mirror of
https://github.com/torvalds/linux.git
synced 2026-04-26 10:32:25 -04:00
801ca4ce0b
While vfio-platform itself is on a reprieve from being removed[1], these reset drivers don't support any current hardware, are not being tested, and suggest a level of support that doesn't really exist. Mark them for removal to surface any remaining user such that we can potentially drop them and simplify the code if none appear. Link: https://lore.kernel.org/all/20250806170314.3768750-3-alex.williamson@redhat.com [1] Reviewed-by: Pranjal Shrivastava <praan@google.com> Reviewed-by: Mostafa Saleh <smostafa@google.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Link: https://lore.kernel.org/r/20250825175807.3264083-3-alex.williamson@redhat.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2017 Broadcom
|
|
*/
|
|
|
|
/*
|
|
* This driver provides reset support for Broadcom FlexRM ring manager
|
|
* to VFIO platform.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "../vfio_platform_private.h"
|
|
|
|
/* FlexRM configuration */
|
|
#define RING_REGS_SIZE 0x10000
|
|
#define RING_VER_MAGIC 0x76303031
|
|
|
|
/* Per-Ring register offsets */
|
|
#define RING_VER 0x000
|
|
#define RING_CONTROL 0x034
|
|
#define RING_FLUSH_DONE 0x038
|
|
|
|
/* Register RING_CONTROL fields */
|
|
#define CONTROL_FLUSH_SHIFT 5
|
|
|
|
/* Register RING_FLUSH_DONE fields */
|
|
#define FLUSH_DONE_MASK 0x1
|
|
|
|
static int vfio_platform_bcmflexrm_shutdown(void __iomem *ring)
|
|
{
|
|
unsigned int timeout;
|
|
|
|
/* Disable/inactivate ring */
|
|
writel_relaxed(0x0, ring + RING_CONTROL);
|
|
|
|
/* Set ring flush state */
|
|
timeout = 1000; /* timeout of 1s */
|
|
writel_relaxed(BIT(CONTROL_FLUSH_SHIFT), ring + RING_CONTROL);
|
|
do {
|
|
if (readl_relaxed(ring + RING_FLUSH_DONE) &
|
|
FLUSH_DONE_MASK)
|
|
break;
|
|
mdelay(1);
|
|
} while (--timeout);
|
|
if (!timeout)
|
|
return -ETIMEDOUT;
|
|
|
|
/* Clear ring flush state */
|
|
timeout = 1000; /* timeout of 1s */
|
|
writel_relaxed(0x0, ring + RING_CONTROL);
|
|
do {
|
|
if (!(readl_relaxed(ring + RING_FLUSH_DONE) &
|
|
FLUSH_DONE_MASK))
|
|
break;
|
|
mdelay(1);
|
|
} while (--timeout);
|
|
if (!timeout)
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev)
|
|
{
|
|
void __iomem *ring;
|
|
int rc = 0, ret = 0, ring_num = 0;
|
|
struct vfio_platform_region *reg = &vdev->regions[0];
|
|
|
|
dev_err_once(vdev->device, "DEPRECATION: VFIO Broadcom FlexRM platform reset is deprecated and will be removed in a future kernel release\n");
|
|
|
|
/* Map FlexRM ring registers if not mapped */
|
|
if (!reg->ioaddr) {
|
|
reg->ioaddr = ioremap(reg->addr, reg->size);
|
|
if (!reg->ioaddr)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Discover and shutdown each FlexRM ring */
|
|
for (ring = reg->ioaddr;
|
|
ring < (reg->ioaddr + reg->size); ring += RING_REGS_SIZE) {
|
|
if (readl_relaxed(ring + RING_VER) == RING_VER_MAGIC) {
|
|
rc = vfio_platform_bcmflexrm_shutdown(ring);
|
|
if (rc) {
|
|
dev_warn(vdev->device,
|
|
"FlexRM ring%d shutdown error %d\n",
|
|
ring_num, rc);
|
|
ret |= rc;
|
|
}
|
|
ring_num++;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
module_vfio_reset_handler("brcm,iproc-flexrm-mbox",
|
|
vfio_platform_bcmflexrm_reset);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Anup Patel <anup.patel@broadcom.com>");
|
|
MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");
|