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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* $Date: 2006/02/07 04:21:54 $ $RCSfile: tp.c,v $ $Revision: 1.73 $ */
   3 #include "common.h"
   4 #include "regs.h"
   5 #include "tp.h"
   6 #ifdef CONFIG_CHELSIO_T1_1G
   7 #include "fpga_defs.h"
   8 #endif
   9
  10 struct petp {
  11         adapter_t *adapter;
  12 };
  13
  14 /* Pause deadlock avoidance parameters */
  15 #define DROP_MSEC 16
  16 #define DROP_PKTS_CNT  1
  17
  18 static void tp_init(adapter_t * ap, const struct tp_params *p,
  19                     unsigned int tp_clk)
  20 {
  21         u32 val;
  22
  23         if (!t1_is_asic(ap))
  24                 return;
  25
  26         val = F_TP_IN_CSPI_CPL | F_TP_IN_CSPI_CHECK_IP_CSUM |
  27                 F_TP_IN_CSPI_CHECK_TCP_CSUM | F_TP_IN_ESPI_ETHERNET;
  28         if (!p->pm_size)
  29                 val |= F_OFFLOAD_DISABLE;
  30         else
  31                 val |= F_TP_IN_ESPI_CHECK_IP_CSUM | F_TP_IN_ESPI_CHECK_TCP_CSUM;
  32         writel(val, ap->regs + A_TP_IN_CONFIG);
  33         writel(F_TP_OUT_CSPI_CPL |
  34                F_TP_OUT_ESPI_ETHERNET |
  35                F_TP_OUT_ESPI_GENERATE_IP_CSUM |
  36                F_TP_OUT_ESPI_GENERATE_TCP_CSUM, ap->regs + A_TP_OUT_CONFIG);
  37         writel(V_IP_TTL(64) |
  38                F_PATH_MTU /* IP DF bit */  |
  39                V_5TUPLE_LOOKUP(p->use_5tuple_mode) |
  40                V_SYN_COOKIE_PARAMETER(29), ap->regs + A_TP_GLOBAL_CONFIG);
  41         /*
  42          * Enable pause frame deadlock prevention.
  43          */
  44         if (is_T2(ap) && ap->params.nports > 1) {
  45                 u32 drop_ticks = DROP_MSEC * (tp_clk / 1000);
  46
  47                 writel(F_ENABLE_TX_DROP | F_ENABLE_TX_ERROR |
  48                        V_DROP_TICKS_CNT(drop_ticks) |
  49                        V_NUM_PKTS_DROPPED(DROP_PKTS_CNT),
  50                        ap->regs + A_TP_TX_DROP_CONFIG);
  51         }
  52 }
  53
  54 void t1_tp_destroy(struct petp *tp)
  55 {
  56         kfree(tp);
  57 }
  58
  59 struct petp *t1_tp_create(adapter_t *adapter, struct tp_params *p)
  60 {
  61         struct petp *tp = kzalloc(sizeof(*tp), GFP_KERNEL);
  62
  63         if (!tp)
  64                 return NULL;
  65
  66         tp->adapter = adapter;
  67
  68         return tp;
  69 }
  70
  71 void t1_tp_intr_enable(struct petp *tp)
  72 {
  73         u32 tp_intr = readl(tp->adapter->regs + A_PL_ENABLE);
  74
  75 #ifdef CONFIG_CHELSIO_T1_1G
  76         if (!t1_is_asic(tp->adapter)) {
  77                 /* FPGA */
  78                 writel(0xffffffff,
  79                        tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_ENABLE);
  80                 writel(tp_intr | FPGA_PCIX_INTERRUPT_TP,
  81                        tp->adapter->regs + A_PL_ENABLE);
  82         } else
  83 #endif
  84         {
  85                 /* We don't use any TP interrupts */
  86                 writel(0, tp->adapter->regs + A_TP_INT_ENABLE);
  87                 writel(tp_intr | F_PL_INTR_TP,
  88                        tp->adapter->regs + A_PL_ENABLE);
  89         }
  90 }
  91
  92 void t1_tp_intr_disable(struct petp *tp)
  93 {
  94         u32 tp_intr = readl(tp->adapter->regs + A_PL_ENABLE);
  95
  96 #ifdef CONFIG_CHELSIO_T1_1G
  97         if (!t1_is_asic(tp->adapter)) {
  98                 /* FPGA */
  99                 writel(0, tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_ENABLE);
 100                 writel(tp_intr & ~FPGA_PCIX_INTERRUPT_TP,
 101                        tp->adapter->regs + A_PL_ENABLE);
 102         } else
 103 #endif
 104         {
 105                 writel(0, tp->adapter->regs + A_TP_INT_ENABLE);
 106                 writel(tp_intr & ~F_PL_INTR_TP,
 107                        tp->adapter->regs + A_PL_ENABLE);
 108         }
 109 }
 110
 111 void t1_tp_intr_clear(struct petp *tp)
 112 {
 113 #ifdef CONFIG_CHELSIO_T1_1G
 114         if (!t1_is_asic(tp->adapter)) {
 115                 writel(0xffffffff,
 116                        tp->adapter->regs + FPGA_TP_ADDR_INTERRUPT_CAUSE);
 117                 writel(FPGA_PCIX_INTERRUPT_TP, tp->adapter->regs + A_PL_CAUSE);
 118                 return;
 119         }
 120 #endif
 121         writel(0xffffffff, tp->adapter->regs + A_TP_INT_CAUSE);
 122         writel(F_PL_INTR_TP, tp->adapter->regs + A_PL_CAUSE);
 123 }
 124
 125 int t1_tp_intr_handler(struct petp *tp)
 126 {
 127         u32 cause;
 128
 129 #ifdef CONFIG_CHELSIO_T1_1G
 130         /* FPGA doesn't support TP interrupts. */
 131         if (!t1_is_asic(tp->adapter))
 132                 return 1;
 133 #endif
 134
 135         cause = readl(tp->adapter->regs + A_TP_INT_CAUSE);
 136         writel(cause, tp->adapter->regs + A_TP_INT_CAUSE);
 137         return 0;
 138 }
 139
 140 static void set_csum_offload(struct petp *tp, u32 csum_bit, int enable)
 141 {
 142         u32 val = readl(tp->adapter->regs + A_TP_GLOBAL_CONFIG);
 143
 144         if (enable)
 145                 val |= csum_bit;
 146         else
 147                 val &= ~csum_bit;
 148         writel(val, tp->adapter->regs + A_TP_GLOBAL_CONFIG);
 149 }
 150
 151 void t1_tp_set_ip_checksum_offload(struct petp *tp, int enable)
 152 {
 153         set_csum_offload(tp, F_IP_CSUM, enable);
 154 }
 155
 156 void t1_tp_set_tcp_checksum_offload(struct petp *tp, int enable)
 157 {
 158         set_csum_offload(tp, F_TCP_CSUM, enable);
 159 }
 160
 161 /*
 162  * Initialize TP state.  tp_params contains initial settings for some TP
 163  * parameters, particularly the one-time PM and CM settings.
 164  */
 165 int t1_tp_reset(struct petp *tp, struct tp_params *p, unsigned int tp_clk)
 166 {
 167         adapter_t *adapter = tp->adapter;
 168
 169         tp_init(adapter, p, tp_clk);
 170         writel(F_TP_RESET, adapter->regs +  A_TP_RESET);
 171         return 0;
 172 }