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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_graph.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/amba/bus.h>
#include <linux/coresight.h>
#include <asm/smp_plat.h>
static int of_dev_node_match(struct device *dev, void *data)
{
return dev->of_node == data;
}
static struct device *
of_coresight_get_endpoint_device(struct device_node *endpoint)
{
struct device *dev = NULL;
/*
* If we have a non-configuable replicator, it will be found on the
* platform bus.
*/
dev = bus_find_device(&platform_bus_type, NULL,
endpoint, of_dev_node_match);
if (dev)
return dev;
/*
* We have a configurable component - circle through the AMBA bus
* looking for the device that matches the endpoint node.
*/
return bus_find_device(&amba_bustype, NULL,
endpoint, of_dev_node_match);
}
static struct device_node *of_get_coresight_endpoint(
const struct device_node *parent, struct device_node *prev)
{
struct device_node *node = of_graph_get_next_endpoint(parent, prev);
of_node_put(prev);
return node;
}
static void of_coresight_get_ports(struct device_node *node,
int *nr_inport, int *nr_outport)
{
struct device_node *ep = NULL;
int in = 0, out = 0;
do {
ep = of_get_coresight_endpoint(node, ep);
if (!ep)
break;
if (of_property_read_bool(ep, "slave-mode"))
in++;
else
out++;
} while (ep);
*nr_inport = in;
*nr_outport = out;
}
static int of_coresight_alloc_memory(struct device *dev,
struct coresight_platform_data *pdata)
{
/* List of output port on this component */
pdata->outports = devm_kzalloc(dev, pdata->nr_outport *
sizeof(*pdata->outports),
GFP_KERNEL);
if (!pdata->outports)
return -ENOMEM;
/* Children connected to this component via @outports */
pdata->child_names = devm_kzalloc(dev, pdata->nr_outport *
sizeof(*pdata->child_names),
GFP_KERNEL);
if (!pdata->child_names)
return -ENOMEM;
/* Port number on the child this component is connected to */
pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport *
sizeof(*pdata->child_ports),
GFP_KERNEL);
if (!pdata->child_ports)
return -ENOMEM;
return 0;
}
struct coresight_platform_data *of_get_coresight_platform_data(
struct device *dev, struct device_node *node)
{
int i = 0, ret = 0;
struct coresight_platform_data *pdata;
struct of_endpoint endpoint, rendpoint;
struct device *rdev;
struct device_node *dn;
struct device_node *ep = NULL;
struct device_node *rparent = NULL;
struct device_node *rport = NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
/* Use device name as sysfs handle */
pdata->name = dev_name(dev);
/* Get the number of input and output port for this component */
of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
if (pdata->nr_outport) {
ret = of_coresight_alloc_memory(dev, pdata);
if (ret)
return ERR_PTR(ret);
/* Iterate through each port to discover topology */
do {
/* Get a handle on a port */
ep = of_get_coresight_endpoint(node, ep);
if (!ep)
break;
/*
* No need to deal with input ports, processing for as
* processing for output ports will deal with them.
*/
if (of_find_property(ep, "slave-mode", NULL))
continue;
/* Get a handle on the local endpoint */
ret = of_graph_parse_endpoint(ep, &endpoint);
if (ret)
continue;
/* The local out port number */
pdata->outports[i] = endpoint.id;
/*
* Get a handle on the remote port and parent
* attached to it.
*/
rparent = of_graph_get_remote_port_parent(ep);
rport = of_graph_get_remote_port(ep);
if (!rparent || !rport)
continue;
if (of_graph_parse_endpoint(rport, &rendpoint))
continue;
rdev = of_coresight_get_endpoint_device(rparent);
if (!rdev)
continue;
pdata->child_names[i] = dev_name(rdev);
pdata->child_ports[i] = rendpoint.id;
i++;
} while (ep);
}
/* Affinity defaults to CPU0 */
pdata->cpu = 0;
dn = of_parse_phandle(node, "cpu", 0);
if (dn) {
const u32 *cell;
int len, index;
u64 hwid;
cell = of_get_property(dn, "reg", &len);
if (cell) {
hwid = of_read_number(cell, of_n_addr_cells(dn));
index = get_logical_index(hwid);
if (index != -EINVAL)
pdata->cpu = index;
}
}
return pdata;
}
EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
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