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
ci_hdrc_msm_por_reset(struct reset_controller_dev * r,unsigned long id)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
ci_hdrc_msm_notify_event(struct ci_hdrc * ci,unsigned event)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
ci_hdrc_msm_mux_phy(struct ci_hdrc_msm * ci,struct platform_device * pdev)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
ci_hdrc_msm_probe(struct platform_device * pdev)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
ci_hdrc_msm_remove(struct platform_device * pdev)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
