Loading...
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 Cavium Networks
7 */
8
9#include <linux/gfp.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/phy.h>
14
15#include <asm/octeon/octeon.h>
16#include <asm/octeon/cvmx-smix-defs.h>
17
18#define DRV_VERSION "1.0"
19#define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
20
21struct octeon_mdiobus {
22 struct mii_bus *mii_bus;
23 int unit;
24 int phy_irq[PHY_MAX_ADDR];
25};
26
27static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
28{
29 struct octeon_mdiobus *p = bus->priv;
30 union cvmx_smix_cmd smi_cmd;
31 union cvmx_smix_rd_dat smi_rd;
32 int timeout = 1000;
33
34 smi_cmd.u64 = 0;
35 smi_cmd.s.phy_op = 1; /* MDIO_CLAUSE_22_READ */
36 smi_cmd.s.phy_adr = phy_id;
37 smi_cmd.s.reg_adr = regnum;
38 cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);
39
40 do {
41 /*
42 * Wait 1000 clocks so we don't saturate the RSL bus
43 * doing reads.
44 */
45 cvmx_wait(1000);
46 smi_rd.u64 = cvmx_read_csr(CVMX_SMIX_RD_DAT(p->unit));
47 } while (smi_rd.s.pending && --timeout);
48
49 if (smi_rd.s.val)
50 return smi_rd.s.dat;
51 else
52 return -EIO;
53}
54
55static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
56 int regnum, u16 val)
57{
58 struct octeon_mdiobus *p = bus->priv;
59 union cvmx_smix_cmd smi_cmd;
60 union cvmx_smix_wr_dat smi_wr;
61 int timeout = 1000;
62
63 smi_wr.u64 = 0;
64 smi_wr.s.dat = val;
65 cvmx_write_csr(CVMX_SMIX_WR_DAT(p->unit), smi_wr.u64);
66
67 smi_cmd.u64 = 0;
68 smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_22_WRITE */
69 smi_cmd.s.phy_adr = phy_id;
70 smi_cmd.s.reg_adr = regnum;
71 cvmx_write_csr(CVMX_SMIX_CMD(p->unit), smi_cmd.u64);
72
73 do {
74 /*
75 * Wait 1000 clocks so we don't saturate the RSL bus
76 * doing reads.
77 */
78 cvmx_wait(1000);
79 smi_wr.u64 = cvmx_read_csr(CVMX_SMIX_WR_DAT(p->unit));
80 } while (smi_wr.s.pending && --timeout);
81
82 if (timeout <= 0)
83 return -EIO;
84
85 return 0;
86}
87
88static int __devinit octeon_mdiobus_probe(struct platform_device *pdev)
89{
90 struct octeon_mdiobus *bus;
91 union cvmx_smix_en smi_en;
92 int i;
93 int err = -ENOENT;
94
95 bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
96 if (!bus)
97 return -ENOMEM;
98
99 /* The platform_device id is our unit number. */
100 bus->unit = pdev->id;
101
102 bus->mii_bus = mdiobus_alloc();
103
104 if (!bus->mii_bus)
105 goto err;
106
107 smi_en.u64 = 0;
108 smi_en.s.en = 1;
109 cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
110
111 /*
112 * Standard Octeon evaluation boards don't support phy
113 * interrupts, we need to poll.
114 */
115 for (i = 0; i < PHY_MAX_ADDR; i++)
116 bus->phy_irq[i] = PHY_POLL;
117
118 bus->mii_bus->priv = bus;
119 bus->mii_bus->irq = bus->phy_irq;
120 bus->mii_bus->name = "mdio-octeon";
121 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%x", bus->unit);
122 bus->mii_bus->parent = &pdev->dev;
123
124 bus->mii_bus->read = octeon_mdiobus_read;
125 bus->mii_bus->write = octeon_mdiobus_write;
126
127 dev_set_drvdata(&pdev->dev, bus);
128
129 err = mdiobus_register(bus->mii_bus);
130 if (err)
131 goto err_register;
132
133 dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
134
135 return 0;
136err_register:
137 mdiobus_free(bus->mii_bus);
138
139err:
140 devm_kfree(&pdev->dev, bus);
141 smi_en.u64 = 0;
142 cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
143 return err;
144}
145
146static int __devexit octeon_mdiobus_remove(struct platform_device *pdev)
147{
148 struct octeon_mdiobus *bus;
149 union cvmx_smix_en smi_en;
150
151 bus = dev_get_drvdata(&pdev->dev);
152
153 mdiobus_unregister(bus->mii_bus);
154 mdiobus_free(bus->mii_bus);
155 smi_en.u64 = 0;
156 cvmx_write_csr(CVMX_SMIX_EN(bus->unit), smi_en.u64);
157 return 0;
158}
159
160static struct platform_driver octeon_mdiobus_driver = {
161 .driver = {
162 .name = "mdio-octeon",
163 .owner = THIS_MODULE,
164 },
165 .probe = octeon_mdiobus_probe,
166 .remove = __devexit_p(octeon_mdiobus_remove),
167};
168
169void octeon_mdiobus_force_mod_depencency(void)
170{
171 /* Let ethernet drivers force us to be loaded. */
172}
173EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
174
175static int __init octeon_mdiobus_mod_init(void)
176{
177 return platform_driver_register(&octeon_mdiobus_driver);
178}
179
180static void __exit octeon_mdiobus_mod_exit(void)
181{
182 platform_driver_unregister(&octeon_mdiobus_driver);
183}
184
185module_init(octeon_mdiobus_mod_init);
186module_exit(octeon_mdiobus_mod_exit);
187
188MODULE_DESCRIPTION(DRV_DESCRIPTION);
189MODULE_VERSION(DRV_VERSION);
190MODULE_AUTHOR("David Daney");
191MODULE_LICENSE("GPL");
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) 2009-2015 Cavium, Inc.
7 */
8
9#include <linux/platform_device.h>
10#include <linux/of_address.h>
11#include <linux/of_mdio.h>
12#include <linux/module.h>
13#include <linux/gfp.h>
14#include <linux/phy.h>
15#include <linux/io.h>
16
17#include "mdio-cavium.h"
18
19static int octeon_mdiobus_probe(struct platform_device *pdev)
20{
21 struct cavium_mdiobus *bus;
22 struct mii_bus *mii_bus;
23 struct resource *res_mem;
24 resource_size_t mdio_phys;
25 resource_size_t regsize;
26 union cvmx_smix_en smi_en;
27 int err = -ENOENT;
28
29 mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
30 if (!mii_bus)
31 return -ENOMEM;
32
33 res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
34 if (res_mem == NULL) {
35 dev_err(&pdev->dev, "found no memory resource\n");
36 return -ENXIO;
37 }
38
39 bus = mii_bus->priv;
40 bus->mii_bus = mii_bus;
41 mdio_phys = res_mem->start;
42 regsize = resource_size(res_mem);
43
44 if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
45 res_mem->name)) {
46 dev_err(&pdev->dev, "request_mem_region failed\n");
47 return -ENXIO;
48 }
49
50 bus->register_base =
51 (u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
52 if (!bus->register_base) {
53 dev_err(&pdev->dev, "dev_ioremap failed\n");
54 return -ENOMEM;
55 }
56
57 smi_en.u64 = 0;
58 smi_en.s.en = 1;
59 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
60
61 bus->mii_bus->name = KBUILD_MODNAME;
62 snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
63 bus->mii_bus->parent = &pdev->dev;
64
65 bus->mii_bus->read = cavium_mdiobus_read;
66 bus->mii_bus->write = cavium_mdiobus_write;
67
68 platform_set_drvdata(pdev, bus);
69
70 err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
71 if (err)
72 goto fail_register;
73
74 dev_info(&pdev->dev, "Probed\n");
75
76 return 0;
77fail_register:
78 mdiobus_free(bus->mii_bus);
79 smi_en.u64 = 0;
80 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
81 return err;
82}
83
84static int octeon_mdiobus_remove(struct platform_device *pdev)
85{
86 struct cavium_mdiobus *bus;
87 union cvmx_smix_en smi_en;
88
89 bus = platform_get_drvdata(pdev);
90
91 mdiobus_unregister(bus->mii_bus);
92 mdiobus_free(bus->mii_bus);
93 smi_en.u64 = 0;
94 oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
95 return 0;
96}
97
98static const struct of_device_id octeon_mdiobus_match[] = {
99 {
100 .compatible = "cavium,octeon-3860-mdio",
101 },
102 {},
103};
104MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
105
106static struct platform_driver octeon_mdiobus_driver = {
107 .driver = {
108 .name = KBUILD_MODNAME,
109 .of_match_table = octeon_mdiobus_match,
110 },
111 .probe = octeon_mdiobus_probe,
112 .remove = octeon_mdiobus_remove,
113};
114
115void octeon_mdiobus_force_mod_depencency(void)
116{
117 /* Let ethernet drivers force us to be loaded. */
118}
119EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
120
121module_platform_driver(octeon_mdiobus_driver);
122
123MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
124MODULE_AUTHOR("David Daney");
125MODULE_LICENSE("GPL");