Commit | Line | Data |
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48257c4f PA |
1 | /* |
2 | * Combined Ethernet driver for Motorola MPC8xx and MPC82xx. | |
3 | * | |
9b8ee8e7 | 4 | * Copyright (c) 2003 Intracom S.A. |
48257c4f | 5 | * by Pantelis Antoniou <panto@intracom.gr> |
9b8ee8e7 VB |
6 | * |
7 | * 2005 (c) MontaVista Software, Inc. | |
48257c4f PA |
8 | * Vitaly Bordug <vbordug@ru.mvista.com> |
9 | * | |
9b8ee8e7 VB |
10 | * This file is licensed under the terms of the GNU General Public License |
11 | * version 2. This program is licensed "as is" without any warranty of any | |
48257c4f PA |
12 | * kind, whether express or implied. |
13 | */ | |
14 | ||
48257c4f | 15 | #include <linux/module.h> |
48257c4f PA |
16 | #include <linux/ioport.h> |
17 | #include <linux/slab.h> | |
48257c4f | 18 | #include <linux/init.h> |
2b5b3a60 | 19 | #include <linux/interrupt.h> |
48257c4f PA |
20 | #include <linux/netdevice.h> |
21 | #include <linux/etherdevice.h> | |
48257c4f | 22 | #include <linux/mii.h> |
5b4b8454 | 23 | #include <linux/platform_device.h> |
2b5b3a60 | 24 | #include <linux/mdio-bitbang.h> |
976de6a8 | 25 | #include <linux/of_platform.h> |
48257c4f PA |
26 | |
27 | #include "fs_enet.h" | |
28 | ||
976de6a8 | 29 | struct bb_info { |
2b5b3a60 | 30 | struct mdiobb_ctrl ctrl; |
976de6a8 SW |
31 | __be32 __iomem *dir; |
32 | __be32 __iomem *dat; | |
33 | u32 mdio_msk; | |
34 | u32 mdc_msk; | |
976de6a8 SW |
35 | }; |
36 | ||
37 | /* FIXME: If any other users of GPIO crop up, then these will have to | |
38 | * have some sort of global synchronization to avoid races with other | |
39 | * pins on the same port. The ideal solution would probably be to | |
40 | * bind the ports to a GPIO driver, and have this be a client of it. | |
41 | */ | |
42 | static inline void bb_set(u32 __iomem *p, u32 m) | |
48257c4f | 43 | { |
976de6a8 | 44 | out_be32(p, in_be32(p) | m); |
48257c4f PA |
45 | } |
46 | ||
976de6a8 | 47 | static inline void bb_clr(u32 __iomem *p, u32 m) |
48257c4f | 48 | { |
976de6a8 | 49 | out_be32(p, in_be32(p) & ~m); |
48257c4f PA |
50 | } |
51 | ||
976de6a8 | 52 | static inline int bb_read(u32 __iomem *p, u32 m) |
48257c4f | 53 | { |
976de6a8 | 54 | return (in_be32(p) & m) != 0; |
48257c4f PA |
55 | } |
56 | ||
2b5b3a60 | 57 | static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir) |
48257c4f | 58 | { |
2b5b3a60 | 59 | struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); |
48257c4f | 60 | |
2b5b3a60 SW |
61 | if (dir) |
62 | bb_set(bitbang->dir, bitbang->mdio_msk); | |
63 | else | |
64 | bb_clr(bitbang->dir, bitbang->mdio_msk); | |
65 | ||
66 | /* Read back to flush the write. */ | |
67 | in_be32(bitbang->dir); | |
48257c4f PA |
68 | } |
69 | ||
2b5b3a60 | 70 | static inline int mdio_read(struct mdiobb_ctrl *ctrl) |
48257c4f | 71 | { |
2b5b3a60 | 72 | struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); |
976de6a8 | 73 | return bb_read(bitbang->dat, bitbang->mdio_msk); |
48257c4f PA |
74 | } |
75 | ||
2b5b3a60 | 76 | static inline void mdio(struct mdiobb_ctrl *ctrl, int what) |
48257c4f | 77 | { |
2b5b3a60 SW |
78 | struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); |
79 | ||
48257c4f | 80 | if (what) |
976de6a8 | 81 | bb_set(bitbang->dat, bitbang->mdio_msk); |
48257c4f | 82 | else |
976de6a8 | 83 | bb_clr(bitbang->dat, bitbang->mdio_msk); |
2b5b3a60 SW |
84 | |
85 | /* Read back to flush the write. */ | |
86 | in_be32(bitbang->dat); | |
48257c4f PA |
87 | } |
88 | ||
2b5b3a60 | 89 | static inline void mdc(struct mdiobb_ctrl *ctrl, int what) |
48257c4f | 90 | { |
2b5b3a60 SW |
91 | struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); |
92 | ||
48257c4f | 93 | if (what) |
976de6a8 | 94 | bb_set(bitbang->dat, bitbang->mdc_msk); |
48257c4f | 95 | else |
976de6a8 | 96 | bb_clr(bitbang->dat, bitbang->mdc_msk); |
48257c4f | 97 | |
2b5b3a60 SW |
98 | /* Read back to flush the write. */ |
99 | in_be32(bitbang->dat); | |
48257c4f PA |
100 | } |
101 | ||
2b5b3a60 SW |
102 | static struct mdiobb_ops bb_ops = { |
103 | .owner = THIS_MODULE, | |
104 | .set_mdc = mdc, | |
105 | .set_mdio_dir = mdio_dir, | |
106 | .set_mdio_data = mdio, | |
107 | .get_mdio_data = mdio_read, | |
108 | }; | |
5b4b8454 | 109 | |
976de6a8 SW |
110 | static int __devinit fs_mii_bitbang_init(struct mii_bus *bus, |
111 | struct device_node *np) | |
48257c4f | 112 | { |
976de6a8 SW |
113 | struct resource res; |
114 | const u32 *data; | |
115 | int mdio_pin, mdc_pin, len; | |
116 | struct bb_info *bitbang = bus->priv; | |
48257c4f | 117 | |
976de6a8 SW |
118 | int ret = of_address_to_resource(np, 0, &res); |
119 | if (ret) | |
120 | return ret; | |
121 | ||
122 | if (res.end - res.start < 13) | |
123 | return -ENODEV; | |
124 | ||
125 | /* This should really encode the pin number as well, but all | |
126 | * we get is an int, and the odds of multiple bitbang mdio buses | |
127 | * is low enough that it's not worth going too crazy. | |
128 | */ | |
9d9326d3 | 129 | snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); |
976de6a8 SW |
130 | |
131 | data = of_get_property(np, "fsl,mdio-pin", &len); | |
132 | if (!data || len != 4) | |
133 | return -ENODEV; | |
134 | mdio_pin = *data; | |
135 | ||
136 | data = of_get_property(np, "fsl,mdc-pin", &len); | |
137 | if (!data || len != 4) | |
138 | return -ENODEV; | |
139 | mdc_pin = *data; | |
140 | ||
141 | bitbang->dir = ioremap(res.start, res.end - res.start + 1); | |
142 | if (!bitbang->dir) | |
143 | return -ENOMEM; | |
144 | ||
145 | bitbang->dat = bitbang->dir + 4; | |
146 | bitbang->mdio_msk = 1 << (31 - mdio_pin); | |
147 | bitbang->mdc_msk = 1 << (31 - mdc_pin); | |
976de6a8 SW |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static void __devinit add_phy(struct mii_bus *bus, struct device_node *np) | |
153 | { | |
154 | const u32 *data; | |
155 | int len, id, irq; | |
156 | ||
157 | data = of_get_property(np, "reg", &len); | |
158 | if (!data || len != 4) | |
159 | return; | |
160 | ||
161 | id = *data; | |
162 | bus->phy_mask &= ~(1 << id); | |
5b4b8454 | 163 | |
976de6a8 SW |
164 | irq = of_irq_to_resource(np, 0, NULL); |
165 | if (irq != NO_IRQ) | |
166 | bus->irq[id] = irq; | |
167 | } | |
168 | ||
169 | static int __devinit fs_enet_mdio_probe(struct of_device *ofdev, | |
170 | const struct of_device_id *match) | |
171 | { | |
172 | struct device_node *np = NULL; | |
173 | struct mii_bus *new_bus; | |
174 | struct bb_info *bitbang; | |
175 | int ret = -ENOMEM; | |
176 | int i; | |
177 | ||
976de6a8 SW |
178 | bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL); |
179 | if (!bitbang) | |
2b5b3a60 SW |
180 | goto out; |
181 | ||
182 | bitbang->ctrl.ops = &bb_ops; | |
183 | ||
184 | new_bus = alloc_mdio_bitbang(&bitbang->ctrl); | |
185 | if (!new_bus) | |
186 | goto out_free_priv; | |
976de6a8 | 187 | |
976de6a8 | 188 | new_bus->name = "CPM2 Bitbanged MII", |
976de6a8 SW |
189 | |
190 | ret = fs_mii_bitbang_init(new_bus, ofdev->node); | |
191 | if (ret) | |
2b5b3a60 | 192 | goto out_free_bus; |
976de6a8 SW |
193 | |
194 | new_bus->phy_mask = ~0; | |
195 | new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); | |
196 | if (!new_bus->irq) | |
197 | goto out_unmap_regs; | |
198 | ||
199 | for (i = 0; i < PHY_MAX_ADDR; i++) | |
200 | new_bus->irq[i] = -1; | |
201 | ||
202 | while ((np = of_get_next_child(ofdev->node, np))) | |
203 | if (!strcmp(np->type, "ethernet-phy")) | |
204 | add_phy(new_bus, np); | |
205 | ||
18ee49dd | 206 | new_bus->parent = &ofdev->dev; |
976de6a8 SW |
207 | dev_set_drvdata(&ofdev->dev, new_bus); |
208 | ||
209 | ret = mdiobus_register(new_bus); | |
210 | if (ret) | |
211 | goto out_free_irqs; | |
212 | ||
213 | return 0; | |
214 | ||
215 | out_free_irqs: | |
216 | dev_set_drvdata(&ofdev->dev, NULL); | |
217 | kfree(new_bus->irq); | |
218 | out_unmap_regs: | |
219 | iounmap(bitbang->dir); | |
976de6a8 | 220 | out_free_bus: |
2b5b3a60 | 221 | free_mdio_bitbang(new_bus); |
298cf9be LB |
222 | out_free_priv: |
223 | kfree(bitbang); | |
976de6a8 SW |
224 | out: |
225 | return ret; | |
226 | } | |
227 | ||
228 | static int fs_enet_mdio_remove(struct of_device *ofdev) | |
229 | { | |
230 | struct mii_bus *bus = dev_get_drvdata(&ofdev->dev); | |
231 | struct bb_info *bitbang = bus->priv; | |
232 | ||
233 | mdiobus_unregister(bus); | |
234 | dev_set_drvdata(&ofdev->dev, NULL); | |
235 | kfree(bus->irq); | |
298cf9be | 236 | free_mdio_bitbang(bus); |
976de6a8 SW |
237 | iounmap(bitbang->dir); |
238 | kfree(bitbang); | |
976de6a8 SW |
239 | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static struct of_device_id fs_enet_mdio_bb_match[] = { | |
244 | { | |
245 | .compatible = "fsl,cpm2-mdio-bitbang", | |
246 | }, | |
247 | {}, | |
248 | }; | |
249 | ||
250 | static struct of_platform_driver fs_enet_bb_mdio_driver = { | |
251 | .name = "fsl-bb-mdio", | |
252 | .match_table = fs_enet_mdio_bb_match, | |
253 | .probe = fs_enet_mdio_probe, | |
254 | .remove = fs_enet_mdio_remove, | |
255 | }; | |
256 | ||
2b5b3a60 | 257 | static int fs_enet_mdio_bb_init(void) |
976de6a8 SW |
258 | { |
259 | return of_register_platform_driver(&fs_enet_bb_mdio_driver); | |
260 | } | |
261 | ||
2b5b3a60 | 262 | static void fs_enet_mdio_bb_exit(void) |
976de6a8 SW |
263 | { |
264 | of_unregister_platform_driver(&fs_enet_bb_mdio_driver); | |
265 | } | |
266 | ||
267 | module_init(fs_enet_mdio_bb_init); | |
268 | module_exit(fs_enet_mdio_bb_exit); |