+++ /dev/null
-* IBM Powerpc Virtual Accelerator Switchboard (VAS)
-
-VAS is a hardware mechanism that allows kernel subsystems and user processes
-to directly submit compression and other requests to Nest accelerators (NX)
-or other coprocessors functions.
-
-Required properties:
-- compatible : should be "ibm,vas".
-- ibm,vas-id : A unique identifier for each instance of VAS in the system
-- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor
- window context start and length, OS/User window context start and length,
- "Paste address" start and length, "Paste window id" start bit and number
- of bits)
-
-Example:
-
- vas@6019100000000 {
- compatible = "ibm,vas", "ibm,power9-vas";
- reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>;
- name = "vas";
- ibm,vas-id = <0x1>;
- };
+++ /dev/null
-/*
- * 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);
projects / mirror_ubuntu-artful-kernel.git / commitdiff