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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2009-2012 Cavium, Inc.
*/
#include <linux/platform_device.h>
#include <linux/of_mdio.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/phy.h>
#include <linux/io.h>
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-smix-defs.h>
#define DRV_VERSION "1.0"
#define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
#define SMI_CMD 0x0
#define SMI_WR_DAT 0x8
#define SMI_RD_DAT 0x10
#define SMI_CLK 0x18
#define SMI_EN 0x20
enum octeon_mdiobus_mode {
UNINIT = 0,
C22,
C45
};
struct octeon_mdiobus {
struct mii_bus *mii_bus;
u64 register_base;
resource_size_t mdio_phys;
resource_size_t regsize;
enum octeon_mdiobus_mode mode;
int phy_irq[PHY_MAX_ADDR];
};
static void octeon_mdiobus_set_mode(struct octeon_mdiobus *p,
enum octeon_mdiobus_mode m)
{
union cvmx_smix_clk smi_clk;
if (m == p->mode)
return;
smi_clk.u64 = cvmx_read_csr(p->register_base + SMI_CLK);
smi_clk.s.mode = (m == C45) ? 1 : 0;
smi_clk.s.preamble = 1;
cvmx_write_csr(p->register_base + SMI_CLK, smi_clk.u64);
p->mode = m;
}
static int octeon_mdiobus_c45_addr(struct octeon_mdiobus *p,
int phy_id, int regnum)
{
union cvmx_smix_cmd smi_cmd;
union cvmx_smix_wr_dat smi_wr;
int timeout = 1000;
octeon_mdiobus_set_mode(p, C45);
smi_wr.u64 = 0;
smi_wr.s.dat = regnum & 0xffff;
cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
regnum = (regnum >> 16) & 0x1f;
smi_cmd.u64 = 0;
smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */
smi_cmd.s.phy_adr = phy_id;
smi_cmd.s.reg_adr = regnum;
cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
do {
/* Wait 1000 clocks so we don't saturate the RSL bus
* doing reads.
*/
__delay(1000);
smi_wr.u64 = cvmx_read_csr(p->register_base + SMI_WR_DAT);
} while (smi_wr.s.pending && --timeout);
if (timeout <= 0)
return -EIO;
return 0;
}
static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
{
struct octeon_mdiobus *p = bus->priv;
union cvmx_smix_cmd smi_cmd;
union cvmx_smix_rd_dat smi_rd;
unsigned int op = 1; /* MDIO_CLAUSE_22_READ */
int timeout = 1000;
if (regnum & MII_ADDR_C45) {
int r = octeon_mdiobus_c45_addr(p, phy_id, regnum);
if (r < 0)
return r;
regnum = (regnum >> 16) & 0x1f;
op = 3; /* MDIO_CLAUSE_45_READ */
} else {
octeon_mdiobus_set_mode(p, C22);
}
smi_cmd.u64 = 0;
smi_cmd.s.phy_op = op;
smi_cmd.s.phy_adr = phy_id;
smi_cmd.s.reg_adr = regnum;
cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
do {
/* Wait 1000 clocks so we don't saturate the RSL bus
* doing reads.
*/
__delay(1000);
smi_rd.u64 = cvmx_read_csr(p->register_base + SMI_RD_DAT);
} while (smi_rd.s.pending && --timeout);
if (smi_rd.s.val)
return smi_rd.s.dat;
else
return -EIO;
}
static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,
int regnum, u16 val)
{
struct octeon_mdiobus *p = bus->priv;
union cvmx_smix_cmd smi_cmd;
union cvmx_smix_wr_dat smi_wr;
unsigned int op = 0; /* MDIO_CLAUSE_22_WRITE */
int timeout = 1000;
if (regnum & MII_ADDR_C45) {
int r = octeon_mdiobus_c45_addr(p, phy_id, regnum);
if (r < 0)
return r;
regnum = (regnum >> 16) & 0x1f;
op = 1; /* MDIO_CLAUSE_45_WRITE */
} else {
octeon_mdiobus_set_mode(p, C22);
}
smi_wr.u64 = 0;
smi_wr.s.dat = val;
cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
smi_cmd.u64 = 0;
smi_cmd.s.phy_op = op;
smi_cmd.s.phy_adr = phy_id;
smi_cmd.s.reg_adr = regnum;
cvmx_write_csr(p->register_base + SMI_CMD, smi_cmd.u64);
do {
/* Wait 1000 clocks so we don't saturate the RSL bus
* doing reads.
*/
__delay(1000);
smi_wr.u64 = cvmx_read_csr(p->register_base + SMI_WR_DAT);
} while (smi_wr.s.pending && --timeout);
if (timeout <= 0)
return -EIO;
return 0;
}
static int octeon_mdiobus_probe(struct platform_device *pdev)
{
struct octeon_mdiobus *bus;
struct resource *res_mem;
union cvmx_smix_en smi_en;
int err = -ENOENT;
bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
if (!bus)
return -ENOMEM;
res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res_mem == NULL) {
dev_err(&pdev->dev, "found no memory resource\n");
err = -ENXIO;
goto fail;
}
bus->mdio_phys = res_mem->start;
bus->regsize = resource_size(res_mem);
if (!devm_request_mem_region(&pdev->dev, bus->mdio_phys, bus->regsize,
res_mem->name)) {
dev_err(&pdev->dev, "request_mem_region failed\n");
goto fail;
}
bus->register_base =
(u64)devm_ioremap(&pdev->dev, bus->mdio_phys, bus->regsize);
bus->mii_bus = mdiobus_alloc();
if (!bus->mii_bus)
goto fail;
smi_en.u64 = 0;
smi_en.s.en = 1;
cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
bus->mii_bus->priv = bus;
bus->mii_bus->irq = bus->phy_irq;
bus->mii_bus->name = "mdio-octeon";
snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
bus->mii_bus->parent = &pdev->dev;
bus->mii_bus->read = octeon_mdiobus_read;
bus->mii_bus->write = octeon_mdiobus_write;
platform_set_drvdata(pdev, bus);
err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
if (err)
goto fail_register;
dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
return 0;
fail_register:
mdiobus_free(bus->mii_bus);
fail:
smi_en.u64 = 0;
cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
return err;
}
static int octeon_mdiobus_remove(struct platform_device *pdev)
{
struct octeon_mdiobus *bus;
union cvmx_smix_en smi_en;
bus = platform_get_drvdata(pdev);
mdiobus_unregister(bus->mii_bus);
mdiobus_free(bus->mii_bus);
smi_en.u64 = 0;
cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
return 0;
}
static struct of_device_id octeon_mdiobus_match[] = {
{
.compatible = "cavium,octeon-3860-mdio",
},
{},
};
MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
static struct platform_driver octeon_mdiobus_driver = {
.driver = {
.name = "mdio-octeon",
.owner = THIS_MODULE,
.of_match_table = octeon_mdiobus_match,
},
.probe = octeon_mdiobus_probe,
.remove = octeon_mdiobus_remove,
};
void octeon_mdiobus_force_mod_depencency(void)
{
/* Let ethernet drivers force us to be loaded. */
}
EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
module_platform_driver(octeon_mdiobus_driver);
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");
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