352 lines
8.5 KiB
C
352 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for ICPlus PHYs
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*
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/unistd.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/mii.h>
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#include <linux/ethtool.h>
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#include <linux/phy.h>
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#include <linux/property.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <linux/uaccess.h>
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MODULE_DESCRIPTION("ICPlus IP175C/IP101A/IP101G/IC1001 PHY drivers");
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MODULE_AUTHOR("Michael Barkowski");
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MODULE_LICENSE("GPL");
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/* IP101A/G - IP1001 */
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#define IP10XX_SPEC_CTRL_STATUS 16 /* Spec. Control Register */
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#define IP1001_RXPHASE_SEL BIT(0) /* Add delay on RX_CLK */
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#define IP1001_TXPHASE_SEL BIT(1) /* Add delay on TX_CLK */
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#define IP1001_SPEC_CTRL_STATUS_2 20 /* IP1001 Spec. Control Reg 2 */
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#define IP1001_APS_ON 11 /* IP1001 APS Mode bit */
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#define IP101A_G_APS_ON BIT(1) /* IP101A/G APS Mode bit */
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#define IP101A_G_IRQ_CONF_STATUS 0x11 /* Conf Info IRQ & Status Reg */
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#define IP101A_G_IRQ_PIN_USED BIT(15) /* INTR pin used */
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#define IP101A_G_IRQ_ALL_MASK BIT(11) /* IRQ's inactive */
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#define IP101A_G_IRQ_SPEED_CHANGE BIT(2)
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#define IP101A_G_IRQ_DUPLEX_CHANGE BIT(1)
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#define IP101A_G_IRQ_LINK_CHANGE BIT(0)
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#define IP101G_DIGITAL_IO_SPEC_CTRL 0x1d
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#define IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32 BIT(2)
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/* The 32-pin IP101GR package can re-configure the mode of the RXER/INTR_32 pin
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* (pin number 21). The hardware default is RXER (receive error) mode. But it
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* can be configured to interrupt mode manually.
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*/
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enum ip101gr_sel_intr32 {
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IP101GR_SEL_INTR32_KEEP,
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IP101GR_SEL_INTR32_INTR,
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IP101GR_SEL_INTR32_RXER,
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};
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struct ip101a_g_phy_priv {
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enum ip101gr_sel_intr32 sel_intr32;
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};
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static int ip175c_config_init(struct phy_device *phydev)
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{
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int err, i;
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static int full_reset_performed;
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if (full_reset_performed == 0) {
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/* master reset */
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err = mdiobus_write(phydev->mdio.bus, 30, 0, 0x175c);
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if (err < 0)
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return err;
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/* ensure no bus delays overlap reset period */
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err = mdiobus_read(phydev->mdio.bus, 30, 0);
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/* data sheet specifies reset period is 2 msec */
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mdelay(2);
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/* enable IP175C mode */
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err = mdiobus_write(phydev->mdio.bus, 29, 31, 0x175c);
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if (err < 0)
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return err;
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/* Set MII0 speed and duplex (in PHY mode) */
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err = mdiobus_write(phydev->mdio.bus, 29, 22, 0x420);
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if (err < 0)
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return err;
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/* reset switch ports */
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for (i = 0; i < 5; i++) {
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err = mdiobus_write(phydev->mdio.bus, i,
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MII_BMCR, BMCR_RESET);
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if (err < 0)
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return err;
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}
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for (i = 0; i < 5; i++)
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err = mdiobus_read(phydev->mdio.bus, i, MII_BMCR);
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mdelay(2);
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full_reset_performed = 1;
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}
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if (phydev->mdio.addr != 4) {
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phydev->state = PHY_RUNNING;
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phydev->speed = SPEED_100;
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phydev->duplex = DUPLEX_FULL;
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phydev->link = 1;
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netif_carrier_on(phydev->attached_dev);
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}
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return 0;
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}
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static int ip1xx_reset(struct phy_device *phydev)
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{
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int bmcr;
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/* Software Reset PHY */
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bmcr = phy_read(phydev, MII_BMCR);
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if (bmcr < 0)
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return bmcr;
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bmcr |= BMCR_RESET;
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bmcr = phy_write(phydev, MII_BMCR, bmcr);
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if (bmcr < 0)
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return bmcr;
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do {
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bmcr = phy_read(phydev, MII_BMCR);
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if (bmcr < 0)
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return bmcr;
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} while (bmcr & BMCR_RESET);
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return 0;
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}
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static int ip1001_config_init(struct phy_device *phydev)
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{
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int c;
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c = ip1xx_reset(phydev);
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if (c < 0)
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return c;
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/* Enable Auto Power Saving mode */
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c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
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if (c < 0)
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return c;
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c |= IP1001_APS_ON;
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c = phy_write(phydev, IP1001_SPEC_CTRL_STATUS_2, c);
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if (c < 0)
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return c;
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if (phy_interface_is_rgmii(phydev)) {
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c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
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if (c < 0)
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return c;
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c &= ~(IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
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if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
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c |= (IP1001_RXPHASE_SEL | IP1001_TXPHASE_SEL);
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else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
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c |= IP1001_RXPHASE_SEL;
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else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
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c |= IP1001_TXPHASE_SEL;
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c = phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
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if (c < 0)
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return c;
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}
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return 0;
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}
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static int ip175c_read_status(struct phy_device *phydev)
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{
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if (phydev->mdio.addr == 4) /* WAN port */
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genphy_read_status(phydev);
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else
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/* Don't need to read status for switch ports */
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phydev->irq = PHY_IGNORE_INTERRUPT;
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return 0;
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}
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static int ip175c_config_aneg(struct phy_device *phydev)
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{
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if (phydev->mdio.addr == 4) /* WAN port */
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genphy_config_aneg(phydev);
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return 0;
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}
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static int ip101a_g_probe(struct phy_device *phydev)
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{
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struct device *dev = &phydev->mdio.dev;
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struct ip101a_g_phy_priv *priv;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/* Both functions (RX error and interrupt status) are sharing the same
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* pin on the 32-pin IP101GR, so this is an exclusive choice.
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*/
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if (device_property_read_bool(dev, "icplus,select-rx-error") &&
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device_property_read_bool(dev, "icplus,select-interrupt")) {
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dev_err(dev,
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"RXER and INTR mode cannot be selected together\n");
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return -EINVAL;
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}
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if (device_property_read_bool(dev, "icplus,select-rx-error"))
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priv->sel_intr32 = IP101GR_SEL_INTR32_RXER;
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else if (device_property_read_bool(dev, "icplus,select-interrupt"))
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priv->sel_intr32 = IP101GR_SEL_INTR32_INTR;
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else
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priv->sel_intr32 = IP101GR_SEL_INTR32_KEEP;
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phydev->priv = priv;
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return 0;
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}
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static int ip101a_g_config_init(struct phy_device *phydev)
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{
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struct ip101a_g_phy_priv *priv = phydev->priv;
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int err, c;
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c = ip1xx_reset(phydev);
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if (c < 0)
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return c;
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/* configure the RXER/INTR_32 pin of the 32-pin IP101GR if needed: */
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switch (priv->sel_intr32) {
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case IP101GR_SEL_INTR32_RXER:
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err = phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
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IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32, 0);
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if (err < 0)
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return err;
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break;
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case IP101GR_SEL_INTR32_INTR:
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err = phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
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IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32,
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IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32);
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if (err < 0)
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return err;
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break;
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default:
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/* Don't touch IP101G_DIGITAL_IO_SPEC_CTRL because it's not
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* documented on IP101A and it's not clear whether this would
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* cause problems.
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* For the 32-pin IP101GR we simply keep the SEL_INTR32
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* configuration as set by the bootloader when not configured
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* to one of the special functions.
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*/
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break;
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}
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/* Enable Auto Power Saving mode */
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c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
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c |= IP101A_G_APS_ON;
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return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
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}
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static int ip101a_g_config_intr(struct phy_device *phydev)
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{
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u16 val;
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
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/* INTR pin used: Speed/link/duplex will cause an interrupt */
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val = IP101A_G_IRQ_PIN_USED;
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else
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val = IP101A_G_IRQ_ALL_MASK;
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return phy_write(phydev, IP101A_G_IRQ_CONF_STATUS, val);
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}
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static int ip101a_g_did_interrupt(struct phy_device *phydev)
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{
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int val = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
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if (val < 0)
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return 0;
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return val & (IP101A_G_IRQ_SPEED_CHANGE |
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IP101A_G_IRQ_DUPLEX_CHANGE |
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IP101A_G_IRQ_LINK_CHANGE);
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}
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static int ip101a_g_ack_interrupt(struct phy_device *phydev)
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{
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int err = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
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if (err < 0)
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return err;
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return 0;
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}
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static struct phy_driver icplus_driver[] = {
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{
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.phy_id = 0x02430d80,
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.name = "ICPlus IP175C",
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.phy_id_mask = 0x0ffffff0,
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/* PHY_BASIC_FEATURES */
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.config_init = &ip175c_config_init,
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.config_aneg = &ip175c_config_aneg,
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.read_status = &ip175c_read_status,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x02430d90,
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.name = "ICPlus IP1001",
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.phy_id_mask = 0x0ffffff0,
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/* PHY_GBIT_FEATURES */
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.config_init = &ip1001_config_init,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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}, {
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.phy_id = 0x02430c54,
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.name = "ICPlus IP101A/G",
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.phy_id_mask = 0x0ffffff0,
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/* PHY_BASIC_FEATURES */
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.probe = ip101a_g_probe,
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.config_intr = ip101a_g_config_intr,
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.did_interrupt = ip101a_g_did_interrupt,
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.ack_interrupt = ip101a_g_ack_interrupt,
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.config_init = &ip101a_g_config_init,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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} };
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module_phy_driver(icplus_driver);
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static struct mdio_device_id __maybe_unused icplus_tbl[] = {
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{ 0x02430d80, 0x0ffffff0 },
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{ 0x02430d90, 0x0ffffff0 },
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{ 0x02430c54, 0x0ffffff0 },
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{ }
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};
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MODULE_DEVICE_TABLE(mdio, icplus_tbl);
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