Message-ID: <20191115093321.GL32742@smile.fi.intel.com>
Date:   Fri, 15 Nov 2019 11:33:21 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Rahul Tanwar <rahul.tanwar@...ux.intel.com>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh@...nel.org, qi-ming.wu@...el.com,
        yixin.zhu@...ux.intel.com, cheol.yong.kim@...el.com
Subject: Re: [PATCH v7 1/2] pinctrl: Add pinmux & GPIO controller driver for
 a new SoC

On Thu, Nov 14, 2019 at 02:29:06PM +0800, Rahul Tanwar wrote:
> Intel Lightning Mountain SoC has a pinmux controller & GPIO controller IP which
> controls pin multiplexing & configuration including GPIO functions selection &
> GPIO attributes configuration.
> 
> This IP is not based on & does not have anything in common with Chassis
> specification. The pinctrl drivers under pinctrl/intel/* are all based upon
> Chassis spec compliant pinctrl IPs. So this driver doesn't fit & can not use
> pinctrl framework under pinctrl/intel/* and it requires a separate new driver.
> 
> Add a new GPIO & pin control framework based driver for this IP.

Linus, I have no means to test this nor time to read any (internally?)
available datasheet. At least my concerns against code were satisfied, except
I'm not sure about locking model. If you consider it is okay, I'm fine with
this version, although I believe there may be improvements made in the future.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>

> 
> Signed-off-by: Rahul Tanwar <rahul.tanwar@...ux.intel.com>
> ---
>  drivers/pinctrl/Kconfig               |  18 +
>  drivers/pinctrl/Makefile              |   1 +
>  drivers/pinctrl/pinctrl-equilibrium.c | 944 ++++++++++++++++++++++++++++++++++
>  drivers/pinctrl/pinctrl-equilibrium.h | 144 ++++++
>  4 files changed, 1107 insertions(+)
>  create mode 100644 drivers/pinctrl/pinctrl-equilibrium.c
>  create mode 100644 drivers/pinctrl/pinctrl-equilibrium.h
> 
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index b372419d61f2..7809e33c7762 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -420,4 +420,22 @@ config PINCTRL_TB10X
>  	depends on OF && ARC_PLAT_TB10X
>  	select GPIOLIB
>  
> +config PINCTRL_EQUILIBRIUM
> +	tristate "Generic pinctrl and GPIO driver for Intel Lightning Mountain SoC"
> +	select PINMUX
> +	select PINCONF
> +	select GPIOLIB
> +	select GPIO_GENERIC
> +	select GPIOLIB_IRQCHIP
> +	select GENERIC_PINCONF
> +	select GENERIC_PINCTRL_GROUPS
> +	select GENERIC_PINMUX_FUNCTIONS
> +
> +	help
> +	  Equilibrium pinctrl driver is a pinctrl & GPIO driver for Intel Lightning
> +	  Mountain network processor SoC that supports both the linux GPIO and pin
> +	  control frameworks. It provides interfaces to setup pinmux, assign desired
> +	  pin functions, configure GPIO attributes for LGM SoC pins. Pinmux and
> +	  pinconf settings are retrieved from device tree.
> +
>  endif
> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> index ac537fdbc998..879f312bfb75 100644
> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile
> @@ -46,6 +46,7 @@ obj-$(CONFIG_PINCTRL_ZYNQ)	+= pinctrl-zynq.o
>  obj-$(CONFIG_PINCTRL_INGENIC)	+= pinctrl-ingenic.o
>  obj-$(CONFIG_PINCTRL_RK805)	+= pinctrl-rk805.o
>  obj-$(CONFIG_PINCTRL_OCELOT)	+= pinctrl-ocelot.o
> +obj-$(CONFIG_PINCTRL_EQUILIBRIUM)   += pinctrl-equilibrium.o
>  
>  obj-y				+= actions/
>  obj-$(CONFIG_ARCH_ASPEED)	+= aspeed/
> diff --git a/drivers/pinctrl/pinctrl-equilibrium.c b/drivers/pinctrl/pinctrl-equilibrium.c
> new file mode 100644
> index 000000000000..db497fbc669a
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-equilibrium.c
> @@ -0,0 +1,944 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (C) 2019 Intel Corporation */
> +
> +#include <linux/gpio/driver.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/platform_device.h>
> +
> +#include "core.h"
> +#include "pinconf.h"
> +#include "pinmux.h"
> +#include "pinctrl-equilibrium.h"
> +
> +#define PIN_NAME_FMT	"io-%d"
> +#define PIN_NAME_LEN	10
> +#define PAD_REG_OFF	0x100
> +
> +static void eqbr_gpio_disable_irq(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc);
> +	unsigned int offset = irqd_to_hwirq(d);
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(&gctrl->lock, flags);
> +	writel(BIT(offset), gctrl->membase + GPIO_IRNENCLR);
> +	raw_spin_unlock_irqrestore(&gctrl->lock, flags);
> +}
> +
> +static void eqbr_gpio_enable_irq(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc);
> +	unsigned int offset = irqd_to_hwirq(d);
> +	unsigned long flags;
> +
> +	gc->direction_input(gc, offset);
> +	raw_spin_lock_irqsave(&gctrl->lock, flags);
> +	writel(BIT(offset), gctrl->membase + GPIO_IRNRNSET);
> +	raw_spin_unlock_irqrestore(&gctrl->lock, flags);
> +}
> +
> +static void eqbr_gpio_ack_irq(struct irq_data *d)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc);
> +	unsigned int offset = irqd_to_hwirq(d);
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(&gctrl->lock, flags);
> +	writel(BIT(offset), gctrl->membase + GPIO_IRNCR);
> +	raw_spin_unlock_irqrestore(&gctrl->lock, flags);
> +}
> +
> +static void eqbr_gpio_mask_ack_irq(struct irq_data *d)
> +{
> +	eqbr_gpio_disable_irq(d);
> +	eqbr_gpio_ack_irq(d);
> +}
> +
> +static inline void eqbr_cfg_bit(void __iomem *addr,
> +				unsigned int offset, unsigned int set)
> +{
> +	if (set)
> +		writel(readl(addr) | BIT(offset), addr);
> +	else
> +		writel(readl(addr) & ~BIT(offset), addr);
> +}
> +
> +static int eqbr_irq_type_cfg(struct gpio_irq_type *type,
> +			     struct eqbr_gpio_ctrl *gctrl,
> +			     unsigned int offset)
> +{
> +	unsigned long flags;
> +
> +	raw_spin_lock_irqsave(&gctrl->lock, flags);
> +	eqbr_cfg_bit(gctrl->membase + GPIO_IRNCFG, offset, type->trig_type);
> +	eqbr_cfg_bit(gctrl->membase + GPIO_EXINTCR1, offset, type->trig_type);
> +	eqbr_cfg_bit(gctrl->membase + GPIO_EXINTCR0, offset, type->logic_type);
> +	raw_spin_unlock_irqrestore(&gctrl->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int eqbr_gpio_set_irq_type(struct irq_data *d, unsigned int type)
> +{
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc);
> +	unsigned int offset = irqd_to_hwirq(d);
> +	struct gpio_irq_type it;
> +
> +	memset(&it, 0, sizeof(it));
> +
> +	if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE)
> +		return 0;
> +
> +	switch (type) {
> +	case IRQ_TYPE_EDGE_RISING:
> +		it.trig_type = GPIO_EDGE_TRIG;
> +		it.edge_type = GPIO_SINGLE_EDGE;
> +		it.logic_type = GPIO_POSITIVE_TRIG;
> +		break;
> +
> +	case IRQ_TYPE_EDGE_FALLING:
> +		it.trig_type = GPIO_EDGE_TRIG;
> +		it.edge_type = GPIO_SINGLE_EDGE;
> +		it.logic_type = GPIO_NEGATIVE_TRIG;
> +		break;
> +
> +	case IRQ_TYPE_EDGE_BOTH:
> +		it.trig_type = GPIO_EDGE_TRIG;
> +		it.edge_type = GPIO_BOTH_EDGE;
> +		it.logic_type = GPIO_POSITIVE_TRIG;
> +		break;
> +
> +	case IRQ_TYPE_LEVEL_HIGH:
> +		it.trig_type = GPIO_LEVEL_TRIG;
> +		it.edge_type = GPIO_SINGLE_EDGE;
> +		it.logic_type = GPIO_POSITIVE_TRIG;
> +		break;
> +
> +	case IRQ_TYPE_LEVEL_LOW:
> +		it.trig_type = GPIO_LEVEL_TRIG;
> +		it.edge_type = GPIO_SINGLE_EDGE;
> +		it.logic_type = GPIO_NEGATIVE_TRIG;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	eqbr_irq_type_cfg(&it, gctrl, offset);
> +	if (it.trig_type == GPIO_EDGE_TRIG)
> +		irq_set_handler_locked(d, handle_edge_irq);
> +	else
> +		irq_set_handler_locked(d, handle_level_irq);
> +
> +	return 0;
> +}
> +
> +static void eqbr_irq_handler(struct irq_desc *desc)
> +{
> +	struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> +	struct eqbr_gpio_ctrl *gctrl = gpiochip_get_data(gc);
> +	struct irq_chip *ic = irq_desc_get_chip(desc);
> +	unsigned long pins, offset;
> +
> +	chained_irq_enter(ic, desc);
> +	pins = readl(gctrl->membase + GPIO_IRNCR);
> +
> +	for_each_set_bit(offset, &pins, gc->ngpio)
> +		generic_handle_irq(irq_find_mapping(gc->irq.domain, offset));
> +
> +	chained_irq_exit(ic, desc);
> +}
> +
> +static int gpiochip_setup(struct device *dev, struct eqbr_gpio_ctrl *gctrl)
> +{
> +	struct gpio_irq_chip *girq;
> +	struct gpio_chip *gc;
> +
> +	gc = &gctrl->chip;
> +	gc->label = gctrl->name;
> +#if defined(CONFIG_OF_GPIO)
> +	gc->of_node = gctrl->node;
> +#endif
> +
> +	if (!of_property_read_bool(gctrl->node, "interrupt-controller")) {
> +		dev_dbg(dev, "gc %s: doesn't act as interrupt controller!\n",
> +			gctrl->name);
> +		return 0;
> +	}
> +
> +	gctrl->ic.name = "gpio_irq";
> +	gctrl->ic.irq_mask = eqbr_gpio_disable_irq;
> +	gctrl->ic.irq_unmask = eqbr_gpio_enable_irq;
> +	gctrl->ic.irq_ack = eqbr_gpio_ack_irq;
> +	gctrl->ic.irq_mask_ack = eqbr_gpio_mask_ack_irq;
> +	gctrl->ic.irq_set_type = eqbr_gpio_set_irq_type;
> +
> +	girq = &gctrl->chip.irq;
> +	girq->chip = &gctrl->ic;
> +	girq->parent_handler = eqbr_irq_handler;
> +	girq->num_parents = 1;
> +	girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents), GFP_KERNEL);
> +	if (!girq->parents)
> +		return -ENOMEM;
> +
> +	girq->default_type = IRQ_TYPE_NONE;
> +	girq->handler = handle_bad_irq;
> +	girq->parents[0] = gctrl->virq;
> +
> +	return 0;
> +}
> +
> +static int gpiolib_reg(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct eqbr_gpio_ctrl *gctrl;
> +	struct device_node *np;
> +	struct resource res;
> +	int i, ret;
> +
> +	for (i = 0; i < drvdata->nr_gpio_ctrls; i++) {
> +		gctrl = drvdata->gpio_ctrls + i;
> +		np = gctrl->node;
> +
> +		gctrl->name = devm_kasprintf(dev, GFP_KERNEL, "gpiochip%d", i);
> +		if (!gctrl->name)
> +			return -ENOMEM;
> +
> +		if (of_address_to_resource(np, 0, &res)) {
> +			dev_err(dev, "Failed to get GPIO register address\n");
> +			return -ENXIO;
> +		}
> +
> +		gctrl->membase = devm_ioremap_resource(dev, &res);
> +		if (IS_ERR(gctrl->membase))
> +			return PTR_ERR(gctrl->membase);
> +
> +		gctrl->virq = irq_of_parse_and_map(np, 0);
> +		if (!gctrl->virq) {
> +			dev_err(dev, "%s: failed to parse and map irq\n",
> +				gctrl->name);
> +			return -ENXIO;
> +		}
> +		raw_spin_lock_init(&gctrl->lock);
> +
> +		ret = bgpio_init(&gctrl->chip, dev, gctrl->bank->nr_pins / 8,
> +				 gctrl->membase + GPIO_IN,
> +				 gctrl->membase + GPIO_OUTSET,
> +				 gctrl->membase + GPIO_OUTCLR,
> +				 gctrl->membase + GPIO_DIR,
> +				 NULL, 0);
> +		if (ret) {
> +			dev_err(dev, "unable to init generic GPIO\n");
> +			return ret;
> +		}
> +
> +		ret = gpiochip_setup(dev, gctrl);
> +		if (ret)
> +			return ret;
> +
> +		ret = devm_gpiochip_add_data(dev, &gctrl->chip, gctrl);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline struct eqbr_pin_bank
> +*find_pinbank_via_pin(struct eqbr_pinctrl_drv_data *pctl, unsigned int pin)
> +{
> +	struct eqbr_pin_bank *bank;
> +	int i;
> +
> +	for (i = 0; i < pctl->nr_banks; i++) {
> +		bank = &pctl->pin_banks[i];
> +		if (pin >= bank->pin_base &&
> +		    (pin - bank->pin_base) < bank->nr_pins)
> +			return bank;
> +	}
> +
> +	return NULL;
> +}
> +
> +static const struct pinctrl_ops eqbr_pctl_ops = {
> +	.get_groups_count	= pinctrl_generic_get_group_count,
> +	.get_group_name		= pinctrl_generic_get_group_name,
> +	.get_group_pins		= pinctrl_generic_get_group_pins,
> +	.dt_node_to_map		= pinconf_generic_dt_node_to_map_all,
> +	.dt_free_map		= pinconf_generic_dt_free_map,
> +};
> +
> +static int eqbr_set_pin_mux(struct eqbr_pinctrl_drv_data *pctl,
> +			    unsigned int pmx, unsigned int pin)
> +{
> +	struct eqbr_pin_bank *bank;
> +	unsigned long flags;
> +	unsigned int offset;
> +	void __iomem *mem;
> +
> +	bank = find_pinbank_via_pin(pctl, pin);
> +	if (!bank) {
> +		dev_err(pctl->dev, "Couldn't find pin bank for pin %u\n", pin);
> +		return -ENODEV;
> +	}
> +	mem = bank->membase;
> +	offset = pin - bank->pin_base;
> +
> +	if (!(bank->aval_pinmap & BIT(offset))) {
> +		dev_err(pctl->dev,
> +			"PIN: %u is not valid, pinbase: %u, bitmap: %u\n",
> +			pin, bank->pin_base, bank->aval_pinmap);
> +		return -ENODEV;
> +	}
> +
> +	raw_spin_lock_irqsave(&pctl->lock, flags);
> +	writel(pmx, mem + (offset * 4));
> +	raw_spin_unlock_irqrestore(&pctl->lock, flags);
> +	return 0;
> +}
> +
> +static int eqbr_pinmux_set_mux(struct pinctrl_dev *pctldev,
> +			       unsigned int selector, unsigned int group)
> +{
> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
> +	struct function_desc *func;
> +	struct group_desc *grp;
> +	unsigned int *pinmux;
> +	int i;
> +
> +	func = pinmux_generic_get_function(pctldev, selector);
> +	if (!func)
> +		return -EINVAL;
> +
> +	grp = pinctrl_generic_get_group(pctldev, group);
> +	if (!grp)
> +		return -EINVAL;
> +
> +	pinmux = grp->data;
> +	for (i = 0; i < grp->num_pins; i++)
> +		eqbr_set_pin_mux(pctl, pinmux[i], grp->pins[i]);
> +
> +	return 0;
> +}
> +
> +static int eqbr_pinmux_gpio_request(struct pinctrl_dev *pctldev,
> +				    struct pinctrl_gpio_range *range,
> +				    unsigned int pin)
> +{
> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
> +
> +	return eqbr_set_pin_mux(pctl, EQBR_GPIO_MODE, pin);
> +}
> +
> +static const struct pinmux_ops eqbr_pinmux_ops = {
> +	.get_functions_count	= pinmux_generic_get_function_count,
> +	.get_function_name	= pinmux_generic_get_function_name,
> +	.get_function_groups	= pinmux_generic_get_function_groups,
> +	.set_mux		= eqbr_pinmux_set_mux,
> +	.gpio_request_enable	= eqbr_pinmux_gpio_request,
> +	.strict			= true,
> +};
> +
> +static int get_drv_cur(void __iomem *mem, unsigned int offset)
> +{
> +	unsigned int idx = offset / DRV_CUR_PINS; /* 0-15, 16-31 per register*/
> +	unsigned int pin_offset = offset % DRV_CUR_PINS;
> +
> +	return PARSE_DRV_CURRENT(readl(mem + REG_DRCC(idx)), pin_offset);
> +}
> +
> +static struct eqbr_gpio_ctrl
> +*get_gpio_ctrls_via_bank(struct eqbr_pinctrl_drv_data *pctl,
> +			struct eqbr_pin_bank *bank)
> +{
> +	int i;
> +
> +	for (i = 0; i < pctl->nr_gpio_ctrls; i++) {
> +		if (pctl->gpio_ctrls[i].bank == bank)
> +			return &pctl->gpio_ctrls[i];
> +	}
> +
> +	return NULL;
> +}
> +
> +static int eqbr_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
> +			    unsigned long *config)
> +{
> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
> +	enum pin_config_param param = pinconf_to_config_param(*config);
> +	struct eqbr_gpio_ctrl *gctrl;
> +	struct eqbr_pin_bank *bank;
> +	unsigned long flags;
> +	unsigned int offset;
> +	void __iomem *mem;
> +	u32 val;
> +
> +	bank = find_pinbank_via_pin(pctl, pin);
> +	if (!bank) {
> +		dev_err(pctl->dev, "Couldn't find pin bank for pin %u\n", pin);
> +		return -ENODEV;
> +	}
> +	mem = bank->membase;
> +	offset = pin - bank->pin_base;
> +
> +	if (!(bank->aval_pinmap & BIT(offset))) {
> +		dev_err(pctl->dev,
> +			"PIN: %u is not valid, pinbase: %u, bitmap: %u\n",
> +			pin, bank->pin_base, bank->aval_pinmap);
> +		return -ENODEV;
> +	}
> +
> +	raw_spin_lock_irqsave(&pctl->lock, flags);
> +	switch (param) {
> +	case PIN_CONFIG_BIAS_PULL_UP:
> +		val = !!(readl(mem + REG_PUEN) & BIT(offset));
> +		break;
> +	case PIN_CONFIG_BIAS_PULL_DOWN:
> +		val = !!(readl(mem + REG_PDEN) & BIT(offset));
> +		break;
> +	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
> +		val = !!(readl(mem + REG_OD) & BIT(offset));
> +		break;
> +	case PIN_CONFIG_DRIVE_STRENGTH:
> +		val = get_drv_cur(mem, offset);
> +		break;
> +	case PIN_CONFIG_SLEW_RATE:
> +		val = !!(readl(mem + REG_SRC) & BIT(offset));
> +		break;
> +	case PIN_CONFIG_OUTPUT_ENABLE:
> +		gctrl = get_gpio_ctrls_via_bank(pctl, bank);
> +		if (!gctrl) {
> +			dev_err(pctl->dev, "Failed to find gpio via bank pinbase: %u, pin: %u\n",
> +				bank->pin_base, pin);
> +			raw_spin_unlock_irqrestore(&pctl->lock, flags);
> +			return -ENODEV;
> +		}
> +		val = !!(readl(gctrl->membase + GPIO_DIR) & BIT(offset));
> +		break;
> +	default:
> +		raw_spin_unlock_irqrestore(&pctl->lock, flags);
> +		return -ENOTSUPP;
> +	}
> +	raw_spin_unlock_irqrestore(&pctl->lock, flags);
> +	*config = pinconf_to_config_packed(param, val);
> +;
> +	return 0;
> +}
> +
> +static int eqbr_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
> +			    unsigned long *configs, unsigned int num_configs)
> +{
> +	struct eqbr_pinctrl_drv_data *pctl = pinctrl_dev_get_drvdata(pctldev);
> +	struct eqbr_gpio_ctrl *gctrl;
> +	enum pin_config_param param;
> +	struct eqbr_pin_bank *bank;
> +	unsigned int val, offset;
> +	struct gpio_chip *gc;
> +	unsigned long flags;
> +	void __iomem *mem;
> +	u32 regval, mask;
> +	int i;
> +
> +	for (i = 0; i < num_configs; i++) {
> +		param = pinconf_to_config_param(configs[i]);
> +		val = pinconf_to_config_argument(configs[i]);
> +
> +		bank = find_pinbank_via_pin(pctl, pin);
> +		if (!bank) {
> +			dev_err(pctl->dev,
> +				"Couldn't find pin bank for pin %u\n", pin);
> +			return -ENODEV;
> +		}
> +		mem = bank->membase;
> +		offset = pin - bank->pin_base;
> +
> +		switch (param) {
> +		case PIN_CONFIG_BIAS_PULL_UP:
> +			mem += REG_PUEN;
> +			mask = BIT(offset);
> +			break;
> +		case PIN_CONFIG_BIAS_PULL_DOWN:
> +			mem += REG_PDEN;
> +			mask = BIT(offset);
> +			break;
> +		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
> +			mem += REG_OD;
> +			mask = BIT(offset);
> +			break;
> +		case PIN_CONFIG_DRIVE_STRENGTH:
> +			mem += REG_DRCC(offset / DRV_CUR_PINS);
> +			offset = (offset % DRV_CUR_PINS) * 2;
> +			mask = GENMASK(1, 0) << offset;
> +			break;
> +		case PIN_CONFIG_SLEW_RATE:
> +			mem += REG_SRC;
> +			mask = BIT(offset);
> +			break;
> +		case PIN_CONFIG_OUTPUT_ENABLE:
> +			gctrl = get_gpio_ctrls_via_bank(pctl, bank);
> +			if (!gctrl) {
> +				dev_err(pctl->dev, "Failed to find gpio via bank pinbase: %u, pin: %u\n",
> +					bank->pin_base, pin);
> +				return -ENODEV;
> +			}
> +			gc = &gctrl->chip;
> +			gc->direction_output(gc, offset, 0);
> +			continue;
> +		default:
> +			return -ENOTSUPP;
> +		}
> +
> +		raw_spin_lock_irqsave(&pctl->lock, flags);
> +		regval = readl(mem);
> +		regval = (regval & ~mask) | ((val << offset) & mask);
> +		writel(regval, mem);
> +		raw_spin_unlock_irqrestore(&pctl->lock, flags);
> +	}
> +
> +	return 0;
> +}
> +
> +static int eqbr_pinconf_group_get(struct pinctrl_dev *pctldev,
> +				  unsigned int group, unsigned long *config)
> +{
> +	unsigned int i, npins, old = 0;
> +	const unsigned int *pins;
> +	int ret;
> +
> +	ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < npins; i++) {
> +		if (eqbr_pinconf_get(pctldev, pins[i], config))
> +			return -ENOTSUPP;
> +
> +		if (i && old != *config)
> +			return -ENOTSUPP;
> +
> +		old = *config;
> +	}
> +	return 0;
> +}
> +
> +static int eqbr_pinconf_group_set(struct pinctrl_dev *pctldev,
> +				  unsigned int group, unsigned long *configs,
> +				  unsigned int num_configs)
> +{
> +	const unsigned int *pins;
> +	unsigned int i, npins;
> +	int ret;
> +
> +	ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < npins; i++) {
> +		ret = eqbr_pinconf_set(pctldev, pins[i], configs, num_configs);
> +		if (ret)
> +			return ret;
> +	}
> +	return 0;
> +}
> +
> +static const struct pinconf_ops eqbr_pinconf_ops = {
> +	.is_generic			= true,
> +	.pin_config_get			= eqbr_pinconf_get,
> +	.pin_config_set			= eqbr_pinconf_set,
> +	.pin_config_group_get		= eqbr_pinconf_group_get,
> +	.pin_config_group_set		= eqbr_pinconf_group_set,
> +	.pin_config_config_dbg_show	= pinconf_generic_dump_config,
> +};
> +
> +static bool is_func_exist(struct eqbr_pmx_func *funcs, const char *name,
> +			 unsigned int nr_funcs, unsigned int *idx)
> +{
> +	int i;
> +
> +	if (!funcs)
> +		return false;
> +
> +	for (i = 0; i < nr_funcs; i++) {
> +		if (funcs[i].name && !strcmp(funcs[i].name, name)) {
> +			*idx = i;
> +			return true;
> +		}
> +	}
> +
> +	return false;
> +}
> +
> +static int funcs_utils(struct device *dev, struct eqbr_pmx_func *funcs,
> +		       unsigned int *nr_funcs, funcs_util_ops op)
> +{
> +	struct device_node *node = dev->of_node;
> +	struct device_node *np;
> +	struct property *prop;
> +	const char *fn_name;
> +	unsigned int fid;
> +	int i, j;
> +
> +	i = 0;
> +	for_each_child_of_node(node, np) {
> +		prop = of_find_property(np, "groups", NULL);
> +		if (!prop)
> +			continue;
> +
> +		if (of_property_read_string(np, "function", &fn_name)) {
> +			/* some groups may not have function, it's OK */
> +			dev_dbg(dev, "Group %s: not function binded!\n",
> +				(char *)prop->value);
> +			continue;
> +		}
> +
> +		switch (op) {
> +		case OP_COUNT_NR_FUNCS:
> +			if (!is_func_exist(funcs, fn_name, *nr_funcs, &fid))
> +				*nr_funcs = *nr_funcs + 1;
> +			break;
> +
> +		case OP_ADD_FUNCS:
> +			if (!is_func_exist(funcs, fn_name, *nr_funcs, &fid))
> +				funcs[i].name = fn_name;
> +			break;
> +
> +		case OP_COUNT_NR_FUNC_GRPS:
> +			if (is_func_exist(funcs, fn_name, *nr_funcs, &fid))
> +				funcs[fid].nr_groups++;
> +			break;
> +
> +		case OP_ADD_FUNC_GRPS:
> +			if (is_func_exist(funcs, fn_name, *nr_funcs, &fid)) {
> +				for (j = 0; j < funcs[fid].nr_groups; j++)
> +					if (!funcs[fid].groups[j])
> +						break;
> +				funcs[fid].groups[j] = prop->value;
> +			}
> +			break;
> +
> +		default:
> +				return -EINVAL;
> +		}
> +		i++;
> +	}
> +
> +	return 0;
> +}
> +
> +static int eqbr_build_functions(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct eqbr_pmx_func *funcs = NULL;
> +	unsigned int nr_funcs = 0;
> +	int i, ret;
> +
> +	ret = funcs_utils(dev, funcs, &nr_funcs, OP_COUNT_NR_FUNCS);
> +	if (ret)
> +		return ret;
> +
> +	funcs = devm_kcalloc(dev, nr_funcs, sizeof(*funcs), GFP_KERNEL);
> +	if (!funcs)
> +		return -ENOMEM;
> +
> +	ret = funcs_utils(dev, funcs, &nr_funcs, OP_ADD_FUNCS);
> +	if (ret)
> +		return ret;
> +
> +	ret = funcs_utils(dev, funcs, &nr_funcs, OP_COUNT_NR_FUNC_GRPS);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < nr_funcs; i++) {
> +		if (!funcs[i].nr_groups)
> +			continue;
> +		funcs[i].groups = devm_kcalloc(dev, funcs[i].nr_groups,
> +					       sizeof(*(funcs[i].groups)),
> +					       GFP_KERNEL);
> +		if (!funcs[i].groups)
> +			return -ENOMEM;
> +	}
> +
> +	ret = funcs_utils(dev, funcs, &nr_funcs, OP_ADD_FUNC_GRPS);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < nr_funcs; i++) {
> +		ret = pinmux_generic_add_function(drvdata->pctl_dev,
> +						  funcs[i].name,
> +						  funcs[i].groups,
> +						  funcs[i].nr_groups,
> +						  drvdata);
> +		if (ret < 0) {
> +			dev_err(dev, "Failed to register function %s\n",
> +				funcs[i].name);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int eqbr_build_groups(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct device_node *node = dev->of_node;
> +	unsigned int *pinmux, pin_id, pinmux_id;
> +	struct group_desc group;
> +	struct device_node *np;
> +	struct property *prop;
> +	int j, err;
> +
> +	for_each_child_of_node(node, np) {
> +		prop = of_find_property(np, "groups", NULL);
> +		if (!prop)
> +			continue;
> +
> +		group.num_pins = of_property_count_u32_elems(np, "pins");
> +		if (group.num_pins < 0) {
> +			dev_err(dev, "No pins in the group: %s\n", prop->name);
> +			return -EINVAL;
> +		}
> +		group.name = prop->value;
> +		group.pins = devm_kcalloc(dev, group.num_pins,
> +					  sizeof(*(group.pins)), GFP_KERNEL);
> +		if (!group.pins)
> +			return -ENOMEM;
> +
> +		pinmux = devm_kcalloc(dev, group.num_pins, sizeof(*pinmux),
> +				      GFP_KERNEL);
> +		if (!pinmux)
> +			return -ENOMEM;
> +
> +		for (j = 0; j < group.num_pins; j++) {
> +			if (of_property_read_u32_index(np, "pins", j, &pin_id)) {
> +				dev_err(dev, "Group %s: Read intel pins id failed\n",
> +					group.name);
> +				return -EINVAL;
> +			}
> +			if (pin_id >= drvdata->pctl_desc.npins) {
> +				dev_err(dev, "Group %s: Invalid pin ID, idx: %d, pin %u\n",
> +					group.name, j, pin_id);
> +				return -EINVAL;
> +			}
> +			group.pins[j] = pin_id;
> +			if (of_property_read_u32_index(np, "pinmux", j, &pinmux_id)) {
> +				dev_err(dev, "Group %s: Read intel pinmux id failed\n",
> +					group.name);
> +				return -EINVAL;
> +			}
> +			pinmux[j] = pinmux_id;
> +		}
> +
> +		err = pinctrl_generic_add_group(drvdata->pctl_dev, group.name,
> +						group.pins, group.num_pins,
> +						pinmux);
> +		if (err < 0) {
> +			dev_err(dev, "Failed to register group %s\n", group.name);
> +			return err;
> +		}
> +		memset(&group, 0, sizeof(group));
> +		pinmux = NULL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int pinctrl_reg(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct pinctrl_desc *pctl_desc;
> +	struct pinctrl_pin_desc *pdesc;
> +	struct device *dev;
> +	unsigned int nr_pins;
> +	char *pin_names;
> +	int i, ret;
> +
> +	dev = drvdata->dev;
> +	pctl_desc = &drvdata->pctl_desc;
> +	pctl_desc->name = "eqbr-pinctrl";
> +	pctl_desc->owner = THIS_MODULE;
> +	pctl_desc->pctlops = &eqbr_pctl_ops;
> +	pctl_desc->pmxops = &eqbr_pinmux_ops;
> +	pctl_desc->confops = &eqbr_pinconf_ops;
> +	raw_spin_lock_init(&drvdata->lock);
> +
> +	for (i = 0, nr_pins = 0; i < drvdata->nr_banks; i++)
> +		nr_pins += drvdata->pin_banks[i].nr_pins;
> +
> +	pdesc = devm_kcalloc(dev, nr_pins, sizeof(*pdesc), GFP_KERNEL);
> +	if (!pdesc)
> +		return -ENOMEM;
> +	pin_names = devm_kcalloc(dev, nr_pins, PIN_NAME_LEN, GFP_KERNEL);
> +	if (!pin_names)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < nr_pins; i++) {
> +		sprintf(pin_names, PIN_NAME_FMT, i);
> +		pdesc[i].number = i;
> +		pdesc[i].name = pin_names;
> +		pin_names += PIN_NAME_LEN;
> +	}
> +	pctl_desc->pins = pdesc;
> +	pctl_desc->npins = nr_pins;
> +	dev_dbg(dev, "pinctrl total pin number: %u\n", nr_pins);
> +
> +	ret = devm_pinctrl_register_and_init(dev, pctl_desc, drvdata,
> +					     &drvdata->pctl_dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = eqbr_build_groups(drvdata);
> +	if (ret) {
> +		dev_err(dev, "Failed to build groups\n");
> +		return ret;
> +	}
> +
> +	ret = eqbr_build_functions(drvdata);
> +	if (ret) {
> +		dev_err(dev, "Failed to build groups\n");
> +		return ret;
> +	}
> +
> +	return pinctrl_enable(drvdata->pctl_dev);
> +}
> +
> +static int pinbank_init(struct device_node *np,
> +			struct eqbr_pinctrl_drv_data *drvdata,
> +			struct eqbr_pin_bank *bank, unsigned int id)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct of_phandle_args spec;
> +	int ret;
> +
> +	bank->membase = drvdata->membase + id * PAD_REG_OFF;
> +
> +	ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &spec);
> +	if (ret) {
> +		dev_err(dev, "gpio-range not available!\n");
> +		return ret;
> +	}
> +
> +	bank->pin_base = spec.args[1];
> +	bank->nr_pins = spec.args[2];
> +
> +	bank->aval_pinmap = readl(bank->membase + REG_AVAIL);
> +	bank->id = id;
> +
> +	dev_dbg(dev, "pinbank id: %d, reg: %px, pinbase: %u, pin number: %u, pinmap: 0x%x\n",
> +		id, bank->membase, bank->pin_base,
> +		bank->nr_pins, bank->aval_pinmap);
> +
> +	return ret;
> +}
> +
> +static int pinbank_probe(struct eqbr_pinctrl_drv_data *drvdata)
> +{
> +	struct device *dev = drvdata->dev;
> +	struct device_node *np_gpio;
> +	struct eqbr_gpio_ctrl *gctrls;
> +	struct eqbr_pin_bank *banks;
> +	int i, nr_gpio;
> +
> +	/* Count gpio bank number */
> +	nr_gpio = 0;
> +	for_each_node_by_name(np_gpio, "gpio") {
> +		if (of_device_is_available(np_gpio))
> +			nr_gpio++;
> +	}
> +
> +	if (!nr_gpio) {
> +		dev_err(dev, "NO pin bank available!\n");
> +		return -ENODEV;
> +	}
> +
> +	/* Count pin bank number and gpio controller number */
> +	banks = devm_kcalloc(dev, nr_gpio, sizeof(*banks), GFP_KERNEL);
> +	if (!banks)
> +		return -ENOMEM;
> +
> +	gctrls = devm_kcalloc(dev, nr_gpio, sizeof(*gctrls), GFP_KERNEL);
> +	if (!gctrls)
> +		return -ENOMEM;
> +
> +	dev_dbg(dev, "found %d gpio controller!\n", nr_gpio);
> +
> +	/* Initialize Pin bank */
> +	i = 0;
> +	for_each_node_by_name(np_gpio, "gpio") {
> +		if (!of_device_is_available(np_gpio))
> +			continue;
> +
> +		pinbank_init(np_gpio, drvdata, banks + i, i);
> +
> +		gctrls[i].node = np_gpio;
> +		gctrls[i].bank = banks + i;
> +		i++;
> +	}
> +
> +	drvdata->pin_banks = banks;
> +	drvdata->nr_banks = nr_gpio;
> +	drvdata->gpio_ctrls = gctrls;
> +	drvdata->nr_gpio_ctrls = nr_gpio;
> +
> +	return 0;
> +}
> +
> +static int eqbr_pinctrl_probe(struct platform_device *pdev)
> +{
> +	struct eqbr_pinctrl_drv_data *drvdata;
> +	struct device *dev = &pdev->dev;
> +	int ret;
> +
> +	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> +	if (!drvdata)
> +		return -ENOMEM;
> +
> +	drvdata->dev = dev;
> +
> +	drvdata->membase = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(drvdata->membase))
> +		return PTR_ERR(drvdata->membase);
> +
> +	ret = pinbank_probe(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	ret = pinctrl_reg(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	ret = gpiolib_reg(drvdata);
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, drvdata);
> +	return 0;
> +}
> +
> +static const struct of_device_id eqbr_pinctrl_dt_match[] = {
> +	{ .compatible = "intel,lightning-mountain-io" },
> +	{}
> +};
> +
> +static struct platform_driver eqbr_pinctrl_driver = {
> +	.probe	= eqbr_pinctrl_probe,
> +	.driver = {
> +		.name = "eqbr-pinctrl",
> +		.of_match_table = eqbr_pinctrl_dt_match,
> +	},
> +};
> +
> +module_platform_driver(eqbr_pinctrl_driver);
> +
> +MODULE_AUTHOR("Zhu Yixin <yixin.zhu@...el.com>, Rahul Tanwar <rahul.tanwar@...el.com>");
> +MODULE_DESCRIPTION("Pinctrl Driver for LGM SoC (Equilibrium)");
> diff --git a/drivers/pinctrl/pinctrl-equilibrium.h b/drivers/pinctrl/pinctrl-equilibrium.h
> new file mode 100644
> index 000000000000..83cb7dafc657
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-equilibrium.h
> @@ -0,0 +1,144 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + *  Copyright(c) 2019 Intel Corporation.
> + */
> +
> +#ifndef __PINCTRL_EQUILIBRIUM_H
> +#define __PINCTRL_EQUILIBRIUM_H
> +
> +/* PINPAD register offset */
> +#define REG_PMX_BASE	0x0	/* Port Multiplexer Control Register */
> +#define REG_PUEN	0x80	/* PULL UP Enable Register */
> +#define REG_PDEN	0x84	/* PULL DOWN Enable Register */
> +#define REG_SRC		0x88	/* Slew Rate Control Register */
> +#define REG_DCC0	0x8C	/* Drive Current Control Register 0 */
> +#define REG_DCC1	0x90	/* Drive Current Control Register 1 */
> +#define REG_OD		0x94	/* Open Drain Enable Register */
> +#define REG_AVAIL	0x98	/* Pad Control Availability Register */
> +#define DRV_CUR_PINS	16	/* Drive Current pin number per register */
> +#define REG_DRCC(x)	(REG_DCC0 + (x) * 4) /* Driver current macro */
> +
> +/* GPIO register offset */
> +#define GPIO_OUT	0x0	/* Data Output Register */
> +#define GPIO_IN		0x4	/* Data Input Register */
> +#define GPIO_DIR	0x8	/* Direction Register */
> +#define GPIO_EXINTCR0	0x18	/* External Interrupt Control Register 0 */
> +#define GPIO_EXINTCR1	0x1C	/* External Interrupt Control Register 1 */
> +#define GPIO_IRNCR	0x20	/* IRN Capture Register */
> +#define GPIO_IRNICR	0x24	/* IRN Interrupt Control Register */
> +#define GPIO_IRNEN	0x28	/* IRN Interrupt Enable Register */
> +#define GPIO_IRNCFG	0x2C	/* IRN Interrupt Configuration Register */
> +#define GPIO_IRNRNSET	0x30	/* IRN Interrupt Enable Set Register */
> +#define GPIO_IRNENCLR	0x34	/* IRN Interrupt Enable Clear Register */
> +#define GPIO_OUTSET	0x40	/* Output Set Register */
> +#define GPIO_OUTCLR	0x44	/* Output Clear Register */
> +#define GPIO_DIRSET	0x48	/* Direction Set Register */
> +#define GPIO_DIRCLR	0x4C	/* Direction Clear Register */
> +
> +/* parse given pin's driver current value */
> +#define PARSE_DRV_CURRENT(val, pin) (((val) >> ((pin) * 2)) & 0x3)
> +
> +#define GPIO_EDGE_TRIG		0
> +#define GPIO_LEVEL_TRIG		1
> +#define GPIO_SINGLE_EDGE	0
> +#define GPIO_BOTH_EDGE		1
> +#define GPIO_POSITIVE_TRIG	0
> +#define GPIO_NEGATIVE_TRIG	1
> +
> +#define EQBR_GPIO_MODE		0
> +
> +typedef enum {
> +	OP_COUNT_NR_FUNCS,
> +	OP_ADD_FUNCS,
> +	OP_COUNT_NR_FUNC_GRPS,
> +	OP_ADD_FUNC_GRPS,
> +	OP_NONE,
> +} funcs_util_ops;
> +
> +/**
> + * struct gpio_irq_type: gpio irq configuration
> + * @trig_type: level trigger or edge trigger
> + * @edge_type: sigle edge or both edge
> + * @logic_type: positive trigger or negative trigger
> + */
> +struct gpio_irq_type {
> +	unsigned int trig_type;
> +	unsigned int edge_type;
> +	unsigned int logic_type;
> +};
> +
> +/**
> + * struct eqbr_pmx_func: represent a pin function.
> + * @name: name of the pin function, used to lookup the function.
> + * @groups: one or more names of pin groups that provide this function.
> + * @nr_groups: number of groups included in @groups.
> + */
> +struct eqbr_pmx_func {
> +	const char		*name;
> +	const char		**groups;
> +	unsigned int		nr_groups;
> +};
> +
> +/**
> + * struct eqbr_pin_bank: represent a pin bank.
> + * @membase: base address of the pin bank register.
> + * @id: bank id, to idenify the unique bank.
> + * @pin_base: starting pin number of the pin bank.
> + * @nr_pins: number of the pins of the pin bank.
> + * @aval_pinmap: available pin bitmap of the pin bank.
> + */
> +struct eqbr_pin_bank {
> +	void __iomem		*membase;
> +	unsigned int		id;
> +	unsigned int		pin_base;
> +	unsigned int		nr_pins;
> +	u32			aval_pinmap;
> +};
> +
> +/**
> + * struct eqbr_gpio_ctrl: represent a gpio controller.
> + * @node: device node of gpio controller.
> + * @bank: pointer to corresponding pin bank.
> + * @membase: base address of the gpio controller.
> + * @chip: gpio chip.
> + * @ic:   irq chip.
> + * @name: gpio chip name.
> + * @virq: irq number of the gpio chip to parent's irq domain.
> + * @lock: spin lock to protect gpio register write.
> + */
> +struct eqbr_gpio_ctrl {
> +	struct device_node	*node;
> +	struct eqbr_pin_bank	*bank;
> +	void __iomem		*membase;
> +	struct gpio_chip	chip;
> +	struct irq_chip		ic;
> +	const char		*name;
> +	unsigned int		virq;
> +	raw_spinlock_t		lock; /* protect gpio register */
> +};
> +
> +/**
> + * struct eqbr_pinctrl_drv_data:
> + * @dev: device instance representing the controller.
> + * @pctl_desc: pin controller descriptor.
> + * @pctl_dev: pin control class device
> + * @membase: base address of pin controller
> + * @pin_banks: list of pin banks of the driver.
> + * @nr_banks: number of pin banks.
> + * @gpio_ctrls: list of gpio controllers.
> + * @nr_gpio_ctrls: number of gpio controllers.
> + * @lock: protect pinctrl register write
> + */
> +struct eqbr_pinctrl_drv_data {
> +	struct device			*dev;
> +	struct pinctrl_desc		pctl_desc;
> +	struct pinctrl_dev		*pctl_dev;
> +	void __iomem			*membase;
> +	struct eqbr_pin_bank		*pin_banks;
> +	unsigned int			nr_banks;
> +	struct eqbr_gpio_ctrl		*gpio_ctrls;
> +	unsigned int			nr_gpio_ctrls;
> +	raw_spinlock_t			lock; /* protect pinpad register */
> +};
> +
> +#endif /* __PINCTRL_EQUILIBRIUM_H */
> -- 
> 2.11.0
> 

-- 
With Best Regards,
Andy Shevchenko

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