[deliverable/linux.git] / drivers / mfd / altera-a10sr.c

/*
 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * SPI access for Altera Arria10 MAX5 System Resource Chip
 *
 * Adapted from DA9052
 */

#include <linux/mfd/altera-a10sr.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/spi/spi.h>

static const struct mfd_cell altr_a10sr_subdev_info[] = {
	{
		.name = "altr_a10sr_gpio",
		.of_compatible = "altr,a10sr-gpio",
	},
};

static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ALTR_A10SR_VERSION_READ:
	case ALTR_A10SR_LED_REG:
	case ALTR_A10SR_PBDSW_REG:
	case ALTR_A10SR_PBDSW_IRQ_REG:
	case ALTR_A10SR_PWR_GOOD1_REG:
	case ALTR_A10SR_PWR_GOOD2_REG:
	case ALTR_A10SR_PWR_GOOD3_REG:
	case ALTR_A10SR_FMCAB_REG:
	case ALTR_A10SR_HPS_RST_REG:
	case ALTR_A10SR_USB_QSPI_REG:
	case ALTR_A10SR_SFPA_REG:
	case ALTR_A10SR_SFPB_REG:
	case ALTR_A10SR_I2C_M_REG:
	case ALTR_A10SR_WARM_RST_REG:
	case ALTR_A10SR_WR_KEY_REG:
	case ALTR_A10SR_PMBUS_REG:
		return true;
	default:
		return false;
	}
}

static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ALTR_A10SR_LED_REG:
	case ALTR_A10SR_PBDSW_IRQ_REG:
	case ALTR_A10SR_FMCAB_REG:
	case ALTR_A10SR_HPS_RST_REG:
	case ALTR_A10SR_USB_QSPI_REG:
	case ALTR_A10SR_SFPA_REG:
	case ALTR_A10SR_SFPB_REG:
	case ALTR_A10SR_WARM_RST_REG:
	case ALTR_A10SR_WR_KEY_REG:
	case ALTR_A10SR_PMBUS_REG:
		return true;
	default:
		return false;
	}
}

static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ALTR_A10SR_PBDSW_REG:
	case ALTR_A10SR_PBDSW_IRQ_REG:
	case ALTR_A10SR_PWR_GOOD1_REG:
	case ALTR_A10SR_PWR_GOOD2_REG:
	case ALTR_A10SR_PWR_GOOD3_REG:
	case ALTR_A10SR_HPS_RST_REG:
	case ALTR_A10SR_I2C_M_REG:
	case ALTR_A10SR_WARM_RST_REG:
	case ALTR_A10SR_WR_KEY_REG:
	case ALTR_A10SR_PMBUS_REG:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config altr_a10sr_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.cache_type = REGCACHE_NONE,

	.use_single_rw = true,
	.read_flag_mask = 1,
	.write_flag_mask = 0,

	.max_register = ALTR_A10SR_WR_KEY_REG,
	.readable_reg = altr_a10sr_reg_readable,
	.writeable_reg = altr_a10sr_reg_writeable,
	.volatile_reg = altr_a10sr_reg_volatile,

};

static int altr_a10sr_spi_probe(struct spi_device *spi)
{
	int ret;
	struct altr_a10sr *a10sr;

	a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
			     GFP_KERNEL);
	if (!a10sr)
		return -ENOMEM;

	spi->mode = SPI_MODE_3;
	spi->bits_per_word = 8;
	spi_setup(spi);

	a10sr->dev = &spi->dev;

	spi_set_drvdata(spi, a10sr);

	a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
	if (IS_ERR(a10sr->regmap)) {
		ret = PTR_ERR(a10sr->regmap);
		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
				   altr_a10sr_subdev_info,
				   ARRAY_SIZE(altr_a10sr_subdev_info),
				   NULL, 0, NULL);
	if (ret)
		dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
			ret);

	return ret;
}

static const struct of_device_id altr_a10sr_spi_of_match[] = {
	{ .compatible = "altr,a10sr" },
	{ },
};
MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);

static struct spi_driver altr_a10sr_spi_driver = {
	.probe = altr_a10sr_spi_probe,
	.driver = {
		.name = "altr_a10sr",
		.of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
	},
};

module_spi_driver(altr_a10sr_spi_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
MODULE_DESCRIPTION("Altera Arria10 DevKit System Resource MFD Driver");
Commit	Line	Data
9787f5e2 TT	1	/*
	2	* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program. If not, see <http://www.gnu.org/licenses/>.
	15	*
	16	* SPI access for Altera Arria10 MAX5 System Resource Chip
	17	*
	18	* Adapted from DA9052
	19	*/
	20
	21	#include <linux/mfd/altera-a10sr.h>
	22	#include <linux/mfd/core.h>
	23	#include <linux/module.h>
	24	#include <linux/of.h>
	25	#include <linux/spi/spi.h>
	26
	27	static const struct mfd_cell altr_a10sr_subdev_info[] = {
	28	{
	29	.name = "altr_a10sr_gpio",
	30	.of_compatible = "altr,a10sr-gpio",
	31	},
	32	};
	33
	34	static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
	35	{
	36	switch (reg) {
	37	case ALTR_A10SR_VERSION_READ:
	38	case ALTR_A10SR_LED_REG:
	39	case ALTR_A10SR_PBDSW_REG:
	40	case ALTR_A10SR_PBDSW_IRQ_REG:
	41	case ALTR_A10SR_PWR_GOOD1_REG:
	42	case ALTR_A10SR_PWR_GOOD2_REG:
	43	case ALTR_A10SR_PWR_GOOD3_REG:
	44	case ALTR_A10SR_FMCAB_REG:
	45	case ALTR_A10SR_HPS_RST_REG:
	46	case ALTR_A10SR_USB_QSPI_REG:
	47	case ALTR_A10SR_SFPA_REG:
	48	case ALTR_A10SR_SFPB_REG:
	49	case ALTR_A10SR_I2C_M_REG:
	50	case ALTR_A10SR_WARM_RST_REG:
	51	case ALTR_A10SR_WR_KEY_REG:
	52	case ALTR_A10SR_PMBUS_REG:
	53	return true;
	54	default:
	55	return false;
	56	}
	57	}
	58
	59	static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
	60	{
	61	switch (reg) {
	62	case ALTR_A10SR_LED_REG:
	63	case ALTR_A10SR_PBDSW_IRQ_REG:
	64	case ALTR_A10SR_FMCAB_REG:
65	case ALTR_A10SR_HPS_RST_REG:
66	case ALTR_A10SR_USB_QSPI_REG:
67	case ALTR_A10SR_SFPA_REG:
68	case ALTR_A10SR_SFPB_REG:
69	case ALTR_A10SR_WARM_RST_REG:
70	case ALTR_A10SR_WR_KEY_REG:
71	case ALTR_A10SR_PMBUS_REG:
72	return true;
73	default:
74	return false;
75	}
76	}
77
78	static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
79	{
80	switch (reg) {
81	case ALTR_A10SR_PBDSW_REG:
82	case ALTR_A10SR_PBDSW_IRQ_REG:
83	case ALTR_A10SR_PWR_GOOD1_REG:
84	case ALTR_A10SR_PWR_GOOD2_REG:
85	case ALTR_A10SR_PWR_GOOD3_REG:
86	case ALTR_A10SR_HPS_RST_REG:
87	case ALTR_A10SR_I2C_M_REG:
88	case ALTR_A10SR_WARM_RST_REG:
89	case ALTR_A10SR_WR_KEY_REG:
90	case ALTR_A10SR_PMBUS_REG:
91	return true;
92	default:
93	return false;
94	}
95	}
96
3619b7da	97	static const struct regmap_config altr_a10sr_regmap_config = {
9787f5e2 TT	98	.reg_bits = 8,
	99	.val_bits = 8,
	100
	101	.cache_type = REGCACHE_NONE,
	102
	103	.use_single_rw = true,
	104	.read_flag_mask = 1,
	105	.write_flag_mask = 0,
	106
	107	.max_register = ALTR_A10SR_WR_KEY_REG,
	108	.readable_reg = altr_a10sr_reg_readable,
	109	.writeable_reg = altr_a10sr_reg_writeable,
	110	.volatile_reg = altr_a10sr_reg_volatile,
	111
	112	};
	113
	114	static int altr_a10sr_spi_probe(struct spi_device *spi)
	115	{
	116	int ret;
	117	struct altr_a10sr *a10sr;
	118
	119	a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
	120	GFP_KERNEL);
	121	if (!a10sr)
	122	return -ENOMEM;
	123
	124	spi->mode = SPI_MODE_3;
	125	spi->bits_per_word = 8;
	126	spi_setup(spi);
	127
	128	a10sr->dev = &spi->dev;
	129
	130	spi_set_drvdata(spi, a10sr);
	131
	132	a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
	133	if (IS_ERR(a10sr->regmap)) {
	134	ret = PTR_ERR(a10sr->regmap);
	135	dev_err(&spi->dev, "Failed to allocate register map: %d\n",
	136	ret);
	137	return ret;
	138	}
	139
	140	ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
	141	altr_a10sr_subdev_info,
	142	ARRAY_SIZE(altr_a10sr_subdev_info),
	143	NULL, 0, NULL);
	144	if (ret)
	145	dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
	146	ret);
	147
	148	return ret;
	149	}
	150
	151	static const struct of_device_id altr_a10sr_spi_of_match[] = {
	152	{ .compatible = "altr,a10sr" },
	153	{ },
	154	};
	155	MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);
	156
	157	static struct spi_driver altr_a10sr_spi_driver = {
	158	.probe = altr_a10sr_spi_probe,
	159	.driver = {
	160	.name = "altr_a10sr",
	161	.of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
162	},
163	};
164
165	module_spi_driver(altr_a10sr_spi_driver);
166
167	MODULE_LICENSE("GPL v2");
168	MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>");
169	MODULE_DESCRIPTION("Altera Arria10 DevKit System Resource MFD Driver");