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usb: host: xhci-dwc3: Convert driver to DM
[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 <usb.h>
14
15 #include "xhci.h"
16 #include <asm/io.h>
17 #include <linux/usb/dwc3.h>
18
19 DECLARE_GLOBAL_DATA_PTR;
20
21 void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
22 {
23         clrsetbits_le32(&dwc3_reg->g_ctl,
24                         DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
25                         DWC3_GCTL_PRTCAPDIR(mode));
26 }
27
28 static void dwc3_phy_reset(struct dwc3 *dwc3_reg)
29 {
30         /* Assert USB3 PHY reset */
31         setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
32
33         /* Assert USB2 PHY reset */
34         setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
35
36         mdelay(100);
37
38         /* Clear USB3 PHY reset */
39         clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
40
41         /* Clear USB2 PHY reset */
42         clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
43 }
44
45 void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
46 {
47         /* Before Resetting PHY, put Core in Reset */
48         setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
49
50         /* reset USB3 phy - if required */
51         dwc3_phy_reset(dwc3_reg);
52
53         mdelay(100);
54
55         /* After PHYs are stable we can take Core out of reset state */
56         clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
57 }
58
59 int dwc3_core_init(struct dwc3 *dwc3_reg)
60 {
61         u32 reg;
62         u32 revision;
63         unsigned int dwc3_hwparams1;
64
65         revision = readl(&dwc3_reg->g_snpsid);
66         /* This should read as U3 followed by revision number */
67         if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
68                 puts("this is not a DesignWare USB3 DRD Core\n");
69                 return -1;
70         }
71
72         dwc3_core_soft_reset(dwc3_reg);
73
74         dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
75
76         reg = readl(&dwc3_reg->g_ctl);
77         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
78         reg &= ~DWC3_GCTL_DISSCRAMBLE;
79         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
80         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
81                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
82                 break;
83         default:
84                 debug("No power optimization available\n");
85         }
86
87         /*
88          * WORKAROUND: DWC3 revisions <1.90a have a bug
89          * where the device can fail to connect at SuperSpeed
90          * and falls back to high-speed mode which causes
91          * the device to enter a Connect/Disconnect loop
92          */
93         if ((revision & DWC3_REVISION_MASK) < 0x190a)
94                 reg |= DWC3_GCTL_U2RSTECN;
95
96         writel(reg, &dwc3_reg->g_ctl);
97
98         return 0;
99 }
100
101 void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
102 {
103         setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
104                         GFLADJ_30MHZ(val));
105 }
106
107 static int xhci_dwc3_probe(struct udevice *dev)
108 {
109         struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
110         struct xhci_hcor *hcor;
111         struct xhci_hccr *hccr;
112         struct dwc3 *dwc3_reg;
113
114         hccr = (struct xhci_hccr *)devfdt_get_addr(dev);
115         hcor = (struct xhci_hcor *)((phys_addr_t)hccr +
116                         HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
117
118         dwc3_reg = (struct dwc3 *)((char *)(hccr) + DWC3_REG_OFFSET);
119
120         dwc3_core_init(dwc3_reg);
121
122         return xhci_register(dev, hccr, hcor);
123 }
124
125 static int xhci_dwc3_remove(struct udevice *dev)
126 {
127         return xhci_deregister(dev);
128 }
129
130 static const struct udevice_id xhci_dwc3_ids[] = {
131         { .compatible = "snps,dwc3" },
132         { }
133 };
134
135 U_BOOT_DRIVER(xhci_dwc3) = {
136         .name = "xhci-dwc3",
137         .id = UCLASS_USB,
138         .of_match = xhci_dwc3_ids,
139         .probe = xhci_dwc3_probe,
140         .remove = xhci_dwc3_remove,
141         .ops = &xhci_usb_ops,
142         .priv_auto_alloc_size = sizeof(struct xhci_ctrl),
143         .platdata_auto_alloc_size = sizeof(struct xhci_dwc3_platdata),
144         .flags = DM_FLAG_ALLOC_PRIV_DMA,
145 };