| /******************************************************************************* |
| STMMAC Ethernet Driver -- MDIO bus implementation |
| Provides Bus interface for MII registers |
| |
| Copyright (C) 2007-2009 STMicroelectronics Ltd |
| |
| This program is free software; you can redistribute it and/or modify it |
| under the terms and conditions of the GNU General Public License, |
| version 2, as published by the Free Software Foundation. |
| |
| This program is distributed in the hope it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| more details. |
| |
| You should have received a copy of the GNU General Public License along with |
| this program; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| |
| The full GNU General Public License is included in this distribution in |
| the file called "COPYING". |
| |
| Author: Carl Shaw <carl.shaw@st.com> |
| Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com> |
| *******************************************************************************/ |
| |
| #include <linux/mii.h> |
| #include <linux/phy.h> |
| #include <linux/slab.h> |
| |
| #include "stmmac.h" |
| |
| #define MII_BUSY 0x00000001 |
| #define MII_WRITE 0x00000002 |
| |
| /** |
| * stmmac_mdio_read |
| * @bus: points to the mii_bus structure |
| * @phyaddr: MII addr reg bits 15-11 |
| * @phyreg: MII addr reg bits 10-6 |
| * Description: it reads data from the MII register from within the phy device. |
| * For the 7111 GMAC, we must set the bit 0 in the MII address register while |
| * accessing the PHY registers. |
| * Fortunately, it seems this has no drawback for the 7109 MAC. |
| */ |
| static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg) |
| { |
| struct net_device *ndev = bus->priv; |
| struct stmmac_priv *priv = netdev_priv(ndev); |
| unsigned int mii_address = priv->hw->mii.addr; |
| unsigned int mii_data = priv->hw->mii.data; |
| |
| int data; |
| u16 regValue = (((phyaddr << 11) & (0x0000F800)) | |
| ((phyreg << 6) & (0x000007C0))); |
| regValue |= MII_BUSY | ((priv->plat->clk_csr & 7) << 2); |
| |
| do {} while (((readl(priv->ioaddr + mii_address)) & MII_BUSY) == 1); |
| writel(regValue, priv->ioaddr + mii_address); |
| do {} while (((readl(priv->ioaddr + mii_address)) & MII_BUSY) == 1); |
| |
| /* Read the data from the MII data register */ |
| data = (int)readl(priv->ioaddr + mii_data); |
| |
| return data; |
| } |
| |
| /** |
| * stmmac_mdio_write |
| * @bus: points to the mii_bus structure |
| * @phyaddr: MII addr reg bits 15-11 |
| * @phyreg: MII addr reg bits 10-6 |
| * @phydata: phy data |
| * Description: it writes the data into the MII register from within the device. |
| */ |
| static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg, |
| u16 phydata) |
| { |
| struct net_device *ndev = bus->priv; |
| struct stmmac_priv *priv = netdev_priv(ndev); |
| unsigned int mii_address = priv->hw->mii.addr; |
| unsigned int mii_data = priv->hw->mii.data; |
| |
| u16 value = |
| (((phyaddr << 11) & (0x0000F800)) | ((phyreg << 6) & (0x000007C0))) |
| | MII_WRITE; |
| |
| value |= MII_BUSY | ((priv->plat->clk_csr & 7) << 2); |
| |
| |
| /* Wait until any existing MII operation is complete */ |
| do {} while (((readl(priv->ioaddr + mii_address)) & MII_BUSY) == 1); |
| |
| /* Set the MII address register to write */ |
| writel(phydata, priv->ioaddr + mii_data); |
| writel(value, priv->ioaddr + mii_address); |
| |
| /* Wait until any existing MII operation is complete */ |
| do {} while (((readl(priv->ioaddr + mii_address)) & MII_BUSY) == 1); |
| |
| return 0; |
| } |
| |
| /** |
| * stmmac_mdio_reset |
| * @bus: points to the mii_bus structure |
| * Description: reset the MII bus |
| */ |
| static int stmmac_mdio_reset(struct mii_bus *bus) |
| { |
| struct net_device *ndev = bus->priv; |
| struct stmmac_priv *priv = netdev_priv(ndev); |
| unsigned int mii_address = priv->hw->mii.addr; |
| |
| if (priv->phy_reset) { |
| pr_debug("stmmac_mdio_reset: calling phy_reset\n"); |
| priv->phy_reset(priv->plat->bsp_priv); |
| } |
| |
| /* This is a workaround for problems with the STE101P PHY. |
| * It doesn't complete its reset until at least one clock cycle |
| * on MDC, so perform a dummy mdio read. |
| */ |
| writel(0, priv->ioaddr + mii_address); |
| |
| return 0; |
| } |
| |
| /** |
| * stmmac_mdio_register |
| * @ndev: net device structure |
| * Description: it registers the MII bus |
| */ |
| int stmmac_mdio_register(struct net_device *ndev) |
| { |
| int err = 0; |
| struct mii_bus *new_bus; |
| int *irqlist; |
| struct stmmac_priv *priv = netdev_priv(ndev); |
| int addr, found; |
| |
| new_bus = mdiobus_alloc(); |
| if (new_bus == NULL) |
| return -ENOMEM; |
| |
| irqlist = kzalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); |
| if (irqlist == NULL) { |
| err = -ENOMEM; |
| goto irqlist_alloc_fail; |
| } |
| |
| /* Assign IRQ to phy at address phy_addr */ |
| if (priv->phy_addr != -1) |
| irqlist[priv->phy_addr] = priv->phy_irq; |
| |
| new_bus->name = "STMMAC MII Bus"; |
| new_bus->read = &stmmac_mdio_read; |
| new_bus->write = &stmmac_mdio_write; |
| new_bus->reset = &stmmac_mdio_reset; |
| snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", priv->plat->bus_id); |
| new_bus->priv = ndev; |
| new_bus->irq = irqlist; |
| new_bus->phy_mask = priv->phy_mask; |
| new_bus->parent = priv->device; |
| err = mdiobus_register(new_bus); |
| if (err != 0) { |
| pr_err("%s: Cannot register as MDIO bus\n", new_bus->name); |
| goto bus_register_fail; |
| } |
| |
| priv->mii = new_bus; |
| |
| found = 0; |
| for (addr = 0; addr < 32; addr++) { |
| struct phy_device *phydev = new_bus->phy_map[addr]; |
| if (phydev) { |
| if (priv->phy_addr == -1) { |
| priv->phy_addr = addr; |
| phydev->irq = priv->phy_irq; |
| irqlist[addr] = priv->phy_irq; |
| } |
| pr_info("%s: PHY ID %08x at %d IRQ %d (%s)%s\n", |
| ndev->name, phydev->phy_id, addr, |
| phydev->irq, dev_name(&phydev->dev), |
| (addr == priv->phy_addr) ? " active" : ""); |
| found = 1; |
| } |
| } |
| |
| if (!found) |
| pr_warning("%s: No PHY found\n", ndev->name); |
| |
| return 0; |
| bus_register_fail: |
| kfree(irqlist); |
| irqlist_alloc_fail: |
| kfree(new_bus); |
| return err; |
| } |
| |
| /** |
| * stmmac_mdio_unregister |
| * @ndev: net device structure |
| * Description: it unregisters the MII bus |
| */ |
| int stmmac_mdio_unregister(struct net_device *ndev) |
| { |
| struct stmmac_priv *priv = netdev_priv(ndev); |
| |
| mdiobus_unregister(priv->mii); |
| priv->mii->priv = NULL; |
| kfree(priv->mii); |
| |
| return 0; |
| } |