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Release 4.11 drivers/net/ethernet/hisilicon/hns_mdio.c

/*
 * 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); }

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#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); }

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#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); }

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#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); }

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#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; }

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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; }

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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); }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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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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