From: Sinan Kaya <okaya@codeaurora.org>
To: dmaengine@vger.kernel.org, marc.zyngier@arm.com,
mark.rutland@arm.com, timur@codeaurora.org,
devicetree@vger.kernel.org, cov@codeaurora.org,
vinod.koul@intel.com, jcm@redhat.com
Cc: shankerd@codeaurora.org, vikrams@codeaurora.org,
eric.auger@linaro.org, agross@codeaurora.org, arnd@arndb.de,
linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Sinan Kaya <okaya@codeaurora.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH V14 9/9] vfio, platform: add QTI HIDMA reset driver
Date: Thu, 4 Feb 2016 23:34:40 -0500 [thread overview]
Message-ID: <1454646882-24369-10-git-send-email-okaya@codeaurora.org> (raw)
In-Reply-To: <1454646882-24369-1-git-send-email-okaya@codeaurora.org>
In situations where the userspace driver is stopped abnormally and the
VFIO platform device is released, the assigned HW device currently is
left running. As a consequence the HW device might continue issuing IRQs
and performing DMA accesses.
This patch is implementing a reset driver for HIDMA platform driver.
This gets called by the VFIO platform reset interface.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/vfio/platform/reset/Kconfig | 9 ++
drivers/vfio/platform/reset/Makefile | 2 +
.../vfio/platform/reset/vfio_platform_qcomhidma.c | 99 ++++++++++++++++++++++
3 files changed, 110 insertions(+)
create mode 100644 drivers/vfio/platform/reset/vfio_platform_qcomhidma.c
diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig
index 70cccc5..d02b3b5 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_QCOMHIDMA_RESET
+ tristate "VFIO support for Qualcomm Technologies HIDMA reset"
+ depends on VFIO_PLATFORM
+ help
+ Enables the VFIO platform driver to handle reset for Qualcomm Technologies
+ HIDMA Channel.
+
+ 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..ec7748a 100644
--- a/drivers/vfio/platform/reset/Makefile
+++ b/drivers/vfio/platform/reset/Makefile
@@ -1,7 +1,9 @@
vfio-platform-calxedaxgmac-y := vfio_platform_calxedaxgmac.o
vfio-platform-amdxgbe-y := vfio_platform_amdxgbe.o
+vfio-platform-qcomhidma-y := vfio_platform_qcomhidma.o
ccflags-y += -Idrivers/vfio/platform
obj-$(CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET) += vfio-platform-calxedaxgmac.o
+obj-$(CONFIG_VFIO_PLATFORM_QCOMHIDMA_RESET) += vfio-platform-qcomhidma.o
obj-$(CONFIG_VFIO_PLATFORM_AMDXGBE_RESET) += vfio-platform-amdxgbe.o
diff --git a/drivers/vfio/platform/reset/vfio_platform_qcomhidma.c b/drivers/vfio/platform/reset/vfio_platform_qcomhidma.c
new file mode 100644
index 0000000..70d7eed
--- /dev/null
+++ b/drivers/vfio/platform/reset/vfio_platform_qcomhidma.c
@@ -0,0 +1,99 @@
+/*
+ * Qualcomm Technologies HIDMA VFIO Reset Driver
+ *
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/iopoll.h>
+
+#include "vfio_platform_private.h"
+
+#define TRCA_CTRLSTS_OFFSET 0x000
+#define EVCA_CTRLSTS_OFFSET 0x000
+
+#define CH_CONTROL_MASK GENMASK(7, 0)
+#define CH_STATE_MASK GENMASK(7, 0)
+#define CH_STATE_BIT_POS 0x8
+
+#define HIDMA_CH_STATE(val) \
+ ((val >> CH_STATE_BIT_POS) & CH_STATE_MASK)
+
+#define EVCA_IRQ_EN_OFFSET 0x110
+
+#define CH_RESET 9
+#define CH_DISABLED 0
+
+int vfio_platform_qcomhidma_reset(struct vfio_platform_device *vdev)
+{
+ struct vfio_platform_region *trreg;
+ struct vfio_platform_region *evreg;
+ u32 val;
+ int ret;
+
+ if (vdev->num_regions != 2)
+ return -ENODEV;
+
+ trreg = &vdev->regions[0];
+ if (!trreg->ioaddr) {
+ trreg->ioaddr =
+ ioremap_nocache(trreg->addr, trreg->size);
+ if (!trreg->ioaddr)
+ return -ENOMEM;
+ }
+
+ evreg = &vdev->regions[1];
+ if (!evreg->ioaddr) {
+ evreg->ioaddr =
+ ioremap_nocache(evreg->addr, evreg->size);
+ if (!evreg->ioaddr)
+ return -ENOMEM;
+ }
+
+ /* disable IRQ */
+ writel(0, evreg->ioaddr + EVCA_IRQ_EN_OFFSET);
+
+ /* reset both transfer and event channels */
+ val = readl(trreg->ioaddr + TRCA_CTRLSTS_OFFSET);
+ val &= ~(CH_CONTROL_MASK << 16);
+ val |= CH_RESET << 16;
+ writel(val, trreg->ioaddr + TRCA_CTRLSTS_OFFSET);
+
+ ret = readl_poll_timeout(trreg->ioaddr + TRCA_CTRLSTS_OFFSET, val,
+ HIDMA_CH_STATE(val) == CH_DISABLED, 1000,
+ 10000);
+ if (ret)
+ return ret;
+
+ val = readl(evreg->ioaddr + EVCA_CTRLSTS_OFFSET);
+ val &= ~(CH_CONTROL_MASK << 16);
+ val |= CH_RESET << 16;
+ writel(val, evreg->ioaddr + EVCA_CTRLSTS_OFFSET);
+
+ ret = readl_poll_timeout(evreg->ioaddr + EVCA_CTRLSTS_OFFSET, val,
+ HIDMA_CH_STATE(val) == CH_DISABLED, 1000,
+ 10000);
+ if (ret)
+ return ret;
+
+ pr_info("HIDMA channel reset\n");
+ return 0;
+}
+module_vfio_reset_handler("qcom,hidma-1.0", "QCOM8061",
+ vfio_platform_qcomhidma_reset);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Reset support for Qualcomm Technologies HIDMA device");
--
1.8.2.1
next prev parent reply other threads:[~2016-02-05 4:35 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-05 4:34 [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver Sinan Kaya
2016-02-05 4:34 ` [PATCH V14 1/9] dma: qcom_bam_dma: move to qcom directory Sinan Kaya
2016-03-11 2:13 ` Vinod Koul
2016-02-05 4:34 ` [PATCH V14 2/9] dma: hidma: Add Device Tree binding Sinan Kaya
2016-03-11 2:16 ` Vinod Koul
2016-02-05 4:34 ` [PATCH V14 3/9] dma: add Qualcomm Technologies HIDMA management driver Sinan Kaya
2016-03-11 2:16 ` Vinod Koul
2016-02-05 4:34 ` [PATCH V14 4/9] dma: add Qualcomm Technologies HIDMA channel driver Sinan Kaya
2016-03-11 2:17 ` Vinod Koul
2016-02-05 4:34 ` [PATCH V14 5/9] dma: qcom_hidma: implement lower level hardware interface Sinan Kaya
2016-03-11 2:06 ` Vinod Koul
2016-03-11 3:08 ` Okaya
2016-03-11 16:02 ` Sinan Kaya
2016-03-11 16:32 ` Vinod Koul
2016-03-11 16:44 ` Sinan Kaya
2016-03-11 19:29 ` Sinan Kaya
2016-03-11 21:59 ` Sinan Kaya
2016-03-13 16:00 ` Vinod Koul
2016-03-14 13:53 ` Sinan Kaya
2016-03-13 15:59 ` Vinod Koul
2016-03-14 13:56 ` Sinan Kaya
2016-02-05 4:34 ` [PATCH V14 6/9] dma: qcom_hidma: add debugfs hooks Sinan Kaya
2016-02-05 4:34 ` [PATCH V14 7/9] dma: qcom_hidma: add support for object hierarchy Sinan Kaya
2016-02-05 4:34 ` [PATCH V14 8/9] vfio, platform: add support for ACPI while detecting the reset driver Sinan Kaya
2016-02-26 16:24 ` Sinan Kaya
2016-02-26 17:15 ` Eric Auger
2016-02-26 19:21 ` Sinan Kaya
2016-03-02 18:34 ` Sinan Kaya
2016-03-03 23:14 ` Eric Auger
2016-03-04 5:20 ` Sinan Kaya
2016-03-07 4:09 ` Eric Auger
2016-03-07 15:30 ` Sinan Kaya
2016-03-08 4:46 ` Eric Auger
2016-03-08 5:07 ` Sinan Kaya
2016-03-08 15:44 ` Sinan Kaya
2016-02-05 4:34 ` Sinan Kaya [this message]
2016-02-26 17:52 ` [PATCH V14 9/9] vfio, platform: add QTI HIDMA " Eric Auger
2016-02-26 19:05 ` Sinan Kaya
2016-02-08 10:14 ` [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver Christoffer Dall
2016-02-08 14:24 ` Sinan Kaya
2016-02-08 17:00 ` Christoffer Dall
2016-02-26 16:21 ` Sinan Kaya
2016-02-26 16:52 ` Timur Tabi
2016-03-02 18:40 ` Sinan Kaya
2016-03-03 3:44 ` Vinod Koul
2016-03-03 15:22 ` Sinan Kaya
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