drivers/net/stmmac/dwmac1000_core.c

   1 /*******************************************************************************
   2   This is the driver for the GMAC on-chip Ethernet controller for ST SoCs.
   3   DWC Ether MAC 10/100/1000 Universal version 3.41a  has been used for
   4   developing this code.
   5
   6   This only implements the mac core functions for this chip.
   7
   8   Copyright (C) 2007-2009  STMicroelectronics Ltd
   9
  10   This program is free software; you can redistribute it and/or modify it
  11   under the terms and conditions of the GNU General Public License,
  12   version 2, as published by the Free Software Foundation.
  13
  14   This program is distributed in the hope it will be useful, but WITHOUT
  15   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17   more details.
  18
  19   You should have received a copy of the GNU General Public License along with
  20   this program; if not, write to the Free Software Foundation, Inc.,
  21   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  22
  23   The full GNU General Public License is included in this distribution in
  24   the file called "COPYING".
  25
  26   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  27 *******************************************************************************/
  28
  29 #include <linux/crc32.h>
  30 #include <linux/slab.h>
  31 #include "dwmac1000.h"
  32
  33 static void dwmac1000_core_init(void __iomem *ioaddr)
  34 {
  35         u32 value = readl(ioaddr + GMAC_CONTROL);
  36         value |= GMAC_CORE_INIT;
  37         writel(value, ioaddr + GMAC_CONTROL);
  38
  39         /* STBus Bridge Configuration */
  40         /*writel(0xc5608, ioaddr + 0x00007000);*/
  41
  42         /* Freeze MMC counters */
  43         writel(0x8, ioaddr + GMAC_MMC_CTRL);
  44         /* Mask GMAC interrupts */
  45         writel(0x207, ioaddr + GMAC_INT_MASK);
  46
  47 #ifdef STMMAC_VLAN_TAG_USED
  48         /* Tag detection without filtering */
  49         writel(0x0, ioaddr + GMAC_VLAN_TAG);
  50 #endif
  51 }
  52
  53 static int dwmac1000_rx_coe_supported(void __iomem *ioaddr)
  54 {
  55         u32 value = readl(ioaddr + GMAC_CONTROL);
  56
  57         value |= GMAC_CONTROL_IPC;
  58         writel(value, ioaddr + GMAC_CONTROL);
  59
  60         value = readl(ioaddr + GMAC_CONTROL);
  61
  62         return !!(value & GMAC_CONTROL_IPC);
  63 }
  64
  65 static void dwmac1000_dump_regs(void __iomem *ioaddr)
  66 {
  67         int i;
  68         pr_info("\tDWMAC1000 regs (base addr = 0x%p)\n", ioaddr);
  69
  70         for (i = 0; i < 55; i++) {
  71                 int offset = i * 4;
  72                 pr_info("\tReg No. %d (offset 0x%x): 0x%08x\n", i,
  73                         offset, readl(ioaddr + offset));
  74         }
  75 }
  76
  77 static void dwmac1000_set_umac_addr(void __iomem *ioaddr, unsigned char *addr,
  78                                 unsigned int reg_n)
  79 {
  80         stmmac_set_mac_addr(ioaddr, addr, GMAC_ADDR_HIGH(reg_n),
  81                                 GMAC_ADDR_LOW(reg_n));
  82 }
  83
  84 static void dwmac1000_get_umac_addr(void __iomem *ioaddr, unsigned char *addr,
  85                                 unsigned int reg_n)
  86 {
  87         stmmac_get_mac_addr(ioaddr, addr, GMAC_ADDR_HIGH(reg_n),
  88                                 GMAC_ADDR_LOW(reg_n));
  89 }
  90
  91 static void dwmac1000_set_filter(struct net_device *dev)
  92 {
  93         void __iomem *ioaddr = (void __iomem *) dev->base_addr;
  94         unsigned int value = 0;
  95
  96         CHIP_DBG(KERN_INFO "%s: # mcasts %d, # unicast %d\n",
  97                  __func__, netdev_mc_count(dev), netdev_uc_count(dev));
  98
  99         if (dev->flags & IFF_PROMISC)
 100                 value = GMAC_FRAME_FILTER_PR;
 101         else if ((netdev_mc_count(dev) > HASH_TABLE_SIZE)
 102                    || (dev->flags & IFF_ALLMULTI)) {
 103                 value = GMAC_FRAME_FILTER_PM;   /* pass all multi */
 104                 writel(0xffffffff, ioaddr + GMAC_HASH_HIGH);
 105                 writel(0xffffffff, ioaddr + GMAC_HASH_LOW);
 106         } else if (!netdev_mc_empty(dev)) {
 107                 u32 mc_filter[2];
 108                 struct netdev_hw_addr *ha;
 109
 110                 /* Hash filter for multicast */
 111                 value = GMAC_FRAME_FILTER_HMC;
 112
 113                 memset(mc_filter, 0, sizeof(mc_filter));
 114                 netdev_for_each_mc_addr(ha, dev) {
 115                         /* The upper 6 bits of the calculated CRC are used to
 116                            index the contens of the hash table */
 117                         int bit_nr =
 118                             bitrev32(~crc32_le(~0, ha->addr, 6)) >> 26;
 119                         /* The most significant bit determines the register to
 120                          * use (H/L) while the other 5 bits determine the bit
 121                          * within the register. */
 122                         mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
 123                 }
 124                 writel(mc_filter[0], ioaddr + GMAC_HASH_LOW);
 125                 writel(mc_filter[1], ioaddr + GMAC_HASH_HIGH);
 126         }
 127
 128         /* Handle multiple unicast addresses (perfect filtering)*/
 129         if (netdev_uc_count(dev) > GMAC_MAX_UNICAST_ADDRESSES)
 130                 /* Switch to promiscuous mode is more than 16 addrs
 131                    are required */
 132                 value |= GMAC_FRAME_FILTER_PR;
 133         else {
 134                 int reg = 1;
 135                 struct netdev_hw_addr *ha;
 136
 137                 netdev_for_each_uc_addr(ha, dev) {
 138                         dwmac1000_set_umac_addr(ioaddr, ha->addr, reg);
 139                         reg++;
 140                 }
 141         }
 142
 143 #ifdef FRAME_FILTER_DEBUG
 144         /* Enable Receive all mode (to debug filtering_fail errors) */
 145         value |= GMAC_FRAME_FILTER_RA;
 146 #endif
 147         writel(value, ioaddr + GMAC_FRAME_FILTER);
 148
 149         CHIP_DBG(KERN_INFO "\tFrame Filter reg: 0x%08x\n\tHash regs: "
 150             "HI 0x%08x, LO 0x%08x\n", readl(ioaddr + GMAC_FRAME_FILTER),
 151             readl(ioaddr + GMAC_HASH_HIGH), readl(ioaddr + GMAC_HASH_LOW));
 152 }
 153
 154 static void dwmac1000_flow_ctrl(void __iomem *ioaddr, unsigned int duplex,
 155                            unsigned int fc, unsigned int pause_time)
 156 {
 157         unsigned int flow = 0;
 158
 159         CHIP_DBG(KERN_DEBUG "GMAC Flow-Control:\n");
 160         if (fc & FLOW_RX) {
 161                 CHIP_DBG(KERN_DEBUG "\tReceive Flow-Control ON\n");
 162                 flow |= GMAC_FLOW_CTRL_RFE;
 163         }
 164         if (fc & FLOW_TX) {
 165                 CHIP_DBG(KERN_DEBUG "\tTransmit Flow-Control ON\n");
 166                 flow |= GMAC_FLOW_CTRL_TFE;
 167         }
 168
 169         if (duplex) {
 170                 CHIP_DBG(KERN_DEBUG "\tduplex mode: PAUSE %d\n", pause_time);
 171                 flow |= (pause_time << GMAC_FLOW_CTRL_PT_SHIFT);
 172         }
 173
 174         writel(flow, ioaddr + GMAC_FLOW_CTRL);
 175 }
 176
 177 static void dwmac1000_pmt(void __iomem *ioaddr, unsigned long mode)
 178 {
 179         unsigned int pmt = 0;
 180
 181         if (mode == WAKE_MAGIC) {
 182                 CHIP_DBG(KERN_DEBUG "GMAC: WOL Magic frame\n");
 183                 pmt |= power_down | magic_pkt_en;
 184         } else if (mode == WAKE_UCAST) {
 185                 CHIP_DBG(KERN_DEBUG "GMAC: WOL on global unicast\n");
 186                 pmt |= global_unicast;
 187         }
 188
 189         writel(pmt, ioaddr + GMAC_PMT);
 190 }
 191
 192
 193 static void dwmac1000_irq_status(void __iomem *ioaddr)
 194 {
 195         u32 intr_status = readl(ioaddr + GMAC_INT_STATUS);
 196
 197         /* Not used events (e.g. MMC interrupts) are not handled. */
 198         if ((intr_status & mmc_tx_irq))
 199                 CHIP_DBG(KERN_DEBUG "GMAC: MMC tx interrupt: 0x%08x\n",
 200                     readl(ioaddr + GMAC_MMC_TX_INTR));
 201         if (unlikely(intr_status & mmc_rx_irq))
 202                 CHIP_DBG(KERN_DEBUG "GMAC: MMC rx interrupt: 0x%08x\n",
 203                     readl(ioaddr + GMAC_MMC_RX_INTR));
 204         if (unlikely(intr_status & mmc_rx_csum_offload_irq))
 205                 CHIP_DBG(KERN_DEBUG "GMAC: MMC rx csum offload: 0x%08x\n",
 206                     readl(ioaddr + GMAC_MMC_RX_CSUM_OFFLOAD));
 207         if (unlikely(intr_status & pmt_irq)) {
 208                 CHIP_DBG(KERN_DEBUG "GMAC: received Magic frame\n");
 209                 /* clear the PMT bits 5 and 6 by reading the PMT
 210                  * status register. */
 211                 readl(ioaddr + GMAC_PMT);
 212         }
 213 }
 214
 215 static const struct stmmac_ops dwmac1000_ops = {
 216         .core_init = dwmac1000_core_init,
 217         .rx_coe = dwmac1000_rx_coe_supported,
 218         .dump_regs = dwmac1000_dump_regs,
 219         .host_irq_status = dwmac1000_irq_status,
 220         .set_filter = dwmac1000_set_filter,
 221         .flow_ctrl = dwmac1000_flow_ctrl,
 222         .pmt = dwmac1000_pmt,
 223         .set_umac_addr = dwmac1000_set_umac_addr,
 224         .get_umac_addr = dwmac1000_get_umac_addr,
 225 };
 226
 227 struct mac_device_info *dwmac1000_setup(void __iomem *ioaddr)
 228 {
 229         struct mac_device_info *mac;
 230         u32 uid = readl(ioaddr + GMAC_VERSION);
 231
 232         pr_info("\tDWMAC1000 - user ID: 0x%x, Synopsys ID: 0x%x\n",
 233                 ((uid & 0x0000ff00) >> 8), (uid & 0x000000ff));
 234
 235         mac = kzalloc(sizeof(const struct mac_device_info), GFP_KERNEL);
 236         if (!mac)
 237                 return NULL;
 238
 239         mac->mac = &dwmac1000_ops;
 240         mac->dma = &dwmac1000_dma_ops;
 241
 242         mac->link.port = GMAC_CONTROL_PS;
 243         mac->link.duplex = GMAC_CONTROL_DM;
 244         mac->link.speed = GMAC_CONTROL_FES;
 245         mac->mii.addr = GMAC_MII_ADDR;
 246         mac->mii.data = GMAC_MII_DATA;
 247
 248         return mac;
 249 }