tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright 2019 NXP
4 *
5 * Implementation of the SCU IRQ functions using MU.
6 *
7 */
8
9#include <dt-bindings/firmware/imx/rsrc.h>
10#include <linux/firmware/imx/ipc.h>
11#include <linux/mailbox_client.h>
12
13#define IMX_SC_IRQ_FUNC_ENABLE 1
14#define IMX_SC_IRQ_FUNC_STATUS 2
15#define IMX_SC_IRQ_NUM_GROUP 4
16
17static u32 mu_resource_id;
18
19struct imx_sc_msg_irq_get_status {
20 struct imx_sc_rpc_msg hdr;
21 union {
22 struct {
23 u16 resource;
24 u8 group;
25 u8 reserved;
26 } __packed req;
27 struct {
28 u32 status;
29 } resp;
30 } data;
31};
32
33struct imx_sc_msg_irq_enable {
34 struct imx_sc_rpc_msg hdr;
35 u32 mask;
36 u16 resource;
37 u8 group;
38 u8 enable;
39} __packed;
40
41static struct imx_sc_ipc *imx_sc_irq_ipc_handle;
42static struct work_struct imx_sc_irq_work;
43static ATOMIC_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
44
45int imx_scu_irq_register_notifier(struct notifier_block *nb)
46{
47 return atomic_notifier_chain_register(
48 &imx_scu_irq_notifier_chain, nb);
49}
50EXPORT_SYMBOL(imx_scu_irq_register_notifier);
51
52int imx_scu_irq_unregister_notifier(struct notifier_block *nb)
53{
54 return atomic_notifier_chain_unregister(
55 &imx_scu_irq_notifier_chain, nb);
56}
57EXPORT_SYMBOL(imx_scu_irq_unregister_notifier);
58
59static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
60{
61 return atomic_notifier_call_chain(&imx_scu_irq_notifier_chain,
62 status, (void *)group);
63}
64
65static void imx_scu_irq_work_handler(struct work_struct *work)
66{
67 struct imx_sc_msg_irq_get_status msg;
68 struct imx_sc_rpc_msg *hdr = &msg.hdr;
69 u32 irq_status;
70 int ret;
71 u8 i;
72
73 for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
74 hdr->ver = IMX_SC_RPC_VERSION;
75 hdr->svc = IMX_SC_RPC_SVC_IRQ;
76 hdr->func = IMX_SC_IRQ_FUNC_STATUS;
77 hdr->size = 2;
78
79 msg.data.req.resource = mu_resource_id;
80 msg.data.req.group = i;
81
82 ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
83 if (ret) {
84 pr_err("get irq group %d status failed, ret %d\n",
85 i, ret);
86 return;
87 }
88
89 irq_status = msg.data.resp.status;
90 if (!irq_status)
91 continue;
92
93 imx_scu_irq_notifier_call_chain(irq_status, &i);
94 }
95}
96
97int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
98{
99 struct imx_sc_msg_irq_enable msg;
100 struct imx_sc_rpc_msg *hdr = &msg.hdr;
101 int ret;
102
103 hdr->ver = IMX_SC_RPC_VERSION;
104 hdr->svc = IMX_SC_RPC_SVC_IRQ;
105 hdr->func = IMX_SC_IRQ_FUNC_ENABLE;
106 hdr->size = 3;
107
108 msg.resource = mu_resource_id;
109 msg.group = group;
110 msg.mask = mask;
111 msg.enable = enable;
112
113 ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
114 if (ret)
115 pr_err("enable irq failed, group %d, mask %d, ret %d\n",
116 group, mask, ret);
117
118 return ret;
119}
120EXPORT_SYMBOL(imx_scu_irq_group_enable);
121
122static void imx_scu_irq_callback(struct mbox_client *c, void *msg)
123{
124 schedule_work(&imx_sc_irq_work);
125}
126
127int imx_scu_enable_general_irq_channel(struct device *dev)
128{
129 struct of_phandle_args spec;
130 struct mbox_client *cl;
131 struct mbox_chan *ch;
132 int ret = 0, i = 0;
133
134 ret = imx_scu_get_handle(&imx_sc_irq_ipc_handle);
135 if (ret)
136 return ret;
137
138 cl = devm_kzalloc(dev, sizeof(*cl), GFP_KERNEL);
139 if (!cl)
140 return -ENOMEM;
141
142 cl->dev = dev;
143 cl->rx_callback = imx_scu_irq_callback;
144
145 /* SCU general IRQ uses general interrupt channel 3 */
146 ch = mbox_request_channel_byname(cl, "gip3");
147 if (IS_ERR(ch)) {
148 ret = PTR_ERR(ch);
149 dev_err(dev, "failed to request mbox chan gip3, ret %d\n", ret);
150 devm_kfree(dev, cl);
151 return ret;
152 }
153
154 INIT_WORK(&imx_sc_irq_work, imx_scu_irq_work_handler);
155
156 if (!of_parse_phandle_with_args(dev->of_node, "mboxes",
157 "#mbox-cells", 0, &spec))
158 i = of_alias_get_id(spec.np, "mu");
159
160 /* use mu1 as general mu irq channel if failed */
161 if (i < 0)
162 i = 1;
163
164 mu_resource_id = IMX_SC_R_MU_0A + i;
165
166 return ret;
167}
168EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);