kernel/drivers/net/ethernet/samsung/sxgbe/sxgbe_mtl.c

   1 /* 10G controller driver for Samsung SoCs
   2  *
   3  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * Author: Siva Reddy Kallam <siva.kallam@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/io.h>
  16 #include <linux/errno.h>
  17 #include <linux/export.h>
  18 #include <linux/jiffies.h>
  19
  20 #include "sxgbe_mtl.h"
  21 #include "sxgbe_reg.h"
  22
  23 static void sxgbe_mtl_init(void __iomem *ioaddr, unsigned int etsalg,
  24                            unsigned int raa)
  25 {
  26         u32 reg_val;
  27
  28         reg_val = readl(ioaddr + SXGBE_MTL_OP_MODE_REG);
  29         reg_val &= ETS_RST;
  30
  31         /* ETS Algorith */
  32         switch (etsalg & SXGBE_MTL_OPMODE_ESTMASK) {
  33         case ETS_WRR:
  34                 reg_val &= ETS_WRR;
  35                 break;
  36         case ETS_WFQ:
  37                 reg_val |= ETS_WFQ;
  38                 break;
  39         case ETS_DWRR:
  40                 reg_val |= ETS_DWRR;
  41                 break;
  42         }
  43         writel(reg_val, ioaddr + SXGBE_MTL_OP_MODE_REG);
  44
  45         switch (raa & SXGBE_MTL_OPMODE_RAAMASK) {
  46         case RAA_SP:
  47                 reg_val &= RAA_SP;
  48                 break;
  49         case RAA_WSP:
  50                 reg_val |= RAA_WSP;
  51                 break;
  52         }
  53         writel(reg_val, ioaddr + SXGBE_MTL_OP_MODE_REG);
  54 }
  55
  56 /* For Dynamic DMA channel mapping for Rx queue */
  57 static void sxgbe_mtl_dma_dm_rxqueue(void __iomem *ioaddr)
  58 {
  59         writel(RX_QUEUE_DYNAMIC, ioaddr + SXGBE_MTL_RXQ_DMAMAP0_REG);
  60         writel(RX_QUEUE_DYNAMIC, ioaddr + SXGBE_MTL_RXQ_DMAMAP1_REG);
  61         writel(RX_QUEUE_DYNAMIC, ioaddr + SXGBE_MTL_RXQ_DMAMAP2_REG);
  62 }
  63
  64 static void sxgbe_mtl_set_txfifosize(void __iomem *ioaddr, int queue_num,
  65                                      int queue_fifo)
  66 {
  67         u32 fifo_bits, reg_val;
  68
  69         /* 0 means 256 bytes */
  70         fifo_bits = (queue_fifo / SXGBE_MTL_TX_FIFO_DIV) - 1;
  71         reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
  72         reg_val |= (fifo_bits << SXGBE_MTL_FIFO_LSHIFT);
  73         writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
  74 }
  75
  76 static void sxgbe_mtl_set_rxfifosize(void __iomem *ioaddr, int queue_num,
  77                                      int queue_fifo)
  78 {
  79         u32 fifo_bits, reg_val;
  80
  81         /* 0 means 256 bytes */
  82         fifo_bits = (queue_fifo / SXGBE_MTL_RX_FIFO_DIV)-1;
  83         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
  84         reg_val |= (fifo_bits << SXGBE_MTL_FIFO_LSHIFT);
  85         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
  86 }
  87
  88 static void sxgbe_mtl_enable_txqueue(void __iomem *ioaddr, int queue_num)
  89 {
  90         u32 reg_val;
  91
  92         reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
  93         reg_val |= SXGBE_MTL_ENABLE_QUEUE;
  94         writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
  95 }
  96
  97 static void sxgbe_mtl_disable_txqueue(void __iomem *ioaddr, int queue_num)
  98 {
  99         u32 reg_val;
 100
 101         reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
 102         reg_val &= ~SXGBE_MTL_ENABLE_QUEUE;
 103         writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
 104 }
 105
 106 static void sxgbe_mtl_fc_active(void __iomem *ioaddr, int queue_num,
 107                                 int threshold)
 108 {
 109         u32 reg_val;
 110
 111         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 112         reg_val &= ~(SXGBE_MTL_FCMASK << RX_FC_ACTIVE);
 113         reg_val |= (threshold << RX_FC_ACTIVE);
 114
 115         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 116 }
 117
 118 static void sxgbe_mtl_fc_enable(void __iomem *ioaddr, int queue_num)
 119 {
 120         u32 reg_val;
 121
 122         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 123         reg_val |= SXGBE_MTL_ENABLE_FC;
 124         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 125 }
 126
 127 static void sxgbe_mtl_fc_deactive(void __iomem *ioaddr, int queue_num,
 128                                   int threshold)
 129 {
 130         u32 reg_val;
 131
 132         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 133         reg_val &= ~(SXGBE_MTL_FCMASK << RX_FC_DEACTIVE);
 134         reg_val |= (threshold << RX_FC_DEACTIVE);
 135
 136         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 137 }
 138
 139 static void sxgbe_mtl_fep_enable(void __iomem *ioaddr, int queue_num)
 140 {
 141         u32 reg_val;
 142
 143         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 144         reg_val |= SXGBE_MTL_RXQ_OP_FEP;
 145
 146         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 147 }
 148
 149 static void sxgbe_mtl_fep_disable(void __iomem *ioaddr, int queue_num)
 150 {
 151         u32 reg_val;
 152
 153         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 154         reg_val &= ~(SXGBE_MTL_RXQ_OP_FEP);
 155
 156         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 157 }
 158
 159 static void sxgbe_mtl_fup_enable(void __iomem *ioaddr, int queue_num)
 160 {
 161         u32 reg_val;
 162
 163         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 164         reg_val |= SXGBE_MTL_RXQ_OP_FUP;
 165
 166         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 167 }
 168
 169 static void sxgbe_mtl_fup_disable(void __iomem *ioaddr, int queue_num)
 170 {
 171         u32 reg_val;
 172
 173         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 174         reg_val &= ~(SXGBE_MTL_RXQ_OP_FUP);
 175
 176         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 177 }
 178
 179
 180 static void sxgbe_set_tx_mtl_mode(void __iomem *ioaddr, int queue_num,
 181                                   int tx_mode)
 182 {
 183         u32 reg_val;
 184
 185         reg_val = readl(ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
 186         /* TX specific MTL mode settings */
 187         if (tx_mode == SXGBE_MTL_SFMODE) {
 188                 reg_val |= SXGBE_MTL_SFMODE;
 189         } else {
 190                 /* set the TTC values */
 191                 if (tx_mode <= 64)
 192                         reg_val |= MTL_CONTROL_TTC_64;
 193                 else if (tx_mode <= 96)
 194                         reg_val |= MTL_CONTROL_TTC_96;
 195                 else if (tx_mode <= 128)
 196                         reg_val |= MTL_CONTROL_TTC_128;
 197                 else if (tx_mode <= 192)
 198                         reg_val |= MTL_CONTROL_TTC_192;
 199                 else if (tx_mode <= 256)
 200                         reg_val |= MTL_CONTROL_TTC_256;
 201                 else if (tx_mode <= 384)
 202                         reg_val |= MTL_CONTROL_TTC_384;
 203                 else
 204                         reg_val |= MTL_CONTROL_TTC_512;
 205         }
 206
 207         /* write into TXQ operation register */
 208         writel(reg_val, ioaddr + SXGBE_MTL_TXQ_OPMODE_REG(queue_num));
 209 }
 210
 211 static void sxgbe_set_rx_mtl_mode(void __iomem *ioaddr, int queue_num,
 212                                   int rx_mode)
 213 {
 214         u32 reg_val;
 215
 216         reg_val = readl(ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 217         /* RX specific MTL mode settings */
 218         if (rx_mode == SXGBE_RX_MTL_SFMODE) {
 219                 reg_val |= SXGBE_RX_MTL_SFMODE;
 220         } else {
 221                 if (rx_mode <= 64)
 222                         reg_val |= MTL_CONTROL_RTC_64;
 223                 else if (rx_mode <= 96)
 224                         reg_val |= MTL_CONTROL_RTC_96;
 225                 else if (rx_mode <= 128)
 226                         reg_val |= MTL_CONTROL_RTC_128;
 227         }
 228
 229         /* write into RXQ operation register */
 230         writel(reg_val, ioaddr + SXGBE_MTL_RXQ_OPMODE_REG(queue_num));
 231 }
 232
 233 static const struct sxgbe_mtl_ops mtl_ops = {
 234         .mtl_set_txfifosize             = sxgbe_mtl_set_txfifosize,
 235         .mtl_set_rxfifosize             = sxgbe_mtl_set_rxfifosize,
 236         .mtl_enable_txqueue             = sxgbe_mtl_enable_txqueue,
 237         .mtl_disable_txqueue            = sxgbe_mtl_disable_txqueue,
 238         .mtl_dynamic_dma_rxqueue        = sxgbe_mtl_dma_dm_rxqueue,
 239         .set_tx_mtl_mode                = sxgbe_set_tx_mtl_mode,
 240         .set_rx_mtl_mode                = sxgbe_set_rx_mtl_mode,
 241         .mtl_init                       = sxgbe_mtl_init,
 242         .mtl_fc_active                  = sxgbe_mtl_fc_active,
 243         .mtl_fc_deactive                = sxgbe_mtl_fc_deactive,
 244         .mtl_fc_enable                  = sxgbe_mtl_fc_enable,
 245         .mtl_fep_enable                 = sxgbe_mtl_fep_enable,
 246         .mtl_fep_disable                = sxgbe_mtl_fep_disable,
 247         .mtl_fup_enable                 = sxgbe_mtl_fup_enable,
 248         .mtl_fup_disable                = sxgbe_mtl_fup_disable
 249 };
 250
 251 const struct sxgbe_mtl_ops *sxgbe_get_mtl_ops(void)
 252 {
 253         return &mtl_ops;
 254 }