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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Xilinx TMR Inject IP.
*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*
* Description:
* This driver is developed for TMR Inject IP,The Triple Modular Redundancy(TMR)
* Inject provides fault injection.
*/
#include <asm/xilinx_mb_manager.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/debugfs.h>
#include <linux/platform_device.h>
#include <linux/fault-inject.h>
/* TMR Inject Register offsets */
#define XTMR_INJECT_CR_OFFSET 0x0
#define XTMR_INJECT_AIR_OFFSET 0x4
#define XTMR_INJECT_IIR_OFFSET 0xC
#define XTMR_INJECT_EAIR_OFFSET 0x10
#define XTMR_INJECT_ERR_OFFSET 0x204
/* Register Bitmasks/shifts */
#define XTMR_INJECT_CR_CPUID_SHIFT 8
#define XTMR_INJECT_CR_IE_SHIFT 10
#define XTMR_INJECT_IIR_ADDR_MASK GENMASK(31, 16)
#define XTMR_INJECT_MAGIC_MAX_VAL 255
/**
* struct xtmr_inject_dev - Driver data for TMR Inject
* @regs: device physical base address
* @magic: Magic hardware configuration value
*/
struct xtmr_inject_dev {
void __iomem *regs;
u32 magic;
};
static DECLARE_FAULT_ATTR(inject_fault);
static char *inject_request;
module_param(inject_request, charp, 0);
MODULE_PARM_DESC(inject_request, "default fault injection attributes");
static struct dentry *dbgfs_root;
/* IO accessors */
static inline void xtmr_inject_write(struct xtmr_inject_dev *xtmr_inject,
u32 addr, u32 value)
{
iowrite32(value, xtmr_inject->regs + addr);
}
static inline u32 xtmr_inject_read(struct xtmr_inject_dev *xtmr_inject,
u32 addr)
{
return ioread32(xtmr_inject->regs + addr);
}
static int xtmr_inject_set(void *data, u64 val)
{
if (val != 1)
return -EINVAL;
xmb_inject_err();
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(xtmr_inject_fops, NULL, xtmr_inject_set, "%llu\n");
static void xtmr_init_debugfs(struct xtmr_inject_dev *xtmr_inject)
{
struct dentry *dir;
dbgfs_root = debugfs_create_dir("xtmr_inject", NULL);
dir = fault_create_debugfs_attr("inject_fault", dbgfs_root,
&inject_fault);
debugfs_create_file("inject_fault", 0200, dir, NULL,
&xtmr_inject_fops);
}
static void xtmr_inject_init(struct xtmr_inject_dev *xtmr_inject)
{
u32 cr_val;
if (inject_request)
setup_fault_attr(&inject_fault, inject_request);
/* Allow fault injection */
cr_val = xtmr_inject->magic |
(1 << XTMR_INJECT_CR_IE_SHIFT) |
(1 << XTMR_INJECT_CR_CPUID_SHIFT);
xtmr_inject_write(xtmr_inject, XTMR_INJECT_CR_OFFSET,
cr_val);
/* Initialize the address inject and instruction inject registers */
xtmr_inject_write(xtmr_inject, XTMR_INJECT_AIR_OFFSET,
XMB_INJECT_ERR_OFFSET);
xtmr_inject_write(xtmr_inject, XTMR_INJECT_IIR_OFFSET,
XMB_INJECT_ERR_OFFSET & XTMR_INJECT_IIR_ADDR_MASK);
}
/**
* xtmr_inject_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*
* This is the driver probe routine. It does all the memory
* allocation for the device.
*
* Return: 0 on success and failure value on error
*/
static int xtmr_inject_probe(struct platform_device *pdev)
{
struct xtmr_inject_dev *xtmr_inject;
int err;
xtmr_inject = devm_kzalloc(&pdev->dev, sizeof(*xtmr_inject),
GFP_KERNEL);
if (!xtmr_inject)
return -ENOMEM;
xtmr_inject->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(xtmr_inject->regs))
return PTR_ERR(xtmr_inject->regs);
err = of_property_read_u32(pdev->dev.of_node, "xlnx,magic",
&xtmr_inject->magic);
if (err < 0) {
dev_err(&pdev->dev, "unable to read xlnx,magic property");
return err;
}
if (xtmr_inject->magic > XTMR_INJECT_MAGIC_MAX_VAL) {
dev_err(&pdev->dev, "invalid xlnx,magic property value");
return -EINVAL;
}
/* Initialize TMR Inject */
xtmr_inject_init(xtmr_inject);
xtmr_init_debugfs(xtmr_inject);
platform_set_drvdata(pdev, xtmr_inject);
return 0;
}
static void xtmr_inject_remove(struct platform_device *pdev)
{
debugfs_remove_recursive(dbgfs_root);
dbgfs_root = NULL;
}
static const struct of_device_id xtmr_inject_of_match[] = {
{
.compatible = "xlnx,tmr-inject-1.0",
},
{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, xtmr_inject_of_match);
static struct platform_driver xtmr_inject_driver = {
.driver = {
.name = "xilinx-tmr_inject",
.of_match_table = xtmr_inject_of_match,
},
.probe = xtmr_inject_probe,
.remove_new = xtmr_inject_remove,
};
module_platform_driver(xtmr_inject_driver);
MODULE_AUTHOR("Advanced Micro Devices, Inc");
MODULE_DESCRIPTION("Xilinx TMR Inject Driver");
MODULE_LICENSE("GPL");
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