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105 lines
2.4 KiB
105 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2017 Broadcom |
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*/ |
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/* |
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* This driver provides reset support for Broadcom FlexRM ring manager |
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* to VFIO platform. |
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*/ |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include "../vfio_platform_private.h" |
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/* FlexRM configuration */ |
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#define RING_REGS_SIZE 0x10000 |
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#define RING_VER_MAGIC 0x76303031 |
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/* Per-Ring register offsets */ |
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#define RING_VER 0x000 |
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#define RING_CONTROL 0x034 |
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#define RING_FLUSH_DONE 0x038 |
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/* Register RING_CONTROL fields */ |
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#define CONTROL_FLUSH_SHIFT 5 |
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/* Register RING_FLUSH_DONE fields */ |
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#define FLUSH_DONE_MASK 0x1 |
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static int vfio_platform_bcmflexrm_shutdown(void __iomem *ring) |
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{ |
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unsigned int timeout; |
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/* Disable/inactivate ring */ |
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writel_relaxed(0x0, ring + RING_CONTROL); |
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/* Set ring flush state */ |
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timeout = 1000; /* timeout of 1s */ |
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writel_relaxed(BIT(CONTROL_FLUSH_SHIFT), ring + RING_CONTROL); |
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do { |
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if (readl_relaxed(ring + RING_FLUSH_DONE) & |
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FLUSH_DONE_MASK) |
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break; |
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mdelay(1); |
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} while (--timeout); |
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if (!timeout) |
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return -ETIMEDOUT; |
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/* Clear ring flush state */ |
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timeout = 1000; /* timeout of 1s */ |
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writel_relaxed(0x0, ring + RING_CONTROL); |
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do { |
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if (!(readl_relaxed(ring + RING_FLUSH_DONE) & |
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FLUSH_DONE_MASK)) |
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break; |
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mdelay(1); |
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} while (--timeout); |
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if (!timeout) |
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return -ETIMEDOUT; |
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return 0; |
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} |
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static int vfio_platform_bcmflexrm_reset(struct vfio_platform_device *vdev) |
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{ |
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void __iomem *ring; |
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int rc = 0, ret = 0, ring_num = 0; |
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struct vfio_platform_region *reg = &vdev->regions[0]; |
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/* Map FlexRM ring registers if not mapped */ |
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if (!reg->ioaddr) { |
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reg->ioaddr = ioremap(reg->addr, reg->size); |
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if (!reg->ioaddr) |
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return -ENOMEM; |
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} |
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/* Discover and shutdown each FlexRM ring */ |
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for (ring = reg->ioaddr; |
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ring < (reg->ioaddr + reg->size); ring += RING_REGS_SIZE) { |
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if (readl_relaxed(ring + RING_VER) == RING_VER_MAGIC) { |
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rc = vfio_platform_bcmflexrm_shutdown(ring); |
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if (rc) { |
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dev_warn(vdev->device, |
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"FlexRM ring%d shutdown error %d\n", |
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ring_num, rc); |
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ret |= rc; |
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} |
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ring_num++; |
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} |
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} |
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return ret; |
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} |
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module_vfio_reset_handler("brcm,iproc-flexrm-mbox", |
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vfio_platform_bcmflexrm_reset); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Anup Patel <[email protected]>"); |
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MODULE_DESCRIPTION("Reset support for Broadcom FlexRM VFIO platform device");
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