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drivers/mfd/lochnagar-i2c.c
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// SPDX-License-Identifier: GPL-2.0 /* * Lochnagar I2C bus interface * * Copyright (c) 2012-2018 Cirrus Logic, Inc. and * Cirrus Logic International Semiconductor Ltd. * * Author: Charles Keepax <ckeepax@opensource.cirrus.com> */ #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/lockdep.h> #include <linux/mfd/core.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/regmap.h> #include <linux/mfd/lochnagar.h> #include <linux/mfd/lochnagar1_regs.h> #include <linux/mfd/lochnagar2_regs.h> #define LOCHNAGAR_BOOT_RETRIES 10 #define LOCHNAGAR_BOOT_DELAY_MS 350 #define LOCHNAGAR_CONFIG_POLL_US 10000 static bool lochnagar1_readable_register(struct device *dev, unsigned int reg) { switch (reg) { case LOCHNAGAR_SOFTWARE_RESET: case LOCHNAGAR_FIRMWARE_ID1...LOCHNAGAR_FIRMWARE_ID2: case LOCHNAGAR1_CDC_AIF1_SEL...LOCHNAGAR1_CDC_AIF3_SEL: case LOCHNAGAR1_CDC_MCLK1_SEL...LOCHNAGAR1_CDC_MCLK2_SEL: case LOCHNAGAR1_CDC_AIF_CTRL1...LOCHNAGAR1_CDC_AIF_CTRL2: case LOCHNAGAR1_EXT_AIF_CTRL: case LOCHNAGAR1_DSP_AIF1_SEL...LOCHNAGAR1_DSP_AIF2_SEL: case LOCHNAGAR1_DSP_CLKIN_SEL: case LOCHNAGAR1_DSP_AIF: case LOCHNAGAR1_GF_AIF1...LOCHNAGAR1_GF_AIF2: case LOCHNAGAR1_PSIA_AIF: case LOCHNAGAR1_PSIA1_SEL...LOCHNAGAR1_PSIA2_SEL: case LOCHNAGAR1_SPDIF_AIF_SEL: case LOCHNAGAR1_GF_AIF3_SEL...LOCHNAGAR1_GF_AIF4_SEL: case LOCHNAGAR1_GF_CLKOUT1_SEL: case LOCHNAGAR1_GF_AIF1_SEL...LOCHNAGAR1_GF_AIF2_SEL: case LOCHNAGAR1_GF_GPIO2...LOCHNAGAR1_GF_GPIO7: case LOCHNAGAR1_RST: case LOCHNAGAR1_LED1...LOCHNAGAR1_LED2: case LOCHNAGAR1_I2C_CTRL: return true; default: return false; } } static const struct regmap_config lochnagar1_i2c_regmap = { .reg_bits = 8, .val_bits = 8, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_BIG, .max_register = 0x50, .readable_reg = lochnagar1_readable_register, .use_single_read = true, .use_single_write = true, .cache_type = REGCACHE_RBTREE, }; static const struct reg_sequence lochnagar1_patch[] = { { 0x40, 0x0083 }, { 0x47, 0x0018 }, { 0x50, 0x0000 }, }; static bool lochnagar2_readable_register(struct device *dev, unsigned int reg) { switch (reg) { case LOCHNAGAR_SOFTWARE_RESET: case LOCHNAGAR_FIRMWARE_ID1...LOCHNAGAR_FIRMWARE_ID2: case LOCHNAGAR2_CDC_AIF1_CTRL...LOCHNAGAR2_CDC_AIF3_CTRL: case LOCHNAGAR2_DSP_AIF1_CTRL...LOCHNAGAR2_DSP_AIF2_CTRL: case LOCHNAGAR2_PSIA1_CTRL...LOCHNAGAR2_PSIA2_CTRL: case LOCHNAGAR2_GF_AIF3_CTRL...LOCHNAGAR2_GF_AIF4_CTRL: case LOCHNAGAR2_GF_AIF1_CTRL...LOCHNAGAR2_GF_AIF2_CTRL: case LOCHNAGAR2_SPDIF_AIF_CTRL: case LOCHNAGAR2_USB_AIF1_CTRL...LOCHNAGAR2_USB_AIF2_CTRL: case LOCHNAGAR2_ADAT_AIF_CTRL: case LOCHNAGAR2_CDC_MCLK1_CTRL...LOCHNAGAR2_CDC_MCLK2_CTRL: case LOCHNAGAR2_DSP_CLKIN_CTRL: case LOCHNAGAR2_PSIA1_MCLK_CTRL...LOCHNAGAR2_PSIA2_MCLK_CTRL: case LOCHNAGAR2_SPDIF_MCLK_CTRL: case LOCHNAGAR2_GF_CLKOUT1_CTRL...LOCHNAGAR2_GF_CLKOUT2_CTRL: case LOCHNAGAR2_ADAT_MCLK_CTRL: case LOCHNAGAR2_SOUNDCARD_MCLK_CTRL: case LOCHNAGAR2_GPIO_FPGA_GPIO1...LOCHNAGAR2_GPIO_FPGA_GPIO6: case LOCHNAGAR2_GPIO_CDC_GPIO1...LOCHNAGAR2_GPIO_CDC_GPIO8: case LOCHNAGAR2_GPIO_DSP_GPIO1...LOCHNAGAR2_GPIO_DSP_GPIO6: case LOCHNAGAR2_GPIO_GF_GPIO2...LOCHNAGAR2_GPIO_GF_GPIO7: case LOCHNAGAR2_GPIO_CDC_AIF1_BCLK...LOCHNAGAR2_GPIO_CDC_AIF3_TXDAT: case LOCHNAGAR2_GPIO_DSP_AIF1_BCLK...LOCHNAGAR2_GPIO_DSP_AIF2_TXDAT: case LOCHNAGAR2_GPIO_PSIA1_BCLK...LOCHNAGAR2_GPIO_PSIA2_TXDAT: case LOCHNAGAR2_GPIO_GF_AIF3_BCLK...LOCHNAGAR2_GPIO_GF_AIF4_TXDAT: case LOCHNAGAR2_GPIO_GF_AIF1_BCLK...LOCHNAGAR2_GPIO_GF_AIF2_TXDAT: case LOCHNAGAR2_GPIO_DSP_UART1_RX...LOCHNAGAR2_GPIO_DSP_UART2_TX: case LOCHNAGAR2_GPIO_GF_UART2_RX...LOCHNAGAR2_GPIO_GF_UART2_TX: case LOCHNAGAR2_GPIO_USB_UART_RX: case LOCHNAGAR2_GPIO_CDC_PDMCLK1...LOCHNAGAR2_GPIO_CDC_PDMDAT2: case LOCHNAGAR2_GPIO_CDC_DMICCLK1...LOCHNAGAR2_GPIO_CDC_DMICDAT4: case LOCHNAGAR2_GPIO_DSP_DMICCLK1...LOCHNAGAR2_GPIO_DSP_DMICDAT2: case LOCHNAGAR2_GPIO_I2C2_SCL...LOCHNAGAR2_GPIO_I2C4_SDA: case LOCHNAGAR2_GPIO_DSP_STANDBY: case LOCHNAGAR2_GPIO_CDC_MCLK1...LOCHNAGAR2_GPIO_CDC_MCLK2: case LOCHNAGAR2_GPIO_DSP_CLKIN: case LOCHNAGAR2_GPIO_PSIA1_MCLK...LOCHNAGAR2_GPIO_PSIA2_MCLK: case LOCHNAGAR2_GPIO_GF_GPIO1...LOCHNAGAR2_GPIO_GF_GPIO5: case LOCHNAGAR2_GPIO_DSP_GPIO20: case LOCHNAGAR2_GPIO_CHANNEL1...LOCHNAGAR2_GPIO_CHANNEL16: case LOCHNAGAR2_MINICARD_RESETS: case LOCHNAGAR2_ANALOGUE_PATH_CTRL1...LOCHNAGAR2_ANALOGUE_PATH_CTRL2: case LOCHNAGAR2_COMMS_CTRL4: case LOCHNAGAR2_SPDIF_CTRL: case LOCHNAGAR2_IMON_CTRL1...LOCHNAGAR2_IMON_CTRL4: case LOCHNAGAR2_IMON_DATA1...LOCHNAGAR2_IMON_DATA2: case LOCHNAGAR2_POWER_CTRL: case LOCHNAGAR2_MICVDD_CTRL1: case LOCHNAGAR2_MICVDD_CTRL2: case LOCHNAGAR2_VDDCORE_CDC_CTRL1: case LOCHNAGAR2_VDDCORE_CDC_CTRL2: case LOCHNAGAR2_SOUNDCARD_AIF_CTRL: return true; default: return false; } } static bool lochnagar2_volatile_register(struct device *dev, unsigned int reg) { switch (reg) { case LOCHNAGAR2_GPIO_CHANNEL1...LOCHNAGAR2_GPIO_CHANNEL16: case LOCHNAGAR2_ANALOGUE_PATH_CTRL1: case LOCHNAGAR2_IMON_CTRL3...LOCHNAGAR2_IMON_CTRL4: case LOCHNAGAR2_IMON_DATA1...LOCHNAGAR2_IMON_DATA2: return true; default: return false; } } static const struct regmap_config lochnagar2_i2c_regmap = { .reg_bits = 16, .val_bits = 16, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_BIG, .max_register = 0x1F1F, .readable_reg = lochnagar2_readable_register, .volatile_reg = lochnagar2_volatile_register, .cache_type = REGCACHE_RBTREE, }; static const struct reg_sequence lochnagar2_patch[] = { { 0x00EE, 0x0000 }, }; struct lochnagar_config { int id; const char * const name; enum lochnagar_type type; const struct regmap_config *regmap; const struct reg_sequence *patch; int npatch; }; static struct lochnagar_config lochnagar_configs[] = { { .id = 0x50, .name = "lochnagar1", .type = LOCHNAGAR1, .regmap = &lochnagar1_i2c_regmap, .patch = lochnagar1_patch, .npatch = ARRAY_SIZE(lochnagar1_patch), }, { .id = 0xCB58, .name = "lochnagar2", .type = LOCHNAGAR2, .regmap = &lochnagar2_i2c_regmap, .patch = lochnagar2_patch, .npatch = ARRAY_SIZE(lochnagar2_patch), }, }; static const struct of_device_id lochnagar_of_match[] = { { .compatible = "cirrus,lochnagar1", .data = &lochnagar_configs[0] }, { .compatible = "cirrus,lochnagar2", .data = &lochnagar_configs[1] }, {}, }; static int lochnagar_wait_for_boot(struct regmap *regmap, unsigned int *id) { int i, ret; for (i = 0; i < LOCHNAGAR_BOOT_RETRIES; ++i) { msleep(LOCHNAGAR_BOOT_DELAY_MS); /* The reset register will return the device ID when read */ ret = regmap_read(regmap, LOCHNAGAR_SOFTWARE_RESET, id); if (!ret) return ret; } return -ETIMEDOUT; } /** * lochnagar_update_config - Synchronise the boards analogue configuration to * the hardware. * * @lochnagar: A pointer to the primary core data structure. * * Return: Zero on success or an appropriate negative error code on failure. */ int lochnagar_update_config(struct lochnagar *lochnagar) { struct regmap *regmap = lochnagar->regmap; unsigned int done = LOCHNAGAR2_ANALOGUE_PATH_UPDATE_STS_MASK; int timeout_ms = LOCHNAGAR_BOOT_DELAY_MS * LOCHNAGAR_BOOT_RETRIES; unsigned int val = 0; int ret; lockdep_assert_held(&lochnagar->analogue_config_lock); if (lochnagar->type != LOCHNAGAR2) return 0; /* * Toggle the ANALOGUE_PATH_UPDATE bit and wait for the device to * acknowledge that any outstanding changes to the analogue * configuration have been applied. */ ret = regmap_write(regmap, LOCHNAGAR2_ANALOGUE_PATH_CTRL1, 0); if (ret < 0) return ret; ret = regmap_write(regmap, LOCHNAGAR2_ANALOGUE_PATH_CTRL1, LOCHNAGAR2_ANALOGUE_PATH_UPDATE_MASK); if (ret < 0) return ret; ret = regmap_read_poll_timeout(regmap, LOCHNAGAR2_ANALOGUE_PATH_CTRL1, val, (val & done), LOCHNAGAR_CONFIG_POLL_US, timeout_ms * 1000); if (ret < 0) return ret; return 0; } EXPORT_SYMBOL_GPL(lochnagar_update_config); static int lochnagar_i2c_probe(struct i2c_client *i2c) { struct device *dev = &i2c->dev; const struct lochnagar_config *config = NULL; const struct of_device_id *of_id; struct lochnagar *lochnagar; struct gpio_desc *reset, *present; unsigned int val; unsigned int firmwareid; unsigned int devid, rev; int ret; lochnagar = devm_kzalloc(dev, sizeof(*lochnagar), GFP_KERNEL); if (!lochnagar) return -ENOMEM; of_id = of_match_device(lochnagar_of_match, dev); if (!of_id) return -EINVAL; config = of_id->data; lochnagar->dev = dev; mutex_init(&lochnagar->analogue_config_lock); dev_set_drvdata(dev, lochnagar); reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(reset)) { ret = PTR_ERR(reset); dev_err(dev, "Failed to get reset GPIO: %d ", ret); return ret; } present = devm_gpiod_get_optional(dev, "present", GPIOD_OUT_HIGH); if (IS_ERR(present)) { ret = PTR_ERR(present); dev_err(dev, "Failed to get present GPIO: %d ", ret); return ret; } /* Leave the Lochnagar in reset for a reasonable amount of time */ msleep(20); /* Bring Lochnagar out of reset */ gpiod_set_value_cansleep(reset, 1); /* Identify Lochnagar */ lochnagar->type = config->type; lochnagar->regmap = devm_regmap_init_i2c(i2c, config->regmap); if (IS_ERR(lochnagar->regmap)) { ret = PTR_ERR(lochnagar->regmap); dev_err(dev, "Failed to allocate register map: %d ", ret); return ret; } /* Wait for Lochnagar to boot */ ret = lochnagar_wait_for_boot(lochnagar->regmap, &val); if (ret < 0) { dev_err(dev, "Failed to read device ID: %d ", ret); return ret; } devid = val & LOCHNAGAR_DEVICE_ID_MASK; rev = val & LOCHNAGAR_REV_ID_MASK; if (devid != config->id) { dev_err(dev, "ID does not match %s (expected 0x%x got 0x%x) ", config->name, config->id, devid); return -ENODEV; } /* Identify firmware */ ret = regmap_read(lochnagar->regmap, LOCHNAGAR_FIRMWARE_ID1, &val); if (ret < 0) { dev_err(dev, "Failed to read firmware id 1: %d ", ret); return ret; } firmwareid = val; ret = regmap_read(lochnagar->regmap, LOCHNAGAR_FIRMWARE_ID2, &val); if (ret < 0) { dev_err(dev, "Failed to read firmware id 2: %d ", ret); return ret; } firmwareid |= (val << config->regmap->val_bits); dev_info(dev, "Found %s (0x%x) revision %u firmware 0x%.6x ", config->name, devid, rev + 1, firmwareid); ret = regmap_register_patch(lochnagar->regmap, config->patch, config->npatch); if (ret < 0) { dev_err(dev, "Failed to register patch: %d ", ret); return ret; } ret = devm_of_platform_populate(dev); if (ret < 0) { dev_err(dev, "Failed to populate child nodes: %d ", ret); return ret; } return ret; } static struct i2c_driver lochnagar_i2c_driver = { .driver = { .name = "lochnagar", .of_match_table = of_match_ptr(lochnagar_of_match), .suppress_bind_attrs = true, }, .probe_new = lochnagar_i2c_probe, }; static int __init lochnagar_i2c_init(void) { int ret; ret = i2c_add_driver(&lochnagar_i2c_driver); if (ret) pr_err("Failed to register Lochnagar driver: %d ", ret); return ret; } subsys_initcall(lochnagar_i2c_init); |