1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. */
3 
4 #include <linux/module.h>
5 #include <linux/platform_device.h>
6 #include <linux/pm_runtime.h>
7 #include <linux/usb/chipidea.h>
8 #include <linux/clk.h>
9 #include <linux/reset.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/regmap.h>
12 #include <linux/io.h>
13 #include <linux/reset-controller.h>
14 #include <linux/extcon.h>
15 #include <linux/of.h>
16 
17 #include "ci.h"
18 
19 #define HS_PHY_AHB_MODE			0x0098
20 
21 #define HS_PHY_GENCONFIG		0x009c
22 #define HS_PHY_TXFIFO_IDLE_FORCE_DIS	BIT(4)
23 
24 #define HS_PHY_GENCONFIG_2		0x00a0
25 #define HS_PHY_SESS_VLD_CTRL_EN		BIT(7)
26 #define HS_PHY_ULPI_TX_PKT_EN_CLR_FIX	BIT(19)
27 
28 #define HSPHY_SESS_VLD_CTRL		BIT(25)
29 
30 /* Vendor base starts at 0x200 beyond CI base */
31 #define HS_PHY_CTRL			0x0040
32 #define HS_PHY_SEC_CTRL			0x0078
33 #define HS_PHY_DIG_CLAMP_N		BIT(16)
34 #define HS_PHY_POR_ASSERT		BIT(0)
35 
36 struct ci_hdrc_msm {
37 	struct platform_device *ci;
38 	struct clk *core_clk;
39 	struct clk *iface_clk;
40 	struct clk *fs_clk;
41 	struct ci_hdrc_platform_data pdata;
42 	struct reset_controller_dev rcdev;
43 	bool secondary_phy;
44 	bool hsic;
45 	void __iomem *base;
46 };
47 
48 static int
49 ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id)
50 {
51 	struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev);
52 	void __iomem *addr = ci_msm->base;
53 	u32 val;
54 
55 	if (id)
56 		addr += HS_PHY_SEC_CTRL;
57 	else
58 		addr += HS_PHY_CTRL;
59 
60 	val = readl_relaxed(addr);
61 	val |= HS_PHY_POR_ASSERT;
62 	writel(val, addr);
63 	/*
64 	 * wait for minimum 10 microseconds as suggested by manual.
65 	 * Use a slightly larger value since the exact value didn't
66 	 * work 100% of the time.
67 	 */
68 	udelay(12);
69 	val &= ~HS_PHY_POR_ASSERT;
70 	writel(val, addr);
71 
72 	return 0;
73 }
74 
75 static const struct reset_control_ops ci_hdrc_msm_reset_ops = {
76 	.reset = ci_hdrc_msm_por_reset,
77 };
78 
79 static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
80 {
81 	struct device *dev = ci->dev->parent;
82 	struct ci_hdrc_msm *msm_ci = dev_get_drvdata(dev);
83 	int ret;
84 
85 	switch (event) {
86 	case CI_HDRC_CONTROLLER_RESET_EVENT:
87 		dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
88 
89 		hw_phymode_configure(ci);
90 		if (msm_ci->secondary_phy) {
91 			u32 val = readl_relaxed(msm_ci->base + HS_PHY_SEC_CTRL);
92 			val |= HS_PHY_DIG_CLAMP_N;
93 			writel_relaxed(val, msm_ci->base + HS_PHY_SEC_CTRL);
94 		}
95 
96 		ret = phy_init(ci->phy);
97 		if (ret)
98 			return ret;
99 
100 		ret = phy_power_on(ci->phy);
101 		if (ret) {
102 			phy_exit(ci->phy);
103 			return ret;
104 		}
105 
106 		/* use AHB transactor, allow posted data writes */
107 		hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);
108 
109 		/* workaround for rx buffer collision issue */
110 		hw_write_id_reg(ci, HS_PHY_GENCONFIG,
111 				HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0);
112 
113 		if (!msm_ci->hsic)
114 			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
115 					HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);
116 
117 		if (!IS_ERR(ci->platdata->vbus_extcon.edev) || ci->role_switch) {
118 			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
119 					HS_PHY_SESS_VLD_CTRL_EN,
120 					HS_PHY_SESS_VLD_CTRL_EN);
121 			hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
122 				 HSPHY_SESS_VLD_CTRL);
123 
124 		}
125 		break;
126 	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
127 		dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
128 		phy_power_off(ci->phy);
129 		phy_exit(ci->phy);
130 		break;
131 	default:
132 		dev_dbg(dev, "unknown ci_hdrc event\n");
133 		break;
134 	}
135 
136 	return 0;
137 }
138 
139 static int ci_hdrc_msm_mux_phy(struct ci_hdrc_msm *ci,
140 			       struct platform_device *pdev)
141 {
142 	struct regmap *regmap;
143 	struct device *dev = &pdev->dev;
144 	struct of_phandle_args args;
145 	u32 val;
146 	int ret;
147 
148 	ret = of_parse_phandle_with_fixed_args(dev->of_node, "phy-select", 2, 0,
149 					       &args);
150 	if (ret)
151 		return 0;
152 
153 	regmap = syscon_node_to_regmap(args.np);
154 	of_node_put(args.np);
155 	if (IS_ERR(regmap))
156 		return PTR_ERR(regmap);
157 
158 	ret = regmap_write(regmap, args.args[0], args.args[1]);
159 	if (ret)
160 		return ret;
161 
162 	ci->secondary_phy = !!args.args[1];
163 	if (ci->secondary_phy) {
164 		val = readl_relaxed(ci->base + HS_PHY_SEC_CTRL);
165 		val |= HS_PHY_DIG_CLAMP_N;
166 		writel_relaxed(val, ci->base + HS_PHY_SEC_CTRL);
167 	}
168 
169 	return 0;
170 }
171 
172 static int ci_hdrc_msm_probe(struct platform_device *pdev)
173 {
174 	struct ci_hdrc_msm *ci;
175 	struct platform_device *plat_ci;
176 	struct clk *clk;
177 	struct reset_control *reset;
178 	int ret;
179 	struct device_node *ulpi_node, *phy_node;
180 
181 	dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
182 
183 	ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
184 	if (!ci)
185 		return -ENOMEM;
186 	platform_set_drvdata(pdev, ci);
187 
188 	ci->pdata.name = "ci_hdrc_msm";
189 	ci->pdata.capoffset = DEF_CAPOFFSET;
190 	ci->pdata.flags	= CI_HDRC_REGS_SHARED | CI_HDRC_DISABLE_STREAMING |
191 			  CI_HDRC_OVERRIDE_AHB_BURST |
192 			  CI_HDRC_OVERRIDE_PHY_CONTROL;
193 	ci->pdata.notify_event = ci_hdrc_msm_notify_event;
194 
195 	reset = devm_reset_control_get(&pdev->dev, "core");
196 	if (IS_ERR(reset))
197 		return PTR_ERR(reset);
198 
199 	ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
200 	if (IS_ERR(clk))
201 		return PTR_ERR(clk);
202 
203 	ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
204 	if (IS_ERR(clk))
205 		return PTR_ERR(clk);
206 
207 	ci->fs_clk = clk = devm_clk_get_optional(&pdev->dev, "fs");
208 	if (IS_ERR(clk))
209 		return PTR_ERR(clk);
210 
211 	ci->base = devm_platform_ioremap_resource(pdev, 1);
212 	if (IS_ERR(ci->base))
213 		return PTR_ERR(ci->base);
214 
215 	ci->rcdev.owner = THIS_MODULE;
216 	ci->rcdev.ops = &ci_hdrc_msm_reset_ops;
217 	ci->rcdev.of_node = pdev->dev.of_node;
218 	ci->rcdev.nr_resets = 2;
219 	ret = devm_reset_controller_register(&pdev->dev, &ci->rcdev);
220 	if (ret)
221 		return ret;
222 
223 	ret = clk_prepare_enable(ci->fs_clk);
224 	if (ret)
225 		return ret;
226 
227 	reset_control_assert(reset);
228 	usleep_range(10000, 12000);
229 	reset_control_deassert(reset);
230 
231 	clk_disable_unprepare(ci->fs_clk);
232 
233 	ret = clk_prepare_enable(ci->core_clk);
234 	if (ret)
235 		return ret;
236 
237 	ret = clk_prepare_enable(ci->iface_clk);
238 	if (ret)
239 		goto err_iface;
240 
241 	ret = ci_hdrc_msm_mux_phy(ci, pdev);
242 	if (ret)
243 		goto err_mux;
244 
245 	ulpi_node = of_get_child_by_name(pdev->dev.of_node, "ulpi");
246 	if (ulpi_node) {
247 		phy_node = of_get_next_available_child(ulpi_node, NULL);
248 		ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
249 		of_node_put(phy_node);
250 	}
251 	of_node_put(ulpi_node);
252 
253 	plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
254 				     pdev->num_resources, &ci->pdata);
255 	if (IS_ERR(plat_ci)) {
256 		ret = PTR_ERR(plat_ci);
257 		if (ret != -EPROBE_DEFER)
258 			dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
259 		goto err_mux;
260 	}
261 
262 	ci->ci = plat_ci;
263 
264 	pm_runtime_set_active(&pdev->dev);
265 	pm_runtime_no_callbacks(&pdev->dev);
266 	pm_runtime_enable(&pdev->dev);
267 
268 	return 0;
269 
270 err_mux:
271 	clk_disable_unprepare(ci->iface_clk);
272 err_iface:
273 	clk_disable_unprepare(ci->core_clk);
274 	return ret;
275 }
276 
277 static void ci_hdrc_msm_remove(struct platform_device *pdev)
278 {
279 	struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);
280 
281 	pm_runtime_disable(&pdev->dev);
282 	ci_hdrc_remove_device(ci->ci);
283 	clk_disable_unprepare(ci->iface_clk);
284 	clk_disable_unprepare(ci->core_clk);
285 }
286 
287 static const struct of_device_id msm_ci_dt_match[] = {
288 	{ .compatible = "qcom,ci-hdrc", },
289 	{ }
290 };
291 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
292 
293 static struct platform_driver ci_hdrc_msm_driver = {
294 	.probe = ci_hdrc_msm_probe,
295 	.remove_new = ci_hdrc_msm_remove,
296 	.driver = {
297 		.name = "msm_hsusb",
298 		.of_match_table = msm_ci_dt_match,
299 	},
300 };
301 
302 module_platform_driver(ci_hdrc_msm_driver);
303 
304 MODULE_ALIAS("platform:msm_hsusb");
305 MODULE_ALIAS("platform:ci13xxx_msm");
306 MODULE_LICENSE("GPL v2");
307