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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2020 Intel Corporation. All rights reserved. */
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/device.h>
#include <linux/module.h>
#include "cxl.h"
/**
* DOC: cxl core
*
* The CXL core provides a sysfs hierarchy for control devices and a rendezvous
* point for cross-device interleave coordination through cxl ports.
*/
/**
* cxl_setup_device_regs() - Detect CXL Device register blocks
* @dev: Host device of the @base mapping
* @base: Mapping of CXL 2.0 8.2.8 CXL Device Register Interface
* @regs: Base pointers for device register blocks (see CXL_DEVICE_REGS())
*/
void cxl_setup_device_regs(struct device *dev, void __iomem *base,
struct cxl_device_regs *regs)
{
int cap, cap_count;
u64 cap_array;
*regs = (struct cxl_device_regs) { 0 };
cap_array = readq(base + CXLDEV_CAP_ARRAY_OFFSET);
if (FIELD_GET(CXLDEV_CAP_ARRAY_ID_MASK, cap_array) !=
CXLDEV_CAP_ARRAY_CAP_ID)
return;
cap_count = FIELD_GET(CXLDEV_CAP_ARRAY_COUNT_MASK, cap_array);
for (cap = 1; cap <= cap_count; cap++) {
void __iomem *register_block;
u32 offset;
u16 cap_id;
cap_id = FIELD_GET(CXLDEV_CAP_HDR_CAP_ID_MASK,
readl(base + cap * 0x10));
offset = readl(base + cap * 0x10 + 0x4);
register_block = base + offset;
switch (cap_id) {
case CXLDEV_CAP_CAP_ID_DEVICE_STATUS:
dev_dbg(dev, "found Status capability (0x%x)\n", offset);
regs->status = register_block;
break;
case CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX:
dev_dbg(dev, "found Mailbox capability (0x%x)\n", offset);
regs->mbox = register_block;
break;
case CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX:
dev_dbg(dev, "found Secondary Mailbox capability (0x%x)\n", offset);
break;
case CXLDEV_CAP_CAP_ID_MEMDEV:
dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset);
regs->memdev = register_block;
break;
default:
dev_dbg(dev, "Unknown cap ID: %d (0x%x)\n", cap_id, offset);
break;
}
}
}
EXPORT_SYMBOL_GPL(cxl_setup_device_regs);
struct bus_type cxl_bus_type = {
.name = "cxl",
};
EXPORT_SYMBOL_GPL(cxl_bus_type);
static __init int cxl_core_init(void)
{
return bus_register(&cxl_bus_type);
}
static void cxl_core_exit(void)
{
bus_unregister(&cxl_bus_type);
}
module_init(cxl_core_init);
module_exit(cxl_core_exit);
MODULE_LICENSE("GPL v2");
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