/* * B53 register access through MII registers * * Copyright (C) 2011-2013 Jonas Gorski * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include "b53_priv.h" /* MII registers */ #define REG_MII_PAGE 0x10 /* MII Page register */ #define REG_MII_ADDR 0x11 /* MII Address register */ #define REG_MII_DATA0 0x18 /* MII Data register 0 */ #define REG_MII_DATA1 0x19 /* MII Data register 1 */ #define REG_MII_DATA2 0x1a /* MII Data register 2 */ #define REG_MII_DATA3 0x1b /* MII Data register 3 */ #define REG_MII_PAGE_ENABLE BIT(0) #define REG_MII_ADDR_WRITE BIT(0) #define REG_MII_ADDR_READ BIT(1) static int b53_mdio_op(struct b53_device *dev, u8 page, u8 reg, u16 op) { int i; u16 v; int ret; struct mii_bus *bus = dev->priv; if (dev->current_page != page) { /* set page number */ v = (page << 8) | REG_MII_PAGE_ENABLE; ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_PAGE, v); if (ret) return ret; dev->current_page = page; } /* set register address */ v = (reg << 8) | op; ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_ADDR, v); if (ret) return ret; /* check if operation completed */ for (i = 0; i < 5; ++i) { v = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_ADDR); if (!(v & (REG_MII_ADDR_WRITE | REG_MII_ADDR_READ))) break; usleep_range(10, 100); } if (WARN_ON(i == 5)) return -EIO; return 0; } static int b53_mdio_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val) { struct mii_bus *bus = dev->priv; int ret; ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ); if (ret) return ret; *val = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0) & 0xff; return 0; } static int b53_mdio_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val) { struct mii_bus *bus = dev->priv; int ret; ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ); if (ret) return ret; *val = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0); return 0; } static int b53_mdio_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val) { struct mii_bus *bus = dev->priv; int ret; ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ); if (ret) return ret; *val = mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0); *val |= mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA1) << 16; return 0; } static int b53_mdio_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val) { struct mii_bus *bus = dev->priv; u64 temp = 0; int i; int ret; ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ); if (ret) return ret; for (i = 2; i >= 0; i--) { temp <<= 16; temp |= mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0 + i); } *val = temp; return 0; } static int b53_mdio_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val) { struct mii_bus *bus = dev->priv; u64 temp = 0; int i; int ret; ret = b53_mdio_op(dev, page, reg, REG_MII_ADDR_READ); if (ret) return ret; for (i = 3; i >= 0; i--) { temp <<= 16; temp |= mdiobus_read_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0 + i); } *val = temp; return 0; } static int b53_mdio_write8(struct b53_device *dev, u8 page, u8 reg, u8 value) { struct mii_bus *bus = dev->priv; int ret; ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0, value); if (ret) return ret; return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE); } static int b53_mdio_write16(struct b53_device *dev, u8 page, u8 reg, u16 value) { struct mii_bus *bus = dev->priv; int ret; ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0, value); if (ret) return ret; return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE); } static int b53_mdio_write32(struct b53_device *dev, u8 page, u8 reg, u32 value) { struct mii_bus *bus = dev->priv; unsigned int i; u32 temp = value; for (i = 0; i < 2; i++) { int ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0 + i, temp & 0xffff); if (ret) return ret; temp >>= 16; } return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE); } static int b53_mdio_write48(struct b53_device *dev, u8 page, u8 reg, u64 value) { struct mii_bus *bus = dev->priv; unsigned int i; u64 temp = value; for (i = 0; i < 3; i++) { int ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0 + i, temp & 0xffff); if (ret) return ret; temp >>= 16; } return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE); } static int b53_mdio_write64(struct b53_device *dev, u8 page, u8 reg, u64 value) { struct mii_bus *bus = dev->priv; unsigned int i; u64 temp = value; for (i = 0; i < 4; i++) { int ret = mdiobus_write_nested(bus, BRCM_PSEUDO_PHY_ADDR, REG_MII_DATA0 + i, temp & 0xffff); if (ret) return ret; temp >>= 16; } return b53_mdio_op(dev, page, reg, REG_MII_ADDR_WRITE); } static int b53_mdio_phy_read16(struct b53_device *dev, int addr, int reg, u16 *value) { struct mii_bus *bus = dev->priv; *value = mdiobus_read_nested(bus, addr, reg); return 0; } static int b53_mdio_phy_write16(struct b53_device *dev, int addr, int reg, u16 value) { struct mii_bus *bus = dev->bus; return mdiobus_write_nested(bus, addr, reg, value); } static const struct b53_io_ops b53_mdio_ops = { .read8 = b53_mdio_read8, .read16 = b53_mdio_read16, .read32 = b53_mdio_read32, .read48 = b53_mdio_read48, .read64 = b53_mdio_read64, .write8 = b53_mdio_write8, .write16 = b53_mdio_write16, .write32 = b53_mdio_write32, .write48 = b53_mdio_write48, .write64 = b53_mdio_write64, .phy_read16 = b53_mdio_phy_read16, .phy_write16 = b53_mdio_phy_write16, }; #define B53_BRCM_OUI_1 0x0143bc00 #define B53_BRCM_OUI_2 0x03625c00 #define B53_BRCM_OUI_3 0x00406000 static int b53_mdio_probe(struct mdio_device *mdiodev) { struct b53_device *dev; u32 phy_id; int ret; /* allow the generic PHY driver to take over the non-management MDIO * addresses */ if (mdiodev->addr != BRCM_PSEUDO_PHY_ADDR && mdiodev->addr != 0) { dev_err(&mdiodev->dev, "leaving address %d to PHY\n", mdiodev->addr); return -ENODEV; } /* read the first port's id */ phy_id = mdiobus_read(mdiodev->bus, 0, 2) << 16; phy_id |= mdiobus_read(mdiodev->bus, 0, 3); /* BCM5325, BCM539x (OUI_1) * BCM53125, BCM53128 (OUI_2) * BCM5365 (OUI_3) */ if ((phy_id & 0xfffffc00) != B53_BRCM_OUI_1 && (phy_id & 0xfffffc00) != B53_BRCM_OUI_2 && (phy_id & 0xfffffc00) != B53_BRCM_OUI_3) { dev_err(&mdiodev->dev, "Unsupported device: 0x%08x\n", phy_id); return -ENODEV; } /* First probe will come from SWITCH_MDIO controller on the 7445D0 * switch, which will conflict with the 7445 integrated switch * pseudo-phy (we end-up programming both). In that case, we return * -EPROBE_DEFER for the first time we get here, and wait until we come * back with the slave MDIO bus which has the correct indirection * layer setup */ if (of_machine_is_compatible("brcm,bcm7445d0") && strcmp(mdiodev->bus->name, "sf2 slave mii")) return -EPROBE_DEFER; dev = b53_switch_alloc(&mdiodev->dev, &b53_mdio_ops, mdiodev->bus); if (!dev) return -ENOMEM; /* we don't use page 0xff, so force a page set */ dev->current_page = 0xff; dev->bus = mdiodev->bus; dev_set_drvdata(&mdiodev->dev, dev); ret = b53_switch_register(dev); if (ret) { dev_err(&mdiodev->dev, "failed to register switch: %i\n", ret); return ret; } return ret; } static void b53_mdio_remove(struct mdio_device *mdiodev) { struct b53_device *dev = dev_get_drvdata(&mdiodev->dev); struct dsa_switch *ds = dev->ds; dsa_unregister_switch(ds); } static const struct of_device_id b53_of_match[] = { { .compatible = "brcm,bcm5325" }, { .compatible = "brcm,bcm53115" }, { .compatible = "brcm,bcm53125" }, { .compatible = "brcm,bcm53128" }, { .compatible = "brcm,bcm5365" }, { .compatible = "brcm,bcm5395" }, { .compatible = "brcm,bcm5397" }, { .compatible = "brcm,bcm5398" }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, b53_of_match); static struct mdio_driver b53_mdio_driver = { .probe = b53_mdio_probe, .remove = b53_mdio_remove, .mdiodrv.driver = { .name = "bcm53xx", .of_match_table = b53_of_match, }, }; static int __init b53_mdio_driver_register(void) { return mdio_driver_register(&b53_mdio_driver); } module_init(b53_mdio_driver_register); static void __exit b53_mdio_driver_unregister(void) { mdio_driver_unregister(&b53_mdio_driver); } module_exit(b53_mdio_driver_unregister); MODULE_DESCRIPTION("B53 MDIO access driver"); MODULE_LICENSE("Dual BSD/GPL");