drivers/misc/xilinx_tmr_inject.c

Source file repositories/reference/linux-study-clean/drivers/misc/xilinx_tmr_inject.c

File Facts

System
Linux kernel
Corpus path
drivers/misc/xilinx_tmr_inject.c
Extension
.c
Size
4493 bytes
Lines
173
Domain
Driver Families
Bucket
drivers/misc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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) {

Annotation

Implementation Notes