diff options
Diffstat (limited to 'drivers/net/phy/mscc.c')
| -rw-r--r-- | drivers/net/phy/mscc.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c new file mode 100644 index 000000000000..a17573e3bd8a --- /dev/null +++ b/drivers/net/phy/mscc.c @@ -0,0 +1,337 @@ +/* + * Driver for Microsemi VSC85xx PHYs + * + * Author: Nagaraju Lakkaraju + * License: Dual MIT/GPL + * Copyright (c) 2016 Microsemi Corporation + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mdio.h> +#include <linux/mii.h> +#include <linux/phy.h> +#include <linux/of.h> +#include <dt-bindings/net/mscc-phy-vsc8531.h> + +enum rgmii_rx_clock_delay { + RGMII_RX_CLK_DELAY_0_2_NS = 0, + RGMII_RX_CLK_DELAY_0_8_NS = 1, + RGMII_RX_CLK_DELAY_1_1_NS = 2, + RGMII_RX_CLK_DELAY_1_7_NS = 3, + RGMII_RX_CLK_DELAY_2_0_NS = 4, + RGMII_RX_CLK_DELAY_2_3_NS = 5, + RGMII_RX_CLK_DELAY_2_6_NS = 6, + RGMII_RX_CLK_DELAY_3_4_NS = 7 +}; + +/* Microsemi VSC85xx PHY registers */ +/* IEEE 802. Std Registers */ +#define MSCC_PHY_EXT_PHY_CNTL_1 23 +#define MAC_IF_SELECTION_MASK 0x1800 +#define MAC_IF_SELECTION_GMII 0 +#define MAC_IF_SELECTION_RMII 1 +#define MAC_IF_SELECTION_RGMII 2 +#define MAC_IF_SELECTION_POS 11 +#define FAR_END_LOOPBACK_MODE_MASK 0x0008 + +#define MII_VSC85XX_INT_MASK 25 +#define MII_VSC85XX_INT_MASK_MASK 0xa000 +#define MII_VSC85XX_INT_STATUS 26 + +#define MSCC_PHY_WOL_MAC_CONTROL 27 +#define EDGE_RATE_CNTL_POS 5 +#define EDGE_RATE_CNTL_MASK 0x00E0 + +#define MSCC_EXT_PAGE_ACCESS 31 +#define MSCC_PHY_PAGE_STANDARD 0x0000 /* Standard registers */ +#define MSCC_PHY_PAGE_EXTENDED_2 0x0002 /* Extended reg - page 2 */ + +/* Extended Page 2 Registers */ +#define MSCC_PHY_RGMII_CNTL 20 +#define RGMII_RX_CLK_DELAY_MASK 0x0070 +#define RGMII_RX_CLK_DELAY_POS 4 + +/* Microsemi PHY ID's */ +#define PHY_ID_VSC8531 0x00070570 +#define PHY_ID_VSC8541 0x00070770 + +struct edge_rate_table { + u16 vddmac; + int slowdown[MSCC_SLOWDOWN_MAX]; +}; + +struct edge_rate_table edge_table[MSCC_VDDMAC_MAX] = { + {3300, { 0, -2, -4, -7, -10, -17, -29, -53} }, + {2500, { 0, -3, -6, -10, -14, -23, -37, -63} }, + {1800, { 0, -5, -9, -16, -23, -35, -52, -76} }, + {1500, { 0, -6, -14, -21, -29, -42, -58, -77} }, +}; + +struct vsc8531_private { + u8 edge_slowdown; + u16 vddmac; +}; + +static int vsc85xx_phy_page_set(struct phy_device *phydev, u8 page) +{ + int rc; + + rc = phy_write(phydev, MSCC_EXT_PAGE_ACCESS, page); + return rc; +} + +static u8 edge_rate_magic_get(u16 vddmac, + int slowdown) +{ + int rc = (MSCC_SLOWDOWN_MAX - 1); + u8 vdd; + u8 sd; + + for (vdd = 0; vdd < MSCC_VDDMAC_MAX; vdd++) { + if (edge_table[vdd].vddmac == vddmac) { + for (sd = 0; sd < MSCC_SLOWDOWN_MAX; sd++) { + if (edge_table[vdd].slowdown[sd] <= slowdown) { + rc = (MSCC_SLOWDOWN_MAX - sd - 1); + break; + } + } + } + } + + return rc; +} + +static int vsc85xx_edge_rate_cntl_set(struct phy_device *phydev, + u8 edge_rate) +{ + int rc; + u16 reg_val; + + mutex_lock(&phydev->lock); + rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED_2); + if (rc != 0) + goto out_unlock; + reg_val = phy_read(phydev, MSCC_PHY_WOL_MAC_CONTROL); + reg_val &= ~(EDGE_RATE_CNTL_MASK); + reg_val |= (edge_rate << EDGE_RATE_CNTL_POS); + rc = phy_write(phydev, MSCC_PHY_WOL_MAC_CONTROL, reg_val); + if (rc != 0) + goto out_unlock; + rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD); + +out_unlock: + mutex_unlock(&phydev->lock); + + return rc; +} + +static int vsc85xx_mac_if_set(struct phy_device *phydev, + phy_interface_t interface) +{ + int rc; + u16 reg_val; + + mutex_lock(&phydev->lock); + reg_val = phy_read(phydev, MSCC_PHY_EXT_PHY_CNTL_1); + reg_val &= ~(MAC_IF_SELECTION_MASK); + switch (interface) { + case PHY_INTERFACE_MODE_RGMII: + reg_val |= (MAC_IF_SELECTION_RGMII << MAC_IF_SELECTION_POS); + break; + case PHY_INTERFACE_MODE_RMII: + reg_val |= (MAC_IF_SELECTION_RMII << MAC_IF_SELECTION_POS); + break; + case PHY_INTERFACE_MODE_MII: + case PHY_INTERFACE_MODE_GMII: + reg_val |= (MAC_IF_SELECTION_GMII << MAC_IF_SELECTION_POS); + break; + default: + rc = -EINVAL; + goto out_unlock; + } + rc = phy_write(phydev, MSCC_PHY_EXT_PHY_CNTL_1, reg_val); + if (rc != 0) + goto out_unlock; + + rc = genphy_soft_reset(phydev); + +out_unlock: + mutex_unlock(&phydev->lock); + + return rc; +} + +static int vsc85xx_default_config(struct phy_device *phydev) +{ + int rc; + u16 reg_val; + + mutex_lock(&phydev->lock); + rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_EXTENDED_2); + if (rc != 0) + goto out_unlock; + + reg_val = phy_read(phydev, MSCC_PHY_RGMII_CNTL); + reg_val &= ~(RGMII_RX_CLK_DELAY_MASK); + reg_val |= (RGMII_RX_CLK_DELAY_1_1_NS << RGMII_RX_CLK_DELAY_POS); + phy_write(phydev, MSCC_PHY_RGMII_CNTL, reg_val); + rc = vsc85xx_phy_page_set(phydev, MSCC_PHY_PAGE_STANDARD); + +out_unlock: + mutex_unlock(&phydev->lock); + + return rc; +} + +#ifdef CONFIG_OF_MDIO +static int vsc8531_of_init(struct phy_device *phydev) +{ + int rc; + struct vsc8531_private *vsc8531 = phydev->priv; + struct device *dev = &phydev->mdio.dev; + struct device_node *of_node = dev->of_node; + + if (!of_node) + return -ENODEV; + + rc = of_property_read_u16(of_node, "vsc8531,vddmac", + &vsc8531->vddmac); + if (rc == -EINVAL) + vsc8531->vddmac = MSCC_VDDMAC_3300; + rc = of_property_read_u8(of_node, "vsc8531,edge-slowdown", + &vsc8531->edge_slowdown); + if (rc == -EINVAL) + vsc8531->edge_slowdown = 0; + + rc = 0; + return rc; +} +#else +static int vsc8531_of_init(struct phy_device *phydev) +{ + return 0; +} +#endif /* CONFIG_OF_MDIO */ + +static int vsc85xx_config_init(struct phy_device *phydev) +{ + int rc; + struct vsc8531_private *vsc8531 = phydev->priv; + u8 edge_rate; + + rc = vsc8531_of_init(phydev); + if (rc) + return rc; + + rc = vsc85xx_default_config(phydev); + if (rc) + return rc; + + rc = vsc85xx_mac_if_set(phydev, phydev->interface); + if (rc) + return rc; + + edge_rate = edge_rate_magic_get(vsc8531->vddmac, + -(int)vsc8531->edge_slowdown); + rc = vsc85xx_edge_rate_cntl_set(phydev, edge_rate); + if (rc) + return rc; + + rc = genphy_config_init(phydev); + + return rc; +} + +static int vsc85xx_ack_interrupt(struct phy_device *phydev) +{ + int rc = 0; + + if (phydev->interrupts == PHY_INTERRUPT_ENABLED) + rc = phy_read(phydev, MII_VSC85XX_INT_STATUS); + + return (rc < 0) ? rc : 0; +} + +static int vsc85xx_config_intr(struct phy_device *phydev) +{ + int rc; + + if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { + rc = phy_write(phydev, MII_VSC85XX_INT_MASK, + MII_VSC85XX_INT_MASK_MASK); + } else { + rc = phy_write(phydev, MII_VSC85XX_INT_MASK, 0); + if (rc < 0) + return rc; + rc = phy_read(phydev, MII_VSC85XX_INT_STATUS); + } + + return rc; +} + +static int vsc85xx_probe(struct phy_device *phydev) +{ + struct vsc8531_private *vsc8531; + + vsc8531 = devm_kzalloc(&phydev->mdio.dev, sizeof(*vsc8531), GFP_KERNEL); + if (!vsc8531) + return -ENOMEM; + + phydev->priv = vsc8531; + + return 0; +} + +/* Microsemi VSC85xx PHYs */ +static struct phy_driver vsc85xx_driver[] = { +{ + .phy_id = PHY_ID_VSC8531, + .name = "Microsemi VSC8531", + .phy_id_mask = 0xfffffff0, + .features = PHY_GBIT_FEATURES, + .flags = PHY_HAS_INTERRUPT, + .soft_reset = &genphy_soft_reset, + .config_init = &vsc85xx_config_init, + .config_aneg = &genphy_config_aneg, + .aneg_done = &genphy_aneg_done, + .read_status = &genphy_read_status, + .ack_interrupt = &vsc85xx_ack_interrupt, + .config_intr = &vsc85xx_config_intr, + .suspend = &genphy_suspend, + .resume = &genphy_resume, + .probe = &vsc85xx_probe, +}, +{ + .phy_id = PHY_ID_VSC8541, + .name = "Microsemi VSC8541 SyncE", + .phy_id_mask = 0xfffffff0, + .features = PHY_GBIT_FEATURES, + .flags = PHY_HAS_INTERRUPT, + .soft_reset = &genphy_soft_reset, + .config_init = &vsc85xx_config_init, + .config_aneg = &genphy_config_aneg, + .aneg_done = &genphy_aneg_done, + .read_status = &genphy_read_status, + .ack_interrupt = &vsc85xx_ack_interrupt, + .config_intr = &vsc85xx_config_intr, + .suspend = &genphy_suspend, + .resume = &genphy_resume, + .probe = &vsc85xx_probe, +} + +}; + +module_phy_driver(vsc85xx_driver); + +static struct mdio_device_id __maybe_unused vsc85xx_tbl[] = { + { PHY_ID_VSC8531, 0xfffffff0, }, + { PHY_ID_VSC8541, 0xfffffff0, }, + { } +}; + +MODULE_DEVICE_TABLE(mdio, vsc85xx_tbl); + +MODULE_DESCRIPTION("Microsemi VSC85xx PHY driver"); +MODULE_AUTHOR("Nagaraju Lakkaraju"); +MODULE_LICENSE("Dual MIT/GPL"); |