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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 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/of_address.h> | |
20 | #include <linux/of_graph.h> | |
21 | #include <linux/of_platform.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/amba/bus.h> | |
24 | #include <linux/coresight.h> | |
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 | /* | |
39 | * If we have a non-configuable replicator, it will be found on the | |
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 | ||
55 | static struct device_node *of_get_coresight_endpoint( | |
56 | const struct device_node *parent, struct device_node *prev) | |
57 | { | |
58 | struct device_node *node = of_graph_get_next_endpoint(parent, prev); | |
59 | ||
60 | of_node_put(prev); | |
61 | return node; | |
62 | } | |
63 | ||
64 | static void of_coresight_get_ports(struct device_node *node, | |
65 | int *nr_inport, int *nr_outport) | |
66 | { | |
67 | struct device_node *ep = NULL; | |
68 | int in = 0, out = 0; | |
69 | ||
70 | do { | |
71 | ep = of_get_coresight_endpoint(node, ep); | |
72 | if (!ep) | |
73 | break; | |
74 | ||
75 | if (of_property_read_bool(ep, "slave-mode")) | |
76 | in++; | |
77 | else | |
78 | out++; | |
79 | ||
80 | } while (ep); | |
81 | ||
82 | *nr_inport = in; | |
83 | *nr_outport = out; | |
84 | } | |
85 | ||
86 | static int of_coresight_alloc_memory(struct device *dev, | |
87 | struct coresight_platform_data *pdata) | |
88 | { | |
89 | /* List of output port on this component */ | |
90 | pdata->outports = devm_kzalloc(dev, pdata->nr_outport * | |
91 | sizeof(*pdata->outports), | |
92 | GFP_KERNEL); | |
93 | if (!pdata->outports) | |
94 | return -ENOMEM; | |
95 | ||
96 | /* Children connected to this component via @outport */ | |
97 | pdata->child_names = devm_kzalloc(dev, pdata->nr_outport * | |
98 | sizeof(*pdata->child_names), | |
99 | GFP_KERNEL); | |
100 | if (!pdata->child_names) | |
101 | return -ENOMEM; | |
102 | ||
103 | /* Port number on the child this component is connected to */ | |
104 | pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport * | |
105 | sizeof(*pdata->child_ports), | |
106 | GFP_KERNEL); | |
107 | if (!pdata->child_ports) | |
108 | return -ENOMEM; | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | struct coresight_platform_data *of_get_coresight_platform_data( | |
114 | struct device *dev, struct device_node *node) | |
115 | { | |
116 | int i = 0, ret = 0; | |
117 | struct coresight_platform_data *pdata; | |
118 | struct of_endpoint endpoint, rendpoint; | |
119 | struct device *rdev; | |
120 | struct device_node *cpu; | |
121 | struct device_node *ep = NULL; | |
122 | struct device_node *rparent = NULL; | |
123 | struct device_node *rport = NULL; | |
124 | ||
125 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
126 | if (!pdata) | |
127 | return ERR_PTR(-ENOMEM); | |
128 | ||
129 | /* Use device name as debugfs handle */ | |
130 | pdata->name = dev_name(dev); | |
131 | ||
132 | /* Get the number of input and output port for this component */ | |
133 | of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport); | |
134 | ||
135 | if (pdata->nr_outport) { | |
136 | ret = of_coresight_alloc_memory(dev, pdata); | |
137 | if (ret) | |
138 | return ERR_PTR(ret); | |
139 | ||
140 | /* Iterate through each port to discover topology */ | |
141 | do { | |
142 | /* Get a handle on a port */ | |
143 | ep = of_get_coresight_endpoint(node, ep); | |
144 | if (!ep) | |
145 | break; | |
146 | ||
147 | /* | |
148 | * No need to deal with input ports, processing for as | |
149 | * processing for output ports will deal with them. | |
150 | */ | |
151 | if (of_find_property(ep, "slave-mode", NULL)) | |
152 | continue; | |
153 | ||
154 | /* Get a handle on the local endpoint */ | |
155 | ret = of_graph_parse_endpoint(ep, &endpoint); | |
156 | ||
157 | if (ret) | |
158 | continue; | |
159 | ||
160 | /* The local out port number */ | |
161 | pdata->outports[i] = endpoint.id; | |
162 | ||
163 | /* | |
164 | * Get a handle on the remote port and parent | |
165 | * attached to it. | |
166 | */ | |
167 | rparent = of_graph_get_remote_port_parent(ep); | |
168 | rport = of_graph_get_remote_port(ep); | |
169 | ||
170 | if (!rparent || !rport) | |
171 | continue; | |
172 | ||
173 | if (of_graph_parse_endpoint(rport, &rendpoint)) | |
174 | continue; | |
175 | ||
176 | rdev = of_coresight_get_endpoint_device(rparent); | |
177 | if (!dev) | |
178 | continue; | |
179 | ||
180 | pdata->child_names[i] = dev_name(rdev); | |
181 | pdata->child_ports[i] = rendpoint.id; | |
182 | ||
183 | i++; | |
184 | } while (ep); | |
185 | } | |
186 | ||
187 | /* Affinity defaults to CPU0 */ | |
188 | pdata->cpu = 0; | |
189 | cpu = of_parse_phandle(node, "cpu", 0); | |
190 | if (cpu) { | |
191 | const u32 *mpidr; | |
192 | int len, index; | |
193 | ||
194 | mpidr = of_get_property(cpu, "reg", &len); | |
195 | if (mpidr && len == 4) { | |
196 | index = get_logical_index(be32_to_cpup(mpidr)); | |
197 | if (index != -EINVAL) | |
198 | pdata->cpu = index; | |
199 | } | |
200 | } | |
201 | ||
202 | return pdata; | |
203 | } | |
204 | EXPORT_SYMBOL_GPL(of_get_coresight_platform_data); |