Commit | Line | Data |
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11b0bacd | 1 | /* |
a79d8e93 | 2 | * Fixed MDIO bus (MDIO bus emulation with fixed PHYs) |
11b0bacd | 3 | * |
a79d8e93 VB |
4 | * Author: Vitaly Bordug <vbordug@ru.mvista.com> |
5 | * Anton Vorontsov <avorontsov@ru.mvista.com> | |
11b0bacd | 6 | * |
a79d8e93 | 7 | * Copyright (c) 2006-2007 MontaVista Software, Inc. |
11b0bacd VB |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
11b0bacd | 13 | */ |
a79d8e93 | 14 | |
11b0bacd | 15 | #include <linux/kernel.h> |
11b0bacd | 16 | #include <linux/module.h> |
a79d8e93 VB |
17 | #include <linux/platform_device.h> |
18 | #include <linux/list.h> | |
11b0bacd | 19 | #include <linux/mii.h> |
11b0bacd | 20 | #include <linux/phy.h> |
7c32f470 | 21 | #include <linux/phy_fixed.h> |
57401d5e | 22 | #include <linux/err.h> |
11b0bacd | 23 | |
a79d8e93 | 24 | #define MII_REGS_NUM 29 |
11b0bacd | 25 | |
a79d8e93 VB |
26 | struct fixed_mdio_bus { |
27 | int irqs[PHY_MAX_ADDR]; | |
298cf9be | 28 | struct mii_bus *mii_bus; |
a79d8e93 VB |
29 | struct list_head phys; |
30 | }; | |
11b0bacd | 31 | |
a79d8e93 VB |
32 | struct fixed_phy { |
33 | int id; | |
34 | u16 regs[MII_REGS_NUM]; | |
35 | struct phy_device *phydev; | |
36 | struct fixed_phy_status status; | |
37 | int (*link_update)(struct net_device *, struct fixed_phy_status *); | |
38 | struct list_head node; | |
39 | }; | |
7c32f470 | 40 | |
a79d8e93 VB |
41 | static struct platform_device *pdev; |
42 | static struct fixed_mdio_bus platform_fmb = { | |
43 | .phys = LIST_HEAD_INIT(platform_fmb.phys), | |
44 | }; | |
7c32f470 | 45 | |
a79d8e93 | 46 | static int fixed_phy_update_regs(struct fixed_phy *fp) |
11b0bacd | 47 | { |
a79d8e93 | 48 | u16 bmsr = BMSR_ANEGCAPABLE; |
11b0bacd | 49 | u16 bmcr = 0; |
a79d8e93 VB |
50 | u16 lpagb = 0; |
51 | u16 lpa = 0; | |
11b0bacd | 52 | |
a79d8e93 | 53 | if (fp->status.duplex) { |
11b0bacd VB |
54 | bmcr |= BMCR_FULLDPLX; |
55 | ||
a79d8e93 VB |
56 | switch (fp->status.speed) { |
57 | case 1000: | |
58 | bmsr |= BMSR_ESTATEN; | |
59 | bmcr |= BMCR_SPEED1000; | |
60 | lpagb |= LPA_1000FULL; | |
61 | break; | |
11b0bacd VB |
62 | case 100: |
63 | bmsr |= BMSR_100FULL; | |
64 | bmcr |= BMCR_SPEED100; | |
a79d8e93 | 65 | lpa |= LPA_100FULL; |
7c32f470 | 66 | break; |
11b0bacd VB |
67 | case 10: |
68 | bmsr |= BMSR_10FULL; | |
a79d8e93 | 69 | lpa |= LPA_10FULL; |
7c32f470 | 70 | break; |
a79d8e93 VB |
71 | default: |
72 | printk(KERN_WARNING "fixed phy: unknown speed\n"); | |
73 | return -EINVAL; | |
11b0bacd VB |
74 | } |
75 | } else { | |
a79d8e93 VB |
76 | switch (fp->status.speed) { |
77 | case 1000: | |
78 | bmsr |= BMSR_ESTATEN; | |
79 | bmcr |= BMCR_SPEED1000; | |
80 | lpagb |= LPA_1000HALF; | |
81 | break; | |
11b0bacd VB |
82 | case 100: |
83 | bmsr |= BMSR_100HALF; | |
84 | bmcr |= BMCR_SPEED100; | |
a79d8e93 | 85 | lpa |= LPA_100HALF; |
7c32f470 | 86 | break; |
11b0bacd | 87 | case 10: |
a79d8e93 VB |
88 | bmsr |= BMSR_10HALF; |
89 | lpa |= LPA_10HALF; | |
7c32f470 | 90 | break; |
a79d8e93 VB |
91 | default: |
92 | printk(KERN_WARNING "fixed phy: unknown speed\n"); | |
93 | return -EINVAL; | |
11b0bacd VB |
94 | } |
95 | } | |
96 | ||
a79d8e93 VB |
97 | if (fp->status.link) |
98 | bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE; | |
99 | ||
100 | if (fp->status.pause) | |
101 | lpa |= LPA_PAUSE_CAP; | |
102 | ||
103 | if (fp->status.asym_pause) | |
104 | lpa |= LPA_PAUSE_ASYM; | |
105 | ||
106 | fp->regs[MII_PHYSID1] = fp->id >> 16; | |
107 | fp->regs[MII_PHYSID2] = fp->id; | |
108 | ||
109 | fp->regs[MII_BMSR] = bmsr; | |
110 | fp->regs[MII_BMCR] = bmcr; | |
111 | fp->regs[MII_LPA] = lpa; | |
112 | fp->regs[MII_STAT1000] = lpagb; | |
11b0bacd VB |
113 | |
114 | return 0; | |
115 | } | |
116 | ||
a79d8e93 | 117 | static int fixed_mdio_read(struct mii_bus *bus, int phy_id, int reg_num) |
11b0bacd | 118 | { |
ec2a5652 | 119 | struct fixed_mdio_bus *fmb = bus->priv; |
a79d8e93 VB |
120 | struct fixed_phy *fp; |
121 | ||
122 | if (reg_num >= MII_REGS_NUM) | |
123 | return -1; | |
124 | ||
125 | list_for_each_entry(fp, &fmb->phys, node) { | |
126 | if (fp->id == phy_id) { | |
127 | /* Issue callback if user registered it. */ | |
128 | if (fp->link_update) { | |
129 | fp->link_update(fp->phydev->attached_dev, | |
130 | &fp->status); | |
131 | fixed_phy_update_regs(fp); | |
11b0bacd | 132 | } |
a79d8e93 | 133 | return fp->regs[reg_num]; |
7c32f470 | 134 | } |
a79d8e93 | 135 | } |
11b0bacd | 136 | |
a79d8e93 | 137 | return 0xFFFF; |
11b0bacd VB |
138 | } |
139 | ||
a79d8e93 VB |
140 | static int fixed_mdio_write(struct mii_bus *bus, int phy_id, int reg_num, |
141 | u16 val) | |
11b0bacd | 142 | { |
11b0bacd VB |
143 | return 0; |
144 | } | |
145 | ||
a79d8e93 VB |
146 | /* |
147 | * If something weird is required to be done with link/speed, | |
148 | * network driver is able to assign a function to implement this. | |
149 | * May be useful for PHY's that need to be software-driven. | |
150 | */ | |
151 | int fixed_phy_set_link_update(struct phy_device *phydev, | |
152 | int (*link_update)(struct net_device *, | |
153 | struct fixed_phy_status *)) | |
11b0bacd | 154 | { |
a79d8e93 VB |
155 | struct fixed_mdio_bus *fmb = &platform_fmb; |
156 | struct fixed_phy *fp; | |
11b0bacd | 157 | |
a79d8e93 VB |
158 | if (!link_update || !phydev || !phydev->bus) |
159 | return -EINVAL; | |
11b0bacd | 160 | |
a79d8e93 VB |
161 | list_for_each_entry(fp, &fmb->phys, node) { |
162 | if (fp->id == phydev->phy_id) { | |
163 | fp->link_update = link_update; | |
164 | fp->phydev = phydev; | |
165 | return 0; | |
166 | } | |
167 | } | |
11b0bacd | 168 | |
a79d8e93 | 169 | return -ENOENT; |
7c32f470 | 170 | } |
a79d8e93 | 171 | EXPORT_SYMBOL_GPL(fixed_phy_set_link_update); |
7c32f470 | 172 | |
a79d8e93 VB |
173 | int fixed_phy_add(unsigned int irq, int phy_id, |
174 | struct fixed_phy_status *status) | |
11b0bacd | 175 | { |
a79d8e93 VB |
176 | int ret; |
177 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
178 | struct fixed_phy *fp; | |
11b0bacd | 179 | |
a79d8e93 VB |
180 | fp = kzalloc(sizeof(*fp), GFP_KERNEL); |
181 | if (!fp) | |
182 | return -ENOMEM; | |
11b0bacd | 183 | |
a79d8e93 | 184 | memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM); |
11b0bacd | 185 | |
a79d8e93 | 186 | fmb->irqs[phy_id] = irq; |
11b0bacd | 187 | |
a79d8e93 VB |
188 | fp->id = phy_id; |
189 | fp->status = *status; | |
7c32f470 | 190 | |
a79d8e93 VB |
191 | ret = fixed_phy_update_regs(fp); |
192 | if (ret) | |
193 | goto err_regs; | |
11b0bacd | 194 | |
a79d8e93 | 195 | list_add_tail(&fp->node, &fmb->phys); |
7c32f470 | 196 | |
a79d8e93 | 197 | return 0; |
11b0bacd | 198 | |
a79d8e93 VB |
199 | err_regs: |
200 | kfree(fp); | |
201 | return ret; | |
202 | } | |
203 | EXPORT_SYMBOL_GPL(fixed_phy_add); | |
11b0bacd | 204 | |
a79d8e93 VB |
205 | static int __init fixed_mdio_bus_init(void) |
206 | { | |
207 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
208 | int ret; | |
11b0bacd | 209 | |
a79d8e93 | 210 | pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0); |
57401d5e DC |
211 | if (IS_ERR(pdev)) { |
212 | ret = PTR_ERR(pdev); | |
a79d8e93 VB |
213 | goto err_pdev; |
214 | } | |
11b0bacd | 215 | |
298cf9be LB |
216 | fmb->mii_bus = mdiobus_alloc(); |
217 | if (fmb->mii_bus == NULL) { | |
218 | ret = -ENOMEM; | |
219 | goto err_mdiobus_reg; | |
220 | } | |
11b0bacd | 221 | |
298cf9be LB |
222 | snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "0"); |
223 | fmb->mii_bus->name = "Fixed MDIO Bus"; | |
ec2a5652 | 224 | fmb->mii_bus->priv = fmb; |
298cf9be LB |
225 | fmb->mii_bus->parent = &pdev->dev; |
226 | fmb->mii_bus->read = &fixed_mdio_read; | |
227 | fmb->mii_bus->write = &fixed_mdio_write; | |
228 | fmb->mii_bus->irq = fmb->irqs; | |
229 | ||
230 | ret = mdiobus_register(fmb->mii_bus); | |
a79d8e93 | 231 | if (ret) |
298cf9be | 232 | goto err_mdiobus_alloc; |
11b0bacd | 233 | |
a79d8e93 | 234 | return 0; |
11b0bacd | 235 | |
298cf9be LB |
236 | err_mdiobus_alloc: |
237 | mdiobus_free(fmb->mii_bus); | |
a79d8e93 VB |
238 | err_mdiobus_reg: |
239 | platform_device_unregister(pdev); | |
240 | err_pdev: | |
241 | return ret; | |
242 | } | |
243 | module_init(fixed_mdio_bus_init); | |
11b0bacd | 244 | |
a79d8e93 VB |
245 | static void __exit fixed_mdio_bus_exit(void) |
246 | { | |
247 | struct fixed_mdio_bus *fmb = &platform_fmb; | |
651be3a2 | 248 | struct fixed_phy *fp, *tmp; |
11b0bacd | 249 | |
298cf9be LB |
250 | mdiobus_unregister(fmb->mii_bus); |
251 | mdiobus_free(fmb->mii_bus); | |
a79d8e93 | 252 | platform_device_unregister(pdev); |
11b0bacd | 253 | |
651be3a2 | 254 | list_for_each_entry_safe(fp, tmp, &fmb->phys, node) { |
a79d8e93 VB |
255 | list_del(&fp->node); |
256 | kfree(fp); | |
7c32f470 | 257 | } |
11b0bacd | 258 | } |
a79d8e93 | 259 | module_exit(fixed_mdio_bus_exit); |
11b0bacd | 260 | |
a79d8e93 | 261 | MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"); |
11b0bacd VB |
262 | MODULE_AUTHOR("Vitaly Bordug"); |
263 | MODULE_LICENSE("GPL"); |