1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
45 static inline int zmii_valid_mode(int mode)  in zmii_valid_mode()  argument
47 	return  mode == PHY_INTERFACE_MODE_MII ||  in zmii_valid_mode()
48 		mode == PHY_INTERFACE_MODE_RMII ||  in zmii_valid_mode()
49 		mode == PHY_INTERFACE_MODE_SMII ||  in zmii_valid_mode()
50 		mode == PHY_INTERFACE_MODE_NA;  in zmii_valid_mode()
53 static inline const char *zmii_mode_name(int mode)  in zmii_mode_name()  argument
55 	switch (mode) {  in zmii_mode_name()
67 static inline u32 zmii_mode_mask(int mode, int input)  in zmii_mode_mask()  argument
69 	switch (mode) {  in zmii_mode_mask()
71 		return ZMII_FER_MII(input);  in zmii_mode_mask()
73 		return ZMII_FER_RMII(input);  in zmii_mode_mask()
75 		return ZMII_FER_SMII(input);  in zmii_mode_mask()
81 int zmii_attach(struct platform_device *ofdev, int input,  in zmii_attach()  argument
82 		phy_interface_t *mode)  in zmii_attach()  argument
85 	struct zmii_regs __iomem *p = dev->base;  in zmii_attach()
87 	ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);  in zmii_attach()
89 	if (!zmii_valid_mode(*mode)) {  in zmii_attach()
94 		dev->users++;  in zmii_attach()
98 	mutex_lock(&dev->lock);  in zmii_attach()
100 	/* Autodetect ZMII mode if not specified.  in zmii_attach()
102 	 * Please, always specify PHY mode in your board port to avoid  in zmii_attach()
105 	if (dev->mode == PHY_INTERFACE_MODE_NA) {  in zmii_attach()
106 		if (*mode == PHY_INTERFACE_MODE_NA) {  in zmii_attach()
107 			u32 r = dev->fer_save;  in zmii_attach()
109 			ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);  in zmii_attach()
112 				dev->mode = PHY_INTERFACE_MODE_MII;  in zmii_attach()
114 				dev->mode = PHY_INTERFACE_MODE_RMII;  in zmii_attach()
116 				dev->mode = PHY_INTERFACE_MODE_SMII;  in zmii_attach()
118 			dev->mode = *mode;  in zmii_attach()
120 		printk(KERN_NOTICE "%pOF: bridge in %s mode\n",  in zmii_attach()
121 		       ofdev->dev.of_node,  in zmii_attach()
122 		       zmii_mode_name(dev->mode));  in zmii_attach()
124 		/* All inputs must use the same mode */  in zmii_attach()
125 		if (*mode != PHY_INTERFACE_MODE_NA && *mode != dev->mode) {  in zmii_attach()
127 			       "%pOF: invalid mode %d specified for input %d\n",  in zmii_attach()
128 			       ofdev->dev.of_node, *mode, input);  in zmii_attach()
129 			mutex_unlock(&dev->lock);  in zmii_attach()
130 			return -EINVAL;  in zmii_attach()
134 	/* Report back correct PHY mode,  in zmii_attach()
137 	*mode = dev->mode;  in zmii_attach()
139 	/* Enable this input */  in zmii_attach()
140 	out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));  in zmii_attach()
141 	++dev->users;  in zmii_attach()
143 	mutex_unlock(&dev->lock);  in zmii_attach()
148 void zmii_get_mdio(struct platform_device *ofdev, int input)  in zmii_get_mdio()  argument
153 	ZMII_DBG2(dev, "get_mdio(%d)" NL, input);  in zmii_get_mdio()
155 	mutex_lock(&dev->lock);  in zmii_get_mdio()
157 	fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;  in zmii_get_mdio()
158 	out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));  in zmii_get_mdio()
161 void zmii_put_mdio(struct platform_device *ofdev, int input)  in zmii_put_mdio()  argument
165 	ZMII_DBG2(dev, "put_mdio(%d)" NL, input);  in zmii_put_mdio()
166 	mutex_unlock(&dev->lock);  in zmii_put_mdio()
170 void zmii_set_speed(struct platform_device *ofdev, int input, int speed)  in zmii_set_speed()  argument
175 	mutex_lock(&dev->lock);  in zmii_set_speed()
177 	ssr = in_be32(&dev->base->ssr);  in zmii_set_speed()
179 	ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);  in zmii_set_speed()
182 		ssr |= ZMII_SSR_SP(input);  in zmii_set_speed()
184 		ssr &= ~ZMII_SSR_SP(input);  in zmii_set_speed()
186 	out_be32(&dev->base->ssr, ssr);  in zmii_set_speed()
188 	mutex_unlock(&dev->lock);  in zmii_set_speed()
191 void zmii_detach(struct platform_device *ofdev, int input)  in zmii_detach()  argument
195 	BUG_ON(!dev || dev->users == 0);  in zmii_detach()
197 	mutex_lock(&dev->lock);  in zmii_detach()
199 	ZMII_DBG(dev, "detach(%d)" NL, input);  in zmii_detach()
201 	/* Disable this input */  in zmii_detach()
202 	out_be32(&dev->base->fer,  in zmii_detach()
203 		 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));  in zmii_detach()
205 	--dev->users;  in zmii_detach()
207 	mutex_unlock(&dev->lock);  in zmii_detach()
222 	hdr->version = 0;  in zmii_dump_regs()
223 	hdr->index = 0; /* for now, are there chips with more than one  in zmii_dump_regs()
227 	memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));  in zmii_dump_regs()
233 	struct device_node *np = ofdev->dev.of_node;  in zmii_probe()
238 	rc = -ENOMEM;  in zmii_probe()
243 	mutex_init(&dev->lock);  in zmii_probe()
244 	dev->ofdev = ofdev;  in zmii_probe()
245 	dev->mode = PHY_INTERFACE_MODE_NA;  in zmii_probe()
247 	rc = -ENXIO;  in zmii_probe()
253 	rc = -ENOMEM;  in zmii_probe()
254 	dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,  in zmii_probe()
256 	if (dev->base == NULL) {  in zmii_probe()
262 	dev->fer_save = in_be32(&dev->base->fer);  in zmii_probe()
265 	out_be32(&dev->base->fer, 0);  in zmii_probe()
267 	printk(KERN_INFO "ZMII %pOF initialized\n", ofdev->dev.of_node);  in zmii_probe()
283 	WARN_ON(dev->users != 0);  in zmii_remove()
285 	iounmap(dev->base);  in zmii_remove()
298 		.type		= "emac-zmii",
305 		.name = "emac-zmii",