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