1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * mtu3_dr.c - dual role switch and host glue layer
4 *
5 * Copyright (C) 2016 MediaTek Inc.
6 *
7 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
8 */
9
10 #include <dm/lists.h>
11 #include <linux/iopoll.h>
12
13 #include "mtu3.h"
14 #include "mtu3_dr.h"
15
host_ports_num_get(struct mtu3_host * u3h)16 static void host_ports_num_get(struct mtu3_host *u3h)
17 {
18 u32 xhci_cap;
19
20 xhci_cap = mtu3_readl(u3h->ippc_base, U3D_SSUSB_IP_XHCI_CAP);
21 u3h->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap);
22 u3h->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap);
23
24 dev_dbg(u3h->dev, "host - u2_ports:%d, u3_ports:%d\n",
25 u3h->u2_ports, u3h->u3_ports);
26 }
27
28 /* only configure ports will be used later */
ssusb_host_enable(struct mtu3_host * u3h)29 static int ssusb_host_enable(struct mtu3_host *u3h)
30 {
31 void __iomem *ibase = u3h->ippc_base;
32 int num_u3p = u3h->u3_ports;
33 int num_u2p = u3h->u2_ports;
34 int u3_ports_disabed;
35 u32 check_clk;
36 u32 value;
37 int i;
38
39 /* power on host ip */
40 mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);
41
42 /* power on and enable u3 ports except skipped ones */
43 u3_ports_disabed = 0;
44 for (i = 0; i < num_u3p; i++) {
45 if ((0x1 << i) & u3h->u3p_dis_msk) {
46 u3_ports_disabed++;
47 continue;
48 }
49
50 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
51 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS);
52 value |= SSUSB_U3_PORT_HOST_SEL;
53 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
54 }
55
56 /* power on and enable all u2 ports */
57 for (i = 0; i < num_u2p; i++) {
58 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
59 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
60 value |= SSUSB_U2_PORT_HOST_SEL;
61 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
62 }
63
64 check_clk = SSUSB_XHCI_RST_B_STS;
65 if (num_u3p > u3_ports_disabed)
66 check_clk = SSUSB_U3_MAC_RST_B_STS;
67
68 return ssusb_check_clocks(u3h->ssusb, check_clk);
69 }
70
ssusb_host_disable(struct mtu3_host * u3h)71 static void ssusb_host_disable(struct mtu3_host *u3h)
72 {
73 void __iomem *ibase = u3h->ippc_base;
74 int num_u3p = u3h->u3_ports;
75 int num_u2p = u3h->u2_ports;
76 u32 value;
77 int i;
78
79 /* power down and disable u3 ports except skipped ones */
80 for (i = 0; i < num_u3p; i++) {
81 if ((0x1 << i) & u3h->u3p_dis_msk)
82 continue;
83
84 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i));
85 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS;
86 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
87 }
88
89 /* power down and disable all u2 ports */
90 for (i = 0; i < num_u2p; i++) {
91 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
92 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS;
93 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value);
94 }
95
96 /* power down host ip */
97 mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN);
98 }
99
100 /*
101 * If host supports multiple ports, the VBUSes(5V) of ports except port0
102 * which supports OTG are better to be enabled by default in DTS.
103 * Because the host driver will keep link with devices attached when system
104 * enters suspend mode, so no need to control VBUSes after initialization.
105 */
ssusb_host_init(struct ssusb_mtk * ssusb)106 int ssusb_host_init(struct ssusb_mtk *ssusb)
107 {
108 struct mtu3_host *u3h = ssusb->u3h;
109 struct udevice *dev = u3h->dev;
110 int ret;
111
112 u3h->ssusb = ssusb;
113 u3h->hcd = ssusb->mac_base;
114 u3h->ippc_base = ssusb->ippc_base;
115
116 /* optional property, ignore the error */
117 dev_read_u32(dev, "mediatek,u3p-dis-msk", &u3h->u3p_dis_msk);
118
119 host_ports_num_get(u3h);
120 ret = ssusb_host_enable(u3h);
121 if (ret)
122 return ret;
123
124 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST);
125
126 ret = regulator_set_enable(ssusb->vbus_supply, true);
127 if (ret < 0 && ret != -ENOSYS) {
128 dev_err(dev, "failed to enable vbus %d!\n", ret);
129 return ret;
130 }
131
132 dev_info(dev, "%s done...\n", __func__);
133
134 return 0;
135 }
136
ssusb_host_exit(struct ssusb_mtk * ssusb)137 void ssusb_host_exit(struct ssusb_mtk *ssusb)
138 {
139 regulator_set_enable(ssusb->vbus_supply, false);
140 ssusb_host_disable(ssusb->u3h);
141 }
142