drivers/net/ethernet/chelsio/cxgb/tp.c

   1 /* $Date: 2006/02/07 04:21:54 $ $RCSfile: tp.c,v $ $Revision: 1.73 $ */
   2 #include "common.h"
   3 #include "regs.h"
   4 #include "tp.h"
   5 #ifdef CONFIG_CHELSIO_T1_1G
   6 #include "fpga_defs.h"
   7 #endif
   8
   9 struct petp {
  10         adapter_t *adapter;
  11 };
  12
  13 /* Pause deadlock avoidance parameters */
  14 #define DROP_MSEC 16
  15 #define DROP_PKTS_CNT  1
  16
  17 static void tp_init(adapter_t * ap, const struct tp_params *p,
  18                     unsigned int tp_clk)
  19 {
  20         u32 val;
  21
  22         if (!t1_is_asic(ap))
  23                 return;
  24
  25         val = F_TP_IN_CSPI_CPL | F_TP_IN_CSPI_CHECK_IP_CSUM |
  26                 F_TP_IN_CSPI_CHECK_TCP_CSUM | F_TP_IN_ESPI_ETHERNET;
  27         if (!p->pm_size)
  28                 val |= F_OFFLOAD_DISABLE;
  29         else
  30                 val |= F_TP_IN_ESPI_CHECK_IP_CSUM | F_TP_IN_ESPI_CHECK_TCP_CSUM;
  31         writel(val, ap->regs + A_TP_IN_CONFIG);
  32         writel(F_TP_OUT_CSPI_CPL |
  33                F_TP_OUT_ESPI_ETHERNET |
  34                F_TP_OUT_ESPI_GENERATE_IP_CSUM |
  35                F_TP_OUT_ESPI_GENERATE_TCP_CSUM, ap->regs + A_TP_OUT_CONFIG);
  36         writel(V_IP_TTL(64) |
  37                F_PATH_MTU /* IP DF bit */  |
  38                V_5TUPLE_LOOKUP(p->use_5tuple_mode) |
  39                V_SYN_COOKIE_PARAMETER(29), ap->regs + A_TP_GLOBAL_CONFIG);
  40         /*
  41          * Enable pause frame deadlock prevention.
  42          */
  43         if (is_T2(ap) && ap->params.nports > 1) {
  44                 u32 drop_ticks = DROP_MSEC * (tp_clk / 1000);
  45
  46                 writel(F_ENABLE_TX_DROP | F_ENABLE_TX_ERROR |
  47                        V_DROP_TICKS_CNT(drop_ticks) |
  48                        V_NUM_PKTS_DROPPED(DROP_PKTS_CNT),
  49                        ap->regs + A_TP_TX_DROP_CONFIG);
  50         }
  51 }
  52
  53 void t1_tp_destroy(struct petp *tp)
  54 {
  55         kfree(tp);
  56 }
  57
  58 struct petp *__devinit t1_tp_create(adapter_t * adapter, struct tp_params *p)
  59 {
  60         struct petp *tp = kzalloc(sizeof(*tp), GFP_KERNEL);
  61
  62         if (!tp)
  63                 return NULL;
  64
  65         tp->adapter = adapter;
  66
  67         return tp;
  68 }
  69
  70 void t1_tp_intr_enable(struct petp *tp)
  71 {
  72         u32 tp_intr = readl(tp->adapter->regs + A_PL_ENABLE);
  73
  74 #ifdef CONFIG_CHELSIO_T1_1G
  75         if (!t1_is_asic(tp->adapter)) {
  76                 /* FPGA */
  77                 writel(0xffffffff,
  78                        tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_ENABLE);
  79                 writel(tp_intr | FPGA_PCIX_INTERRUPT_TP,
  80                        tp->adapter->regs + A_PL_ENABLE);
  81         } else
  82 #endif
  83         {
  84                 /* We don't use any TP interrupts */
  85                 writel(0, tp->adapter->regs + A_TP_INT_ENABLE);
  86                 writel(tp_intr | F_PL_INTR_TP,
  87                        tp->adapter->regs + A_PL_ENABLE);
  88         }
  89 }
  90
  91 void t1_tp_intr_disable(struct petp *tp)
  92 {
  93         u32 tp_intr = readl(tp->adapter->regs + A_PL_ENABLE);
  94
  95 #ifdef CONFIG_CHELSIO_T1_1G
  96         if (!t1_is_asic(tp->adapter)) {
  97                 /* FPGA */
  98                 writel(0, tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_ENABLE);
  99                 writel(tp_intr & ~FPGA_PCIX_INTERRUPT_TP,
 100                        tp->adapter->regs + A_PL_ENABLE);
 101         } else
 102 #endif
 103         {
 104                 writel(0, tp->adapter->regs + A_TP_INT_ENABLE);
 105                 writel(tp_intr & ~F_PL_INTR_TP,
 106                        tp->adapter->regs + A_PL_ENABLE);
 107         }
 108 }
 109
 110 void t1_tp_intr_clear(struct petp *tp)
 111 {
 112 #ifdef CONFIG_CHELSIO_T1_1G
 113         if (!t1_is_asic(tp->adapter)) {
 114                 writel(0xffffffff,
 115                        tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_CAUSE);
 116                 writel(FPGA_PCIX_INTERRUPT_TP, tp->adapter->regs + A_PL_CAUSE);
 117                 return;
 118         }
 119 #endif
 120         writel(0xffffffff, tp->adapter->regs + A_TP_INT_CAUSE);
 121         writel(F_PL_INTR_TP, tp->adapter->regs + A_PL_CAUSE);
 122 }
 123
 124 int t1_tp_intr_handler(struct petp *tp)
 125 {
 126         u32 cause;
 127
 128 #ifdef CONFIG_CHELSIO_T1_1G
 129         /* FPGA doesn't support TP interrupts. */
 130         if (!t1_is_asic(tp->adapter))
 131                 return 1;
 132 #endif
 133
 134         cause = readl(tp->adapter->regs + A_TP_INT_CAUSE);
 135         writel(cause, tp->adapter->regs + A_TP_INT_CAUSE);
 136         return 0;
 137 }
 138
 139 static void set_csum_offload(struct petp *tp, u32 csum_bit, int enable)
 140 {
 141         u32 val = readl(tp->adapter->regs + A_TP_GLOBAL_CONFIG);
 142
 143         if (enable)
 144                 val |= csum_bit;
 145         else
 146                 val &= ~csum_bit;
 147         writel(val, tp->adapter->regs + A_TP_GLOBAL_CONFIG);
 148 }
 149
 150 void t1_tp_set_ip_checksum_offload(struct petp *tp, int enable)
 151 {
 152         set_csum_offload(tp, F_IP_CSUM, enable);
 153 }
 154
 155 void t1_tp_set_tcp_checksum_offload(struct petp *tp, int enable)
 156 {
 157         set_csum_offload(tp, F_TCP_CSUM, enable);
 158 }
 159
 160 /*
 161  * Initialize TP state.  tp_params contains initial settings for some TP
 162  * parameters, particularly the one-time PM and CM settings.
 163  */
 164 int t1_tp_reset(struct petp *tp, struct tp_params *p, unsigned int tp_clk)
 165 {
 166         adapter_t *adapter = tp->adapter;
 167
 168         tp_init(adapter, p, tp_clk);
 169         writel(F_TP_RESET, adapter->regs +  A_TP_RESET);
 170         return 0;
 171 }