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) &
  55              (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC)) != BCMA_IOCTL_CLK)
  56                 return false;
  57         if (bgmac_idm_read(bgmac, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
  58                 return false;
  59         return true;
  60 }
  61
  62 static void platform_bgmac_clk_enable(struct bgmac *bgmac, u32 flags)
  63 {
  64         bgmac_idm_write(bgmac, BCMA_IOCTL,
  65                         (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC | flags));
  66         bgmac_idm_read(bgmac, BCMA_IOCTL);
  67
  68         bgmac_idm_write(bgmac, BCMA_RESET_CTL, 0);
  69         bgmac_idm_read(bgmac, BCMA_RESET_CTL);
  70         udelay(1);
  71
  72         bgmac_idm_write(bgmac, BCMA_IOCTL, (BCMA_IOCTL_CLK | flags));
  73         bgmac_idm_read(bgmac, BCMA_IOCTL);
  74         udelay(1);
  75 }
  76
  77 static void platform_bgmac_cco_ctl_maskset(struct bgmac *bgmac, u32 offset,
  78                                            u32 mask, u32 set)
  79 {
  80         /* This shouldn't be encountered */
  81         WARN_ON(1);
  82 }
  83
  84 static u32 platform_bgmac_get_bus_clock(struct bgmac *bgmac)
  85 {
  86         /* This shouldn't be encountered */
  87         WARN_ON(1);
  88
  89         return 0;
  90 }
  91
  92 static void platform_bgmac_cmn_maskset32(struct bgmac *bgmac, u16 offset,
  93                                          u32 mask, u32 set)
  94 {
  95         /* This shouldn't be encountered */
  96         WARN_ON(1);
  97 }
  98
  99 static void bgmac_nicpm_speed_set(struct net_device *net_dev)
 100 {
 101         struct bgmac *bgmac = netdev_priv(net_dev);
 102         u32 val;
 103
 104         if (!bgmac->plat.nicpm_base)
 105                 return;
 106
 107         val = NICPM_IOMUX_CTRL_INIT_VAL;
 108         switch (bgmac->net_dev->phydev->speed) {
 109         default:
 110                 netdev_err(net_dev, "Unsupported speed. Defaulting to 1000Mb\n");
 111         case SPEED_1000:
 112                 val |= NICPM_IOMUX_CTRL_SPD_1000M << NICPM_IOMUX_CTRL_SPD_SHIFT;
 113                 break;
 114         case SPEED_100:
 115                 val |= NICPM_IOMUX_CTRL_SPD_100M << NICPM_IOMUX_CTRL_SPD_SHIFT;
 116                 break;
 117         case SPEED_10:
 118                 val |= NICPM_IOMUX_CTRL_SPD_10M << NICPM_IOMUX_CTRL_SPD_SHIFT;
 119                 break;
 120         }
 121
 122         writel(val, bgmac->plat.nicpm_base + NICPM_IOMUX_CTRL);
 123
 124         bgmac_adjust_link(bgmac->net_dev);
 125 }
 126
 127 static int platform_phy_connect(struct bgmac *bgmac)
 128 {
 129         struct phy_device *phy_dev;
 130
 131         if (bgmac->plat.nicpm_base)
 132                 phy_dev = of_phy_get_and_connect(bgmac->net_dev,
 133                                                  bgmac->dev->of_node,
 134                                                  bgmac_nicpm_speed_set);
 135         else
 136                 phy_dev = of_phy_get_and_connect(bgmac->net_dev,
 137                                                  bgmac->dev->of_node,
 138                                                  bgmac_adjust_link);
 139         if (!phy_dev) {
 140                 dev_err(bgmac->dev, "PHY connection failed\n");
 141                 return -ENODEV;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static int bgmac_probe(struct platform_device *pdev)
 148 {
 149         struct device_node *np = pdev->dev.of_node;
 150         struct bgmac *bgmac;
 151         struct resource *regs;
 152         const u8 *mac_addr;
 153
 154         bgmac = devm_kzalloc(&pdev->dev, sizeof(*bgmac), GFP_KERNEL);
 155         if (!bgmac)
 156                 return -ENOMEM;
 157
 158         platform_set_drvdata(pdev, bgmac);
 159
 160         /* Set the features of the 4707 family */
 161         bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
 162         bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
 163         bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4;
 164         bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP;
 165         bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP;
 166
 167         bgmac->dev = &pdev->dev;
 168         bgmac->dma_dev = &pdev->dev;
 169
 170         mac_addr = of_get_mac_address(np);
 171         if (mac_addr)
 172                 ether_addr_copy(bgmac->mac_addr, mac_addr);
 173         else
 174                 dev_warn(&pdev->dev, "MAC address not present in device tree\n");
 175
 176         bgmac->irq = platform_get_irq(pdev, 0);
 177         if (bgmac->irq < 0) {
 178                 dev_err(&pdev->dev, "Unable to obtain IRQ\n");
 179                 return bgmac->irq;
 180         }
 181
 182         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "amac_base");
 183         if (!regs) {
 184                 dev_err(&pdev->dev, "Unable to obtain base resource\n");
 185                 return -EINVAL;
 186         }
 187
 188         bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
 189         if (IS_ERR(bgmac->plat.base))
 190                 return PTR_ERR(bgmac->plat.base);
 191
 192         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
 193         if (!regs) {
 194                 dev_err(&pdev->dev, "Unable to obtain idm resource\n");
 195                 return -EINVAL;
 196         }
 197
 198         bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
 199         if (IS_ERR(bgmac->plat.idm_base))
 200                 return PTR_ERR(bgmac->plat.idm_base);
 201
 202         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base");
 203         if (regs) {
 204                 bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev,
 205                                                                regs);
 206                 if (IS_ERR(bgmac->plat.nicpm_base))
 207                         return PTR_ERR(bgmac->plat.nicpm_base);
 208         }
 209
 210         bgmac->read = platform_bgmac_read;
 211         bgmac->write = platform_bgmac_write;
 212         bgmac->idm_read = platform_bgmac_idm_read;
 213         bgmac->idm_write = platform_bgmac_idm_write;
 214         bgmac->clk_enabled = platform_bgmac_clk_enabled;
 215         bgmac->clk_enable = platform_bgmac_clk_enable;
 216         bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset;
 217         bgmac->get_bus_clock = platform_bgmac_get_bus_clock;
 218         bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32;
 219         if (of_parse_phandle(np, "phy-handle", 0)) {
 220                 bgmac->phy_connect = platform_phy_connect;
 221         } else {
 222                 bgmac->phy_connect = bgmac_phy_connect_direct;
 223                 bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
 224         }
 225
 226         return bgmac_enet_probe(bgmac);
 227 }
 228
 229 static int bgmac_remove(struct platform_device *pdev)
 230 {
 231         struct bgmac *bgmac = platform_get_drvdata(pdev);
 232
 233         bgmac_enet_remove(bgmac);
 234
 235         return 0;
 236 }
 237
 238 static const struct of_device_id bgmac_of_enet_match[] = {
 239         {.compatible = "brcm,amac",},
 240         {.compatible = "brcm,nsp-amac",},
 241         {.compatible = "brcm,ns2-amac",},
 242         {},
 243 };
 244
 245 MODULE_DEVICE_TABLE(of, bgmac_of_enet_match);
 246
 247 static struct platform_driver bgmac_enet_driver = {
 248         .driver = {
 249                 .name  = "bgmac-enet",
 250                 .of_match_table = bgmac_of_enet_match,
 251         },
 252         .probe = bgmac_probe,
 253         .remove = bgmac_remove,
 254 };
 255
 256 module_platform_driver(bgmac_enet_driver);
 257 MODULE_LICENSE("GPL");