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net: mdio-octeon: Modify driver to work on both ThunderX and Octeon
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This patch modifies the mdio-octeon driver to work on both ThunderX and
Octeon SoCs from Cavium Inc.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Radha Mohan Chintakuntla authored and David S. Miller committed Jul 30, 2015
1 parent 71382bc commit a6d6786
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Showing 2 changed files with 111 additions and 21 deletions.
10 changes: 5 additions & 5 deletions drivers/net/phy/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -150,13 +150,13 @@ config MDIO_GPIO
will be called mdio-gpio.

config MDIO_OCTEON
tristate "Support for MDIO buses on Octeon SOCs"
depends on CAVIUM_OCTEON_SOC
default y
tristate "Support for MDIO buses on Octeon and ThunderX SOCs"
depends on 64BIT
help

This module provides a driver for the Octeon MDIO busses.
It is required by the Octeon Ethernet device drivers.
This module provides a driver for the Octeon and ThunderX MDIO
busses. It is required by the Octeon and ThunderX ethernet device
drivers.

If in doubt, say Y.

Expand Down
122 changes: 106 additions & 16 deletions drivers/net/phy/mdio-octeon.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,25 +7,100 @@
*/

#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/phy.h>
#include <linux/io.h>

#ifdef CONFIG_CAVIUM_OCTEON_SOC
#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-smix-defs.h>
#endif

#define DRV_VERSION "1.0"
#define DRV_DESCRIPTION "Cavium Networks Octeon SMI/MDIO driver"
#define DRV_VERSION "1.1"
#define DRV_DESCRIPTION "Cavium Networks Octeon/ThunderX 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

#ifdef __BIG_ENDIAN_BITFIELD
#define OCT_MDIO_BITFIELD_FIELD(field, more) \
field; \
more

#else
#define OCT_MDIO_BITFIELD_FIELD(field, more) \
more \
field;

#endif

union cvmx_smix_clk {
u64 u64;
struct cvmx_smix_clk_s {
OCT_MDIO_BITFIELD_FIELD(u64 reserved_25_63:39,
OCT_MDIO_BITFIELD_FIELD(u64 mode:1,
OCT_MDIO_BITFIELD_FIELD(u64 reserved_21_23:3,
OCT_MDIO_BITFIELD_FIELD(u64 sample_hi:5,
OCT_MDIO_BITFIELD_FIELD(u64 sample_mode:1,
OCT_MDIO_BITFIELD_FIELD(u64 reserved_14_14:1,
OCT_MDIO_BITFIELD_FIELD(u64 clk_idle:1,
OCT_MDIO_BITFIELD_FIELD(u64 preamble:1,
OCT_MDIO_BITFIELD_FIELD(u64 sample:4,
OCT_MDIO_BITFIELD_FIELD(u64 phase:8,
;))))))))))
} s;
};

union cvmx_smix_cmd {
u64 u64;
struct cvmx_smix_cmd_s {
OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
OCT_MDIO_BITFIELD_FIELD(u64 phy_op:2,
OCT_MDIO_BITFIELD_FIELD(u64 reserved_13_15:3,
OCT_MDIO_BITFIELD_FIELD(u64 phy_adr:5,
OCT_MDIO_BITFIELD_FIELD(u64 reserved_5_7:3,
OCT_MDIO_BITFIELD_FIELD(u64 reg_adr:5,
;))))))
} s;
};

union cvmx_smix_en {
u64 u64;
struct cvmx_smix_en_s {
OCT_MDIO_BITFIELD_FIELD(u64 reserved_1_63:63,
OCT_MDIO_BITFIELD_FIELD(u64 en:1,
;))
} s;
};

union cvmx_smix_rd_dat {
u64 u64;
struct cvmx_smix_rd_dat_s {
OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
OCT_MDIO_BITFIELD_FIELD(u64 pending:1,
OCT_MDIO_BITFIELD_FIELD(u64 val:1,
OCT_MDIO_BITFIELD_FIELD(u64 dat:16,
;))))
} s;
};

union cvmx_smix_wr_dat {
u64 u64;
struct cvmx_smix_wr_dat_s {
OCT_MDIO_BITFIELD_FIELD(u64 reserved_18_63:46,
OCT_MDIO_BITFIELD_FIELD(u64 pending:1,
OCT_MDIO_BITFIELD_FIELD(u64 val:1,
OCT_MDIO_BITFIELD_FIELD(u64 dat:16,
;))))
} s;
};

enum octeon_mdiobus_mode {
UNINIT = 0,
C22,
Expand All @@ -41,6 +116,21 @@ struct octeon_mdiobus {
int phy_irq[PHY_MAX_ADDR];
};

#ifdef CONFIG_CAVIUM_OCTEON_SOC
static void oct_mdio_writeq(u64 val, u64 addr)
{
cvmx_write_csr(addr, val);
}

static u64 oct_mdio_readq(u64 addr)
{
return cvmx_read_csr(addr);
}
#else
#define oct_mdio_writeq(val, addr) writeq_relaxed(val, (void *)addr)
#define oct_mdio_readq(addr) readq_relaxed((void *)addr)
#endif

static void octeon_mdiobus_set_mode(struct octeon_mdiobus *p,
enum octeon_mdiobus_mode m)
{
Expand All @@ -49,10 +139,10 @@ static void octeon_mdiobus_set_mode(struct octeon_mdiobus *p,
if (m == p->mode)
return;

smi_clk.u64 = cvmx_read_csr(p->register_base + SMI_CLK);
smi_clk.u64 = oct_mdio_readq(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);
oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK);
p->mode = m;
}

Expand All @@ -67,22 +157,22 @@ static int octeon_mdiobus_c45_addr(struct octeon_mdiobus *p,

smi_wr.u64 = 0;
smi_wr.s.dat = regnum & 0xffff;
cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);

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);
oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);

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);
smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
} while (smi_wr.s.pending && --timeout);

if (timeout <= 0)
Expand Down Expand Up @@ -114,14 +204,14 @@ static int octeon_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum)
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);
oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);

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);
smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT);
} while (smi_rd.s.pending && --timeout);

if (smi_rd.s.val)
Expand Down Expand Up @@ -153,20 +243,20 @@ static int octeon_mdiobus_write(struct mii_bus *bus, int phy_id,

smi_wr.u64 = 0;
smi_wr.s.dat = val;
cvmx_write_csr(p->register_base + SMI_WR_DAT, smi_wr.u64);
oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT);

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);
oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD);

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);
smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT);
} while (smi_wr.s.pending && --timeout);

if (timeout <= 0)
Expand Down Expand Up @@ -210,7 +300,7 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)

smi_en.u64 = 0;
smi_en.s.en = 1;
cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);

bus->mii_bus->priv = bus;
bus->mii_bus->irq = bus->phy_irq;
Expand All @@ -234,7 +324,7 @@ static int octeon_mdiobus_probe(struct platform_device *pdev)
mdiobus_free(bus->mii_bus);
fail:
smi_en.u64 = 0;
cvmx_write_csr(bus->register_base + SMI_EN, smi_en.u64);
oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
return err;
}

Expand All @@ -248,7 +338,7 @@ static int octeon_mdiobus_remove(struct platform_device *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);
oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
return 0;
}

Expand Down

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