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 	int ret;
176 
177 	bgmac = bgmac_alloc(&pdev->dev);
178 	if (!bgmac)
179 		return -ENOMEM;
180 
181 	platform_set_drvdata(pdev, bgmac);
182 
183 	/* Set the features of the 4707 family */
184 	bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
185 	bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
186 	bgmac->feature_flags |= BGMAC_FEAT_CMDCFG_SR_REV4;
187 	bgmac->feature_flags |= BGMAC_FEAT_TX_MASK_SETUP;
188 	bgmac->feature_flags |= BGMAC_FEAT_RX_MASK_SETUP;
189 	bgmac->feature_flags |= BGMAC_FEAT_IDM_MASK;
190 
191 	bgmac->dev = &pdev->dev;
192 	bgmac->dma_dev = &pdev->dev;
193 
194 	ret = of_get_mac_address(np, bgmac->net_dev->dev_addr);
195 	if (ret)
196 		dev_warn(&pdev->dev,
197 			 "MAC address not present in device tree\n");
198 
199 	bgmac->irq = platform_get_irq(pdev, 0);
200 	if (bgmac->irq < 0)
201 		return bgmac->irq;
202 
203 	bgmac->plat.base =
204 		devm_platform_ioremap_resource_byname(pdev, "amac_base");
205 	if (IS_ERR(bgmac->plat.base))
206 		return PTR_ERR(bgmac->plat.base);
207 
208 	bgmac->plat.idm_base = devm_platform_ioremap_resource_byname(pdev, "idm_base");
209 	if (IS_ERR(bgmac->plat.idm_base))
210 		return PTR_ERR(bgmac->plat.idm_base);
211 	else
212 		bgmac->feature_flags &= ~BGMAC_FEAT_IDM_MASK;
213 
214 	bgmac->plat.nicpm_base = devm_platform_ioremap_resource_byname(pdev, "nicpm_base");
215 	if (IS_ERR(bgmac->plat.nicpm_base))
216 		return PTR_ERR(bgmac->plat.nicpm_base);
217 
218 	bgmac->read = platform_bgmac_read;
219 	bgmac->write = platform_bgmac_write;
220 	bgmac->idm_read = platform_bgmac_idm_read;
221 	bgmac->idm_write = platform_bgmac_idm_write;
222 	bgmac->clk_enabled = platform_bgmac_clk_enabled;
223 	bgmac->clk_enable = platform_bgmac_clk_enable;
224 	bgmac->cco_ctl_maskset = platform_bgmac_cco_ctl_maskset;
225 	bgmac->get_bus_clock = platform_bgmac_get_bus_clock;
226 	bgmac->cmn_maskset32 = platform_bgmac_cmn_maskset32;
227 	if (of_parse_phandle(np, "phy-handle", 0)) {
228 		bgmac->phy_connect = platform_phy_connect;
229 	} else {
230 		bgmac->phy_connect = bgmac_phy_connect_direct;
231 		bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
232 	}
233 
234 	return bgmac_enet_probe(bgmac);
235 }
236 
237 static int bgmac_remove(struct platform_device *pdev)
238 {
239 	struct bgmac *bgmac = platform_get_drvdata(pdev);
240 
241 	bgmac_enet_remove(bgmac);
242 
243 	return 0;
244 }
245 
246 #ifdef CONFIG_PM
247 static int bgmac_suspend(struct device *dev)
248 {
249 	struct bgmac *bgmac = dev_get_drvdata(dev);
250 
251 	return bgmac_enet_suspend(bgmac);
252 }
253 
254 static int bgmac_resume(struct device *dev)
255 {
256 	struct bgmac *bgmac = dev_get_drvdata(dev);
257 
258 	return bgmac_enet_resume(bgmac);
259 }
260 
261 static const struct dev_pm_ops bgmac_pm_ops = {
262 	.suspend = bgmac_suspend,
263 	.resume = bgmac_resume
264 };
265 
266 #define BGMAC_PM_OPS (&bgmac_pm_ops)
267 #else
268 #define BGMAC_PM_OPS NULL
269 #endif /* CONFIG_PM */
270 
271 static const struct of_device_id bgmac_of_enet_match[] = {
272 	{.compatible = "brcm,amac",},
273 	{.compatible = "brcm,nsp-amac",},
274 	{.compatible = "brcm,ns2-amac",},
275 	{},
276 };
277 
278 MODULE_DEVICE_TABLE(of, bgmac_of_enet_match);
279 
280 static struct platform_driver bgmac_enet_driver = {
281 	.driver = {
282 		.name  = "bgmac-enet",
283 		.of_match_table = bgmac_of_enet_match,
284 		.pm = BGMAC_PM_OPS
285 	},
286 	.probe = bgmac_probe,
287 	.remove = bgmac_remove,
288 };
289 
290 module_platform_driver(bgmac_enet_driver);
291 MODULE_LICENSE("GPL");
292