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[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 #ifdef CONFIG_USB_ULPI
83 static void omap_ehci_soft_phy_reset(int port)
84 {
85         struct ulpi_viewport ulpi_vp;
86
87         ulpi_vp.viewport_addr = (u32)&ehci->insreg05_utmi_ulpi;
88         ulpi_vp.port_num = port;
89
90         ulpi_reset(&ulpi_vp);
91 }
92 #else
93 static void omap_ehci_soft_phy_reset(int port)
94 {
95         return;
96 }
97 #endif
98
99 #if defined(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO) || \
100         defined(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO) || \
101         defined(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO)
102 /* controls PHY(s) reset signal(s) */
103 static inline void omap_ehci_phy_reset(int on, int delay)
104 {
105         /*
106          * Refer ISSUE1:
107          * Hold the PHY in RESET for enough time till
108          * PHY is settled and ready
109          */
110         if (delay && !on)
111                 udelay(delay);
112 #ifdef CONFIG_OMAP_EHCI_PHY1_RESET_GPIO
113         gpio_request(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, "USB PHY1 reset");
114         gpio_direction_output(CONFIG_OMAP_EHCI_PHY1_RESET_GPIO, !on);
115 #endif
116 #ifdef CONFIG_OMAP_EHCI_PHY2_RESET_GPIO
117         gpio_request(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO, "USB PHY2 reset");
118         gpio_direction_output(CONFIG_OMAP_EHCI_PHY2_RESET_GPIO, !on);
119 #endif
120 #ifdef CONFIG_OMAP_EHCI_PHY3_RESET_GPIO
121         gpio_request(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO, "USB PHY3 reset");
122         gpio_direction_output(CONFIG_OMAP_EHCI_PHY3_RESET_GPIO, !on);
123 #endif
124
125         /* Hold the PHY in RESET for enough time till DIR is high */
126         /* Refer: ISSUE1 */
127         if (delay && on)
128                 udelay(delay);
129 }
130 #else
131 #define omap_ehci_phy_reset(on, delay)  do {} while (0)
132 #endif
133
134 /* Reset is needed otherwise the kernel-driver will throw an error. */
135 int omap_ehci_hcd_stop(void)
136 {
137         debug("Resetting OMAP EHCI\n");
138         omap_ehci_phy_reset(1, 0);
139
140         if (omap_uhh_reset() < 0)
141                 return -1;
142
143         if (omap_ehci_tll_reset() < 0)
144                 return -1;
145
146         return 0;
147 }
148
149 /*
150  * Initialize the OMAP EHCI controller and PHY.
151  * Based on "drivers/usb/host/ehci-omap.c" from Linux 3.1
152  * See there for additional Copyrights.
153  */
154 int omap_ehci_hcd_init(int index, struct omap_usbhs_board_data *usbhs_pdata,
155                        struct ehci_hccr **hccr, struct ehci_hcor **hcor)
156 {
157         int ret;
158         unsigned int i, reg = 0, rev = 0;
159
160         debug("Initializing OMAP EHCI\n");
161
162         ret = board_usb_init(index, USB_INIT_HOST);
163         if (ret < 0)
164                 return ret;
165
166         /* Put the PHY in RESET */
167         omap_ehci_phy_reset(1, 10);
168
169         ret = omap_uhh_reset();
170         if (ret < 0)
171                 return ret;
172
173         ret = omap_ehci_tll_reset();
174         if (ret)
175                 return ret;
176
177         writel(OMAP_USBTLL_SYSCONFIG_ENAWAKEUP |
178                 OMAP_USBTLL_SYSCONFIG_SIDLEMODE |
179                 OMAP_USBTLL_SYSCONFIG_CACTIVITY, &usbtll->sysc);
180
181         /* Put UHH in NoIdle/NoStandby mode */
182         writel(OMAP_UHH_SYSCONFIG_VAL, &uhh->sysc);
183
184         /* setup ULPI bypass and burst configurations */
185         clrsetbits_le32(&reg, OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN,
186                 (OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN |
187                 OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN |
188                 OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN));
189
190         rev = readl(&uhh->rev);
191         if (rev == OMAP_USBHS_REV1) {
192                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[0]))
193                         clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS);
194                 else
195                         setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS);
196
197                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[1]))
198                         clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS);
199                 else
200                         setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS);
201
202                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[2]))
203                         clrbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS);
204                 else
205                         setbits_le32(&reg, OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS);
206         } else if (rev == OMAP_USBHS_REV2) {
207
208                 clrsetbits_le32(&reg, (OMAP_P1_MODE_CLEAR | OMAP_P2_MODE_CLEAR),
209                                         OMAP4_UHH_HOSTCONFIG_APP_START_CLK);
210
211                 /* Clear port mode fields for PHY mode */
212
213                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[0]))
214                         setbits_le32(&reg, OMAP_P1_MODE_HSIC);
215
216                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[1]))
217                         setbits_le32(&reg, OMAP_P2_MODE_HSIC);
218
219         } else if (rev == OMAP_USBHS_REV2_1) {
220
221                 clrsetbits_le32(&reg,
222                                 (OMAP_P1_MODE_CLEAR |
223                                  OMAP_P2_MODE_CLEAR |
224                                  OMAP_P3_MODE_CLEAR),
225                                 OMAP4_UHH_HOSTCONFIG_APP_START_CLK);
226
227                 /* Clear port mode fields for PHY mode */
228
229                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[0]))
230                         setbits_le32(&reg, OMAP_P1_MODE_HSIC);
231
232                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[1]))
233                         setbits_le32(&reg, OMAP_P2_MODE_HSIC);
234
235                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[2]))
236                         setbits_le32(&reg, OMAP_P3_MODE_HSIC);
237         }
238
239         debug("OMAP UHH_REVISION 0x%x\n", rev);
240         writel(reg, &uhh->hostconfig);
241
242         for (i = 0; i < OMAP_HS_USB_PORTS; i++)
243                 if (is_ehci_hsic_mode(usbhs_pdata->port_mode[i]))
244                         omap_usbhs_hsic_init(i);
245
246         omap_ehci_phy_reset(0, 10);
247
248         /*
249          * An undocumented "feature" in the OMAP3 EHCI controller,
250          * causes suspended ports to be taken out of suspend when
251          * the USBCMD.Run/Stop bit is cleared (for example when
252          * we do ehci_bus_suspend).
253          * This breaks suspend-resume if the root-hub is allowed
254          * to suspend. Writing 1 to this undocumented register bit
255          * disables this feature and restores normal behavior.
256          */
257         writel(EHCI_INSNREG04_DISABLE_UNSUSPEND, &ehci->insreg04);
258
259         for (i = 0; i < OMAP_HS_USB_PORTS; i++)
260                 if (is_ehci_phy_mode(usbhs_pdata->port_mode[i]))
261                         omap_ehci_soft_phy_reset(i);
262
263         *hccr = (struct ehci_hccr *)(OMAP_EHCI_BASE);
264         *hcor = (struct ehci_hcor *)(OMAP_EHCI_BASE + 0x10);
265
266         debug("OMAP EHCI init done\n");
267         return 0;
268 }