xref: /openbmc/linux/drivers/net/phy/icplus.c (revision 92b19ff5)
1 /*
2  * Driver for ICPlus PHYs
3  *
4  * Copyright (c) 2007 Freescale Semiconductor, Inc.
5  *
6  * This program is free software; you can redistribute  it and/or modify it
7  * under  the terms of  the GNU General  Public License as published by the
8  * Free Software Foundation;  either version 2 of the  License, or (at your
9  * option) any later version.
10  *
11  */
12 #include <linux/kernel.h>
13 #include <linux/string.h>
14 #include <linux/errno.h>
15 #include <linux/unistd.h>
16 #include <linux/interrupt.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/skbuff.h>
22 #include <linux/spinlock.h>
23 #include <linux/mm.h>
24 #include <linux/module.h>
25 #include <linux/mii.h>
26 #include <linux/ethtool.h>
27 #include <linux/phy.h>
28 
29 #include <asm/io.h>
30 #include <asm/irq.h>
31 #include <asm/uaccess.h>
32 
33 MODULE_DESCRIPTION("ICPlus IP175C/IP101A/IP101G/IC1001 PHY drivers");
34 MODULE_AUTHOR("Michael Barkowski");
35 MODULE_LICENSE("GPL");
36 
37 /* IP101A/G - IP1001 */
38 #define IP10XX_SPEC_CTRL_STATUS		16	/* Spec. Control Register */
39 #define IP1001_RXPHASE_SEL		(1<<0)	/* Add delay on RX_CLK */
40 #define IP1001_TXPHASE_SEL		(1<<1)	/* Add delay on TX_CLK */
41 #define IP1001_SPEC_CTRL_STATUS_2	20	/* IP1001 Spec. Control Reg 2 */
42 #define IP1001_APS_ON			11	/* IP1001 APS Mode  bit */
43 #define IP101A_G_APS_ON			2	/* IP101A/G APS Mode bit */
44 #define IP101A_G_IRQ_CONF_STATUS	0x11	/* Conf Info IRQ & Status Reg */
45 #define	IP101A_G_IRQ_PIN_USED		(1<<15) /* INTR pin used */
46 #define	IP101A_G_IRQ_DEFAULT		IP101A_G_IRQ_PIN_USED
47 
48 static int ip175c_config_init(struct phy_device *phydev)
49 {
50 	int err, i;
51 	static int full_reset_performed;
52 
53 	if (full_reset_performed == 0) {
54 
55 		/* master reset */
56 		err = mdiobus_write(phydev->bus, 30, 0, 0x175c);
57 		if (err < 0)
58 			return err;
59 
60 		/* ensure no bus delays overlap reset period */
61 		err = mdiobus_read(phydev->bus, 30, 0);
62 
63 		/* data sheet specifies reset period is 2 msec */
64 		mdelay(2);
65 
66 		/* enable IP175C mode */
67 		err = mdiobus_write(phydev->bus, 29, 31, 0x175c);
68 		if (err < 0)
69 			return err;
70 
71 		/* Set MII0 speed and duplex (in PHY mode) */
72 		err = mdiobus_write(phydev->bus, 29, 22, 0x420);
73 		if (err < 0)
74 			return err;
75 
76 		/* reset switch ports */
77 		for (i = 0; i < 5; i++) {
78 			err = mdiobus_write(phydev->bus, i,
79 					    MII_BMCR, BMCR_RESET);
80 			if (err < 0)
81 				return err;
82 		}
83 
84 		for (i = 0; i < 5; i++)
85 			err = mdiobus_read(phydev->bus, i, MII_BMCR);
86 
87 		mdelay(2);
88 
89 		full_reset_performed = 1;
90 	}
91 
92 	if (phydev->addr != 4) {
93 		phydev->state = PHY_RUNNING;
94 		phydev->speed = SPEED_100;
95 		phydev->duplex = DUPLEX_FULL;
96 		phydev->link = 1;
97 		netif_carrier_on(phydev->attached_dev);
98 	}
99 
100 	return 0;
101 }
102 
103 static int ip1xx_reset(struct phy_device *phydev)
104 {
105 	int bmcr;
106 
107 	/* Software Reset PHY */
108 	bmcr = phy_read(phydev, MII_BMCR);
109 	if (bmcr < 0)
110 		return bmcr;
111 	bmcr |= BMCR_RESET;
112 	bmcr = phy_write(phydev, MII_BMCR, bmcr);
113 	if (bmcr < 0)
114 		return bmcr;
115 
116 	do {
117 		bmcr = phy_read(phydev, MII_BMCR);
118 		if (bmcr < 0)
119 			return bmcr;
120 	} while (bmcr & BMCR_RESET);
121 
122 	return 0;
123 }
124 
125 static int ip1001_config_init(struct phy_device *phydev)
126 {
127 	int c;
128 
129 	c = ip1xx_reset(phydev);
130 	if (c < 0)
131 		return c;
132 
133 	/* Enable Auto Power Saving mode */
134 	c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
135 	if (c < 0)
136 		return c;
137 	c |= IP1001_APS_ON;
138 	c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
139 	if (c < 0)
140 		return c;
141 
142 	if (phy_interface_is_rgmii(phydev)) {
143 
144 		c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
145 		if (c < 0)
146 			return c;
147 
148 		c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
149 
150 		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
151 			c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
152 		else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
153 			c |= IP1001_RXPHASE_SEL;
154 		else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
155 			c |= IP1001_TXPHASE_SEL;
156 
157 		c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
158 		if (c < 0)
159 			return c;
160 	}
161 
162 	return 0;
163 }
164 
165 static int ip101a_g_config_init(struct phy_device *phydev)
166 {
167 	int c;
168 
169 	c = ip1xx_reset(phydev);
170 	if (c < 0)
171 		return c;
172 
173 	/* INTR pin used: speed/link/duplex will cause an interrupt */
174 	c = phy_write(phydev, IP101A_G_IRQ_CONF_STATUS, IP101A_G_IRQ_DEFAULT);
175 	if (c < 0)
176 		return c;
177 
178 	/* Enable Auto Power Saving mode */
179 	c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
180 	c |= IP101A_G_APS_ON;
181 
182 	return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
183 }
184 
185 static int ip175c_read_status(struct phy_device *phydev)
186 {
187 	if (phydev->addr == 4) /* WAN port */
188 		genphy_read_status(phydev);
189 	else
190 		/* Don't need to read status for switch ports */
191 		phydev->irq = PHY_IGNORE_INTERRUPT;
192 
193 	return 0;
194 }
195 
196 static int ip175c_config_aneg(struct phy_device *phydev)
197 {
198 	if (phydev->addr == 4) /* WAN port */
199 		genphy_config_aneg(phydev);
200 
201 	return 0;
202 }
203 
204 static int ip101a_g_ack_interrupt(struct phy_device *phydev)
205 {
206 	int err = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
207 	if (err < 0)
208 		return err;
209 
210 	return 0;
211 }
212 
213 static struct phy_driver icplus_driver[] = {
214 {
215 	.phy_id		= 0x02430d80,
216 	.name		= "ICPlus IP175C",
217 	.phy_id_mask	= 0x0ffffff0,
218 	.features	= PHY_BASIC_FEATURES,
219 	.config_init	= &ip175c_config_init,
220 	.config_aneg	= &ip175c_config_aneg,
221 	.read_status	= &ip175c_read_status,
222 	.suspend	= genphy_suspend,
223 	.resume		= genphy_resume,
224 	.driver		= { .owner = THIS_MODULE,},
225 }, {
226 	.phy_id		= 0x02430d90,
227 	.name		= "ICPlus IP1001",
228 	.phy_id_mask	= 0x0ffffff0,
229 	.features	= PHY_GBIT_FEATURES | SUPPORTED_Pause |
230 			  SUPPORTED_Asym_Pause,
231 	.config_init	= &ip1001_config_init,
232 	.config_aneg	= &genphy_config_aneg,
233 	.read_status	= &genphy_read_status,
234 	.suspend	= genphy_suspend,
235 	.resume		= genphy_resume,
236 	.driver		= { .owner = THIS_MODULE,},
237 }, {
238 	.phy_id		= 0x02430c54,
239 	.name		= "ICPlus IP101A/G",
240 	.phy_id_mask	= 0x0ffffff0,
241 	.features	= PHY_BASIC_FEATURES | SUPPORTED_Pause |
242 			  SUPPORTED_Asym_Pause,
243 	.flags		= PHY_HAS_INTERRUPT,
244 	.ack_interrupt	= ip101a_g_ack_interrupt,
245 	.config_init	= &ip101a_g_config_init,
246 	.config_aneg	= &genphy_config_aneg,
247 	.read_status	= &genphy_read_status,
248 	.suspend	= genphy_suspend,
249 	.resume		= genphy_resume,
250 	.driver		= { .owner = THIS_MODULE,},
251 } };
252 
253 module_phy_driver(icplus_driver);
254 
255 static struct mdio_device_id __maybe_unused icplus_tbl[] = {
256 	{ 0x02430d80, 0x0ffffff0 },
257 	{ 0x02430d90, 0x0ffffff0 },
258 	{ 0x02430c54, 0x0ffffff0 },
259 	{ }
260 };
261 
262 MODULE_DEVICE_TABLE(mdio, icplus_tbl);
263