projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 92744989 GL |
2 | /* |
| 3 | * MDIO bus driver for the Xilinx TEMAC device | |
| 4 | * | |
| 5 | * Copyright (c) 2009 Secret Lab Technologies, Ltd. | |
| 6 | */ | |
| 7 | ||
| 8 | #include <linux/io.h> | |
| 9 | #include <linux/netdevice.h> | |
| 10 | #include <linux/mutex.h> | |
| 11 | #include <linux/phy.h> | |
| 12 | #include <linux/of.h> | |
| 13 | #include <linux/of_device.h> | |
| 9f1a1fca | 14 | #include <linux/of_address.h> |
| 5a0e3ad6 | 15 | #include <linux/slab.h> |
| 92744989 GL |
16 | #include <linux/of_mdio.h> |
| 17 | ||
| 18 | #include "ll_temac.h" | |
| 19 | ||
| 20 | /* --------------------------------------------------------------------- | |
| 21 | * MDIO Bus functions | |
| 22 | */ | |
| 23 | static int temac_mdio_read(struct mii_bus *bus, int phy_id, int reg) | |
| 24 | { | |
| 25 | struct temac_local *lp = bus->priv; | |
| 26 | u32 rc; | |
| 27 | ||
| 28 | /* Write the PHY address to the MIIM Access Initiator register. | |
| 29 | * When the transfer completes, the PHY register value will appear | |
| 30 | * in the LSW0 register */ | |
| 31 | mutex_lock(&lp->indirect_mutex); | |
| 32 | temac_iow(lp, XTE_LSW0_OFFSET, (phy_id << 5) | reg); | |
| 33 | rc = temac_indirect_in32(lp, XTE_MIIMAI_OFFSET); | |
| 34 | mutex_unlock(&lp->indirect_mutex); | |
| 35 | ||
| 36 | dev_dbg(lp->dev, "temac_mdio_read(phy_id=%i, reg=%x) == %x\n", | |
| 37 | phy_id, reg, rc); | |
| 38 | ||
| 39 | return rc; | |
| 40 | } | |
| 41 | ||
| 42 | static int temac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val) | |
| 43 | { | |
| 44 | struct temac_local *lp = bus->priv; | |
| 45 | ||
| 46 | dev_dbg(lp->dev, "temac_mdio_write(phy_id=%i, reg=%x, val=%x)\n", | |
| 47 | phy_id, reg, val); | |
| 48 | ||
| 49 | /* First write the desired value into the write data register | |
| 50 | * and then write the address into the access initiator register | |
| 51 | */ | |
| 52 | mutex_lock(&lp->indirect_mutex); | |
| 53 | temac_indirect_out32(lp, XTE_MGTDR_OFFSET, val); | |
| 54 | temac_indirect_out32(lp, XTE_MIIMAI_OFFSET, (phy_id << 5) | reg); | |
| 55 | mutex_unlock(&lp->indirect_mutex); | |
| 56 | ||
| 57 | return 0; | |
| 58 | } | |
| 59 | ||
| 60 | int temac_mdio_setup(struct temac_local *lp, struct device_node *np) | |
| 61 | { | |
| 62 | struct mii_bus *bus; | |
| e734a42f | 63 | u32 bus_hz; |
| 92744989 | 64 | int clk_div; |
| e734a42f | 65 | int rc; |
| 92744989 GL |
66 | struct resource res; |
| 67 | ||
| 68 | /* Calculate a reasonable divisor for the clock rate */ | |
| 69 | clk_div = 0x3f; /* worst-case default setting */ | |
| e734a42f TK |
70 | if (of_property_read_u32(np, "clock-frequency", &bus_hz) == 0) { |
| 71 | clk_div = bus_hz / (2500 * 1000 * 2) - 1; | |
| 92744989 GL |
72 | if (clk_div < 1) |
| 73 | clk_div = 1; | |
| 74 | if (clk_div > 0x3f) | |
| 75 | clk_div = 0x3f; | |
| 76 | } | |
| 77 | ||
| 78 | /* Enable the MDIO bus by asserting the enable bit and writing | |
| 79 | * in the clock config */ | |
| 80 | mutex_lock(&lp->indirect_mutex); | |
| 81 | temac_indirect_out32(lp, XTE_MC_OFFSET, 1 << 6 | clk_div); | |
| 82 | mutex_unlock(&lp->indirect_mutex); | |
| 83 | ||
| 84 | bus = mdiobus_alloc(); | |
| 85 | if (!bus) | |
| 86 | return -ENOMEM; | |
| 87 | ||
| 88 | of_address_to_resource(np, 0, &res); | |
| 89 | snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx", | |
| 90 | (unsigned long long)res.start); | |
| 91 | bus->priv = lp; | |
| 92 | bus->name = "Xilinx TEMAC MDIO"; | |
| 93 | bus->read = temac_mdio_read; | |
| 94 | bus->write = temac_mdio_write; | |
| 95 | bus->parent = lp->dev; | |
| 92744989 GL |
96 | |
| 97 | lp->mii_bus = bus; | |
| 98 | ||
| 99 | rc = of_mdiobus_register(bus, np); | |
| 100 | if (rc) | |
| 101 | goto err_register; | |
| 102 | ||
| 103 | mutex_lock(&lp->indirect_mutex); | |
| 104 | dev_dbg(lp->dev, "MDIO bus registered; MC:%x\n", | |
| 105 | temac_indirect_in32(lp, XTE_MC_OFFSET)); | |
| 106 | mutex_unlock(&lp->indirect_mutex); | |
| 107 | return 0; | |
| 108 | ||
| 109 | err_register: | |
| 110 | mdiobus_free(bus); | |
| 111 | return rc; | |
| 112 | } | |
| 113 | ||
| 114 | void temac_mdio_teardown(struct temac_local *lp) | |
| 115 | { | |
| 116 | mdiobus_unregister(lp->mii_bus); | |
| 92744989 GL |
117 | mdiobus_free(lp->mii_bus); |
| 118 | lp->mii_bus = NULL; | |
| 119 | } | |
| 120 |