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    Subject[PATCH v13 04/13] mfd: Add Ingenic TCU driver
    Date
    This driver will provide a regmap that can be retrieved very early in
    the boot process through the API function ingenic_tcu_get_regmap().

    Additionally, it will call devm_of_platform_populate() so that all the
    children devices will be probed.

    Signed-off-by: Paul Cercueil <paul@crapouillou.net>
    Tested-by: Mathieu Malaterre <malat@debian.org>
    Tested-by: Artur Rojek <contact@artur-rojek.eu>
    ---

    Notes:
    v12: New patch

    v13: No change

    drivers/mfd/Kconfig | 8 +++
    drivers/mfd/Makefile | 1 +
    drivers/mfd/ingenic-tcu.c | 113 ++++++++++++++++++++++++++++++++
    include/linux/mfd/ingenic-tcu.h | 8 +++
    4 files changed, 130 insertions(+)
    create mode 100644 drivers/mfd/ingenic-tcu.c

    diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
    index a17d275bf1d4..f3ed22613cbc 100644
    --- a/drivers/mfd/Kconfig
    +++ b/drivers/mfd/Kconfig
    @@ -495,6 +495,14 @@ config HTC_I2CPLD
    This device provides input and output GPIOs through an I2C
    interface to one or more sub-chips.

    +config INGENIC_TCU
    + bool "Ingenic Timer/Counter Unit (TCU) support"
    + depends on MIPS || COMPILE_TEST
    + select REGMAP_MMIO
    + help
    + Say yes here to support the Timer/Counter Unit (TCU) IP present
    + in the JZ47xx SoCs from Ingenic.
    +
    config MFD_INTEL_QUARK_I2C_GPIO
    tristate "Intel Quark MFD I2C GPIO"
    depends on PCI
    diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
    index 52b1a90ff515..fb89e131ae98 100644
    --- a/drivers/mfd/Makefile
    +++ b/drivers/mfd/Makefile
    @@ -180,6 +180,7 @@ obj-$(CONFIG_AB8500_CORE) += ab8500-core.o ab8500-sysctrl.o
    obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
    obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
    obj-$(CONFIG_MFD_KEMPLD) += kempld-core.o
    +obj-$(CONFIG_INGENIC_TCU) += ingenic-tcu.o
    obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) += intel_quark_i2c_gpio.o
    obj-$(CONFIG_LPC_SCH) += lpc_sch.o
    obj-$(CONFIG_LPC_ICH) += lpc_ich.o
    diff --git a/drivers/mfd/ingenic-tcu.c b/drivers/mfd/ingenic-tcu.c
    new file mode 100644
    index 000000000000..6c1d5e4310c1
    --- /dev/null
    +++ b/drivers/mfd/ingenic-tcu.c
    @@ -0,0 +1,113 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * JZ47xx SoCs TCU MFD driver
    + * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
    + */
    +
    +#include <linux/mfd/ingenic-tcu.h>
    +#include <linux/of_address.h>
    +#include <linux/of_platform.h>
    +#include <linux/platform_device.h>
    +#include <linux/regmap.h>
    +
    +struct ingenic_soc_info {
    + unsigned int num_channels;
    +};
    +
    +static struct regmap *tcu_regmap __initdata;
    +
    +static const struct regmap_config ingenic_tcu_regmap_config = {
    + .reg_bits = 32,
    + .val_bits = 32,
    + .reg_stride = 4,
    + .max_register = TCU_REG_OST_CNTHBUF,
    +};
    +
    +static const struct ingenic_soc_info jz4740_soc_info = {
    + .num_channels = 8,
    +};
    +
    +static const struct ingenic_soc_info jz4725b_soc_info = {
    + .num_channels = 6,
    +};
    +
    +static const struct of_device_id ingenic_tcu_of_match[] = {
    + { .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, },
    + { .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
    + { .compatible = "ingenic,jz4770-tcu", .data = &jz4740_soc_info, },
    + { }
    +};
    +
    +static struct regmap * __init ingenic_tcu_create_regmap(struct device_node *np)
    +{
    + struct resource res;
    + void __iomem *base;
    + struct regmap *map;
    +
    + if (!of_match_node(ingenic_tcu_of_match, np))
    + return ERR_PTR(-EINVAL);
    +
    + base = of_io_request_and_map(np, 0, "TCU");
    + if (IS_ERR(base))
    + return ERR_PTR(PTR_ERR(base));
    +
    + map = regmap_init_mmio(NULL, base, &ingenic_tcu_regmap_config);
    + if (IS_ERR(map))
    + goto err_iounmap;
    +
    + return map;
    +
    +err_iounmap:
    + iounmap(base);
    + of_address_to_resource(np, 0, &res);
    + release_mem_region(res.start, resource_size(&res));
    +
    + return map;
    +}
    +
    +static int __init ingenic_tcu_probe(struct platform_device *pdev)
    +{
    + struct regmap *map = ingenic_tcu_get_regmap(pdev->dev.of_node);
    +
    + platform_set_drvdata(pdev, map);
    +
    + regmap_attach_dev(&pdev->dev, map, &ingenic_tcu_regmap_config);
    +
    + return devm_of_platform_populate(&pdev->dev);
    +}
    +
    +static struct platform_driver ingenic_tcu_driver = {
    + .driver = {
    + .name = "ingenic-tcu",
    + .of_match_table = ingenic_tcu_of_match,
    + },
    +};
    +
    +static int __init ingenic_tcu_platform_init(void)
    +{
    + return platform_driver_probe(&ingenic_tcu_driver,
    + ingenic_tcu_probe);
    +}
    +subsys_initcall(ingenic_tcu_platform_init);
    +
    +struct regmap * __init ingenic_tcu_get_regmap(struct device_node *np)
    +{
    + if (!tcu_regmap)
    + tcu_regmap = ingenic_tcu_create_regmap(np);
    +
    + return tcu_regmap;
    +}
    +
    +bool ingenic_tcu_pwm_can_use_chn(struct device *dev, unsigned int channel)
    +{
    + const struct ingenic_soc_info *soc = device_get_match_data(dev->parent);
    +
    + /* Enable all TCU channels for PWM use by default except channels 0/1 */
    + u32 pwm_channels_mask = GENMASK(soc->num_channels - 1, 2);
    +
    + device_property_read_u32(dev->parent, "ingenic,pwm-channels-mask",
    + &pwm_channels_mask);
    +
    + return !!(pwm_channels_mask & BIT(channel));
    +}
    +EXPORT_SYMBOL_GPL(ingenic_tcu_pwm_can_use_chn);
    diff --git a/include/linux/mfd/ingenic-tcu.h b/include/linux/mfd/ingenic-tcu.h
    index 2083fa20821d..21df23916cd2 100644
    --- a/include/linux/mfd/ingenic-tcu.h
    +++ b/include/linux/mfd/ingenic-tcu.h
    @@ -6,6 +6,11 @@
    #define __LINUX_MFD_INGENIC_TCU_H_

    #include <linux/bitops.h>
    +#include <linux/init.h>
    +
    +struct device;
    +struct device_node;
    +struct regmap;

    #define TCU_REG_WDT_TDR 0x00
    #define TCU_REG_WDT_TCER 0x04
    @@ -53,4 +58,7 @@
    #define TCU_REG_TCNTc(c) (TCU_REG_TCNT0 + ((c) * TCU_CHANNEL_STRIDE))
    #define TCU_REG_TCSRc(c) (TCU_REG_TCSR0 + ((c) * TCU_CHANNEL_STRIDE))

    +struct regmap * __init ingenic_tcu_get_regmap(struct device_node *np);
    +bool ingenic_tcu_pwm_can_use_chn(struct device *dev, unsigned int channel);
    +
    #endif /* __LINUX_MFD_INGENIC_TCU_H_ */
    --
    2.21.0.593.g511ec345e18
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