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1edb9ca6 SR |
1 | /* 10G controller driver for Samsung SoCs |
2 | * | |
3 | * Copyright (C) 2013 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com | |
5 | * | |
6 | * Author: Siva Reddy Kallam <siva.kallam@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
15 | #include <linux/io.h> | |
16 | #include <linux/mii.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/phy.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/sxgbe_platform.h> | |
22 | ||
23 | #include "sxgbe_common.h" | |
24 | #include "sxgbe_reg.h" | |
25 | ||
26 | #define SXGBE_SMA_WRITE_CMD 0x01 /* write command */ | |
27 | #define SXGBE_SMA_PREAD_CMD 0x02 /* post read increament address */ | |
28 | #define SXGBE_SMA_READ_CMD 0x03 /* read command */ | |
29 | #define SXGBE_SMA_SKIP_ADDRFRM 0x00040000 /* skip the address frame */ | |
7b07bd4e | 30 | #define SXGBE_MII_BUSY 0x00400000 /* mii busy */ |
1edb9ca6 SR |
31 | |
32 | static int sxgbe_mdio_busy_wait(void __iomem *ioaddr, unsigned int mii_data) | |
33 | { | |
34 | unsigned long fin_time = jiffies + 3 * HZ; /* 3 seconds */ | |
35 | ||
36 | while (!time_after(jiffies, fin_time)) { | |
37 | if (!(readl(ioaddr + mii_data) & SXGBE_MII_BUSY)) | |
38 | return 0; | |
39 | cpu_relax(); | |
40 | } | |
41 | ||
42 | return -EBUSY; | |
43 | } | |
44 | ||
45 | static void sxgbe_mdio_ctrl_data(struct sxgbe_priv_data *sp, u32 cmd, | |
46 | u16 phydata) | |
47 | { | |
48 | u32 reg = phydata; | |
49 | ||
50 | reg |= (cmd << 16) | SXGBE_SMA_SKIP_ADDRFRM | | |
51 | ((sp->clk_csr & 0x7) << 19) | SXGBE_MII_BUSY; | |
52 | writel(reg, sp->ioaddr + sp->hw->mii.data); | |
53 | } | |
54 | ||
55 | static void sxgbe_mdio_c45(struct sxgbe_priv_data *sp, u32 cmd, int phyaddr, | |
56 | int phyreg, u16 phydata) | |
57 | { | |
58 | u32 reg; | |
59 | ||
60 | /* set mdio address register */ | |
61 | reg = ((phyreg >> 16) & 0x1f) << 21; | |
62 | reg |= (phyaddr << 16) | (phyreg & 0xffff); | |
63 | writel(reg, sp->ioaddr + sp->hw->mii.addr); | |
64 | ||
65 | sxgbe_mdio_ctrl_data(sp, cmd, phydata); | |
66 | } | |
67 | ||
68 | static void sxgbe_mdio_c22(struct sxgbe_priv_data *sp, u32 cmd, int phyaddr, | |
69 | int phyreg, u16 phydata) | |
70 | { | |
71 | u32 reg; | |
72 | ||
73 | writel(1 << phyaddr, sp->ioaddr + SXGBE_MDIO_CLAUSE22_PORT_REG); | |
74 | ||
75 | /* set mdio address register */ | |
76 | reg = (phyaddr << 16) | (phyreg & 0x1f); | |
77 | writel(reg, sp->ioaddr + sp->hw->mii.addr); | |
78 | ||
79 | sxgbe_mdio_ctrl_data(sp, cmd, phydata); | |
80 | } | |
81 | ||
82 | static int sxgbe_mdio_access(struct sxgbe_priv_data *sp, u32 cmd, int phyaddr, | |
83 | int phyreg, u16 phydata) | |
84 | { | |
85 | const struct mii_regs *mii = &sp->hw->mii; | |
86 | int rc; | |
87 | ||
88 | rc = sxgbe_mdio_busy_wait(sp->ioaddr, mii->data); | |
89 | if (rc < 0) | |
90 | return rc; | |
91 | ||
92 | if (phyreg & MII_ADDR_C45) { | |
93 | sxgbe_mdio_c45(sp, cmd, phyaddr, phyreg, phydata); | |
94 | } else { | |
95 | /* Ports 0-3 only support C22. */ | |
96 | if (phyaddr >= 4) | |
97 | return -ENODEV; | |
98 | ||
99 | sxgbe_mdio_c22(sp, cmd, phyaddr, phyreg, phydata); | |
100 | } | |
101 | ||
102 | return sxgbe_mdio_busy_wait(sp->ioaddr, mii->data); | |
103 | } | |
104 | ||
105 | /** | |
106 | * sxgbe_mdio_read | |
107 | * @bus: points to the mii_bus structure | |
108 | * @phyaddr: address of phy port | |
109 | * @phyreg: address of register with in phy register | |
110 | * Description: this function used for C45 and C22 MDIO Read | |
111 | */ | |
112 | static int sxgbe_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg) | |
113 | { | |
114 | struct net_device *ndev = bus->priv; | |
115 | struct sxgbe_priv_data *priv = netdev_priv(ndev); | |
116 | int rc; | |
117 | ||
118 | rc = sxgbe_mdio_access(priv, SXGBE_SMA_READ_CMD, phyaddr, phyreg, 0); | |
119 | if (rc < 0) | |
120 | return rc; | |
121 | ||
122 | return readl(priv->ioaddr + priv->hw->mii.data) & 0xffff; | |
123 | } | |
124 | ||
125 | /** | |
126 | * sxgbe_mdio_write | |
127 | * @bus: points to the mii_bus structure | |
128 | * @phyaddr: address of phy port | |
129 | * @phyreg: address of phy registers | |
130 | * @phydata: data to be written into phy register | |
131 | * Description: this function is used for C45 and C22 MDIO write | |
132 | */ | |
133 | static int sxgbe_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg, | |
134 | u16 phydata) | |
135 | { | |
136 | struct net_device *ndev = bus->priv; | |
137 | struct sxgbe_priv_data *priv = netdev_priv(ndev); | |
138 | ||
139 | return sxgbe_mdio_access(priv, SXGBE_SMA_WRITE_CMD, phyaddr, phyreg, | |
140 | phydata); | |
141 | } | |
142 | ||
143 | int sxgbe_mdio_register(struct net_device *ndev) | |
144 | { | |
145 | struct mii_bus *mdio_bus; | |
146 | struct sxgbe_priv_data *priv = netdev_priv(ndev); | |
147 | struct sxgbe_mdio_bus_data *mdio_data = priv->plat->mdio_bus_data; | |
148 | int err, phy_addr; | |
149 | int *irqlist; | |
7b07bd4e | 150 | bool phy_found = false; |
1edb9ca6 SR |
151 | bool act; |
152 | ||
153 | /* allocate the new mdio bus */ | |
154 | mdio_bus = mdiobus_alloc(); | |
155 | if (!mdio_bus) { | |
156 | netdev_err(ndev, "%s: mii bus allocation failed\n", __func__); | |
157 | return -ENOMEM; | |
158 | } | |
159 | ||
160 | if (mdio_data->irqs) | |
161 | irqlist = mdio_data->irqs; | |
162 | else | |
163 | irqlist = priv->mii_irq; | |
164 | ||
165 | /* assign mii bus fields */ | |
7b07bd4e | 166 | mdio_bus->name = "sxgbe"; |
1edb9ca6 SR |
167 | mdio_bus->read = &sxgbe_mdio_read; |
168 | mdio_bus->write = &sxgbe_mdio_write; | |
169 | snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-%x", | |
170 | mdio_bus->name, priv->plat->bus_id); | |
171 | mdio_bus->priv = ndev; | |
172 | mdio_bus->phy_mask = mdio_data->phy_mask; | |
173 | mdio_bus->parent = priv->device; | |
174 | ||
175 | /* register with kernel subsystem */ | |
176 | err = mdiobus_register(mdio_bus); | |
177 | if (err != 0) { | |
178 | netdev_err(ndev, "mdiobus register failed\n"); | |
179 | goto mdiobus_err; | |
180 | } | |
181 | ||
182 | for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) { | |
7f854420 | 183 | struct phy_device *phy = mdiobus_get_phy(mdio_bus, phy_addr); |
1edb9ca6 SR |
184 | |
185 | if (phy) { | |
186 | char irq_num[4]; | |
187 | char *irq_str; | |
188 | /* If an IRQ was provided to be assigned after | |
189 | * the bus probe, do it here. | |
190 | */ | |
191 | if ((mdio_data->irqs == NULL) && | |
192 | (mdio_data->probed_phy_irq > 0)) { | |
193 | irqlist[phy_addr] = mdio_data->probed_phy_irq; | |
194 | phy->irq = mdio_data->probed_phy_irq; | |
195 | } | |
196 | ||
197 | /* If we're going to bind the MAC to this PHY bus, | |
198 | * and no PHY number was provided to the MAC, | |
199 | * use the one probed here. | |
200 | */ | |
201 | if (priv->plat->phy_addr == -1) | |
202 | priv->plat->phy_addr = phy_addr; | |
203 | ||
204 | act = (priv->plat->phy_addr == phy_addr); | |
205 | switch (phy->irq) { | |
206 | case PHY_POLL: | |
207 | irq_str = "POLL"; | |
208 | break; | |
209 | case PHY_IGNORE_INTERRUPT: | |
210 | irq_str = "IGNORE"; | |
211 | break; | |
212 | default: | |
213 | sprintf(irq_num, "%d", phy->irq); | |
214 | irq_str = irq_num; | |
215 | break; | |
216 | } | |
217 | netdev_info(ndev, "PHY ID %08x at %d IRQ %s (%s)%s\n", | |
218 | phy->phy_id, phy_addr, irq_str, | |
84eff6d1 | 219 | phydev_name(phy), act ? " active" : ""); |
7b07bd4e | 220 | phy_found = true; |
1edb9ca6 SR |
221 | } |
222 | } | |
223 | ||
7b07bd4e BA |
224 | if (!phy_found) { |
225 | netdev_err(ndev, "PHY not found\n"); | |
226 | goto phyfound_err; | |
227 | } | |
228 | ||
1edb9ca6 SR |
229 | priv->mii = mdio_bus; |
230 | ||
231 | return 0; | |
232 | ||
7b07bd4e BA |
233 | phyfound_err: |
234 | err = -ENODEV; | |
235 | mdiobus_unregister(mdio_bus); | |
1edb9ca6 SR |
236 | mdiobus_err: |
237 | mdiobus_free(mdio_bus); | |
238 | return err; | |
239 | } | |
240 | ||
241 | int sxgbe_mdio_unregister(struct net_device *ndev) | |
242 | { | |
243 | struct sxgbe_priv_data *priv = netdev_priv(ndev); | |
244 | ||
245 | if (!priv->mii) | |
246 | return 0; | |
247 | ||
248 | mdiobus_unregister(priv->mii); | |
249 | priv->mii->priv = NULL; | |
250 | mdiobus_free(priv->mii); | |
251 | priv->mii = NULL; | |
252 | ||
253 | return 0; | |
254 | } |