1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Qualcomm EHCI driver
4 *
5 * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
6 *
7 * Based on Linux driver
8 */
9
10 #include <common.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <fdtdec.h>
14 #include <linux/libfdt.h>
15 #include <usb.h>
16 #include <usb/ehci-ci.h>
17 #include <usb/ulpi.h>
18 #include <wait_bit.h>
19 #include <asm/gpio.h>
20 #include <asm/io.h>
21 #include <linux/compat.h>
22 #include "ehci.h"
23
24 struct msm_ehci_priv {
25 struct ehci_ctrl ctrl; /* Needed by EHCI */
26 struct usb_ehci *ehci; /* Start of IP core*/
27 struct ulpi_viewport ulpi_vp; /* ULPI Viewport */
28 struct phy phy;
29 };
30
msm_init_after_reset(struct ehci_ctrl * dev)31 static int msm_init_after_reset(struct ehci_ctrl *dev)
32 {
33 struct msm_ehci_priv *p = container_of(dev, struct msm_ehci_priv, ctrl);
34 struct usb_ehci *ehci = p->ehci;
35
36 generic_phy_reset(&p->phy);
37
38 /* set mode to host controller */
39 writel(CM_HOST, &ehci->usbmode);
40
41 return 0;
42 }
43
44 static const struct ehci_ops msm_ehci_ops = {
45 .init_after_reset = msm_init_after_reset
46 };
47
ehci_usb_probe(struct udevice * dev)48 static int ehci_usb_probe(struct udevice *dev)
49 {
50 struct msm_ehci_priv *p = dev_get_priv(dev);
51 struct usb_ehci *ehci = p->ehci;
52 struct usb_platdata *plat = dev_get_platdata(dev);
53 struct ehci_hccr *hccr;
54 struct ehci_hcor *hcor;
55 int ret;
56
57 hccr = (struct ehci_hccr *)((phys_addr_t)&ehci->caplength);
58 hcor = (struct ehci_hcor *)((phys_addr_t)hccr +
59 HC_LENGTH(ehci_readl(&(hccr)->cr_capbase)));
60
61 ret = ehci_setup_phy(dev, &p->phy, 0);
62 if (ret)
63 return ret;
64
65 ret = board_usb_init(0, plat->init_type);
66 if (ret < 0)
67 return ret;
68
69 return ehci_register(dev, hccr, hcor, &msm_ehci_ops, 0,
70 plat->init_type);
71 }
72
ehci_usb_remove(struct udevice * dev)73 static int ehci_usb_remove(struct udevice *dev)
74 {
75 struct msm_ehci_priv *p = dev_get_priv(dev);
76 struct usb_ehci *ehci = p->ehci;
77 int ret;
78
79 ret = ehci_deregister(dev);
80 if (ret)
81 return ret;
82
83 /* Stop controller. */
84 clrbits_le32(&ehci->usbcmd, CMD_RUN);
85
86 ret = ehci_shutdown_phy(dev, &p->phy);
87 if (ret)
88 return ret;
89
90 ret = board_usb_init(0, USB_INIT_DEVICE); /* Board specific hook */
91 if (ret < 0)
92 return ret;
93
94 /* Reset controller */
95 setbits_le32(&ehci->usbcmd, CMD_RESET);
96
97 /* Wait for reset */
98 if (wait_for_bit_le32(&ehci->usbcmd, CMD_RESET, false, 30, false)) {
99 printf("Stuck on USB reset.\n");
100 return -ETIMEDOUT;
101 }
102
103 return 0;
104 }
105
ehci_usb_ofdata_to_platdata(struct udevice * dev)106 static int ehci_usb_ofdata_to_platdata(struct udevice *dev)
107 {
108 struct msm_ehci_priv *priv = dev_get_priv(dev);
109
110 priv->ulpi_vp.port_num = 0;
111 priv->ehci = (void *)devfdt_get_addr(dev);
112
113 if (priv->ehci == (void *)FDT_ADDR_T_NONE)
114 return -EINVAL;
115
116 /* Warning: this will not work if viewport address is > 64 bit due to
117 * ULPI design.
118 */
119 priv->ulpi_vp.viewport_addr = (phys_addr_t)&priv->ehci->ulpi_viewpoint;
120
121 return 0;
122 }
123
124 #if defined(CONFIG_CI_UDC)
125 /* Little quirk that MSM needs with Chipidea controller
126 * Must reinit phy after reset
127 */
ci_init_after_reset(struct ehci_ctrl * ctrl)128 void ci_init_after_reset(struct ehci_ctrl *ctrl)
129 {
130 struct msm_ehci_priv *p = ctrl->priv;
131
132 generic_phy_reset(&p->phy);
133 }
134 #endif
135
136 static const struct udevice_id ehci_usb_ids[] = {
137 { .compatible = "qcom,ehci-host", },
138 { }
139 };
140
141 U_BOOT_DRIVER(usb_ehci) = {
142 .name = "ehci_msm",
143 .id = UCLASS_USB,
144 .of_match = ehci_usb_ids,
145 .ofdata_to_platdata = ehci_usb_ofdata_to_platdata,
146 .probe = ehci_usb_probe,
147 .remove = ehci_usb_remove,
148 .ops = &ehci_usb_ops,
149 .priv_auto_alloc_size = sizeof(struct msm_ehci_priv),
150 .platdata_auto_alloc_size = sizeof(struct usb_platdata),
151 .flags = DM_FLAG_ALLOC_PRIV_DMA,
152 };
153