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_PADRING_CFG 0x00000004 25 #define NICPM_IOMUX_CTRL 0x00000008 26 27 #define NICPM_PADRING_CFG_INIT_VAL 0x74000000 28 #define NICPM_IOMUX_CTRL_INIT_VAL_AX 0x21880000 29 30 #define NICPM_IOMUX_CTRL_INIT_VAL 0x3196e000 31 #define NICPM_IOMUX_CTRL_SPD_SHIFT 10 32 #define NICPM_IOMUX_CTRL_SPD_10M 0 33 #define NICPM_IOMUX_CTRL_SPD_100M 1 34 #define NICPM_IOMUX_CTRL_SPD_1000M 2 35 36 static u32 platform_bgmac_read(struct bgmac *bgmac, u16 offset) 37 { 38 return readl(bgmac->plat.base + offset); 39 } 40 41 static void platform_bgmac_write(struct bgmac *bgmac, u16 offset, u32 value) 42 { 43 writel(value, bgmac->plat.base + offset); 44 } 45 46 static u32 platform_bgmac_idm_read(struct bgmac *bgmac, u16 offset) 47 { 48 return readl(bgmac->plat.idm_base + offset); 49 } 50 51 static void platform_bgmac_idm_write(struct bgmac *bgmac, u16 offset, u32 value) 52 { 53 writel(value, bgmac->plat.idm_base + offset); 54 } 55 56 static bool platform_bgmac_clk_enabled(struct bgmac *bgmac) 57 { 58 if (!bgmac->plat.idm_base) 59 return true; 60 61 if ((bgmac_idm_read(bgmac, BCMA_IOCTL) & BGMAC_CLK_EN) != BGMAC_CLK_EN) 62 return false; 63 if (bgmac_idm_read(bgmac, BCMA_RESET_CTL) & BCMA_RESET_CTL_RESET) 64 return false; 65 return true; 66 } 67 68 static void platform_bgmac_clk_enable(struct bgmac *bgmac, u32 flags) 69 { 70 u32 val; 71 72 if (!bgmac->plat.idm_base) 73 return; 74 75 /* The Reset Control register only contains a single bit to show if the 76 * controller is currently in reset. Do a sanity check here, just in 77 * case the bootloader happened to leave the device in reset. 78 */ 79 val = bgmac_idm_read(bgmac, BCMA_RESET_CTL); 80 if (val) { 81 bgmac_idm_write(bgmac, BCMA_RESET_CTL, 0); 82 bgmac_idm_read(bgmac, BCMA_RESET_CTL); 83 udelay(1); 84 } 85 86 val = bgmac_idm_read(bgmac, BCMA_IOCTL); 87 /* Some bits of BCMA_IOCTL set by HW/ATF and should not change */ 88 val |= flags & ~(BGMAC_AWCACHE | BGMAC_ARCACHE | BGMAC_AWUSER | 89 BGMAC_ARUSER); 90 val |= BGMAC_CLK_EN; 91 bgmac_idm_write(bgmac, BCMA_IOCTL, val); 92 bgmac_idm_read(bgmac, BCMA_IOCTL); 93 udelay(1); 94 } 95 96 static void platform_bgmac_cco_ctl_maskset(struct bgmac *bgmac, u32 offset, 97 u32 mask, u32 set) 98 { 99 /* This shouldn't be encountered */ 100 WARN_ON(1); 101 } 102 103 static u32 platform_bgmac_get_bus_clock(struct bgmac *bgmac) 104 { 105 /* This shouldn't be encountered */ 106 WARN_ON(1); 107 108 return 0; 109 } 110 111 static void platform_bgmac_cmn_maskset32(struct bgmac *bgmac, u16 offset, 112 u32 mask, u32 set) 113 { 114 /* This shouldn't be encountered */ 115 WARN_ON(1); 116 } 117 118 static void bgmac_nicpm_speed_set(struct net_device *net_dev) 119 { 120 struct bgmac *bgmac = netdev_priv(net_dev); 121 u32 val; 122 123 if (!bgmac->plat.nicpm_base) 124 return; 125 126 /* SET RGMII IO CONFIG */ 127 writel(NICPM_PADRING_CFG_INIT_VAL, 128 bgmac->plat.nicpm_base + NICPM_PADRING_CFG); 129 130 val = NICPM_IOMUX_CTRL_INIT_VAL; 131 switch (bgmac->net_dev->phydev->speed) { 132 default: 133 netdev_err(net_dev, "Unsupported speed. Defaulting to 1000Mb\n"); 134 fallthrough; 135 case SPEED_1000: 136 val |= NICPM_IOMUX_CTRL_SPD_1000M << NICPM_IOMUX_CTRL_SPD_SHIFT; 137 break; 138 case SPEED_100: 139 val |= NICPM_IOMUX_CTRL_SPD_100M << NICPM_IOMUX_CTRL_SPD_SHIFT; 140 break; 141 case SPEED_10: 142 val |= NICPM_IOMUX_CTRL_SPD_10M << NICPM_IOMUX_CTRL_SPD_SHIFT; 143 break; 144 } 145 146 writel(val, bgmac->plat.nicpm_base + NICPM_IOMUX_CTRL); 147 148 bgmac_adjust_link(bgmac->net_dev); 149 } 150 151 static int platform_phy_connect(struct bgmac *bgmac) 152 { 153 struct phy_device *phy_dev; 154 155 if (bgmac->plat.nicpm_base) 156 phy_dev = of_phy_get_and_connect(bgmac->net_dev, 157 bgmac->dev->of_node, 158 bgmac_nicpm_speed_set); 159 else 160 phy_dev = of_phy_get_and_connect(bgmac->net_dev, 161 bgmac->dev->of_node, 162 bgmac_adjust_link); 163 if (!phy_dev) { 164 dev_err(bgmac->dev, "PHY connection failed\n"); 165 return -ENODEV; 166 } 167 168 return 0; 169 } 170 171 static int bgmac_probe(struct platform_device *pdev) 172 { 173 struct device_node *np = pdev->dev.of_node; 174 struct bgmac *bgmac; 175 struct resource *regs; 176 int ret; 177 178 bgmac = bgmac_alloc(&pdev->dev); 179 if (!bgmac) 180 return -ENOMEM; 181 182 platform_set_drvdata(pdev, bgmac); 183 184 /* Set the features of the 4707 family */ 185 bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST; 186 bgmac->feature_flags |= BGMAC_FEAT_NO_RESET; 187 bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4; 188 bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP; 189 bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP; 190 bgmac->feature_flags |= BGMAC_FEAT_IDM_MASK; 191 192 bgmac->dev = &pdev->dev; 193 bgmac->dma_dev = &pdev->dev; 194 195 ret = of_get_ethdev_address(np, bgmac->net_dev); 196 if (ret == -EPROBE_DEFER) 197 return ret; 198 199 if (ret) 200 dev_warn(&pdev->dev, 201 "MAC address not present in device tree\n"); 202 203 bgmac->irq = platform_get_irq(pdev, 0); 204 if (bgmac->irq < 0) 205 return bgmac->irq; 206 207 bgmac->plat.base = 208 devm_platform_ioremap_resource_byname(pdev, "amac_base"); 209 if (IS_ERR(bgmac->plat.base)) 210 return PTR_ERR(bgmac->plat.base); 211 212 /* The idm_base resource is optional for some platforms */ 213 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "idm_base"); 214 if (regs) { 215 bgmac->plat.idm_base = devm_ioremap_resource(&pdev->dev, regs); 216 if (IS_ERR(bgmac->plat.idm_base)) 217 return PTR_ERR(bgmac->plat.idm_base); 218 bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK; 219 } 220 221 /* The nicpm_base resource is optional for some platforms */ 222 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base"); 223 if (regs) { 224 bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev, 225 regs); 226 if (IS_ERR(bgmac->plat.nicpm_base)) 227 return PTR_ERR(bgmac->plat.nicpm_base); 228 } 229 230 bgmac->read = platform_bgmac_read; 231 bgmac->write = platform_bgmac_write; 232 bgmac->idm_read = platform_bgmac_idm_read; 233 bgmac->idm_write = platform_bgmac_idm_write; 234 bgmac->clk_enabled = platform_bgmac_clk_enabled; 235 bgmac->clk_enable = platform_bgmac_clk_enable; 236 bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset; 237 bgmac->get_bus_clock = platform_bgmac_get_bus_clock; 238 bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32; 239 if (of_parse_phandle(np, "phy-handle", 0)) { 240 bgmac->phy_connect = platform_phy_connect; 241 } else { 242 bgmac->phy_connect = bgmac_phy_connect_direct; 243 bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500; 244 } 245 246 return bgmac_enet_probe(bgmac); 247 } 248 249 static void bgmac_remove(struct platform_device *pdev) 250 { 251 struct bgmac *bgmac = platform_get_drvdata(pdev); 252 253 bgmac_enet_remove(bgmac); 254 } 255 256 #ifdef CONFIG_PM 257 static int bgmac_suspend(struct device *dev) 258 { 259 struct bgmac *bgmac = dev_get_drvdata(dev); 260 261 return bgmac_enet_suspend(bgmac); 262 } 263 264 static int bgmac_resume(struct device *dev) 265 { 266 struct bgmac *bgmac = dev_get_drvdata(dev); 267 268 return bgmac_enet_resume(bgmac); 269 } 270 271 static const struct dev_pm_ops bgmac_pm_ops = { 272 .suspend = bgmac_suspend, 273 .resume = bgmac_resume 274 }; 275 276 #define BGMAC_PM_OPS (&bgmac_pm_ops) 277 #else 278 #define BGMAC_PM_OPS NULL 279 #endif /* CONFIG_PM */ 280 281 static const struct of_device_id bgmac_of_enet_match[] = { 282 {.compatible = "brcm,amac",}, 283 {.compatible = "brcm,nsp-amac",}, 284 {.compatible = "brcm,ns2-amac",}, 285 {}, 286 }; 287 288 MODULE_DEVICE_TABLE(of, bgmac_of_enet_match); 289 290 static struct platform_driver bgmac_enet_driver = { 291 .driver = { 292 .name = "bgmac-enet", 293 .of_match_table = bgmac_of_enet_match, 294 .pm = BGMAC_PM_OPS 295 }, 296 .probe = bgmac_probe, 297 .remove_new = bgmac_remove, 298 }; 299 300 module_platform_driver(bgmac_enet_driver); 301 MODULE_LICENSE("GPL"); 302