1 // SPDX-License-Identifier: GPL-2.0
2 /* Microchip LAN937X switch driver main logic
3 * Copyright (C) 2019-2022 Microchip Technology Inc.
5 #include <linux/kernel.h>
6 #include <linux/module.h>
7 #include <linux/iopoll.h>
9 #include <linux/of_net.h>
10 #include <linux/if_bridge.h>
11 #include <linux/if_vlan.h>
12 #include <linux/math.h>
14 #include <net/switchdev.h>
16 #include "lan937x_reg.h"
17 #include "ksz_common.h"
20 static int lan937x_cfg(struct ksz_device *dev, u32 addr, u8 bits, bool set)
22 return regmap_update_bits(dev->regmap[0], addr, bits, set ? bits : 0);
25 static int lan937x_port_cfg(struct ksz_device *dev, int port, int offset,
28 return regmap_update_bits(dev->regmap[0], PORT_CTRL_ADDR(port, offset),
29 bits, set ? bits : 0);
32 static int lan937x_enable_spi_indirect_access(struct ksz_device *dev)
37 /* Enable Phy access through SPI */
38 ret = lan937x_cfg(dev, REG_GLOBAL_CTRL_0, SW_PHY_REG_BLOCK, false);
42 ret = ksz_read16(dev, REG_VPHY_SPECIAL_CTRL__2, &data16);
46 /* Allow SPI access */
47 data16 |= VPHY_SPI_INDIRECT_ENABLE;
49 return ksz_write16(dev, REG_VPHY_SPECIAL_CTRL__2, data16);
52 static int lan937x_vphy_ind_addr_wr(struct ksz_device *dev, int addr, int reg)
54 u16 addr_base = REG_PORT_T1_PHY_CTRL_BASE;
57 /* get register address based on the logical port */
58 temp = PORT_CTRL_ADDR(addr, (addr_base + (reg << 2)));
60 return ksz_write16(dev, REG_VPHY_IND_ADDR__2, temp);
63 static int lan937x_internal_phy_write(struct ksz_device *dev, int addr, int reg,
69 /* Check for internal phy port */
70 if (!dev->info->internal_phy[addr])
73 ret = lan937x_vphy_ind_addr_wr(dev, addr, reg);
77 /* Write the data to be written to the VPHY reg */
78 ret = ksz_write16(dev, REG_VPHY_IND_DATA__2, val);
82 /* Write the Write En and Busy bit */
83 ret = ksz_write16(dev, REG_VPHY_IND_CTRL__2,
84 (VPHY_IND_WRITE | VPHY_IND_BUSY));
88 ret = regmap_read_poll_timeout(dev->regmap[1], REG_VPHY_IND_CTRL__2,
89 value, !(value & VPHY_IND_BUSY), 10,
92 dev_err(dev->dev, "Failed to write phy register\n");
99 static int lan937x_internal_phy_read(struct ksz_device *dev, int addr, int reg,
105 /* Check for internal phy port, return 0xffff for non-existent phy */
106 if (!dev->info->internal_phy[addr])
109 ret = lan937x_vphy_ind_addr_wr(dev, addr, reg);
113 /* Write Read and Busy bit to start the transaction */
114 ret = ksz_write16(dev, REG_VPHY_IND_CTRL__2, VPHY_IND_BUSY);
118 ret = regmap_read_poll_timeout(dev->regmap[1], REG_VPHY_IND_CTRL__2,
119 value, !(value & VPHY_IND_BUSY), 10,
122 dev_err(dev->dev, "Failed to read phy register\n");
126 /* Read the VPHY register which has the PHY data */
127 return ksz_read16(dev, REG_VPHY_IND_DATA__2, val);
130 int lan937x_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data)
132 return lan937x_internal_phy_read(dev, addr, reg, data);
135 int lan937x_w_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 val)
137 return lan937x_internal_phy_write(dev, addr, reg, val);
140 int lan937x_reset_switch(struct ksz_device *dev)
146 ret = lan937x_cfg(dev, REG_SW_OPERATION, SW_RESET, true);
150 /* Enable Auto Aging */
151 ret = lan937x_cfg(dev, REG_SW_LUE_CTRL_1, SW_LINK_AUTO_AGING, true);
155 /* disable interrupts */
156 ret = ksz_write32(dev, REG_SW_INT_MASK__4, SWITCH_INT_MASK);
160 ret = ksz_write32(dev, REG_SW_INT_STATUS__4, POR_READY_INT);
164 ret = ksz_write32(dev, REG_SW_PORT_INT_MASK__4, 0xFF);
168 return ksz_read32(dev, REG_SW_PORT_INT_STATUS__4, &data32);
171 void lan937x_port_setup(struct ksz_device *dev, int port, bool cpu_port)
173 const u32 *masks = dev->info->masks;
174 const u16 *regs = dev->info->regs;
175 struct dsa_switch *ds = dev->ds;
178 /* enable tag tail for host port */
180 lan937x_port_cfg(dev, port, REG_PORT_CTRL_0,
181 PORT_TAIL_TAG_ENABLE, true);
183 /* set back pressure for half duplex */
184 lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_1, PORT_BACK_PRESSURE,
187 /* enable 802.1p priority */
188 lan937x_port_cfg(dev, port, P_PRIO_CTRL, PORT_802_1P_PRIO_ENABLE, true);
190 if (!dev->info->internal_phy[port])
191 lan937x_port_cfg(dev, port, regs[P_XMII_CTRL_0],
192 masks[P_MII_TX_FLOW_CTRL] |
193 masks[P_MII_RX_FLOW_CTRL],
197 member = dsa_user_ports(ds);
199 member = BIT(dsa_upstream_port(ds, port));
201 dev->dev_ops->cfg_port_member(dev, port, member);
204 void lan937x_config_cpu_port(struct dsa_switch *ds)
206 struct ksz_device *dev = ds->priv;
209 dsa_switch_for_each_cpu_port(dp, ds) {
210 if (dev->info->cpu_ports & (1 << dp->index)) {
211 dev->cpu_port = dp->index;
213 /* enable cpu port */
214 lan937x_port_setup(dev, dp->index, true);
218 dsa_switch_for_each_user_port(dp, ds) {
219 ksz_port_stp_state_set(ds, dp->index, BR_STATE_DISABLED);
223 int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu)
225 struct dsa_switch *ds = dev->ds;
228 new_mtu += VLAN_ETH_HLEN + ETH_FCS_LEN;
230 if (dsa_is_cpu_port(ds, port))
231 new_mtu += LAN937X_TAG_LEN;
233 if (new_mtu >= FR_MIN_SIZE)
234 ret = lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0,
235 PORT_JUMBO_PACKET, true);
237 ret = lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0,
238 PORT_JUMBO_PACKET, false);
240 dev_err(ds->dev, "failed to enable jumbo\n");
244 /* Write the frame size in PORT_MAX_FR_SIZE register */
245 ret = ksz_pwrite16(dev, port, PORT_MAX_FR_SIZE, new_mtu);
247 dev_err(ds->dev, "failed to update mtu for port %d\n", port);
254 int lan937x_set_ageing_time(struct ksz_device *dev, unsigned int msecs)
256 u32 secs = msecs / 1000;
260 value = FIELD_GET(SW_AGE_PERIOD_7_0_M, secs);
262 ret = ksz_write8(dev, REG_SW_AGE_PERIOD__1, value);
266 value = FIELD_GET(SW_AGE_PERIOD_19_8_M, secs);
268 return ksz_write16(dev, REG_SW_AGE_PERIOD__2, value);
271 static void lan937x_set_tune_adj(struct ksz_device *dev, int port,
276 ksz_pread16(dev, port, reg, &data16);
278 /* Update tune Adjust */
279 data16 |= FIELD_PREP(PORT_TUNE_ADJ, val);
280 ksz_pwrite16(dev, port, reg, data16);
282 /* write DLL reset to take effect */
283 data16 |= PORT_DLL_RESET;
284 ksz_pwrite16(dev, port, reg, data16);
287 static void lan937x_set_rgmii_tx_delay(struct ksz_device *dev, int port)
291 /* Apply different codes based on the ports as per characterization
294 val = (port == LAN937X_RGMII_1_PORT) ? RGMII_1_TX_DELAY_2NS :
295 RGMII_2_TX_DELAY_2NS;
297 lan937x_set_tune_adj(dev, port, REG_PORT_XMII_CTRL_5, val);
300 static void lan937x_set_rgmii_rx_delay(struct ksz_device *dev, int port)
304 val = (port == LAN937X_RGMII_1_PORT) ? RGMII_1_RX_DELAY_2NS :
305 RGMII_2_RX_DELAY_2NS;
307 lan937x_set_tune_adj(dev, port, REG_PORT_XMII_CTRL_4, val);
310 void lan937x_phylink_get_caps(struct ksz_device *dev, int port,
311 struct phylink_config *config)
313 config->mac_capabilities = MAC_100FD;
315 if (dev->info->supports_rgmii[port]) {
316 /* MII/RMII/RGMII ports */
317 config->mac_capabilities |= MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
318 MAC_100HD | MAC_10 | MAC_1000FD;
322 void lan937x_setup_rgmii_delay(struct ksz_device *dev, int port)
324 struct ksz_port *p = &dev->ports[port];
326 if (p->rgmii_tx_val) {
327 lan937x_set_rgmii_tx_delay(dev, port);
328 dev_info(dev->dev, "Applied rgmii tx delay for the port %d\n",
332 if (p->rgmii_rx_val) {
333 lan937x_set_rgmii_rx_delay(dev, port);
334 dev_info(dev->dev, "Applied rgmii rx delay for the port %d\n",
339 int lan937x_switch_init(struct ksz_device *dev)
341 dev->port_mask = (1 << dev->info->port_cnt) - 1;
346 int lan937x_setup(struct dsa_switch *ds)
348 struct ksz_device *dev = ds->priv;
351 /* enable Indirect Access from SPI to the VPHY registers */
352 ret = lan937x_enable_spi_indirect_access(dev);
354 dev_err(dev->dev, "failed to enable spi indirect access");
358 /* The VLAN aware is a global setting. Mixed vlan
359 * filterings are not supported.
361 ds->vlan_filtering_is_global = true;
363 /* Enable aggressive back off for half duplex & UNH mode */
364 lan937x_cfg(dev, REG_SW_MAC_CTRL_0,
365 (SW_PAUSE_UNH_MODE | SW_NEW_BACKOFF | SW_AGGR_BACKOFF),
368 /* If NO_EXC_COLLISION_DROP bit is set, the switch will not drop
369 * packets when 16 or more collisions occur
371 lan937x_cfg(dev, REG_SW_MAC_CTRL_1, NO_EXC_COLLISION_DROP, true);
373 /* enable global MIB counter freeze function */
374 lan937x_cfg(dev, REG_SW_MAC_CTRL_6, SW_MIB_COUNTER_FREEZE, true);
376 /* disable CLK125 & CLK25, 1: disable, 0: enable */
377 lan937x_cfg(dev, REG_SW_GLOBAL_OUTPUT_CTRL__1,
378 (SW_CLK125_ENB | SW_CLK25_ENB), true);
383 void lan937x_teardown(struct dsa_switch *ds)
388 void lan937x_switch_exit(struct ksz_device *dev)
390 lan937x_reset_switch(dev);
394 MODULE_DESCRIPTION("Microchip LAN937x Series Switch DSA Driver");
395 MODULE_LICENSE("GPL");