diff --git a/MAINTAINERS b/MAINTAINERS index 1b1dd57cc419..8a48f6a1e593 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -29510,6 +29510,7 @@ M: James Hilliard L: linux-sunxi@lists.linux.dev S: Maintained F: Documentation/devicetree/bindings/mfd/x-powers,ac200.yaml +F: drivers/mfd/ac200.c F: include/dt-bindings/mfd/x-powers,ac200.h X-POWERS AXP288 PMIC DRIVERS diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 857ca3bb0d5b..5193c6f71bd8 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -205,6 +205,21 @@ config MFD_AC100 This driver include only the core APIs. You have to select individual components like codecs or RTC under the corresponding menus. +config MFD_AC200 + tristate "X-Powers AC200" + depends on COMMON_CLK + depends on I2C + depends on OF + select MFD_CORE + select REGMAP_I2C + select REGMAP_IRQ + help + Support for the X-Powers AC200 mixed-signal companion IC. The AC200 + contains audio, video, RTC and Fast Ethernet PHY functions and is + co-packaged with some Allwinner H6 and H616 SoCs. This driver provides + the shared register access and instantiates the individual function + devices. + config MFD_AXP20X tristate select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 72d3944b0ad8..f8101d2a9ce9 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -150,6 +150,7 @@ obj-$(CONFIG_MFD_DA9052_SPI) += da9052-spi.o obj-$(CONFIG_MFD_DA9052_I2C) += da9052-i2c.o obj-$(CONFIG_MFD_AC100) += ac100.o +obj-$(CONFIG_MFD_AC200) += ac200.o obj-$(CONFIG_MFD_AXP20X) += axp20x.o obj-$(CONFIG_MFD_AXP20X_I2C) += axp20x-i2c.o obj-$(CONFIG_MFD_AXP20X_RSB) += axp20x-rsb.o diff --git a/drivers/mfd/ac200.c b/drivers/mfd/ac200.c new file mode 100644 index 000000000000..30828e113c11 --- /dev/null +++ b/drivers/mfd/ac200.c @@ -0,0 +1,255 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core driver for the X-Powers AC200 + * + * Copyright (C) 2019 Jernej Skrabec + * Copyright (C) 2026 James Hilliard + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define AC200_SYS_CONTROL_REG 0x0002 +#define AC200_SYS_CONTROL_CHIP_RESET_DEASSERT BIT(0) +#define AC200_SYS_IRQ_ENABLE_REG 0x0004 +#define AC200_SYS_IRQ_INTB_ENABLE BIT(15) +#define AC200_SYS_IRQ_INTB_ACTIVE_HIGH BIT(14) +#define AC200_SYS_IRQ_RTC BIT(12) +#define AC200_SYS_IRQ_EPHY BIT(8) +#define AC200_SYS_IRQ_TVE BIT(4) +#define AC200_SYS_IRQ_STATUS_REG 0x0006 + +/* Interface register accessible from every register page. */ +#define AC200_TWI_REG_ADDR_H 0x00fe +#define AC200_MAX_REG 0xa1f2 + +static const struct regmap_range_cfg ac200_range_cfg[] = { + { + .range_max = AC200_MAX_REG, + .selector_reg = AC200_TWI_REG_ADDR_H, + .selector_mask = 0xff, + .window_len = 256, + }, +}; + +/* + * Each AC200 sub-block can reset independently, invalidating its register + * contents without regmap's knowledge. Cache only the common page selector; + * this avoids a selector read-modify-write for every access on the same page + * without ever returning stale functional-register values. + */ +static bool ac200_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg != AC200_TWI_REG_ADDR_H; +} + +static const struct regmap_config ac200_regmap_config = { + .name = "ac200", + .reg_bits = 8, + .reg_stride = 2, + .val_bits = 16, + .ranges = ac200_range_cfg, + .num_ranges = ARRAY_SIZE(ac200_range_cfg), + .max_register = AC200_MAX_REG, + .volatile_reg = ac200_volatile_reg, + .cache_type = REGCACHE_MAPLE, +}; + +static const struct regmap_irq ac200_irqs[] = { + REGMAP_IRQ_REG(AC200_IRQ_TVE, 0, AC200_SYS_IRQ_TVE), + REGMAP_IRQ_REG(AC200_IRQ_EPHY, 0, AC200_SYS_IRQ_EPHY), + REGMAP_IRQ_REG(AC200_IRQ_RTC, 0, AC200_SYS_IRQ_RTC), +}; + +/* + * SYS_IRQ_ENABLE is an enable register rather than a mask register, hence + * unmask_base. SYS_IRQ_STATUS reflects the source levels, so the function + * which raised an interrupt is responsible for clearing it. + */ +static const struct regmap_irq_chip ac200_irq_chip = { + .name = "ac200", + .status_base = AC200_SYS_IRQ_STATUS_REG, + .unmask_base = AC200_SYS_IRQ_ENABLE_REG, + .num_regs = 1, + .irqs = ac200_irqs, + .num_irqs = ARRAY_SIZE(ac200_irqs), +}; + +static const struct mfd_cell ac200_cells[] = { + { + .name = "ac200-codec", + .of_compatible = "x-powers,ac200-codec", + }, { + .name = "ac200-tve", + .of_compatible = "x-powers,ac200-tve", + }, +}; + +static void ac200_disable_intb(void *data) +{ + struct regmap *regmap = data; + int ret; + + ret = regmap_clear_bits(regmap, AC200_SYS_IRQ_ENABLE_REG, + AC200_SYS_IRQ_INTB_ENABLE); + if (ret) + dev_err(regmap_get_device(regmap), "failed to disable INTB: %d\n", + ret); +} + +static int ac200_init_irq(struct device *dev, struct regmap *regmap, int irq) +{ + struct regmap_irq_chip_data *irq_data; + unsigned int trigger; + u16 value = 0; + int ret; + + trigger = irq_get_trigger_type(irq); + if (trigger == IRQ_TYPE_NONE) + trigger = IRQ_TYPE_LEVEL_LOW; + + switch (trigger) { + case IRQ_TYPE_LEVEL_HIGH: + value |= AC200_SYS_IRQ_INTB_ACTIVE_HIGH; + break; + case IRQ_TYPE_LEVEL_LOW: + break; + default: + return dev_err_probe(dev, -EINVAL, + "INTB is level triggered, not type %u\n", + trigger); + } + + /* Keep INTB disabled until the sources are masked and the IRQ is ready. */ + ret = regmap_update_bits(regmap, AC200_SYS_IRQ_ENABLE_REG, + AC200_SYS_IRQ_INTB_ENABLE | + AC200_SYS_IRQ_INTB_ACTIVE_HIGH, value); + if (ret) + return ret; + + ret = devm_regmap_add_irq_chip(dev, regmap, irq, trigger | IRQF_ONESHOT, 0, + &ac200_irq_chip, &irq_data); + if (ret) + return dev_err_probe(dev, ret, "failed to add IRQ chip\n"); + + /* Disable INTB before the IRQ chip and regmap are released. */ + ret = devm_add_action_or_reset(dev, ac200_disable_intb, regmap); + if (ret) + return ret; + + return regmap_set_bits(regmap, AC200_SYS_IRQ_ENABLE_REG, + AC200_SYS_IRQ_INTB_ENABLE); +} + +static int ac200_add_devices(struct device *dev) +{ + struct mfd_cell cells[ARRAY_SIZE(ac200_cells)]; + unsigned int num_cells = 0; + unsigned int i; + int ret; + + for (i = 0; i < ARRAY_SIZE(ac200_cells); i++) { + const struct mfd_cell *cell = &ac200_cells[i]; + struct device_node *child; + + child = of_get_compatible_child(dev->of_node, + cell->of_compatible); + if (!child) + continue; + if (of_device_is_available(child)) + cells[num_cells++] = *cell; + of_node_put(child); + } + + if (!num_cells) + return 0; + + ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, num_cells, + NULL, 0, NULL); + if (ret) + return dev_err_probe(dev, ret, + "failed to add function devices\n"); + + return 0; +} + +static int ac200_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct regmap *regmap; + struct clk *clk; + int ret; + + clk = devm_clk_get_enabled(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), + "failed to enable input clock\n"); + + ret = devm_clk_rate_exclusive_get(dev, clk); + if (ret) + return dev_err_probe(dev, ret, "failed to lock clock rate\n"); + + /* + * No minimum delay is documented. Retain the BSP resume path's 40 ms wait + * after enabling the input clock and before register access. + */ + msleep(40); + + regmap = devm_regmap_init_i2c(client, &ac200_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "failed to initialize regmap\n"); + + ret = regmap_set_bits(regmap, AC200_SYS_CONTROL_REG, + AC200_SYS_CONTROL_CHIP_RESET_DEASSERT); + if (ret) + return ret; + + if (client->irq > 0) { + ret = ac200_init_irq(dev, regmap, client->irq); + if (ret) + return ret; + } + + /* AC200 and its children do not perform DMA. */ + dev->coherent_dma_mask = 0; + dev->dma_mask = &dev->coherent_dma_mask; + + return ac200_add_devices(dev); +} + +static const struct of_device_id ac200_of_match[] = { + { .compatible = "x-powers,ac200" }, + { } +}; +MODULE_DEVICE_TABLE(of, ac200_of_match); + +static const struct i2c_device_id ac200_i2c_ids[] = { + { .name = "ac200" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ac200_i2c_ids); + +static struct i2c_driver ac200_driver = { + .driver = { + .name = "ac200", + .of_match_table = ac200_of_match, + }, + .probe = ac200_probe, + .id_table = ac200_i2c_ids, +}; +module_i2c_driver(ac200_driver); + +MODULE_AUTHOR("Jernej Skrabec "); +MODULE_AUTHOR("James Hilliard "); +MODULE_DESCRIPTION("X-Powers AC200 MFD core driver"); +MODULE_LICENSE("GPL");