tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2009,2011 Cavium, Inc.
7 */
8
9#include <linux/platform_device.h>
10#include <linux/of_mdio.h>
11#include <linux/delay.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/gfp.h>
15#include <linux/phy.h>
16#include <linux/io.h>
17
18#include <asm/octeon/octeon.h>
19#include <asm/octeon/cvmx-smix-defs.h>
20
21#define DRV_VERSION "1.0"
22#define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
23
24#define SMI_CMD 0x0
25#define SMI_WR_DAT 0x8
26#define SMI_RD_DAT 0x10
27#define SMI_CLK 0x18
28#define SMI_EN 0x20
29
30struct octeon_mdiobus {
31 struct mii_bus *mii_bus;
32 u64 register_base;
33 resource_size_t mdio_phys;
34 resource_size_t regsize;
35 int phy_irq[PHY_MAX_ADDR];
36};
37
38static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
39{
40 struct octeon_mdiobus *p = bus->priv;
41 union cvmx_smix_cmd smi_cmd;
42 union cvmx_smix_rd_dat smi_rd;
43 int timeout = 1000;
44
45 smi_cmd.u64 = 0;
46 smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */
47 smi_cmd.s.phy_adr = phy_id;
48 smi_cmd.s.reg_adr = regnum;
49 cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
50
51 do {
52 /*
53 * Wait 1000 clocks so we don't saturate the RSL bus
54 * doing reads.
55 */
56 __delay(1000);
57 smi_rd.u64 = cvmx_read_csr(p->register_base + SMI_RD_DAT);
58 } while (smi_rd.s.pending && --timeout);
59
60 if (smi_rd.s.val)
61 return smi_rd.s.dat;
62 else
63 return -EIO;
64}
65
66static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
67 int regnum, u16 val)
68{
69 struct octeon_mdiobus *p = bus->priv;
70 union cvmx_smix_cmd smi_cmd;
71 union cvmx_smix_wr_dat smi_wr;
72 int timeout = 1000;
73
74 smi_wr.u64 = 0;
75 smi_wr.s.dat = val;
76 cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
77
78 smi_cmd.u64 = 0;
79 smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */
80 smi_cmd.s.phy_adr = phy_id;
81 smi_cmd.s.reg_adr = regnum;
82 cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
83
84 do {
85 /*
86 * Wait 1000 clocks so we don't saturate the RSL bus
87 * doing reads.
88 */
89 __delay(1000);
90 smi_wr.u64 = cvmx_read_csr(p->register_base + SMI_WR_DAT);
91 } while (smi_wr.s.pending && --timeout);
92
93 if (timeout <= 0)
94 return -EIO;
95
96 return 0;
97}
98
99static int octeon_mdiobus_probe(struct platform_device *pdev)
100{
101 struct octeon_mdiobus *bus;
102 struct resource *res_mem;
103 union cvmx_smix_en smi_en;
104 int err = -ENOENT;
105
106 bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
107 if (!bus)
108 return -ENOMEM;
109
110 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
111
112 if (res_mem == NULL) {
113 dev_err(&pdev->dev, "found no memory resource\n");
114 err = -ENXIO;
115 goto fail;
116 }
117 bus->mdio_phys = res_mem->start;
118 bus->regsize = resource_size(res_mem);
119 if (!devm_request_mem_region(&pdev->dev, bus->mdio_phys, bus->regsize,
120 res_mem->name)) {
121 dev_err(&pdev->dev, "request_mem_region failed\n");
122 goto fail;
123 }
124 bus->register_base =
125 (u64)devm_ioremap(&pdev->dev, bus->mdio_phys, bus->regsize);
126
127 bus->mii_bus = mdiobus_alloc();
128
129 if (!bus->mii_bus)
130 goto fail;
131
132 smi_en.u64 = 0;
133 smi_en.s.en = 1;
134 cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
135
136 bus->mii_bus->priv = bus;
137 bus->mii_bus->irq = bus->phy_irq;
138 bus->mii_bus->name = "mdio-octeon";
139 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
140 bus->mii_bus->parent = &pdev->dev;
141
142 bus->mii_bus->read = octeon_mdiobus_read;
143 bus->mii_bus->write = octeon_mdiobus_write;
144
145 dev_set_drvdata(&pdev->dev, bus);
146
147 err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
148 if (err)
149 goto fail_register;
150
151 dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
152
153 return 0;
154fail_register:
155 mdiobus_free(bus->mii_bus);
156fail:
157 smi_en.u64 = 0;
158 cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
159 return err;
160}
161
162static int octeon_mdiobus_remove(struct platform_device *pdev)
163{
164 struct octeon_mdiobus *bus;
165 union cvmx_smix_en smi_en;
166
167 bus = dev_get_drvdata(&pdev->dev);
168
169 mdiobus_unregister(bus->mii_bus);
170 mdiobus_free(bus->mii_bus);
171 smi_en.u64 = 0;
172 cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
173 return 0;
174}
175
176static struct of_device_id octeon_mdiobus_match[] = {
177 {
178 .compatible = "cavium,octeon-3860-mdio",
179 },
180 {},
181};
182MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
183
184static struct platform_driver octeon_mdiobus_driver = {
185 .driver = {
186 .name = "mdio-octeon",
187 .owner = THIS_MODULE,
188 .of_match_table = octeon_mdiobus_match,
189 },
190 .probe = octeon_mdiobus_probe,
191 .remove = octeon_mdiobus_remove,
192};
193
194void octeon_mdiobus_force_mod_depencency(void)
195{
196 /* Let ethernet drivers force us to be loaded. */
197}
198EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
199
200static int __init octeon_mdiobus_mod_init(void)
201{
202 return platform_driver_register(&octeon_mdiobus_driver);
203}
204
205static void __exit octeon_mdiobus_mod_exit(void)
206{
207 platform_driver_unregister(&octeon_mdiobus_driver);
208}
209
210module_init(octeon_mdiobus_mod_init);
211module_exit(octeon_mdiobus_mod_exit);
212
213MODULE_DESCRIPTION(DRV_DESCRIPTION);
214MODULE_VERSION(DRV_VERSION);
215MODULE_AUTHOR("David Daney");
216MODULE_LICENSE("GPL");