_put_mdio()
172 	mutex_unlock(&dev->lock);  in rgmii_put_mdio()
180 	BUG_ON(!dev || dev->users == 0);  in rgmii_detach()
181 	p = dev->base;  in rgmii_detach()
183 	mutex_lock(&dev->lock);  in rgmii_detach()
188 	out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));  in rgmii_detach()
190 	--dev->users;  in rgmii_detach()
192 	mutex_unlock(&dev->lock);  in rgmii_detach()
207 	hdr->version = 0;  in rgmii_dump_regs()
208 	hdr->index = 0; /* for now, are there chips with more than one  in rgmii_dump_regs()
209 			 * rgmii ? if yes, then we'll add a cell_index  in rgmii_dump_regs()
212 	memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));  in rgmii_dump_regs()
222 	dev = devm_kzalloc(&ofdev->dev, sizeof(struct rgmii_instance),  in rgmii_probe()
225 		return -ENOMEM;  in rgmii_probe()
227 	err = devm_mutex_init(&ofdev->dev, &dev->lock);  in rgmii_probe()
231 	dev->ofdev = ofdev;  in rgmii_probe()
233 	dev->base = devm_platform_ioremap_resource(ofdev, 0);  in rgmii_probe()
234 	if (IS_ERR(dev->base)) {  in rgmii_probe()
235 		dev_err(&ofdev->dev, "can't map device registers");  in rgmii_probe()
236 		return PTR_ERR(dev->base);  in rgmii_probe()
239 	/* Check for RGMII flags */  in rgmii_probe()
240 	if (of_property_read_bool(ofdev->dev.of_node, "has-mdio"))  in rgmii_probe()
241 		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;  in rgmii_probe()
244 	if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))  in rgmii_probe()
245 		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;  in rgmii_probe()
248 	     in_be32(&dev->base->fer), in_be32(&dev->base->ssr));  in rgmii_probe()
251 	out_be32(&dev->base->fer, 0);  in rgmii_probe()
254 	       "RGMII %pOF initialized with%s MDIO support\n",  in rgmii_probe()
255 	       ofdev->dev.of_node,  in rgmii_probe()
256 	       (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");  in rgmii_probe()
267 		.compatible	= "ibm,rgmii",
270 		.type		= "emac-rgmii",
277 		.name = "emac-rgmii",