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728de4c9 KP |
1 | /* |
2 | * drivers/net/ucc_geth_mii.c | |
3 | * | |
4e19b5c1 KP |
4 | * QE UCC Gigabit Ethernet Driver -- MII Management Bus Implementation |
5 | * Provides Bus interface for MII Management regs in the UCC register space | |
728de4c9 | 6 | * |
4e19b5c1 | 7 | * Copyright (C) 2007 Freescale Semiconductor, Inc. |
728de4c9 | 8 | * |
4e19b5c1 KP |
9 | * Authors: Li Yang <leoli@freescale.com> |
10 | * Kim Phillips <kim.phillips@freescale.com> | |
728de4c9 KP |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/etherdevice.h> | |
30 | #include <linux/skbuff.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/platform_device.h> | |
728de4c9 KP |
35 | #include <linux/crc32.h> |
36 | #include <linux/mii.h> | |
37 | #include <linux/phy.h> | |
38 | #include <linux/fsl_devices.h> | |
55b6c8e9 | 39 | #include <linux/of_platform.h> |
728de4c9 | 40 | |
728de4c9 KP |
41 | #include <asm/io.h> |
42 | #include <asm/irq.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/ucc.h> | |
45 | ||
46 | #include "ucc_geth_mii.h" | |
47 | #include "ucc_geth.h" | |
48 | ||
49 | #define DEBUG | |
50 | #ifdef DEBUG | |
51 | #define vdbg(format, arg...) printk(KERN_DEBUG , format "\n" , ## arg) | |
52 | #else | |
53 | #define vdbg(format, arg...) do {} while(0) | |
54 | #endif | |
55 | ||
ac421852 LY |
56 | #define MII_DRV_DESC "QE UCC Ethernet Controller MII Bus" |
57 | #define MII_DRV_NAME "fsl-uec_mdio" | |
728de4c9 KP |
58 | |
59 | /* Write value to the PHY for this device to the register at regnum, */ | |
60 | /* waiting until the write is done before it returns. All PHY */ | |
61 | /* configuration has to be done through the master UEC MIIM regs */ | |
62 | int uec_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) | |
63 | { | |
64 | struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv; | |
65 | ||
66 | /* Setting up the MII Mangement Address Register */ | |
67 | out_be32(®s->miimadd, | |
68 | (mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | regnum); | |
69 | ||
70 | /* Setting up the MII Mangement Control Register with the value */ | |
71 | out_be32(®s->miimcon, value); | |
72 | ||
73 | /* Wait till MII management write is complete */ | |
74 | while ((in_be32(®s->miimind)) & MIIMIND_BUSY) | |
75 | cpu_relax(); | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | /* Reads from register regnum in the PHY for device dev, */ | |
81 | /* returning the value. Clears miimcom first. All PHY */ | |
82 | /* configuration has to be done through the TSEC1 MIIM regs */ | |
83 | int uec_mdio_read(struct mii_bus *bus, int mii_id, int regnum) | |
84 | { | |
85 | struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv; | |
86 | u16 value; | |
87 | ||
88 | /* Setting up the MII Mangement Address Register */ | |
89 | out_be32(®s->miimadd, | |
90 | (mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | regnum); | |
91 | ||
92 | /* Clear miimcom, perform an MII management read cycle */ | |
93 | out_be32(®s->miimcom, 0); | |
94 | out_be32(®s->miimcom, MIIMCOM_READ_CYCLE); | |
95 | ||
96 | /* Wait till MII management write is complete */ | |
97 | while ((in_be32(®s->miimind)) & (MIIMIND_BUSY | MIIMIND_NOT_VALID)) | |
98 | cpu_relax(); | |
99 | ||
100 | /* Read MII management status */ | |
101 | value = in_be32(®s->miimstat); | |
102 | ||
103 | return value; | |
104 | } | |
105 | ||
106 | /* Reset the MIIM registers, and wait for the bus to free */ | |
6fee40e9 | 107 | static int uec_mdio_reset(struct mii_bus *bus) |
728de4c9 KP |
108 | { |
109 | struct ucc_mii_mng __iomem *regs = (void __iomem *)bus->priv; | |
110 | unsigned int timeout = PHY_INIT_TIMEOUT; | |
111 | ||
15cf6dde | 112 | mutex_lock(&bus->mdio_lock); |
728de4c9 KP |
113 | |
114 | /* Reset the management interface */ | |
115 | out_be32(®s->miimcfg, MIIMCFG_RESET_MANAGEMENT); | |
116 | ||
117 | /* Setup the MII Mgmt clock speed */ | |
118 | out_be32(®s->miimcfg, MIIMCFG_MANAGEMENT_CLOCK_DIVIDE_BY_112); | |
119 | ||
120 | /* Wait until the bus is free */ | |
121 | while ((in_be32(®s->miimind) & MIIMIND_BUSY) && timeout--) | |
122 | cpu_relax(); | |
123 | ||
15cf6dde | 124 | mutex_unlock(&bus->mdio_lock); |
728de4c9 KP |
125 | |
126 | if (timeout <= 0) { | |
127 | printk(KERN_ERR "%s: The MII Bus is stuck!\n", bus->name); | |
128 | return -EBUSY; | |
129 | } | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
134 | static int uec_mdio_probe(struct of_device *ofdev, const struct of_device_id *match) | |
135 | { | |
136 | struct device *device = &ofdev->dev; | |
137 | struct device_node *np = ofdev->node, *tempnp = NULL; | |
138 | struct device_node *child = NULL; | |
139 | struct ucc_mii_mng __iomem *regs; | |
140 | struct mii_bus *new_bus; | |
141 | struct resource res; | |
142 | int k, err = 0; | |
143 | ||
298cf9be | 144 | new_bus = mdiobus_alloc(); |
728de4c9 KP |
145 | if (NULL == new_bus) |
146 | return -ENOMEM; | |
147 | ||
148 | new_bus->name = "UCC Ethernet Controller MII Bus"; | |
149 | new_bus->read = &uec_mdio_read; | |
150 | new_bus->write = &uec_mdio_write; | |
151 | new_bus->reset = &uec_mdio_reset; | |
152 | ||
153 | memset(&res, 0, sizeof(res)); | |
154 | ||
155 | err = of_address_to_resource(np, 0, &res); | |
156 | if (err) | |
157 | goto reg_map_fail; | |
158 | ||
9d9326d3 | 159 | snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start); |
728de4c9 KP |
160 | |
161 | new_bus->irq = kmalloc(32 * sizeof(int), GFP_KERNEL); | |
162 | ||
163 | if (NULL == new_bus->irq) { | |
164 | err = -ENOMEM; | |
165 | goto reg_map_fail; | |
166 | } | |
167 | ||
168 | for (k = 0; k < 32; k++) | |
169 | new_bus->irq[k] = PHY_POLL; | |
170 | ||
171 | while ((child = of_get_next_child(np, child)) != NULL) { | |
172 | int irq = irq_of_parse_and_map(child, 0); | |
173 | if (irq != NO_IRQ) { | |
40cd3a45 | 174 | const u32 *id = of_get_property(child, "reg", NULL); |
728de4c9 KP |
175 | new_bus->irq[*id] = irq; |
176 | } | |
177 | } | |
178 | ||
179 | /* Set the base address */ | |
180 | regs = ioremap(res.start, sizeof(struct ucc_mii_mng)); | |
181 | ||
182 | if (NULL == regs) { | |
183 | err = -ENOMEM; | |
184 | goto ioremap_fail; | |
185 | } | |
186 | ||
187 | new_bus->priv = (void __force *)regs; | |
188 | ||
18ee49dd | 189 | new_bus->parent = device; |
728de4c9 KP |
190 | dev_set_drvdata(device, new_bus); |
191 | ||
192 | /* Read MII management master from device tree */ | |
193 | while ((tempnp = of_find_compatible_node(tempnp, "network", "ucc_geth")) | |
194 | != NULL) { | |
195 | struct resource tempres; | |
196 | ||
197 | err = of_address_to_resource(tempnp, 0, &tempres); | |
198 | if (err) | |
199 | goto bus_register_fail; | |
200 | ||
201 | /* if our mdio regs fall within this UCC regs range */ | |
202 | if ((res.start >= tempres.start) && | |
203 | (res.end <= tempres.end)) { | |
204 | /* set this UCC to be the MII master */ | |
56626f33 AV |
205 | const u32 *id; |
206 | ||
207 | id = of_get_property(tempnp, "cell-index", NULL); | |
208 | if (!id) { | |
209 | id = of_get_property(tempnp, "device-id", NULL); | |
210 | if (!id) | |
211 | goto bus_register_fail; | |
212 | } | |
728de4c9 KP |
213 | |
214 | ucc_set_qe_mux_mii_mng(*id - 1); | |
215 | ||
216 | /* assign the TBI an address which won't | |
217 | * conflict with the PHYs */ | |
218 | out_be32(®s->utbipar, UTBIPAR_INIT_TBIPA); | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
223 | err = mdiobus_register(new_bus); | |
224 | if (0 != err) { | |
225 | printk(KERN_ERR "%s: Cannot register as MDIO bus\n", | |
226 | new_bus->name); | |
227 | goto bus_register_fail; | |
228 | } | |
229 | ||
230 | return 0; | |
231 | ||
232 | bus_register_fail: | |
233 | iounmap(regs); | |
234 | ioremap_fail: | |
235 | kfree(new_bus->irq); | |
236 | reg_map_fail: | |
298cf9be | 237 | mdiobus_free(new_bus); |
728de4c9 KP |
238 | |
239 | return err; | |
240 | } | |
241 | ||
6fee40e9 | 242 | static int uec_mdio_remove(struct of_device *ofdev) |
728de4c9 KP |
243 | { |
244 | struct device *device = &ofdev->dev; | |
245 | struct mii_bus *bus = dev_get_drvdata(device); | |
246 | ||
247 | mdiobus_unregister(bus); | |
248 | ||
249 | dev_set_drvdata(device, NULL); | |
250 | ||
251 | iounmap((void __iomem *)bus->priv); | |
252 | bus->priv = NULL; | |
298cf9be | 253 | mdiobus_free(bus); |
728de4c9 KP |
254 | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static struct of_device_id uec_mdio_match[] = { | |
259 | { | |
260 | .type = "mdio", | |
261 | .compatible = "ucc_geth_phy", | |
262 | }, | |
d0a2f82d AV |
263 | { |
264 | .compatible = "fsl,ucc-mdio", | |
265 | }, | |
728de4c9 KP |
266 | {}, |
267 | }; | |
268 | ||
728de4c9 | 269 | static struct of_platform_driver uec_mdio_driver = { |
ac421852 | 270 | .name = MII_DRV_NAME, |
728de4c9 KP |
271 | .probe = uec_mdio_probe, |
272 | .remove = uec_mdio_remove, | |
273 | .match_table = uec_mdio_match, | |
274 | }; | |
275 | ||
276 | int __init uec_mdio_init(void) | |
277 | { | |
278 | return of_register_platform_driver(&uec_mdio_driver); | |
279 | } | |
280 | ||
ed7e63a5 DP |
281 | /* called from __init ucc_geth_init, therefore can not be __exit */ |
282 | void uec_mdio_exit(void) | |
728de4c9 KP |
283 | { |
284 | of_unregister_platform_driver(&uec_mdio_driver); | |
285 | } |