405 lines
9.7 KiB
C
405 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Microchip LAN937X switch driver main logic
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* Copyright (C) 2019-2022 Microchip Technology Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/iopoll.h>
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#include <linux/phy.h>
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#include <linux/of_net.h>
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#include <linux/if_bridge.h>
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#include <linux/if_vlan.h>
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#include <linux/math.h>
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#include <net/dsa.h>
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#include <net/switchdev.h>
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#include "lan937x_reg.h"
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#include "ksz_common.h"
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#include "ksz9477.h"
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#include "lan937x.h"
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static int lan937x_cfg(struct ksz_device *dev, u32 addr, u8 bits, bool set)
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{
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return regmap_update_bits(dev->regmap[0], addr, bits, set ? bits : 0);
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}
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static int lan937x_port_cfg(struct ksz_device *dev, int port, int offset,
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u8 bits, bool set)
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{
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return regmap_update_bits(dev->regmap[0], PORT_CTRL_ADDR(port, offset),
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bits, set ? bits : 0);
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}
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static int lan937x_enable_spi_indirect_access(struct ksz_device *dev)
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{
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u16 data16;
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int ret;
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/* Enable Phy access through SPI */
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ret = lan937x_cfg(dev, REG_GLOBAL_CTRL_0, SW_PHY_REG_BLOCK, false);
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if (ret < 0)
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return ret;
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ret = ksz_read16(dev, REG_VPHY_SPECIAL_CTRL__2, &data16);
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if (ret < 0)
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return ret;
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/* Allow SPI access */
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data16 |= VPHY_SPI_INDIRECT_ENABLE;
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return ksz_write16(dev, REG_VPHY_SPECIAL_CTRL__2, data16);
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}
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static int lan937x_vphy_ind_addr_wr(struct ksz_device *dev, int addr, int reg)
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{
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u16 addr_base = REG_PORT_T1_PHY_CTRL_BASE;
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u16 temp;
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/* get register address based on the logical port */
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temp = PORT_CTRL_ADDR(addr, (addr_base + (reg << 2)));
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return ksz_write16(dev, REG_VPHY_IND_ADDR__2, temp);
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}
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static int lan937x_internal_phy_write(struct ksz_device *dev, int addr, int reg,
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u16 val)
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{
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unsigned int value;
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int ret;
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/* Check for internal phy port */
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if (!dev->info->internal_phy[addr])
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return -EOPNOTSUPP;
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ret = lan937x_vphy_ind_addr_wr(dev, addr, reg);
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if (ret < 0)
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return ret;
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/* Write the data to be written to the VPHY reg */
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ret = ksz_write16(dev, REG_VPHY_IND_DATA__2, val);
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if (ret < 0)
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return ret;
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/* Write the Write En and Busy bit */
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ret = ksz_write16(dev, REG_VPHY_IND_CTRL__2,
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(VPHY_IND_WRITE | VPHY_IND_BUSY));
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if (ret < 0)
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return ret;
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ret = regmap_read_poll_timeout(dev->regmap[1], REG_VPHY_IND_CTRL__2,
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value, !(value & VPHY_IND_BUSY), 10,
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1000);
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if (ret < 0) {
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dev_err(dev->dev, "Failed to write phy register\n");
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return ret;
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}
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return 0;
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}
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static int lan937x_internal_phy_read(struct ksz_device *dev, int addr, int reg,
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u16 *val)
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{
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unsigned int value;
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int ret;
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/* Check for internal phy port, return 0xffff for non-existent phy */
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if (!dev->info->internal_phy[addr])
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return 0xffff;
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ret = lan937x_vphy_ind_addr_wr(dev, addr, reg);
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if (ret < 0)
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return ret;
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/* Write Read and Busy bit to start the transaction */
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ret = ksz_write16(dev, REG_VPHY_IND_CTRL__2, VPHY_IND_BUSY);
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if (ret < 0)
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return ret;
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ret = regmap_read_poll_timeout(dev->regmap[1], REG_VPHY_IND_CTRL__2,
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value, !(value & VPHY_IND_BUSY), 10,
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1000);
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if (ret < 0) {
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dev_err(dev->dev, "Failed to read phy register\n");
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return ret;
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}
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/* Read the VPHY register which has the PHY data */
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return ksz_read16(dev, REG_VPHY_IND_DATA__2, val);
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}
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int lan937x_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data)
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{
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return lan937x_internal_phy_read(dev, addr, reg, data);
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}
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int lan937x_w_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 val)
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{
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return lan937x_internal_phy_write(dev, addr, reg, val);
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}
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int lan937x_reset_switch(struct ksz_device *dev)
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{
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u32 data32;
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int ret;
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/* reset switch */
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ret = lan937x_cfg(dev, REG_SW_OPERATION, SW_RESET, true);
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if (ret < 0)
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return ret;
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/* Enable Auto Aging */
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ret = lan937x_cfg(dev, REG_SW_LUE_CTRL_1, SW_LINK_AUTO_AGING, true);
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if (ret < 0)
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return ret;
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/* disable interrupts */
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ret = ksz_write32(dev, REG_SW_INT_MASK__4, SWITCH_INT_MASK);
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if (ret < 0)
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return ret;
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ret = ksz_write32(dev, REG_SW_INT_STATUS__4, POR_READY_INT);
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if (ret < 0)
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return ret;
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ret = ksz_write32(dev, REG_SW_PORT_INT_MASK__4, 0xFF);
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if (ret < 0)
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return ret;
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return ksz_read32(dev, REG_SW_PORT_INT_STATUS__4, &data32);
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}
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void lan937x_port_setup(struct ksz_device *dev, int port, bool cpu_port)
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{
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const u32 *masks = dev->info->masks;
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const u16 *regs = dev->info->regs;
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struct dsa_switch *ds = dev->ds;
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u8 member;
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/* enable tag tail for host port */
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if (cpu_port)
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lan937x_port_cfg(dev, port, REG_PORT_CTRL_0,
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PORT_TAIL_TAG_ENABLE, true);
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/* Enable the Port Queue split */
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ksz9477_port_queue_split(dev, port);
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/* set back pressure for half duplex */
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lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_1, PORT_BACK_PRESSURE,
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true);
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/* enable 802.1p priority */
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lan937x_port_cfg(dev, port, P_PRIO_CTRL, PORT_802_1P_PRIO_ENABLE, true);
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if (!dev->info->internal_phy[port])
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lan937x_port_cfg(dev, port, regs[P_XMII_CTRL_0],
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masks[P_MII_TX_FLOW_CTRL] |
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masks[P_MII_RX_FLOW_CTRL],
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true);
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if (cpu_port)
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member = dsa_user_ports(ds);
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else
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member = BIT(dsa_upstream_port(ds, port));
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dev->dev_ops->cfg_port_member(dev, port, member);
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}
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void lan937x_config_cpu_port(struct dsa_switch *ds)
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{
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struct ksz_device *dev = ds->priv;
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struct dsa_port *dp;
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dsa_switch_for_each_cpu_port(dp, ds) {
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if (dev->info->cpu_ports & (1 << dp->index)) {
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dev->cpu_port = dp->index;
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/* enable cpu port */
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lan937x_port_setup(dev, dp->index, true);
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}
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}
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dsa_switch_for_each_user_port(dp, ds) {
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ksz_port_stp_state_set(ds, dp->index, BR_STATE_DISABLED);
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}
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}
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int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu)
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{
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struct dsa_switch *ds = dev->ds;
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int ret;
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new_mtu += VLAN_ETH_HLEN + ETH_FCS_LEN;
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if (dsa_is_cpu_port(ds, port))
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new_mtu += LAN937X_TAG_LEN;
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if (new_mtu >= FR_MIN_SIZE)
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ret = lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0,
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PORT_JUMBO_PACKET, true);
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else
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ret = lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0,
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PORT_JUMBO_PACKET, false);
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if (ret < 0) {
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dev_err(ds->dev, "failed to enable jumbo\n");
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return ret;
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}
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/* Write the frame size in PORT_MAX_FR_SIZE register */
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ret = ksz_pwrite16(dev, port, PORT_MAX_FR_SIZE, new_mtu);
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if (ret) {
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dev_err(ds->dev, "failed to update mtu for port %d\n", port);
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return ret;
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}
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return 0;
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}
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int lan937x_set_ageing_time(struct ksz_device *dev, unsigned int msecs)
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{
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u32 secs = msecs / 1000;
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u32 value;
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int ret;
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value = FIELD_GET(SW_AGE_PERIOD_7_0_M, secs);
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ret = ksz_write8(dev, REG_SW_AGE_PERIOD__1, value);
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if (ret < 0)
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return ret;
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value = FIELD_GET(SW_AGE_PERIOD_19_8_M, secs);
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return ksz_write16(dev, REG_SW_AGE_PERIOD__2, value);
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}
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static void lan937x_set_tune_adj(struct ksz_device *dev, int port,
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u16 reg, u8 val)
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{
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u16 data16;
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ksz_pread16(dev, port, reg, &data16);
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/* Update tune Adjust */
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data16 |= FIELD_PREP(PORT_TUNE_ADJ, val);
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ksz_pwrite16(dev, port, reg, data16);
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/* write DLL reset to take effect */
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data16 |= PORT_DLL_RESET;
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ksz_pwrite16(dev, port, reg, data16);
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}
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static void lan937x_set_rgmii_tx_delay(struct ksz_device *dev, int port)
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{
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u8 val;
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/* Apply different codes based on the ports as per characterization
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* results
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*/
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val = (port == LAN937X_RGMII_1_PORT) ? RGMII_1_TX_DELAY_2NS :
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RGMII_2_TX_DELAY_2NS;
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lan937x_set_tune_adj(dev, port, REG_PORT_XMII_CTRL_5, val);
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}
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static void lan937x_set_rgmii_rx_delay(struct ksz_device *dev, int port)
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{
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u8 val;
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val = (port == LAN937X_RGMII_1_PORT) ? RGMII_1_RX_DELAY_2NS :
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RGMII_2_RX_DELAY_2NS;
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lan937x_set_tune_adj(dev, port, REG_PORT_XMII_CTRL_4, val);
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}
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void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
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struct phylink_config *config)
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{
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config->mac_capabilities = MAC_100FD;
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if (dev->info->supports_rgmii[port]) {
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/* MII/RMII/RGMII ports */
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config->mac_capabilities |= MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
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MAC_100HD | MAC_10 | MAC_1000FD;
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}
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}
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void lan937x_setup_rgmii_delay(struct ksz_device *dev, int port)
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{
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struct ksz_port *p = &dev->ports[port];
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if (p->rgmii_tx_val) {
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lan937x_set_rgmii_tx_delay(dev, port);
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dev_info(dev->dev, "Applied rgmii tx delay for the port %d\n",
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port);
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}
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if (p->rgmii_rx_val) {
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lan937x_set_rgmii_rx_delay(dev, port);
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dev_info(dev->dev, "Applied rgmii rx delay for the port %d\n",
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port);
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}
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}
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int lan937x_tc_cbs_set_cinc(struct ksz_device *dev, int port, u32 val)
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{
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return ksz_pwrite32(dev, port, REG_PORT_MTI_CREDIT_INCREMENT, val);
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}
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int lan937x_switch_init(struct ksz_device *dev)
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{
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dev->port_mask = (1 << dev->info->port_cnt) - 1;
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return 0;
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}
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int lan937x_setup(struct dsa_switch *ds)
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{
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struct ksz_device *dev = ds->priv;
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int ret;
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/* enable Indirect Access from SPI to the VPHY registers */
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ret = lan937x_enable_spi_indirect_access(dev);
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if (ret < 0) {
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dev_err(dev->dev, "failed to enable spi indirect access");
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return ret;
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}
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/* The VLAN aware is a global setting. Mixed vlan
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* filterings are not supported.
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*/
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ds->vlan_filtering_is_global = true;
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/* Enable aggressive back off for half duplex & UNH mode */
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lan937x_cfg(dev, REG_SW_MAC_CTRL_0,
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(SW_PAUSE_UNH_MODE | SW_NEW_BACKOFF | SW_AGGR_BACKOFF),
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true);
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/* If NO_EXC_COLLISION_DROP bit is set, the switch will not drop
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* packets when 16 or more collisions occur
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*/
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lan937x_cfg(dev, REG_SW_MAC_CTRL_1, NO_EXC_COLLISION_DROP, true);
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/* enable global MIB counter freeze function */
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lan937x_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, true);
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/* disable CLK125 & CLK25, 1: disable, 0: enable */
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lan937x_cfg(dev, REG_SW_GLOBAL_OUTPUT_CTRL__1,
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(SW_CLK125_ENB | SW_CLK25_ENB), true);
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return 0;
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}
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void lan937x_teardown(struct dsa_switch *ds)
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{
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}
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void lan937x_switch_exit(struct ksz_device *dev)
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{
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lan937x_reset_switch(dev);
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}
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MODULE_AUTHOR("Arun Ramadoss <arun.ramadoss@microchip.com>");
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MODULE_DESCRIPTION("Microchip LAN937x Series Switch DSA Driver");
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MODULE_LICENSE("GPL");
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