1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2019 NXP
*
* Implementation of the SCU IRQ functions using MU.
*
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/firmware/imx/ipc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/mailbox_client.h>
#define IMX_SC_IRQ_FUNC_ENABLE 1
#define IMX_SC_IRQ_FUNC_STATUS 2
#define IMX_SC_IRQ_NUM_GROUP 4
static u32 mu_resource_id;
struct imx_sc_msg_irq_get_status {
struct imx_sc_rpc_msg hdr;
union {
struct {
u16 resource;
u8 group;
u8 reserved;
} __packed req;
struct {
u32 status;
} resp;
} data;
};
struct imx_sc_msg_irq_enable {
struct imx_sc_rpc_msg hdr;
u32 mask;
u16 resource;
u8 group;
u8 enable;
} __packed;
static struct imx_sc_ipc *imx_sc_irq_ipc_handle;
static struct work_struct imx_sc_irq_work;
static ATOMIC_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
int imx_scu_irq_register_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(
&imx_scu_irq_notifier_chain, nb);
}
EXPORT_SYMBOL(imx_scu_irq_register_notifier);
int imx_scu_irq_unregister_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(
&imx_scu_irq_notifier_chain, nb);
}
EXPORT_SYMBOL(imx_scu_irq_unregister_notifier);
static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
{
return atomic_notifier_call_chain(&imx_scu_irq_notifier_chain,
status, (void *)group);
}
static void imx_scu_irq_work_handler(struct work_struct *work)
{
struct imx_sc_msg_irq_get_status msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
u32 irq_status;
int ret;
u8 i;
for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_IRQ;
hdr->func = IMX_SC_IRQ_FUNC_STATUS;
hdr->size = 2;
msg.data.req.resource = mu_resource_id;
msg.data.req.group = i;
ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
if (ret) {
pr_err("get irq group %d status failed, ret %d\n",
i, ret);
return;
}
irq_status = msg.data.resp.status;
if (!irq_status)
continue;
imx_scu_irq_notifier_call_chain(irq_status, &i);
}
}
int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
{
struct imx_sc_msg_irq_enable msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
int ret;
if (!imx_sc_irq_ipc_handle)
return -EPROBE_DEFER;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_IRQ;
hdr->func = IMX_SC_IRQ_FUNC_ENABLE;
hdr->size = 3;
msg.resource = mu_resource_id;
msg.group = group;
msg.mask = mask;
msg.enable = enable;
ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
if (ret)
pr_err("enable irq failed, group %d, mask %d, ret %d\n",
group, mask, ret);
return ret;
}
EXPORT_SYMBOL(imx_scu_irq_group_enable);
static void imx_scu_irq_callback(struct mbox_client *c, void *msg)
{
schedule_work(&imx_sc_irq_work);
}
int imx_scu_enable_general_irq_channel(struct device *dev)
{
struct of_phandle_args spec;
struct mbox_client *cl;
struct mbox_chan *ch;
int ret = 0, i = 0;
ret = imx_scu_get_handle(&imx_sc_irq_ipc_handle);
if (ret)
return ret;
cl = devm_kzalloc(dev, sizeof(*cl), GFP_KERNEL);
if (!cl)
return -ENOMEM;
cl->dev = dev;
cl->rx_callback = imx_scu_irq_callback;
/* SCU general IRQ uses general interrupt channel 3 */
ch = mbox_request_channel_byname(cl, "gip3");
if (IS_ERR(ch)) {
ret = PTR_ERR(ch);
dev_err(dev, "failed to request mbox chan gip3, ret %d\n", ret);
devm_kfree(dev, cl);
return ret;
}
INIT_WORK(&imx_sc_irq_work, imx_scu_irq_work_handler);
if (!of_parse_phandle_with_args(dev->of_node, "mboxes",
"#mbox-cells", 0, &spec))
i = of_alias_get_id(spec.np, "mu");
/* use mu1 as general mu irq channel if failed */
if (i < 0)
i = 1;
mu_resource_id = IMX_SC_R_MU_0A + i;
return ret;
}
EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);
|
