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a06ae860 PP |
1 | /* Copyright (c) 2012, The Linux Foundation. All rights reserved. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 and | |
5 | * only version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | */ | |
12 | ||
a06ae860 PP |
13 | #include <linux/types.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/clk.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/of_address.h> | |
19 | #include <linux/of_graph.h> | |
20 | #include <linux/of_platform.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/amba/bus.h> | |
23 | #include <linux/coresight.h> | |
8c02a5ba | 24 | #include <linux/cpumask.h> |
a06ae860 PP |
25 | #include <asm/smp_plat.h> |
26 | ||
27 | ||
28 | static int of_dev_node_match(struct device *dev, void *data) | |
29 | { | |
30 | return dev->of_node == data; | |
31 | } | |
32 | ||
33 | static struct device * | |
34 | of_coresight_get_endpoint_device(struct device_node *endpoint) | |
35 | { | |
36 | struct device *dev = NULL; | |
37 | ||
38 | /* | |
43701236 | 39 | * If we have a non-configurable replicator, it will be found on the |
a06ae860 PP |
40 | * platform bus. |
41 | */ | |
42 | dev = bus_find_device(&platform_bus_type, NULL, | |
43 | endpoint, of_dev_node_match); | |
44 | if (dev) | |
45 | return dev; | |
46 | ||
47 | /* | |
48 | * We have a configurable component - circle through the AMBA bus | |
49 | * looking for the device that matches the endpoint node. | |
50 | */ | |
51 | return bus_find_device(&amba_bustype, NULL, | |
52 | endpoint, of_dev_node_match); | |
53 | } | |
54 | ||
a06ae860 PP |
55 | static void of_coresight_get_ports(struct device_node *node, |
56 | int *nr_inport, int *nr_outport) | |
57 | { | |
58 | struct device_node *ep = NULL; | |
59 | int in = 0, out = 0; | |
60 | ||
61 | do { | |
f033c0bc | 62 | ep = of_graph_get_next_endpoint(node, ep); |
a06ae860 PP |
63 | if (!ep) |
64 | break; | |
65 | ||
66 | if (of_property_read_bool(ep, "slave-mode")) | |
67 | in++; | |
68 | else | |
69 | out++; | |
70 | ||
71 | } while (ep); | |
72 | ||
73 | *nr_inport = in; | |
74 | *nr_outport = out; | |
75 | } | |
76 | ||
77 | static int of_coresight_alloc_memory(struct device *dev, | |
78 | struct coresight_platform_data *pdata) | |
79 | { | |
80 | /* List of output port on this component */ | |
81 | pdata->outports = devm_kzalloc(dev, pdata->nr_outport * | |
82 | sizeof(*pdata->outports), | |
83 | GFP_KERNEL); | |
84 | if (!pdata->outports) | |
85 | return -ENOMEM; | |
86 | ||
f7c55298 | 87 | /* Children connected to this component via @outports */ |
bf16e5b8 | 88 | pdata->child_names = devm_kzalloc(dev, pdata->nr_outport * |
a06ae860 PP |
89 | sizeof(*pdata->child_names), |
90 | GFP_KERNEL); | |
91 | if (!pdata->child_names) | |
92 | return -ENOMEM; | |
93 | ||
94 | /* Port number on the child this component is connected to */ | |
95 | pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport * | |
96 | sizeof(*pdata->child_ports), | |
97 | GFP_KERNEL); | |
98 | if (!pdata->child_ports) | |
99 | return -ENOMEM; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | struct coresight_platform_data *of_get_coresight_platform_data( | |
105 | struct device *dev, struct device_node *node) | |
106 | { | |
8c02a5ba | 107 | int i = 0, ret = 0, cpu; |
a06ae860 PP |
108 | struct coresight_platform_data *pdata; |
109 | struct of_endpoint endpoint, rendpoint; | |
110 | struct device *rdev; | |
34a03c1d | 111 | struct device_node *dn; |
a06ae860 PP |
112 | struct device_node *ep = NULL; |
113 | struct device_node *rparent = NULL; | |
114 | struct device_node *rport = NULL; | |
115 | ||
116 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
117 | if (!pdata) | |
118 | return ERR_PTR(-ENOMEM); | |
119 | ||
ff1e33b0 | 120 | /* Use device name as sysfs handle */ |
a06ae860 PP |
121 | pdata->name = dev_name(dev); |
122 | ||
123 | /* Get the number of input and output port for this component */ | |
124 | of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport); | |
125 | ||
126 | if (pdata->nr_outport) { | |
127 | ret = of_coresight_alloc_memory(dev, pdata); | |
128 | if (ret) | |
129 | return ERR_PTR(ret); | |
130 | ||
131 | /* Iterate through each port to discover topology */ | |
132 | do { | |
133 | /* Get a handle on a port */ | |
f033c0bc | 134 | ep = of_graph_get_next_endpoint(node, ep); |
a06ae860 PP |
135 | if (!ep) |
136 | break; | |
137 | ||
138 | /* | |
139 | * No need to deal with input ports, processing for as | |
140 | * processing for output ports will deal with them. | |
141 | */ | |
142 | if (of_find_property(ep, "slave-mode", NULL)) | |
143 | continue; | |
144 | ||
145 | /* Get a handle on the local endpoint */ | |
146 | ret = of_graph_parse_endpoint(ep, &endpoint); | |
147 | ||
148 | if (ret) | |
149 | continue; | |
150 | ||
151 | /* The local out port number */ | |
152 | pdata->outports[i] = endpoint.id; | |
153 | ||
154 | /* | |
155 | * Get a handle on the remote port and parent | |
156 | * attached to it. | |
157 | */ | |
158 | rparent = of_graph_get_remote_port_parent(ep); | |
159 | rport = of_graph_get_remote_port(ep); | |
160 | ||
161 | if (!rparent || !rport) | |
162 | continue; | |
163 | ||
164 | if (of_graph_parse_endpoint(rport, &rendpoint)) | |
165 | continue; | |
166 | ||
167 | rdev = of_coresight_get_endpoint_device(rparent); | |
2ccffaf9 | 168 | if (!rdev) |
a06ae860 PP |
169 | continue; |
170 | ||
171 | pdata->child_names[i] = dev_name(rdev); | |
172 | pdata->child_ports[i] = rendpoint.id; | |
173 | ||
174 | i++; | |
175 | } while (ep); | |
176 | } | |
177 | ||
178 | /* Affinity defaults to CPU0 */ | |
179 | pdata->cpu = 0; | |
34a03c1d | 180 | dn = of_parse_phandle(node, "cpu", 0); |
8c02a5ba MP |
181 | for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) { |
182 | if (dn == of_get_cpu_node(cpu, NULL)) { | |
183 | pdata->cpu = cpu; | |
184 | break; | |
a06ae860 PP |
185 | } |
186 | } | |
187 | ||
188 | return pdata; | |
189 | } | |
190 | EXPORT_SYMBOL_GPL(of_get_coresight_platform_data); |