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iop-module-sysfs.c
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iop-module-sysfs.c
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// SPDX-License-Identifier: GPL-2.0
/*
* PlayStation 2 I/O processor (IOP)
*
* Copyright (C) 2019 Fredrik Noring
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/firmware.h>
#include <asm/mach-ps2/iop-memory.h>
#define DEVICE_NAME "iop"
/* FIXME: What does these fields mean? */
struct iop_module_info {
iop_addr_t next; /* IOP address to the next module, or zero */
iop_addr_t name; /* IOP address to the module name */
u16 version;
u16 newflags;
u16 id;
u16 flags;
iop_addr_t entry;
iop_addr_t gp;
iop_addr_t text_start;
u32 text_size;
u32 data_size;
u32 bss_size;
u32 unused1;
u32 unused2;
};
static struct kobject *modules_kobj; /* FIXME: Private device pointer */
static void *iop_to_virt(iop_addr_t iop_addr)
{
return phys_to_virt(iop_bus_to_phys(iop_addr));
}
#define IOP_MODULE_BASE 0x800
/* FIXME: What does the empty module list look like? */
/* FIXME: Use a memory barrier */
#define iop_for_each_module(pos) \
for ((pos) = iop_to_virt(IOP_MODULE_BASE); \
(pos) != NULL; \
(pos) = (pos)->next ? iop_to_virt((pos)->next) : NULL)
static const char *iop_module_name(const struct iop_module_info *module)
{
return iop_to_virt(module->name);
}
const struct iop_module_info *iop_module_from_kobj(const struct kobject *kobj)
{
const int id = simple_strtoull(kobj->name, NULL, 0);
const struct iop_module_info *module;
iop_for_each_module(module)
if (module->id == id)
return module;
return NULL;
}
static ssize_t iop_module_name_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"%s\n", iop_module_name(module)) : 0;
}
static ssize_t iop_module_id_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE, "%u\n", module->id) : 0;
}
static ssize_t iop_module_version_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"%u.%u\n", module->version >> 8, module->version & 0xff) : 0;
}
static ssize_t iop_module_flags_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"0x%08x\n", module->flags) : 0;
}
static ssize_t iop_module_newflags_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"0x%08x\n", module->newflags) : 0;
}
static ssize_t iop_module_entry_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"0x%08x\n", module->entry) : 0;
}
static ssize_t iop_module_gp_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE, "0x%08x\n", module->gp) : 0;
}
static ssize_t iop_module_text_start_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"0x%08x\n", module->text_start) : 0;
}
static ssize_t iop_module_text_size_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"%u\n", module->text_size) : 0;
}
static ssize_t iop_module_data_size_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"%u\n", module->data_size) : 0;
}
static ssize_t iop_module_bss_size_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
const struct iop_module_info *module = iop_module_from_kobj(kobj);
return module ? scnprintf(buf, PAGE_SIZE,
"%u\n", module->bss_size) : 0;
}
#define DEFINE_IOP_MODULE_FIELD_ATTR(field) \
static struct kobj_attribute iop_module_attribute_##field = \
__ATTR(field, S_IRUGO, iop_module_##field##_show, NULL)
DEFINE_IOP_MODULE_FIELD_ATTR(name);
DEFINE_IOP_MODULE_FIELD_ATTR(id);
DEFINE_IOP_MODULE_FIELD_ATTR(version);
DEFINE_IOP_MODULE_FIELD_ATTR(flags);
DEFINE_IOP_MODULE_FIELD_ATTR(newflags);
DEFINE_IOP_MODULE_FIELD_ATTR(entry);
DEFINE_IOP_MODULE_FIELD_ATTR(gp);
DEFINE_IOP_MODULE_FIELD_ATTR(text_start);
DEFINE_IOP_MODULE_FIELD_ATTR(text_size);
DEFINE_IOP_MODULE_FIELD_ATTR(data_size);
DEFINE_IOP_MODULE_FIELD_ATTR(bss_size);
static struct attribute *iop_modules_attributes[] = {
&iop_module_attribute_name.attr,
&iop_module_attribute_id.attr,
&iop_module_attribute_version.attr,
&iop_module_attribute_flags.attr,
&iop_module_attribute_newflags.attr,
&iop_module_attribute_entry.attr,
&iop_module_attribute_gp.attr,
&iop_module_attribute_text_start.attr,
&iop_module_attribute_text_size.attr,
&iop_module_attribute_data_size.attr,
&iop_module_attribute_bss_size.attr,
NULL
};
static struct attribute_group iop_modules_attribute_group = {
.attrs = iop_modules_attributes
};
static int iop_modules_create_sysfs(struct device *dev)
{
const struct iop_module_info *module;
int err = 0;
modules_kobj = kobject_create_and_add("iop", firmware_kobj);
if (!modules_kobj)
return -ENOMEM;
iop_for_each_module(module) {
struct kobject *kobj;
char id_string[20];
scnprintf(id_string, sizeof(id_string), "%d", module->id);
kobj = kobject_create_and_add(id_string, modules_kobj);
if (!kobj) {
err = -ENOMEM;
goto out_err;
}
err = sysfs_create_group(kobj, &iop_modules_attribute_group);
if (err)
goto out_err;
}
return 0;
out_err:
kobject_del(modules_kobj);
modules_kobj = NULL;
return err;
}
static void iop_modules_remove_sysfs(struct device *dev)
{
kobject_del(modules_kobj);
}
static int iop_probe(struct platform_device *pdev)
{
int err;
// FIXME: platform_get_resource(pdev, IORESOURCE_MEM, 0);
err = iop_modules_create_sysfs(&pdev->dev);
return err;
}
static int iop_remove(struct platform_device *pdev)
{
iop_modules_remove_sysfs(&pdev->dev);
return 0;
}
static struct platform_driver iop_driver = {
.probe = iop_probe,
.remove = iop_remove,
.driver = {
.name = DEVICE_NAME,
},
};
static int __init iop_init(void)
{
return platform_driver_register(&iop_driver);
}
static void __exit iop_exit(void)
{
platform_driver_unregister(&iop_driver);
}
module_init(iop_init);
module_exit(iop_exit);
MODULE_LICENSE("GPL");