// SPDX-License-Identifier: GPL-2.0/* *  Copyright (C) 2018-2019, Intel Corporation. *  Copyright (C) 2012 Freescale Semiconductor, Inc. *  Copyright (C) 2012 Linaro Ltd. * *  Based on syscon driver. */ #include <linux/arm-smccc.h>#include <linux/err.h>#include <linux/io.h>#include <linux/mfd/altera-sysmgr.h>#include <linux/mfd/syscon.h>#include <linux/module.h>#include <linux/of.h>#include <linux/platform_device.h>#include <linux/regmap.h>#include <linux/slab.h> /** * struct altr_sysmgr - Altera SOCFPGA System Manager * @regmap: the regmap used for System Manager accesses. */struct altr_sysmgr {	struct regmap   *regmap;}; static struct platform_driver altr_sysmgr_driver; /** * s10_protected_reg_write * Write to a protected SMC register. * @base: Base address of System Manager * @reg:  Address offset of register * @val:  Value to write * Return: INTEL_SIP_SMC_STATUS_OK (0) on success *	   INTEL_SIP_SMC_REG_ERROR on error *	   INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported */static int s10_protected_reg_write(void *base,				   unsigned int reg, unsigned int val){	struct arm_smccc_res result;	unsigned long sysmgr_base = (unsigned long)base; 	arm_smccc_smc(INTEL_SIP_SMC_REG_WRITE, sysmgr_base + reg,		      val, 0, 0, 0, 0, 0, &result); 	return (int)result.a0;} /** * s10_protected_reg_read * Read the status of a protected SMC register * @base: Base address of System Manager. * @reg:  Address of register * @val:  Value read. * Return: INTEL_SIP_SMC_STATUS_OK (0) on success *	   INTEL_SIP_SMC_REG_ERROR on error *	   INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported */static int s10_protected_reg_read(void *base,				  unsigned int reg, unsigned int *val){	struct arm_smccc_res result;	unsigned long sysmgr_base = (unsigned long)base; 	arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sysmgr_base + reg,		      0, 0, 0, 0, 0, 0, &result); 	*val = (unsigned int)result.a1; 	return (int)result.a0;} static struct regmap_config altr_sysmgr_regmap_cfg = {	.name = "altr_sysmgr",	.reg_bits = 32,	.reg_stride = 4,	.val_bits = 32,	.fast_io = true,	.use_single_read = true,	.use_single_write = true,}; /** * altr_sysmgr_regmap_lookup_by_phandle * Find the sysmgr previous configured in probe() and return regmap property. * Return: regmap if found or error if not found. * * @np: Pointer to device's Device Tree node * @property: Device Tree property name which references the sysmgr */struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np,						    const char *property){	struct device *dev;	struct altr_sysmgr *sysmgr;	struct device_node *sysmgr_np; 	if (property)		sysmgr_np = of_parse_phandle(np, property, 0);	else		sysmgr_np = np; 	if (!sysmgr_np)		return ERR_PTR(-ENODEV); 	dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver,					    (void *)sysmgr_np);	if (property)		of_node_put(sysmgr_np); 	if (!dev)		return ERR_PTR(-EPROBE_DEFER); 	sysmgr = dev_get_drvdata(dev); 	put_device(dev); 	return sysmgr->regmap;}EXPORT_SYMBOL_GPL(altr_sysmgr_regmap_lookup_by_phandle); static int sysmgr_probe(struct platform_device *pdev){	struct altr_sysmgr *sysmgr;	struct regmap *regmap;	struct resource *res;	struct regmap_config sysmgr_config = altr_sysmgr_regmap_cfg;	struct device *dev = &pdev->dev;	struct device_node *np = dev->of_node;	void __iomem *base; 	sysmgr = devm_kzalloc(dev, sizeof(*sysmgr), GFP_KERNEL);	if (!sysmgr)		return -ENOMEM; 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);	if (!res)		return -ENOENT; 	sysmgr_config.max_register = resource_size(res) -				     sysmgr_config.reg_stride;	if (of_device_is_compatible(np, "altr,sys-mgr-s10")) {		sysmgr_config.reg_read = s10_protected_reg_read;		sysmgr_config.reg_write = s10_protected_reg_write; 		/* Need physical address for SMCC call */		regmap = devm_regmap_init(dev, NULL,					  (void *)(uintptr_t)res->start,					  &sysmgr_config);	} else {		base = devm_ioremap(dev, res->start, resource_size(res));		if (!base)			return -ENOMEM; 		sysmgr_config.max_register = resource_size(res) - 4;		regmap = devm_regmap_init_mmio(dev, base, &sysmgr_config);	} 	if (IS_ERR(regmap)) {		pr_err("regmap init failed\n");		return PTR_ERR(regmap);	} 	sysmgr->regmap = regmap; 	platform_set_drvdata(pdev, sysmgr); 	return 0;} static const struct of_device_id altr_sysmgr_of_match[] = {	{ .compatible = "altr,sys-mgr" },	{ .compatible = "altr,sys-mgr-s10" },	{},};MODULE_DEVICE_TABLE(of, altr_sysmgr_of_match); static struct platform_driver altr_sysmgr_driver = {	.probe =  sysmgr_probe,	.driver = {		.name = "altr,system_manager",		.of_match_table = altr_sysmgr_of_match,	},}; static int __init altr_sysmgr_init(void){	return platform_driver_register(&altr_sysmgr_driver);}core_initcall(altr_sysmgr_init); static void __exit altr_sysmgr_exit(void){	platform_driver_unregister(&altr_sysmgr_driver);}module_exit(altr_sysmgr_exit); MODULE_AUTHOR("Thor Thayer <>");MODULE_DESCRIPTION("SOCFPGA System Manager driver");