[linux-2.6-block.git] / drivers / mfd / altera-sysmgr.c

// 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/of_address.h>
#include <linux/of_platform.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);
	of_node_put(sysmgr_np);
	if (!dev)
		return ERR_PTR(-EPROBE_DEFER);

	sysmgr = dev_get_drvdata(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 *)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) - 3;
		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");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
f36e789a TT	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (C) 2018-2019, Intel Corporation.
	4	* Copyright (C) 2012 Freescale Semiconductor, Inc.
	5	* Copyright (C) 2012 Linaro Ltd.
	6	*
	7	* Based on syscon driver.
	8	*/
	9
	10	#include <linux/arm-smccc.h>
	11	#include <linux/err.h>
	12	#include <linux/io.h>
	13	#include <linux/mfd/altera-sysmgr.h>
	14	#include <linux/mfd/syscon.h>
	15	#include <linux/module.h>
	16	#include <linux/of.h>
	17	#include <linux/of_address.h>
	18	#include <linux/of_platform.h>
	19	#include <linux/regmap.h>
	20	#include <linux/slab.h>
	21
	22	/**
	23	* struct altr_sysmgr - Altera SOCFPGA System Manager
	24	* @regmap: the regmap used for System Manager accesses.
f36e789a TT	25	*/
	26	struct altr_sysmgr {
	27	struct regmap *regmap;
f36e789a TT	28	};
	29
	30	static struct platform_driver altr_sysmgr_driver;
	31
	32	/**
	33	* s10_protected_reg_write
	34	* Write to a protected SMC register.
	35	* @base: Base address of System Manager
	36	* @reg: Address offset of register
	37	* @val: Value to write
	38	* Return: INTEL_SIP_SMC_STATUS_OK (0) on success
	39	* INTEL_SIP_SMC_REG_ERROR on error
	40	* INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported
	41	*/
	42	static int s10_protected_reg_write(void *base,
	43	unsigned int reg, unsigned int val)
	44	{
	45	struct arm_smccc_res result;
	46	unsigned long sysmgr_base = (unsigned long)base;
	47
	48	arm_smccc_smc(INTEL_SIP_SMC_REG_WRITE, sysmgr_base + reg,
	49	val, 0, 0, 0, 0, 0, &result);
	50
	51	return (int)result.a0;
	52	}
	53
	54	/**
	55	* s10_protected_reg_read
	56	* Read the status of a protected SMC register
	57	* @base: Base address of System Manager.
	58	* @reg: Address of register
	59	* @val: Value read.
	60	* Return: INTEL_SIP_SMC_STATUS_OK (0) on success
	61	* INTEL_SIP_SMC_REG_ERROR on error
	62	* INTEL_SIP_SMC_RETURN_UNKNOWN_FUNCTION if not supported
	63	*/
	64	static int s10_protected_reg_read(void *base,
	65	unsigned int reg, unsigned int *val)
	66	{
	67	struct arm_smccc_res result;
	68	unsigned long sysmgr_base = (unsigned long)base;
	69
	70	arm_smccc_smc(INTEL_SIP_SMC_REG_READ, sysmgr_base + reg,
	71	0, 0, 0, 0, 0, 0, &result);
	72
	73	*val = (unsigned int)result.a1;
	74
	75	return (int)result.a0;
	76	}
	77
	78	static struct regmap_config altr_sysmgr_regmap_cfg = {
	79	.name = "altr_sysmgr",
	80	.reg_bits = 32,
	81	.reg_stride = 4,
	82	.val_bits = 32,
	83	.fast_io = true,
	84	.use_single_read = true,
	85	.use_single_write = true,
	86	};
	87
f36e789a TT	88	/**
	89	* altr_sysmgr_regmap_lookup_by_phandle
	90	* Find the sysmgr previous configured in probe() and return regmap property.
	91	* Return: regmap if found or error if not found.
0824c889 LJ	92	*
	93	* @np: Pointer to device's Device Tree node
	94	* @property: Device Tree property name which references the sysmgr
f36e789a TT	95	*/
	96	struct regmap altr_sysmgr_regmap_lookup_by_phandle(struct device_node np,
	97	const char *property)
	98	{
	99	struct device *dev;
	100	struct altr_sysmgr *sysmgr;
	101	struct device_node *sysmgr_np;
	102
	103	if (property)
	104	sysmgr_np = of_parse_phandle(np, property, 0);
	105	else
	106	sysmgr_np = np;
	107
	108	if (!sysmgr_np)
	109	return ERR_PTR(-ENODEV);
	110
cfba5de9 SP	111	dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver,
cfba5de9 SP	112	(void *)sysmgr_np);
f36e789a TT	113	of_node_put(sysmgr_np);
	114	if (!dev)
	115	return ERR_PTR(-EPROBE_DEFER);
	116
	117	sysmgr = dev_get_drvdata(dev);
	118
	119	return sysmgr->regmap;
	120	}
	121	EXPORT_SYMBOL_GPL(altr_sysmgr_regmap_lookup_by_phandle);
	122
	123	static int sysmgr_probe(struct platform_device *pdev)
	124	{
	125	struct altr_sysmgr *sysmgr;
	126	struct regmap *regmap;
	127	struct resource *res;
	128	struct regmap_config sysmgr_config = altr_sysmgr_regmap_cfg;
	129	struct device *dev = &pdev->dev;
	130	struct device_node *np = dev->of_node;
d9ca7801	131	void __iomem *base;
f36e789a TT	132
	133	sysmgr = devm_kzalloc(dev, sizeof(*sysmgr), GFP_KERNEL);
	134	if (!sysmgr)
	135	return -ENOMEM;
	136
	137	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	138	if (!res)
	139	return -ENOENT;
	140
	141	sysmgr_config.max_register = resource_size(res) -
	142	sysmgr_config.reg_stride;
	143	if (of_device_is_compatible(np, "altr,sys-mgr-s10")) {
f36e789a TT	144	sysmgr_config.reg_read = s10_protected_reg_read;
	145	sysmgr_config.reg_write = s10_protected_reg_write;
	146
d9ca7801 LJ	147	/* Need physical address for SMCC call */
d9ca7801 LJ	148	regmap = devm_regmap_init(dev, NULL, (void *)res->start,
f36e789a TT	149	&sysmgr_config);
f36e789a TT	150	} else {
d9ca7801 LJ	151	base = devm_ioremap(dev, res->start, resource_size(res));
d9ca7801 LJ	152	if (!base)
f36e789a TT	153	return -ENOMEM;
f36e789a TT	154
d12edf96	155	sysmgr_config.max_register = resource_size(res) - 3;
d9ca7801	156	regmap = devm_regmap_init_mmio(dev, base, &sysmgr_config);
f36e789a TT	157	}
	158
	159	if (IS_ERR(regmap)) {
	160	pr_err("regmap init failed\n");
	161	return PTR_ERR(regmap);
	162	}
	163
	164	sysmgr->regmap = regmap;
	165
	166	platform_set_drvdata(pdev, sysmgr);
	167
	168	return 0;
	169	}
	170
	171	static const struct of_device_id altr_sysmgr_of_match[] = {
	172	{ .compatible = "altr,sys-mgr" },
	173	{ .compatible = "altr,sys-mgr-s10" },
	174	{},
	175	};
	176	MODULE_DEVICE_TABLE(of, altr_sysmgr_of_match);
	177
	178	static struct platform_driver altr_sysmgr_driver = {
	179	.probe = sysmgr_probe,
	180	.driver = {
	181	.name = "altr,system_manager",
	182	.of_match_table = altr_sysmgr_of_match,
	183	},
	184	};
	185
	186	static int __init altr_sysmgr_init(void)
	187	{
	188	return platform_driver_register(&altr_sysmgr_driver);
	189	}
	190	core_initcall(altr_sysmgr_init);
	191
	192	static void __exit altr_sysmgr_exit(void)
	193	{
	194	platform_driver_unregister(&altr_sysmgr_driver);
	195	}
	196	module_exit(altr_sysmgr_exit);
	197
	198	MODULE_AUTHOR("Thor Thayer <>");
	199	MODULE_DESCRIPTION("SOCFPGA System Manager driver");
	200	MODULE_LICENSE("GPL v2");