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/etherdevice.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_net.h>
  20 #include "bgmac.h"
  21
  22 static u32 platform_bgmac_read(struct bgmac *bgmac, u16 offset)
  23 {
  24         return readl(bgmac->plat.base + offset);
  25 }
  26
  27 static void platform_bgmac_write(struct bgmac *bgmac, u16 offset, u32 value)
  28 {
  29         writel(value, bgmac->plat.base + offset);
  30 }
  31
  32 static u32 platform_bgmac_idm_read(struct bgmac *bgmac, u16 offset)
  33 {
  34         return readl(bgmac->plat.idm_base + offset);
  35 }
  36
  37 static void platform_bgmac_idm_write(struct bgmac *bgmac, u16 offset, u32 value)
  38 {
  39         return writel(value, bgmac->plat.idm_base + offset);
  40 }
  41
  42 static bool platform_bgmac_clk_enabled(struct bgmac *bgmac)
  43 {
  44         if ((bgmac_idm_read(bgmac, BCMA_IOCTL) &
  45              (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC)) != BCMA_IOCTL_CLK)
  46                 return false;
  47         if (bgmac_idm_read(bgmac, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET)
  48                 return false;
  49         return true;
  50 }
  51
  52 static void platform_bgmac_clk_enable(struct bgmac *bgmac, u32 flags)
  53 {
  54         bgmac_idm_write(bgmac, BCMA_IOCTL,
  55                         (BCMA_IOCTL_CLK | BCMA_IOCTL_FGC | flags));
  56         bgmac_idm_read(bgmac, BCMA_IOCTL);
  57
  58         bgmac_idm_write(bgmac, BCMA_RESET_CTL, 0);
  59         bgmac_idm_read(bgmac, BCMA_RESET_CTL);
  60         udelay(1);
  61
  62         bgmac_idm_write(bgmac, BCMA_IOCTL, (BCMA_IOCTL_CLK | flags));
  63         bgmac_idm_read(bgmac, BCMA_IOCTL);
  64         udelay(1);
  65 }
  66
  67 static void platform_bgmac_cco_ctl_maskset(struct bgmac *bgmac, u32 offset,
  68                                            u32 mask, u32 set)
  69 {
  70         /* This shouldn't be encountered */
  71         WARN_ON(1);
  72 }
  73
  74 static u32 platform_bgmac_get_bus_clock(struct bgmac *bgmac)
  75 {
  76         /* This shouldn't be encountered */
  77         WARN_ON(1);
  78
  79         return 0;
  80 }
  81
  82 static void platform_bgmac_cmn_maskset32(struct bgmac *bgmac, u16 offset,
  83                                          u32 mask, u32 set)
  84 {
  85         /* This shouldn't be encountered */
  86         WARN_ON(1);
  87 }
  88
  89 static int bgmac_probe(struct platform_device *pdev)
  90 {
  91         struct device_node *np = pdev->dev.of_node;
  92         struct bgmac *bgmac;
  93         struct resource *regs;
  94         const u8 *mac_addr;
  95
  96         bgmac = devm_kzalloc(&pdev->dev, sizeof(*bgmac), GFP_KERNEL);
  97         if (!bgmac)
  98                 return -ENOMEM;
  99
 100         platform_set_drvdata(pdev, bgmac);
 101
 102         /* Set the features of the 4707 family */
 103         bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
 104         bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
 105         bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
 106         bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4;
 107         bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP;
 108         bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP;
 109
 110         bgmac->dev = &pdev->dev;
 111         bgmac->dma_dev = &pdev->dev;
 112
 113         mac_addr = of_get_mac_address(np);
 114         if (mac_addr)
 115                 ether_addr_copy(bgmac->mac_addr, mac_addr);
 116         else
 117                 dev_warn(&pdev->dev, "MAC address not present in device tree\n");
 118
 119         bgmac->irq = platform_get_irq(pdev, 0);
 120         if (bgmac->irq < 0) {
 121                 dev_err(&pdev->dev, "Unable to obtain IRQ\n");
 122                 return bgmac->irq;
 123         }
 124
 125         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "amac_base");
 126         if (!regs) {
 127                 dev_err(&pdev->dev, "Unable to obtain base resource\n");
 128                 return -EINVAL;
 129         }
 130
 131         bgmac->plat.base = devm_ioremap_resource(&pdev->dev, regs);
 132         if (IS_ERR(bgmac->plat.base))
 133                 return PTR_ERR(bgmac->plat.base);
 134
 135         regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base");
 136         if (!regs) {
 137                 dev_err(&pdev->dev, "Unable to obtain idm resource\n");
 138                 return -EINVAL;
 139         }
 140
 141         bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs);
 142         if (IS_ERR(bgmac->plat.idm_base))
 143                 return PTR_ERR(bgmac->plat.idm_base);
 144
 145         bgmac->read = platform_bgmac_read;
 146         bgmac->write = platform_bgmac_write;
 147         bgmac->idm_read = platform_bgmac_idm_read;
 148         bgmac->idm_write = platform_bgmac_idm_write;
 149         bgmac->clk_enabled = platform_bgmac_clk_enabled;
 150         bgmac->clk_enable = platform_bgmac_clk_enable;
 151         bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset;
 152         bgmac->get_bus_clock = platform_bgmac_get_bus_clock;
 153         bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32;
 154
 155         return bgmac_enet_probe(bgmac);
 156 }
 157
 158 static int bgmac_remove(struct platform_device *pdev)
 159 {
 160         struct bgmac *bgmac = platform_get_drvdata(pdev);
 161
 162         bgmac_enet_remove(bgmac);
 163
 164         return 0;
 165 }
 166
 167 static const struct of_device_id bgmac_of_enet_match[] = {
 168         {.compatible = "brcm,amac",},
 169         {.compatible = "brcm,nsp-amac",},
 170         {},
 171 };
 172
 173 MODULE_DEVICE_TABLE(of, bgmac_of_enet_match);
 174
 175 static struct platform_driver bgmac_enet_driver = {
 176         .driver = {
 177                 .name  = "bgmac-enet",
 178                 .of_match_table = bgmac_of_enet_match,
 179         },
 180         .probe = bgmac_probe,
 181         .remove = bgmac_remove,
 182 };
 183
 184 module_platform_driver(bgmac_enet_driver);
 185 MODULE_LICENSE("GPL");