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author | Thor Thayer <tthayer@opensource.altera.com> | 2016-06-02 19:52:23 +0200 |
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committer | Lee Jones <lee.jones@linaro.org> | 2016-06-29 11:14:37 +0200 |
commit | 9787f5e28b50774f1d5672e33b277ba1e9aa0753 (patch) | |
tree | 8d60d0f760a4ba58ddd4762ebb1f9c918f5e7c20 /drivers/mfd/altera-a10sr.c | |
parent | MAINTAINERS: Add Altera Arria10 System Resource Chip (diff) | |
download | linux-9787f5e28b50774f1d5672e33b277ba1e9aa0753.tar.xz linux-9787f5e28b50774f1d5672e33b277ba1e9aa0753.zip |
mfd: altr_a10sr: Add Altera Arria10 DevKit System Resource Chip
Add support for the Altera Arria10 Development Kit System Resource
chip which is implemented using a MAX5 as a external gpio extender
with the regmap framework over a SPI bus.
Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/altera-a10sr.c')
-rw-r--r-- | drivers/mfd/altera-a10sr.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/mfd/altera-a10sr.c b/drivers/mfd/altera-a10sr.c new file mode 100644 index 000000000000..c05aa4ff57fd --- /dev/null +++ b/drivers/mfd/altera-a10sr.c @@ -0,0 +1,169 @@ +/* + * 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; + } +} + +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"); |