/* * QorIQ 10G MDIO Controller * * Copyright 2012 Freescale Semiconductor, Inc. * * Authors: Andy Fleming * Timur Tabi * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ #include #include #include #include #include #include #include #include #include /* Number of microseconds to wait for a register to respond */ #define TIMEOUT 1000 struct tgec_mdio_controller { __be32 reserved[12]; __be32 mdio_stat; /* MDIO configuration and status */ __be32 mdio_ctl; /* MDIO control */ __be32 mdio_data; /* MDIO data */ __be32 mdio_addr; /* MDIO address */ } __packed; #define MDIO_STAT_ENC BIT(6) #define MDIO_STAT_CLKDIV(x) (((x>>1) & 0xff) << 8) #define MDIO_STAT_BSY BIT(0) #define MDIO_STAT_RD_ER BIT(1) #define MDIO_CTL_DEV_ADDR(x) (x & 0x1f) #define MDIO_CTL_PORT_ADDR(x) ((x & 0x1f) << 5) #define MDIO_CTL_PRE_DIS BIT(10) #define MDIO_CTL_SCAN_EN BIT(11) #define MDIO_CTL_POST_INC BIT(14) #define MDIO_CTL_READ BIT(15) #define MDIO_DATA(x) (x & 0xffff) #define MDIO_DATA_BSY BIT(31) struct mdio_fsl_priv { struct tgec_mdio_controller __iomem *mdio_base; bool is_little_endian; }; static u32 xgmac_read32(void __iomem *regs, bool is_little_endian) { if (is_little_endian) return ioread32(regs); else return ioread32be(regs); } static void xgmac_write32(u32 value, void __iomem *regs, bool is_little_endian) { if (is_little_endian) iowrite32(value, regs); else iowrite32be(value, regs); } /* * Wait until the MDIO bus is free */ static int xgmac_wait_until_free(struct device *dev, struct tgec_mdio_controller __iomem *regs, bool is_little_endian) { unsigned int timeout; /* Wait till the bus is free */ timeout = TIMEOUT; while ((xgmac_read32(®s->mdio_stat, is_little_endian) & MDIO_STAT_BSY) && timeout) { cpu_relax(); timeout--; } if (!timeout) { dev_err(dev, "timeout waiting for bus to be free\n"); return -ETIMEDOUT; } return 0; } /* * Wait till the MDIO read or write operation is complete */ static int xgmac_wait_until_done(struct device *dev, struct tgec_mdio_controller __iomem *regs, bool is_little_endian) { unsigned int timeout; /* Wait till the MDIO write is complete */ timeout = TIMEOUT; while ((xgmac_read32(®s->mdio_stat, is_little_endian) & MDIO_STAT_BSY) && timeout) { cpu_relax(); timeout--; } if (!timeout) { dev_err(dev, "timeout waiting for operation to complete\n"); return -ETIMEDOUT; } return 0; } /* * Write value to the PHY for this device to the register at regnum,waiting * until the write is done before it returns. All PHY configuration has to be * done through the TSEC1 MIIM regs. */ static int xgmac_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 value) { struct mdio_fsl_priv *priv = (struct mdio_fsl_priv *)bus->priv; struct tgec_mdio_controller __iomem *regs = priv->mdio_base; uint16_t dev_addr; u32 mdio_ctl, mdio_stat; int ret; bool endian = priv->is_little_endian; mdio_stat = xgmac_read32(®s->mdio_stat, endian); if (regnum & MII_ADDR_C45) { /* Clause 45 (ie 10G) */ dev_addr = (regnum >> 16) & 0x1f; mdio_stat |= MDIO_STAT_ENC; } else { /* Clause 22 (ie 1G) */ dev_addr = regnum & 0x1f; mdio_stat &= ~MDIO_STAT_ENC; } xgmac_write32(mdio_stat, ®s->mdio_stat, endian); ret = xgmac_wait_until_free(&bus->dev, regs, endian); if (ret) return ret; /* Set the port and dev addr */ mdio_ctl = MDIO_CTL_PORT_ADDR(phy_id) | MDIO_CTL_DEV_ADDR(dev_addr); xgmac_write32(mdio_ctl, ®s->mdio_ctl, endian); /* Set the register address */ if (regnum & MII_ADDR_C45) { xgmac_write32(regnum & 0xffff, ®s->mdio_addr, endian); ret = xgmac_wait_until_free(&bus->dev, regs, endian); if (ret) return ret; } /* Write the value to the register */ xgmac_write32(MDIO_DATA(value), ®s->mdio_data, endian); ret = xgmac_wait_until_done(&bus->dev, regs, endian); if (ret) return ret; return 0; } /* * Reads from register regnum in the PHY for device dev, returning the value. * Clears miimcom first. All PHY configuration has to be done through the * TSEC1 MIIM regs. */ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum) { struct mdio_fsl_priv *priv = (struct mdio_fsl_priv *)bus->priv; struct tgec_mdio_controller __iomem *regs = priv->mdio_base; uint16_t dev_addr; uint32_t mdio_stat; uint32_t mdio_ctl; uint16_t value; int ret; bool endian = priv->is_little_endian; mdio_stat = xgmac_read32(®s->mdio_stat, endian); if (regnum & MII_ADDR_C45) { dev_addr = (regnum >> 16) & 0x1f; mdio_stat |= MDIO_STAT_ENC; } else { dev_addr = regnum & 0x1f; mdio_stat &= ~MDIO_STAT_ENC; } xgmac_write32(mdio_stat, ®s->mdio_stat, endian); ret = xgmac_wait_until_free(&bus->dev, regs, endian); if (ret) return ret; /* Set the Port and Device Addrs */ mdio_ctl = MDIO_CTL_PORT_ADDR(phy_id) | MDIO_CTL_DEV_ADDR(dev_addr); xgmac_write32(mdio_ctl, ®s->mdio_ctl, endian); /* Set the register address */ if (regnum & MII_ADDR_C45) { xgmac_write32(regnum & 0xffff, ®s->mdio_addr, endian); ret = xgmac_wait_until_free(&bus->dev, regs, endian); if (ret) return ret; } /* Initiate the read */ xgmac_write32(mdio_ctl | MDIO_CTL_READ, ®s->mdio_ctl, endian); ret = xgmac_wait_until_done(&bus->dev, regs, endian); if (ret) return ret; /* Return all Fs if nothing was there */ if (xgmac_read32(®s->mdio_stat, endian) & MDIO_STAT_RD_ER) { dev_err(&bus->dev, "Error while reading PHY%d reg at %d.%hhu\n", phy_id, dev_addr, regnum); return 0xffff; } value = xgmac_read32(®s->mdio_data, endian) & 0xffff; dev_dbg(&bus->dev, "read %04x\n", value); return value; } static int xgmac_mdio_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct mii_bus *bus; struct resource res; struct mdio_fsl_priv *priv; int ret; ret = of_address_to_resource(np, 0, &res); if (ret) { dev_err(&pdev->dev, "could not obtain address\n"); return ret; } bus = mdiobus_alloc_size(sizeof(struct mdio_fsl_priv)); if (!bus) return -ENOMEM; bus->name = "Freescale XGMAC MDIO Bus"; bus->read = xgmac_mdio_read; bus->write = xgmac_mdio_write; bus->parent = &pdev->dev; snprintf(bus->id, MII_BUS_ID_SIZE, "%llx", (unsigned long long)res.start); /* Set the PHY base address */ priv = bus->priv; priv->mdio_base = of_iomap(np, 0); if (!priv->mdio_base) { ret = -ENOMEM; goto err_ioremap; } priv->is_little_endian = of_property_read_bool(pdev->dev.of_node, "little-endian"); ret = of_mdiobus_register(bus, np); if (ret) { dev_err(&pdev->dev, "cannot register MDIO bus\n"); goto err_registration; } platform_set_drvdata(pdev, bus); return 0; err_registration: iounmap(priv->mdio_base); err_ioremap: mdiobus_free(bus); return ret; } static int xgmac_mdio_remove(struct platform_device *pdev) { struct mii_bus *bus = platform_get_drvdata(pdev); mdiobus_unregister(bus); iounmap(bus->priv); mdiobus_free(bus); return 0; } static const struct of_device_id xgmac_mdio_match[] = { { .compatible = "fsl,fman-xmdio", }, { .compatible = "fsl,fman-memac-mdio", }, {}, }; MODULE_DEVICE_TABLE(of, xgmac_mdio_match); static struct platform_driver xgmac_mdio_driver = { .driver = { .name = "fsl-fman_xmdio", .of_match_table = xgmac_mdio_match, }, .probe = xgmac_mdio_probe, .remove = xgmac_mdio_remove, }; module_platform_driver(xgmac_mdio_driver); MODULE_DESCRIPTION("Freescale QorIQ 10G MDIO Controller"); MODULE_LICENSE("GPL v2");