forked from Minki/linux
4dea2d1a92
Implement vas_init() and vas_exit() functions for a new VAS module. This VAS module is essentially a library for other device drivers and kernel users of the NX coprocessors like NX-842 and NX-GZIP. In the future this will be extended to add support for user space to access the NX coprocessors. VAS is currently only supported with 64K page size. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
152 lines
3.1 KiB
C
152 lines
3.1 KiB
C
/*
|
|
* Copyright 2016-17 IBM Corp.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "vas: " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "vas.h"
|
|
|
|
static DEFINE_MUTEX(vas_mutex);
|
|
static LIST_HEAD(vas_instances);
|
|
|
|
static int init_vas_instance(struct platform_device *pdev)
|
|
{
|
|
int rc, vasid;
|
|
struct resource *res;
|
|
struct vas_instance *vinst;
|
|
struct device_node *dn = pdev->dev.of_node;
|
|
|
|
rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
|
|
if (rc) {
|
|
pr_err("No ibm,vas-id property for %s?\n", pdev->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (pdev->num_resources != 4) {
|
|
pr_err("Unexpected DT configuration for [%s, %d]\n",
|
|
pdev->name, vasid);
|
|
return -ENODEV;
|
|
}
|
|
|
|
vinst = kzalloc(sizeof(*vinst), GFP_KERNEL);
|
|
if (!vinst)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&vinst->node);
|
|
ida_init(&vinst->ida);
|
|
mutex_init(&vinst->mutex);
|
|
vinst->vas_id = vasid;
|
|
vinst->pdev = pdev;
|
|
|
|
res = &pdev->resource[0];
|
|
vinst->hvwc_bar_start = res->start;
|
|
|
|
res = &pdev->resource[1];
|
|
vinst->uwc_bar_start = res->start;
|
|
|
|
res = &pdev->resource[2];
|
|
vinst->paste_base_addr = res->start;
|
|
|
|
res = &pdev->resource[3];
|
|
if (res->end > 62) {
|
|
pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
|
|
goto free_vinst;
|
|
}
|
|
|
|
vinst->paste_win_id_shift = 63 - res->end;
|
|
|
|
pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
|
|
"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
|
|
vinst->paste_base_addr, vinst->paste_win_id_shift);
|
|
|
|
mutex_lock(&vas_mutex);
|
|
list_add(&vinst->node, &vas_instances);
|
|
mutex_unlock(&vas_mutex);
|
|
|
|
dev_set_drvdata(&pdev->dev, vinst);
|
|
|
|
return 0;
|
|
|
|
free_vinst:
|
|
kfree(vinst);
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
/*
|
|
* Although this is read/used multiple times, it is written to only
|
|
* during initialization.
|
|
*/
|
|
struct vas_instance *find_vas_instance(int vasid)
|
|
{
|
|
struct list_head *ent;
|
|
struct vas_instance *vinst;
|
|
|
|
mutex_lock(&vas_mutex);
|
|
list_for_each(ent, &vas_instances) {
|
|
vinst = list_entry(ent, struct vas_instance, node);
|
|
if (vinst->vas_id == vasid) {
|
|
mutex_unlock(&vas_mutex);
|
|
return vinst;
|
|
}
|
|
}
|
|
mutex_unlock(&vas_mutex);
|
|
|
|
pr_devel("Instance %d not found\n", vasid);
|
|
return NULL;
|
|
}
|
|
|
|
static int vas_probe(struct platform_device *pdev)
|
|
{
|
|
return init_vas_instance(pdev);
|
|
}
|
|
|
|
static const struct of_device_id powernv_vas_match[] = {
|
|
{ .compatible = "ibm,vas",},
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver vas_driver = {
|
|
.driver = {
|
|
.name = "vas",
|
|
.of_match_table = powernv_vas_match,
|
|
},
|
|
.probe = vas_probe,
|
|
};
|
|
|
|
static int __init vas_init(void)
|
|
{
|
|
int found = 0;
|
|
struct device_node *dn;
|
|
|
|
platform_driver_register(&vas_driver);
|
|
|
|
for_each_compatible_node(dn, NULL, "ibm,vas") {
|
|
of_platform_device_create(dn, NULL, NULL);
|
|
found++;
|
|
}
|
|
|
|
if (!found)
|
|
return -ENODEV;
|
|
|
|
pr_devel("Found %d instances\n", found);
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(vas_init);
|