1 /*
2 * This file configures the internal USB PHY in OMAP4430. Used
3 * with TWL6030 transceiver and MUSB on OMAP4430.
4 *
5 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * Author: Hema HK <hemahk@ti.com>
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 */
23
24 #include <linux/types.h>
25 #include <linux/delay.h>
26 #include <linux/clk.h>
27 #include <linux/io.h>
28 #include <linux/err.h>
29 #include <linux/usb.h>
30
31 #include <plat/usb.h>
32 #include "control.h"
33
34 /* OMAP control module register for UTMI PHY */
35 #define CONTROL_DEV_CONF 0x300
36 #define PHY_PD 0x1
37
38 #define USBOTGHS_CONTROL 0x33c
39 #define AVALID BIT(0)
40 #define BVALID BIT(1)
41 #define VBUSVALID BIT(2)
42 #define SESSEND BIT(3)
43 #define IDDIG BIT(4)
44
45 static struct clk *phyclk, *clk48m, *clk32k;
46 static void __iomem *ctrl_base;
47 static int usbotghs_control;
48
omap4430_phy_init(struct device * dev)49 int omap4430_phy_init(struct device *dev)
50 {
51 ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
52 if (!ctrl_base) {
53 pr_err("control module ioremap failed\n");
54 return -ENOMEM;
55 }
56 /* Power down the phy */
57 __raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
58
59 if (!dev) {
60 iounmap(ctrl_base);
61 return 0;
62 }
63
64 phyclk = clk_get(dev, "ocp2scp_usb_phy_ick");
65 if (IS_ERR(phyclk)) {
66 dev_err(dev, "cannot clk_get ocp2scp_usb_phy_ick\n");
67 iounmap(ctrl_base);
68 return PTR_ERR(phyclk);
69 }
70
71 clk48m = clk_get(dev, "ocp2scp_usb_phy_phy_48m");
72 if (IS_ERR(clk48m)) {
73 dev_err(dev, "cannot clk_get ocp2scp_usb_phy_phy_48m\n");
74 clk_put(phyclk);
75 iounmap(ctrl_base);
76 return PTR_ERR(clk48m);
77 }
78
79 clk32k = clk_get(dev, "usb_phy_cm_clk32k");
80 if (IS_ERR(clk32k)) {
81 dev_err(dev, "cannot clk_get usb_phy_cm_clk32k\n");
82 clk_put(phyclk);
83 clk_put(clk48m);
84 iounmap(ctrl_base);
85 return PTR_ERR(clk32k);
86 }
87 return 0;
88 }
89
omap4430_phy_set_clk(struct device * dev,int on)90 int omap4430_phy_set_clk(struct device *dev, int on)
91 {
92 static int state;
93
94 if (on && !state) {
95 /* Enable the phy clocks */
96 clk_enable(phyclk);
97 clk_enable(clk48m);
98 clk_enable(clk32k);
99 state = 1;
100 } else if (state) {
101 /* Disable the phy clocks */
102 clk_disable(phyclk);
103 clk_disable(clk48m);
104 clk_disable(clk32k);
105 state = 0;
106 }
107 return 0;
108 }
109
omap4430_phy_power(struct device * dev,int ID,int on)110 int omap4430_phy_power(struct device *dev, int ID, int on)
111 {
112 if (on) {
113 if (ID)
114 /* enable VBUS valid, IDDIG groung */
115 __raw_writel(AVALID | VBUSVALID, ctrl_base +
116 USBOTGHS_CONTROL);
117 else
118 /*
119 * Enable VBUS Valid, AValid and IDDIG
120 * high impedance
121 */
122 __raw_writel(IDDIG | AVALID | VBUSVALID,
123 ctrl_base + USBOTGHS_CONTROL);
124 } else {
125 /* Enable session END and IDIG to high impedance. */
126 __raw_writel(SESSEND | IDDIG, ctrl_base +
127 USBOTGHS_CONTROL);
128 }
129 return 0;
130 }
131
omap4430_phy_suspend(struct device * dev,int suspend)132 int omap4430_phy_suspend(struct device *dev, int suspend)
133 {
134 if (suspend) {
135 /* Disable the clocks */
136 omap4430_phy_set_clk(dev, 0);
137 /* Power down the phy */
138 __raw_writel(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
139
140 /* save the context */
141 usbotghs_control = __raw_readl(ctrl_base + USBOTGHS_CONTROL);
142 } else {
143 /* Enable the internel phy clcoks */
144 omap4430_phy_set_clk(dev, 1);
145 /* power on the phy */
146 if (__raw_readl(ctrl_base + CONTROL_DEV_CONF) & PHY_PD) {
147 __raw_writel(~PHY_PD, ctrl_base + CONTROL_DEV_CONF);
148 mdelay(200);
149 }
150
151 /* restore the context */
152 __raw_writel(usbotghs_control, ctrl_base + USBOTGHS_CONTROL);
153 }
154
155 return 0;
156 }
157
omap4430_phy_exit(struct device * dev)158 int omap4430_phy_exit(struct device *dev)
159 {
160 if (ctrl_base)
161 iounmap(ctrl_base);
162 if (phyclk)
163 clk_put(phyclk);
164 if (clk48m)
165 clk_put(clk48m);
166 if (clk32k)
167 clk_put(clk32k);
168
169 return 0;
170 }
171
am35x_musb_reset(void)172 void am35x_musb_reset(void)
173 {
174 u32 regval;
175
176 /* Reset the musb interface */
177 regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
178
179 regval |= AM35XX_USBOTGSS_SW_RST;
180 omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
181
182 regval &= ~AM35XX_USBOTGSS_SW_RST;
183 omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
184
185 regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
186 }
187
am35x_musb_phy_power(u8 on)188 void am35x_musb_phy_power(u8 on)
189 {
190 unsigned long timeout = jiffies + msecs_to_jiffies(100);
191 u32 devconf2;
192
193 if (on) {
194 /*
195 * Start the on-chip PHY and its PLL.
196 */
197 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
198
199 devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
200 devconf2 |= CONF2_PHY_PLLON;
201
202 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
203
204 pr_info(KERN_INFO "Waiting for PHY clock good...\n");
205 while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
206 & CONF2_PHYCLKGD)) {
207 cpu_relax();
208
209 if (time_after(jiffies, timeout)) {
210 pr_err(KERN_ERR "musb PHY clock good timed out\n");
211 break;
212 }
213 }
214 } else {
215 /*
216 * Power down the on-chip PHY.
217 */
218 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
219
220 devconf2 &= ~CONF2_PHY_PLLON;
221 devconf2 |= CONF2_PHYPWRDN | CONF2_OTGPWRDN;
222 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
223 }
224 }
225
am35x_musb_clear_irq(void)226 void am35x_musb_clear_irq(void)
227 {
228 u32 regval;
229
230 regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
231 regval |= AM35XX_USBOTGSS_INT_CLR;
232 omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
233 regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
234 }
235
am35x_set_mode(u8 musb_mode)236 void am35x_set_mode(u8 musb_mode)
237 {
238 u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
239
240 devconf2 &= ~CONF2_OTGMODE;
241 switch (musb_mode) {
242 #ifdef CONFIG_USB_MUSB_HDRC_HCD
243 case MUSB_HOST: /* Force VBUS valid, ID = 0 */
244 devconf2 |= CONF2_FORCE_HOST;
245 break;
246 #endif
247 #ifdef CONFIG_USB_GADGET_MUSB_HDRC
248 case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
249 devconf2 |= CONF2_FORCE_DEVICE;
250 break;
251 #endif
252 #ifdef CONFIG_USB_MUSB_OTG
253 case MUSB_OTG: /* Don't override the VBUS/ID comparators */
254 devconf2 |= CONF2_NO_OVERRIDE;
255 break;
256 #endif
257 default:
258 pr_info(KERN_INFO "Unsupported mode %u\n", musb_mode);
259 }
260
261 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
262 }
263
ti81xx_musb_phy_power(u8 on)264 void ti81xx_musb_phy_power(u8 on)
265 {
266 void __iomem *scm_base = NULL;
267 u32 usbphycfg;
268
269 scm_base = ioremap(TI81XX_SCM_BASE, SZ_2K);
270 if (!scm_base) {
271 pr_err("system control module ioremap failed\n");
272 return;
273 }
274
275 usbphycfg = __raw_readl(scm_base + USBCTRL0);
276
277 if (on) {
278 if (cpu_is_ti816x()) {
279 usbphycfg |= TI816X_USBPHY0_NORMAL_MODE;
280 usbphycfg &= ~TI816X_USBPHY_REFCLK_OSC;
281 } else if (cpu_is_ti814x()) {
282 usbphycfg &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN
283 | USBPHY_DPINPUT | USBPHY_DMINPUT);
284 usbphycfg |= (USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN
285 | USBPHY_DPOPBUFCTL | USBPHY_DMOPBUFCTL);
286 }
287 } else {
288 if (cpu_is_ti816x())
289 usbphycfg &= ~TI816X_USBPHY0_NORMAL_MODE;
290 else if (cpu_is_ti814x())
291 usbphycfg |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
292
293 }
294 __raw_writel(usbphycfg, scm_base + USBCTRL0);
295
296 iounmap(scm_base);
297 }
298