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linux/drivers/net/ethernet/hisilicon/hns_mdio.c
Javier Martinez Canillas af40097e3e net: hisilicon: Fix hns_mdio module autoload for OF registration 
If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/ethernet/hisilicon//hns_mdio.ko | grep alias
alias:          platform:Hi-HNS_MDIO
alias:          acpi*:HISI0141:*

After this patch:

$ modinfo drivers/net/ethernet/hisilicon//hns_mdio.ko | grep alias
alias:          platform:Hi-HNS_MDIO
alias:          of:N*T*Chisilicon,hns-mdioC*
alias:          of:N*T*Chisilicon,hns-mdio
alias:          of:N*T*Chisilicon,mdioC*
alias:          of:N*T*Chisilicon,mdio
alias:          acpi*:HISI0141:*

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-17 13:03:03 -04:00

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/*
* Copyright (c) 2014-2015 Hisilicon Limited.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/acpi.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/spinlock_types.h>
#define MDIO_DRV_NAME "Hi-HNS_MDIO"
#define MDIO_BUS_NAME "Hisilicon MII Bus"
#define MDIO_DRV_VERSION "1.3.0"
#define MDIO_COPYRIGHT "Copyright(c) 2015 Huawei Corporation."
#define MDIO_DRV_STRING MDIO_BUS_NAME
#define MDIO_DEFAULT_DEVICE_DESCR MDIO_BUS_NAME
#define MDIO_CTL_DEV_ADDR(x) (x & 0x1f)
#define MDIO_CTL_PORT_ADDR(x) ((x & 0x1f) << 5)
#define MDIO_TIMEOUT 1000000
struct hns_mdio_sc_reg {
u16 mdio_clk_en;
u16 mdio_clk_dis;
u16 mdio_reset_req;
u16 mdio_reset_dreq;
u16 mdio_clk_st;
u16 mdio_reset_st;
};
struct hns_mdio_device {
void *vbase; /* mdio reg base address */
struct regmap *subctrl_vbase;
struct hns_mdio_sc_reg sc_reg;
};
/* mdio reg */
#define MDIO_COMMAND_REG 0x0
#define MDIO_ADDR_REG 0x4
#define MDIO_WDATA_REG 0x8
#define MDIO_RDATA_REG 0xc
#define MDIO_STA_REG 0x10
/* cfg phy bit map */
#define MDIO_CMD_DEVAD_M 0x1f
#define MDIO_CMD_DEVAD_S 0
#define MDIO_CMD_PRTAD_M 0x1f
#define MDIO_CMD_PRTAD_S 5
#define MDIO_CMD_OP_M 0x3
#define MDIO_CMD_OP_S 10
#define MDIO_CMD_ST_M 0x3
#define MDIO_CMD_ST_S 12
#define MDIO_CMD_START_B 14
#define MDIO_ADDR_DATA_M 0xffff
#define MDIO_ADDR_DATA_S 0
#define MDIO_WDATA_DATA_M 0xffff
#define MDIO_WDATA_DATA_S 0
#define MDIO_RDATA_DATA_M 0xffff
#define MDIO_RDATA_DATA_S 0
#define MDIO_STATE_STA_B 0
enum mdio_st_clause {
MDIO_ST_CLAUSE_45 = 0,
MDIO_ST_CLAUSE_22
};
enum mdio_c22_op_seq {
MDIO_C22_WRITE = 1,
MDIO_C22_READ = 2
};
enum mdio_c45_op_seq {
MDIO_C45_WRITE_ADDR = 0,
MDIO_C45_WRITE_DATA,
MDIO_C45_READ_INCREMENT,
MDIO_C45_READ
};
/* peri subctrl reg */
#define MDIO_SC_CLK_EN 0x338
#define MDIO_SC_CLK_DIS 0x33C
#define MDIO_SC_RESET_REQ 0xA38
#define MDIO_SC_RESET_DREQ 0xA3C
#define MDIO_SC_CLK_ST 0x531C
#define MDIO_SC_RESET_ST 0x5A1C
static void mdio_write_reg(void *base, u32 reg, u32 value)
{
u8 __iomem *reg_addr = (u8 __iomem *)base;
writel_relaxed(value, reg_addr + reg);
}
#define MDIO_WRITE_REG(a, reg, value) \
mdio_write_reg((a)->vbase, (reg), (value))
static u32 mdio_read_reg(void *base, u32 reg)
{
u8 __iomem *reg_addr = (u8 __iomem *)base;
return readl_relaxed(reg_addr + reg);
}
#define mdio_set_field(origin, mask, shift, val) \
do { \
(origin) &= (~((mask) << (shift))); \
(origin) |= (((val) & (mask)) << (shift)); \
} while (0)
#define mdio_get_field(origin, mask, shift) (((origin) >> (shift)) & (mask))
static void mdio_set_reg_field(void *base, u32 reg, u32 mask, u32 shift,
u32 val)
{
u32 origin = mdio_read_reg(base, reg);
mdio_set_field(origin, mask, shift, val);
mdio_write_reg(base, reg, origin);
}
#define MDIO_SET_REG_FIELD(dev, reg, mask, shift, val) \
mdio_set_reg_field((dev)->vbase, (reg), (mask), (shift), (val))
static u32 mdio_get_reg_field(void *base, u32 reg, u32 mask, u32 shift)
{
u32 origin;
origin = mdio_read_reg(base, reg);
return mdio_get_field(origin, mask, shift);
}
#define MDIO_GET_REG_FIELD(dev, reg, mask, shift) \
mdio_get_reg_field((dev)->vbase, (reg), (mask), (shift))
#define MDIO_GET_REG_BIT(dev, reg, bit) \
mdio_get_reg_field((dev)->vbase, (reg), 0x1ull, (bit))
#define MDIO_CHECK_SET_ST 1
#define MDIO_CHECK_CLR_ST 0
static int mdio_sc_cfg_reg_write(struct hns_mdio_device *mdio_dev,
u32 cfg_reg, u32 set_val,
u32 st_reg, u32 st_msk, u8 check_st)
{
u32 time_cnt;
u32 reg_value;
regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val);
for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
regmap_read(mdio_dev->subctrl_vbase, st_reg, &reg_value);
reg_value &= st_msk;
if ((!!check_st) == (!!reg_value))
break;
}
if ((!!check_st) != (!!reg_value))
return -EBUSY;
return 0;
}
static int hns_mdio_wait_ready(struct mii_bus *bus)
{
struct hns_mdio_device *mdio_dev = bus->priv;
int i;
u32 cmd_reg_value = 1;
/* waitting for MDIO_COMMAND_REG 's mdio_start==0 */
/* after that can do read or write*/
for (i = 0; cmd_reg_value; i++) {
cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
MDIO_COMMAND_REG,
MDIO_CMD_START_B);
if (i == MDIO_TIMEOUT)
return -ETIMEDOUT;
}
return 0;
}
static void hns_mdio_cmd_write(struct hns_mdio_device *mdio_dev,
u8 is_c45, u8 op, u8 phy_id, u16 cmd)
{
u32 cmd_reg_value;
u8 st = is_c45 ? MDIO_ST_CLAUSE_45 : MDIO_ST_CLAUSE_22;
cmd_reg_value = st << MDIO_CMD_ST_S;
cmd_reg_value |= op << MDIO_CMD_OP_S;
cmd_reg_value |=
(phy_id & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
cmd_reg_value |= (cmd & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
cmd_reg_value |= 1 << MDIO_CMD_START_B;
MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
}
/**
* hns_mdio_write - access phy register
* @bus: mdio bus
* @phy_id: phy id
* @regnum: register num
* @value: register value
*
* Return 0 on success, negative on failure
*/
static int hns_mdio_write(struct mii_bus *bus,
int phy_id, int regnum, u16 data)
{
int ret;
struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
u8 devad = ((regnum >> 16) & 0x1f);
u8 is_c45 = !!(regnum & MII_ADDR_C45);
u16 reg = (u16)(regnum & 0xffff);
u8 op;
u16 cmd_reg_cfg;
dev_dbg(&bus->dev, "mdio write %s,base is %p\n",
bus->id, mdio_dev->vbase);
dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x, write data=%d\n",
phy_id, is_c45, devad, reg, data);
/* wait for ready */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
if (!is_c45) {
cmd_reg_cfg = reg;
op = MDIO_C22_WRITE;
} else {
/* config the cmd-reg to write addr*/
MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
MDIO_ADDR_DATA_S, reg);
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C45_WRITE_ADDR, phy_id, devad);
/* check for read or write opt is finished */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
/* config the data needed writing */
cmd_reg_cfg = devad;
op = MDIO_C45_WRITE_ADDR;
}
MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
MDIO_WDATA_DATA_S, data);
hns_mdio_cmd_write(mdio_dev, is_c45, op, phy_id, cmd_reg_cfg);
return 0;
}
/**
* hns_mdio_read - access phy register
* @bus: mdio bus
* @phy_id: phy id
* @regnum: register num
* @value: register value
*
* Return phy register value
*/
static int hns_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
{
int ret;
u16 reg_val = 0;
u8 devad = ((regnum >> 16) & 0x1f);
u8 is_c45 = !!(regnum & MII_ADDR_C45);
u16 reg = (u16)(regnum & 0xffff);
struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
dev_dbg(&bus->dev, "mdio read %s,base is %p\n",
bus->id, mdio_dev->vbase);
dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x!\n",
phy_id, is_c45, devad, reg);
/* Step 1: wait for ready */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
if (!is_c45) {
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C22_READ, phy_id, reg);
} else {
MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
MDIO_ADDR_DATA_S, reg);
/* Step 2; config the cmd-reg to write addr*/
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C45_WRITE_ADDR, phy_id, devad);
/* Step 3: check for read or write opt is finished */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C45_WRITE_ADDR, phy_id, devad);
}
/* Step 5: waitting for MDIO_COMMAND_REG 's mdio_start==0,*/
/* check for read or write opt is finished */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
reg_val = MDIO_GET_REG_BIT(mdio_dev, MDIO_STA_REG, MDIO_STATE_STA_B);
if (reg_val) {
dev_err(&bus->dev, " ERROR! MDIO Read failed!\n");
return -EBUSY;
}
/* Step 6; get out data*/
reg_val = (u16)MDIO_GET_REG_FIELD(mdio_dev, MDIO_RDATA_REG,
MDIO_RDATA_DATA_M, MDIO_RDATA_DATA_S);
return reg_val;
}
/**
* hns_mdio_reset - reset mdio bus
* @bus: mdio bus
*
* Return 0 on success, negative on failure
*/
static int hns_mdio_reset(struct mii_bus *bus)
{
struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
const struct hns_mdio_sc_reg *sc_reg;
int ret;
if (dev_of_node(bus->parent)) {
if (!mdio_dev->subctrl_vbase) {
dev_err(&bus->dev, "mdio sys ctl reg has not maped\n");
return -ENODEV;
}
sc_reg = &mdio_dev->sc_reg;
/* 1. reset req, and read reset st check */
ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_reset_req,
0x1, sc_reg->mdio_reset_st, 0x1,
MDIO_CHECK_SET_ST);
if (ret) {
dev_err(&bus->dev, "MDIO reset fail\n");
return ret;
}
/* 2. dis clk, and read clk st check */
ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_clk_dis,
0x1, sc_reg->mdio_clk_st, 0x1,
MDIO_CHECK_CLR_ST);
if (ret) {
dev_err(&bus->dev, "MDIO dis clk fail\n");
return ret;
}
/* 3. reset dreq, and read reset st check */
ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_reset_dreq,
0x1, sc_reg->mdio_reset_st, 0x1,
MDIO_CHECK_CLR_ST);
if (ret) {
dev_err(&bus->dev, "MDIO dis clk fail\n");
return ret;
}
/* 4. en clk, and read clk st check */
ret = mdio_sc_cfg_reg_write(mdio_dev, sc_reg->mdio_clk_en,
0x1, sc_reg->mdio_clk_st, 0x1,
MDIO_CHECK_SET_ST);
if (ret)
dev_err(&bus->dev, "MDIO en clk fail\n");
} else if (is_acpi_node(bus->parent->fwnode)) {
acpi_status s;
s = acpi_evaluate_object(ACPI_HANDLE(bus->parent),
"_RST", NULL, NULL);
if (ACPI_FAILURE(s)) {
dev_err(&bus->dev, "Reset failed, return:%#x\n", s);
ret = -EBUSY;
} else {
ret = 0;
}
} else {
dev_err(&bus->dev, "Can not get cfg data from DT or ACPI\n");
ret = -ENXIO;
}
return ret;
}
/**
* hns_mdio_probe - probe mdio device
* @pdev: mdio platform device
*
* Return 0 on success, negative on failure
*/
static int hns_mdio_probe(struct platform_device *pdev)
{
struct hns_mdio_device *mdio_dev;
struct mii_bus *new_bus;
struct resource *res;
int ret = -ENODEV;
if (!pdev) {
dev_err(NULL, "pdev is NULL!\r\n");
return -ENODEV;
}
mdio_dev = devm_kzalloc(&pdev->dev, sizeof(*mdio_dev), GFP_KERNEL);
if (!mdio_dev)
return -ENOMEM;
new_bus = devm_mdiobus_alloc(&pdev->dev);
if (!new_bus) {
dev_err(&pdev->dev, "mdiobus_alloc fail!\n");
return -ENOMEM;
}
new_bus->name = MDIO_BUS_NAME;
new_bus->read = hns_mdio_read;
new_bus->write = hns_mdio_write;
new_bus->reset = hns_mdio_reset;
new_bus->priv = mdio_dev;
new_bus->parent = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mdio_dev->vbase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mdio_dev->vbase)) {
ret = PTR_ERR(mdio_dev->vbase);
return ret;
}
platform_set_drvdata(pdev, new_bus);
snprintf(new_bus->id, MII_BUS_ID_SIZE, "%s-%s", "Mii",
dev_name(&pdev->dev));
if (dev_of_node(&pdev->dev)) {
struct of_phandle_args reg_args;
ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node,
"subctrl-vbase",
4,
0,
&reg_args);
if (!ret) {
mdio_dev->subctrl_vbase =
syscon_node_to_regmap(reg_args.np);
if (IS_ERR(mdio_dev->subctrl_vbase)) {
dev_warn(&pdev->dev, "syscon_node_to_regmap error\n");
mdio_dev->subctrl_vbase = NULL;
} else {
if (reg_args.args_count == 4) {
mdio_dev->sc_reg.mdio_clk_en =
(u16)reg_args.args[0];
mdio_dev->sc_reg.mdio_clk_dis =
(u16)reg_args.args[0] + 4;
mdio_dev->sc_reg.mdio_reset_req =
(u16)reg_args.args[1];
mdio_dev->sc_reg.mdio_reset_dreq =
(u16)reg_args.args[1] + 4;
mdio_dev->sc_reg.mdio_clk_st =
(u16)reg_args.args[2];
mdio_dev->sc_reg.mdio_reset_st =
(u16)reg_args.args[3];
} else {
/* for compatible */
mdio_dev->sc_reg.mdio_clk_en =
MDIO_SC_CLK_EN;
mdio_dev->sc_reg.mdio_clk_dis =
MDIO_SC_CLK_DIS;
mdio_dev->sc_reg.mdio_reset_req =
MDIO_SC_RESET_REQ;
mdio_dev->sc_reg.mdio_reset_dreq =
MDIO_SC_RESET_DREQ;
mdio_dev->sc_reg.mdio_clk_st =
MDIO_SC_CLK_ST;
mdio_dev->sc_reg.mdio_reset_st =
MDIO_SC_RESET_ST;
}
}
} else {
dev_warn(&pdev->dev, "find syscon ret = %#x\n", ret);
mdio_dev->subctrl_vbase = NULL;
}
ret = of_mdiobus_register(new_bus, pdev->dev.of_node);
} else if (is_acpi_node(pdev->dev.fwnode)) {
/* Clear all the IRQ properties */
memset(new_bus->irq, PHY_POLL, 4 * PHY_MAX_ADDR);
/* Mask out all PHYs from auto probing. */
new_bus->phy_mask = ~0;
/* Register the MDIO bus */
ret = mdiobus_register(new_bus);
} else {
dev_err(&pdev->dev, "Can not get cfg data from DT or ACPI\n");
ret = -ENXIO;
}
if (ret) {
dev_err(&pdev->dev, "Cannot register as MDIO bus!\n");
platform_set_drvdata(pdev, NULL);
return ret;
}
return 0;
}
/**
* hns_mdio_remove - remove mdio device
* @pdev: mdio platform device
*
* Return 0 on success, negative on failure
*/
static int hns_mdio_remove(struct platform_device *pdev)
{
struct mii_bus *bus;
bus = platform_get_drvdata(pdev);
mdiobus_unregister(bus);
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id hns_mdio_match[] = {
{.compatible = "hisilicon,mdio"},
{.compatible = "hisilicon,hns-mdio"},
{}
};
MODULE_DEVICE_TABLE(of, hns_mdio_match);
static const struct acpi_device_id hns_mdio_acpi_match[] = {
{ "HISI0141", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, hns_mdio_acpi_match);
static struct platform_driver hns_mdio_driver = {
.probe = hns_mdio_probe,
.remove = hns_mdio_remove,
.driver = {
.name = MDIO_DRV_NAME,
.of_match_table = hns_mdio_match,
.acpi_match_table = ACPI_PTR(hns_mdio_acpi_match),
},
};
module_platform_driver(hns_mdio_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Huawei Tech. Co., Ltd.");
MODULE_DESCRIPTION("Hisilicon HNS MDIO driver");
MODULE_ALIAS("platform:" MDIO_DRV_NAME);
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