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
platform_bgmac_read(struct bgmac * bgmac,u16 offset)36 static u32 platform_bgmac_read(struct bgmac *bgmac, u16 offset)
37 {
38 return readl(bgmac->plat.base + offset);
39 }
40
platform_bgmac_write(struct bgmac * bgmac,u16 offset,u32 value)41 static void platform_bgmac_write(struct bgmac *bgmac, u16 offset, u32 value)
42 {
43 writel(value, bgmac->plat.base + offset);
44 }
45
platform_bgmac_idm_read(struct bgmac * bgmac,u16 offset)46 static u32 platform_bgmac_idm_read(struct bgmac *bgmac, u16 offset)
47 {
48 return readl(bgmac->plat.idm_base + offset);
49 }
50
platform_bgmac_idm_write(struct bgmac * bgmac,u16 offset,u32 value)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
platform_bgmac_clk_enabled(struct bgmac * bgmac)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
platform_bgmac_clk_enable(struct bgmac * bgmac,u32 flags)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
platform_bgmac_cco_ctl_maskset(struct bgmac * bgmac,u32 offset,u32 mask,u32 set)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
platform_bgmac_get_bus_clock(struct bgmac * bgmac)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
platform_bgmac_cmn_maskset32(struct bgmac * bgmac,u16 offset,u32 mask,u32 set)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
bgmac_nicpm_speed_set(struct net_device * net_dev)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
platform_phy_connect(struct bgmac * bgmac)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
bgmac_probe(struct platform_device * pdev)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
bgmac_remove(struct platform_device * pdev)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
bgmac_suspend(struct device * dev)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
bgmac_resume(struct device * dev)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_DESCRIPTION("Broadcom iProc GBit platform interface driver");
302 MODULE_LICENSE("GPL");
303