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161 lines
3.6 KiB
161 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Altera Arria10 DevKit System Resource MFD Driver |
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* |
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* Author: Thor Thayer <[email protected]> |
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* |
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* Copyright Intel Corporation (C) 2014-2016. All Rights Reserved |
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* |
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* SPI access for Altera Arria10 MAX5 System Resource Chip |
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* |
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* Adapted from DA9052 |
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*/ |
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#include <linux/mfd/altera-a10sr.h> |
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#include <linux/mfd/core.h> |
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#include <linux/init.h> |
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#include <linux/of.h> |
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#include <linux/spi/spi.h> |
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static const struct mfd_cell altr_a10sr_subdev_info[] = { |
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{ |
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.name = "altr_a10sr_gpio", |
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.of_compatible = "altr,a10sr-gpio", |
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}, |
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{ |
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.name = "altr_a10sr_reset", |
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.of_compatible = "altr,a10sr-reset", |
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}, |
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}; |
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static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case ALTR_A10SR_VERSION_READ: |
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case ALTR_A10SR_LED_REG: |
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case ALTR_A10SR_PBDSW_REG: |
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case ALTR_A10SR_PBDSW_IRQ_REG: |
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case ALTR_A10SR_PWR_GOOD1_REG: |
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case ALTR_A10SR_PWR_GOOD2_REG: |
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case ALTR_A10SR_PWR_GOOD3_REG: |
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case ALTR_A10SR_FMCAB_REG: |
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case ALTR_A10SR_HPS_RST_REG: |
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case ALTR_A10SR_USB_QSPI_REG: |
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case ALTR_A10SR_SFPA_REG: |
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case ALTR_A10SR_SFPB_REG: |
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case ALTR_A10SR_I2C_M_REG: |
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case ALTR_A10SR_WARM_RST_REG: |
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case ALTR_A10SR_WR_KEY_REG: |
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case ALTR_A10SR_PMBUS_REG: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case ALTR_A10SR_LED_REG: |
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case ALTR_A10SR_PBDSW_IRQ_REG: |
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case ALTR_A10SR_FMCAB_REG: |
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case ALTR_A10SR_HPS_RST_REG: |
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case ALTR_A10SR_USB_QSPI_REG: |
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case ALTR_A10SR_SFPA_REG: |
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case ALTR_A10SR_SFPB_REG: |
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case ALTR_A10SR_WARM_RST_REG: |
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case ALTR_A10SR_WR_KEY_REG: |
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case ALTR_A10SR_PMBUS_REG: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg) |
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{ |
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switch (reg) { |
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case ALTR_A10SR_PBDSW_REG: |
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case ALTR_A10SR_PBDSW_IRQ_REG: |
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case ALTR_A10SR_PWR_GOOD1_REG: |
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case ALTR_A10SR_PWR_GOOD2_REG: |
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case ALTR_A10SR_PWR_GOOD3_REG: |
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case ALTR_A10SR_HPS_RST_REG: |
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case ALTR_A10SR_I2C_M_REG: |
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case ALTR_A10SR_WARM_RST_REG: |
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case ALTR_A10SR_WR_KEY_REG: |
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case ALTR_A10SR_PMBUS_REG: |
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return true; |
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default: |
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return false; |
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} |
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} |
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static const struct regmap_config altr_a10sr_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.cache_type = REGCACHE_NONE, |
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.use_single_read = true, |
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.use_single_write = true, |
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.read_flag_mask = 1, |
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.write_flag_mask = 0, |
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.max_register = ALTR_A10SR_WR_KEY_REG, |
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.readable_reg = altr_a10sr_reg_readable, |
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.writeable_reg = altr_a10sr_reg_writeable, |
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.volatile_reg = altr_a10sr_reg_volatile, |
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}; |
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static int altr_a10sr_spi_probe(struct spi_device *spi) |
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{ |
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int ret; |
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struct altr_a10sr *a10sr; |
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a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr), |
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GFP_KERNEL); |
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if (!a10sr) |
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return -ENOMEM; |
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spi->mode = SPI_MODE_3; |
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spi->bits_per_word = 8; |
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spi_setup(spi); |
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a10sr->dev = &spi->dev; |
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spi_set_drvdata(spi, a10sr); |
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a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config); |
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if (IS_ERR(a10sr->regmap)) { |
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ret = PTR_ERR(a10sr->regmap); |
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dev_err(&spi->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO, |
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altr_a10sr_subdev_info, |
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ARRAY_SIZE(altr_a10sr_subdev_info), |
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NULL, 0, NULL); |
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if (ret) |
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dev_err(a10sr->dev, "Failed to register sub-devices: %d\n", |
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ret); |
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return ret; |
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} |
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static const struct of_device_id altr_a10sr_spi_of_match[] = { |
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{ .compatible = "altr,a10sr" }, |
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{ }, |
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}; |
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static struct spi_driver altr_a10sr_spi_driver = { |
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.probe = altr_a10sr_spi_probe, |
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.driver = { |
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.name = "altr_a10sr", |
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.of_match_table = of_match_ptr(altr_a10sr_spi_of_match), |
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}, |
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}; |
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builtin_driver(altr_a10sr_spi_driver, spi_register_driver)
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