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27#include <linux/mii.h>
28#include <linux/phy.h>
29#include <linux/slab.h>
30#include <linux/of.h>
31#include <linux/of_gpio.h>
32
33#include <asm/io.h>
34
35#include "stmmac.h"
36
37#define MII_BUSY 0x00000001
38#define MII_WRITE 0x00000002
39
40static int stmmac_mdio_busy_wait(void __iomem *ioaddr, unsigned int mii_addr)
41{
42 unsigned long curr;
43 unsigned long finish = jiffies + 3 * HZ;
44
45 do {
46 curr = jiffies;
47 if (readl(ioaddr + mii_addr) & MII_BUSY)
48 cpu_relax();
49 else
50 return 0;
51 } while (!time_after_eq(curr, finish));
52
53 return -EBUSY;
54}
55
56
57
58
59
60
61
62
63
64
65
66static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
67{
68 struct net_device *ndev = bus->priv;
69 struct stmmac_priv *priv = netdev_priv(ndev);
70 unsigned int mii_address = priv->hw->mii.addr;
71 unsigned int mii_data = priv->hw->mii.data;
72
73 int data;
74 u16 regValue = (((phyaddr << 11) & (0x0000F800)) |
75 ((phyreg << 6) & (0x000007C0)));
76 regValue |= MII_BUSY | ((priv->clk_csr & 0xF) << 2);
77
78 if (stmmac_mdio_busy_wait(priv->ioaddr, mii_address))
79 return -EBUSY;
80
81 writel(regValue, priv->ioaddr + mii_address);
82
83 if (stmmac_mdio_busy_wait(priv->ioaddr, mii_address))
84 return -EBUSY;
85
86
87 data = (int)readl(priv->ioaddr + mii_data);
88
89 return data;
90}
91
92
93
94
95
96
97
98
99
100static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
101 u16 phydata)
102{
103 struct net_device *ndev = bus->priv;
104 struct stmmac_priv *priv = netdev_priv(ndev);
105 unsigned int mii_address = priv->hw->mii.addr;
106 unsigned int mii_data = priv->hw->mii.data;
107
108 u16 value =
109 (((phyaddr << 11) & (0x0000F800)) | ((phyreg << 6) & (0x000007C0)))
110 | MII_WRITE;
111
112 value |= MII_BUSY | ((priv->clk_csr & 0xF) << 2);
113
114
115 if (stmmac_mdio_busy_wait(priv->ioaddr, mii_address))
116 return -EBUSY;
117
118
119 writel(phydata, priv->ioaddr + mii_data);
120 writel(value, priv->ioaddr + mii_address);
121
122
123 return stmmac_mdio_busy_wait(priv->ioaddr, mii_address);
124}
125
126
127
128
129
130
131int stmmac_mdio_reset(struct mii_bus *bus)
132{
133#if defined(CONFIG_STMMAC_PLATFORM)
134 struct net_device *ndev = bus->priv;
135 struct stmmac_priv *priv = netdev_priv(ndev);
136 unsigned int mii_address = priv->hw->mii.addr;
137 struct stmmac_mdio_bus_data *data = priv->plat->mdio_bus_data;
138
139#ifdef CONFIG_OF
140 if (priv->device->of_node) {
141 int reset_gpio, active_low;
142
143 if (data->reset_gpio < 0) {
144 struct device_node *np = priv->device->of_node;
145 if (!np)
146 return 0;
147
148 data->reset_gpio = of_get_named_gpio(np,
149 "snps,reset-gpio", 0);
150 if (data->reset_gpio < 0)
151 return 0;
152
153 data->active_low = of_property_read_bool(np,
154 "snps,reset-active-low");
155 of_property_read_u32_array(np,
156 "snps,reset-delays-us", data->delays, 3);
157 }
158
159 reset_gpio = data->reset_gpio;
160 active_low = data->active_low;
161
162 if (!gpio_request(reset_gpio, "mdio-reset")) {
163 gpio_direction_output(reset_gpio, active_low ? 1 : 0);
164 udelay(data->delays[0]);
165 gpio_set_value(reset_gpio, active_low ? 0 : 1);
166 udelay(data->delays[1]);
167 gpio_set_value(reset_gpio, active_low ? 1 : 0);
168 udelay(data->delays[2]);
169 }
170 }
171#endif
172
173 if (data->phy_reset) {
174 pr_debug("stmmac_mdio_reset: calling phy_reset\n");
175 data->phy_reset(priv->plat->bsp_priv);
176 }
177
178
179
180
181
182 writel(0, priv->ioaddr + mii_address);
183#endif
184 return 0;
185}
186
187
188
189
190
191
192int stmmac_mdio_register(struct net_device *ndev)
193{
194 int err = 0;
195 struct mii_bus *new_bus;
196 int *irqlist;
197 struct stmmac_priv *priv = netdev_priv(ndev);
198 struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
199 int addr, found;
200
201 if (!mdio_bus_data)
202 return 0;
203
204 new_bus = mdiobus_alloc();
205 if (new_bus == NULL)
206 return -ENOMEM;
207
208 if (mdio_bus_data->irqs) {
209 irqlist = mdio_bus_data->irqs;
210 } else {
211 for (addr = 0; addr < PHY_MAX_ADDR; addr++)
212 priv->mii_irq[addr] = PHY_POLL;
213 irqlist = priv->mii_irq;
214 }
215
216#ifdef CONFIG_OF
217 if (priv->device->of_node)
218 mdio_bus_data->reset_gpio = -1;
219#endif
220
221 new_bus->name = "stmmac";
222 new_bus->read = &stmmac_mdio_read;
223 new_bus->write = &stmmac_mdio_write;
224 new_bus->reset = &stmmac_mdio_reset;
225 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s-%x",
226 new_bus->name, priv->plat->bus_id);
227 new_bus->priv = ndev;
228 new_bus->irq = irqlist;
229 new_bus->phy_mask = mdio_bus_data->phy_mask;
230 new_bus->parent = priv->device;
231 err = mdiobus_register(new_bus);
232 if (err != 0) {
233 pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
234 goto bus_register_fail;
235 }
236
237 found = 0;
238 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
239 struct phy_device *phydev = new_bus->phy_map[addr];
240 if (phydev) {
241 int act = 0;
242 char irq_num[4];
243 char *irq_str;
244
245
246
247
248
249 if ((mdio_bus_data->irqs == NULL) &&
250 (mdio_bus_data->probed_phy_irq > 0)) {
251 irqlist[addr] = mdio_bus_data->probed_phy_irq;
252 phydev->irq = mdio_bus_data->probed_phy_irq;
253 }
254
255
256
257
258
259
260 if (priv->plat->phy_addr == -1)
261 priv->plat->phy_addr = addr;
262
263 act = (priv->plat->phy_addr == addr);
264 switch (phydev->irq) {
265 case PHY_POLL:
266 irq_str = "POLL";
267 break;
268 case PHY_IGNORE_INTERRUPT:
269 irq_str = "IGNORE";
270 break;
271 default:
272 sprintf(irq_num, "%d", phydev->irq);
273 irq_str = irq_num;
274 break;
275 }
276 pr_info("%s: PHY ID %08x at %d IRQ %s (%s)%s\n",
277 ndev->name, phydev->phy_id, addr,
278 irq_str, dev_name(&phydev->dev),
279 act ? " active" : "");
280 found = 1;
281 }
282 }
283
284 if (!found) {
285 pr_warning("%s: No PHY found\n", ndev->name);
286 mdiobus_unregister(new_bus);
287 mdiobus_free(new_bus);
288 return -ENODEV;
289 }
290
291 priv->mii = new_bus;
292
293 return 0;
294
295bus_register_fail:
296 mdiobus_free(new_bus);
297 return err;
298}
299
300
301
302
303
304
305int stmmac_mdio_unregister(struct net_device *ndev)
306{
307 struct stmmac_priv *priv = netdev_priv(ndev);
308
309 if (!priv->mii)
310 return 0;
311
312 mdiobus_unregister(priv->mii);
313 priv->mii->priv = NULL;
314 mdiobus_free(priv->mii);
315 priv->mii = NULL;
316
317 return 0;
318}
319