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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/usb/mtu3/mtu3_host.c
1 // SPDX-License-Identifier: GPL-2.0
3 * mtu3_dr.c - dual role switch and host glue layer
5 * Copyright (C) 2016 MediaTek Inc.
7 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
10 #include <linux/clk.h>
11 #include <linux/iopoll.h>
12 #include <linux/irq.h>
13 #include <linux/kernel.h>
14 #include <linux/mfd/syscon.h>
15 #include <linux/of_device.h>
16 #include <linux/regmap.h>
21 #define PERI_WK_CTRL1 0x404
22 #define UWK_CTL1_IS_C(x) (((x) & 0xf) << 26)
23 #define UWK_CTL1_IS_E BIT(25)
24 #define UWK_CTL1_IDDIG_C(x) (((x) & 0xf) << 11) /* cycle debounce */
25 #define UWK_CTL1_IDDIG_E BIT(10) /* enable debounce */
26 #define UWK_CTL1_IDDIG_P BIT(9) /* polarity */
27 #define UWK_CTL1_IS_P BIT(6) /* polarity for ip sleep */
30 * ip-sleep wakeup mode:
31 * all clocks can be turn off, but power domain should be kept on
33 static void ssusb_wakeup_ip_sleep_en(struct ssusb_mtk
*ssusb
)
36 struct regmap
*pericfg
= ssusb
->pericfg
;
38 regmap_read(pericfg
, PERI_WK_CTRL1
, &tmp
);
39 tmp
&= ~UWK_CTL1_IS_P
;
40 tmp
&= ~(UWK_CTL1_IS_C(0xf));
41 tmp
|= UWK_CTL1_IS_C(0x8);
42 regmap_write(pericfg
, PERI_WK_CTRL1
, tmp
);
43 regmap_write(pericfg
, PERI_WK_CTRL1
, tmp
| UWK_CTL1_IS_E
);
45 regmap_read(pericfg
, PERI_WK_CTRL1
, &tmp
);
46 dev_dbg(ssusb
->dev
, "%s(): WK_CTRL1[P6,E25,C26:29]=%#x\n",
50 static void ssusb_wakeup_ip_sleep_dis(struct ssusb_mtk
*ssusb
)
54 regmap_read(ssusb
->pericfg
, PERI_WK_CTRL1
, &tmp
);
55 tmp
&= ~UWK_CTL1_IS_E
;
56 regmap_write(ssusb
->pericfg
, PERI_WK_CTRL1
, tmp
);
59 int ssusb_wakeup_of_property_parse(struct ssusb_mtk
*ssusb
,
60 struct device_node
*dn
)
62 struct device
*dev
= ssusb
->dev
;
65 * Wakeup function is optional, so it is not an error if this property
66 * does not exist, and in such case, no need to get relative
69 ssusb
->wakeup_en
= of_property_read_bool(dn
, "mediatek,enable-wakeup");
70 if (!ssusb
->wakeup_en
)
73 ssusb
->pericfg
= syscon_regmap_lookup_by_phandle(dn
,
74 "mediatek,syscon-wakeup");
75 if (IS_ERR(ssusb
->pericfg
)) {
76 dev_err(dev
, "fail to get pericfg regs\n");
77 return PTR_ERR(ssusb
->pericfg
);
83 static void host_ports_num_get(struct ssusb_mtk
*ssusb
)
87 xhci_cap
= mtu3_readl(ssusb
->ippc_base
, U3D_SSUSB_IP_XHCI_CAP
);
88 ssusb
->u2_ports
= SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap
);
89 ssusb
->u3_ports
= SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap
);
91 dev_dbg(ssusb
->dev
, "host - u2_ports:%d, u3_ports:%d\n",
92 ssusb
->u2_ports
, ssusb
->u3_ports
);
95 /* only configure ports will be used later */
96 int ssusb_host_enable(struct ssusb_mtk
*ssusb
)
98 void __iomem
*ibase
= ssusb
->ippc_base
;
99 int num_u3p
= ssusb
->u3_ports
;
100 int num_u2p
= ssusb
->u2_ports
;
101 int u3_ports_disabed
;
106 /* power on host ip */
107 mtu3_clrbits(ibase
, U3D_SSUSB_IP_PW_CTRL1
, SSUSB_IP_HOST_PDN
);
109 /* power on and enable u3 ports except skipped ones */
110 u3_ports_disabed
= 0;
111 for (i
= 0; i
< num_u3p
; i
++) {
112 if ((0x1 << i
) & ssusb
->u3p_dis_msk
) {
117 value
= mtu3_readl(ibase
, SSUSB_U3_CTRL(i
));
118 value
&= ~(SSUSB_U3_PORT_PDN
| SSUSB_U3_PORT_DIS
);
119 value
|= SSUSB_U3_PORT_HOST_SEL
;
120 mtu3_writel(ibase
, SSUSB_U3_CTRL(i
), value
);
123 /* power on and enable all u2 ports */
124 for (i
= 0; i
< num_u2p
; i
++) {
125 value
= mtu3_readl(ibase
, SSUSB_U2_CTRL(i
));
126 value
&= ~(SSUSB_U2_PORT_PDN
| SSUSB_U2_PORT_DIS
);
127 value
|= SSUSB_U2_PORT_HOST_SEL
;
128 mtu3_writel(ibase
, SSUSB_U2_CTRL(i
), value
);
131 check_clk
= SSUSB_XHCI_RST_B_STS
;
132 if (num_u3p
> u3_ports_disabed
)
133 check_clk
= SSUSB_U3_MAC_RST_B_STS
;
135 return ssusb_check_clocks(ssusb
, check_clk
);
138 int ssusb_host_disable(struct ssusb_mtk
*ssusb
, bool suspend
)
140 void __iomem
*ibase
= ssusb
->ippc_base
;
141 int num_u3p
= ssusb
->u3_ports
;
142 int num_u2p
= ssusb
->u2_ports
;
147 /* power down and disable u3 ports except skipped ones */
148 for (i
= 0; i
< num_u3p
; i
++) {
149 if ((0x1 << i
) & ssusb
->u3p_dis_msk
)
152 value
= mtu3_readl(ibase
, SSUSB_U3_CTRL(i
));
153 value
|= SSUSB_U3_PORT_PDN
;
154 value
|= suspend
? 0 : SSUSB_U3_PORT_DIS
;
155 mtu3_writel(ibase
, SSUSB_U3_CTRL(i
), value
);
158 /* power down and disable all u2 ports */
159 for (i
= 0; i
< num_u2p
; i
++) {
160 value
= mtu3_readl(ibase
, SSUSB_U2_CTRL(i
));
161 value
|= SSUSB_U2_PORT_PDN
;
162 value
|= suspend
? 0 : SSUSB_U2_PORT_DIS
;
163 mtu3_writel(ibase
, SSUSB_U2_CTRL(i
), value
);
166 /* power down host ip */
167 mtu3_setbits(ibase
, U3D_SSUSB_IP_PW_CTRL1
, SSUSB_IP_HOST_PDN
);
172 /* wait for host ip to sleep */
173 ret
= readl_poll_timeout(ibase
+ U3D_SSUSB_IP_PW_STS1
, value
,
174 (value
& SSUSB_IP_SLEEP_STS
), 100, 100000);
176 dev_err(ssusb
->dev
, "ip sleep failed!!!\n");
181 static void ssusb_host_setup(struct ssusb_mtk
*ssusb
)
183 struct otg_switch_mtk
*otg_sx
= &ssusb
->otg_switch
;
185 host_ports_num_get(ssusb
);
188 * power on host and power on/enable all ports
189 * if support OTG, gadget driver will switch port0 to device mode
191 ssusb_host_enable(ssusb
);
193 if (otg_sx
->manual_drd_enabled
)
194 ssusb_set_force_mode(ssusb
, MTU3_DR_FORCE_HOST
);
196 /* if port0 supports dual-role, works as host mode by default */
197 ssusb_set_vbus(&ssusb
->otg_switch
, 1);
200 static void ssusb_host_cleanup(struct ssusb_mtk
*ssusb
)
203 ssusb_set_vbus(&ssusb
->otg_switch
, 0);
205 ssusb_host_disable(ssusb
, false);
209 * If host supports multiple ports, the VBUSes(5V) of ports except port0
210 * which supports OTG are better to be enabled by default in DTS.
211 * Because the host driver will keep link with devices attached when system
212 * enters suspend mode, so no need to control VBUSes after initialization.
214 int ssusb_host_init(struct ssusb_mtk
*ssusb
, struct device_node
*parent_dn
)
216 struct device
*parent_dev
= ssusb
->dev
;
219 ssusb_host_setup(ssusb
);
221 ret
= of_platform_populate(parent_dn
, NULL
, NULL
, parent_dev
);
223 dev_dbg(parent_dev
, "failed to create child devices at %pOF\n",
228 dev_info(parent_dev
, "xHCI platform device register success...\n");
233 void ssusb_host_exit(struct ssusb_mtk
*ssusb
)
235 of_platform_depopulate(ssusb
->dev
);
236 ssusb_host_cleanup(ssusb
);
239 int ssusb_wakeup_enable(struct ssusb_mtk
*ssusb
)
241 if (ssusb
->wakeup_en
)
242 ssusb_wakeup_ip_sleep_en(ssusb
);
247 void ssusb_wakeup_disable(struct ssusb_mtk
*ssusb
)
249 if (ssusb
->wakeup_en
)
250 ssusb_wakeup_ip_sleep_dis(ssusb
);