diff options
Diffstat (limited to 'drivers/net/xilinx_emaclite.c')
| -rw-r--r-- | drivers/net/xilinx_emaclite.c | 384 |
1 files changed, 336 insertions, 48 deletions
diff --git a/drivers/net/xilinx_emaclite.c b/drivers/net/xilinx_emaclite.c index 8c777ba4e2b3..1a74594224b1 100644 --- a/drivers/net/xilinx_emaclite.c +++ b/drivers/net/xilinx_emaclite.c @@ -22,11 +22,17 @@ #include <linux/of_device.h> #include <linux/of_platform.h> +#include <linux/of_mdio.h> +#include <linux/phy.h> #define DRIVER_NAME "xilinx_emaclite" /* Register offsets for the EmacLite Core */ #define XEL_TXBUFF_OFFSET 0x0 /* Transmit Buffer */ +#define XEL_MDIOADDR_OFFSET 0x07E4 /* MDIO Address Register */ +#define XEL_MDIOWR_OFFSET 0x07E8 /* MDIO Write Data Register */ +#define XEL_MDIORD_OFFSET 0x07EC /* MDIO Read Data Register */ +#define XEL_MDIOCTRL_OFFSET 0x07F0 /* MDIO Control Register */ #define XEL_GIER_OFFSET 0x07F8 /* GIE Register */ #define XEL_TSR_OFFSET 0x07FC /* Tx status */ #define XEL_TPLR_OFFSET 0x07F4 /* Tx packet length */ @@ -37,6 +43,22 @@ #define XEL_BUFFER_OFFSET 0x0800 /* Next Tx/Rx buffer's offset */ +/* MDIO Address Register Bit Masks */ +#define XEL_MDIOADDR_REGADR_MASK 0x0000001F /* Register Address */ +#define XEL_MDIOADDR_PHYADR_MASK 0x000003E0 /* PHY Address */ +#define XEL_MDIOADDR_PHYADR_SHIFT 5 +#define XEL_MDIOADDR_OP_MASK 0x00000400 /* RD/WR Operation */ + +/* MDIO Write Data Register Bit Masks */ +#define XEL_MDIOWR_WRDATA_MASK 0x0000FFFF /* Data to be Written */ + +/* MDIO Read Data Register Bit Masks */ +#define XEL_MDIORD_RDDATA_MASK 0x0000FFFF /* Data to be Read */ + +/* MDIO Control Register Bit Masks */ +#define XEL_MDIOCTRL_MDIOSTS_MASK 0x00000001 /* MDIO Status Mask */ +#define XEL_MDIOCTRL_MDIOEN_MASK 0x00000008 /* MDIO Enable */ + /* Global Interrupt Enable Register (GIER) Bit Masks */ #define XEL_GIER_GIE_MASK 0x80000000 /* Global Enable */ @@ -87,6 +109,12 @@ * @reset_lock: lock used for synchronization * @deferred_skb: holds an skb (for transmission at a later time) when the * Tx buffer is not free + * @phy_dev: pointer to the PHY device + * @phy_node: pointer to the PHY device node + * @mii_bus: pointer to the MII bus + * @mdio_irqs: IRQs table for MDIO bus + * @last_link: last link status + * @has_mdio: indicates whether MDIO is included in the HW */ struct net_local { @@ -100,6 +128,15 @@ struct net_local { spinlock_t reset_lock; struct sk_buff *deferred_skb; + + struct phy_device *phy_dev; + struct device_node *phy_node; + + struct mii_bus *mii_bus; + int mdio_irqs[PHY_MAX_ADDR]; + + int last_link; + bool has_mdio; }; @@ -431,7 +468,7 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data) } /** - * xemaclite_set_mac_address - Set the MAC address for this device + * xemaclite_update_address - Update the MAC address in the device * @drvdata: Pointer to the Emaclite device private data * @address_ptr:Pointer to the MAC address (MAC address is a 48-bit value) * @@ -441,8 +478,8 @@ static u16 xemaclite_recv_data(struct net_local *drvdata, u8 *data) * The MAC address can be programmed using any of the two transmit * buffers (if configured). */ -static void xemaclite_set_mac_address(struct net_local *drvdata, - u8 *address_ptr) +static void xemaclite_update_address(struct net_local *drvdata, + u8 *address_ptr) { void __iomem *addr; u32 reg_data; @@ -465,6 +502,30 @@ static void xemaclite_set_mac_address(struct net_local *drvdata, } /** + * xemaclite_set_mac_address - Set the MAC address for this device + * @dev: Pointer to the network device instance + * @addr: Void pointer to the sockaddr structure + * + * This function copies the HW address from the sockaddr strucutre to the + * net_device structure and updates the address in HW. + * + * Return: Error if the net device is busy or 0 if the addr is set + * successfully + */ +static int xemaclite_set_mac_address(struct net_device *dev, void *address) +{ + struct net_local *lp = (struct net_local *) netdev_priv(dev); + struct sockaddr *addr = address; + + if (netif_running(dev)) + return -EBUSY; + + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); + xemaclite_update_address(lp, dev->dev_addr); + return 0; +} + +/** * xemaclite_tx_timeout - Callback for Tx Timeout * @dev: Pointer to the network device * @@ -641,12 +702,219 @@ static irqreturn_t xemaclite_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +/**********************/ +/* MDIO Bus functions */ +/**********************/ + +/** + * xemaclite_mdio_wait - Wait for the MDIO to be ready to use + * @lp: Pointer to the Emaclite device private data + * + * This function waits till the device is ready to accept a new MDIO + * request. + * + * Return: 0 for success or ETIMEDOUT for a timeout + */ + +static int xemaclite_mdio_wait(struct net_local *lp) +{ + long end = jiffies + 2; + + /* wait for the MDIO interface to not be busy or timeout + after some time. + */ + while (in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET) & + XEL_MDIOCTRL_MDIOSTS_MASK) { + if (end - jiffies <= 0) { + WARN_ON(1); + return -ETIMEDOUT; + } + msleep(1); + } + return 0; +} + +/** + * xemaclite_mdio_read - Read from a given MII management register + * @bus: the mii_bus struct + * @phy_id: the phy address + * @reg: register number to read from + * + * This function waits till the device is ready to accept a new MDIO + * request and then writes the phy address to the MDIO Address register + * and reads data from MDIO Read Data register, when its available. + * + * Return: Value read from the MII management register + */ +static int xemaclite_mdio_read(struct mii_bus *bus, int phy_id, int reg) +{ + struct net_local *lp = bus->priv; + u32 ctrl_reg; + u32 rc; + + if (xemaclite_mdio_wait(lp)) + return -ETIMEDOUT; + + /* Write the PHY address, register number and set the OP bit in the + * MDIO Address register. Set the Status bit in the MDIO Control + * register to start a MDIO read transaction. + */ + ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET); + out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET, + XEL_MDIOADDR_OP_MASK | + ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg)); + out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, + ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK); + + if (xemaclite_mdio_wait(lp)) + return -ETIMEDOUT; + + rc = in_be32(lp->base_addr + XEL_MDIORD_OFFSET); + + dev_dbg(&lp->ndev->dev, + "xemaclite_mdio_read(phy_id=%i, reg=%x) == %x\n", + phy_id, reg, rc); + + return rc; +} + +/** + * xemaclite_mdio_write - Write to a given MII management register + * @bus: the mii_bus struct + * @phy_id: the phy address + * @reg: register number to write to + * @val: value to write to the register number specified by reg + * + * This fucntion waits till the device is ready to accept a new MDIO + * request and then writes the val to the MDIO Write Data register. + */ +static int xemaclite_mdio_write(struct mii_bus *bus, int phy_id, int reg, + u16 val) +{ + struct net_local *lp = bus->priv; + u32 ctrl_reg; + + dev_dbg(&lp->ndev->dev, + "xemaclite_mdio_write(phy_id=%i, reg=%x, val=%x)\n", + phy_id, reg, val); + + if (xemaclite_mdio_wait(lp)) + return -ETIMEDOUT; + + /* Write the PHY address, register number and clear the OP bit in the + * MDIO Address register and then write the value into the MDIO Write + * Data register. Finally, set the Status bit in the MDIO Control + * register to start a MDIO write transaction. + */ + ctrl_reg = in_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET); + out_be32(lp->base_addr + XEL_MDIOADDR_OFFSET, + ~XEL_MDIOADDR_OP_MASK & + ((phy_id << XEL_MDIOADDR_PHYADR_SHIFT) | reg)); + out_be32(lp->base_addr + XEL_MDIOWR_OFFSET, val); + out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, + ctrl_reg | XEL_MDIOCTRL_MDIOSTS_MASK); + + return 0; +} + +/** + * xemaclite_mdio_reset - Reset the mdio bus. + * @bus: Pointer to the MII bus + * + * This function is required(?) as per Documentation/networking/phy.txt. + * There is no reset in this device; this function always returns 0. + */ +static int xemaclite_mdio_reset(struct mii_bus *bus) +{ + return 0; +} + +/** + * xemaclite_mdio_setup - Register mii_bus for the Emaclite device + * @lp: Pointer to the Emaclite device private data + * @ofdev: Pointer to OF device structure + * + * This function enables MDIO bus in the Emaclite device and registers a + * mii_bus. + * + * Return: 0 upon success or a negative error upon failure + */ +static int xemaclite_mdio_setup(struct net_local *lp, struct device *dev) +{ + struct mii_bus *bus; + int rc; + struct resource res; + struct device_node *np = of_get_parent(lp->phy_node); + + /* Don't register the MDIO bus if the phy_node or its parent node + * can't be found. + */ + if (!np) + return -ENODEV; + + /* Enable the MDIO bus by asserting the enable bit in MDIO Control + * register. + */ + out_be32(lp->base_addr + XEL_MDIOCTRL_OFFSET, + XEL_MDIOCTRL_MDIOEN_MASK); + + bus = mdiobus_alloc(); + if (!bus) + return -ENOMEM; + + of_address_to_resource(np, 0, &res); + snprintf(bus->id, MII_BUS_ID_SIZE, "%.8llx", + (unsigned long long)res.start); + bus->priv = lp; + bus->name = "Xilinx Emaclite MDIO"; + bus->read = xemaclite_mdio_read; + bus->write = xemaclite_mdio_write; + bus->reset = xemaclite_mdio_reset; + bus->parent = dev; + bus->irq = lp->mdio_irqs; /* preallocated IRQ table */ + + lp->mii_bus = bus; + + rc = of_mdiobus_register(bus, np); + if (rc) + goto err_register; + + return 0; + +err_register: + mdiobus_free(bus); + return rc; +} + +/** + * xemaclite_adjust_link - Link state callback for the Emaclite device + * @ndev: pointer to net_device struct + * + * There's nothing in the Emaclite device to be configured when the link + * state changes. We just print the status. + */ +void xemaclite_adjust_link(struct net_device *ndev) +{ + struct net_local *lp = netdev_priv(ndev); + struct phy_device *phy = lp->phy_dev; + int link_state; + + /* hash together the state values to decide if something has changed */ + link_state = phy->speed | (phy->duplex << 1) | phy->link; + + if (lp->last_link != link_state) { + lp->last_link = link_state; + phy_print_status(phy); + } +} + /** * xemaclite_open - Open the network device * @dev: Pointer to the network device * * This function sets the MAC address, requests an IRQ and enables interrupts * for the Emaclite device and starts the Tx queue. + * It also connects to the phy device, if MDIO is included in Emaclite device. */ static int xemaclite_open(struct net_device *dev) { @@ -656,14 +924,47 @@ static int xemaclite_open(struct net_device *dev) /* Just to be safe, stop the device first */ xemaclite_disable_interrupts(lp); + if (lp->phy_node) { + u32 bmcr; + + lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node, + xemaclite_adjust_link, 0, + PHY_INTERFACE_MODE_MII); + if (!lp->phy_dev) { + dev_err(&lp->ndev->dev, "of_phy_connect() failed\n"); + return -ENODEV; + } + + /* EmacLite doesn't support giga-bit speeds */ + lp->phy_dev->supported &= (PHY_BASIC_FEATURES); + lp->phy_dev->advertising = lp->phy_dev->supported; + + /* Don't advertise 1000BASE-T Full/Half duplex speeds */ + phy_write(lp->phy_dev, MII_CTRL1000, 0); + + /* Advertise only 10 and 100mbps full/half duplex speeds */ + phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL); + + /* Restart auto negotiation */ + bmcr = phy_read(lp->phy_dev, MII_BMCR); + bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART); + phy_write(lp->phy_dev, MII_BMCR, bmcr); + + phy_start(lp->phy_dev); + } + /* Set the MAC address each time opened */ - xemaclite_set_mac_address(lp, dev->dev_addr); + xemaclite_update_address(lp, dev->dev_addr); /* Grab the IRQ */ retval = request_irq(dev->irq, xemaclite_interrupt, 0, dev->name, dev); if (retval) { dev_err(&lp->ndev->dev, "Could not allocate interrupt %d\n", dev->irq); + if (lp->phy_dev) + phy_disconnect(lp->phy_dev); + lp->phy_dev = NULL; + return retval; } @@ -682,6 +983,7 @@ static int xemaclite_open(struct net_device *dev) * * This function stops the Tx queue, disables interrupts and frees the IRQ for * the Emaclite device. + * It also disconnects the phy device associated with the Emaclite device. */ static int xemaclite_close(struct net_device *dev) { @@ -691,6 +993,10 @@ static int xemaclite_close(struct net_device *dev) xemaclite_disable_interrupts(lp); free_irq(dev->irq, dev); + if (lp->phy_dev) + phy_disconnect(lp->phy_dev); + lp->phy_dev = NULL; + return 0; } @@ -754,42 +1060,6 @@ static int xemaclite_send(struct sk_buff *orig_skb, struct net_device *dev) } /** - * xemaclite_ioctl - Perform IO Control operations on the network device - * @dev: Pointer to the network device - * @rq: Pointer to the interface request structure - * @cmd: IOCTL command - * - * The only IOCTL operation supported by this function is setting the MAC - * address. An error is reported if any other operations are requested. - * - * Return: 0 to indicate success, or a negative error for failure. - */ -static int xemaclite_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) -{ - struct net_local *lp = (struct net_local *) netdev_priv(dev); - struct hw_addr_data *hw_addr = (struct hw_addr_data *) &rq->ifr_hwaddr; - - switch (cmd) { - case SIOCETHTOOL: - return -EIO; - - case SIOCSIFHWADDR: - dev_err(&lp->ndev->dev, "SIOCSIFHWADDR\n"); - - /* Copy MAC address in from user space */ - copy_from_user((void __force *) dev->dev_addr, - (void __user __force *) hw_addr, - IFHWADDRLEN); - xemaclite_set_mac_address(lp, dev->dev_addr); - break; - default: - return -EOPNOTSUPP; - } - - return 0; -} - -/** * xemaclite_remove_ndev - Free the network device * @ndev: Pointer to the network device to be freed * @@ -840,6 +1110,8 @@ static struct net_device_ops xemaclite_netdev_ops; * This function probes for the Emaclite device in the device tree. * It initializes the driver data structure and the hardware, sets the MAC * address and registers the network device. + * It also registers a mii_bus for the Emaclite device, if MDIO is included + * in the device. * * Return: 0, if the driver is bound to the Emaclite device, or * a negative error if there is failure. @@ -880,6 +1152,7 @@ static int __devinit xemaclite_of_probe(struct of_device *ofdev, } dev_set_drvdata(dev, ndev); + SET_NETDEV_DEV(ndev, &ofdev->dev); ndev->irq = r_irq.start; ndev->mem_start = r_mem.start; @@ -923,13 +1196,14 @@ static int __devinit xemaclite_of_probe(struct of_device *ofdev, out_be32(lp->base_addr + XEL_BUFFER_OFFSET + XEL_TSR_OFFSET, 0); /* Set the MAC address in the EmacLite device */ - xemaclite_set_mac_address(lp, ndev->dev_addr); + xemaclite_update_address(lp, ndev->dev_addr); - dev_info(dev, - "MAC address is now %2x:%2x:%2x:%2x:%2x:%2x\n", - ndev->dev_addr[0], ndev->dev_addr[1], - ndev->dev_addr[2], ndev->dev_addr[3], - ndev->dev_addr[4], ndev->dev_addr[5]); + lp->phy_node = of_parse_phandle(ofdev->node, "phy-handle", 0); + rc = xemaclite_mdio_setup(lp, &ofdev->dev); + if (rc) + dev_warn(&ofdev->dev, "error registering MDIO bus\n"); + + dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); ndev->netdev_ops = &xemaclite_netdev_ops; ndev->flags &= ~IFF_MULTICAST; @@ -972,12 +1246,25 @@ static int __devexit xemaclite_of_remove(struct of_device *of_dev) struct device *dev = &of_dev->dev; struct net_device *ndev = dev_get_drvdata(dev); + struct net_local *lp = (struct net_local *) netdev_priv(ndev); + + /* Un-register the mii_bus, if configured */ + if (lp->has_mdio) { + mdiobus_unregister(lp->mii_bus); + kfree(lp->mii_bus->irq); + mdiobus_free(lp->mii_bus); + lp->mii_bus = NULL; + } + unregister_netdev(ndev); + if (lp->phy_node) + of_node_put(lp->phy_node); + lp->phy_node = NULL; + release_mem_region(ndev->mem_start, ndev->mem_end-ndev->mem_start + 1); xemaclite_remove_ndev(ndev); - dev_set_drvdata(dev, NULL); return 0; @@ -987,7 +1274,7 @@ static struct net_device_ops xemaclite_netdev_ops = { .ndo_open = xemaclite_open, .ndo_stop = xemaclite_close, .ndo_start_xmit = xemaclite_send, - .ndo_do_ioctl = xemaclite_ioctl, + .ndo_set_mac_address = xemaclite_set_mac_address, .ndo_tx_timeout = xemaclite_tx_timeout, .ndo_get_stats = xemaclite_get_stats, }; @@ -999,6 +1286,7 @@ static struct of_device_id xemaclite_of_match[] __devinitdata = { { .compatible = "xlnx,xps-ethernetlite-1.00.a", }, { .compatible = "xlnx,xps-ethernetlite-2.00.a", }, { .compatible = "xlnx,xps-ethernetlite-2.01.a", }, + { .compatible = "xlnx,xps-ethernetlite-3.00.a", }, { /* end of list */ }, }; MODULE_DEVICE_TABLE(of, xemaclite_of_match); |