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usb: host: xhci-dwc3: Add generic PHY support
[u-boot] / drivers / usb / host / xhci-dwc3.c
1 /*
2  * Copyright 2015 Freescale Semiconductor, Inc.
3  *
4  * DWC3 controller driver
5  *
6  * Author: Ramneek Mehresh<ramneek.mehresh@freescale.com>
7  *
8  * SPDX-License-Identifier:     GPL-2.0+
9  */
10
11 #include <common.h>
12 #include <dm.h>
13 #include <fdtdec.h>
14 #include <generic-phy.h>
15 #include <usb.h>
16
17 #include "xhci.h"
18 #include <asm/io.h>
19 #include <linux/usb/dwc3.h>
20 #include <linux/usb/otg.h>
21
22 DECLARE_GLOBAL_DATA_PTR;
23
24 struct xhci_dwc3_platdata {
25         struct phy usb_phy;
26 };
27
28 void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
29 {
30         clrsetbits_le32(&dwc3_reg->g_ctl,
31                         DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
32                         DWC3_GCTL_PRTCAPDIR(mode));
33 }
34
35 static void dwc3_phy_reset(struct dwc3 *dwc3_reg)
36 {
37         /* Assert USB3 PHY reset */
38         setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
39
40         /* Assert USB2 PHY reset */
41         setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
42
43         mdelay(100);
44
45         /* Clear USB3 PHY reset */
46         clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
47
48         /* Clear USB2 PHY reset */
49         clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
50 }
51
52 void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
53 {
54         /* Before Resetting PHY, put Core in Reset */
55         setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
56
57         /* reset USB3 phy - if required */
58         dwc3_phy_reset(dwc3_reg);
59
60         mdelay(100);
61
62         /* After PHYs are stable we can take Core out of reset state */
63         clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
64 }
65
66 int dwc3_core_init(struct dwc3 *dwc3_reg)
67 {
68         u32 reg;
69         u32 revision;
70         unsigned int dwc3_hwparams1;
71
72         revision = readl(&dwc3_reg->g_snpsid);
73         /* This should read as U3 followed by revision number */
74         if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
75                 puts("this is not a DesignWare USB3 DRD Core\n");
76                 return -1;
77         }
78
79         dwc3_core_soft_reset(dwc3_reg);
80
81         dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
82
83         reg = readl(&dwc3_reg->g_ctl);
84         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
85         reg &= ~DWC3_GCTL_DISSCRAMBLE;
86         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
87         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
88                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
89                 break;
90         default:
91                 debug("No power optimization available\n");
92         }
93
94         /*
95          * WORKAROUND: DWC3 revisions <1.90a have a bug
96          * where the device can fail to connect at SuperSpeed
97          * and falls back to high-speed mode which causes
98          * the device to enter a Connect/Disconnect loop
99          */
100         if ((revision & DWC3_REVISION_MASK) < 0x190a)
101                 reg |= DWC3_GCTL_U2RSTECN;
102
103         writel(reg, &dwc3_reg->g_ctl);
104
105         return 0;
106 }
107
108 void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
109 {
110         setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
111                         GFLADJ_30MHZ(val));
112 }
113
114 static int xhci_dwc3_probe(struct udevice *dev)
115 {
116         struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
117         struct xhci_hcor *hcor;
118         struct xhci_hccr *hccr;
119         struct dwc3 *dwc3_reg;
120         enum usb_dr_mode dr_mode;
121         int ret;
122
123         hccr = (struct xhci_hccr *)devfdt_get_addr(dev);
124         hcor = (struct xhci_hcor *)((phys_addr_t)hccr +
125                         HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
126
127         ret = generic_phy_get_by_index(dev, 0, &plat->usb_phy);
128         if (ret) {
129                 if (ret != -ENOENT) {
130                         error("Failed to get USB PHY for %s\n", dev->name);
131                         return ret;
132                 }
133         } else {
134                 ret = generic_phy_init(&plat->usb_phy);
135                 if (ret) {
136                         error("Can't init USB PHY for %s\n", dev->name);
137                         return ret;
138                 }
139         }
140
141         dwc3_reg = (struct dwc3 *)((char *)(hccr) + DWC3_REG_OFFSET);
142
143         dwc3_core_init(dwc3_reg);
144
145         dr_mode = usb_get_dr_mode(dev_of_offset(dev));
146         if (dr_mode == USB_DR_MODE_UNKNOWN)
147                 /* by default set dual role mode to HOST */
148                 dr_mode = USB_DR_MODE_HOST;
149
150         dwc3_set_mode(dwc3_reg, dr_mode);
151
152         return xhci_register(dev, hccr, hcor);
153 }
154
155 static int xhci_dwc3_remove(struct udevice *dev)
156 {
157         struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
158         int ret;
159
160         if (generic_phy_valid(&plat->usb_phy)) {
161                 ret = generic_phy_exit(&plat->usb_phy);
162                 if (ret) {
163                         error("Can't deinit USB PHY for %s\n", dev->name);
164                         return ret;
165                 }
166         }
167
168         return xhci_deregister(dev);
169 }
170
171 static const struct udevice_id xhci_dwc3_ids[] = {
172         { .compatible = "snps,dwc3" },
173         { }
174 };
175
176 U_BOOT_DRIVER(xhci_dwc3) = {
177         .name = "xhci-dwc3",
178         .id = UCLASS_USB,
179         .of_match = xhci_dwc3_ids,
180         .probe = xhci_dwc3_probe,
181         .remove = xhci_dwc3_remove,
182         .ops = &xhci_usb_ops,
183         .priv_auto_alloc_size = sizeof(struct xhci_ctrl),
184         .platdata_auto_alloc_size = sizeof(struct xhci_dwc3_platdata),
185         .flags = DM_FLAG_ALLOC_PRIV_DMA,
186 };