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01658f0f KVA |
1 | /* |
2 | * omap-control-usb.c - The USB part of control module. | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * Author: Kishon Vijay Abraham I <kishon@ti.com> | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/of.h> | |
6cb9310a | 23 | #include <linux/of_device.h> |
01658f0f KVA |
24 | #include <linux/err.h> |
25 | #include <linux/io.h> | |
26 | #include <linux/clk.h> | |
27 | #include <linux/usb/omap_control_usb.h> | |
28 | ||
01658f0f | 29 | /** |
6cb9310a | 30 | * omap_control_usb_phy_power - power on/off the phy using control module reg |
01658f0f | 31 | * @dev: the control module device |
6cb9310a | 32 | * @on: 0 or 1, based on powering on or off the PHY |
01658f0f | 33 | */ |
6cb9310a | 34 | void omap_control_usb_phy_power(struct device *dev, int on) |
01658f0f KVA |
35 | { |
36 | u32 val; | |
37 | unsigned long rate; | |
6cb9310a | 38 | struct omap_control_usb *control_usb; |
01658f0f | 39 | |
6cb9310a RQ |
40 | if (IS_ERR(dev) || !dev) { |
41 | pr_err("%s: invalid device\n", __func__); | |
01658f0f | 42 | return; |
6cb9310a | 43 | } |
01658f0f | 44 | |
6cb9310a RQ |
45 | control_usb = dev_get_drvdata(dev); |
46 | if (!control_usb) { | |
47 | dev_err(dev, "%s: invalid control usb device\n", __func__); | |
48 | return; | |
01658f0f KVA |
49 | } |
50 | ||
6cb9310a RQ |
51 | if (control_usb->type == OMAP_CTRL_TYPE_OTGHS) |
52 | return; | |
01658f0f | 53 | |
6cb9310a RQ |
54 | val = readl(control_usb->power); |
55 | ||
56 | switch (control_usb->type) { | |
57 | case OMAP_CTRL_TYPE_USB2: | |
58 | if (on) | |
59 | val &= ~OMAP_CTRL_DEV_PHY_PD; | |
60 | else | |
61 | val |= OMAP_CTRL_DEV_PHY_PD; | |
62 | break; | |
01658f0f | 63 | |
6cb9310a RQ |
64 | case OMAP_CTRL_TYPE_PIPE3: |
65 | rate = clk_get_rate(control_usb->sys_clk); | |
66 | rate = rate/1000000; | |
67 | ||
68 | if (on) { | |
69 | val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK | | |
70 | OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK); | |
71 | val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON << | |
72 | OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT; | |
73 | val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT; | |
74 | } else { | |
75 | val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK; | |
76 | val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF << | |
77 | OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT; | |
78 | } | |
79 | break; | |
01658f0f | 80 | |
6cb9310a RQ |
81 | case OMAP_CTRL_TYPE_DRA7USB2: |
82 | if (on) | |
83 | val &= ~OMAP_CTRL_USB2_PHY_PD; | |
84 | else | |
85 | val |= OMAP_CTRL_USB2_PHY_PD; | |
86 | break; | |
87 | default: | |
88 | dev_err(dev, "%s: type %d not recognized\n", | |
89 | __func__, control_usb->type); | |
90 | break; | |
91 | } | |
01658f0f | 92 | |
6cb9310a | 93 | writel(val, control_usb->power); |
01658f0f KVA |
94 | } |
95 | EXPORT_SYMBOL_GPL(omap_control_usb_phy_power); | |
96 | ||
97 | /** | |
98 | * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded | |
99 | * @ctrl_usb: struct omap_control_usb * | |
100 | * | |
101 | * Writes to the mailbox register to notify the usb core that a usb | |
102 | * device has been connected. | |
103 | */ | |
104 | static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb) | |
105 | { | |
106 | u32 val; | |
107 | ||
108 | val = readl(ctrl_usb->otghs_control); | |
109 | val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND); | |
110 | val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID; | |
111 | writel(val, ctrl_usb->otghs_control); | |
112 | } | |
113 | ||
114 | /** | |
115 | * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high | |
116 | * impedance | |
117 | * @ctrl_usb: struct omap_control_usb * | |
118 | * | |
119 | * Writes to the mailbox register to notify the usb core that it has been | |
120 | * connected to a usb host. | |
121 | */ | |
122 | static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb) | |
123 | { | |
124 | u32 val; | |
125 | ||
126 | val = readl(ctrl_usb->otghs_control); | |
127 | val &= ~OMAP_CTRL_DEV_SESSEND; | |
128 | val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID | | |
129 | OMAP_CTRL_DEV_VBUSVALID; | |
130 | writel(val, ctrl_usb->otghs_control); | |
131 | } | |
132 | ||
133 | /** | |
134 | * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high | |
135 | * impedance | |
136 | * @ctrl_usb: struct omap_control_usb * | |
137 | * | |
138 | * Writes to the mailbox register to notify the usb core it's now in | |
139 | * disconnected state. | |
140 | */ | |
141 | static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb) | |
142 | { | |
143 | u32 val; | |
144 | ||
145 | val = readl(ctrl_usb->otghs_control); | |
146 | val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID); | |
147 | val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND; | |
148 | writel(val, ctrl_usb->otghs_control); | |
149 | } | |
150 | ||
151 | /** | |
152 | * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode | |
153 | * or device mode or to denote disconnected state | |
154 | * @dev: the control module device | |
155 | * @mode: The mode to which usb should be configured | |
156 | * | |
157 | * This is an API to write to the mailbox register to notify the usb core that | |
158 | * a usb device has been connected. | |
159 | */ | |
160 | void omap_control_usb_set_mode(struct device *dev, | |
161 | enum omap_control_usb_mode mode) | |
162 | { | |
163 | struct omap_control_usb *ctrl_usb; | |
164 | ||
0bb85dc2 | 165 | if (IS_ERR(dev) || !dev) |
01658f0f KVA |
166 | return; |
167 | ||
168 | ctrl_usb = dev_get_drvdata(dev); | |
169 | ||
0bb85dc2 RQ |
170 | if (!ctrl_usb) { |
171 | dev_err(dev, "Invalid control usb device\n"); | |
172 | return; | |
173 | } | |
174 | ||
175 | if (ctrl_usb->type != OMAP_CTRL_TYPE_OTGHS) | |
176 | return; | |
177 | ||
01658f0f KVA |
178 | switch (mode) { |
179 | case USB_MODE_HOST: | |
180 | omap_control_usb_host_mode(ctrl_usb); | |
181 | break; | |
182 | case USB_MODE_DEVICE: | |
183 | omap_control_usb_device_mode(ctrl_usb); | |
184 | break; | |
185 | case USB_MODE_DISCONNECT: | |
186 | omap_control_usb_set_sessionend(ctrl_usb); | |
187 | break; | |
188 | default: | |
189 | dev_vdbg(dev, "invalid omap control usb mode\n"); | |
190 | } | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(omap_control_usb_set_mode); | |
193 | ||
6cb9310a RQ |
194 | #ifdef CONFIG_OF |
195 | ||
196 | static const enum omap_control_usb_type otghs_data = OMAP_CTRL_TYPE_OTGHS; | |
197 | static const enum omap_control_usb_type usb2_data = OMAP_CTRL_TYPE_USB2; | |
198 | static const enum omap_control_usb_type pipe3_data = OMAP_CTRL_TYPE_PIPE3; | |
199 | static const enum omap_control_usb_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2; | |
200 | ||
201 | static const struct of_device_id omap_control_usb_id_table[] = { | |
202 | { | |
203 | .compatible = "ti,control-phy-otghs", | |
204 | .data = &otghs_data, | |
205 | }, | |
206 | { | |
207 | .compatible = "ti,control-phy-usb2", | |
208 | .data = &usb2_data, | |
209 | }, | |
210 | { | |
211 | .compatible = "ti,control-phy-pipe3", | |
212 | .data = &pipe3_data, | |
213 | }, | |
214 | { | |
215 | .compatible = "ti,control-phy-dra7usb2", | |
216 | .data = &dra7usb2_data, | |
217 | }, | |
218 | {}, | |
219 | }; | |
220 | MODULE_DEVICE_TABLE(of, omap_control_usb_id_table); | |
221 | #endif | |
222 | ||
223 | ||
01658f0f KVA |
224 | static int omap_control_usb_probe(struct platform_device *pdev) |
225 | { | |
226 | struct resource *res; | |
6cb9310a | 227 | const struct of_device_id *of_id; |
0bb85dc2 | 228 | struct omap_control_usb *control_usb; |
6cb9310a RQ |
229 | |
230 | of_id = of_match_device(of_match_ptr(omap_control_usb_id_table), | |
231 | &pdev->dev); | |
232 | if (!of_id) | |
233 | return -EINVAL; | |
01658f0f KVA |
234 | |
235 | control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb), | |
236 | GFP_KERNEL); | |
237 | if (!control_usb) { | |
238 | dev_err(&pdev->dev, "unable to alloc memory for control usb\n"); | |
239 | return -ENOMEM; | |
240 | } | |
241 | ||
6cb9310a RQ |
242 | control_usb->dev = &pdev->dev; |
243 | control_usb->type = *(enum omap_control_usb_type *)of_id->data; | |
01658f0f | 244 | |
6cb9310a | 245 | if (control_usb->type == OMAP_CTRL_TYPE_OTGHS) { |
01658f0f KVA |
246 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, |
247 | "otghs_control"); | |
57ae575b | 248 | control_usb->otghs_control = devm_ioremap_resource( |
01658f0f | 249 | &pdev->dev, res); |
57ae575b SK |
250 | if (IS_ERR(control_usb->otghs_control)) |
251 | return PTR_ERR(control_usb->otghs_control); | |
6cb9310a | 252 | } else { |
01658f0f | 253 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, |
6cb9310a RQ |
254 | "power"); |
255 | control_usb->power = devm_ioremap_resource(&pdev->dev, res); | |
256 | if (IS_ERR(control_usb->power)) { | |
257 | dev_err(&pdev->dev, "Couldn't get power register\n"); | |
258 | return PTR_ERR(control_usb->power); | |
259 | } | |
260 | } | |
01658f0f | 261 | |
6cb9310a | 262 | if (control_usb->type == OMAP_CTRL_TYPE_PIPE3) { |
01658f0f KVA |
263 | control_usb->sys_clk = devm_clk_get(control_usb->dev, |
264 | "sys_clkin"); | |
265 | if (IS_ERR(control_usb->sys_clk)) { | |
266 | pr_err("%s: unable to get sys_clkin\n", __func__); | |
267 | return -EINVAL; | |
268 | } | |
269 | } | |
270 | ||
01658f0f KVA |
271 | dev_set_drvdata(control_usb->dev, control_usb); |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
01658f0f KVA |
276 | static struct platform_driver omap_control_usb_driver = { |
277 | .probe = omap_control_usb_probe, | |
278 | .driver = { | |
279 | .name = "omap-control-usb", | |
280 | .owner = THIS_MODULE, | |
281 | .of_match_table = of_match_ptr(omap_control_usb_id_table), | |
282 | }, | |
283 | }; | |
284 | ||
285 | static int __init omap_control_usb_init(void) | |
286 | { | |
287 | return platform_driver_register(&omap_control_usb_driver); | |
288 | } | |
289 | subsys_initcall(omap_control_usb_init); | |
290 | ||
291 | static void __exit omap_control_usb_exit(void) | |
292 | { | |
293 | platform_driver_unregister(&omap_control_usb_driver); | |
294 | } | |
295 | module_exit(omap_control_usb_exit); | |
296 | ||
297 | MODULE_ALIAS("platform: omap_control_usb"); | |
298 | MODULE_AUTHOR("Texas Instruments Inc."); | |
299 | MODULE_DESCRIPTION("OMAP Control Module USB Driver"); | |
300 | MODULE_LICENSE("GPL v2"); |