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ARM: OMAP5: USB: Add OMAP5 common USB EHCI information
[u-boot] / drivers / usb / host / ehci-omap.c
1 /*
2  * (C) Copyright 2011 Ilya Yanok, Emcraft Systems
3  * (C) Copyright 2004-2008
4  * Texas Instruments, <www.ti.com>
5  *
6  * Derived from Beagle Board code by
7  *      Sunil Kumar <sunilsaini05@gmail.com>
8  *      Shashi Ranjan <shashiranjanmca05@gmail.com>
9  *
10  *
11  * SPDX-License-Identifier:     GPL-2.0+
12  */
13
14 #include <common.h>
15 #include <usb.h>
16 #include <usb/ulpi.h>
17 #include <errno.h>
18 #include <asm/io.h>
19 #include <asm/gpio.h>
20 #include <asm/arch/ehci.h>
21 #include <asm/ehci-omap.h>
22
23 #include "ehci.h"
24
25 static struct omap_uhh *const uhh = (struct omap_uhh *)OMAP_UHH_BASE;
26 static struct omap_usbtll *const usbtll = (struct omap_usbtll *)OMAP_USBTLL_BASE;
27 static struct omap_ehci *const ehci = (struct omap_ehci *)OMAP_EHCI_BASE;
28
29 static int omap_uhh_reset(void)
30 {
31 /*
32  * Soft resetting the UHH module causes instability issues on
33  * all OMAPs so we just avoid it.
34  *
35  * See OMAP36xx Errata
36  *  i571: USB host EHCI may stall when entering smart-standby mode
37  *  i660: USBHOST Configured In Smart-Idle Can Lead To a Deadlock
38  *
39  * On OMAP4/5, soft-resetting the UHH module will put it into
40  * Smart-Idle mode and lead to a deadlock.
41  *
42  * On OMAP3, this doesn't seem to be the case but still instabilities
43  * are observed on beagle (3530 ES1.0) if soft-reset is used.
44  * e.g. NFS root failures with Linux kernel.
45  */
46         return 0;
47 }
48
49 static int omap_ehci_tll_reset(void)
50 {
51         unsigned long init = get_timer(0);
52
53         /* perform TLL soft reset, and wait until reset is complete */
54         writel(OMAP_USBTLL_SYSCONFIG_SOFTRESET, &usbtll->sysc);
55
56         /* Wait for TLL reset to complete */
57         while (!(readl(&usbtll->syss) & OMAP_USBTLL_SYSSTATUS_RESETDONE))
58                 if (get_timer(init) > CONFIG_SYS_HZ) {
59                         debug("OMAP EHCI error: timeout resetting TLL\n");
60                         return -EL3RST;
61         }
62
63         return 0;
64 }
65
66 static void omap_usbhs_hsic_init(int port)
67 {
68         unsigned int reg;
69
70         /* Enable channels now */
71         reg = readl(&usbtll->channel_conf + port);
72
73         setbits_le32(&reg, (OMAP_TLL_CHANNEL_CONF_CHANMODE_TRANSPARENT_UTMI
74                 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
75                 | OMAP_TLL_CHANNEL_CONF_DRVVBUS
76                 | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
77                 | OMAP_TLL_CHANNEL_CONF_CHANEN));
78
79         writel(reg, &usbtll->channel_conf + port);
80 }
81
82 static void omap_ehci_soft_phy_reset(int port)
83 {
84         struct ulpi_viewport ulpi_vp;
85
86         ulpi_vp.viewport_addr = (u32)&ehci->insreg05_utmi_ulpi;
87         ulpi_vp.port_num = port;
88
89         ulpi_reset(&ulpi_vp);
90 }
91
92 inline int __board_usb_init(void)
93 {
94         return 0;
95 }
96 int board_usb_init(void) __attribute__((weak, alias("__board_usb_init")));
97
98 #if defined(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO) || \
99         defined(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO) || \
100         defined(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO)
101 /* controls PHY(s) reset signal(s) */
102 static inline void omap_ehci_phy_reset(int on, int delay)
103 {
104         /*
105          * Refer ISSUE1:
106          * Hold the PHY in RESET for enough time till
107          * PHY is settled and ready
108          */
109         if (delay && !on)
110                 udelay(delay);
111 #ifdef CONFIG_OMAP_EHCI_PHY1_RESET_GPIO
112         gpio_request(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, "USB PHY1 reset");
113         gpio_direction_output(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, !on);
114 #endif
115 #ifdef CONFIG_OMAP_EHCI_PHY2_RESET_GPIO
116         gpio_request(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO, "USB PHY2 reset");
117         gpio_direction_output(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO, !on);
118 #endif
119 #ifdef CONFIG_OMAP_EHCI_PHY3_RESET_GPIO
120         gpio_request(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO, "USB PHY3 reset");
121         gpio_direction_output(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO, !on);
122 #endif
123
124         /* Hold the PHY in RESET for enough time till DIR is high */
125         /* Refer: ISSUE1 */
126         if (delay && on)
127                 udelay(delay);
128 }
129 #else
130 #define omap_ehci_phy_reset(on, delay)  do {} while (0)
131 #endif
132
133 /* Reset is needed otherwise the kernel-driver will throw an error. */
134 int omap_ehci_hcd_stop(void)
135 {
136         debug("Resetting OMAP EHCI\n");
137         omap_ehci_phy_reset(1, 0);
138
139         if (omap_uhh_reset() < 0)
140                 return -1;
141
142         if (omap_ehci_tll_reset() < 0)
143                 return -1;
144
145         return 0;
146 }
147
148 /*
149  * Initialize the OMAP EHCI controller and PHY.
150  * Based on "drivers/usb/host/ehci-omap.c" from Linux 3.1
151  * See there for additional Copyrights.
152  */
153 int omap_ehci_hcd_init(struct omap_usbhs_board_data *usbhs_pdata,
154                 struct ehci_hccr **hccr, struct ehci_hcor **hcor)
155 {
156         int ret;
157         unsigned int i, reg = 0, rev = 0;
158
159         debug("Initializing OMAP EHCI\n");
160
161         ret = board_usb_init();
162         if (ret < 0)
163                 return ret;
164
165         /* Put the PHY in RESET */
166         omap_ehci_phy_reset(1, 10);
167
168         ret = omap_uhh_reset();
169         if (ret < 0)
170                 return ret;
171
172         ret = omap_ehci_tll_reset();
173         if (ret)
174                 return ret;
175
176         writel(OMAP_USBTLL_SYSCONFIG_ENAWAKEUP |
177                 OMAP_USBTLL_SYSCONFIG_SIDLEMODE |
178                 OMAP_USBTLL_SYSCONFIG_CACTIVITY, &usbtll->sysc);
179
180         /* Put UHH in NoIdle/NoStandby mode */
181         writel(OMAP_UHH_SYSCONFIG_VAL, &uhh->sysc);
182
183         /* setup ULPI bypass and burst configurations */
184         clrsetbits_le32(&reg, OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN,
185                 (OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN |
186                 OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN |
187                 OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN));
188
189         rev = readl(&uhh->rev);
190         if (rev == OMAP_USBHS_REV1) {
191                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[0]))
192                         clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS);
193                 else
194                         setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS);
195
196                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[1]))
197                         clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS);
198                 else
199                         setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS);
200
201                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[2]))
202                         clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS);
203                 else
204                         setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS);
205         } else if (rev == OMAP_USBHS_REV2) {
206
207                 clrsetbits_le32(&reg, (OMAP_P1_MODE_CLEAR | OMAP_P2_MODE_CLEAR),
208                                         OMAP4_UHH_HOSTCONFIG_APP_START_CLK);
209
210                 /* Clear port mode fields for PHY mode */
211
212                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[0]))
213                         setbits_le32(&reg, OMAP_P1_MODE_HSIC);
214
215                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[1]))
216                         setbits_le32(&reg, OMAP_P2_MODE_HSIC);
217
218         } else if (rev == OMAP_USBHS_REV2_1) {
219
220                 clrsetbits_le32(&reg,
221                                 (OMAP_P1_MODE_CLEAR |
222                                  OMAP_P2_MODE_CLEAR |
223                                  OMAP_P3_MODE_CLEAR),
224                                 OMAP4_UHH_HOSTCONFIG_APP_START_CLK);
225
226                 /* Clear port mode fields for PHY mode */
227
228                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[0]))
229                         setbits_le32(&reg, OMAP_P1_MODE_HSIC);
230
231                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[1]))
232                         setbits_le32(&reg, OMAP_P2_MODE_HSIC);
233
234                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[2]))
235                         setbits_le32(&reg, OMAP_P3_MODE_HSIC);
236         }
237
238         debug("OMAP UHH_REVISION 0x%x\n", rev);
239         writel(reg, &uhh->hostconfig);
240
241         for (i = 0; i < OMAP_HS_USB_PORTS; i++)
242                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[i]))
243                         omap_usbhs_hsic_init(i);
244
245         omap_ehci_phy_reset(0, 10);
246
247         /*
248          * An undocumented "feature" in the OMAP3 EHCI controller,
249          * causes suspended ports to be taken out of suspend when
250          * the USBCMD.Run/Stop bit is cleared (for example when
251          * we do ehci_bus_suspend).
252          * This breaks suspend-resume if the root-hub is allowed
253          * to suspend. Writing 1 to this undocumented register bit
254          * disables this feature and restores normal behavior.
255          */
256         writel(EHCI_INSNREG04_DISABLE_UNSUSPEND, &ehci->insreg04);
257
258         for (i = 0; i < OMAP_HS_USB_PORTS; i++)
259                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[i]))
260                         omap_ehci_soft_phy_reset(i);
261
262         *hccr = (struct ehci_hccr *)(OMAP_EHCI_BASE);
263         *hcor = (struct ehci_hcor *)(OMAP_EHCI_BASE + 0x10);
264
265         debug("OMAP EHCI init done\n");
266         return 0;
267 }