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dmaengine: xilinx: xdma: Add user logic interrupt support

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The Xilinx DMA/Bridge Subsystem for PCIe (XDMA) provides up to 16 user
interrupt wires to user logic that generate interrupts to the host.
This patch adds APIs to enable/disable user logic interrupt for a given
interrupt wire index.

Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Signed-off-by: Sonal Santan <sonal.santan@amd.com>
Signed-off-by: Max Zhen <max.zhen@amd.com>
Signed-off-by: Brian Xu <brian.xu@amd.com>
Tested-by: Martin Tuma <tumic@gpxsee.org>
Link: https://lore.kernel.org/r/1674145926-29449-3-git-send-email-lizhi.hou@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Lizhi Hou 2023-01-19 08:32:06 -08:00 committed by Vinod Koul
parent 17ce252266
commit ecf294a6f6
3 changed files with 98 additions and 0 deletions
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1
MAINTAINERS
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@ -22897,6 +22897,7 @@ L: dmaengine@vger.kernel.org
S: Supported
F: drivers/dma/xilinx/xdma-regs.h
F: drivers/dma/xilinx/xdma.c
F: include/linux/dma/amd_xdma.h
F: include/linux/platform_data/amd_xdma.h
XILINX ZYNQMP DPDMA DRIVER

81
drivers/dma/xilinx/xdma.c
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@ -25,6 +25,7 @@
#include <linux/dmapool.h>
#include <linux/regmap.h>
#include <linux/dmaengine.h>
#include <linux/dma/amd_xdma.h>
#include <linux/platform_device.h>
#include <linux/platform_data/amd_xdma.h>
#include <linux/dma-mapping.h>
@ -687,6 +688,7 @@ static int xdma_set_vector_reg(struct xdma_device *xdev, u32 vec_tbl_start,
static int xdma_irq_init(struct xdma_device *xdev)
{
u32 irq = xdev->irq_start;
u32 user_irq_start;
int i, j, ret;
/* return failure if there are not enough IRQs */
@ -729,6 +731,18 @@ static int xdma_irq_init(struct xdma_device *xdev)
goto failed_init_c2h;
}
/* config user IRQ registers if needed */
user_irq_start = XDMA_CHAN_NUM(xdev);
if (xdev->irq_num > user_irq_start) {
ret = xdma_set_vector_reg(xdev, XDMA_IRQ_USER_VEC_NUM,
user_irq_start,
xdev->irq_num - user_irq_start);
if (ret) {
xdma_err(xdev, "failed to set user vectors: %d", ret);
goto failed_init_c2h;
}
}
/* enable interrupt */
ret = regmap_write(xdev->rmap, XDMA_IRQ_CHAN_INT_EN_W1S, ~0);
if (ret)
@ -754,6 +768,73 @@ static bool xdma_filter_fn(struct dma_chan *chan, void *param)
return chan_info->dir == xdma_chan->dir;
}
/**
* xdma_disable_user_irq - Disable user interrupt
* @pdev: Pointer to the platform_device structure
* @irq_num: System IRQ number
*/
void xdma_disable_user_irq(struct platform_device *pdev, u32 irq_num)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
u32 index;
index = irq_num - xdev->irq_start;
if (index < XDMA_CHAN_NUM(xdev) || index >= xdev->irq_num) {
xdma_err(xdev, "invalid user irq number");
return;
}
index -= XDMA_CHAN_NUM(xdev);
regmap_write(xdev->rmap, XDMA_IRQ_USER_INT_EN_W1C, 1 << index);
}
EXPORT_SYMBOL(xdma_disable_user_irq);
/**
* xdma_enable_user_irq - Enable user logic interrupt
* @pdev: Pointer to the platform_device structure
* @irq_num: System IRQ number
*/
int xdma_enable_user_irq(struct platform_device *pdev, u32 irq_num)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
u32 index;
int ret;
index = irq_num - xdev->irq_start;
if (index < XDMA_CHAN_NUM(xdev) || index >= xdev->irq_num) {
xdma_err(xdev, "invalid user irq number");
return -EINVAL;
}
index -= XDMA_CHAN_NUM(xdev);
ret = regmap_write(xdev->rmap, XDMA_IRQ_USER_INT_EN_W1S, 1 << index);
if (ret)
return ret;
return 0;
}
EXPORT_SYMBOL(xdma_enable_user_irq);
/**
* xdma_get_user_irq - Get system IRQ number
* @pdev: Pointer to the platform_device structure
* @user_irq_index: User logic IRQ wire index
*
* Return: The system IRQ number allocated for the given wire index.
*/
int xdma_get_user_irq(struct platform_device *pdev, u32 user_irq_index)
{
struct xdma_device *xdev = platform_get_drvdata(pdev);
if (XDMA_CHAN_NUM(xdev) + user_irq_index >= xdev->irq_num) {
xdma_err(xdev, "invalid user irq index");
return -EINVAL;
}
return xdev->irq_start + XDMA_CHAN_NUM(xdev) + user_irq_index;
}
EXPORT_SYMBOL(xdma_get_user_irq);
/**
* xdma_remove - Driver remove function
* @pdev: Pointer to the platform_device structure

16
include/linux/dma/amd_xdma.h Normal file
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@ -0,0 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2022, Advanced Micro Devices, Inc.
*/
#ifndef _DMAENGINE_AMD_XDMA_H
#define _DMAENGINE_AMD_XDMA_H
#include <linux/interrupt.h>
#include <linux/platform_device.h>
int xdma_enable_user_irq(struct platform_device *pdev, u32 irq_num);
void xdma_disable_user_irq(struct platform_device *pdev, u32 irq_num);
int xdma_get_user_irq(struct platform_device *pdev, u32 user_irq_index);
#endif /* _DMAENGINE_AMD_XDMA_H */