[PATCH v4 3/3] mfd: pm8008: Add driver for QCOM PM8008 PMIC

From: Guru Das Srinagesh
Date: Mon May 10 2021 - 20:27:23 EST

Qualcomm Technologies, Inc. PM8008 is a dedicated camera PMIC that
integrates all the necessary power management, housekeeping, and
interface support functions into a single IC. Its key features include
overtemperature protection, low-dropout linear regulators, GPIOs, and an
I2C interface.

Add an MFD driver to support it.

Signed-off-by: Guru Das Srinagesh <gurus@xxxxxxxxxxxxxx>
---
drivers/mfd/Kconfig | 14 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/qcom-pm8008.c | 260 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 275 insertions(+)
create mode 100644 drivers/mfd/qcom-pm8008.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b74efa4..c3bb49a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2087,6 +2087,20 @@ config MFD_ACER_A500_EC
The controller itself is ENE KB930, it is running firmware
customized for the specific needs of the Acer A500 hardware.

+config MFD_QCOM_PM8008
+ tristate "QCOM PM8008 Power Management IC"
+ depends on I2C && OF
+ select REGMAP_I2C
+ select REGMAP_IRQ
+ help
+ Select this option to get support for the Qualcomm Technologies, Inc.
+ PM8008 PMIC chip. PM8008 is a dedicated camera PMIC that integrates
+ all the necessary power management, housekeeping, and interface
+ support functions into a single IC. This driver provides common
+ support for accessing the device by instantiating all the child nodes
+ under it in the device tree. Additional drivers must be enabled in
+ order to use the functionality of the device.
+
menu "Multimedia Capabilities Port drivers"
depends on ARCH_SA1100

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 834f546..a5dda823 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -264,6 +264,7 @@ obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
obj-$(CONFIG_MFD_STMFX) += stmfx.o
obj-$(CONFIG_MFD_KHADAS_MCU) += khadas-mcu.o
obj-$(CONFIG_MFD_ACER_A500_EC) += acer-ec-a500.o
+obj-$(CONFIG_MFD_QCOM_PM8008) += qcom-pm8008.o

obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o
obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o
diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
new file mode 100644
index 0000000..c472d7f
--- /dev/null
+++ b/drivers/mfd/qcom-pm8008.c
@@ -0,0 +1,260 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitops.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/mfd/qcom-pm8008.h>
+
+#define I2C_INTR_STATUS_BASE 0x0550
+#define INT_RT_STS_OFFSET 0x10
+#define INT_SET_TYPE_OFFSET 0x11
+#define INT_POL_HIGH_OFFSET 0x12
+#define INT_POL_LOW_OFFSET 0x13
+#define INT_LATCHED_CLR_OFFSET 0x14
+#define INT_EN_SET_OFFSET 0x15
+#define INT_EN_CLR_OFFSET 0x16
+#define INT_LATCHED_STS_OFFSET 0x18
+
+enum {
+ PM8008_MISC,
+ PM8008_TEMP_ALARM,
+ PM8008_GPIO1,
+ PM8008_GPIO2,
+ PM8008_NUM_PERIPHS,
+};
+
+#define PM8008_PERIPH_0_BASE 0x900
+#define PM8008_PERIPH_1_BASE 0x2400
+#define PM8008_PERIPH_2_BASE 0xC000
+#define PM8008_PERIPH_3_BASE 0xC100
+
+#define PM8008_TEMP_ALARM_ADDR PM8008_PERIPH_1_BASE
+#define PM8008_GPIO1_ADDR PM8008_PERIPH_2_BASE
+#define PM8008_GPIO2_ADDR PM8008_PERIPH_3_BASE
+
+#define PM8008_STATUS_BASE (PM8008_PERIPH_0_BASE | INT_LATCHED_STS_OFFSET)
+#define PM8008_MASK_BASE (PM8008_PERIPH_0_BASE | INT_EN_SET_OFFSET)
+#define PM8008_UNMASK_BASE (PM8008_PERIPH_0_BASE | INT_EN_CLR_OFFSET)
+#define PM8008_TYPE_BASE (PM8008_PERIPH_0_BASE | INT_SET_TYPE_OFFSET)
+#define PM8008_ACK_BASE (PM8008_PERIPH_0_BASE | INT_LATCHED_CLR_OFFSET)
+#define PM8008_POLARITY_HI_BASE (PM8008_PERIPH_0_BASE | INT_POL_HIGH_OFFSET)
+#define PM8008_POLARITY_LO_BASE (PM8008_PERIPH_0_BASE | INT_POL_LOW_OFFSET)
+
+#define PM8008_PERIPH_OFFSET(paddr) (paddr - PM8008_PERIPH_0_BASE)
+
+struct pm8008_data {
+ struct device *dev;
+ struct regmap *regmap;
+ int irq;
+ struct regmap_irq_chip_data *irq_data;
+};
+
+static unsigned int p0_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_0_BASE)};
+static unsigned int p1_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_1_BASE)};
+static unsigned int p2_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_2_BASE)};
+static unsigned int p3_offs[] = {PM8008_PERIPH_OFFSET(PM8008_PERIPH_3_BASE)};
+
+static struct regmap_irq_sub_irq_map pm8008_sub_reg_offsets[] = {
+ REGMAP_IRQ_MAIN_REG_OFFSET(p0_offs),
+ REGMAP_IRQ_MAIN_REG_OFFSET(p1_offs),
+ REGMAP_IRQ_MAIN_REG_OFFSET(p2_offs),
+ REGMAP_IRQ_MAIN_REG_OFFSET(p3_offs),
+};
+
+static unsigned int pm8008_virt_regs[] = {
+ PM8008_POLARITY_HI_BASE,
+ PM8008_POLARITY_LO_BASE,
+};
+
+enum {
+ POLARITY_HI_INDEX,
+ POLARITY_LO_INDEX,
+ PM8008_NUM_VIRT_REGS,
+};
+
+static struct regmap_irq pm8008_irqs[] = {
+ REGMAP_IRQ_REG(PM8008_IRQ_MISC_UVLO, PM8008_MISC, BIT(0)),
+ REGMAP_IRQ_REG(PM8008_IRQ_MISC_OVLO, PM8008_MISC, BIT(1)),
+ REGMAP_IRQ_REG(PM8008_IRQ_MISC_OTST2, PM8008_MISC, BIT(2)),
+ REGMAP_IRQ_REG(PM8008_IRQ_MISC_OTST3, PM8008_MISC, BIT(3)),
+ REGMAP_IRQ_REG(PM8008_IRQ_MISC_LDO_OCP, PM8008_MISC, BIT(4)),
+ REGMAP_IRQ_REG(PM8008_IRQ_TEMP_ALARM, PM8008_TEMP_ALARM, BIT(0)),
+ REGMAP_IRQ_REG(PM8008_IRQ_GPIO1, PM8008_GPIO1, BIT(0)),
+ REGMAP_IRQ_REG(PM8008_IRQ_GPIO2, PM8008_GPIO2, BIT(0)),
+};
+
+static int pm8008_set_type_virt(unsigned int **virt_buf,
+ unsigned int type, unsigned long hwirq,
+ int reg)
+{
+ switch (type) {
+ case IRQ_TYPE_EDGE_FALLING:
+ case IRQ_TYPE_LEVEL_LOW:
+ virt_buf[POLARITY_HI_INDEX][reg] &= ~pm8008_irqs[hwirq].mask;
+ virt_buf[POLARITY_LO_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+ break;
+
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_LEVEL_HIGH:
+ virt_buf[POLARITY_HI_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+ virt_buf[POLARITY_LO_INDEX][reg] &= ~pm8008_irqs[hwirq].mask;
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ virt_buf[POLARITY_HI_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+ virt_buf[POLARITY_LO_INDEX][reg] |= pm8008_irqs[hwirq].mask;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct regmap_irq_chip pm8008_irq_chip = {
+ .name = "pm8008_irq",
+ .main_status = I2C_INTR_STATUS_BASE,
+ .num_main_regs = 1,
+ .num_virt_regs = PM8008_NUM_VIRT_REGS,
+ .irqs = pm8008_irqs,
+ .num_irqs = ARRAY_SIZE(pm8008_irqs),
+ .num_regs = PM8008_NUM_PERIPHS,
+ .not_fixed_stride = true,
+ .sub_reg_offsets = pm8008_sub_reg_offsets,
+ .set_type_virt = pm8008_set_type_virt,
+ .status_base = PM8008_STATUS_BASE,
+ .mask_base = PM8008_MASK_BASE,
+ .unmask_base = PM8008_UNMASK_BASE,
+ .type_base = PM8008_TYPE_BASE,
+ .ack_base = PM8008_ACK_BASE,
+ .virt_reg_base = pm8008_virt_regs,
+ .num_type_reg = PM8008_NUM_PERIPHS,
+};
+
+static struct regmap_config qcom_mfd_regmap_cfg = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .max_register = 0xFFFF,
+};
+
+static int pm8008_init(struct pm8008_data *chip)
+{
+ int rc;
+
+ /*
+ * Set TEMP_ALARM peripheral's TYPE so that the regmap-irq framework
+ * reads this as the default value instead of zero, the HW default.
+ * This is required to enable the writing of TYPE registers in
+ * regmap_irq_sync_unlock().
+ */
+ rc = regmap_write(chip->regmap,
+ (PM8008_TEMP_ALARM_ADDR | INT_SET_TYPE_OFFSET),
+ BIT(0));
+ if (rc)
+ return rc;
+
+ /* Do the same for GPIO1 and GPIO2 peripherals */
+ rc = regmap_write(chip->regmap,
+ (PM8008_GPIO1_ADDR | INT_SET_TYPE_OFFSET), BIT(0));
+ if (rc)
+ return rc;
+
+ rc = regmap_write(chip->regmap,
+ (PM8008_GPIO2_ADDR | INT_SET_TYPE_OFFSET), BIT(0));
+
+ return rc;
+}
+
+static int pm8008_probe_irq_peripherals(struct pm8008_data *chip,
+ int client_irq)
+{
+ int rc, i;
+ struct regmap_irq_type *type;
+ struct regmap_irq_chip_data *irq_data;
+
+ rc = pm8008_init(chip);
+ if (rc) {
+ dev_err(chip->dev, "Init failed: %d\n", rc);
+ return rc;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(pm8008_irqs); i++) {
+ type = &pm8008_irqs[i].type;
+
+ type->type_reg_offset = pm8008_irqs[i].reg_offset;
+ type->type_rising_val = pm8008_irqs[i].mask;
+ type->type_falling_val = pm8008_irqs[i].mask;
+ type->type_level_high_val = 0;
+ type->type_level_low_val = 0;
+
+ if (type->type_reg_offset == PM8008_MISC)
+ type->types_supported = IRQ_TYPE_EDGE_RISING;
+ else
+ type->types_supported = (IRQ_TYPE_EDGE_BOTH |
+ IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW);
+ }
+
+ rc = devm_regmap_add_irq_chip(chip->dev, chip->regmap, client_irq,
+ IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
+ if (rc) {
+ dev_err(chip->dev, "Failed to add IRQ chip: %d\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static int pm8008_probe(struct i2c_client *client)
+{
+ int rc;
+ struct pm8008_data *chip;
+
+ chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = &client->dev;
+ chip->regmap = devm_regmap_init_i2c(client, &qcom_mfd_regmap_cfg);
+ if (!chip->regmap)
+ return -ENODEV;
+
+ i2c_set_clientdata(client, chip);
+
+ if (of_property_read_bool(chip->dev->of_node, "interrupt-controller")) {
+ rc = pm8008_probe_irq_peripherals(chip, client->irq);
+ if (rc)
+ dev_err(chip->dev, "Failed to probe irq periphs: %d\n", rc);
+ }
+
+ return devm_of_platform_populate(chip->dev);
+}
+
+static const struct of_device_id pm8008_match[] = {
+ { .compatible = "qcom,pm8008", },
+ { },
+};
+
+static struct i2c_driver pm8008_mfd_driver = {
+ .driver = {
+ .name = "pm8008",
+ .of_match_table = pm8008_match,
+ },
+ .probe_new = pm8008_probe,
+};
+module_i2c_driver(pm8008_mfd_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("i2c:qcom-pm8008");
--
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