drivers/net/ethernet/broadcom/bgmac-platform.c

   1 /*
   2  * Copyright (C) 2016 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation version 2.
   7  *
   8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   9  * kind, whether express or implied; without even the implied warranty
  10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #define pr_fmt(fmt)             KBUILD_MODNAME ": " fmt
  15
  16 #include <linux/bcma/bcma.h>
  17 #include <linux/brcmphy.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_mdio.h>
  21 #include <linux/of_net.h>
  22 #include "bgmac.h"
  23
  24 #define NICPM_IOMUX_CTRL                0x00000008
  25
  26 #define NICPM_IOMUX_CTRL_INIT_VAL       0x3196e000
  27 #define NICPM_IOMUX_CTRL_SPD_SHIFT      10
  28 #define NICPM_IOMUX_CTRL_SPD_10M        0
  29 #define NICPM_IOMUX_CTRL_SPD_100M       1
  30 #define NICPM_IOMUX_CTRL_SPD_1000M      2
  31
  32 static u32 platform_bgmac_read(struct bgmac *bgmac, u16 offset)
  33 {
  34         return readl(bgmac->plat.base + offset);
  35 }
  36
  37 static void platform_bgmac_write(struct bgmac *bgmac, u16 offset, u32 value)
  38 {
  39         writel(value, bgmac->plat.base + offset);
  40 }
  41
  42 static u32 platform_bgmac_idm_read(struct bgmac *bgmac, u16 offset)
  43 {
  44         return readl(bgmac->plat.idm_base + offset);
  45 }
  46
  47 static void platform_bgmac_idm_write(struct bgmac *bgmac, u16 offset, u32 value)
  48 {
  49         return writel(value, bgmac->plat.idm_base + offset);
  50 }
  51
  52 static bool platform_bgmac_clk_enabled(struct bgmac *bgmac)
  53 {
  54         if ((bgmac_idm_read(bgmac, BCMA_IOCTL) & BGMAC_CLK_EN) != BGMAC_CLK_EN)
  55                 return false;
  56         if (bgmac_idm_read(bgmac, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
  57                 return false;
  58         return true;
  59 }
  60
  61 static void platform_bgmac_clk_enable(struct bgmac *bgmac, u32 flags)
  62 {
  63         u32 val;
  64
  65         /* The Reset Control register only contains a single bit to show if the
  66          * controller is currently in reset.  Do a sanity check here, just in
  67          * case the bootloader happened to leave the device in reset.
  68          */
  69         val = bgmac_idm_read(bgmac, BCMA_RESET_CTL);
  70         if (val) {
  71                 bgmac_idm_write(bgmac, BCMA_RESET_CTL, 0);
  72                 bgmac_idm_read(bgmac, BCMA_RESET_CTL);
  73                 udelay(1);
  74         }
  75
  76         val = bgmac_idm_read(bgmac, BCMA_IOCTL);
  77         /* Some bits of BCMA_IOCTL set by HW/ATF and should not change */
  78         val |= flags & ~(BGMAC_AWCACHE | BGMAC_ARCACHE | BGMAC_AWUSER |
  79                          BGMAC_ARUSER);
  80         val |= BGMAC_CLK_EN;
  81         bgmac_idm_write(bgmac, BCMA_IOCTL, val);
  82         bgmac_idm_read(bgmac, BCMA_IOCTL);
  83         udelay(1);
  84 }
  85
  86 static void platform_bgmac_cco_ctl_maskset(struct bgmac *bgmac, u32 offset,
  87                                            u32 mask, u32 set)
  88 {
  89         /* This shouldn't be encountered */
  90         WARN_ON(1);
  91 }
  92
  93 static u32 platform_bgmac_get_bus_clock(struct bgmac *bgmac)
  94 {
  95         /* This shouldn't be encountered */
  96         WARN_ON(1);
  97
  98         return 0;
  99 }
 100
 101 static void platform_bgmac_cmn_maskset32(struct bgmac *bgmac, u16 offset,
 102                                          u32 mask, u32 set)
 103 {
 104         /* This shouldn't be encountered */
 105         WARN_ON(1);
 106 }
 107
 108 static void bgmac_nicpm_speed_set(struct net_device *net_dev)
 109 {
 110         struct bgmac *bgmac = netdev_priv(net_dev);
 111         u32 val;
 112
 113         if (!bgmac->plat.nicpm_base)
 114                 return;
 115
 116         val = NICPM_IOMUX_CTRL_INIT_VAL;
 117         switch (bgmac->net_dev->phydev->speed) {
 118         default:
 119                 netdev_err(net_dev, "Unsupported speed. Defaulting to 1000Mb\n");
 120         case SPEED_1000:
 121                 val |= NICPM_IOMUX_CTRL_SPD_1000M << NICPM_IOMUX_CTRL_SPD_SHIFT;
 122                 break;
 123         case SPEED_100:
 124                 val |= NICPM_IOMUX_CTRL_SPD_100M << NICPM_IOMUX_CTRL_SPD_SHIFT;
 125                 break;
 126         case SPEED_10:
 127                 val |= NICPM_IOMUX_CTRL_SPD_10M << NICPM_IOMUX_CTRL_SPD_SHIFT;
 128                 break;
 129         }
 130
 131         writel(val, bgmac->plat.nicpm_base + NICPM_IOMUX_CTRL);
 132
 133         bgmac_adjust_link(bgmac->net_dev);
 134 }
 135
 136 static int platform_phy_connect(struct bgmac *bgmac)
 137 {
 138         struct phy_device *phy_dev;
 139
 140         if (bgmac->plat.nicpm_base)
 141                 phy_dev = of_phy_get_and_connect(bgmac->net_dev,
 142                                                  bgmac->dev->of_node,
 143                                                  bgmac_nicpm_speed_set);
 144         else
 145                 phy_dev = of_phy_get_and_connect(bgmac->net_dev,
 146                                                  bgmac->dev->of_node,
 147                                                  bgmac_adjust_link);
 148         if (!phy_dev) {
 149                 dev_err(bgmac->dev, "PHY connection failed\n");
 150                 return -ENODEV;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int bgmac_probe(struct platform_device *pdev)
 157 {
 158         struct device_node *np = pdev->dev.of_node;
 159         struct bgmac *bgmac;
 160         struct resource *regs;
 161         const u8 *mac_addr;
 162
 163         bgmac = bgmac_alloc(&pdev->dev);
 164         if (!bgmac)
 165                 return -ENOMEM;
 166
 167         platform_set_drvdata(pdev, bgmac);
 168
 169         /* Set the features of the 4707 family */
 170         bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
 171         bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
 172         bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4;
 173         bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP;
 174         bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP;
 175
 176         bgmac->dev = &pdev->dev;
 177         bgmac->dma_dev = &pdev->dev;
 178
 179         mac_addr = of_get_mac_address(np);
 180         if (mac_addr)
 181                 ether_addr_copy(bgmac->net_dev->dev_addr, mac_addr);
 182         else
 183                 dev_warn(&pdev->dev, "MAC address not present in device tree\n");
 184
 185         bgmac->irq = platform_get_irq(pdev, 0);
 186         if (bgmac->irq < 0) {
 187                 dev_err(&pdev->dev, "Unable to obtain IRQ\n");
 188                 return bgmac->irq;
 189         }
 190
 191         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "amac_base");
 192         if (!regs) {
 193                 dev_err(&pdev->dev, "Unable to obtain base resource\n");
 194                 return -EINVAL;
 195         }
 196
 197         bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
 198         if (IS_ERR(bgmac->plat.base))
 199                 return PTR_ERR(bgmac->plat.base);
 200
 201         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
 202         if (!regs) {
 203                 dev_err(&pdev->dev, "Unable to obtain idm resource\n");
 204                 return -EINVAL;
 205         }
 206
 207         bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
 208         if (IS_ERR(bgmac->plat.idm_base))
 209                 return PTR_ERR(bgmac->plat.idm_base);
 210
 211         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base");
 212         if (regs) {
 213                 bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev,
 214                                                                regs);
 215                 if (IS_ERR(bgmac->plat.nicpm_base))
 216                         return PTR_ERR(bgmac->plat.nicpm_base);
 217         }
 218
 219         bgmac->read = platform_bgmac_read;
 220         bgmac->write = platform_bgmac_write;
 221         bgmac->idm_read = platform_bgmac_idm_read;
 222         bgmac->idm_write = platform_bgmac_idm_write;
 223         bgmac->clk_enabled = platform_bgmac_clk_enabled;
 224         bgmac->clk_enable = platform_bgmac_clk_enable;
 225         bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset;
 226         bgmac->get_bus_clock = platform_bgmac_get_bus_clock;
 227         bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32;
 228         if (of_parse_phandle(np, "phy-handle", 0)) {
 229                 bgmac->phy_connect = platform_phy_connect;
 230         } else {
 231                 bgmac->phy_connect = bgmac_phy_connect_direct;
 232                 bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
 233         }
 234
 235         return bgmac_enet_probe(bgmac);
 236 }
 237
 238 static int bgmac_remove(struct platform_device *pdev)
 239 {
 240         struct bgmac *bgmac = platform_get_drvdata(pdev);
 241
 242         bgmac_enet_remove(bgmac);
 243
 244         return 0;
 245 }
 246
 247 static const struct of_device_id bgmac_of_enet_match[] = {
 248         {.compatible = "brcm,amac",},
 249         {.compatible = "brcm,nsp-amac",},
 250         {.compatible = "brcm,ns2-amac",},
 251         {},
 252 };
 253
 254 MODULE_DEVICE_TABLE(of, bgmac_of_enet_match);
 255
 256 static struct platform_driver bgmac_enet_driver = {
 257         .driver = {
 258                 .name  = "bgmac-enet",
 259                 .of_match_table = bgmac_of_enet_match,
 260         },
 261         .probe = bgmac_probe,
 262         .remove = bgmac_remove,
 263 };
 264
 265 module_platform_driver(bgmac_enet_driver);
 266 MODULE_LICENSE("GPL");