523 lines
10 KiB
C
523 lines
10 KiB
C
/*
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* net/dsa/mv88e6xxx.c - Marvell 88e6xxx switch chip support
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* Copyright (c) 2008 Marvell Semiconductor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/phy.h>
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#include "dsa_priv.h"
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#include "mv88e6xxx.h"
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/*
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* If the switch's ADDR[4:0] strap pins are strapped to zero, it will
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* use all 32 SMI bus addresses on its SMI bus, and all switch registers
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* will be directly accessible on some {device address,register address}
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* pair. If the ADDR[4:0] pins are not strapped to zero, the switch
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* will only respond to SMI transactions to that specific address, and
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* an indirect addressing mechanism needs to be used to access its
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* registers.
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*/
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static int mv88e6xxx_reg_wait_ready(struct mii_bus *bus, int sw_addr)
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{
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int ret;
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int i;
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for (i = 0; i < 16; i++) {
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ret = mdiobus_read(bus, sw_addr, 0);
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if (ret < 0)
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return ret;
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if ((ret & 0x8000) == 0)
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return 0;
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}
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return -ETIMEDOUT;
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}
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int __mv88e6xxx_reg_read(struct mii_bus *bus, int sw_addr, int addr, int reg)
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{
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int ret;
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if (sw_addr == 0)
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return mdiobus_read(bus, addr, reg);
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/*
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* Wait for the bus to become free.
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*/
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ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
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if (ret < 0)
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return ret;
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/*
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* Transmit the read command.
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*/
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ret = mdiobus_write(bus, sw_addr, 0, 0x9800 | (addr << 5) | reg);
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if (ret < 0)
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return ret;
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/*
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* Wait for the read command to complete.
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*/
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ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
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if (ret < 0)
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return ret;
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/*
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* Read the data.
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*/
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ret = mdiobus_read(bus, sw_addr, 1);
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if (ret < 0)
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return ret;
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return ret & 0xffff;
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}
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int mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg)
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{
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struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
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int ret;
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mutex_lock(&ps->smi_mutex);
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ret = __mv88e6xxx_reg_read(ds->master_mii_bus,
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ds->pd->sw_addr, addr, reg);
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mutex_unlock(&ps->smi_mutex);
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return ret;
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}
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int __mv88e6xxx_reg_write(struct mii_bus *bus, int sw_addr, int addr,
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int reg, u16 val)
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{
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int ret;
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if (sw_addr == 0)
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return mdiobus_write(bus, addr, reg, val);
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/*
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* Wait for the bus to become free.
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*/
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ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
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if (ret < 0)
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return ret;
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/*
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* Transmit the data to write.
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*/
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ret = mdiobus_write(bus, sw_addr, 1, val);
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if (ret < 0)
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return ret;
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/*
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* Transmit the write command.
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*/
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ret = mdiobus_write(bus, sw_addr, 0, 0x9400 | (addr << 5) | reg);
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if (ret < 0)
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return ret;
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/*
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* Wait for the write command to complete.
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*/
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ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
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if (ret < 0)
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return ret;
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return 0;
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}
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int mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
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{
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struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
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int ret;
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mutex_lock(&ps->smi_mutex);
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ret = __mv88e6xxx_reg_write(ds->master_mii_bus,
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ds->pd->sw_addr, addr, reg, val);
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mutex_unlock(&ps->smi_mutex);
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return ret;
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}
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int mv88e6xxx_config_prio(struct dsa_switch *ds)
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{
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/*
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* Configure the IP ToS mapping registers.
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*/
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REG_WRITE(REG_GLOBAL, 0x10, 0x0000);
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REG_WRITE(REG_GLOBAL, 0x11, 0x0000);
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REG_WRITE(REG_GLOBAL, 0x12, 0x5555);
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REG_WRITE(REG_GLOBAL, 0x13, 0x5555);
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REG_WRITE(REG_GLOBAL, 0x14, 0xaaaa);
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REG_WRITE(REG_GLOBAL, 0x15, 0xaaaa);
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REG_WRITE(REG_GLOBAL, 0x16, 0xffff);
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REG_WRITE(REG_GLOBAL, 0x17, 0xffff);
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/*
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* Configure the IEEE 802.1p priority mapping register.
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*/
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REG_WRITE(REG_GLOBAL, 0x18, 0xfa41);
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return 0;
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}
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int mv88e6xxx_set_addr_direct(struct dsa_switch *ds, u8 *addr)
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{
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REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
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REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
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REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
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return 0;
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}
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int mv88e6xxx_set_addr_indirect(struct dsa_switch *ds, u8 *addr)
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{
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int i;
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int ret;
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for (i = 0; i < 6; i++) {
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int j;
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/*
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* Write the MAC address byte.
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*/
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REG_WRITE(REG_GLOBAL2, 0x0d, 0x8000 | (i << 8) | addr[i]);
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/*
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* Wait for the write to complete.
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*/
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for (j = 0; j < 16; j++) {
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ret = REG_READ(REG_GLOBAL2, 0x0d);
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if ((ret & 0x8000) == 0)
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break;
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}
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if (j == 16)
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return -ETIMEDOUT;
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}
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return 0;
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}
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int mv88e6xxx_phy_read(struct dsa_switch *ds, int addr, int regnum)
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{
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if (addr >= 0)
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return mv88e6xxx_reg_read(ds, addr, regnum);
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return 0xffff;
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}
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int mv88e6xxx_phy_write(struct dsa_switch *ds, int addr, int regnum, u16 val)
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{
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if (addr >= 0)
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return mv88e6xxx_reg_write(ds, addr, regnum, val);
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return 0;
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}
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#ifdef CONFIG_NET_DSA_MV88E6XXX_NEED_PPU
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static int mv88e6xxx_ppu_disable(struct dsa_switch *ds)
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{
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int ret;
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int i;
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ret = REG_READ(REG_GLOBAL, 0x04);
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REG_WRITE(REG_GLOBAL, 0x04, ret & ~0x4000);
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for (i = 0; i < 1000; i++) {
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ret = REG_READ(REG_GLOBAL, 0x00);
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msleep(1);
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if ((ret & 0xc000) != 0xc000)
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return 0;
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}
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return -ETIMEDOUT;
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}
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static int mv88e6xxx_ppu_enable(struct dsa_switch *ds)
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{
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int ret;
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int i;
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ret = REG_READ(REG_GLOBAL, 0x04);
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REG_WRITE(REG_GLOBAL, 0x04, ret | 0x4000);
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for (i = 0; i < 1000; i++) {
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ret = REG_READ(REG_GLOBAL, 0x00);
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msleep(1);
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if ((ret & 0xc000) == 0xc000)
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return 0;
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}
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return -ETIMEDOUT;
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}
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static void mv88e6xxx_ppu_reenable_work(struct work_struct *ugly)
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{
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struct mv88e6xxx_priv_state *ps;
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ps = container_of(ugly, struct mv88e6xxx_priv_state, ppu_work);
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if (mutex_trylock(&ps->ppu_mutex)) {
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struct dsa_switch *ds = ((struct dsa_switch *)ps) - 1;
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if (mv88e6xxx_ppu_enable(ds) == 0)
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ps->ppu_disabled = 0;
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mutex_unlock(&ps->ppu_mutex);
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}
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}
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static void mv88e6xxx_ppu_reenable_timer(unsigned long _ps)
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{
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struct mv88e6xxx_priv_state *ps = (void *)_ps;
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schedule_work(&ps->ppu_work);
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}
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static int mv88e6xxx_ppu_access_get(struct dsa_switch *ds)
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{
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struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
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int ret;
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mutex_lock(&ps->ppu_mutex);
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/*
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* If the PHY polling unit is enabled, disable it so that
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* we can access the PHY registers. If it was already
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* disabled, cancel the timer that is going to re-enable
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* it.
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*/
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if (!ps->ppu_disabled) {
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ret = mv88e6xxx_ppu_disable(ds);
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if (ret < 0) {
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mutex_unlock(&ps->ppu_mutex);
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return ret;
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}
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ps->ppu_disabled = 1;
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} else {
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del_timer(&ps->ppu_timer);
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ret = 0;
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}
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return ret;
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}
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static void mv88e6xxx_ppu_access_put(struct dsa_switch *ds)
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{
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struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
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/*
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* Schedule a timer to re-enable the PHY polling unit.
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*/
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mod_timer(&ps->ppu_timer, jiffies + msecs_to_jiffies(10));
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mutex_unlock(&ps->ppu_mutex);
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}
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void mv88e6xxx_ppu_state_init(struct dsa_switch *ds)
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{
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struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
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mutex_init(&ps->ppu_mutex);
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INIT_WORK(&ps->ppu_work, mv88e6xxx_ppu_reenable_work);
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init_timer(&ps->ppu_timer);
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ps->ppu_timer.data = (unsigned long)ps;
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ps->ppu_timer.function = mv88e6xxx_ppu_reenable_timer;
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}
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int mv88e6xxx_phy_read_ppu(struct dsa_switch *ds, int addr, int regnum)
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{
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int ret;
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ret = mv88e6xxx_ppu_access_get(ds);
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if (ret >= 0) {
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ret = mv88e6xxx_reg_read(ds, addr, regnum);
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mv88e6xxx_ppu_access_put(ds);
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}
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return ret;
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}
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int mv88e6xxx_phy_write_ppu(struct dsa_switch *ds, int addr,
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int regnum, u16 val)
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{
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int ret;
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ret = mv88e6xxx_ppu_access_get(ds);
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if (ret >= 0) {
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ret = mv88e6xxx_reg_write(ds, addr, regnum, val);
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mv88e6xxx_ppu_access_put(ds);
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}
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return ret;
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}
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#endif
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void mv88e6xxx_poll_link(struct dsa_switch *ds)
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{
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int i;
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for (i = 0; i < DSA_MAX_PORTS; i++) {
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struct net_device *dev;
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int uninitialized_var(port_status);
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int link;
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int speed;
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int duplex;
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int fc;
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dev = ds->ports[i];
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if (dev == NULL)
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continue;
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link = 0;
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if (dev->flags & IFF_UP) {
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port_status = mv88e6xxx_reg_read(ds, REG_PORT(i), 0x00);
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if (port_status < 0)
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continue;
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link = !!(port_status & 0x0800);
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}
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if (!link) {
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if (netif_carrier_ok(dev)) {
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printk(KERN_INFO "%s: link down\n", dev->name);
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netif_carrier_off(dev);
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}
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continue;
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}
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switch (port_status & 0x0300) {
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case 0x0000:
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speed = 10;
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break;
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case 0x0100:
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speed = 100;
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break;
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case 0x0200:
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speed = 1000;
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break;
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default:
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speed = -1;
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break;
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}
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duplex = (port_status & 0x0400) ? 1 : 0;
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fc = (port_status & 0x8000) ? 1 : 0;
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if (!netif_carrier_ok(dev)) {
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printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
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"flow control %sabled\n", dev->name,
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speed, duplex ? "full" : "half",
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fc ? "en" : "dis");
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netif_carrier_on(dev);
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}
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}
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}
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static int mv88e6xxx_stats_wait(struct dsa_switch *ds)
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{
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int ret;
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int i;
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for (i = 0; i < 10; i++) {
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ret = REG_READ(REG_GLOBAL, 0x1d);
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if ((ret & 0x8000) == 0)
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return 0;
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}
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return -ETIMEDOUT;
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}
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static int mv88e6xxx_stats_snapshot(struct dsa_switch *ds, int port)
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{
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int ret;
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/*
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* Snapshot the hardware statistics counters for this port.
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*/
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REG_WRITE(REG_GLOBAL, 0x1d, 0xdc00 | port);
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/*
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* Wait for the snapshotting to complete.
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*/
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ret = mv88e6xxx_stats_wait(ds);
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if (ret < 0)
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return ret;
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return 0;
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}
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static void mv88e6xxx_stats_read(struct dsa_switch *ds, int stat, u32 *val)
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{
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u32 _val;
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int ret;
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*val = 0;
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ret = mv88e6xxx_reg_write(ds, REG_GLOBAL, 0x1d, 0xcc00 | stat);
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if (ret < 0)
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return;
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ret = mv88e6xxx_stats_wait(ds);
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if (ret < 0)
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return;
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ret = mv88e6xxx_reg_read(ds, REG_GLOBAL, 0x1e);
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if (ret < 0)
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return;
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_val = ret << 16;
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ret = mv88e6xxx_reg_read(ds, REG_GLOBAL, 0x1f);
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if (ret < 0)
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return;
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*val = _val | ret;
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}
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void mv88e6xxx_get_strings(struct dsa_switch *ds,
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int nr_stats, struct mv88e6xxx_hw_stat *stats,
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int port, uint8_t *data)
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{
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int i;
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for (i = 0; i < nr_stats; i++) {
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memcpy(data + i * ETH_GSTRING_LEN,
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stats[i].string, ETH_GSTRING_LEN);
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}
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}
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void mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
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int nr_stats, struct mv88e6xxx_hw_stat *stats,
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int port, uint64_t *data)
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{
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struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
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int ret;
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int i;
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mutex_lock(&ps->stats_mutex);
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ret = mv88e6xxx_stats_snapshot(ds, port);
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if (ret < 0) {
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mutex_unlock(&ps->stats_mutex);
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return;
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}
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/*
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* Read each of the counters.
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*/
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for (i = 0; i < nr_stats; i++) {
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struct mv88e6xxx_hw_stat *s = stats + i;
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u32 low;
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u32 high;
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mv88e6xxx_stats_read(ds, s->reg, &low);
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if (s->sizeof_stat == 8)
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mv88e6xxx_stats_read(ds, s->reg + 1, &high);
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else
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high = 0;
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data[i] = (((u64)high) << 32) | low;
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}
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mutex_unlock(&ps->stats_mutex);
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}
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