tp.c

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/* $Date: 2006/02/07 04:21:54 $ $RCSfile: tp.c,v $ $Revision: 1.73 $ */
#include "common.h"
#include "regs.h"
#include "tp.h"
#ifdef CONFIG_CHELSIO_T1_1G
#include "fpga_defs.h"
#endif

struct petp {
    adapter_t *adapter;
};

/* Pause deadlock avoidance parameters */
#define DROP_MSEC 16
#define DROP_PKTS_CNT  1

static void tp_init(adapter_t * ap, const struct tp_params *p,
            unsigned int tp_clk)
{
    u32 val;

    if (!t1_is_asic(ap))
        return;

    val = F_TP_IN_CSPI_CPL | F_TP_IN_CSPI_CHECK_IP_CSUM |
        F_TP_IN_CSPI_CHECK_TCP_CSUM | F_TP_IN_ESPI_ETHERNET;
    if (!p->pm_size)
        val |= F_OFFLOAD_DISABLE;
    else
        val |= F_TP_IN_ESPI_CHECK_IP_CSUM | F_TP_IN_ESPI_CHECK_TCP_CSUM;
    writel(val, ap->regs + A_TP_IN_CONFIG);
    writel(F_TP_OUT_CSPI_CPL |
           F_TP_OUT_ESPI_ETHERNET |
           F_TP_OUT_ESPI_GENERATE_IP_CSUM |
           F_TP_OUT_ESPI_GENERATE_TCP_CSUM, ap->regs + A_TP_OUT_CONFIG);
    writel(V_IP_TTL(64) |
           F_PATH_MTU /* IP DF bit */  |
           V_5TUPLE_LOOKUP(p->use_5tuple_mode) |
           V_SYN_COOKIE_PARAMETER(29), ap->regs + A_TP_GLOBAL_CONFIG);
    /*
     * Enable pause frame deadlock prevention.
     */
    if (is_T2(ap) && ap->params.nports > 1) {
        u32 drop_ticks = DROP_MSEC * (tp_clk / 1000);

        writel(F_ENABLE_TX_DROP | F_ENABLE_TX_ERROR |
               V_DROP_TICKS_CNT(drop_ticks) |
               V_NUM_PKTS_DROPPED(DROP_PKTS_CNT),
               ap->regs + A_TP_TX_DROP_CONFIG);
    }
}

void t1_tp_destroy(struct petp *tp)
{
    kfree(tp);
}

struct petp *__devinit t1_tp_create(adapter_t * adapter, struct tp_params *p)
{
    struct petp *tp = kzalloc(sizeof(*tp), GFP_KERNEL);

    if (!tp)
        return NULL;

    tp->adapter = adapter;

    return tp;
}

void t1_tp_intr_enable(struct petp *tp)
{
    u32 tp_intr = readl(tp->adapter->regs + A_PL_ENABLE);

#ifdef CONFIG_CHELSIO_T1_1G
    if (!t1_is_asic(tp->adapter)) {
        /* FPGA */
        writel(0xffffffff,
               tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_ENABLE);
        writel(tp_intr | FPGA_PCIX_INTERRUPT_TP,
               tp->adapter->regs + A_PL_ENABLE);
    } else
#endif
    {
        /* We don't use any TP interrupts */
        writel(0, tp->adapter->regs + A_TP_INT_ENABLE);
        writel(tp_intr | F_PL_INTR_TP,
               tp->adapter->regs + A_PL_ENABLE);
    }
}

void t1_tp_intr_disable(struct petp *tp)
{
    u32 tp_intr = readl(tp->adapter->regs + A_PL_ENABLE);

#ifdef CONFIG_CHELSIO_T1_1G
    if (!t1_is_asic(tp->adapter)) {
        /* FPGA */
        writel(0, tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_ENABLE);
        writel(tp_intr & ~FPGA_PCIX_INTERRUPT_TP,
               tp->adapter->regs + A_PL_ENABLE);
    } else
#endif
    {
        writel(0, tp->adapter->regs + A_TP_INT_ENABLE);
        writel(tp_intr & ~F_PL_INTR_TP,
               tp->adapter->regs + A_PL_ENABLE);
    }
}

void t1_tp_intr_clear(struct petp *tp)
{
#ifdef CONFIG_CHELSIO_T1_1G
    if (!t1_is_asic(tp->adapter)) {
        writel(0xffffffff,
               tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_CAUSE);
        writel(FPGA_PCIX_INTERRUPT_TP, tp->adapter->regs + A_PL_CAUSE);
        return;
    }
#endif
    writel(0xffffffff, tp->adapter->regs + A_TP_INT_CAUSE);
    writel(F_PL_INTR_TP, tp->adapter->regs + A_PL_CAUSE);
}

int t1_tp_intr_handler(struct petp *tp)
{
    u32 cause;

#ifdef CONFIG_CHELSIO_T1_1G
    /* FPGA doesn't support TP interrupts. */
    if (!t1_is_asic(tp->adapter))
        return 1;
#endif

    cause = readl(tp->adapter->regs + A_TP_INT_CAUSE);
    writel(cause, tp->adapter->regs + A_TP_INT_CAUSE);
    return 0;
}

static void set_csum_offload(struct petp *tp, u32 csum_bit, int enable)
{
    u32 val = readl(tp->adapter->regs + A_TP_GLOBAL_CONFIG);

    if (enable)
        val |= csum_bit;
    else
        val &= ~csum_bit;
    writel(val, tp->adapter->regs + A_TP_GLOBAL_CONFIG);
}

void t1_tp_set_ip_checksum_offload(struct petp *tp, int enable)
{
    set_csum_offload(tp, F_IP_CSUM, enable);
}

void t1_tp_set_tcp_checksum_offload(struct petp *tp, int enable)
{
    set_csum_offload(tp, F_TCP_CSUM, enable);
}

/*
 * Initialize TP state.  tp_params contains initial settings for some TP
 * parameters, particularly the one-time PM and CM settings.
 */
int t1_tp_reset(struct petp *tp, struct tp_params *p, unsigned int tp_clk)
{
    adapter_t *adapter = tp->adapter;

    tp_init(adapter, p, tp_clk);
    writel(F_TP_RESET, adapter->regs +  A_TP_RESET);
    return 0;
}