OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4

[zen-stable.git] / drivers / net / ethernet / atheros / atl1e / atl1e_hw.c

/*
 * Copyright(c) 2007 Atheros Corporation. All rights reserved.
 *
 * Derived from Intel e1000 driver
 * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that 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., 59
 * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/mii.h>
#include <linux/crc32.h>

#include "atl1e.h"

/*
 * check_eeprom_exist
 * return 0 if eeprom exist
 */
int atl1e_check_eeprom_exist(struct atl1e_hw *hw)
{
        u32 value;

        value = AT_READ_REG(hw, REG_SPI_FLASH_CTRL);
        if (value & SPI_FLASH_CTRL_EN_VPD) {
                value &= ~SPI_FLASH_CTRL_EN_VPD;
                AT_WRITE_REG(hw, REG_SPI_FLASH_CTRL, value);
        }
        value = AT_READ_REGW(hw, REG_PCIE_CAP_LIST);
        return ((value & 0xFF00) == 0x6C00) ? 0 : 1;
}

void atl1e_hw_set_mac_addr(struct atl1e_hw *hw)
{
        u32 value;
        /*
         * 00-0B-6A-F6-00-DC
         * 0:  6AF600DC 1: 000B
         * low dword
         */
        value = (((u32)hw->mac_addr[2]) << 24) |
                (((u32)hw->mac_addr[3]) << 16) |
                (((u32)hw->mac_addr[4]) << 8)  |
                (((u32)hw->mac_addr[5])) ;
        AT_WRITE_REG_ARRAY(hw, REG_MAC_STA_ADDR, 0, value);
        /* hight dword */
        value = (((u32)hw->mac_addr[0]) << 8) |
                (((u32)hw->mac_addr[1])) ;
        AT_WRITE_REG_ARRAY(hw, REG_MAC_STA_ADDR, 1, value);
}

/*
 * atl1e_get_permanent_address
 * return 0 if get valid mac address,
 */
static int atl1e_get_permanent_address(struct atl1e_hw *hw)
{
        u32 addr[2];
        u32 i;
        u32 twsi_ctrl_data;
        u8  eth_addr[ETH_ALEN];

        if (is_valid_ether_addr(hw->perm_mac_addr))
                return 0;

        /* init */
        addr[0] = addr[1] = 0;

        if (!atl1e_check_eeprom_exist(hw)) {
                /* eeprom exist */
                twsi_ctrl_data = AT_READ_REG(hw, REG_TWSI_CTRL);
                twsi_ctrl_data |= TWSI_CTRL_SW_LDSTART;
                AT_WRITE_REG(hw, REG_TWSI_CTRL, twsi_ctrl_data);
                for (i = 0; i < AT_TWSI_EEPROM_TIMEOUT; i++) {
                        msleep(10);
                        twsi_ctrl_data = AT_READ_REG(hw, REG_TWSI_CTRL);
                        if ((twsi_ctrl_data & TWSI_CTRL_SW_LDSTART) == 0)
                                break;
                }
                if (i >= AT_TWSI_EEPROM_TIMEOUT)
                        return AT_ERR_TIMEOUT;
        }

        /* maybe MAC-address is from BIOS */
        addr[0] = AT_READ_REG(hw, REG_MAC_STA_ADDR);
        addr[1] = AT_READ_REG(hw, REG_MAC_STA_ADDR + 4);
        *(u32 *) &eth_addr[2] = swab32(addr[0]);
        *(u16 *) &eth_addr[0] = swab16(*(u16 *)&addr[1]);

        if (is_valid_ether_addr(eth_addr)) {
                memcpy(hw->perm_mac_addr, eth_addr, ETH_ALEN);
                return 0;
        }

        return AT_ERR_EEPROM;
}

bool atl1e_write_eeprom(struct atl1e_hw *hw, u32 offset, u32 value)
{
        return true;
}

bool atl1e_read_eeprom(struct atl1e_hw *hw, u32 offset, u32 *p_value)
{
        int i;
        u32 control;

        if (offset & 3)
                return false; /* address do not align */

        AT_WRITE_REG(hw, REG_VPD_DATA, 0);
        control = (offset & VPD_CAP_VPD_ADDR_MASK) << VPD_CAP_VPD_ADDR_SHIFT;
        AT_WRITE_REG(hw, REG_VPD_CAP, control);

        for (i = 0; i < 10; i++) {
                msleep(2);
                control = AT_READ_REG(hw, REG_VPD_CAP);
                if (control & VPD_CAP_VPD_FLAG)
                        break;
        }
        if (control & VPD_CAP_VPD_FLAG) {
                *p_value = AT_READ_REG(hw, REG_VPD_DATA);
                return true;
        }
        return false; /* timeout */
}

void atl1e_force_ps(struct atl1e_hw *hw)
{
        AT_WRITE_REGW(hw, REG_GPHY_CTRL,
                        GPHY_CTRL_PW_WOL_DIS | GPHY_CTRL_EXT_RESET);
}

/*
 * Reads the adapter's MAC address from the EEPROM
 *
 * hw - Struct containing variables accessed by shared code
 */
int atl1e_read_mac_addr(struct atl1e_hw *hw)
{
        int err = 0;

        err = atl1e_get_permanent_address(hw);
        if (err)
                return AT_ERR_EEPROM;
        memcpy(hw->mac_addr, hw->perm_mac_addr, sizeof(hw->perm_mac_addr));
        return 0;
}

/*
 * atl1e_hash_mc_addr
 *  purpose
 *      set hash value for a multicast address
 */
u32 atl1e_hash_mc_addr(struct atl1e_hw *hw, u8 *mc_addr)
{
        u32 crc32;
        u32 value = 0;
        int i;

        crc32 = ether_crc_le(6, mc_addr);
        for (i = 0; i < 32; i++)
                value |= (((crc32 >> i) & 1) << (31 - i));

        return value;
}

/*
 * Sets the bit in the multicast table corresponding to the hash value.
 * hw - Struct containing variables accessed by shared code
 * hash_value - Multicast address hash value
 */
void atl1e_hash_set(struct atl1e_hw *hw, u32 hash_value)
{
        u32 hash_bit, hash_reg;
        u32 mta;

        /*
         * The HASH Table  is a register array of 2 32-bit registers.
         * It is treated like an array of 64 bits.  We want to set
         * bit BitArray[hash_value]. So we figure out what register
         * the bit is in, read it, OR in the new bit, then write
         * back the new value.  The register is determined by the
         * upper 7 bits of the hash value and the bit within that
         * register are determined by the lower 5 bits of the value.
         */
        hash_reg = (hash_value >> 31) & 0x1;
        hash_bit = (hash_value >> 26) & 0x1F;

        mta = AT_READ_REG_ARRAY(hw, REG_RX_HASH_TABLE, hash_reg);

        mta |= (1 << hash_bit);

        AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, hash_reg, mta);
}
/*
 * Reads the value from a PHY register
 * hw - Struct containing variables accessed by shared code
 * reg_addr - address of the PHY register to read
 */
int atl1e_read_phy_reg(struct atl1e_hw *hw, u16 reg_addr, u16 *phy_data)
{
        u32 val;
        int i;

        val = ((u32)(reg_addr & MDIO_REG_ADDR_MASK)) << MDIO_REG_ADDR_SHIFT |
                MDIO_START | MDIO_SUP_PREAMBLE | MDIO_RW |
                MDIO_CLK_25_4 << MDIO_CLK_SEL_SHIFT;

        AT_WRITE_REG(hw, REG_MDIO_CTRL, val);

        wmb();

        for (i = 0; i < MDIO_WAIT_TIMES; i++) {
                udelay(2);
                val = AT_READ_REG(hw, REG_MDIO_CTRL);
                if (!(val & (MDIO_START | MDIO_BUSY)))
                        break;
                wmb();
        }
        if (!(val & (MDIO_START | MDIO_BUSY))) {
                *phy_data = (u16)val;
                return 0;
        }

        return AT_ERR_PHY;
}

/*
 * Writes a value to a PHY register
 * hw - Struct containing variables accessed by shared code
 * reg_addr - address of the PHY register to write
 * data - data to write to the PHY
 */
int atl1e_write_phy_reg(struct atl1e_hw *hw, u32 reg_addr, u16 phy_data)
{
        int i;
        u32 val;

        val = ((u32)(phy_data & MDIO_DATA_MASK)) << MDIO_DATA_SHIFT |
               (reg_addr&MDIO_REG_ADDR_MASK) << MDIO_REG_ADDR_SHIFT |
               MDIO_SUP_PREAMBLE |
               MDIO_START |
               MDIO_CLK_25_4 << MDIO_CLK_SEL_SHIFT;

        AT_WRITE_REG(hw, REG_MDIO_CTRL, val);
        wmb();

        for (i = 0; i < MDIO_WAIT_TIMES; i++) {
                udelay(2);
                val = AT_READ_REG(hw, REG_MDIO_CTRL);
                if (!(val & (MDIO_START | MDIO_BUSY)))
                        break;
                wmb();
        }

        if (!(val & (MDIO_START | MDIO_BUSY)))
                return 0;

        return AT_ERR_PHY;
}

/*
 * atl1e_init_pcie - init PCIE module
 */
static void atl1e_init_pcie(struct atl1e_hw *hw)
{
        u32 value;
        /* comment 2lines below to save more power when sususpend
           value = LTSSM_TEST_MODE_DEF;
           AT_WRITE_REG(hw, REG_LTSSM_TEST_MODE, value);
         */

        /* pcie flow control mode change */
        value = AT_READ_REG(hw, 0x1008);
        value |= 0x8000;
        AT_WRITE_REG(hw, 0x1008, value);
}
/*
 * Configures PHY autoneg and flow control advertisement settings
 *
 * hw - Struct containing variables accessed by shared code
 */
static int atl1e_phy_setup_autoneg_adv(struct atl1e_hw *hw)
{
        s32 ret_val;
        u16 mii_autoneg_adv_reg;
        u16 mii_1000t_ctrl_reg;

        if (0 != hw->mii_autoneg_adv_reg)
                return 0;
        /* Read the MII Auto-Neg Advertisement Register (Address 4/9). */
        mii_autoneg_adv_reg = MII_AR_DEFAULT_CAP_MASK;
        mii_1000t_ctrl_reg  = MII_AT001_CR_1000T_DEFAULT_CAP_MASK;

        /*
         * Need to parse autoneg_advertised  and set up
         * the appropriate PHY registers.  First we will parse for
         * autoneg_advertised software override.  Since we can advertise
         * a plethora of combinations, we need to check each bit
         * individually.
         */

        /*
         * First we clear all the 10/100 mb speed bits in the Auto-Neg
         * Advertisement Register (Address 4) and the 1000 mb speed bits in
         * the  1000Base-T control Register (Address 9).
         */
        mii_autoneg_adv_reg &= ~ADVERTISE_ALL;
        mii_1000t_ctrl_reg  &= ~MII_AT001_CR_1000T_SPEED_MASK;

        /*
         * Need to parse MediaType and setup the
         * appropriate PHY registers.
         */
        switch (hw->media_type) {
        case MEDIA_TYPE_AUTO_SENSOR:
                mii_autoneg_adv_reg |= ADVERTISE_ALL;
                hw->autoneg_advertised = ADVERTISE_ALL;
                if (hw->nic_type == athr_l1e) {
                        mii_1000t_ctrl_reg |= ADVERTISE_1000FULL;
                        hw->autoneg_advertised |= ADVERTISE_1000_FULL;
                }
                break;

        case MEDIA_TYPE_100M_FULL:
                mii_autoneg_adv_reg   |= ADVERTISE_100FULL;
                hw->autoneg_advertised = ADVERTISE_100_FULL;
                break;

        case MEDIA_TYPE_100M_HALF:
                mii_autoneg_adv_reg   |= ADVERTISE_100_HALF;
                hw->autoneg_advertised = ADVERTISE_100_HALF;
                break;

        case MEDIA_TYPE_10M_FULL:
                mii_autoneg_adv_reg   |= ADVERTISE_10_FULL;
                hw->autoneg_advertised = ADVERTISE_10_FULL;
                break;

        default:
                mii_autoneg_adv_reg   |= ADVERTISE_10_HALF;
                hw->autoneg_advertised = ADVERTISE_10_HALF;
                break;
        }

        /* flow control fixed to enable all */
        mii_autoneg_adv_reg |= (ADVERTISE_PAUSE_ASYM | ADVERTISE_PAUSE_CAP);

        hw->mii_autoneg_adv_reg = mii_autoneg_adv_reg;
        hw->mii_1000t_ctrl_reg  = mii_1000t_ctrl_reg;

        ret_val = atl1e_write_phy_reg(hw, MII_ADVERTISE, mii_autoneg_adv_reg);
        if (ret_val)
                return ret_val;

        if (hw->nic_type == athr_l1e || hw->nic_type == athr_l2e_revA) {
                ret_val = atl1e_write_phy_reg(hw, MII_CTRL1000,
                                           mii_1000t_ctrl_reg);
                if (ret_val)
                        return ret_val;
        }

        return 0;
}


/*
 * Resets the PHY and make all config validate
 *
 * hw - Struct containing variables accessed by shared code
 *
 * Sets bit 15 and 12 of the MII control regiser (for F001 bug)
 */
int atl1e_phy_commit(struct atl1e_hw *hw)
{
        struct atl1e_adapter *adapter = hw->adapter;
        int ret_val;
        u16 phy_data;

        phy_data = BMCR_RESET | BMCR_ANENABLE | BMCR_ANRESTART;

        ret_val = atl1e_write_phy_reg(hw, MII_BMCR, phy_data);
        if (ret_val) {
                u32 val;
                int i;
                /**************************************
                 * pcie serdes link may be down !
                 **************************************/
                for (i = 0; i < 25; i++) {
                        msleep(1);
                        val = AT_READ_REG(hw, REG_MDIO_CTRL);
                        if (!(val & (MDIO_START | MDIO_BUSY)))
                                break;
                }

                if (0 != (val & (MDIO_START | MDIO_BUSY))) {
                        netdev_err(adapter->netdev,
                                   "pcie linkdown at least for 25ms\n");
                        return ret_val;
                }

                netdev_err(adapter->netdev, "pcie linkup after %d ms\n", i);
        }
        return 0;
}

int atl1e_phy_init(struct atl1e_hw *hw)
{
        struct atl1e_adapter *adapter = hw->adapter;
        s32 ret_val;
        u16 phy_val;

        if (hw->phy_configured) {
                if (hw->re_autoneg) {
                        hw->re_autoneg = false;
                        return atl1e_restart_autoneg(hw);
                }
                return 0;
        }

        /* RESET GPHY Core */
        AT_WRITE_REGW(hw, REG_GPHY_CTRL, GPHY_CTRL_DEFAULT);
        msleep(2);
        AT_WRITE_REGW(hw, REG_GPHY_CTRL, GPHY_CTRL_DEFAULT |
                      GPHY_CTRL_EXT_RESET);
        msleep(2);

        /* patches */
        /* p1. eable hibernation mode */
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_ADDR, 0xB);
        if (ret_val)
                return ret_val;
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_DATA, 0xBC00);
        if (ret_val)
                return ret_val;
        /* p2. set Class A/B for all modes */
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_ADDR, 0);
        if (ret_val)
                return ret_val;
        phy_val = 0x02ef;
        /* remove Class AB */
        /* phy_val = hw->emi_ca ? 0x02ef : 0x02df; */
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_DATA, phy_val);
        if (ret_val)
                return ret_val;
        /* p3. 10B ??? */
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_ADDR, 0x12);
        if (ret_val)
                return ret_val;
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_DATA, 0x4C04);
        if (ret_val)
                return ret_val;
        /* p4. 1000T power */
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_ADDR, 0x4);
        if (ret_val)
                return ret_val;
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_DATA, 0x8BBB);
        if (ret_val)
                return ret_val;

        ret_val = atl1e_write_phy_reg(hw, MII_DBG_ADDR, 0x5);
        if (ret_val)
                return ret_val;
        ret_val = atl1e_write_phy_reg(hw, MII_DBG_DATA, 0x2C46);
        if (ret_val)
                return ret_val;

        msleep(1);

        /*Enable PHY LinkChange Interrupt */
        ret_val = atl1e_write_phy_reg(hw, MII_INT_CTRL, 0xC00);
        if (ret_val) {
                netdev_err(adapter->netdev,
                           "Error enable PHY linkChange Interrupt\n");
                return ret_val;
        }
        /* setup AutoNeg parameters */
        ret_val = atl1e_phy_setup_autoneg_adv(hw);
        if (ret_val) {
                netdev_err(adapter->netdev,
                           "Error Setting up Auto-Negotiation\n");
                return ret_val;
        }
        /* SW.Reset & En-Auto-Neg to restart Auto-Neg*/
        netdev_dbg(adapter->netdev, "Restarting Auto-Negotiation\n");
        ret_val = atl1e_phy_commit(hw);
        if (ret_val) {
                netdev_err(adapter->netdev, "Error resetting the phy\n");
                return ret_val;
        }

        hw->phy_configured = true;

        return 0;
}

/*
 * Reset the transmit and receive units; mask and clear all interrupts.
 * hw - Struct containing variables accessed by shared code
 * return : 0  or  idle status (if error)
 */
int atl1e_reset_hw(struct atl1e_hw *hw)
{
        struct atl1e_adapter *adapter = hw->adapter;
        struct pci_dev *pdev = adapter->pdev;

        u32 idle_status_data = 0;
        u16 pci_cfg_cmd_word = 0;
        int timeout = 0;

        /* Workaround for PCI problem when BIOS sets MMRBC incorrectly. */
        pci_read_config_word(pdev, PCI_REG_COMMAND, &pci_cfg_cmd_word);
        if ((pci_cfg_cmd_word & (CMD_IO_SPACE |
                                CMD_MEMORY_SPACE | CMD_BUS_MASTER))
                        != (CMD_IO_SPACE | CMD_MEMORY_SPACE | CMD_BUS_MASTER)) {
                pci_cfg_cmd_word |= (CMD_IO_SPACE |
                                     CMD_MEMORY_SPACE | CMD_BUS_MASTER);
                pci_write_config_word(pdev, PCI_REG_COMMAND, pci_cfg_cmd_word);
        }

        /*
         * Issue Soft Reset to the MAC.  This will reset the chip's
         * transmit, receive, DMA.  It will not effect
         * the current PCI configuration.  The global reset bit is self-
         * clearing, and should clear within a microsecond.
         */
        AT_WRITE_REG(hw, REG_MASTER_CTRL,
                        MASTER_CTRL_LED_MODE | MASTER_CTRL_SOFT_RST);
        wmb();
        msleep(1);

        /* Wait at least 10ms for All module to be Idle */
        for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
                idle_status_data = AT_READ_REG(hw, REG_IDLE_STATUS);
                if (idle_status_data == 0)
                        break;
                msleep(1);
                cpu_relax();
        }

        if (timeout >= AT_HW_MAX_IDLE_DELAY) {
                netdev_err(adapter->netdev,
                           "MAC state machine can't be idle since disabled for 10ms second\n");
                return AT_ERR_TIMEOUT;
        }

        return 0;
}


/*
 * Performs basic configuration of the adapter.
 *
 * hw - Struct containing variables accessed by shared code
 * Assumes that the controller has previously been reset and is in a
 * post-reset uninitialized state. Initializes multicast table,
 * and  Calls routines to setup link
 * Leaves the transmit and receive units disabled and uninitialized.
 */
int atl1e_init_hw(struct atl1e_hw *hw)
{
        s32 ret_val = 0;

        atl1e_init_pcie(hw);

        /* Zero out the Multicast HASH table */
        /* clear the old settings from the multicast hash table */
        AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
        AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);

        ret_val = atl1e_phy_init(hw);

        return ret_val;
}

/*
 * Detects the current speed and duplex settings of the hardware.
 *
 * hw - Struct containing variables accessed by shared code
 * speed - Speed of the connection
 * duplex - Duplex setting of the connection
 */
int atl1e_get_speed_and_duplex(struct atl1e_hw *hw, u16 *speed, u16 *duplex)
{
        int err;
        u16 phy_data;

        /* Read   PHY Specific Status Register (17) */
        err = atl1e_read_phy_reg(hw, MII_AT001_PSSR, &phy_data);
        if (err)
                return err;

        if (!(phy_data & MII_AT001_PSSR_SPD_DPLX_RESOLVED))
                return AT_ERR_PHY_RES;

        switch (phy_data & MII_AT001_PSSR_SPEED) {
        case MII_AT001_PSSR_1000MBS:
                *speed = SPEED_1000;
                break;
        case MII_AT001_PSSR_100MBS:
                *speed = SPEED_100;
                break;
        case MII_AT001_PSSR_10MBS:
                *speed = SPEED_10;
                break;
        default:
                return AT_ERR_PHY_SPEED;
                break;
        }

        if (phy_data & MII_AT001_PSSR_DPLX)
                *duplex = FULL_DUPLEX;
        else
                *duplex = HALF_DUPLEX;

        return 0;
}

int atl1e_restart_autoneg(struct atl1e_hw *hw)
{
        int err = 0;

        err = atl1e_write_phy_reg(hw, MII_ADVERTISE, hw->mii_autoneg_adv_reg);
        if (err)
                return err;

        if (hw->nic_type == athr_l1e || hw->nic_type == athr_l2e_revA) {
                err = atl1e_write_phy_reg(hw, MII_CTRL1000,
                                       hw->mii_1000t_ctrl_reg);
                if (err)
                        return err;
        }

        err = atl1e_write_phy_reg(hw, MII_BMCR,
                        BMCR_RESET | BMCR_ANENABLE | BMCR_ANRESTART);
        return err;
}