1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Freescale Semiconductor, Inc.
4  * Copyright 2017-2018 NXP
5  *	Dong Aisheng <aisheng.dong@nxp.com>
6  */
7 
8 #include <linux/err.h>
9 #include <linux/firmware/imx/sci.h>
10 #include <linux/module.h>
11 #include <linux/of_address.h>
12 #include <linux/pinctrl/pinctrl.h>
13 #include <linux/platform_device.h>
14 
15 #include "../core.h"
16 #include "pinctrl-imx.h"
17 
18 #define IMX_SC_PAD_FUNC_GET_WAKEUP	9
19 #define IMX_SC_PAD_FUNC_SET_WAKEUP	4
20 #define IMX_SC_IRQ_GROUP_WAKE           3   /* Wakeup interrupts */
21 #define IMX_SC_IRQ_PAD			2   /* Pad wakeup */
22 
23 enum pad_func_e {
24 	IMX_SC_PAD_FUNC_SET = 15,
25 	IMX_SC_PAD_FUNC_GET = 16,
26 };
27 
28 struct imx_sc_msg_req_pad_set {
29 	struct imx_sc_rpc_msg hdr;
30 	u32 val;
31 	u16 pad;
32 } __packed __aligned(4);
33 
34 struct imx_sc_msg_req_pad_get {
35 	struct imx_sc_rpc_msg hdr;
36 	u16 pad;
37 } __packed __aligned(4);
38 
39 struct imx_sc_msg_resp_pad_get {
40 	struct imx_sc_rpc_msg hdr;
41 	u32 val;
42 } __packed;
43 
44 struct imx_sc_msg_gpio_set_pad_wakeup {
45 	struct imx_sc_rpc_msg hdr;
46 	u16 pad;
47 	u8 wakeup;
48 } __packed __aligned(4);
49 
50 static struct imx_sc_ipc *pinctrl_ipc_handle;
51 
52 int imx_pinctrl_sc_ipc_init(struct platform_device *pdev)
53 {
54 	imx_scu_irq_group_enable(IMX_SC_IRQ_GROUP_WAKE,
55 					 IMX_SC_IRQ_PAD, true);
56 	return imx_scu_get_handle(&pinctrl_ipc_handle);
57 }
58 EXPORT_SYMBOL_GPL(imx_pinctrl_sc_ipc_init);
59 
60 int imx_pinconf_get_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
61 			unsigned long *config)
62 {
63 	struct imx_sc_msg_req_pad_get msg;
64 	struct imx_sc_msg_resp_pad_get *resp;
65 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
66 	int ret;
67 
68 	hdr->ver = IMX_SC_RPC_VERSION;
69 	hdr->svc = IMX_SC_RPC_SVC_PAD;
70 	hdr->func = IMX_SC_PAD_FUNC_GET;
71 	hdr->size = 2;
72 
73 	msg.pad = pin_id;
74 
75 	ret = imx_scu_call_rpc(pinctrl_ipc_handle, &msg, true);
76 	if (ret)
77 		return ret;
78 
79 	resp = (struct imx_sc_msg_resp_pad_get *)&msg;
80 	*config = resp->val;
81 
82 	return 0;
83 }
84 EXPORT_SYMBOL_GPL(imx_pinconf_get_scu);
85 
86 int imx_pinconf_set_scu(struct pinctrl_dev *pctldev, unsigned pin_id,
87 			unsigned long *configs, unsigned num_configs)
88 {
89 	struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
90 	struct imx_sc_msg_req_pad_set msg;
91 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
92 	unsigned int mux = configs[0];
93 	unsigned int conf;
94 	unsigned int val;
95 	int ret;
96 
97 	if (num_configs == 1) {
98 		struct imx_sc_msg_gpio_set_pad_wakeup wmsg;
99 
100 		hdr = &wmsg.hdr;
101 		hdr->ver = IMX_SC_RPC_VERSION;
102 		hdr->svc = IMX_SC_RPC_SVC_PAD;
103 		hdr->func = IMX_SC_PAD_FUNC_SET_WAKEUP;
104 		hdr->size = 2;
105 		wmsg.pad = pin_id;
106 		wmsg.wakeup = *configs;
107 		ret = imx_scu_call_rpc(pinctrl_ipc_handle, &wmsg, true);
108 
109 		dev_dbg(ipctl->dev, "wakeup pin_id: %d type: %ld\n",
110 				pin_id, *configs);
111 		return ret;
112 	}
113 
114 	/*
115 	 * Set mux and conf together in one IPC call
116 	 */
117 	WARN_ON(num_configs != 2);
118 	conf = configs[1];
119 
120 	val = conf | BM_PAD_CTL_IFMUX_ENABLE | BM_PAD_CTL_GP_ENABLE;
121 	val |= mux << BP_PAD_CTL_IFMUX;
122 
123 	hdr->ver = IMX_SC_RPC_VERSION;
124 	hdr->svc = IMX_SC_RPC_SVC_PAD;
125 	hdr->func = IMX_SC_PAD_FUNC_SET;
126 	hdr->size = 3;
127 
128 	msg.pad = pin_id;
129 	msg.val = val;
130 
131 	ret = imx_scu_call_rpc(pinctrl_ipc_handle, &msg, true);
132 
133 	dev_dbg(ipctl->dev, "write: pin_id %u config 0x%x val 0x%x\n",
134 		pin_id, conf, val);
135 
136 	return ret;
137 }
138 EXPORT_SYMBOL_GPL(imx_pinconf_set_scu);
139 
140 void imx_pinctrl_parse_pin_scu(struct imx_pinctrl *ipctl,
141 			       unsigned int *pin_id, struct imx_pin *pin,
142 			       const __be32 **list_p)
143 {
144 	const struct imx_pinctrl_soc_info *info = ipctl->info;
145 	struct imx_pin_scu *pin_scu = &pin->conf.scu;
146 	const __be32 *list = *list_p;
147 
148 	pin->pin = be32_to_cpu(*list++);
149 	*pin_id = pin->pin;
150 	pin_scu->mux_mode = be32_to_cpu(*list++);
151 	pin_scu->config = be32_to_cpu(*list++);
152 	*list_p = list;
153 
154 	dev_dbg(ipctl->dev, "%s: 0x%x 0x%08lx", info->pins[pin->pin].name,
155 		pin_scu->mux_mode, pin_scu->config);
156 }
157 EXPORT_SYMBOL_GPL(imx_pinctrl_parse_pin_scu);
158 
159 MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
160 MODULE_DESCRIPTION("NXP i.MX SCU common pinctrl driver");
161 MODULE_LICENSE("GPL v2");
162