drivers/misc/xilinx_tmr_inject.c

1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for Xilinx TMR Inject IP.
8  * This driver is developed for TMR Inject IP,The Triple Modular Redundancy(TMR)
9  * Inject provides fault injection.
17 #include <linux/fault-inject.h>
19 /* TMR Inject Register offsets */
34  * struct xtmr_inject_dev - Driver data for TMR Inject
46 MODULE_PARM_DESC(inject_request, "default fault injection attributes");
53 	iowrite32(value, xtmr_inject->regs + addr);  in xtmr_inject_write()
59 	return ioread32(xtmr_inject->regs + addr);  in xtmr_inject_read()
65 		return -EINVAL;  in xtmr_inject_set()
89 	/* Allow fault injection */  in xtmr_inject_init()
90 	cr_val = xtmr_inject->magic |  in xtmr_inject_init()
95 	/* Initialize the address inject and instruction inject registers */  in xtmr_inject_init()
103  * xtmr_inject_probe - Driver probe function
116 	xtmr_inject = devm_kzalloc(&pdev->dev, sizeof(*xtmr_inject),  in xtmr_inject_probe()
119 		return -ENOMEM;  in xtmr_inject_probe()
121 	xtmr_inject->regs = devm_platform_ioremap_resource(pdev, 0);  in xtmr_inject_probe()
122 	if (IS_ERR(xtmr_inject->regs))  in xtmr_inject_probe()
123 		return PTR_ERR(xtmr_inject->regs);  in xtmr_inject_probe()
125 	err = of_property_read_u32(pdev->dev.of_node, "xlnx,magic",  in xtmr_inject_probe()
126 				   &xtmr_inject->magic);  in xtmr_inject_probe()
128 		dev_err(&pdev->dev, "unable to read xlnx,magic property");  in xtmr_inject_probe()
132 	if (xtmr_inject->magic > XTMR_INJECT_MAGIC_MAX_VAL) {  in xtmr_inject_probe()
133 		dev_err(&pdev->dev, "invalid xlnx,magic property value");  in xtmr_inject_probe()
134 		return -EINVAL;  in xtmr_inject_probe()
137 	/* Initialize TMR Inject */  in xtmr_inject_probe()
155 		.compatible = "xlnx,tmr-inject-1.0",
163 		.name = "xilinx-tmr_inject",
171 MODULE_DESCRIPTION("Xilinx TMR Inject Driver");