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"); 267