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/*
* 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");
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