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authorAnup Patel <anup.patel@broadcom.com>2017-10-20 11:43:24 -0600
committerAlex Williamson <alex.williamson@redhat.com>2017-10-20 11:43:24 -0600
commite25883411e80f314f0f76c8eeacd1b47d7e4805b (patch)
tree6aeaad0fa4c9e03a9e6635cf6890f00ed55fcadb /drivers/vfio
parent79d40370e8d31886a9413e2ee115fc426b4ae97e (diff)
downloadop-kernel-dev-e25883411e80f314f0f76c8eeacd1b47d7e4805b.zip
op-kernel-dev-e25883411e80f314f0f76c8eeacd1b47d7e4805b.tar.gz
vfio: platform: reset: Add Broadcom FlexRM reset module
This patch adds Broadcom FlexRM low-level reset for VFIO platform. It will do the following: 1. Disable/Deactivate each FlexRM ring 2. Flush each FlexRM ring The cleanup sequence for FlexRM rings is adapted from Broadcom FlexRM mailbox driver. Signed-off-by: Anup Patel <anup.patel@broadcom.com> Reviewed-by: Oza Oza <oza.oza@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/platform/reset/Kconfig9
-rw-r--r--drivers/vfio/platform/reset/Makefile1
-rw-r--r--drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c113
3 files changed, 123 insertions, 0 deletions
diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig
index 70cccc5..392e3c0 100644
--- a/drivers/vfio/platform/reset/Kconfig
+++ b/drivers/vfio/platform/reset/Kconfig
@@ -13,3 +13,12 @@ config VFIO_PLATFORM_AMDXGBE_RESET
Enables the VFIO platform driver to handle reset for AMD XGBE
If you don't know what to do here, say N.
+
+config VFIO_PLATFORM_BCMFLEXRM_RESET
+ tristate "VFIO support for Broadcom FlexRM reset"
+ depends on VFIO_PLATFORM && (ARCH_BCM_IPROC || COMPILE_TEST)
+ default ARCH_BCM_IPROC
+ help
+ Enables the VFIO platform driver to handle reset for Broadcom FlexRM
+
+ If you don't know what to do here, say N.
diff --git a/drivers/vfio/platform/reset/Makefile b/drivers/vfio/platform/reset/Makefile
index 93f4e23..8d9874b 100644
--- a/drivers/vfio/platform/reset/Makefile
+++ b/drivers/vfio/platform/reset/Makefile
@@ -5,3 +5,4 @@ ccflags-y += -Idrivers/vfio/platform
obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o
obj-$(CONFIG_VFIO_PLATFORM_AMDXGBE_RESET) += vfio-platform-amdxgbe.o
+obj-$(CONFIG_VFIO_PLATFORM_BCMFLEXRM_RESET) += vfio_platform_bcmflexrm.o
diff --git a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
new file mode 100644
index 0000000..d45c3be
--- /dev/null
+++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2017 Broadcom
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * 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];
+
+ /* Map FlexRM ring registers if not mapped */
+ if (!reg->ioaddr) {
+ reg->ioaddr = ioremap_nocache(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");
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