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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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